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我厂客车上的销子大多用Q235—A钢制造,为提高表面硬度和耐磨性,采用了气体渗碳后直接淬火的热处理工艺。淬火冷却介质原采用冷却速度较快的10～15％的氯化钠水溶液,淬火基本上能达到销子技术条件上的硬度要求,但采用盐水液体作为淬火介质有两个缺点:一是销于淬火冷却后表面的残盐很难清洗干净,放置过程中易生锈;二是盛盐水的淬火槽以及淬火时必须浸在淬火冷却溶液中的大料框,锈蚀严重,
Most of the pins of our factory buses are made of Q235-A steel. In order to improve the surface hardness and abrasion resistance, the heat treatment process of direct quenching of gas carburizing is adopted. Quenching cooling medium using the original cooling rate of 10 to 15% of the sodium chloride solution, quenching can basically meet the pin on the hardness requirements, but the use of brine as a quenching medium has two drawbacks: First, sales After quenching and cooling the surface of the residual salt is difficult to clean, easy to rust during placement; Second, salt brine quenching tank and quenching must be immersed in the quenching cooling solution in the large material box, serious corrosion,