Quenched and Tempered steel bar is more and more widely used in industrial fields because Q&T steel bar has higher tensile strength, yield strength, hardness and better inner quality. For which the steel bar is wear-resistant. It can improve the end product safety and can be used for longer time. Except low carbon steel, most steel materials can be quenched and tempered. Q&T steel bar also save the cost of processing. ISO Grade 8.8 10.9 12.9, ASTM A193 Grade B7 B16, F1554 Grade 55, Grade 105, aisi sae astm 4140, 5140, 42CrMo4, 42CrMoS4, SCM440, S45C, C45, 1045 Q&T steel round bar are popular in market.