1.1 本规范涵盖退火状态下的镍铁铬钼铜氮低碳合金、镍铁铬硅合金、铬镍铁氮低碳合金、铁镍铬钼铜氮合金和镍铁铬钼氮合金板材、薄板和带材。 1.2 ASTM国际采用了一些定义，其中一些等级（如UNS N08904）在本规范之前被视为不锈钢，因为这些等级的铁是质量百分比最大的元素。此类等级由ASTM委员会A01及其小组委员会监督。本规范先前涵盖的N08904产品现已涵盖在本规范中 A240/A240M 和 A480/A480M . 1.3 以英寸-磅为单位的数值应视为标准值。 括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任熟悉所有危险，包括制造商提供的本产品/材料的适当安全数据表（SDS）中确定的危险，建立适当的安全、健康和环境实践，并在使用前确定监管限制的适用性。 1.5 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 nickel-iron-chromium-molybdenum-copper-nitrogen low-carbon alloy, nickel-iron-chromium-silicon alloy, chromium-nickel-iron-nitrogen low-carbon alloy, iron-nickel-chromium-molybdenum-copper-nitrogen alloy, and nickel-iron-chromium-molybdenum-nitrogen alloy plate, sheet, and strip in the annealed temper. 1.2 ASTM International has adopted definitions whereby some grades, such as UNS N08904, previously in this specification were recognized as stainless steels, because those grades have iron as the largest element by mass percent. Such grades are under the oversight of ASTM Committee A01 and its subcommittees. The products of N08904 previously covered in this specification are now covered by Specifications A240/A240M and A480/A480M . 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 standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use. 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.