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通过对含Ｍｏ的２０ＣｒＭｎＴｉ钢制齿轮坯料正火组织、性能的研究分析，证明此钢正火后形成粒状贝氏体导致其硬度较高（一般为２６０～２８０ＨＢ），从而给坯料加工带来困难。为此，本文提出了等温正火处理新工艺，其硬度与２０ＣｒＭｎＴｉ钢正火后的硬度相同，以适应机械加工需要
The microstructure and properties of 20CrMnTi steel gear blank containing Mo were studied and analyzed. It was proved that the formation of granular bainite after normalizing the steel resulted in higher hardness (usually 260 ~ 280HB), which made the processing of the blank difficult . To this end, this paper presents a new isothermal normalizing process, its hardness and 20CrMnTi steel after normalizing the same hardness to meet the machining needs