Chinese 
A387 Gr91 (P91) X10CrMoVNb9-1 Alloy Steel Coil for Ultra High Temperature Boiler & Pressure Vessel
- Exceptional ultra-high temperature creep rupture strength, long-term stable performance above 600℃
- Good thermal conductivity and low thermal expansion coefficient, less thermal stress under temperature cycling
- Contains V and Nb alloy elements, refined grain structure for superior high-temperature toughness
- Resistant to high-temperature oxidation and steam corrosion, ideal for power station boiler service
- ASTM & EN standard compliance, full MTC 3.1/3.2 material test report for engineering acceptance
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Product Overview
A387 Gr91 (P91) and X10CrMoVNb9-1 (also known as 12CrMo91) are 9Cr-1Mo-V-Nb ferritic martensitic alloy steel coil. Adding vanadium and niobium precipitates strengthens the matrix, greatly improving high-temperature creep property and oxidation resistance.
Supplied in normalized + tempered heat treatment state. Widely used in ultra-supercritical power plant boilers, main steam pipelines, high-temperature pressure vessels and petrochemical high-temperature reactors. We supply hot rolled alloy steel coil with customizable thickness and width. Each batch will conduct chemical and mechanical testing before shipment, Mill Test Certificate MTC 3.1 or 3.2 can be provided.
Chemical & Mechanical Property Snapshot
Detailed Technical Specifications
Product Comparison Table
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Product Packaging
Secure Export Packaging For Safe Handling And Delivery
FAQs
Yes, A387 Gr91 plate/coil is commonly called P91. It is ASTM grade 9Cr1MoVNb martensitic heat-resistant alloy steel.
They are equivalent materials. A387 Gr91 follows ASTM standard, X10CrMoVNb9-1 is EN standard designation. Chemical composition and mechanical requirements are almost identical, but code approval needs to be confirmed by engineering.
Yes, we can slit coil into narrow strips or cut into flat sheets according to your drawings and size requirements.
Mill Test Certificate (MTC 3.1 or 3.2) with complete chemical composition and mechanical test records for inspection.
Continuous service temperature can reach up to 620℃, widely adopted in ultra-supercritical thermal power units.
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