Standard Specication for Structural Steel for Ships1
5.2 Except for Grades A and B steel, semi-killed steels shall not be applied. 5.3 Except as permitted in 5.3.1, Grades D, CS, E, AH32, AH36, AH40, DH32, DH36, DH40, EH32, EH36, EH40, FH32, FH36, and FH40 shall be made using a ne grain practice. For ordinary strength grades, aluminum shall be used to obtain grain renement.
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