{"id":240,"date":"2021-05-26T13:47:31","date_gmt":"2021-05-26T13:47:31","guid":{"rendered":"https:\/\/www.siekmann-rohrbogen.de\/pipe-bends\/"},"modified":"2026-10-30T10:31:27","modified_gmt":"2026-10-30T10:31:27","slug":"pipe-bends","status":"publish","type":"page","link":"https:\/\/www.siekmann-rohrbogen.de\/en\/","title":{"rendered":"Elbow made from seamless pipe"},"content":{"rendered":"\n<!-- Siekmann Startseite NEUES DESIGN (EN) \u2013 Block \"Individuelles HTML\". 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.marquee{overflow:hidden;margin-top:1.8rem;-webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}\n#skr .marquee-track{display:flex;gap:1rem;width:max-content;animation:skrScroll 40s linear infinite;list-style:none;margin:0;padding:.4rem 0 1rem}\n#skr .marquee:hover .marquee-track{animation-play-state:paused}\n#skr .marquee-track li{background:#fff;border:1px solid var(--border);border-radius:999px;padding:.7rem 1.5rem;font-weight:700;color:var(--blau-dunkel);white-space:nowrap;box-shadow:var(--shadow);margin:0}\n@keyframes skrScroll{to{transform:translateX(-50%)}}\n\/* Abschluss-CTA *\/\n#skr .cta{background:linear-gradient(135deg,var(--blau-dunkel),var(--blau));color:#fff;text-align:center;border-radius:var(--radius);padding:clamp(40px,6vw,64px) clamp(24px,5vw,48px)}\n#skr .cta h2{color:#fff}\n#skr .cta p{color:#cfe2f7;max-width:620px;margin:0 auto 1.6rem}\n#skr .cta .btns{justify-content:center}\n\/* Einblend-Animation *\/\n#skr.js .reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}\n#skr.js .reveal.in{opacity:1;transform:none}\n\/* Responsiv *\/\n@media (max-width:1024px){#skr .hero-grid{grid-template-columns:1fr}#skr .hero-visual{max-width:560px}#skr .arc-svg{display:none}}\n@media (max-width:768px){\n#skr .stats{grid-template-columns:repeat(2,1fr)}\n#skr .grid-2{grid-template-columns:1fr}\n#skr .gallery{grid-template-columns:1fr 1fr}\n#skr .bauart-demo{grid-template-columns:1fr;justify-items:center;text-align:center}\n#skr .bauart-info .tabs{justify-content:center}\n#skr .calc-fields{grid-template-columns:1fr}\n#skr .wall-row{grid-template-columns:1fr;gap:.35rem}\n#skr .swipe-hint{display:block}\n#skr table{font-size:12px}\n#skr th,#skr td{padding:.4rem .45rem}\n#skr .spec-table th{width:40%}\n}\n@media (max-width:480px){#skr .gallery{grid-template-columns:1fr}}\n@media (prefers-reduced-motion:reduce){#skr *,#skr *::before,#skr *::after{animation:none!important;transition:none!important}#skr.js .reveal{opacity:1;transform:none}#skr .arc-path{stroke-dashoffset:0}#skr .arc-tick{opacity:.9}}\n<\/style>\n<div id=\"skr\" lang=\"en\" data-dec=\".\"><section class=\"hero\"><svg class=\"arc-svg\" viewBox=\"0 0 600 500\" aria-hidden=\"true\" focusable=\"false\"><path class=\"arc-path\" d=\"M 80 460 A 380 380 0 0 1 460 80\"\/><text class=\"arc-tick\" x=\"60\" y=\"485\" style=\"animation-delay:.6s\">0\u00b0<\/text><text class=\"arc-tick\" x=\"150\" y=\"205\" style=\"animation-delay:1.4s\">45\u00b0<\/text><text class=\"arc-tick\" x=\"470\" y=\"70\" style=\"animation-delay:2.4s\">90\u00b0<\/text><\/svg><div class=\"wrap hero-grid\"><div><p class=\"kicker\">special.elbow.production. \u2014 B\u00fcnde, Germany<\/p><h1>Pipe bends direct from the manufacturer \u2013 <em lang=\"de\">Siekmann<\/em><\/h1><p>Seamless, heavy-wall special pipe bends in carbon steel and stainless steel. Manufactured to EN&nbsp;10253, DIN&nbsp;2605 and ASME&nbsp;B16.9.<\/p><ul class=\"hero-badges\"><li>EN 10253<\/li><li>DIN 2605<\/li><li>ASME B16.9<\/li><li>ISO 9001:2015 \u00b7 T\u00dcV Nord<\/li><\/ul><div class=\"btns\"><a class=\"btn btn-white\" href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/contact\/\">Request a quote \u2192<\/a><a class=\"btn btn-ghost\" href=\"#lieferprogramm\">Product range<\/a><\/div><\/div><figure class=\"hero-visual\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/09\/K1600_IMG_7675.jpg\" alt=\"Heavy-wall seamless pipe bend 114.3 \u00d7 12.5 mm, Type B, 3D\" width=\"1024\" height=\"683\" fetchpriority=\"high\"><\/figure><\/div><div class=\"wrap\"><dl class=\"stats\" aria-label=\"Key data of the product range\"><div class=\"stat\"><dt>Outside diameter<\/dt><dd>13.7 \u2013 219.1 mm<\/dd><\/div><div class=\"stat\"><dt>Wall thickness<\/dt><dd>1 \u2013 55 mm<\/dd><\/div><div class=\"stat\"><dt>Bending radius tolerance<\/dt><dd>down to \u00b11 mm<\/dd><\/div><div class=\"stat\"><dt>Certified<\/dt><dd>ISO 9001:2015 \u00b7 T\u00dcV Nord<\/dd><\/div><\/dl><\/div><\/section><section id=\"lieferprogramm\"><div class=\"wrap\"><div class=\"reveal\"><p class=\"eyebrow\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/05\/rohrbogen_apple.png\" alt=\"\" width=\"18\" height=\"18\" loading=\"lazy\">Product range<\/p><h2>Seamless. Heavy-wall. Even in small batches.<\/h2><p class=\"lead\"><strong>Siekmann GmbH &amp; Co. KG<\/strong> is your reliable partner for <strong>pipe bends made from seamless pipe<\/strong> \u2013 manufactured in Germany.<\/p><p style=\"max-width:760px\">We process <strong>carbon steel<\/strong> and <strong>stainless steel<\/strong> and specialise in <strong>heavy-wall butt-weld pipe bends<\/strong> and <strong>special pipe bends<\/strong>. Our strength is precise forming \u2013 even for small quantities and short delivery times. As a manufacturer we keep our own stock of blanks, so we can deliver single items at short notice.