After quenching and low tempering,it was found that the hardness of surface alloying is up to 1300HV.The hardness value is higher than that of metallurgy HSS.是什么意思_After quenching and low tempering,it was found that the hardness of surface alloying is up to 1300HV.The hardness value is higher than that of metallurgy HSS.在线翻译_英语_读音_用法_例句