Chrome Molybdenum Steel – ASTM A387 Grade 22 Class 2

The A387 Grade 22 Class 2 – a grade of chromium-molybdenum alloy – is mainly intended for use in pressure vessels and welded boilers, which are designed for use in elevated temperature service.

This steel grade has excellent heat resistance and anti corrosive/oxidation qualities, and is perfect for using in the oil, gas and chemical industry.

Equivalents

BS EN ASTM/ASME DIN
622-515B 10CrMo910 A/SA387-22-2 10CrMo910

Chromium & Molybdenum content (according to the ASTM specification):

Designation Nominal Chromium Content (%) Nominal Molybdenum Content (%)
A387 Grade 22 2.25% 1.00%

Tensile Requirements for Class 2 Plates

Designation Requirement Grade 22
A387 Grade 22 Tensile strength, ksi [MPA] 75 to 100 [515 to 690]
Yield strength, min, ksi [MPa]/(0.2% offset) 45 [310]
Elongation in 8 in. [200 mm], min %
Elongation in 2 in. [50 mm], min, % 18
Reduction of area, min % 45 (measured on round specimen)
40 (measured on flat specimen)

Chemical Requirements

. .
Carbon (C) %
Heat Analysis:
Product Analysis:
0.05 - 0.15
0.04 - 0.15
Manganese (Mn) %
Heat Analysis:
Product Analysis:
0.30 - 0.60
0.25 - 0.66
Phosphorus (P) %
Heat Analysis:
Product Analysis:
0.035
0.035
Sulphur (S) (Max) %
Heat Analysis:
Product Analysis:
0.035
0.035
Silicon (Si) %
Heat Analysis:
Product Analysis:
0.50 max
0.50 max
Chromium (Cr) %
Heat Analysis:
Product Analysis:
2.00 - 2.50
1.88 - 2.62
Molybdenum (Mo) %
Heat Analysis:
Product Analysis:
0.90 - 1.10
0.85 - 1.15

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