ABS Steels are types of structural steel which are standardized by the American Bureau of Shipping for use in shipbuilding. ABS steels come many grades in ordinary-strength and two levels of higher-strength specifications.All of these steels have been engineered to be optimal long-lived shipbuilding steels. ABS does permit the use of other steels in shipbuilding, but discourages it, and requires more detailed engineering analysis. ABS Ship Class(American Bureau of Shipping),ABS certification is issued by the American Bureau of Shipping (ABS) issued a certificate.ABS Ship Class main steel grade:ABS grade A,B,D,E,AH32,AH36,DH36 and so on.