1.1 本规范涵盖热加工或冷加工棒材，锻造棒材除外( 注1 )，适用于机械加工工艺。它包括圆形、正方形和六边形，是更常用的无不锈钢加工钢类型，特别设计用于最佳可加工性和一般腐蚀和高温环境。除自由加工类型以外的不锈钢棒包含在单独的规范中( 注2 ). 1.2 本规范以英寸磅单位和国际单位表示；但是，除非采购订单或合同规定适用 M 规格名称（SI单位），应采用英寸磅单位。以英寸-磅单位或SI（公制）单位表示的数值应单独视为标准: 在文本和表格中，SI单位显示在[括号]中。每个系统中规定的值可能不完全相等: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规范。 注1: 有关重新汇聚的钢筋，请参见规范 第314页 . 注2: 对于非自由加工不锈钢棒，参见规范 第276页 . 1.3 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》中确立的国际公认标准化原则制定的。

1.1 This specification covers hot-finished or cold-finished bars, except bars for forging ( Note 1 ), suitable for machining processes. It includes rounds, squares, and hexagons in the more commonly used types of stainless free-machining steels designed especially for optimum machinability and for general corrosion and high-temperature service. Stainless steel bars other than the free-machining types are covered in a separate specification ( Note 2 ). 1.2 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. The values stated in either inch-pound units or SI (metric) units are to be regarded separately as standard: within the text and tables, 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 nonconformance with the specification. Note 1: For bars for reforging, see Specification A314 . Note 2: For non-free machining stainless bars, see Specification A276 . 1.3 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.