ASME SA633 Grade D material is particularly suited for service at low ambient temperatures of -50℉ 【-45℃】and higher where notch toughness better than that expected in as-rolled material of a comparable strength level is desired.
ASME SA633 Grade D Chemical Composition
|
Grade |
Chemical composition % |
|
SA633 GR.D |
C |
Si |
Mn |
P |
S |
Cu |
Ni |
Cr |
Mo |
|
≤0.20 |
0.15-0.50 |
0.70-1.60 |
≤0.035 |
≤0.04 |
≤0.35 |
≤0.25 |
≤0.25 |
≤0.08 |
ASME SA633 Grade D Mechanical Property
|
Grade |
Yield Strength
Mpa |
Tensile Strength
Mpa |
Elongation in 2 in.
% |
Elongation in 8 in.
% |
|
SA633 Gr.D |
≥315 |
450-620 |
≥23 |
≥18 |
The SA633 Grade D shall be normalized by heating to a suitable temperature which produces an austenitic structure, but not exceeding 1700℉ 【925℃】, holding a sufficient time to attain uniform heat throughout the SA633 Grade D material and cooling in air.
If the purchaser elects to perform the SA633 Grade D required heat treatment, the SA633 Grade D material shall be accepted on the basis of mill tests made from test coupons heat treated in accordance with the purchase order requirements. If the test coupon heat treatment requirements are not indicated on the SA633 Grade D purchase order, the manufacturer shall heat threat the test coupons under conditions considered appropriate. The SA633 Grade D manufacturer shall inform the purchaser of the heat-treatment procedure followed in heat treating the test coupons at the mill.
