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ASTM A387 GRADE 11 Class 1


As a pressure vessel grade steel for use in elevated temperature service, 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. Please refer to our technical specifications below for ASTM A387 Grade 11 Class 1...

Equivalents

BS EN ASTM/ASME DIN
621 B ––– A387-11-1 –––

Specifications for ASTM A387 Grade 11 Alloy Steel Plates

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 ASTM A387 Grade 11 Alloy Steel Plates Class 1 Plates

Designation: Requirement: Grade 11
A387 Grade 11 Tensile strength, ksi [MPa] 75 to 100 [515 to 690]
Yield strength, min, ksi [MPa]/(0.2% offset) 43 [310]
Elongation in 8 in. [200mm], min % 18
Elongation in 2 in. [50mm], min, % 22
Reduction of area, min % –––

Chemical Requirements for ASTM A387 Grade 11 Alloy Steel Plates

Element Chemical Composition (%)
A387 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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