The classification society for ASTM A131 Grade A, B, C and D steel work can be ABS, LR, DNV, BV, GL, CSS etc. The Grade A, B, C and D Steel Work usually is used in the manufacturing of the hull structure of the ship.
This specification covers structural quality carbon steel plates furnished to chemical composition requirements. ASTM A 830 SAE1050 steel is available in several standard steel grades and non-standard grades.