Microstructure and mechanical property of 22MnB5 high-strength steel

We have metal heat treatment for 22MnB5 steel with seven different experimental schemes and have mechanical property test on the seven steels. Then the microstructure and mechanical property of treated steels are studied, and the results show that 300 degrees C is the optimum preservation temperature, at which we can get the optimum specific elongation of 22MnB5 steel. The tensile strength of steel thermal insulated at 300 degrees C for 3 minutes is better than that of steel tempered at 300 degrees C for 3 minutes, while as for specific elongation, the latter one is better. And we can also get homogeneous lath martensite after die quenching. The experiment lays foundations of the actual production process of hot forming.