Pipe bend – made from seamless pipe

special. elbow. production.

Siekmann has been offering elbows made in Germany for decades. Our strength lies in the forming of thick-walled pipe elbows as well as in the area of special pipe elbows. As a manufacturer, we also keep a small stock of blanks. This means that you can obtain elbows at short notice. We can also manufacture new bends in small quantities and within short production times.

Our delivery programme includes seamless pipe bends with thick walls, special materials, special radii and bends with extended legs. We are particularly specialised in the production of pipe bends with full utilisation (type B) according to the standard EN 10253-2 or 10253-4 or part 2 according to DIN 2605. Our products are used in refineries, power plants, oil drilling platforms, heat exchangers, in mechanical engineering and in many other areas.

Product range:

Outer diameter: 14,0 mm – 219,1 mm
Wall thickness: depending on outer diameter from 1 mm to 50 mm
Angle: depending on dimension 7° to 180
Type: Type 2D, 3D, 5D, long radius (LR), short radius (SR) – further bending diameters can be found under Bending Diameter
Standards: EN10253 type A and B, DIN 2605 part 1 and 2, ASME B16.9, production according to customer specifications,
Tolerances: In general, we manufacture according to the common tolerances of the pipe bend standards. However, it often happens that we manufacture elbows with tighter tolerances. Here we have possibilities, for example, to produce the pipe bend with a bending diameter of +/- 1mm.

We supply fittings made of carbon steel, high alloy steel or stainless steel. Our extensive experience also in terms of heat treatment gives us the possibility to form a wide range of materials. A list of materials can be found in the materials section.

Our production is subject to strict quality controls. During the manufacturing process, dimensional checks are carried out to detect defects at an early stage. Our company is monitored by TÜV Nord and is ISO9001:2015 certified.

What is a pipe bend?

What is a pipe bend?

A pipe bend is a pipe fitting that has the purpose of changing the direction of piping systems. There are different types of pipe bends. They differ in outer diameter, wall thickness, bending diameter, angle and material. In addition, a distinction is made between welded elbows made of half-shells and elbows made of seamless pipe. Elbows are used in power plant construction, mechanical engineering, heat exchanger and plant construction etc….

Portfolio

Materials for pipe bends

Over the years, we have been able to gather a wide range of experience in the field of tube forming. Carbon steels, high-alloy steels and stainless steels are among our processing materials. Below you will find a list of the materials from which we can manufacture elbows:

EN / DIN()

• P235GHTC1/2 (St 35.8 I/ III), P265GH, S355J2H

• 16Mo3 (15Mo3), 10CrMo9-10 (10CrMo910), 13CrMo4-5 (13CrMo44)

• X11CrMo5, X11CrMo9-1, X20CrMOV11-1, X10CrMoVNb9-1, X10CrWMoVNb9-2, 7CrMoVTiB10-10

• P215NL (TTST35N/V), 12Ni14 (10Ni14)

• P355N (StE355), P355NH (WStE355), P355NL1 (TStE355), P355NL2

• L290NB (StE 290.7), L360NB (StE 360.7)

• 1.4301, 1.4306, 1.4362 (Lean Duplex), 1.4401, 1.4404, 1.4435, 1.4436, 1.4439, 1.4462 (Duplex), 1.4466 (Super Duplex), 1.4501, 1.4539, 1.4541, 1.4550, 1.4571 1.4841, 1.4878, , 1.4876, 1.4952, 1.4835, 1.4877, 1.4910

ASME

• WPA, WPB, WPC, WP1, WP5, WP9, WP11, WP12, WP22, WP32/27, WP91, WP92, WP304, WP304 H, WP304L, WP310, WP316, WP316L, WP316TI, WP321, WP347, WP347H

• WPL 3, WPL6, X42, X52, WPHY52, WPHY60

• S30815, S31000, S31050, S31500, S31726, S31803, S32760, N08904

• Alloy 800H, DMV310N

Standards for fittings and pipe bends

In the area of fittings and pipe bends, various standards are valid and are applied by us. However, we are also happy to manufacture our fittings according to customer specifications.

This is the current standard for fittings for welding in unalloyed and alloyed ferritic steels with special test requirements. Several DIN standards for different fittings have been combined into one European standard. For us, the pipe bend part is decisive here. We deliver according to the types 2D, 3D, 5D and also many special radii in between. EN 10253-2 also includes a part for elbows with full utilisation (type B). “Type B” elbows have a significantly increased wall thickness on the inside of the elbow compared to the wall thickness at the welding ends, as the inside of the elbow is the most heavily stressed area of an elbow.

This standard deals with fittings for welding in austenitic and austenitic-ferritic (duplex) steels with special test requirements. For the most part, this standard corresponds to EN 10253-2. Here, however, there are, for example, occasionally different bending radii compared to EN10253-2. Our team will be happy to inform you about the differences.

DIN 2605 is the former pipe bend standard that has now been replaced by EN10253. Here, different wall thicknesses apply to the elbows with full utilisation compared to the new standards. This standard is also not as comprehensive as EN10253 and only includes a section on elbows and no other fittings.

This standard contains all technical delivery conditions for fittings manufactured according to the ASME standard. Among other things, there is also a part for elbows.