1.1 本规范涵盖各种成分和尺寸的热加工合金钢、碳钢和碳硼钢，这些钢在端淬试验中可能达到规定的硬化深度。这些钢成分通过添加到传统牌号上的后缀字母“H”来识别。 1.2 本规范规定了以下内容以外的分析: 表1和 2. . 经买方和制造商批准后，也允许特殊淬透性极限。 1.3 以英寸-磅为单位的数值应视为标准值。本标准不包括其他计量单位。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。

1.1 This specification covers hot-worked alloy, carbon, and carbon-boron steels in a variety of compositions and sizes, which may attain specified depth of hardening in the end quench test. These steel compositions are identified by the suffix letter “H” added to the conventional grade number. 1.2 This specification provides for analyses other than those listed under Tables 1 and 2 . Special hardenability limits are also permissible when approved by the purchaser and manufacturer. 1.3 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this 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.