1.1 本规范 2. 封面7 %, 8. %, 和9 % 用于制造焊接压力容器的水淬火和回火条件的镍合金钢板。 1.2 本规范下的材料有三种类型，其化学成分如下: 类型 标称镍含量， % 我 9 二、 8. 三、 7. 1.3 根据本规范生产的板材应在−320 °F时[−195 °C]（I型或III型），以及−275 °F时[−170 °C]（II型）；或在商定的其他温度下。 1.4 板材的最大厚度仅受材料满足规定机械性能要求的能力限制。 1.5 这种材料易磁化。如果残余磁性会对后续制造或服务造成损害，则应避免在热处理后的搬运过程中使用磁铁。 1.6 以英寸磅单位或国际单位制表示的数值应单独视为标准值。在文本中，SI单位显示在括号中。每个系统中规定的值并非完全相等； 因此，每个系统必须独立使用。组合两个系统的值可能会导致不符合规范。 1.7 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.8 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。

1.1 This specification 2 covers 7 %, 8 %, and 9 % nickel alloy steel plates for use in the water quenched and tempered condition intended for the fabrication of welded pressure vessels. 1.2 Material under this specification is available in three types having different chemical composition as follows: Type Nominal Nickel Content, % I 9 II 8 III 7 1.3 Plates produced under this specification are subject to impact testing at −320 °F [−195 °C] for Type I or Type III, and −275 °F [−170 °C] for Type II; or at such other temperatures as are agreed upon. 1.4 The maximum thickness of plates is limited only by the capacity of the material to meet the specified mechanical property requirements. 1.5 This material is susceptible to magnetization. Use of magnets in handling after heat treatment should be avoided if residual magnetism would be detrimental to subsequent fabrication or service. 1.6 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. 1.7 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 establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 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.