Seamless elbows from the manufacturer – Type A & Type B to EN 10253-2
Manufactured in Unna, Germany, to EN 10253-2/-4 and ASME B16.9 – with inspection certificate 3.1 or 3.2.
up to 24"
up to approx.
on request
to EN 10204
Type A or Type B – what is the difference?
In short: Type B has an increased minimum wall thickness at the intrados – the tint dimension. It is reliably maintained after forming and provides additional safety margins at high pressure and high temperature.
Design and type are independent: Nirotec supplies Type A and Type B in designs 2, 3 and 5.
Type A
- Wall thicknessstandard wall thickness to the standard
- Verificationstandard tests
- Applicationgeneral industrial piping
Type B
- Wall thicknessincreased minimum wall thickness at the intrados (tint), thicker starting pipe, dedicated dies
- Verificationadditionally documented tint verification
- Applicationhigh pressure and high temperature, power plants, nuclear technology
Elbows at a glance
- Standards
- EN 10253-2/-4 (designs 2, 3, 5 · Type A and B), ASME B16.9 (LR / SR), EEMUA 234 for nickel alloys
- Angles & radii
- 45° and 90°, custom angles 15–180° · LR 1.5 × DN, SR 1.0 × DN
- Dimensions
- up to DN 600 (24"), seamless up to approx. 100 mm wall thickness
- Manufacturing
- hot and cold forming, presses up to 1,500 t, heat treatment, machining
- Materials
- carbon steel, low-temperature, creep-resistant incl. P91 / P92, stainless steel, duplex / super duplex, nickel alloys, CuNi
- Testing
- NDT (RT, UT, PT, MT), PMI, hardness, ferrite for duplex, tint verification for Type B
- Certificates
- EN 10204 3.1, 3.2 on request · ISO 9001:2015, ISO 19443:2018, CRN (Canada)
- Batch sizes
- small batch sizes, short lead times
Designs & radii
To EN 10253-2/-4 and ASME B16.9 – every design as Type A or Type B, in 45°, 90° and custom angles.
- B2
Design 2
Long elbow, standard requirements
- B3
Design 3
Short elbow, increased requirements
- B5
Design 5
Long elbow, increased requirements
- LR
Long Radius
Bend radius 1.5 × DN – the standard
- SR
Short Radius
Bend radius 1.0 × DN – for tight spaces
Manufacturing & special designs
From seamless or welded pipes, hot or cold formed on presses up to 1,500 t – for uniform wall thickness, high roundness and dimensional accuracy.
- Custom angles & radii
- New dies from our own tool shop
- Extended ends (tangents)
- Heavy-wall beyond the standard
- Offshore & nuclear projects
Materials
All common material groups – matched to temperature, pressure and corrosion. Further materials on request.
Unalloyed and low-alloy steels
- P235GH / 1.0345
- P265GH / 1.0425
- P355N / 1.0562 · P355NH / 1.0565
- L360 / 1.0582 / API 5L X52
- L415 / 1.8972 / API 5L X60
- WPB / A234 WPB / Carbon Steel
- WPHY70 / A860 WPHY70
Low-temperature steels
- WPL3 / A420 WPL3
- WPL6 / A420 WPL6
- LF2 / A350 LF2
- P355NL2
- P460NL2
- 10Ni14
- 12Ni14 / 1.5637
Creep-resistant steels
- 16Mo3 / 1.5415
- WP11 / P11 / 1.7335 / 13CrMo4-5
- WP22 / P22 / 1.7380 / 10CrMo9-10
- WP91 / P91 / 1.4903 / X10CrMoVNb9-1
- WP92 / P92 / 1.4901 / X10CrWMoVNb9-2
- X20 / 1.4922 / X20CrMoV11-1
- WB36 / 1.6368 / 15NiCuMoNb5
Austenitic stainless steels and super-austenitic grades
- 304 / 1.4301 / X5CrNi18-10 / V2A
- 304L / 1.4307 / X2CrNi18-9 / TP304L / WP304L
- 316L / 1.4404 / X2CrNiMo17-12-2 / TP316L / WP316L / V4A
- 316Ti / 1.4571 / X6CrNiMoTi17-12-2 / TP316Ti / WP316Ti
- 321 / 1.4541 / X6CrNiTi18-10 / TP321 / WP321
