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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℃不保温即出炉正火。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的应用证明,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、节约能源消耗;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 furnace was normalized. This is the ductile iron two-stage heating fast normalizing new process. After six or seven years at Jinhua Agricultural Machinery Plant, the actual production proves that this new heat treatment process has the advantages of simple operation, easy to master, comprehensive mechanical performance improvement, energy saving, shortening the heat treatment cycle and increasing productivity.