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QPQ盐浴复合处理是一种新型的材料表面硬化工艺。经QPQ处理的套圈和钢球，其表面硬度提高，摩擦系数降低，轴承的摩擦力矩性能得到改善。由于轴承表面耐磨性的提高，对轴承寿命的提高大有益处。附图2幅．表3个。
QPQ salt bath composite treatment is a new type of material surface hardening process. The QPQ-treated ferrules and steel balls have improved surface hardness, lower friction coefficient, and improved friction moment performance of the bearing. Due to the increased wear resistance of the bearing surface, the improvement of bearing life is of great benefit. Figure 2 Photo. Table 3.