1.1 本规范涵盖了一般工程使用的灰铸铁件，其中拉伸强度是主要考虑因素。铸件根据铸铁在单独铸造试棒中的抗拉强度进行分类。 1.1.1 本规范使化学成分服从抗拉强度。 1.2 按照本规范生产的铸件根据在专用试样中获得的最小抗拉强度进行分级，该试样用于标准化冷却速度。在某些铸造截面中形成的抗拉强度可能与试样值不同（参见 X1.2 ). 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值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 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 covers gray iron castings intended for general engineering use where tensile strength is a major consideration. Castings are classified on the basis of the tensile strength of the iron in separately cast test bars. 1.1.1 This specification subordinates chemical composition to tensile strength. 1.2 Castings produced to this specification are graded on the basis of minimum tensile strength obtained in special test coupons designed to standardize cooling rate. The tensile strength developed in certain casting sections may vary from test coupon values (see X1.2 ). 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. 1.4 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.