EN 10028-2 X10CrMoVNb9-1 Steel Plate | P91 9Cr-1Mo-V Vessel Plate

X10CrMoVNb9-1 is the 9Cr-1Mo-V grade in EN 10028-2. Buyers almost never type the full EN name first. They type P91 steel plate, P91, X10CrMoVNb9-1, 1.4903, P91 9Cr-1Mo-V vessel plate and EN 10028-2 X10CrMoVNb9-1. All of those names belong on this page. P91 is the ASME / market name. X10CrMoVNb9-1 is the EN steel name. 1.4903 is the steel number.

This is not 10CrMo9-10. 10CrMo9-10 is 2.25Cr-1Mo. This is not 13CrMo4-5. 13CrMo4-5 is 1.25Cr-0.5Mo. This is not P355GH carbon plate. Chromium sits at 8.00–9.50%. Vanadium and niobium are mandatory. Nitrogen is controlled. That chemistry is why P91 holds strength at high steam temperature and why welding and PWHT cannot be copied from a Grade 22 procedure.

Yield on the EN plate table is in the 450 MPa class at the usual thickness band. Tensile is 630–850 MPa. ASME SA-387 Grade 91 Class 2 uses 415 MPa min yield and 585–760 MPa tensile. Those two books are close, not identical. Dual marking is possible only when both books are fully met. Delivery is usually normalized and tempered. Some mill routes use quench and temper. Write the route on the order. SHH STEEL is a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) for this grade.

Do not ship SA387 Grade 22 Class 2 against a P91 drawing. Grade 22 is 2.25Cr-1Mo. Do not ship SA387 Grade 9 Class 2 and call 9Cr without vanadium-niobium control the same as X10CrMoVNb9-1. The ASME page that matches this grade is SA387 Grade 91 Class 2. The next 9Cr family name is SA387 Grade 911 Class 2. Dual marking is possible only when chemistry, tensile, hardness, impact and heat treatment all fit.

Company scope: China steel mill agent SHH STEEL.

This plate sits in pressure vessel steel plates. Cr-Mo and 9Cr comparisons belong on ASME SA387. Quenched-and-tempered Cr-Mo-V comparisons belong on ASME SA542 and ASME SA832.

Cast analysis follows EN 10028-2 Table 1. Product analysis follows EN 10028-1 when ordered. Buyers who search P91 chemical composition, X10CrMoVNb9-1 chemistry and 1.4903 composition want this table, not a Grade 22 table.

Cast Analysis and Product Analysis — EN 10028-2 X10CrMoVNb9-1 (1.4903)

Carbon is tight. Sulfur is very tight. Nitrogen is not a residual to ignore. Niobium and vanadium are not optional extras. If a mill certificate shows 2.25% Cr and no Nb-V-N control, that plate is not X10CrMoVNb9-1. SHH STEEL reports cast analysis on every certificate and product analysis when ordered. Density is about 7.76–7.80 g/cm³. Use the mill certificate weight for vessel calculation.

Buyers search P91 mechanical properties, X10CrMoVNb9-1 yield strength and P91 tensile strength. EN values and ASME Grade 91 Class 2 values sit in the same family. They are not copy-paste identical. Write the book you need.

Tensile and Yield — EN 10028-2 X10CrMoVNb9-1 / P91

Impact is often specified at 20 °C or 0 °C, and some files ask −20 °C. Do not assume 27 J at −20 °C unless the order writes it. Hardness after heat treatment is part of production control because P91 is sensitive to under-tempering and over-tempering.

Do not quote 450 MPa yield on every thickness and every book. Do not treat 630–850 MPa tensile as permission to stamp SA387 Grade 91 Class 2 without checking both tables.

Search habits mix P91 equivalent, X10CrMoVNb9-1 equivalent, 1.4903 equivalent and P91 vs SA387 Grade 91. Those names help a buyer find the right page. They do not authorize substitution.

Buyers pick X10CrMoVNb9-1 / P91 for high-temperature steam, header-adjacent shells, superheater-related vessels and PED equipment that names 9Cr-1Mo-V plate. Search phrases such as P91 boiler plate, P91 pressure vessel plate, X10CrMoVNb9-1 steel plate and 1.4903 steel plate all point here.

This grade exists because 2.25Cr-1Mo runs out of strength at higher steam temperature. That does not mean P91 replaces every Grade 22 file. A hydroprocessing vessel written to SA387 Grade 22 Class 2 still wants Grade 22 unless the designer changes the book. A carbon file written to SA516 Grade 70 does not become P91 by raising temperature on a spreadsheet.

An ASME file that wants P91 plate should name SA-387 Grade 91 Class 2 on ASME SA387 and then write extras. Dual marking EN + ASME is possible only when both books are met. SHH STEEL supplies this plate to fabricators in the United States, Mexico, South America, Europe, the Middle East, Africa and Asia.

X10CrMoVNb9-1 / P91 is not a Grade 22 weld. Treat welding as production welding, and as PED / ASME Code welding when the equipment is a vessel.

