1.1 本规范涵盖主要用于制造工具的退火、热轧棒材、锻件、板材、薄板或带材以及退火、冷加工棒材或锻件等钨型和钼型高速钢。 1.2 涵盖了T1、T2等七种钨高速工具钢，M1、M2等十七种钼高速工具钢以及M50和M52两种中高速钢。选择将取决于设计、使用条件和机械性能。 1.3 附件中描述了术语“高速钢”及其最低要求。 1.4 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers tungsten-type and molybdenum-type high-speed steels available as annealed, hot-rolled bars, forgings, plate, sheet, or strip, and annealed, cold-finished bars or forgings used primarily in the fabrication of tools. 1.2 Seven types of tungsten high-speed tool steels designated T1, T2, etc., seventeen types of molybdenum high-speed tool steels designated M1, M2, etc., and two intermediate high-speed steels designated as M50 and M52 are covered. Selection will depend upon design, service conditions, and mechanical properties. 1.3 The term “high-speed steel” is described and its minimum requirements are covered in the Annex. 1.4 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. 1.5 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.