Effect of FTSR Hot Rolling Process on Microstructure and Mechanical Properties of 65Mn Strip

Microstructure and mechanical properties of FTSR 65Mn steel strips produced by different hot coiling technologies was investigated,and simulated quenching heat-treatment were carried on. The result shows that ferrite reduces in term of its volume fraction and finically disappears with coiling temperature going down from 740 ℃ to 600 ℃,but the pearlite size and space decrease,and strength and hardness of resulted 65Mn strip increase. When the strip is heated at 850 ℃,the coarsing of transformed austenite grain is retarded,and the size of grains is directly affected by primary pearlite. Industrial quenching process based on experiment is suitable for strip production of the required performance,and the hardness of strip surface after quenching is above 53 HRc.