ASTM A302 Grade A steel specification for pressure vessel plates,alloy steel,manganese-molybdenum and manganese-molybdenum-nickel.
ASTM A302 Grade A alloy steel plates maximum thickness is limited only by the capacity of the chemical composition to meet the specified mechanical property requirements.the minimum thickness is limited to 0.25 in.[6.5mm].
ASTM A302 Grade A material chemical composition
| Grade | C,max | Mn | P max | S max | Si | Mo | ||
| ≤1in(25mm),incl | >1≤2in.(50mm),incl | >2in.(50mm) | ||||||
| Grade A | 0.20 | 0.23 | 0.25 | 0.87-1.41 | 0.035 | 0.035 | 0.13-0.45 | 0.41-0.64 |
ASTM A302 Grade A pressure vessel steels mechanical properties
| Grade | Tensile strength,ksi,mpa | Yield strength,min,ksi,mpa | Elongation in 8in.[200mm],min,% | Elongation in 2in.[50mm],min,% |
| Grade A | 75-95[515-655] | 45[310] | 15 | 19 |
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