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保加利亚公布了No.39903号专利说明书,批准一项循环热处理工艺获得专利权。 钢件以5～15℃/s的速度预加热到800～900℃,再冷却到300～600℃,反复进行1～3次。最后加热至960～980℃,油淬,随后在300～425℃回火。该工艺可明显提高钢的机械
Bulgarian Patent No. 39903 has been published to grant a patent for a cyclic heat treatment process. The steel is preheated to 800-900 ° C at a speed of 5-15 ° C / s and then cooled to 300-600 ° C and repeated 1 or 3 times. Finally heated to 960 ~ 980 ℃, oil quenching, followed by tempering at 300 ~ 425 ℃. The process can significantly improve the steel machinery