1.1 本规范 2. 涵盖了具有强制性韧性要求的热处理碳钢和合金钢锻件。这些锻件用于压力容器、给水加热器和类似用途。 1.2 这些锻件包括管板、盖子、槽筒、整体锻造槽、环、喷嘴、法兰和类似零件。 1.3 所有等级在适当条件下都被认为是可焊接的。 1.4 根据本规范生产的锻件的最大厚度仅受所选等级对任何指定热处理的响应能力和满足指定机械试验（包括在指定温度下的冲击试验）的限制。 1.5 根据本规范提供的材料应符合规范的要求 A788/A788M ，概述了其他订购信息、制造要求、测试和重新测试方法和程序、标记、认证、产品分析变化和其他补充要求。 1.6 如果本规范的要求与规范的要求相冲突 A788/A788M ，应以本规范的要求为准。 1.7 以英寸-磅单位或SI[公制]单位表示的值应单独视为标准值；在文本和表格中，国际单位制显示在括号中。 每个系统中所述的值不一定是完全等效的；因此，为确保符合标准，每个系统应独立使用，两个系统的值不得组合。 1.8 除非订单规定了适用的“M”规格名称，否则材料应按英寸-磅单位提供。 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 2 covers heat-treated carbon steel and alloy steel forgings with mandatory toughness requirements. These forgings are intended for pressure vessels, feedwater heaters, and similar uses. 1.2 These forgings include tube sheets, covers, channel barrels, integral forged channels, rings, nozzles, flanges, and similar parts. 1.3 All grades are considered weldable under proper conditions. 1.4 The maximum thickness of forgings produced to this specification is limited only by the capacity of the selected grade to respond to any heat treatment specified and to meet the specified mechanical tests, including impact tests at the specified temperature. 1.5 Material supplied to this specification shall conform to the requirements of Specification A788/A788M , which outlines additional ordering information, manufacturing requirements, testing and retesting methods and procedures, marking, certification, product analysis variations, and additional supplementary requirements. 1.6 If the requirements of this specification are in conflict with the requirements of Specification A788/A788M , the requirements of this specification shall prevail. 1.7 The values stated in either inch-pound units or SI [metric] 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 designation, the material 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.