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BJ130汽车二轴三、四挡套(见零件图)的材料是20CrMnTi。热处理技术要求为:渗碳深度0.8～1.2mm;淬火后硬度HRC58～64。由于内键槽φ46_(+0)~(+0.17)在渗碳、淬火后不再进行加工,根据使用拉刀的修磨
BJ130 car two-axis three or four stop sleeve (see the parts map) of the material is 20CrMnTi. Technical requirements for heat treatment: carburizing depth of 0.8 ~ 1.2mm; hardness after quenching HRC58 ~ 64. As the keyway φ46 _ (+0) ~ (+0.17) in the carburizing, quenching no longer processed, according to the use of broaching grinding