SA387GR91 Steel Plate|ASME SA387 Grade 91 Class 2 Supplier

SA387GR91 Steel Plate – ASME SA387 Grade 91 Class 2

Gangsteel is a professional manufacturer and exporter of SA387GR91 steel plate (ASME SA387 Grade 91 Class 2), specialized in supplying high-temperature alloy steel plates for pressure vessels, boilers, and power generation equipment. With over 15 years of experience in Cr-Mo alloy steel, we understand the strict requirements of Grade 91 in ultra-high temperature service.

Why Choose SA387 Grade 91?SA387GR91 (also known as 9Cr-1Mo-V-Nb) is a premium chrome-molybdenum-vanadium alloy steel designed for service temperatures up to 600°C. Compared with lower grades such as SA387 Gr11 or Gr22, Grade 91 offers significantly better creep strength, oxidation resistance, and long-term high-temperature performance, making it the preferred material for modern supercritical and ultra-supercritical power plants.

Chemical Composition (Heat Analysis, %)

Mechanical Properties (Class 2)

• Tensile Strength: 585 - 760 MPa (85 - 110 ksi)
• Yield Strength (0.2% offset): ≥ 415 MPa (60 ksi)
• Elongation in 50mm: ≥ 18%
• Reduction of Area: ≥ 45%

Main Applications

• Supercritical boiler headers and steam pipes
• Pressure vessels in power generation and petrochemical industry
• Hydrogen service equipment
• High-temperature heat exchangers

Gangsteel Advantages – Why Buy from Us?

• Direct mill supply with EN 10204 3.1 / 3.2 certification
• 100% ultrasonic testing (UT) and hardness testing
• Normalized + Tempered heat treatment according to ASME standards
• Large stock availability for common thicknesses 6mm – 150mm
• Competitive pricing with fast delivery (7-30 days)
• Professional technical support for material selection and welding guidance

As an experienced SA387GR91 steel plate supplier, Gangsteel has successfully delivered thousands of tons to power plant projects in Southeast Asia, Middle East, and Europe. Our strict quality control ensures every plate meets or exceeds ASME SA387 / ASTM A387 requirements.

Request a Quote TodayIf you need SA387GR91 Class 1 or Class 2 steel plates with specific thickness, width, or length, please contact Gangsteel now. We provide mill test certificates, chemical analysis reports, and mechanical test data for every order.