This specification covers flanged U-channel carbon steel posts having a nominal weight ranging from 0.75 lb ⁄ft to 6.0 lb ⁄ft and a nominal width ranging from 1.25 in. to 4.0 in. These posts are furnished in the as-wrought condition intended for applications requiring high tensile strength or crashworthiness and with a lower carbon (LC) designation for use where higher ductility or improved weldability are required. These materials are available in multiple yield strength levels of 50 ksi, 60 ksi, 70 ksi, and 80 ksi (345 MPa, 420 MPa, 485 MPa, and 550 MPa). The 50 ksi and 60 ksi (345 MPa and 420 MPa) yield strength grades are available as lower carbon posts, designated as Grades 50LC or 60LC.

NOTE 1 This specification does not cover high-strength low-alloy (HSLA) post. Refer to Specification A572/A572M for HSLA. For structural Grade 36, refer to Specification A36/A36M.