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我厂生产的泰山12型拖拉机齿轮(见简图),是用20CrMnTi钢制造的。当锻后经930℃×3 h正火的预备热处理时,发现渗碳淬火后花键孔变形合格率仅为20％。后来,我们利用锻后余热860～900℃水冷
The Taishan 12 tractor gear (see picture) produced by our factory is made of 20CrMnTi steel. When forged by 930 ℃ × 3h normalizing pre-heat treatment, it was found that the pass rate of spline hole after carburizing and quenching was only 20%. Later, we use forged waste heat 860 ~ 900 ℃ water-cooled