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在工厂中通常采用等温退火法使高速钢软化。即是将欲软化的高速钢加热至830～850℃,保温2～3小时,而后以30～40℃/小时冷速冷至720～750℃,保温4～6小时完成珠光体转变。等温退火虽较正常退火(即完全退火)缩短了不少时间,但需时仍然很长。因之亦不适用于单件生产和生产急需之要求。在生产中我们试验和推行了以下高速钢迅速软化法:将欲软化之高速钢三次加热至800℃,并保温使之
High-speed steels are usually softened by isothermal annealing in the factory. That is to be softened high-speed steel heated to 830 ~ 850 ℃, incubated for 2 to 3 hours, then cooled to 720 ~ 750 ℃ 30 ~ 40 ℃ / hour cooling rate, holding 4 to 6 hours to complete the pearlite transformation. Although the isothermal annealing than normal annealing (ie, complete annealing) shortened a lot of time, but takes a long time. It also does not apply to the one-piece production and production of much-needed requirements. In production, we tested and implemented the following high-speed steel rapid softening method: high-speed steel to be softened three times heated to 800 ℃, and so that the heat