1.1 本规范涵盖一般应用的碳钢铸件，其最低抗拉强度要求高达70 ksi（485 MPa）。 注1: 本规范涵盖的等级代表适用于通过熔焊与其他钢铸件或锻钢零件组装的材料。这并不意味着所有这些等级都具有相同的可焊性程度，或者可以在所有铸件上使用相同的焊接技术。买方有责任自行制定合适的焊接技术。 1.2 涵盖了几个等级和两个类别的铸钢件，如下所示。所需的等级和等级应由买方规定。 1.2.1 N-1级- 仅化学分析。 1.2.2 N-2级- 热处理但未进行机械测试。 1.2.3 U-60-30级 [415-205] — 机械测试，但未热处理。 1.2.4 60-30年级 [415-205], 65-35 [450-240], 70-36 [485-250]和 70-40 [485-275]-热处理和机械测试。 1.2.5 1级和2级钢铸件应按照 9.2 . 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）。本标准的用户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（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 carbon steel castings for general applications that require up to 70 ksi (485 MPa) minimum tensile strength. Note 1: The grades covered by this specification represent materials that are suitable for assembly with other steel castings or wrought steel parts by fusion welding. It is not intended to imply that all these grades possess the same degree of weldability or that the same welding techniques can be used on all castings. It is the responsibility of the purchaser to establish for himself a suitable welding technique. 1.2 Several grades and two classes of steel castings are covered, as indicated below. The grade and class desired shall be specified by the purchaser. 1.2.1 Grade N-1— Chemical analysis only. 1.2.2 Grade N-2— Heat treated but not mechanically tested. 1.2.3 Grade U-60-30 [415-205] — Mechanically tested but not heat treated. 1.2.4 Grades 60-30 [415-205], 65-35 [450-240], 70-36 [485-250], and 70-40 [485-275]—Heat treated and mechanically tested. 1.2.5 Class 1 and Class 2 steel castings shall be specified in accordance with 9.2 . 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 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.