ASME SA387 Grade 91

Where resistance to high temperature and good anti-corrosion characteristics are required, ASME SA387 Grade 91 Class 2 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, SA387 Grade 91 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. 
 

Specifications

Chromium & Molybdenum content (according to the ASME specification)

Designation Nominal Chromium Content (%) Nominal Molybdenum Content (%)
SA387 Grade 91 1.00% 0.50%


Tensile Requirements for Class 2 Plates 

Designation Requirement Grade 12
SA387 Grade 91 Tensile strength, ksi [MPA] 65 to 85 [450 to 585]
Yield strength, min, ksi [MPa]/(0.2% offset) 40 [275]
Elongation in 8 in. [200mm], min % 19
Elongation in 2 in. [50mm], min, % 22
Reduction of area, min % ---


Chemical Requirements 

Element   Chemical Composition (%)
    ASME SA387 Grade 12
Carbon: Heat Analysis 0.05 - 0.17
Product Analysis 0.04 - 0.17
Manganese Heat Analysis: 0.40 - 0.65
Product Analysis 0.35 - 0.73
Phosphorus Heat Analysis 0.035
Product Analysis 0.035
Sulphur (max) Heat Analysis 0.035
Product Analysis 0.035
Silicon Heat Analysis 0.15 - 0.40
Product Analysis 0.13 - 0.45
Chromium: Heat Analysis 0.80 - 1.15
Product Analysis 0.74 - 1.21
Molybdenum Heat Analysis 0.45 - 0.60
Product Analysis 0.40 - 0.65



 

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