1.1 本规范涵盖了最新修订规范所涵盖的无缝和焊接结构的锻造铁素体、铁素体/奥氏体和马氏体不锈钢配件的两大类WP和CR A960/A960M 不同于这些标准的配件可根据规范的补充要求S58提供 A960/A960M . 1.1.1 WP级配件细分为四个子类:WP-S、WP-W、WP-WX和WP-WU级。它们是按照规范的要求制造的 A960/A960M ，且其压力等级须与 13.2 .WP-S级配件是由无缝产品通过无缝制造方法制造的配件（标有WP-S级符号）；WP-W级配件是指含有焊缝的配件制造或结构焊缝已经过射线照相（标有WP-W);WP-WX级配件是指包含所有焊缝都经过射线照相的焊缝的配件（标有WP-WX级符号）；WP-WU级配件是那些包含所有焊缝都经过超声波测试的焊缝的配件（标有WP-WU级符号）。 1.1.2 CR级配件是按照MSS SP-43的要求制造的，其压力等级应与 13.3 . 1.2 本规范不适用于铸造配件。 1.3 提供了可选的补充要求。如果需要，可以按顺序指定这些中的一个或多个。 1.4 本规范以英寸-磅单位和国际单位制单位表示。但是，除非订单规定了适用的“M”规格名称【SI单位】，否则材料应以英寸-磅单位提供。1.5 以SI单位或英寸-磅单位表示的值应单独视为标准值。在正文中，国际单位制单位显示在括号中。每个系统中陈述的值可能不完全等同；因此，每个系统应独立使用。合并两个系统的值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（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》中确立的国际公认的标准化原则制定的。

1.1 This specification covers two general classes, WP and CR, of wrought ferritic, ferritic/austenitic, and martensitic stainless steel fittings of seamless and welded construction covered by the latest revision of Specification A960/A960M . Fittings differing from these standards may be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M . 1.1.1 Class WP fittings are subdivided into four subclasses: Classes WP-S, WP-W, WP-WX, and WP-WU. They are manufactured to the requirements of Specification A960/A960M , and they shall have pressure ratings compatible with 13.2 . Class WP-S fittings are those manufactured from seamless product by a seamless method of manufacture (marked with class symbol WP-S); Class WP-W fittings are those which contain welds where the fitting fabrication or construction welds have been radiographed (marked with class symbol WP-W); and Class WP-WX fittings are those which contain welds where all welds have been radiographed (marked with class symbol WP-WX); and Class WP-WU fittings are those which contain welds where all welds have been ultrasonically tested (marked with class symbol WP-WU). 1.1.2 Class CR fittings are those manufactured to the requirements of MSS SP-43, and they shall have pressure ratings compatible with 13.3 . 1.2 This specification does not apply to cast fittings. 1.3 Optional supplementary requirements are provided. When desired, one or more of these may be specified in the order. 1.4 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation [SI units], the material shall be furnished to inch-pound units. 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.