<\/p><\/div><div class=\"grid-2 top reveal\" style=\"margin-top:1.6rem\"><div><h3>Our product range at a glance<\/h3><ul class=\"check-list\"><li>Seamless <strong>pipe bends<\/strong> with heavy wall thicknesses<\/li><li>Special radii and pipe bends with tight tolerances<\/li><li>Carbon steel, high-alloy materials and stainless steel<\/li><li><strong>45\u00b0, 90\u00b0 and 180\u00b0 pipe bends<\/strong> \u2013 intermediate angles also possible<\/li><li><strong>Type B pipe bends<\/strong> to EN 10253-2, EN 10253-4 or DIN 2605 Part 2 with full pressure factor<\/li><li>Small batches and single items with very short delivery times<\/li><\/ul><\/div><div><h3>We manufacture pipe bends to EN 10253, DIN 2605 or ASME B16.9:<\/h3><div class=\"table-scroll\" style=\"margin-top:1rem\"><table class=\"spec-table\"><tbody><tr><th scope=\"row\">Outside diameter<\/th><td>13.7 mm \u2013 219.1 mm<\/td><\/tr><tr><th scope=\"row\">Wall thickness<\/th><td>1 mm to 55 mm, depending on outside diameter<\/td><\/tr><tr><th scope=\"row\">Angle<\/th><td>15\u00b0, 30\u00b0, 45\u00b0, 90\u00b0, 180\u00b0 and intermediate angles, depending on size<\/td><\/tr><tr><th scope=\"row\">Type<\/th><td>2D, 3D, 5D, Long Radius (LR), Short Radius (SR) \u2013 more radii under <a href=\"#biegeradius\">Bending radii<\/a><\/td><\/tr><tr><th scope=\"row\">Standards<\/th><td>EN 10253 Type A and B, DIN 2605 Part 1 and 2, ASME B16.9, manufacture to customer specification<\/td><\/tr><tr><th scope=\"row\">Tolerances<\/th><td>We manufacture to the usual tolerances of the pipe bend standards \u2013 often tighter, e.g. with a bending diameter tolerance of \u00b11 mm.<\/td><\/tr><\/tbody><\/table><\/div><\/div><\/div><div class=\"reveal\" style=\"margin-top:1.6rem\"><p>Our pipe bends are used worldwide \u2013 for example in <a href=\"#referenzen\">refineries and power plants<\/a>, high-efficiency gas power plants, on oil platforms, in heat exchangers and in mechanical engineering.<\/p><p>We supply seamless pipe bends in carbon steel, high-alloy steel or stainless steel. Our extensive experience in heat treatment allows us to form a wide range of materials \u2013 see the list under <a href=\"#werkstoffe\">Materials<\/a>.<\/p><p>Our production is subject to strict quality control: dimensional checks accompany every stage of manufacture, so deviations are detected early. Siekmann is monitored by T\u00dcV Nord and certified to ISO&nbsp;9001:2015 \u2013 the basis for continuous improvement of our processes. More under <a href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/service\/\">Service &amp; quality<\/a>.<\/p><div class=\"callout callout-row\"><p><strong>Looking to buy pipe bends?<\/strong> Our contact page has a form for sending your request directly.<\/p><a class=\"btn btn-blau\" href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/contact\/\">Send a request \u2192<\/a><\/div><\/div><\/div><\/section><section id=\"werkstoffe\" class=\"alt\"><div class=\"wrap reveal\"><p class=\"eyebrow\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/05\/rohrbogen_apple.png\" alt=\"\" width=\"18\" height=\"18\" loading=\"lazy\">Materials<\/p><h2>Materials for pipe bends<\/h2><p class=\"lead\">Over the years we have gained broad experience in pipe bend manufacturing. Carbon steels, high-alloy steels and stainless steels are among the materials we process. We manufacture pipe bends from the following materials:<\/p><div class=\"tabs\" role=\"tablist\"><button type=\"button\" class=\"tab-btn active\" role=\"tab\" aria-selected=\"true\" data-tab=\"endin\">EN \/ DIN<\/button><button type=\"button\" class=\"tab-btn\" role=\"tab\" aria-selected=\"false\" data-tab=\"asme\">ASME<\/button><\/div><div class=\"tab-panel active\" id=\"skr-panel-endin\" role=\"tabpanel\"><ul class=\"chips\"><li>P235GH TC1\/2 (St 35.8 I\/III)<\/li><li>P265GH<\/li><li>S355J2H<\/li><li>16Mo3 (15Mo3)<\/li><li>10CrMo9-10 (10CrMo910)<\/li><li>13CrMo4-5 (13CrMo44)<\/li><li>X11CrMo5<\/li><li>X11CrMo9-1<\/li><li>X20CrMoV11-1<\/li><li>X10CrMoVNb9-1<\/li><li>X10CrWMoVNb9-2<\/li><li>7CrMoVTiB10-10<\/li><li>P215NL (TTSt35N\/V)<\/li><li>12Ni14 (10Ni14)<\/li><li>P355N (StE355)<\/li><li>P355NH (WStE355)<\/li><li>P355NL1 (TStE355)<\/li><li>P355NL2<\/li><li>L290NB (StE 290.7)<\/li><li>L360NB (StE 360.7)<\/li><li>L415<\/li><li>1.4301<\/li><li>1.4306<\/li><li>1.4361<\/li><li>1.4362 (Lean Duplex)<\/li><li>1.4401<\/li><li>1.4404<\/li><li>1.4410<\/li><li>1.4435<\/li><li>1.4436<\/li><li>1.4439<\/li><li>1.4462 (Duplex)<\/li><li>1.4466 (Super Duplex)<\/li><li>1.4501<\/li><li>1.4539<\/li><li>1.4541<\/li><li>1.4547<\/li><li>1.4550<\/li><li>1.4571<\/li><li>1.4841<\/li><li>1.4749<\/li><li>1.4828<\/li><li>1.4878<\/li><li>1.4876<\/li><li>1.4952<\/li><li>1.4835<\/li><li>1.4877<\/li><li>1.4910<\/li><li>1.4922<\/li><\/ul><\/div><div class=\"tab-panel\" id=\"skr-panel-asme\" role=\"tabpanel\"><ul class=\"chips\"><li>WPA<\/li><li>WPB<\/li><li>WPC<\/li><li>WP1<\/li><li>WP5<\/li><li>WP9<\/li><li>WP11<\/li><li>WP12<\/li><li>WP22<\/li><li>WP32\/27<\/li><li>WP91<\/li><li>WP92<\/li><li>WP304<\/li><li>WP304H<\/li><li>WP304L<\/li><li>WP310<\/li><li>WP316<\/li><li>WP316L<\/li><li>WP316Ti<\/li><li>WP321<\/li><li>WP347<\/li><li>WP347H<\/li><li>WPL3<\/li><li>WPL6<\/li><li>X42<\/li><li>X52<\/li><li>WPHY52<\/li><li>WPHY60<\/li><li>S30815<\/li><li>S31000<\/li><li>S31050<\/li><li>S31500<\/li><li>S31726<\/li><li>S31803<\/li><li>S32760<\/li><li>N08904<\/li><li>Alloy 800H<\/li><li>DMV310N<\/li><\/ul><\/div><p class=\"muted\" style=\"margin-top:1.4rem\">Your material is not listed? <a href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/contact\/\">Ask us<\/a> \u2013 thanks to our heat treatment experience we also form special materials.<\/p><div class=\"gallery\"><figure><img src=\"\/wp-content\/uploads\/2021\/05\/K1600_20140508-IMG_0082.jpg\" alt=\"Seamless steel pipe bend with special bevel for industrial piping\" width=\"1024\" height=\"683\" loading=\"lazy\" decoding=\"async\"><figcaption>Pipe bend with special bevel<\/figcaption><\/figure><figure><img src=\"\/wp-content\/uploads\/2021\/05\/K1600_20160315-IMG_00582.jpg\" alt=\"Heavy-wall steel pipe bend as a high-pressure fitting\" width=\"1024\" height=\"683\" loading=\"lazy\" decoding=\"async\"><figcaption>Heavy-wall high-pressure fitting<\/figcaption><\/figure><figure><img src=\"\/wp-content\/uploads\/2021\/05\/K1600_20160315-IMG_01042.jpg\" alt=\"Pipe bend with a tight bending radius\" width=\"1024\" height=\"683\" loading=\"lazy\" decoding=\"async\"><figcaption>Tight bending radius<\/figcaption><\/figure><\/div><\/div><\/section><section id=\"normen\"><div class=\"wrap reveal\"><p class=\"eyebrow\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/05\/rohrbogen_apple.png\" alt=\"\" width=\"18\" height=\"18\" loading=\"lazy\">Standards<\/p><h2>Which standards apply to pipe bends?