This specification covers two grades (C and D) of carbon steel plates of structural quality for general application.When the steel is to be welded, a welding procedure suitable for the grade of steel and intended use or service is to be utilized. See Appendix X3 of Specification A6/A6M for information on weldability.The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exactly equivalents; therefore, each system is to be used independently of the other, without combining values in any way.
| Grades | Descriptions |
|---|---|
| Grade C | - |
| Grade D | - |
| Grade | Carbon,max | Manganese,max | Phosphorus,max | Sulfur,max | Silicon | Copper, min % when copper is specified | |
|---|---|---|---|---|---|---|---|
| Plates 11/2 in. [40 mm] and under, max | Plates over 11/2 in. [40 mm] | ||||||
| Grade C | 0.24 | 0.90 | 0.030 | 0.030 | 0.40 | 0.15–0.40 | 0.20 |
| Grade D | 0.27 | 0.90 | 0.030 | 0.030 | 0.40 | 0.15–0.40 | 0.20 |
| Grades |
Tensile strength,min: ksi [MPa] |
Yield strength,min: ksi [MPa] |
Elongation in 8 in. [200 mm] min, %A | Elongation in 2 in. [50 mm] min, %A,B |
|---|---|---|---|---|
| Grade C | 55–75 [380–515] | 30 [205] | 22 | 25 |
| Grade D | 60–80 [415–550] | 33 [230] | 20 | 23 |