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英国的斯托克斯布里奇工程钢公司（SES）是一家主要生产用于高度专业化工程的高级钢厂家。在这些高级钢中，用于关键轴承和宇航工业的钢必须具有最佳的清洁度等级。轴承钢清洁度的评定，传统上采取下列两种方法中的一种：（1）评定10～100um夹杂的微观技术；（2）长度74mm的宏
Stokesbridge Engineering Steel (SES) in the United Kingdom is a leading high-steel producer specializing in highly specialized engineering. In these high-grade steels, steels used in key bearings and the aerospace industry must have the best cleanliness rating. Bearing steel cleanliness assessment, traditionally taken one of the following two methods: (1) assessment of 10 ~ 100um inclusion of microscopic techniques; (2) the length of 74mm macro