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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 - 0.150.04 - 0.15 |
| Manganese (Mn) | % |
| Heat Analysis:Product Analysis: | 0.30 - 0.600.25 - 0.66 |
| Phosphorus (P) | % |
| Heat Analysis:Product Analysis: | 0.0350.035 |
| Sulphur (S) (Max) | % |
| Heat Analysis:Product Analysis: | 0.0350.035 |
| Silicon (Si) | % |
| Heat Analysis:Product Analysis: | 0.50 max0.50 max |
| Chromium (Cr) | % |
| Heat Analysis:Product Analysis: | 2.00 - 2.501.88 - 2.62 |
| Molybdenum (Mo) | % |
| Heat Analysis:Product Analysis: | 0.90 - 1.100.85 - 1.15 |
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