1.1 This specification covers hot-wrought and cold-finished quenched and tempered alloy steel bars. 1.2 Hot-wrought bars are available in three strength level classes designated BB, BC, and BD, and cold-finished bars in This specification covers hot-wrought and cold-finished quenched and tempered alloy steel bars. The steel materials shall be melt processed by using open-heart, basic oxygen, or electric furnace and shall conform to the austenitic grain size requiremen