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1972年,经过系统的试验,确定出一个适合190、195球铁曲轴的热处理新工艺,即在750～760℃保温60分钟以后,再随炉升温到920℃不保温就出炉正火。这就是球墨铸铁两阶段加热快速正火新工艺。经过六、七年来在金华农机厂实际生产应用的证明,这一热处理新工艺具有操作简单、容易掌握、综合机械性能提高、节约能源、缩短热处理周期、提高生产率等优点。
In 1972, through systematic tests, a heat treatment process suitable for 190,195 ductile iron crankshafts was determined. After heat-holding at 750 to 760 ° C for 60 minutes, the temperature was raised to 920 ° C with the furnace and the normalizing was done. This is the ductile iron two-stage heating fast normalizing new process. After six or seven years of actual production and application in Jinhua Agricultural Machinery Factory proved that this new heat treatment process has the advantages of simple operation, easy to master, improve mechanical properties, save energy, shorten the heat treatment cycle, improve productivity and so on.