ASME SA387 Grade 11 Class 2

As a pressure vessel grade steel for use in elevated temperature service, ASME SA387 Grade 11 Class 2 is used in a variety of industries and is highly effective, particularly in the oil, gas and petrochemical industry, where liquids and gases are often stored at higher temperatures. The higher levels of chromium also provide excellent corrosion and oxidation resistance, which is a must in sour gas applications. 

Specifications

Chromium & Molybdenum content (according to the ASME specification)

Designation Nominal Chromium Content (%) Nominal Molybdenum Content (%)
A387 Grade 11 1.25% 0.50%


Tensile Requirements for Class 2 Plates 

Designation Requirement Grade 9
SA387 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 % 18
Elongation in 2 in. [50mm], min, % 22
Reduction of area, min % ---


Chemical Requirements 

Element   Chemical Composition (%)
    SA 387 Grade 11
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 0.50 - 0.80
Product Analysis 0.44 - 0.86
Chromium: Heat Analysis 1.00 - 1.50
Product Analysis 0.94 - 1.56
Molybdenum Heat Analysis 0.45 - 0.65
Product Analysis 0.45 - 0.70




 

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