我厂生产的195曲轴(牌号QT60—2)和290曲轴(牌号QTT0—2)一直采用正火热处理工艺。经过去年一年的试验证明,利用铸件余热正火代替正火热处理对于195球铁曲轴是完全可行的。这样做不仅能降低成本,节省人力,缩短生产周期,而且可以大量节约电能。按我厂一九八四年计划生产 I produced 195 crankshaft (grade QT60-2) and 290 crankshaft (grade QTT0-2) has been using normalizing heat treatment process. After a year of tests proved that the use of cast heat afterheat instead of normalizing heat treatment for 195 ductile iron crankshaft is entirely feasible. This will not only reduce costs, save manpower, shorten the production cycle, and can save a lot of energy. According to our factory plan production in 1984