Creep-resistant boiler steel
X11CrMo9-1 / 1.7386 pressure vessel steel
X11CrMo9-1 is a 9 % chromium boiler steel below P91. W.Nr. 1.7386. A335 P9 is the ASTM name.
- Delivery conditions
- +NT / +QT to standard
- Also known as
- 1.7386, P9, T9
Designations
- W.Nr.
- 1.7386
- EN standard
- X11CrMo9-1
- Group
- Pressure vessel steel
What it is used for
Steam pipe and fittings in the P9 class.
Limits
X10CrMoVNb9-1 when it is P91. X11CrMo5 when 5 % Cr is enough.
Delivery
We source X11CrMo9-1 from European mill partners as round bar, flat bar, square bar, seamless tube, welded tube, cut to your dimensions and ship the certificate with the material. Typical condition: +NT / +QT to standard. From a single cut piece to larger lots — with no minimum charge, so you do not have to buy a full commercial length to get what you need.
Certificates and documentation
X11CrMo9-1 can be supplied with a material certificate to EN 10204, depending on producer, dimension and the requirements specified for the delivery. On pressure-bearing material the certificate is part of the product: standard, condition and tests must be on the enquiry, and 3.2 must be agreed before the material is locked at the mill. EN 10204 3.1 can be supplied on a wide range of our materials — 3.2 and third party by project, when the mill can issue it.
Dimension programme
| Form | Range | Note |
|---|---|---|
| Round bar | Bar to order | When the form is bar, not plate. |
| Seamless tube | Ø6–Ø2000 mm | Seamless DIN/EN. Wall to EN 10220. State DN, wall and 3.1/3.2. |
| Welded tube | Ø6–Ø2000 mm | Welded DIN/EN. Wall to EN 10220. State weld seam and certificate. |
| Fittings | Ø12–Ø2000 mm | ASME 1/2–60″ (Ø15–Ø1524 mm). Type A and B. Not a stock statement. |
| Flanges | Ø14–Ø2000 mm | ASME 1/2–60″ (Ø15–Ø1524 mm). PN 6–400. Not a stock statement. |
The range is a delivery programme, not a stock statement. Length is cut to your drawing.
Read more
Send your enquiry
State grade, dimensions and quantity — or attach a drawing. We reply with a quote.