Microstructure, Properties and Quality of Great Diameter Quenched and Tempered 42CrMoS4 Bar Rolled from Continuous Casting Round Billet

A 42CrMoS4 round billet of 600 mm was rolled to round bar with 250 mm by continuous casting round billet rolling instead of forging, and then quenched and tempered. Microstructure and properties of the round bar after quenching and tempering were analyzed. The results show that the hot-rolled round bar had compact microstructure and good mechanical properties after it was quenched and tempered, and met the requirements of the customers.