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我国每年都要从国外进口热轧18CrMn-Ti圆钢(相当于我国的20CrMnTi钢),主要应用于制作齿轮、凸轮和活塞销等零件,生产上大多采用渗碳、淬火和低温回火工艺以满足使用要求。一般在920～940℃渗碳后预冷到840～850℃进行直接淬火。目前对进口18CrMnTi钢的检验是依据苏联标准ΓОСТ4543-1961进行的,标准规定这种钢的热处理制度为:第一次880℃加热淬火,油冷;第二次870℃淬火油冷,200℃回火。我国国标GB3077-1982关于20CrMnTi钢的热处理规范与上述制度相
Every year, China imports hot rolled 18CrMn-Ti round steel (equivalent to China’s 20CrMnTi steel) every year. It is mainly used in the production of gears, cams and piston pins. Most of the production is carburizing, quenching and tempering Meet the requirements. Generally 920 ~ 940 ℃ after carburizing pre-cooling to 840 ~ 850 ℃ for direct quenching. The current inspection of imported 18CrMnTi steel is based on the Soviet Union ΓОСТ4543-1961 standards, the standard provisions of this steel heat treatment system: the first 880 ℃ heating quenching, oil cooling; the second 870 ℃ quenching oil cooling, 200 ℃ back fire. China’s national standard GB3077-1982 20CrMnTi steel heat treatment specifications and the above phase