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 |