Heat Treatment Process of High Chromium Steel Roll and Its Microstructure and Hardness

By means of SEM,EDS,XRD and hardness tester,the effect of austenitizing temperature and holding time on the microstructure and hardness of high chromium steel roll was analyzed,and the heat treatment parameters of the roll were determined.The results show that with the increase of austenitizing temperature and the holding time,the hardness increased first and then decreased and with the increase of temperature and the shortening of holding time,the martensite content decreased.The roll had uniform microstructure and good hardening effect with the hardness of 740-760 HV as the roll was austenized at 1 030 ℃ for 1.5 h and air cooled,and then tempered at 520 ℃ for 10-30 min.