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在机械和轻工产品中的一些小零件,如螺钉、螺帽、垫圈、销轴、链条、钢球等,其质量好坏直接影响整机的质量,影响产品的可靠性。这些小零件很多是易损件,要求具有良好的质量,如金相组织、硬度和强度等。生产这一类产品的工厂不大,由于多数属于专业厂,产品单一,批量较大。特别是一些轻纺工业的工厂,热处理设备陈旧和老化,工艺落后,目前大多数仍采用固体渗碳或加氰盐的盐浴渗碳工艺。它对环境污染严
In the mechanical and light products, some small parts, such as screws, nuts, washers, pins, chains, steel balls, the quality of a direct impact on the quality of the whole machine, affecting product reliability. Many of these small parts are wearing parts that require good quality, such as microstructure, hardness and strength. The factory that produces this kind of product is not big, because the majority belongs to the professional factory, the product is single, the batch is bigger. In particular, some factories in the textile industry, obsolescence and aging heat treatment equipment, technology behind, most still use solid carburizing or cyanide salt bath carburizing process. It is very polluting to the environment