1.1 本规范涵盖退火条件（回火）下的轧制沉淀硬化镍铁铬铌钛铝合金（N09908）、镍铬钼铜钛铌合金（N09925）、镍铬钼铌钛合金（N07725）和镍铬钴钛铌合金（N07740）板材、薄板和带材。N09908合金用作超导电缆的护套，用作制造此类电缆的工具，以及需要低膨胀系数材料的其他应用。合金N09925和N07725用于石油和天然气应用中的酸性工况。N07740合金用于建造高温锅炉、压力容器和热交换器。 1.2 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。 1.3 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。 1.4 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 rolled precipitation hardenable nickel-iron-chromium-niobium-titanium-aluminum alloy (N09908), nickel-chromium-molybdenum-copper-titanium-niobium alloy (N09925), nickel-chromium-molybdenum-niobium-titanium alloy (N07725) and nickel-chromium-cobalt-titanium-niobium alloy (N07740) plate, sheet, and strip in the annealed condition (temper). Alloy N09908 is used as sheathing for super conductor cables, as tooling for fabrication of such cables, and for other applications requiring a material with low coefficient-of-expansion properties. Alloys N09925 and N07725 are used in sour service conditions in oil and gas applications. Alloy N07740 is used in the construction of high temperature boilers, pressure vessels, and heat exchangers. 1.2 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. 1.3 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. 1.4 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.