A633 Grade D material is a high strength low alloy steel grade for welded, riveted or bolted construction. It is mainly produced in normalized condition. This low alloy steel is particular suitable for service at low ambient temperatures of -45℃ and higher where notch toughness better than that expected in as-rolled material of a comparable strength level is desired.
There are four grades under specification ASTM A633, designated Grades A, C, D, and E. Grade A633 A provides a minimum yield point of 42 ksi [290 MPa] in thicknesses through 4 in. [100 mm], inclusive. Grades C and D provide a minimum yield point of 50 ksi [345 MPa] in thicknesses up to 2.50 in. [65 mm], inclusive and 46.0 ksi [315 MPa] in thicknesses over 2.50 in. to 4.0 in. [65 to 100 mm], inclusive. Grade E provides a minimum yield point of 60 ksi [415 MPa] in thicknesses up to 4.0 in. [100 mm], inclusive and 55 ksi [380 MPa] in thicknesses over 4 in. to 6 in. [100 to 150 mm], inclusive.
A633 Grade D chemical composition (%)
| Grade |
C max. |
Mn |
P max. |
S max. |
Si |
Cu max. |
Nb max. |
Cr max. |
Nb max. |
| A633 Gr.D |
0.20 |
0.70-1.35 |
0.030 |
0.030 |
0.15-0.50 |
0.35 |
0.25 |
0.25 |
0.08 |
A633 Grade D low alloy steel can be used to manufacture workshops, general construction and various engineering machinery, such as drilling rigs, electric shovels, electric wheel dump trucks, mining trucks, excavators, loaders, bulldozers, etc. It is also used for making cranes, coal mine hydraulic supports and other mechanical equipment and other structural parts.
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