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ASME SA 387 GRADE 12 Class 2


Engineered for use in elevated temperature service, is a chrome molybdenum carbon alloy steel for use in weldable pressure vessels and industrial boilers.

The material benefits from added chromium which provides excellent corrosion and oxidation resistance making it ideal for sour service applications in the oil and gas industry.

Equivalents

BS EN ASTM/ASME DIN
620 B 13 CRMO 45 SA387-12-2 13 CRMO 44

Specifications for ASME SA387 Grade 12 Alloy Steel Plates

Chromium & Molybdenum content (according to the ASME specification)
Designation Nominal Chromium
Content (%)
Nominal Molybdenum
Content (%)
SA387 Grade 12 1.00% 0.50%

Tensile Requirements for ASME SA387 Grade 12 Alloy Steel Plates Class 2 Plates

Designation: Requirement: Grade 12
SA387 Grade 12 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 for ASME SA387 Grade 12 Alloy Steel Plates

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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