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.

A387 Gr22 CL2 boiler steel plate is under steel standard specification ASTM A 387/A 387M for pressure vessel steel plates with alloy Cr. And Mo.Pressure vessel steel plate A387 Grade 22 CL2 is mainly intend for welded boilers and pressure vessels designed for elevated temperature services. When rolling boiler plate A387 Gr22 cl2 other steel standard shall be followed, A20/A20M, A370 test methods and definitions for mechanical testing of steel products, A435/A435M, A577/A577M and A588/A588M.

Technical Requirements & Additional Services:

  • High tension test
  • Low temperature impacting test
  • Normalised for thick plates over 40mm
  • Simulated post-welded heat treatment (PWHT)
  • Rolling under standard NACE MR-0175 (HIC+SSCC)
  • Issued Orginal Mill test certificate under EN 10204 FORMAT 3.1/3.2
  • Shot blasting and Painting, Cutting and welding as per end user’s demands

Mechnical property for A387Gr22Cl2 boiler steel:

Yield strength (≥Mpa) Tensile strength (Mpa) Elongation in ≥,%
310 515-690 200mm 50mm

Chemical composition for A387 Grade 22 Cl2 boiler steel (Product Analysis Max%)

Main chemical elements composition of A387Gr22Cl2
C Si Mn P S Mo Cr
0.04-0.15 0.50 0.25-0.66 0.035 0.035 0.85-1.15 1.88-2.62


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. [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 for ASTM A387 Grade 22 Alloy Steel Plates

Element Chemical Composition (%)
A387 Grade 22
Carbon: Heat Analysis: 0.05 – 0.15
Product Analysis: 0.04 – 0.15
Manganese: Heat Analysis: 0.30 – 0.60
Product Analysis: 0.25 – 0.66
Phosphorus: Heat Analysis: 0.035
Product Analysis: 0.035
Sulphur (max): Heat Analysis: 0.035
Product Analysis: 0.035
Silicon: Heat Analysis: 0.50 max
Product Analysis: 0.50 max
Chromium: Heat Analysis: 2.00 – 2.50
Product Analysis: 1.88 – 2.62
Molybdenum: Heat Analysis: 0.90 – 1.10
Product Analysis: 0.85 – 1.15
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