SA387GR9 Steel Plate | ASME SA387 Grade 9 Class 1 & Class 2 S

SA387GR9 Steel Plate | ASME SA387 Grade 9 Class 1 & Class 2 Supplier – Gangsteel

Gangsteel is a professional manufacturer and exporter of SA387GR9 Steel Plate (ASME SA387 Grade 9). With more than 15 years of experience in 9Cr-1Mo alloy steels, we supply both Class 1 and Class 2 SA387 Gr9 plates to power plants, petrochemical refineries, and high-temperature pressure vessel projects worldwide. SA387GR9 offers superior high-temperature strength and oxidation resistance compared to lower chromium grades.

What Is SA387GR9 Steel Plate?

SA387GR9 is a 9% chromium and 1% molybdenum alloy steel plate designed for high-temperature service. It provides excellent creep resistance and oxidation resistance at temperatures up to 590°C. This grade is widely used in modern power plants and petrochemical equipment where higher performance than SA387GR11 or SA387GR22 is required.

Chemical Composition (Heat Analysis, %)

Gangsteel produces SA387GR9 strictly according to ASME SA387 specifications. Full chemical analysis reports are provided with every shipment.

Mechanical Properties

Class 1 (Normalized + Tempered)

• Tensile Strength: 415 – 585 MPa
• Yield Strength: ≥ 205 MPa
• Elongation in 50 mm: ≥ 18%

Class 2 (Normalized + Tempered)

• Tensile Strength: 515 – 690 MPa
• Yield Strength: ≥ 310 MPa
• Elongation in 50 mm: ≥ 18%

Equivalent Material Table

Main Applications

SA387GR9 Steel Plate is commonly used in the following equipment:

• Supercritical and ultra-supercritical boiler components
• High-temperature steam pipes and headers
• Petrochemical hydrocracking reactors
• High-temperature heat exchangers
• Power generation equipment operating above 550°C

Why Choose Gangsteel SA387GR9?

• Direct mill production with full EN 10204 3.1 / 3.2 certification
• 100% ultrasonic testing (UT) performed on every plate
• Available in both Class 1 and Class 2 heat treatment conditions
• Thickness range from 6 mm to 150 mm with regular stock availability
• Competitive pricing and reliable delivery schedule (7–30 days)
• Professional technical support for material selection and welding procedures

Real Supply Experience

In 2025, Gangsteel supplied more than 720 tons of SA387GR9 plates to a supercritical power plant project in the Middle East. The material was used for high-temperature superheater headers and main steam pipes. All plates passed third-party inspection, and the customer praised the excellent creep resistance and stable performance at elevated temperatures.

Request a Quote

If you need SA387GR9 steel plates in specific thickness, width, length, or require Class 1 or Class 2 condition, contact Gangsteel today. We will provide a formal quotation with complete mill test certificates and technical data within 24 hours.

Keywords:SA387GR9 Steel Plate, ASME SA387 Grade 9, 9Cr-1Mo Alloy Steel Plate