Optimization of Controlled Rolling and Cooling Process on Low-Alloy High-Strength Quenched and Tempered Steel

The influence of low-alloy high-strength quenched and tempered steel rolling method and the cooling rate on microstructure and mechanical properties after quenching and tempering was studied.The results show that,under the experimental conditions,experimental steels using different rolling methods and different cooling rate to obtain the initial microstructure and mechanical properties,but they have the same microstructure and mechanical properties after quenching and tempering.Low-alloy high-strength quenched and tempered steel recommends using one stage rolling method,finish rolling temperature should be higher than the ceiling temperature of the austenite recrystallization region,after rolling the adoption of appropriate cooling rate(4-15 ℃/s) in an accelerated cooling.In this process the experimental steel quenched and tempered has a higher uniformity,as compared with the current TMCP technology,more excellent strength and plasticity,strength and toughness.