本文对淬火+低温回火处理的CDM4012×1588 GCr15型钢滚珠丝杠螺母进行了金相观察和硬度测量。结果表明,同一螺母经热处理后不同部位的组织及硬度呈现出较大差异,这与螺母的原材料质量和淬火工艺有关。因此,应严格控制螺母的原材料质量,并优化该螺母的热处理工艺,以保证其合理的组织与良好的性能。 In this paper, quenching + low temperature tempering treatment of CDM4012 × 1588 GCr15 steel ball screw nut was observed metallurgical and hardness measurements. The results show that the same nut after heat treatment in different parts of the organization and hardness showed a big difference, which is related to the quality of the nut and the quenching process of raw materials. Therefore, the raw material quality of the nut should be strictly controlled and the heat treatment process of the nut should be optimized to ensure its reasonable organization and good performance.