热钢或铸钢指定化学分析的产品分析允许偏差

[中文适用范围]： 作为热分析或铸造分析的补充，可以对半成品或成品钢进行产品分析。用于产品化学分析的钢材取样的定义和方法，请参阅 sAE J408。产品分析是对半成品或成品钢材进行的化学分析，以确定是否符合规范要求。指定化学成分的范围通常会扩大，以考虑与分析再现性和钢的异质性相关的偏差。个别测定结果可能与指定的熔炼或铸造分析范围或限值有所不同，如表 1 至 5 所示。熔炼或铸造中任何元素的多次测定结果不得高于或低于规定范围（铅除外）。表 1 至表 5 提供了各种钢材形式和成分类型的允许限值。沸腾钢或封盖钢不受产品分析限制，因为它们的化学成分本质上变化很大。此外，对于再磷和硫，因为这些元素的分离程度。硼不受产品分析公差的限制。 [外文原描述]： Supplementary to the heat or cast analysis, a product analysis may be made on steel in the semifinished or finished form. For definitions and methods of sampling steel for product chemical analysis, refer to SAE J408.A product analysis is a chemical analysis of the semifinished or finished steel to determine conformance to the specification requirements. The range of the specified chemical composition is normally expanded to take into account deviations associated with analytical reproducibility and the heterogeneity of the steel. Individual determinations may vary from the specified heat or cast analysis ranges or limits to the extent shown in Tables 1 through 5 . The several determinations of any element in a heat or cast may not vary both above and below the specified range except for lead. Tables 1 through 5 provide permissible limits for various steel forms and composition types.For rephosphorized and resulfurized steels, the product analysis tolerance limits are not applicable to phosphorus and sulfur because of the degree to which these elements segregate.Boron is not subject to product analysis tolerances.Cross Reference: ASTMA480/A480/M,ASTMA513,ASTMA519,ASTMA6,J408