1.1 本规范涵盖一般工业用未经处理和热处理的碳钢和合金钢锻件。锻件的其他ASTM规范可用于特定应用，如压力容器、铁路、涡轮发电机、齿轮装置和其他涉及特殊温度要求的应用。 1.2 热轧或冷加工钢筋不在本规范的范围内。 1.3 列出了六类碳钢和七类合金钢锻件（见第节 7. )，表明其所需的热处理以及机械性能。 1.4 仅在硬度测试后提供锻件，后缀H用于认证和标记。 1.5 补充要求，包括规范中的要求 A788/A788米 ，具有可选性质。这些规定仅适用于买方规定的情况。 1.6 附录X1 列出了与各种规格类别相对应的当前类别 第235页 , 第237页 和 第243页 ，已被本规范所取代。 1.7 以国际单位制或英寸磅单位表示的数值应单独视为标准；在文本和表格中，国际单位制单位显示在括号中。每个系统中规定的值不一定是精确的等效值；因此，为了确保符合标准，每个系统应独立使用，并且两个系统的值不应合并。 1.8 除非订单规定了适用的“M”规范，否则锻件应以英寸磅为单位。 1.9 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 untreated and heat-treated carbon and alloy steel forgings for general industrial use. Other ASTM specifications for forgings are available for specific applications such as pressure vessels, railroad use, turbine generators, gearing, and others involving special temperature requirements. 1.2 Hot-rolled or cold finished bars are not within the scope of this specification. 1.3 Six classes of carbon steel and seven classes of alloy steel forgings are listed (see Section 7 ), which indicate their required heat treatments, as well as mechanical properties. 1.4 Provision, with the suffix H for certification and marking, for the supply of forgings after hardness testing only. 1.5 Supplementary requirements, including those in Specification A788/A788M , of an optional nature are provided. These shall apply only when specified by the purchaser. 1.6 Appendix X1 lists the current classes corresponding to the various classes of Specifications A235 , A237 , and A243 , which have been superseded by this specification. 1.7 The values stated in either SI units or inch-pound units are to be regarded separately as standard; within the text and tables, the SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.8 Unless the order specifies the applicable “M” specification, the forgings shall be furnished to the inch-pound units. 1.9 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.