ASTM A387 Grade 22 Class 2

A387 Grade 22 Class 2 is a grade of chromium-molybdenum alloy intended primarily for use fabricators in welded boilers and pressure vessels which are designed for use in raised temperature service.
With excellent heat resistance and anti corrosive/oxidation qualities, this steel grade is ideal for use in the chemical, oil and gas industry.

Equivalents

BSENASTM/ASMEDIN
622-515B10CrMo910A/SA387-22-210CrMo910

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

DesignationNominal Chromium Content (%)Nominal Molybdenum Content (%)
A387 Grade 222.25%1.00%

Tensile Requirements for Class 2 Plates

DesignationRequirementGrade 22
A387 Grade 22Tensile 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 %
Elongation in 2 in. [50mm], 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