Qualify to the applicable code. ASME dual-name work uses ASME Section IX. Consumables must be P91 matching consumables, not Grade 22 and not carbon. Preheat, interpass, hydrogen control and PWHT window are part of the procedure, not optional workshop habit. Under-matched PWHT leaves hardness high. Over-tempering drops strength. A procedure written for SA387 Grade 22 Class 2 is the wrong family. A procedure written for SA387 Grade 9 Class 2 is not automatically valid either. The fabricator owns the WPS. SHH STEEL can share mill heat data for that review.

Usual delivery from SHH STEEL is normalized and tempered EN 10028-2 X10CrMoVNb9-1. Some mills deliver quench and temper. Buyers who search P91 heat treatment, P91 NT or X10CrMoVNb9-1 PWHT are asking for this control, not a generic +N carbon route.

If the vessel will see PWHT, say so. Test coupons then follow a simulated cycle in the agreed temperature window. Extra simulation, hardness mapping, 3.2 hold points or special NDE add time. Plan about two months when those extras are on the order.

The certificate lists EN 10028-2 X10CrMoVNb9-1; P91 when dual-named; 1.4903; heat number; cast analysis including N, Nb and V; product analysis when ordered; tensile to the correct book; +NT or QT; hardness; impact when ordered; elevated-temperature values when ordered. Certificates may be EN 10204 3.1 or EN 10204 3.2.

Usual supply range from SHH STEEL for P91 9Cr-1Mo-V vessel plate:

• Thickness: commonly 6 mm – 100 mm, thicker by mill agreement
• Width: 1500 mm – 3500 mm
• Length: 3000 mm – 12000 mm

2.25Cr-1Mo plate belongs on 12Cr2Mo1R steel plate. 1Cr-0.5Mo plate belongs on 15CrMoR steel plate. Carbon vessel plate belongs on Q345R steel plate.

Dimensional limits follow EN 10028-1 and EN 10029 unless the order names another tolerance table. Do not apply ASTM A36 structural tolerances to a PED or ASME 9Cr vessel plate without writing them.

Charpy details. Temperature, energy, location and orientation. Do not assume −20 °C.

Hardness. After heat treatment and after simulated PWHT when written.

Product analysis. Add this when the destination file wants finished-plate chemistry, especially N, Nb and V.

Elevated-temperature proof strength. Add this when the calculation uses design temperature.

Simulated PWHT. Almost always relevant on P91 equipment.

NDE. EN 10160 or the named UT class.

Third-party. EN 10204 3.2 when written.

SHH STEEL is a global steel mill sourcing partner with mill partnerships in China. We supply ASTM, ASME, EN, DIN, JIS and GB steel to buyers outside a single region. Origin is mill-direct, China origin.

SHH STEEL has supplied steel plates to the USA, Mexico, Argentina, Peru, El Salvador, Spain, Netherlands, Germany, UAE, Saudi Arabia, South Africa, India, Thailand, Singapore, Vietnam, the Philippines, Japan and Korea.

Typical trade terms on this grade: FOB Shanghai, plus CIF to European, American, Middle East and Asian ports as the buyer names them.

Typical lead time:

• Ex-stock: about 5–7 days when 9Cr plate is in yard
• Mill rolling, standard +NT: about 45 days
• Simulated PWHT, hardness, 3.2 or extra NDE: about 2 months

SHH STEEL is a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin). On EN 10028-2 X10CrMoVNb9-1 / P91 that means mill pricing, 1.4903 chemistry reported as cast analysis and as product analysis when ordered, N-Nb-V shown on the certificate, recorded +NT or QT, tensile results to the correct book, hardness control, 3.1 as standard and 3.2 when specified.

We keep the grade on the order. P91 is not 10CrMo9-10. P91 is not SA387 Grade 22 Class 2. P91 is not Q345R steel plate. If the drawing says Grade 22, we will not ship P91 and call 9Cr better. If the drawing says P91, we will not ship Grade 9 or Grade 22 and call chromium close.

Company scope: China steel mill agent SHH STEEL.

EN 10028-2 X10CrMoVNb9-1 Steel Plate is European 9Cr-1Mo-V high-temperature pressure-vessel plate, steel number 1.4903, market name P91, at the 450 MPa yield class and 630–850 MPa tensile, usually +NT. Whether the inquiry says EN 10028-2 X10CrMoVNb9-1, 1.4903, P91 steel plate or P91 9Cr-1Mo-V Vessel Plate, SHH STEEL as a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) supplies plate with X10CrMoVNb9-1 chemistry, heat and product analysis when ordered, recorded heat treatment, hardness control, and EN 10204 3.1 or 3.2 certification.

SHH STEEL supplies EN 10028-2 X10CrMoVNb9-1 P91 9Cr-1Mo-V Vessel Plate to the USA, Mexico, South America, Europe, the Middle East, Africa and Asia for work that actually names this grade.

Contact SHH STEEL for mill rolling, stock inquiry, +NT, simulated PWHT, 3.2 inspection or a quotation.

EN 10028-2 X10CrMoVNb9-1 Steel Plate, P91 9Cr-1Mo-V vessel plate, 1.4903, P91 supplier, global steel mill sourcing partner SHH STEEL