ASTM A387 grade 21 specification covers chromium-molybdenum alloy steel plates intended primarily for welded boilers and pressure vessels designed for elevated temperature service.
ASTM A387 grade 21 material chemical composition
| Element | Carbon | Manganese | Phosphorus,max | Sulfur,max | Silicon | chromium | Molybdenum | |||||||
| Grade 21 | Heat analysis | Product analysis | Heat analysis | Product analysis | Heat analysis | Product analysis | Heat analysis | Product analysis | Heat analysis | Product analysis | Heat analysis | Product analysis | Heat analysis | Product analysis |
| 0.05-0.15 | 0.04-0.15 | 0.30-0.60 | 0.25-0.66 | 0.035 | 0.035 | 0.035 | 0.035 | 0.50max | 0.50max | 2.75-3.25 | 2.63-3.37 | 0.90-1.10 | 0.85-1.15 | |
ASTM A387 grade 21 welded steel pipe/tube mechanical properties
| Tensile strength,ksi[mpa] | Yield strength,min,ksi[mpa] | Elongation in 8 in[200mm],min,% | Elongation in 2 in[50mm],min,% | Reduction of area,min,% | |
| Grade 21 | 75-100 | 45[310] | 18 | 45 |
A387 grade 21 welded pipe/tube dimension
ERW outer diameter:21.3-660mm thickness:6-25mm
LSAW outer diameter:325-1524mm thickness:6-50mm
SSAW outer diameter:219-3200mm thickness:5-25mm
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