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1.1 ,This specification2 covers high-strength quenched and tempered low-alloy steel forged parts for pressure vessels. The maximum thickness of forgings under this specification shall be 11/2 ,in. [38 mm] for Grade A, and 4 in. [100 mm] for Grades E and F.
Note 1: ,These grades are similar to corresponding grades in Specification A517/A517M.