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高速钢二次硬化
met.
progressive hardening of high-speed steel
(【技】高速钢淬火后硬度升高是第一次硬化。其后分别在 350°C 以下、350° C 以上回火,最终在520 ~ 580°C 温度范围内回火出现第二个硬度高峰,并且超过淬火硬度,即为二次硬化。)
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