<\/h2><div class=\"callout\"><span class=\"tag\">Current editions<\/span><p>Since July 2026, <strong>DIN EN 10253-2:2026-07<\/strong> (EN 10253-2:2021+A1:2025) applies to ferritic steels, and since October 2025, <strong>DIN EN 10253-4:2025-10<\/strong> applies to austenitic and duplex steels. Both editions contain bending radii that differ in part from the previous standards. We are happy to explain the differences \u2013 <a href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/contact\/\">get in touch<\/a>.<\/p><\/div><div class=\"cards\"><article class=\"card\"><h3>EN 10253-2<\/h3><p>The current standard for butt-welding fittings made of non-alloy and alloy <strong>ferritic steels<\/strong> with specific inspection requirements. It combines several DIN standards for different fittings into one European standard; the pipe bend part is the relevant one for us. We supply types 2D, 3D, 5D and many special radii in between. The standard also covers pipe bends with full pressure factor (<a href=\"#TypATypB\">Type B<\/a>): these have a significantly thicker wall on the inside of the bend, where stress is highest. Various options can also be agreed.<\/p><p class=\"ex\">Example \u2014 Option 15: Each fitting shall be hardness tested.<\/p><\/article><article class=\"card\"><h3>EN 10253-4<\/h3><p>This standard covers butt-welding fittings made of <strong>austenitic and austenitic-ferritic (duplex) steels<\/strong> with specific inspection requirements. It largely corresponds to EN 10253-2, but some bending radii differ. Our team is happy to explain the differences. The options of EN 10253-2 are also included here, but differ fundamentally.<\/p><p class=\"ex\">Example \u2014 Option 15: An inspection certificate 3.2 to EN 10204 shall be issued.<\/p><\/article><article class=\"card\"><h3>DIN 2605<\/h3><p>The former German pipe bend standard, now replaced by EN 10253. For pipe bends with full pressure factor it specifies different wall thicknesses than the new standards. DIN 2605 is less extensive than EN 10253 and covers only pipe bends, no other fittings.<\/p><\/article><article class=\"card\"><h3>ASME B16.9<\/h3><p><strong>ASME B16.9<\/strong> sets out the technical requirements for seamless and welded steel fittings \u2013 including pipe bends in different designs. Dimensions are given in <strong>inches (outside diameter)<\/strong> and <strong>schedules (wall thicknesses)<\/strong>. Pipe bends to ASME B16.9 are used worldwide in plant and pipeline construction and stand for high compatibility and compliance.<\/p><\/article><\/div><\/div><\/section><section id=\"grundlagen\" class=\"alt\"><div class=\"wrap grid-2 reveal\"><figure class=\"shot\"><img src=\"\/wp-content\/uploads\/2021\/05\/K1600_Rohrbogen_01.jpg\" alt=\"Seamless 180-degree steel return bend\" width=\"800\" height=\"533\" loading=\"lazy\" decoding=\"async\"><\/figure><div><p class=\"eyebrow\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/05\/rohrbogen_apple.png\" alt=\"\" width=\"18\" height=\"18\" loading=\"lazy\">Basics<\/p><h2>What is a pipe bend?<\/h2><p>A pipe bend is a pipe fitting that changes the direction of a piping system. Pipe bends differ in outside diameter, wall thickness, <a href=\"#biegeradius\">bending radius<\/a>, angle and <a href=\"#werkstoffe\">material<\/a>. They are usually made either from welded half-shells or \u2013 as at Siekmann \u2013 from seamless pipe. Pipe bends are used in power plant construction, mechanical engineering, heat exchanger and plant construction and many other fields.<\/p><\/div><\/div><\/section><section id=\"TypATypB\"><div class=\"wrap reveal\"><p class=\"eyebrow\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/05\/rohrbogen_apple.png\" alt=\"\" width=\"18\" height=\"18\" loading=\"lazy\">Pressure factor<\/p><h2>Type A \/ Type B \u2013 the difference<\/h2><div class=\"grid-2 top\"><article class=\"card\"><h3>Type A \u2013 reduced pressure factor<\/h3><p>The fittings have the same wall thickness on the bend body as at the weld ends. Their resistance to internal pressure is lower than that of a pipe with the same outside diameter, wall thickness and material \u2013 hence the term <strong>reduced pressure factor<\/strong>. As at the pipe connection, the wall thickness over the whole fitting body must not fall below \u221212.5&nbsp;% of the nominal wall thickness.<\/p><p class=\"val\"><small>Example 76.1 \u00d7 12.5 (2D)<\/small>Inner wall thickness: 11.0 mm<\/p><\/article><article class=\"card\"><h3>Type B \u2013 full pressure factor<\/h3><p>The fittings have an increased wall thickness on the inside of the bend body. Their resistance to internal pressure equals that of a pipe with the same outside diameter, wall thickness and material \u2013 the <strong>full pressure factor<\/strong>. The required wall thickness on the inside of the bend is calculated with a complex formula from outside diameter, wall thickness and, above all, bending diameter. Pipe bends with particularly tight bending diameters need a much thicker inner wall.<\/p><p class=\"val\"><small>Example 76.1 \u00d7 12.5 (2D)<\/small>Inner wall thickness: 16.8 mm<\/p><\/article><\/div><p style=\"margin-top:1.4rem\">EN 10253-2 and EN 10253-4 classify pipe bends into two types under different names: EN 10253-2 calls them <strong>Type A and Type B<\/strong>, EN 10253-4 calls them <strong>Design A and Design B<\/strong>.