1.1 本规范 2. 涵盖五种等级的螺栓连接材料，十二种屈服强度等级范围为50至120 ksi[345至827 MPa]，用于高温条件下的螺栓连接部件，如压力容器和阀门法兰的螺栓、螺钉、螺母或双头螺栓。参见规范 A962/A962M 用于螺栓连接的定义。该材料需要特殊处理，不适用于一般用途。 1.2 以下引用的一般要求对于本规范的应用是必不可少的: 规格 A962/A962M . 1.3 提供补充要求供买方选择使用。只有当买方在采购订单或合同中单独规定时，补充要求才适用。 1.4 本规范以英寸磅单位和国际单位制表示；但是，除非采购订单或合同规定了适用的“M”规格名称（国际单位制），否则应采用英寸磅单位。 1.5 以国际单位制或英寸表示的数值- 磅单位应单独视为标准单位。在正文中，国际单位制显示在括号中。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值合并可能导致不符合标准。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification 2 covers five grades of bolting materials with twelve classes of yield strength ranging from 50 to 120 ksi [345 to 827 MPa] for use in high-temperature service for bolting components, such as bolts, screws, nuts, or studs, for pressure vessel and valve flanges. See Specification A962/A962M for the definition of bolting. The material requires special processing and is not intended for general purpose applications. 1.2 The following referenced general requirements are indispensable for application of this specification: Specification A962/A962M . 1.3 Supplementary Requirements are provided for use at the option of the purchaser. The Supplementary Requirements shall only apply when specified individually by the purchaser in the purchase order or contract. 1.4 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable “M” specification designation (SI units), the inch-pound units shall apply. 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 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.