ASTM A302 Grade D steel covers manganese-molybdenum and manganese- molybdenum- nickel alloy steel plates intended particularly for welded boiler and other pressure vessels.
ASTM A302 Grade D material chemical composition
| Grade | C,max | Mn | P max | S max | Si | Mo | ||
| ≤1in(25mm),incl | >1≤2in.(50mm),incl | >2in.(50mm) | ||||||
| Grade D | 0.20 | 0.23 | 0.25 | 1.07-1.62 | 0.035 | 0.035 | 0.13-0.45 | 0.41-0.64 |
ASTM A302 Grade D steel mechanical properties
| Grade | Tensile strength,ksi,mpa | Yield strength,min,ksi,mpa | Elongation in 8in.[200mm],min,% | Elongation in 2in.[50mm],min,% |
| Grade D | 80-100[550-690] | 50[345] | 17 | 20 |
ASTM A302 Grade D steel heat treatment:
ASTM A302 Grade D steel plate 2in.[50mm] and under in thickness are normally supplied in the as-rolled condition.plates may be ordered normalized or stress relieved,or both.
ASTM A302 Grade D steel plates over 2in.[50mm] in thickness shall be normalized.
When normalizing ASTM A302 Grade D steel plates 4in.[100mm] or over in thickness,the cooling rate may be accelerated by air blasting or liquid quenching to obtain mechanical properties comparable to those developed by normalizing plates in the lesser thicknesses.
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