ASTM A387 Grade 22 Class 2 is a chromium-molybdenum alloy steel plate used for weldable boilers and pressure vessels in high-temperature service, featuring higher strength than Class 1, with 2.00-2.50% Chromium and 0.90-1.10% Molybdenum, supplied normalized and tempered for applications in the oil, gas, and power industries.
Equivalents for ASTM A387 Grade 22 Alloy Steel Plates
| BS | EN | ASTM/ASME | DIN |
| 622-515B | 10 CRMO910 | A387-22-2 | 10 CRMO910 |
Specifications for ASTM A387 Grade 22 Alloy Steel Plates
Chromium & Molybdenum content (according to the ASME specification)
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| A387 Grade 22 | 2.25% | 1.00% |
Tensile Requirements for ASTM A387 Grade 22 Alloy Steel Plates 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 |
Application Industries Of Alloy Steel ASTM A387 Grade 22 Class 2 Plate
Power Generation
Petrochemicals
Gas Processing
Specialty Chemicals
Pharmaceuticals
Chemical Equipment
Sea Water Equipment
Heat Exchangers
Condensers
Pulp and Paper Industry
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1.What is A387 grade 22 material?
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.
2.Is A387 grade 22 class 2 better than A387 grade 22 class 1?
Yes, ASTM A387 Grade 22 Class 2 is "better" than Class 1 in terms of strength, as it offers higher minimum yield and tensile strength, making it more resistant to stress, but Class 1 might be preferred for better formability and weldability due to lower strength requirements, as both share the same chemical composition but differ in mechanical properties.