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现行 ASTM A990/A990M-23
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Standard Specification for Castings, Iron-Nickel-Chromium and Nickel Alloys, Specially Controlled for Pressure-Retaining Parts for Corrosive Service 腐蚀性承压部件专用控制的铁镍铬和镍合金铸件标准规范
发布日期: 2023-11-01
1.1 本规范涵盖了按照受限熔融实践、可焊性测试和无损检测(NDE)要求进行特殊处理的铁镍铬和镍合金铸件。 1.2 本规范中包括许多等级的铁-镍-铬和镍合金铸件。由于这些等级在腐蚀性环境中具有不同程度的适用性,买方有责任确定应提供的等级。选择将取决于设计和使用条件、机械性能和耐腐蚀特性。 1.3 以国际单位制或英寸磅单位表示的数值应单独视为标准。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。将两个系统的值结合起来可能会导致不符合标准。 1.3.1 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(SI单位),否则应采用英寸磅单位。在正文中,国际单位制显示在括号中。 1.4 本标准并非旨在解决与其使用相关的所有安全问题(如有)。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践,并确定监管限制的适用性。 1.5 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 covers iron-nickel-chromium and nickel alloy castings specially processed with restricted melt practices, weldability testing, and nondestructive examination (NDE) requirements. 1.2 A number of grades of iron-nickel-chromium and nickel alloy castings are included in this specification. Since these grades possess varying degrees of suitability for service in corrosive environments, it is the responsibility of the purchaser to determine which grade shall be furnished. Selection will depend on design and service conditions, mechanical properties, and corrosion-resistant characteristics. 1.3 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. 1.3.1 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. Within the text, the SI units are shown in brackets. 1.4 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. 1.5 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.
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归口单位: A01.18
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