Heat treatment technology of M2 steel rolling wheel
Made of M2 steel grinding wheel rolling with 1200 ~ 1210 DEG C quenching and 600 DEG C neutral salt classification into 260 to 280 DEG C nitrate isothermal 2.5h, the tempering process for 580 DEG C * 1h+590 DEG C * 1h+560 DEG C x H nitrate with fire. After tempering hardness 61 ~ 63HRC. According to the user feedback, the best hardness of M14 above large specifications of the rolling wheel is 63HRC, M12 the following small specifications for 62HRC. With the above low temperature quenching high temperature tempering of the rolling wheel did not produce grinding crack, the service life of the original Crl2MoV steel increased 3 ~ 4 times
Can also according to the thread rolling wheel service formulating practical process, such as roller diameter of 120 ~ phi 140mmX40 ~ 70mm (thickness) of Q235 steel rolling wheels, the lower quenching temperature and received good results, the introduction of the process are as follows: 500 DEG C well type furnace preheating, 850 ~ 860 Deg. C * 40S/mm salt bath of pre heat, 1150 to 1160 DEG C * 20S/mm heating, 580 to 620 DEG C grade after 260 ~ 280 DEG C x 2H nitrate isothermal and 580 to 580 DEG C * 1h+550 DEG C x h * 2 times 3 times in total nitrate tempering, after tempering hardness 61 ~ 62 HRC. The life span of the M4 ~ M8 rolling wheel is increased from 20 thousand to 1.5 pieces of the original Crl2MoV steel to 3.8 pieces of steel.