1.1 本规范涵盖9 % 采用直接淬火工艺生产的镍合金钢板。钢板主要用于焊接压力容器。 1.2 直接淬火工艺包括在轧制后直接淬火板材，在淬火操作开始之前不允许板材冷却到临界温度以下，然后回火板材（见 附录X1 ). （注:直接淬火工艺不同于“传统”工艺，在“传统”工艺中，允许板材冷却到明显低于临界温度的温度，通常是环境温度，然后再加热到高于上临界温度的温度，然后淬火，然后回火。） 1.3 如果板材进行热成型，温度不得超过950°F[510°C]。 1.4 根据本规范提供的板材的最大标称厚度不得超过2英寸。 [50毫米]。 1.5 这种材料易磁化。如果残余磁性对后续制造或服务有害，则应避免在热处理后的处理中使用磁铁。 1.6 以英寸-磅或国际单位制表示的数值应单独视为标准值。在文本中，国际单位显示在括号中。每个系统中规定的值不是精确的等价物；因此，每个系统必须相互独立使用。合并两个系统的值可能会导致不符合规范。 1.7 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 9 % nickel-alloy steel plates produced by the direct-quenching process. The plates are intended primarily for use in welded pressure vessels. 1.2 The direct-quenching process consists of quenching the plates directly after rolling, without permitting the plates to cool below the critical temperature prior to initiation of the quenching operation, and subsequently tempering the plates (see Appendix X1 ). (Note: The direct-quenching process differs from the “conventional” process in which the plates are permitted to cool to a temperature significantly below the critical temperature, usually to ambient temperature, prior to reheating to a temperature above the upper critical temperature, then quenching, and subsequently tempering.) 1.3 If the plates are subjected to warm forming, the temperature shall not exceed 950°F [510°C]. 1.4 The maximum nominal thickness of plates furnished under this specification shall not exceed 2 in. [50 mm]. 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 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 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.