220.127.116.11 Requirements for Steel
(a) Rolled and Formed Steel. ASTM A36 or ASTM A283 Grade D or CAN/CSA-G40.21.
(b) Forged Steel. ASTM A668 Class B.
(c) Cast Steel. ASTM A27 Grade 60/30.
(a) ASTM A502
(b) ASTM A307
Rivets, bolts, and rods made of steel having greater strength than specified by ASTM A307 and ASTM A502 shall be permitted to be used, and the maximum allowable stresses increased proportionally, based on the ratio of the ultimate strengths. Elongation shall conform to the requirements of the corresponding ASTM specifications.