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ASME SA 387 GRADE 91 Class 2


Where resistance to high temperature and good anti-corrosion characteristics are required, is a carbon alloy steel plate is a material to consider. It is a pressure vessel grade steel which is used commonly by fabricators who supply the oil and gas industry.

Due to the materials excellent corrosion resistant properties, ASME SA 387 GRADE 91 Class 2 is also an option for use in sour service environments. The material has good weldability and with its heat resistant qualities, the material is a highly versatile steel which can be used in numerous applications.

Equivalents for ASME SA387 Grade 91 Alloy Steel Plates

BS EN ASTM/ASME DIN
... ... SA387-91-2 ...

Specifications for ASME SA387 Grade 91 Alloy Steel Plates

Chromium & Molybdenum content (according to the ASME specification)
Designation Nominal Chromium
Content (%)
Nominal Molybdenum
Content (%)
SA387 Grade 91 9.00% 1.00%

Tensile Requirements for ASME SA387 Grade 91 Alloy Steel Plates Class 2 Plates

Designation: Requirement: Grade 91
SA387 Grade 91 Tensile strength, ksi [MPA] 85 to 110 [585 to 760]
  Yield strength, min, ksi [MPa]/(0.2% offset) 60 [415]
  Elongation in 8 in. [200mm], min % ...
  Elongation in 2 in. [50mm], min, % 18
  Reduction of area, min % ...

Chemical Requirements for ASME SA387 Grade 91 Alloy Steel Plates

Element Chemical Composition (%).
SA387 Grade 91
Carbon: Heat Analysis: 0.08 - 0.12
Product Analysis: 0.06 - 0.15
Manganese: Heat Analysis: 0.30 - 0.60
Product Analysis: 0.25 - 0.66
Phosphorus: Heat Analysis: 0.020
Product Analysis: 0.025
Sulphur (max): Heat Analysis: 0.010
Product Analysis: 0.012
Silicon: Heat Analysis: 0.20 - 0.50
Product Analysis: 0.18 - 0.56
Chromium: Heat Analysis: 8.00 - 9.50
Product Analysis: 7.90 - 9.60
Molybdenum: Heat Analysis: 0.85 - 1.05
Product Analysis: 0.80 - 1.10
Nickel, max: Heat Analysis: 0.40
Product Analysis: 0.43
Vanadium: Heat Analysis: 0.18 - 0.25
Product Analysis: 0.16 - 0.27
Columbium: Heat Analysis: 0.06 - 0.10
Product Analysis: 0.05 - 0.11
Nitrogen: Heat Analysis: 0.030 - 0.070
Product Analysis: 0.025 - 0.080
Aluminium: Heat Analysis: 0.02
Product Analysis: 0.02
Titanium: Heat Analysis: 0.01
Product Analysis: 0.01
Zirconium: Heat Analysis: 0.01
Product Analysis: 0.01
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