<\/p><figure class=\"fig\"><img src=\"\/wp-content\/uploads\/2021\/09\/TYPA_B-1.jpg\" alt=\"Wall thickness cross-section: Type A and Type B pipe bend, 76.1 \u00d7 12.5 mm, 2D\" width=\"1024\" height=\"617\" loading=\"lazy\" decoding=\"async\"><\/figure><div class=\"calc\" id=\"typ-b-rechner\"><div class=\"calc-head\"><h3>Wall thickness calculator Type A \/ Type B<\/h3><\/div><p class=\"muted\">Enter the outside diameter and nominal wall thickness and move the bending radius. The bars show the minimum wall of a Type A bend (nominal wall \u221212.5&nbsp;%) and the required minimum wall t<sub>int,min<\/sub> on the intrados of a Type B bend to EN 10253-2.<\/p><div class=\"calc-fields\"><label for=\"skr-d\">Outside diameter <span>(mm)<\/span><input type=\"text\" inputmode=\"decimal\" id=\"skr-d\" value=\"76.1\" autocomplete=\"off\"><\/label><label for=\"skr-t\">Nominal wall thickness <span>(mm)<\/span><input type=\"text\" inputmode=\"decimal\" id=\"skr-t\" value=\"12.5\" autocomplete=\"off\"><\/label><label for=\"skr-r\">Bending radius R <span>(mm)<\/span><input type=\"text\" inputmode=\"decimal\" id=\"skr-r\" value=\"63\" autocomplete=\"off\"><\/label><\/div><div class=\"slider\"><div class=\"slider-top\"><label for=\"skr-r-range\">Move bending radius<\/label><b id=\"skr-r-label\"><\/b><\/div><input type=\"range\" id=\"skr-r-range\" min=\"57\" max=\"228\" step=\"0.5\" value=\"63\"><div class=\"slider-top\"><span>\u2190 tight<\/span><span>wide \u2192<\/span><\/div><div class=\"presets\"><span class=\"muted\" style=\"align-self:center;margin-right:.3rem\">Standard radius:<\/span><button type=\"button\" class=\"tab-btn sm\" data-preset=\"2d\">2D<\/button><button type=\"button\" class=\"tab-btn sm\" data-preset=\"3d\">3D<\/button><button type=\"button\" class=\"tab-btn sm\" data-preset=\"5d\">5D<\/button><\/div><p class=\"calc-note\" id=\"skr-preset-info\" aria-live=\"polite\"><\/p><\/div><div class=\"bars\" role=\"status\" aria-live=\"polite\"><div class=\"wall-row\"><span class=\"wall-label\">Type A<small>normal wall (minimum wall)<\/small><\/span><div class=\"wall-track\"><div class=\"wall-bar grey\" id=\"skr-bar-a\">\u2013<\/div><\/div><\/div><div class=\"wall-row\"><span class=\"wall-label\">Type B<small>reinforced wall on intrados<\/small><\/span><div class=\"wall-track\"><div class=\"wall-bar\" id=\"skr-bar-b\">\u2013<\/div><\/div><\/div><p class=\"wall-delta\" id=\"skr-delta\"><\/p><\/div><p class=\"calc-note\">Values for guidance only, rounded up to 0.1 mm. They do not replace a design calculation.<\/p><\/div><h3 style=\"margin-top:2.2rem\">Part 1 or Part 2 to DIN 2605<\/h3><p>DIN 2605 also distinguishes between reduced and full pressure factor. With full pressure factor \u2013 the <strong>Part 2 pipe bend<\/strong> \u2013 the wall in the inner curve is considerably thicker. Unlike EN 10253, DIN 2605 does not give a calculation formula but lists the wall thicknesses in tables.<\/p><p>The <strong>Part 1 pipe bend<\/strong> has no reinforcement on the inner radius; the same wall thickness tolerances apply over the whole bend.<\/p><\/div><\/section><section id=\"bauarten\" class=\"alt\"><div class=\"wrap reveal\"><p class=\"eyebrow\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/05\/rohrbogen_apple.png\" alt=\"\" width=\"18\" height=\"18\" loading=\"lazy\">Types<\/p><h2>Differences between pipe bend types<\/h2><p>Pipe bends differ in outside diameter, wall thickness and bending diameter. The standards define so-called standard types for the bending diameter \u2013 this harmonisation helps designers with planning. EN and DIN define the standard types <strong>2D, 3D, 5D and 10D<\/strong>. The American ASME B16.9 uses the terms <strong>Long Radius<\/strong> and <strong>Short Radius<\/strong>: Long Radius roughly corresponds to 3D, Short Radius roughly to 2D.<\/p><figure class=\"fig\"><img src=\"\/wp-content\/uploads\/2021\/06\/biegedurchmesser.jpg\" alt=\"Diagram: pipe bends of types 2D, 3D and 5D compared by bending diameter\" width=\"1000\" height=\"150\" loading=\"lazy\" decoding=\"async\"><\/figure><p>Still, the standards differ in places. A pipe bend with an outside diameter of 101.6&nbsp;mm has a bending diameter of 190.0&nbsp;mm as <strong>type 2D<\/strong> to EN 10253-2:2008 \u2013 but only 177.8&nbsp;mm as <strong>Short Radius<\/strong> to ASME B16.9. As type 5D the bending diameter is 415.0&nbsp;mm to EN 10253-2:2008, but 410&nbsp;mm to EN 10253-4 (for austenitic steels). Care is needed here to avoid mix-ups.<\/p><div class=\"bauart-demo\"><svg viewBox=\"0 0 250 220\" aria-hidden=\"true\" focusable=\"false\"><path class=\"demo-guide\" d=\"M 30 200 L 230 200 M 30 200 L 30 10\"\/><path class=\"demo-arc\" id=\"skr-arc\" d=\"M 30 130 A 70 70 0 0 1 100 200\"\/><\/svg><div class=\"bauart-info\"><div class=\"tabs\" role=\"group\" aria-label=\"Select type\"><button type=\"button\" class=\"tab-btn active\" aria-pressed=\"true\" data-bauart=\"2d\">2D<\/button><button type=\"button\" class=\"tab-btn\" aria-pressed=\"false\" data-bauart=\"3d\">3D<\/button><button type=\"button\" class=\"tab-btn\" aria-pressed=\"false\" data-bauart=\"5d\">5D<\/button><\/div><div aria-live=\"polite\"><h3 id=\"skr-bauart-title\">Type 2D \u2013 tight bending radius<\/h3><p id=\"skr-bauart-text\">Type 2D pipe bends have a tight bending radius approximately equal to one pipe diameter. They allow compact changes of direction where space is limited and are geometrically comparable to short-radius elbows to ASME B16.9. When made as Type B to EN 10253-2, an increased wall thickness is required, particularly on the intrados (inside of the bend), to ensure full internal pressure resistance.<\/p><\/div><\/div><\/div><div class=\"callout\"><p>Many applications need pipe bends with tighter tolerances on the bending diameter \u2013 and that is where Siekmann comes in: our manufacturing processes achieve much tighter tolerances than the standard values. On request, instead of the \u00b17&nbsp;mm of EN 10253-2, we can also manufacture pipe bends with a tolerance of down to <strong>\u00b11&nbsp;mm<\/strong> on the bending radius.