ASTM A387 Grade22 Class2 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:
BS
EN
ASTM/ASME
DIN
622-515B
10 CRMO910
A387-22-2
10 CRMO910
Specifications:
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:
Grade22
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:
Element
Chemical Composition (%) inc. Grade & UNS No.
Grade 22 (UNS: K21590)
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
Tension Test Requirements:
Material shall be tested using a test specimen will confirm to the tensile requirements as outlined in Table 2.
Other requirements:
The following requirements and testing procedures (which are not mandatory) are considered suitable for Chrome 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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