1.1 本规范涵盖石油和天然气压力容器和油田设备用改性高强度合金钢锻件以及轧制和锻造棒材。看 附录X1 该材料预期用于的石油和天然气产品规格包括但不限于以下内容: 1.1.1 API 6A井口和采油树设备规范和勘误表， 1.1.2 API RP 6AR井口和采油树设备修理和再制造的推荐实施规程， 1.1.3 API 16A钻穿设备规范， 1.1.4 API 16R海洋钻井隔水管联轴器规范， 1.1.5 API 17D海底井口和采油树设备规范和勘误表， 1.1.6 API 8C钻井和生产起重设备规范。 1.2 当需要额外的测试或检查时，提供了补充要求。这些仅适用于买方在订单中单独指定的情况。 1.3 在本说明书的要求与引用的通用说明书的要求发生冲突的情况下，以本说明书为准。如果产品说明书的要求或本说明书的要求与采购订单或合同的更严格的要求发生冲突，则以采购订单或合同为准。如果采购订单或合同要求以任何方式违反了产品规范或本规范的要求，例如通过放弃测试要求或降低测试要求的严格性，则不应优先。如果API标准和术语之间存在术语冲突 A941 、术语 A941 应适用定义。 1.4 单位- 以SI单位或英寸-磅单位表示的值应单独视为标准值。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。 1.5 本规范以英寸-磅单位和国际单位制单位表示；但是，除非采购订单或合同规定了适用的 米 规格名称（SI单位），应适用英寸-磅单位。 1.6 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。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》中确立的国际公认的标准化原则制定的。

1.1 This specification covers modified high-strength alloy steel forgings and rolled and forged bar for oil and gas pressure vessels and oilfield equipment. See Appendix X1 . Oil and gas product specifications for which this material is intended include, but are not limited to, the following: 1.1.1 API 6A Specification for Wellhead and Christmas Tree Equipment and Errata, 1.1.2 API RP 6AR Recommended Practice for Repair and Remanufacture of Wellhead and Christmas Tree Equipment, 1.1.3 API 16A Specification for Drill-Through Equipment, 1.1.4 API 16R Specification for Marine Drilling Riser Couplings, 1.1.5 API 17D Specification for Subsea Wellhead and Tree Equipment and Errata, 1.1.6 API 8C Specification for Drilling and Production Hoisting Equipment. 1.2 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order. 1.3 In the case of conflict between a requirement of this specification and a requirement of referenced general specifications, this specification takes precedence. In the case of conflict between a requirement of the product specification or a requirement of this specification and a more stringent requirement of the purchase order or contract, the purchase order or contract take precedence. The purchase order or contract requirements shall not take precedence if they, in any way, violate the requirements of the product specification or this specification, for example, by the waiving of a test requirement or by making a test requirement less stringent. In the case of conflict in terminology between API standards and Terminology A941 , Terminology A941 definitions shall be applied. 1.4 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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 nonconformance with the standard. 1.5 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. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 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.