<\/p><\/div><h3 style=\"margin-top:2.2rem\">Types 2D, 3D and 5D compared across standards<\/h3><p class=\"muted\">The table below compares the bending radii of the types across the different editions of the standards (without guarantee). The \u201cEN 10253-2 2021-11\u201d columns already show the <strong>new 2021 edition<\/strong>; for EN 10253-4, <strong>DIN EN 10253-4:2025-10<\/strong> has applied since October 2025 with further changes to the bending radii \u2013 <a href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/contact\/\">we are happy to advise you<\/a>.<\/p><div class=\"col-filter-bar\" role=\"group\"><button type=\"button\" class=\"tab-btn sm active\" aria-pressed=\"true\" data-cols=\"all\">All radii<\/button><button type=\"button\" class=\"tab-btn sm\" aria-pressed=\"false\" data-cols=\"2d\">Only 2D<\/button><button type=\"button\" class=\"tab-btn sm\" aria-pressed=\"false\" data-cols=\"3d\">Only 3D<\/button><button type=\"button\" class=\"tab-btn sm\" aria-pressed=\"false\" data-cols=\"5d\">Only 5D<\/button><\/div><p class=\"swipe-hint\" aria-hidden=\"true\">Swipe table sideways \u2192<\/p><div class=\"table-scroll tall\" tabindex=\"0\" aria-label=\"Comparison table of types 2D, 3D, 5D by edition of the standard\"><table id=\"skr-bau-table\"><caption style=\"position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)\">Bending radii of types 2D, 3D and 5D to EN 10253-2 (2021 and 2008) and EN 10253-4 (2008), in mm<\/caption><thead><tr><th scope=\"col\">OD<br>mm<\/th><th scope=\"col\">2D<br>EN 10253-2:2021<\/th><th scope=\"col\">2D<br>EN 10253-2:2008<\/th><th scope=\"col\">2D<br>EN 10253-4:2008<\/th><th scope=\"col\">3D<br>EN 10253-2:2021<\/th><th scope=\"col\">3D<br>EN 10253-2:2008<\/th><th scope=\"col\">3D<br>EN 10253-4:2008<\/th><th scope=\"col\">5D<br>EN 10253-2:2021<\/th><th scope=\"col\">5D<br>EN 10253-2:2008<\/th><th scope=\"col\">5D<br>EN 10253-4:2008<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">17.2<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">20.0<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">21.3<\/th><td>17.5<\/td><td>25.0<\/td><td>25.0<\/td><td>28.0<\/td><td>38.0<\/td><td>28.0<\/td><td>42.5<\/td><td>42.5<\/td><td>45.0<\/td><\/tr><tr><th scope=\"row\">25.0<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>27.5<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">26.9<\/th><td>25.0<\/td><td>25.0<\/td><td>25.0<\/td><td>29.0<\/td><td>38.0<\/td><td>29.0<\/td><td>57.5<\/td><td>57.5<\/td><td>57.0<\/td><\/tr><tr><th scope=\"row\">30.0<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">31.8<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>35.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">33.7<\/th><td>25.0<\/td><td>25.0<\/td><td>28.0<\/td><td>38.0<\/td><td>38.0<\/td><td>38.0<\/td><td>72.5<\/td><td>72.5<\/td><td>72.0<\/td><\/tr><tr><th scope=\"row\">35.0<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">38.0<\/th><td>32.5<\/td><td>\u2013<\/td><td>\u2013<\/td><td>45.0<\/td><td>45.0<\/td><td>\u2013<\/td><td>82.5<\/td><td>82.5<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">42.4<\/th><td>32.0<\/td><td>32.0<\/td><td>32.0<\/td><td>48.0<\/td><td>48.0<\/td><td>48.0<\/td><td>92.5<\/td><td>92.5<\/td><td>93.0<\/td><\/tr><tr><th scope=\"row\">44.5<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">48.3<\/th><td>38.0<\/td><td>38.0<\/td><td>38.0<\/td><td>57.0<\/td><td>57.0<\/td><td>57.0<\/td><td>107.5<\/td><td>109.5<\/td><td>108.0<\/td><\/tr><tr><th scope=\"row\">51.0<\/th><td>45.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>63.0<\/td><td>63.0<\/td><td>\u2013<\/td><td>115.0<\/td><td>122.5<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">54.0<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">57.0<\/th><td>52.5<\/td><td>\u2013<\/td><td>\u2013<\/td><td>72.0<\/td><td>72.0<\/td><td>\u2013<\/td><td>127.5<\/td><td>130.0<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">60.3<\/th><td>51.0<\/td><td>51.0<\/td><td>51.0<\/td><td>76.0<\/td><td>76.0<\/td><td>76.0<\/td><td>135.0<\/td><td>137.5<\/td><td>135.0<\/td><\/tr><tr><th scope=\"row\">63.5<\/th><td>57.5<\/td><td>\u2013<\/td><td>\u2013<\/td><td>82.5<\/td><td>\u2013<\/td><td>\u2013<\/td><td>142.5<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">70.0<\/th><td>65.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>92.0<\/td><td>92.0<\/td><td>\u2013<\/td><td>160.0<\/td><td>160.0<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">76.1<\/th><td>63.0<\/td><td>63.0<\/td><td>63.0<\/td><td>95.0<\/td><td>95.0<\/td><td>95.0<\/td><td>175.0<\/td><td>175.0<\/td><td>175.0<\/td><\/tr><tr><th scope=\"row\">82.5<\/th><td>77.5<\/td><td>\u2013<\/td><td>\u2013<\/td><td>107.5<\/td><td>\u2013<\/td><td>\u2013<\/td><td>190.0<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">88.9<\/th><td>76.0<\/td><td>76.0<\/td><td>76.0<\/td><td>114.0<\/td><td>114.0<\/td><td>114.0<\/td><td>205.0<\/td><td>207.5<\/td><td>205.0<\/td><\/tr><tr><th scope=\"row\">95.0<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">101.6<\/th><td>95.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>133.0<\/td><td>133.0<\/td><td>\u2013<\/td><td>237.5<\/td><td>235.0<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">108.0<\/th><td>100.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>142.5<\/td><td>142.5<\/td><td>\u2013<\/td><td>253.0<\/td><td>253.0<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">114.3<\/th><td>102.0<\/td><td>102.0<\/td><td>102.0<\/td><td>152.0<\/td><td>152.0<\/td><td>152.0<\/td><td>270.0<\/td><td>270.0<\/td><td>270.0<\/td><\/tr><tr><th scope=\"row\">121.0<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">127.0<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>175.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">133.0<\/th><td>125.