1.1 This specification covers requirements for forged steel shapes for highly stressed structural members requiring yield strengths in excess of 140 ksi [965 MPa]. 1.2 This specification is not intended for applications This specification deals with the standard requirements for superstrength alloy steel forgings for highly stressed structural members. Covered here are eight types (twenty-seven grades) of alloy steels, namely: quenched and tempered steels (Grades 11,