Seamless elbows for industrial piping systems
Our seamless elbows are used in industrial piping systems, including power plant construction, the chemical industry, refineries, and apparatus and plant engineering.
We supply elbows to EN 10253-2 in Type A and Type B – for standard applications and applications with increased wall thickness requirements.
Our Manufacturing Competencies
Manufacturing & Properties
Our elbows are manufactured from seamless or welded pipes and hot or cold formed depending on material, dimension, and requirements. Forming is carried out using specially designed press and forming processes that ensure uniform material distribution and high dimensional accuracy. Subsequently, depending on material and application, heat treatment and mechanical processing are performed.
Through controlled manufacturing processes, we achieve high roundness, uniform wall thickness distribution, and reliable tightness of the components.
Typical designs and geometries (independent of standard):
- 45°, 90°, 180°
- Special angles (e.g., 30°, 60°, 120°) on request
- Long Radius (LR) / Short Radius (SR)
- Special radii to customer specification
To ASME B16.9:
- Standardized dimensions for pipe fittings (e.g., elbows, tees, reducers)
- LR / SR designs per standard
To EN 10253:
- Type A (reduced testing requirements)
- Type B (increased testing requirements)
- Form 2 (seamless, without longitudinal weld)
- Form 3 (increased requirements)
Form 5 (special designs)
Special designs:
- Special angles and radii to customer specification
- New die manufacture possible in our own tool shop
- Extended ends (tangents) per drawing
- Heavy-wall designs outside the standard
- Manufacturing to project-specific requirements (e.g., offshore / nuclear)
Type A and Type B to EN 10253-2
EN 10253-2 defines two wall thickness types for seamless elbows – independent of the form (radius).
Nirotec has the manufacturing capability to supply elbows to EN 10253-2 in Type A and Type B – in all common forms (2, 3, 5) and materials. Verification of the tint dimension is documented and provided with the inspection certificates:
Type A – Standard wall thickness
Elbows for general industrial piping applications. The wall thickness meets the standard requirements of the standard.
Type B – Increased wall thickness (tint dimension)
Elbows with increased minimum wall thickness on the elbow intrados. The standard specifies a defined tint dimension for Type B that is significantly above the requirements of Type A.
The tint dimension describes the wall thickness on the elbow intrados after forming. Since the inside is compressed during bending, a change in wall thickness occurs. Type B ensures that the required minimum wall thickness is reliably maintained even after forming.
What Type B means in practice:
- The starting material (pipe) must be considerably thicker than for Type A
- Specially designed dies and forming tools are required
- Not every manufacturer is able to supply Type B
- Result: higher safety margins, better suitability for high pressure and high temperature
Combinations – form and type are independent:
- Form 2 / Type A: Long Radius, standard wall thickness
- Form 2 / Type B: Long Radius, increased wall thickness
- Form 3 / Type A: Short Radius, standard wall thickness
- Form 3 / Type B: Short Radius, increased wall thickness
- Form 5 / Type A: 3D radius, standard wall thickness
- Form 5 / Type B: 3D radius, increased wall thickness
Typical applications for Type B:
- High-pressure and high-temperature lines in power plants
- Nuclear technology – safety-relevant systems (ITNS)
- Plants to AD 2000 or ASME with increased strength requirements
- Project-specific requirements of the client, EPC contractor, or inspection authority
Materials & Standards
Our elbows are manufactured from a wide range of industrial materials. Depending on application, temperature, pressure, and corrosion requirements, we supply components from different material groups.
Additional materials and project-specific material requirements on request.
Unalloyed & low-alloy steels:
P235GH / 1.0345
P265GH / 1.0425
P355GH / 1.0566
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
Heat-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:
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 / 1.4912 / X7CrNiNb18-10 / TP347H / WP347H
310S / 1.4845 / X8CrNi25-21 / TP310S / WP310S
Duplex & 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
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
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 & special materials:
CuNi10Fe1.6Mn / C70600 / 90-10 CuNi
CuNi70/30 / C71500
Zirconium 702 / UNS R60702
Quality Testing & Documentation
Manufacturing and testing within our QM system to ISO 9001 and AD 2000. On request: PMI analyses, material testing, external inspections (TÜV, SGS)
All tests are documented with inspection certificates to EN 10204 (3.1 or 3.2).
Overview of our testing services:
- Visual inspection
- Dimensional control and wall thickness measurement
- Non-destructive testing (UT, RT, PT, MT)
- Verification of tint dimension for Type B elbows
- Positive Material Identification (PMI)
- Hardness testing
- Ferrite measurement for duplex materials
- External inspections by TÜV, Bureau Veritas, or customer inspectors
- Inspection certificates to EN 10204 (3.1 / 3.2)
- Project-specific ITPs with hold and witness points on request
Applications & Industries
In use worldwide
Thanks to their dimensional accuracy and load-bearing capacity, our fittings are ideally suited for pressure, temperature, and corrosion environments with the highest safety requirements.
Energy and Power Plant Facilities
Nuclear Technology
Hydrogen and Energy Infrastructure
Chemical and Process Industry
Refineries and Offshore Facilities
Apparatus and Mechanical Engineering
Looking for a special dimension or special material?
At Nirotec, we also manufacture elbows outside the standard range – heavy-wall, in special materials, with extended straight ends. Contact our sales team directly.