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>181.0<\/td><td>181.0<\/td><td>\u2013<\/td><td>312.5<\/td><td>311.5<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">139.7<\/th><td>127.0<\/td><td>127.0<\/td><td>127.0<\/td><td>190.0<\/td><td>190.0<\/td><td>190.0<\/td><td>330.0<\/td><td>330.0<\/td><td>330.0<\/td><\/tr><tr><th scope=\"row\">146.0<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>&#8211;<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">152.4<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>215.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">159.0<\/th><td>150.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>216.0<\/td><td>216.0<\/td><td>\u2013<\/td><td>375.0<\/td><td>375.0<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">165.1<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">168.3<\/th><td>152.0<\/td><td>152.0<\/td><td>152.0<\/td><td>229.0<\/td><td>229.0<\/td><td>229.0<\/td><td>390.0<\/td><td>390.0<\/td><td>390.0<\/td><\/tr><tr><th scope=\"row\">177.8<\/th><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>250.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">193.7<\/th><td>180.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>270.0<\/td><td>270.0<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">219.1<\/th><td>203.0<\/td><td>203.0<\/td><td>203.0<\/td><td>305.0<\/td><td>305.0<\/td><td>305.0<\/td><td>510.0<\/td><td>515.0<\/td><td>510.0<\/td><\/tr><\/tbody><\/table><\/div><\/div><\/section><section id=\"biegeradius\"><span id=\"biegedurchmesser\"><\/span><div class=\"wrap reveal\"><p class=\"eyebrow\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/05\/rohrbogen_apple.png\" alt=\"\" width=\"18\" height=\"18\" loading=\"lazy\">Bending radii<\/p><h2>Which bending radii does Siekmann offer?<\/h2><p class=\"lead\">We also manufacture pipe bends outside the standard radii 2D, 3D and 5D. Our extensive range of tools allows many special sizes up to 219&nbsp;mm outside diameter. The table below lists every bending radius we have already produced pipe bends with.<\/p><div class=\"search\"><label for=\"skr-rad-search\">Search outside diameter<\/label><input type=\"search\" id=\"skr-rad-search\" placeholder=\"e.g. 60.3\" inputmode=\"decimal\" autocomplete=\"off\"><span class=\"count\" id=\"skr-rad-count\" role=\"status\" aria-live=\"polite\"><\/span><\/div><div class=\"table-scroll tall\" tabindex=\"0\" aria-label=\"Table of available bending radii by outside diameter\"><table id=\"skr-rad-table\"><caption style=\"position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)\">Bending radii already manufactured, by outside diameter, in mm. Radii marked * can only be made at 90\u00b0.<\/caption><thead><tr><th scope=\"col\">Outside diameter<br>mm<\/th><th scope=\"col\">Bending radius R<br>mm<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">10<\/th><td>20<\/td><\/tr><tr><th scope=\"row\">14<\/th><td>20<\/td><\/tr><tr><th scope=\"row\">16<\/th><td>16<\/td><\/tr><tr><th scope=\"row\">18<\/th><td>21<\/td><\/tr><tr><th scope=\"row\">20<\/th><td>16 \u2013 25 \u2013 26.5<\/td><\/tr><tr><th scope=\"row\">21.3<\/th><td>17.5 \u2013 19.5 \u2013 25 \u2013 27.5 \u2013 28 \u2013 38 \u2013 42.5 \u2013 43.5 \u2013 150<\/td><\/tr><tr><th scope=\"row\">22<\/th><td>38 \u2013 45 \u2013 110<\/td><\/tr><tr><th scope=\"row\">25<\/th><td>21 \u2013 25 \u2013 27.5 \u2013 30 \u2013 34 \u2013 44 \u2013 45 \u2013 53 \u2013 60 \u2013 90<\/td><\/tr><tr><th scope=\"row\">26.9<\/th><td>24 \u2013 25 \u2013 25.5 \u2013 28.75 \u2013 29 \u2013 30 \u2013 32 \u2013 34 \u2013 38 \u2013 39 \u2013 40 \u2013 42.5 \u2013 47.5 \u2013 50 \u2013 52.5 \u2013 57.5 \u2013 58.5 \u2013 67.5 \u2013 70 \u2013 85 \u2013 100 \u2013 190<\/td><\/tr><tr><th scope=\"row\">28<\/th><td>28.5 \u2013 32.5 \u2013 33.5 \u2013 35 \u2013 42 \u2013 48<\/td><\/tr><tr><th scope=\"row\">30<\/th><td>25 \u2013 29 \u2013 33.5 \u2013 34 \u2013 35 \u2013 37.5 \u2013 45 \u2013 50 \u2013 55 \u2013 62.5 \u2013 68<\/td><\/tr><tr><th scope=\"row\">31.8<\/th><td>24 \u2013 25 \u2013 27.5 \u2013 30 \u2013 32.5 \u2013 35 \u2013 35.5 \u2013 36.5 \u2013 38 \u2013 39 \u2013 40 \u2013 45 \u2013 50 \u2013 55 \u2013 60 \u2013 63.5 \u2013 67.5 \u2013 80 \u2013 100 \u2013 105 \u2013 112.5<\/td><\/tr><tr><th scope=\"row\">32<\/th><td>25 \u2013 28 \u2013 32.5<\/td><\/tr><tr><th scope=\"row\">33.7<\/th><td>22.5 \u2013 25 \u2013 26.5 \u2013 28 \u2013 30 \u2013 31.5 \u2013 35 \u2013 37.5 \u2013 38 \u2013 39.5 \u2013 40 \u2013 45 \u2013 50 \u2013 60 \u2013 72.5 \u2013 125 \u2013 135 \u2013 240<\/td><\/tr><tr><th scope=\"row\">35<\/th><td>25.5 \u2013 38 \u2013 45 \u2013 45 \u2013 46.5 \u2013 60 \u2013 75 \u2013 100<\/td><\/tr><tr><th scope=\"row\">38<\/th><td>25 \u2013 27 \u2013 27.5 \u2013 29.5 \u2013 30 \u2013 32 \u2013 32.5 \u2013 35 \u2013 37.5 \u2013 37.75 \u2013 38 \u2013 38.5 \u2013 39.5 \u2013 40 \u2013 40.5 \u2013 42.5 \u2013 45 \u2013 45.5 \u2013 46.5 \u2013 47.5 \u2013 48 \u2013 50 \u2013 51.3 \u2013 55 \u2013 57 \u2013 57.5 \u2013 59 \u2013 60 \u2013 65 \u2013 66.5 \u2013 70 \u2013 75 \u2013 80 \u2013 82.5 \u2013 83 \u2013 85 \u2013 93 \u2013 99 \u2013 113 \u2013 145 \u2013 190<\/td><\/tr><tr><th scope=\"row\">40<\/th><td>47.5 \u2013 51.5 \u2013 55 \u2013 185<\/td><\/tr><tr><th scope=\"row\">42.4<\/th><td>30 \u2013 31 \u2013 32 \u2013 37.5 \u2013 38.5 \u2013 42.5 \u2013 45 \u2013 46 \u2013 48 \u2013 49 \u2013 50 \u2013 57 \u2013 63 \u2013 65 \u2013 70 \u2013 72.5 \u2013 75 \u2013 80 \u2013 92.5 \u2013 93.5 \u2013 185<\/td><\/tr><tr><th scope=\"row\">44.5<\/th><td>34 \u2013 35 \u2013 40 \u2013 42.25 \u2013 45 \u2013 50 \u2013 51 \u2013 52.5 \u2013 53.5 \u2013 55 \u2013 55.5 \u2013 57.5 \u2013 70 \u2013 70.5 \u2013 80 \u2013 97.5 \u2013 99.5 \u2013 136<\/td><\/tr><tr><th scope=\"row\">48.3<\/th><td>38 \u2013 39 \u2013 40 \u2013 42.5 \u2013 45.5 \u2013 48 \u2013 50 \u2013 51 \u2013 57 \u2013 60 \u2013 75 \u2013 76.2 \u2013 80 \u2013 85 \u2013 100 \u2013 107.5 \u2013 109.5 \u2013 112.5 \u2013 115 \u2013 135 \u2013 249<\/td><\/tr><tr><th scope=\"row\">51<\/th><td>32.5 \u2013 38 \u2013 45 \u2013 46.5 \u2013 