Improvement of hot stamping process for high strength steel

The transformation process and mechanical performance of high strength steel 22MnB5 have been researched in the text.The hot stamping process has been optimized based on deep drawing test.The cooling technology in transportation phase has been used in the hot stamping process in order to reduce the temperature of completely austenitized sheet into the optimal stamping temperature before quenching.The test shows that the improved hot stamping technology has improved the forming quality and reduced removed corrugation and fracture.The transformation of martensite has been more fine and sufficient with more than 1500MPa tensile strength and more than 450HV hardness.It can satisfy the improvement requirement of automatic continuous hot stamping production process.