SA387/ASTM A387 GR 12 CLASS 2
Engineered for use in elevated temperature service, ASTM A387 / ASME SA387 Grade 12 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...
Engineered for use in elevated temperature service, ASTM A387 / ASME SA387 Grade 12 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.
A387 Grade 12 Class 2 is a high quality chrome molybdenum steel which is ideal for elevated temperature service and offers excellent anti corrosion characteristics.
The steel has a wide range of uses including industrial boilers and pressure vessels, especially in environments where high temperature levels are common.
Chromium & Molybdenum content (according to the ASTM specification):
Nominal Chromium Content (%)
Nominal Molybdenum Content (%)
A387 Grade 12
Tensile Requirements for Class 2 Plates
A387 Grade 12
Tensile strength, ksi [MPA]
65 to 85 [450 to 585]
Yield strength, min, ksi [MPa]/(0.2% offset)
Elongation in 8 in. [200mm], min %
Elongation in 2 in. [50mm], min, %
Reduction of area, min %
0.05 - 0.17
0.40 - 0.65
Sulphur (S) (Max)
0.15 - 0.40
0.80 - 1.15
0.45 - 0.60
Recommended Testing Procedures for Chromium Molybdenum Steel
The following requirements and testing procedures (which are not mandatory) are considered suitable for Chromium Molybdenum steel:
· Vacuum treatment
· Product Analysis
· Additional Tension Test
· Charpy V-Notch Impact Test
· Drop Weight Test
· High Temperature Tension Test
· Ultrasonic Examination
· Magnetic Particle Examination
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