47.5 \u2013 51 \u2013 52.5 \u2013 55 \u2013 57 \u2013 61 \u2013 63.5 \u2013 65 \u2013 67.5 \u2013 69.85 \u2013 76.2 \u2013 80 \u2013 92.5 \u2013 115 \u2013 122.5<\/td><\/tr><tr><th scope=\"row\">54<\/th><td>50 \u2013 54 \u2013 72.5 \u2013 97.5<\/td><\/tr><tr><th scope=\"row\">57<\/th><td>42.5 \u2013 52.5 \u2013 53.5 \u2013 57.5 \u2013 66 \u2013 72 \u2013 75 \u2013 77.5 \u2013 84 \u2013 85 \u2013 90 \u2013 92.5 \u2013 102.5 \u2013 104 \u2013 112.5 \u2013 127.5<\/td><\/tr><tr><th scope=\"row\">60.3<\/th><td>38.1 \u2013 40 \u2013 48.75 \u2013 51 \u2013 55 \u2013 57.15 \u2013 60 \u2013 66 \u2013 75 \u2013 76 \u2013 77.5 \u2013 78.5 \u2013 84 \u2013 90 \u2013 95 \u2013 100 \u2013 101.5 \u2013 107.5 \u2013 109 \u2013 117 \u2013 122 \u2013 135 \u2013 140 \u2013 240 \u2013 250 \u2013 350 \u2013 400<\/td><\/tr><tr><th scope=\"row\">63.5<\/th><td>41.25 \u2013 46.5 \u2013 55 \u2013 57.5 \u2013 59 \u2013 64 \u2013 77.5 \u2013 82.5 \u2013 115 \u2013 142.5 \u2013 210<\/td><\/tr><tr><th scope=\"row\">70<\/th><td>50 \u2013 55 \u2013 62.5 \u2013 65 \u2013 75 \u2013 80.5 \u2013 92 \u2013 94 \u2013 95 \u2013 127.5 \u2013 161.5 \u2013 165<\/td><\/tr><tr><th scope=\"row\">73<\/th><td>63.5 \u2013 77.5<\/td><\/tr><tr><th scope=\"row\">75<\/th><td>95<\/td><\/tr><tr><th scope=\"row\">76.1<\/th><td>63 \u2013 70 \u2013 77 \u2013 87.5 \u2013 88 \u2013 95 \u2013 97 \u2013 95 \u2013 105 \u2013 137 \u2013 140 \u2013 140.5 \u2013 150 \u2013 175<\/td><\/tr><tr><th scope=\"row\">80<\/th><td>78.5 \u2013 109 \u2013 160<\/td><\/tr><tr><th scope=\"row\">82.5<\/th><td>63.5 \u2013 77.5 \u2013 79 \u2013 80 \u2013 107.5 \u2013 114.5 \u2013 175 \u2013 190<\/td><\/tr><tr><th scope=\"row\">85<\/th><td>116.5<\/td><\/tr><tr><th scope=\"row\">88.9<\/th><td>57.5 \u2013 58 \u2013 76 \u2013 78 \u2013 80 \u2013 82.5 \u2013 87.5 \u2013 114 \u2013 162.5 \u2013 165 \u2013 185 \u2013 205<\/td><\/tr><tr><th scope=\"row\">100<\/th><td>133<\/td><\/tr><tr><th scope=\"row\">101.6<\/th><td>76 \u2013 89 \u2013 95 \u2013 97 \u2013 133.5 \u2013 150 \u2013 180 \u2013 190 \u2013 237.5<\/td><\/tr><tr><th scope=\"row\">102<\/th><td>126 \u2013 250<\/td><\/tr><tr><th scope=\"row\">106<\/th><td>144.5<\/td><\/tr><tr><th scope=\"row\">108<\/th><td>100 \u2013 101.5 \u2013 142.5 \u2013 200 \u2013 250 \u2013 252.5<\/td><\/tr><tr><th scope=\"row\">114.3<\/th><td>102 \u2013 105 \u2013 116 \u2013 135 \u2013 152 \u2013 220 \u2013 270<\/td><\/tr><tr><th scope=\"row\">121<\/th><td>112.5 \u2013 120 \u2013 152 \u2013 170 \u2013 175 \u2013 282<\/td><\/tr><tr><th scope=\"row\">127<\/th><td>107.5 \u2013 117.5 \u2013 138.5 \u2013 175 \u2013 235 \u2013 300<\/td><\/tr><tr><th scope=\"row\">133<\/th><td>125 \u2013 181 \u2013 250 \u2013 312.5<\/td><\/tr><tr><th scope=\"row\">139.7<\/th><td>127 \u2013 132.5* \u2013 190 \u2013 250* \u2013 270* \u2013 330*<\/td><\/tr><tr><th scope=\"row\">152<\/th><td>142.5* \u2013 215*<\/td><\/tr><tr><th scope=\"row\">159<\/th><td>150* \u2013 216*<\/td><\/tr><tr><th scope=\"row\">168.3<\/th><td>152* \u2013 229* \u2013 390*<\/td><\/tr><tr><th scope=\"row\">177.8<\/th><td>250*<\/td><\/tr><tr><th scope=\"row\">193.7<\/th><td>270*<\/td><\/tr><tr><th scope=\"row\">219.1<\/th><td>203* \u2013 305*<\/td><\/tr><\/tbody><\/table><\/div><p class=\"muted\" style=\"margin-top:.8rem\">* only possible at 90\u00b0<\/p><div class=\"inline-cta\"><p><strong>Your bending radius is not listed?<\/strong> Feel free to ask about other radii.<\/p><a class=\"btn btn-blau\" href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/contact\/\">Ask about a radius \u2192<\/a><\/div><div class=\"gallery\"><figure><img src=\"\/wp-content\/uploads\/2021\/10\/Rohrbogen_07.jpg\" alt=\"Seamless steel pipe bend with machined weld ends\" width=\"800\" height=\"533\" loading=\"lazy\" decoding=\"async\"><figcaption>Machined weld ends<\/figcaption><\/figure><figure><img src=\"\/wp-content\/uploads\/2021\/10\/Rohrbogen_05.jpg\" alt=\"Pipe bend with orbital weld bevel\" width=\"800\" height=\"533\" loading=\"lazy\" decoding=\"async\"><figcaption>Orbital bevel<\/figcaption><\/figure><figure><img src=\"\/wp-content\/uploads\/2021\/10\/Rohrbogen_01.jpg\" alt=\"Seamless pipe bends in various dimensions\" width=\"800\" height=\"533\" loading=\"lazy\" decoding=\"async\"><figcaption>Various dimensions<\/figcaption><\/figure><\/div><\/div><\/section><section id=\"siekmann\" class=\"alt\"><div class=\"wrap reveal\"><p class=\"eyebrow\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/05\/rohrbogen_apple.png\" alt=\"\" width=\"18\" height=\"18\" loading=\"lazy\">Company<\/p><h2>Siekmann GmbH &amp; Co. KG \u2013 manufacturer of special pipe bends<\/h2><div class=\"grid-2 top\"><div><p class=\"lead\">Founded as a forge in 1907, we have been making pipe bends since 1940 \u2013 and today we specialise in <strong>special pipe bends made from seamless pipe<\/strong>.<\/p><p>Newly developed production processes, experienced staff and constant checks at every stage of manufacture ensure the highest quality.<\/p><ul class=\"check-list\"><li>Special sizes \u2013 also outside standard dimensions<\/li><li>Manufacture of heavy-wall pipe bends<\/li><li>Small batches too<\/li><li>Wide range of materials \u2013 carbon steel \/ stainless steel<\/li><li>Very short delivery times<\/li><li>Pipe bends with tight tolerances<\/li><\/ul><p>Our aim is to supply pipe bends quickly, reliably and in the highest quality. A large selection of tools allows us to produce almost any pipe bend between 13.7&nbsp;mm and 219.1&nbsp;mm outside diameter \u2013 especially with heavy walls.<\/p><p>Get to know us and <a href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/contact\/\">get in touch<\/a> \u2013 please use our <a href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/contact\/\">request form<\/a> for enquiries. You will find your sales contacts on the <a href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/contact\/\">contact page<\/a>.