热轧棒材和线材的表面质量等级

[中文适用范围]： 本标准规定了公称尺寸 dN 为 5 mm 至 200 mm 的热轧圆钢、方钢、六角钢和线材的表面质量交货技术要求。 如果制造商和买方在询价和订购时达成一致，本文件适用于光亮产品和工具钢。 经制造商和买方同意，本文件也可适用于其他特殊型材。 本文件特别适用于工程和结构应用的钢材。 本文件不包括任何表面脱碳允许深度的要求。 注：表面脱碳深度的测定在 ISO 3887 中给出。 钢筋和线材的材料标准可以排除本文件的一种或多种表面质量等级的应用。 它们还可以涵盖与本文件不同的表面质量要求。 在这些情况下，以材料标准的要求为准。 [外文原描述]： This document specifies technical delivery requirements for the surface quality of round bars, squares, hexagons and wire rod in the hot rolled condition with nominal dimensions d N from 5 mm to 200 mm. This document is applicable to bright products and tool steels, if agreed at the time of enquiry and order between manufacturer and purchaser. By agreement between manufacturer and purchaser, this document can also be applied to other special profiles. This document is particularly applicable to steels for engineering and structural applications. This document does not include any requirements for the permissible depth of surface decarburization. NOTE The determination of depth of surface decarburization is presented in ISO 3887. The material standards for steel bars and wire rod can exclude the application of one or other of the surface quality classes of this document. They can also cover requirements for surface quality which deviate from this document. In these cases the requirements of the material standard prevail.