P91 pipes – 1.4903 boiler tubes EN 10216-2
X10CrMoVNb9-1 – short P91 – is a high-temperature 9 % chromium steel for modern power plants with the highest steam parameters (up to ~620 °C). ROHRLINE supplies P91 pipes and tubes to EN 10216-2 with EN 10204 3.1 inspection certificates – worldwide.
Application & properties
X10CrMoVNb9-1 – short P91 – is a high-temperature 9 % chromium steel for modern power plants with the highest steam parameters (up to ~620 °C).
- Main-steam and live-steam lines
- Superheaters and headers in high-performance boilers
- Power plant new-build and retrofit
Tell us the medium, temperature and pressure – we will check the grade with you.
Chemical composition
Typical values in wt.-% per EN standard (heat analysis).
| Element | Content (%) |
|---|---|
| C | 0.08–0.12 |
| Si | 0.20–0.50 |
| Mn | 0.30–0.60 |
| Cr | 8.00–9.50 |
| Mo | 0.85–1.05 |
| V | 0.18–0.25 |
| Nb | 0.06–0.10 |
| N | 0.03–0.07 |
Mechanical properties
Typical values at room temperature per EN standard.
| Property | Value |
|---|---|
| Yield strength Rp0.2 | ≥ 450 MPa |
| Tensile strength Rm | 630–830 MPa |
| Elongation A | ≥ 19 % |
| Impact energy KV | ≥ 40 J |
Standards, equivalents & product forms
| Topic | Detail |
|---|---|
| Standards | EN 10216-2 |
| ASME/ASTM equivalent | ~ ASTM A335 P91 · A182 F91 |
| Material no. | 1.4903 |
| Short name / aka | P91 · A335 P91 |
We supply X10CrMoVNb9-1 (P91) as pipes, flanges and fittings – seamless, on request with an EN 10204 3.1 / 3.2 mill certificate.
Supply programme & machining
| Item | Details |
|---|---|
| Dimensions (pipe) | Programme range: outside Ø 10.2 to 2,032 mm · DN 6 to DN 2000 · all standard wall thicknesses; available sizes depend on grade and standard |
| As flange & fitting | DN 10 to DN 1200 · PN 6 to PN 400 · Class 150 to Class 2500 to ASME B16.5 (to NPS 24), above that ASME B16.47 to Class 900 |
| Lengths & cutting | Mill lengths, sawn fixed lengths and fitting pieces from 0.1 to 12 m – sawn and bevelled |
| Minimum quantity | From a single item – from one fitting piece to the complete piping system |
| Availability | Common grades and sizes available at short notice, special sizes procured per project |
| Lead time | Standard sizes usually 3–5 working days; the binding date is confirmed with the quote |
| Machining | Sawing and bevelling, roll grooving for grooved couplings, threading to EN 10226, drilling, facing, bending with special radii |
| Surface | Blasting Sa 2½, primer and top coat, powder coating in RAL shades, galvanising to EN ISO 1461, PE coating to DIN 30670 |
| Certificates | Mill certificate 2.2, inspection certificate 3.1 to EN 10204 (standard with machining), 3.2 with notified body on request |
| Testing | Non-destructive testing by ultrasound, eddy current and X-ray, pressure test report on request |
These figures describe our supply programme. Which size is actually available in this grade is clarified with your enquiry – you usually receive the quote the same day.
We clarify availability, price and inspection certificate with your enquiry.
Frequently asked questions about X10CrMoVNb9-1 (P91)
What does P91 stand for?
P91 is the common ASTM short designation for the high-temperature steel X10CrMoVNb9-1 (1.4903).
Why P91 instead of 10CrMo9-10?
P91 withstands higher temperatures and pressures (up to ~620 °C) and allows thinner walls – ideal for modern high-performance boilers.
Is P91 demanding to process?
Yes – precisely controlled preheating and post-weld heat treatment are mandatory.
Which dimensions and certificates does ROHRLINE supply for P91?
ROHRLINE supplies P91 in the following range: Programme range: outside Ø 10.2 to 2,032 mm · DN 6 to DN 2000 · all standard wall thicknesses; available sizes depend on grade and standard. Documentation: Mill certificate 2.2, inspection certificate 3.1 to EN 10204 (standard with machining), 3.2 with notified body on request. Delivery worldwide; the binding date is confirmed with the quotation.
Components in P91 pipes
We supply these ready-to-install parts in this grade – to your drawing, tested and documented.
Pipe spools (prefabricated piping assemblies) are piping sections…
Headers bring steam, water or gas together and distribute it again. We…
Bent tube strings for the hottest part of the boiler
Boiler tubes rarely arrive on site in mill lengths. We supply them…
Spare parts for steam, hot-water and heat recovery boilers
Special flanges, collars and pipe fittings to drawing and works…
Typical industries
Request X10CrMoVNb9-1 (P91)?
Grade, standard, size, pressure rating and quantity are enough – on request with an EN 10204 3.1 / 3.2 mill certificate. Your quote usually the same day.
All data are typical values per the relevant EN standards for first orientation – without warranty. The applicable standard and the mill certificate of the delivery are decisive.