Pipe fittings for energy and power plant systems
Elbows, tees and special parts for steam, high-pressure and high-temperature lines – in creep-resistant materials up to P91 and P92, heavy-wall and on request to EN 10253-2 Type B. From our own forming production in Unna, Germany.
What do pipe fittings have to withstand in a power plant?
In short: Piping components in power plants must operate reliably for decades under cyclic temperature and pressure loads. What matters is a creep-resistant material, sufficient wall thickness at the highly stressed points and a heat treatment after which the mechanical properties are verifiably met.
Forming, heat treatment and machining take place in our own plants in Unna – on hydraulic presses from 150 to 1,500 t.
Material & heat treatment
- Creep-resistant steels16Mo3, 13CrMo4-5, 10CrMo9-10, P91 and P92 for steam lines and high-temperature zones
- Heat treatmentin our in-house furnace – the mechanical properties are tested and documented within our quality management system
Power plant fittings at a glance
- Standards
- EN 10253-2/-4 (Type A and B), ASME B16.9 · flanges to EN 1092-1 and ASME B16.5
- Codes and standards
- EN 13480, AD 2000, Pressure Equipment Directive 2014/68/EU, ASME B31.1, TRD, VdTÜV data sheets · materials to EN 10028 and EN 10216
- Dimensions
- Elbows up to DN 600 (24"), seamless up to approx. 100 mm wall thickness · tees up to 610 mm outside diameter, wall thicknesses up to 50 mm and more
- Production
- Hot and cold forming, hydroforming, hydraulic presses 150–1,500 t, heat treatment in our in-house furnace, machining
- Materials
- Creep-resistant steels from 16Mo3 to P91 / P92 · stainless steel, duplex, nickel-based, CuNi
- Testing
- NDT (UT, RT, PT, MT), PMI, hardness testing, wall thickness verification for Type B
- Certificates
- EN 10204 3.1 / 3.2 · QMS to DIN EN ISO 9001:2015, manufacturer approval to AD 2000-W0 and the Pressure Equipment Directive
Applications in the power plant
For conventional and renewable power plants – from the main steam line to district heating.
- 01
Main and auxiliary lines
Main and auxiliary piping systems in power plants
- 02
Steam and hot gas
Steam lines and hot gas ducts (HP, IP, LP)
- 03
Combined-cycle plants
Process lines in combined-cycle gas and steam turbine plants
- 04
District heating
District heating and industrial steam systems
- 05
Renewables
Biomass, CSP and geothermal
- 06
Waste-to-energy
Waste incineration and sewage gas
Creep-resistant materials for steam and high-temperature lines
For steam lines we use creep-resistant steels – from 16Mo3 for steam lines up to 530 °C to P91 and P92 for high-efficiency power plants above 600 °C. We manufacture elbows and tees from these to EN 10253-2, including heat treatment and inspection certificates to EN 10204.
Creep-resistant steels
- 16Mo3 / 1.5415
- 13CrMo4-5 / 1.7335 / P11
- 10CrMo9-10 / 1.7380 / P22
- X10CrMoVNb9-1 / 1.4903 / P91
- X10CrWMoVNb9-2 / 1.4901 / P92
- X20CrMoV11-1 / 1.4922
- 15NiCuMoNb5 / 1.6368 / WB36
Unalloyed and low-alloy steels
- P235GH / 1.0345
- P265GH / 1.0425
- P355GH
- P355N / P355NH
Austenitic stainless steels
- 1.4404
- 1.4571
Duplex and super duplex
- 1.4462
- 1.4410
Nickel-based alloys
- Alloy 625 / 2.4856
- Monel 400 / 2.4360
From practice: power plant and high-pressure projects
Two examples from our production in Unna.
Tees in P91 – 323.9 × 50 mm
- Taskhigh-temperature application in a power plant – a combination of size and material that only a few manufacturers in Europe can still produce
- Solutionown hydraulic presses and heat treatment in our in-house facility, manufactured to EN 10253
- Resultall mechanical properties met after heat treatment, delivered on schedule with a 3.1 certificate
Elbows in 5 working days
- Taskfive heavy-wall elbows 219.1 × 40 mm in P355N/NH, outside common stock dimensions
- Solutionsawing, pressing, heat treatment, bevelling, sizing, blasting and coating – all in our own plants in Unna
- Resultdelivered within the required one-week deadline, project delay avoided
Pipe fittings for your power plant project
Tested and documented
Production and testing within our quality management system to DIN EN ISO 9001:2015, with manufacturer approval to AD 2000-W0 and the Pressure Equipment Directive. Every test is documented with a certificate to EN 10204 (3.1 / 3.2).
- Inspection certificate 3.1 / 3.2
- UT · RT · PT · MT
- PMI
- Hardness testing
- Type B wall thickness verification
- Third-party inspection: TÜV, DNV, SGS, ABSA
- Customer inspection during production
More industries and projects
Nirotec supplies pipe fittings for industrial piping systems worldwide – including these industries.
FAQ on power plant fittings
Which pipe fittings does Nirotec supply for power plants?
Elbows, tees, reducers, flanges, pipe caps and special parts and drawing parts – for main and auxiliary lines, steam lines and hot gas ducts, combined-cycle plants, district heating as well as renewable and waste-to-energy plants. We supply from our own forming production and complementary sourcing.
Which creep-resistant materials do you process?
Among others 16Mo3, 13CrMo4-5 (P11), 10CrMo9-10 (P22), P91, P92, X20CrMoV11-1 and 15NiCuMoNb5 (WB36). We manufacture elbows and tees from these including heat treatment and inspection certificates to EN 10204. For an overview, see Materials.
What is the difference between Type A and Type B to EN 10253-2?
Type A is the version with the standard wall thickness according to the standard. Type B has increased minimum wall thicknesses at the most highly stressed points and is therefore designed for high-pressure and high-temperature applications. We provide verification of the t, ts, and tb dimensions with the inspection documentation.
Which dimensions and wall thicknesses are possible?
We manufacture elbows up to DN 600 (24") and seamless up to approx. 100 mm wall thickness, tees up to 610 mm outside diameter and wall thicknesses of 50 mm and more – for example 323.9 × 50 mm in P91.
Which codes do you supply to?
Design is based on EN 13480, AD 2000 and the Pressure Equipment Directive 2014/68/EU, internationally on ASME B31.1; TRD and VdTÜV data sheets apply in addition. We manufacture the fittings to EN 10253 and ASME B16.9; the materials comply with EN 10028 and EN 10216.
How quickly can you deliver?
Small batch sizes and short lead times are possible because forming, heat treatment and machining take place in our own plants in Unna. One example: we completely manufactured five elbows 219.1 × 40 mm in P355N/NH within 5 working days. We will confirm the specific date with our quotation.
Last updated: October 2026
Request your power plant project
Material, dimensions, code and quantity are all we need – or simply send us your drawing or parts list. Heavy-wall designs and creep-resistant special materials too.
