1.1 本规范 2. 盖双重正火和回火9 % 专门用于低温设备焊接压力容器的镍钢板。 1.2 根据本规范生产的板材应在−320 华氏度[−195 °C]或商定的其他温度。 1.3 板材的最大厚度仅受材料满足特定机械性能要求的能力限制。 1.4 这种材料易磁化。如果残余磁性会对后续制造或服务造成不利影响，则应避免在热处理后处理过程中使用磁铁。 1.5 以英寸-磅单位或国际单位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。每个系统中所述的值并不完全相等； 因此，每个系统必须独立于其他系统使用。组合两个系统的值可能会导致不符合规范。 1.6 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 2 covers double-normalized and tempered 9 % nickel steel plates intended particularly for welded pressure vessels for cryogenic service. 1.2 Plates produced under this specification are subject to impact testing at −320 °F [−195 °C] or at such other temperatures as are agreed upon. 1.3 The maximum thickness of plates is limited only by the capacity of the material to meet the specific mechanical property requirements. 1.4 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. 1.5 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. 1.6 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.