<\/p><\/div><div><h3>History<\/h3><ol class=\"timeline\"><li><b>1907<\/b><span>Founded as a village forge \u2013 forged parts for local agriculture<\/span><\/li><li><b>1928<\/b><span>First products for the heating sector<\/span><\/li><li><b>1940<\/b><span>The first pipe bends are successfully produced<\/span><\/li><li><b>1957<\/b><span>New production site in Lohne<\/span><\/li><li><b>1970<\/b><span>First trials with heavy-wall pipe bends<\/span><\/li><li><b>1992<\/b><span>Production switched to heavy-wall special pipe bends \u2013 newly developed manufacturing processes form the basis of today\u2019s success<\/span><\/li><li><b>today<\/b><span>Acquisition of new land and construction of a new production hall<\/span><\/li><\/ol><\/div><\/div><\/div><\/section><section id=\"referenzen\"><div class=\"wrap reveal\"><p class=\"eyebrow\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2021\/05\/rohrbogen_apple.png\" alt=\"\" width=\"18\" height=\"18\" loading=\"lazy\">References<\/p><h2>In use worldwide<\/h2><p class=\"lead\">Our pipe bends are in use worldwide \u2013 including at:<\/p><\/div><div class=\"marquee\"><ul class=\"marquee-track\"><li>Total S.A.<\/li><li>Siemens<\/li><li>Hitachi Power<\/li><li>Alstom Power<\/li><li>Exxon Mobil Production<\/li><li>Buhlmann Rohr-Fittings-Stahlhandel<\/li><li>STAROFIT Klose GmbH &amp; Co. KG<\/li><li>ThyssenKrupp Schulte GmbH<\/li><li>RFF Rohr Flansch Fittings Handels GmbH<\/li><li>Oschatz GmbH<\/li><li>BHR Engineering &amp; Construction<\/li><li>Piping-Service Steuer Handelsges. mbH<\/li><li aria-hidden=\"true\">Total S.A.<\/li><li aria-hidden=\"true\">Siemens<\/li><li aria-hidden=\"true\">Hitachi Power<\/li><li aria-hidden=\"true\">Alstom Power<\/li><li aria-hidden=\"true\">Exxon Mobil Production<\/li><li aria-hidden=\"true\">Buhlmann Rohr-Fittings-Stahlhandel<\/li><li aria-hidden=\"true\">STAROFIT Klose GmbH &amp; Co. KG<\/li><li aria-hidden=\"true\">ThyssenKrupp Schulte GmbH<\/li><li aria-hidden=\"true\">RFF Rohr Flansch Fittings Handels GmbH<\/li><li aria-hidden=\"true\">Oschatz GmbH<\/li><li aria-hidden=\"true\">BHR Engineering &amp; Construction<\/li><li aria-hidden=\"true\">Piping-Service Steuer Handelsges. mbH<\/li><\/ul><\/div><\/section><section style=\"padding-top:0\"><div class=\"wrap reveal\"><div class=\"cta\"><h2>Request pipe bends<\/h2><p>Send us size, material, standard and quantity \u2013 we will get back to you quickly with a quote.<\/p><div class=\"btns\"><a class=\"btn btn-white\" href=\"https:\/\/www.siekmann-rohrbogen.de\/en\/contact\/\">Go to the request form \u2192<\/a><a class=\"btn btn-ghost\" href=\"tel:+49522349600\">+49 5223 4960-0<\/a><\/div><\/div><\/div><\/section><\/div>\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"inLanguage\": \"en\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is a pipe bend?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A pipe bend is a pipe fitting that changes the direction of a piping system. Pipe bends differ in outside diameter, wall thickness, bending radius, angle and material. They are made either from welded half-shells or from seamless pipe and are used in power plant construction, mechanical engineering, heat exchanger and plant construction, among others.\"}}, {\"@type\": \"Question\", \"name\": \"Which standards apply to pipe bends?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The relevant standards are EN 10253-2 (non-alloy and alloy ferritic steels, current edition DIN EN 10253-2:2026-07, EN 10253-2:2021+A1:2025) and EN 10253-4 (austenitic and duplex steels, current edition DIN EN 10253-4:2025-10). The former German standard DIN 2605 has been replaced by EN 10253. Internationally, the American ASME B16.9 with dimensions in inches and schedules is widely used.\"}}, {\"@type\": \"Question\", \"name\": \"Which bending radii does Siekmann offer?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Siekmann manufactures pipe bends in the standard types 2D, 3D and 5D and in many special radii in between \u2013 up to 219.1 mm outside diameter. On request with bending radius tolerances down to \u00b11 mm (standard: \u00b17 mm to EN 10253-2).\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between Type A and Type B pipe bends?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Type A (reduced pressure factor) has the same wall thickness over the whole bend body as at the weld ends; its internal pressure resistance is below that of a pipe of the same size. Type B (full pressure factor) has an increased wall thickness on the inside of the bend and reaches the full internal pressure resistance of the pipe. Example 76.1 \u00d7 12.5 mm (2D): Type A inner wall 11.0 mm, Type B inner wall 16.8 mm.\"}}, {\"@type\": \"Question\", \"name\": \"Up to which wall thickness does Siekmann manufacture pipe bends?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Siekmann manufactures seamless pipe bends with wall thicknesses from 1 mm to 55 mm (depending on outside diameter) for outside diameters from 13.7 mm to 219.1 mm \u2013 also as small batches or single items.\"}}]}<\/script>\n<script data-no-optimize=\"1\" data-no-defer=\"1\" data-no-minify=\"1\" data-cfasync=\"false\" nowprocket>(function(){var 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Manufactured to EN&nbsp;10253, DIN&nbsp;2605 and ASME&nbsp;B16.9. EN 10253 DIN 2605 ASME B16.9 ISO 9001:2015 \u00b7 T\u00dcV Nord Request a quote \u2192Product range Outside diameter 13.7 \u2013 219.1 mm Wall thickness 1 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"no-sidebar","site-content-layout":"plain-container","ast-site-content-layout":"normal-width-container","site-content-style":"unboxed","site-sidebar-style":"unboxed","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"disabled","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-240","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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