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ASTM A387 GRADE 9 Class 2


A weldable carbon steel plates for pressure vessels and boilers used in elevated temperatures. The material benefits from added chromium and molybdenum which gives the steel greater corrosion resistance and resistance to heat. ASTM A387 GRADE 9 is used by fabricators who serve the oil, gas and petrochemical industry.

ASTM A387 Grade 9 is available ex stock form our UK warehouse and we can dispatch to clients on a global basis. As with all our carbon steel plates, the material comes with mill certification and stampings.

Equivalents for ASTM A387 Grade 9 Alloy Steel Plates

BS EN ASME DIN
... ... A387-9-2 ...

Specifications for ASTM A387 Grade 9 Alloy Steel Plates

Chromium & Molybdenum content (according to the ASME specification)
Designation Nominal Chromium
Content (%)
Nominal Molybdenum
Content (%)
A387 Grade 9 9.00% 1.00%

Tensile Requirements for ASTM A387 Grade 9 Alloy Steel Plates Class 2 Plates

Designation: Requirement: Grade 9
A387 Grade 9 Tensile strength, ksi [MPA] 75 to 100 [515 to 690]
Yield strength, min, ksi [MPa]/(0.2% offset) 45 [310]
Elongation in 8 in. [200mm], min % ...
Elongation in 2 in. [50mm], min, % 18
Reduction of area, min % 45 (measured on round test specimens)
40 (measured on flat test specimen)

Chemical Requirements for ASTM A387 Grade 9 Alloy Steel Plates

Element Chemical Composition (%)
A387 Grade 9
Carbon: Heat Analysis: 0.15 max
Product Analysis: 0.15 max
Manganese: Heat Analysis: 0.30 - 0.60
Product Analysis: 0.25 - 0.66
Phosphorus: Heat Analysis: 0.030
Product Analysis: 0.030
Sulphur (max): Heat Analysis: 0.030
Product Analysis: 0.030
Silicon: Heat Analysis: 1.00 max
Product Analysis: 1.05 max
Chromium: Heat Analysis: 8.00 - 10.00
Product Analysis: 7.90 - 10.10
Molybdenum: Heat Analysis: 0.90 - 1.10
Product Analysis: 0.85 - 1.15
Vanadium: Heat Analysis: 0.04 max
Product Analysis: 0.05 max
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