ASTM A387 Steel

ASTM A387 steel has excellent welding properties and can be welded by manual, automatic or forge welding methods. Gnee can provide ASTM A387 steel in various shapes, such as plate, plate, bar, pipe, forged, strip coil, etc. And Gnee offers 8 grades of ASTM A387 steel. Free factory, low price, free samples provided!

ASTM A387 is a chromium-molybdenum alloy steel specification designed for use in high-temperature applications. The introduction of Chrome increases the material’s temperature tensile strength, making it an excellent choice for high-temperature environments. It is commonly used in pressure vessels, boilers and heat exchangers that need to withstand high temperatures and pressures. A387 combines high temperature strength, toughness and corrosion resistance to meet demanding high temperature service requirements.

ASTM A387 Grade 11: This grade has a composition of 1.25% chromium and 0.50% molybdenum. It is commonly referred to as 1-1/4Cr-1/2Mo steel. Grade 11 steel plates are suitable for use in elevated temperature service up to 600°F (315°C).

Grade 12: This grade has a composition of 1.00% chromium and 0.50% molybdenum. It is commonly referred to as 1Cr-1/2Mo steel. Grade 12 steel plates are also suitable for use in elevated temperature service up to 600°F (315°C).

Grade 22: This grade has a composition of 2.25% chromium and 1.00% molyb

Grade 91: This grade has a composition of 9.00% chromium and 1.00% molybdenum. It is commonly referred to as 9Cr-1Mo steel. Grade 91 steel plates are suitable for use in elevated temperature service up to 1,000°F (540°C).

Thickness: 5 MM – 200 MM

Width: 1220MM – 4200MM

Length: 5000-18000mm

Customize: Available

  • UT (Ultrasonic examination)
  • AR(As Hot Rolled only)
  • TMCP(Thermal Mechanical Control Processing)
  • N(Normalized)
  • Q+T(Quenched and Tempered)
  • Z Direction Test(Z15,Z25,Z35)
  • Charpy V-Notch Impact Test
  • HIC test
  • NDT
  • PWHT( Simulated Post Weld Heat Treatment)
  • NACE0175
  • The Third Party Test (Such as SGS Test)
  • Coated or Shot Blasting and Painting

Available, welcome to consult

A)Packaging Details: Standard export seaworthy packing or as required.
B)Delivery Time:30-50 days, 7 days for stock goods.
C)Loading Port:Shanghai ,Tianjin, Qingdao.
D)Offer Ability:5000MT/Per Month.
E)MOQ:1 Pcs.

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What shapes can it be welded into?

Chemical Composition Of Hot Sale ASTM A387 Steel

A387 Grade 5 Class10.15max0.25-0.660.55max0.0350.03
A387 Grade 5 Class20.15max0.25-0.660.55max0.0350.03
A387 Grade 11 Class10.04-0.170.35-0.730.44-0.860.0350.035
A387 Grade 11 Class20.04-0.170.35-0.730.44-0.860.0350.035
A387 Grade 12 Class10.04-0.170.35-0.730.13-0.450.0350.035
A387 Grade 12 Class20.04-0.170.35-0.730.13-0.450.0350.035
A387 Grade 22 Class10.04-0.150.25-0.660.50max0.0350.035
A387 Grade 22 Class20.04-0.150.25-0.660.50max0.0350.035
GradeTensile Strength(MPa)Yield Strength(MPa)% Elongation in 2 in.(50mm) minImpacting Test  Temperature(°C)
A387 Grade 5 Class1415-58520545-20,40,-60
A387 Grade 5 Class2515-69031045-20,40,-60
A387 Grade 11 Class1415-58524022-20,40,-60
A387 Grade 11 Class2515-69031022-20,40,-60
A387 Grade 12 Class1380-55023022-20,40,-60
A387 Grade 12 Class2450-58527522-20,40,-60
A387 Grade 22 Class1415-58520545-20,40,-60
A387 Grade 22 Class2515-69031045-20,40,-60

Why Choose Gnee ASTM A387 steel

Gnee’s ASTM A387 steel steel is distinguished by its superior quality, performance, and compliance with strict industry standards. At Gnee, we prioritize customer satisfaction and strive to meet our customers’ needs and exceed their expectations. Our ASTM A387 steel steel are manufactured using high-quality materials and advanced production techniques. We employ stringent quality control measures to ensure that each plate meets the highest industry standards. The result is a durable and reliable product that provides long-lasting performance.

And our ASTM A387 steel certified by CE, ISO 9001, AS 9100, SGS, FDA, CE, ABS, BV, CCS, DNV, GL, ASTM, LR, and RINA. We guarantee the highest safety and quality standards. We fulfill all requirements of reputed classification societies.


In addition, our ASTM A387 steel has been successfully exported to more than 60 countries such as Germany, South Korea, the United States, Mexico, and Argentina. Many regular customers come to visit our company and factory and make multiple orders.


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