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ASTM A387 GRADE 91 Class 1


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, ASTM A387 GRADE 91 Class 1 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 ASTM A387 Grade 91 Alloy Steel Plates

BS EN ASTM/ASME DIN
... ... A387-91-1 ...

Specifications for ASTM A387 Grade 91 Alloy Steel Plates

Chromium & Molybdenum content (according to the ASME specification)
Designation Nominal Chromium
Content (%)
Nominal Molybdenum
Content (%)
A387 Grade 91 9.00% 1.00%

Tensile Requirements for ASTM A387 Grade 91 Alloy Steel Plates Class 1 Plates

Designation: Requirement: Grade 91
A387 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 ASTM A387 Grade 91 Alloy Steel Plates

Element Chemical Composition (%).
A387 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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