Effect of Al and N contents on hardenability of 22CrMoH gear steel

doi:10.13251/j.issn.0254-6051.2025.05.017

Abstract

Abstract: Effect of Al and N contents on hardenability of 22CrMoH gear steel was studied by Jominy test. The results show that different Al and N contents have no obvious effect on the inherent grain size and the actual grain size of the 22CrMoH gear steel during end quenching, but the free Al content has obvious effect on hardenability of the 22CrMoH gear steel. When the content of free Al is less than or equal to 0.018%, the effect of free Al content on hardenability of the tested steel is small; when the content of free Al increases from 0.018% to 0.020%, hardenability of the tested steel increases sharply, and the hardness values from J5 to J25 points are increased by more than 5 HRC; with the further increase of free Al content, hardenability of the tested steel increases slightly. Therefore, in order to obtain the 22CrMoH gear steel with narrow hardenability bandwidth, the free Al content should be ≤0.018% or ≥0.020% by adjusting the Al and N contents.

Key words: 22CrMoH gear steel, hardenability, alloy element, free aluminum

CLC Number:

TG161

Hu Fangzhong, Wang Kaizhong, Wang Yaqian, Yin Defu, Cheng Shijie, Jin Guozhong, Yang Zhiqiang. Effect of Al and N contents on hardenability of 22CrMoH gear steel[J]. Heat Treatment of Metals, 2025, 50(5): 107-110.

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