1.1 本规范 2. 涵盖阀门、法兰、配件和其他主要用于低温服务的承压零件的钢铸件。 1.2 涵盖了几个等级的铁素体钢和一个等级的马氏体钢。分析的选择将取决于设计和使用条件( 注1 ). 所示温度是材料通常需要满足本规范冲击要求的最低温度（见补充要求S51，冲击试验温度）。用户应注意，上述某些牌号的淬透性可能会限制获得所需机械性能的最大尺寸（见 附录X1 ). 等级 常规最低测试 温度，°F[°C] 生命周期评价 −25 [–32] LCB公司 −50 [–46] LCC −50 [–46] LC1 −75 [–59] LC2 −100 [–73] LC2-1 −100 [–73] LC3 −150 [–101] LC4 −175 [–115] LC9 −320 [–196] CA6NM −100 [−73] 注1: 本规范涵盖了与铁素体钢和马氏体钢特别相关的低温要求。根据规范提供的某些等级的奥氏体钢铸件 A351/A351M 已发现适用于低至−300 华氏度[−184 °C]和其他−425 华氏度[−254 °C]。当根据规范进行冲击试验时，可以使用这些等级 A352/A352M 测试的能级和温度由买方和制造商共同商定。作为选择能级和测试温度的指南， 附录X1 应咨询。 1.3 以英寸为单位的数值- 磅单位或国际单位应单独视为标准。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，每个系统必须独立使用。合并两个系统的值可能会导致不符合规范。英寸磅单位适用于按规范订购的材料 A352型 按规范订购的材料的国际单位制 A352M . 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 2 covers steel castings for valves, flanges, fittings, and other pressure-containing parts intended primarily for low-temperature service. 1.2 Several grades of ferritic steels and one grade of martensitic steel are covered. Selection of analysis will depend on design and service conditions ( Note 1 ). The temperature shown is the lowest temperature at which the material ordinarily is required to meet the impact requirements of this specification (see Supplementary Requirement S51, Impact Test Temperatures). Users should note that hardenability of some of the grades mentioned may restrict the maximum size at which the required mechanical properties are obtainable (see Appendix X1 ). Grade Usual Minimum Testing Temperatures, °F [°C] LCA −25 [–32] LCB −50 [–46] LCC −50 [–46] LC1 −75 [–59] LC2 −100 [–73] LC2-1 −100 [–73] LC3 −150 [–101] LC4 −175 [–115] LC9 −320 [–196] CA6NM −100 [−73] Note 1: This specification covers the low-temperature requirements particularly pertinent for ferritic and martensitic steels. Certain grades of austenitic steel castings furnished in accordance with Specification A351/A351M have been found suitable for low-temperature service down to −300 °F [−184 °C] and others down to −425 °F [−254 °C]. These grades may be used when impact tested in accordance with Specification A352/A352M with energy levels and temperatures of test mutually agreed upon between the purchaser and the manufacturer. As a guide to the selection of energy levels and testing temperatures, Appendix X1 should be consulted. 1.3 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. Inch-pound units are applicable for material ordered to Specification A352 and SI units for material ordered to Specification A352M . 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.