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YS/T 18-1991 铜阳极板圆盘铸锭机技术条件 被代替 发布日期 :  1991-10-16 实施日期 :  1992-10-01

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ISO 5080:1994 EN 18dadf02 Sisal agricultural twines 现行 发布日期 :  1994-10-20 实施日期 : 

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This specification covers the standard specification for medium carbon bearing quality steel to be used in the manufacture of anti-friction bearings. The bearings shall conform to the required chemical composition for carbon, phosphorus, manganese, sulfur, silicon, chromium, molybdenum, vanadium, copper, oxygen and aluminum. Requirement for dimensional tolerances of hot-rolled or hot-rolled and annealed bars, in straight lengths or coils, and cold-finished bars and larger in diameter furnished shall conform to the specified size, shape and tolerances. The grain size of the material shall conform to the required size, otherwise it shall be normalized and retested. Decarburization and surface imperfection shall not exceed the limit in the specified values. Material may be ordered as hot rolled or thermally treated. No hardness limits shall apply for as-hot-rolled materials.1.1 This specification covers medium carbon bearing quality steel to be used in the manufacture of anti-friction bearings.1.2 Supplementary requirements of an optional nature are provided and when desired shall be so stated in the order.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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