- 347H / 1.4961 / TP347H / WP347H
- 310S / 1.4845 / X8CrNi25-21 / TP310S / WP310S
- 254SMO / 1.4547 / X1CrNiMoCuN20-18-7 / UNS S31254
- Alloy 926 / 1.4529 / X1NiCrMoCuN25-20-7 / UNS N08926
- 904L / 1.4539 / X1NiCrMoCu25-20-5 / UNS N08904 / 2RK65
Duplex and super duplex
- Duplex / 1.4462 / X2CrNiMoN22-5-3 / UNS S31803 / F51
- Super Duplex / 1.4410 / X2CrNiMoN25-7-4 / UNS S32750 / F53
- Super Duplex / 1.4501 / X2CrNiMoCuWN25-7-4 / UNS S32760 / F55
Nickel alloys
- Monel 400 / 2.4360 / UNS N04400
- Alloy 625 / 2.4856 / UNS N06625 / Inconel 625
- Alloy 825 / 2.4858 / UNS N08825 / Incoloy 825
- Alloy C-276 / 2.4819 / UNS N10276 / Hastelloy C-276
- Alloy 718 / 2.4668 / UNS N07718
- Alloy 800H / 1.4876H / UNS N08810
- Alloy C-22 / 2.4602 / UNS N06022 / Hastelloy C-22
Copper-nickel and special materials
- CuNi10Fe1Mn / 2.0872 / C70600 / CuNi 90/10
- CuNi 70/30 / 2.0882 / C71500
- Zirconium 702 / UNS R60702
Quality testing & documentation
Quality management system to DIN EN ISO 9001 and ISO 19443. Every test is documented with an inspection certificate to EN 10204 (3.1 / 3.2).
- Visual inspection
- Dimensional and wall thickness measurement
- UT · RT · PT · MT
- tint verification (Type B)
- PMI
- Hardness testing
- Ferrite measurement (duplex)
- Third-party inspection: TÜV, BV, customer
- ITP with hold & witness points
In use worldwide
For pressure, temperature and corrosive environments with the highest safety requirements.
Frequently asked questions about elbows
What is the difference between Type A and Type B to EN 10253-2?
Type A is the design with standard wall thickness. Type B has an increased minimum wall thickness at the intrados (tint dimension), which is reliably maintained after forming. This provides higher safety margins – which is why Type B is mainly used in high-pressure and high-temperature piping, in power plants and in nuclear technology.
Which designs and radii are available?
To EN 10253-2/-4 designs 2, 3 and 5, to ASME B16.9 Long Radius (LR, bend radius 1.5 × DN) and Short Radius (SR, 1.0 × DN). Project-specific radii and custom angles from 15° to 180° are manufactured on request.
Up to what size does Nirotec manufacture seamless elbows?
Up to DN 600 (24") and seamless up to approx. 100 mm wall thickness. Heavy-wall designs beyond the standard are possible on request.
Which inspection certificates do I receive?
The standard is the inspection certificate 3.1 to EN 10204 with traceability to the heat. On request you receive 3.2 with inspection by TÜV, SGS, DNV, Lloyd’s Register, Bureau Veritas or your customer representatives – for projects and in nuclear technology with an agreed ITP.
Does Nirotec also supply small quantities and custom angles?
Yes. We also manufacture small batch sizes with short lead times, custom angles from 15° to 180° and extended ends (tangents) to drawing.
What information do you need for a quotation?
Standard / design (e.g. ASME B16.9 LR or EN 10253 design 3), material and any heat requirements, dimensions (DN / NPS, wall thickness or schedule), quantity and requested delivery date as well as the required documentation (3.1 / 3.2, NDT, third-party inspection). Alternatively, simply send us your drawing or bill of materials.
Last updated: October 2026
Request elbows
Standard, material, dimensions and quantity are enough – or simply send us your drawing or bill of materials. Special dimensions and special materials too.
