本标准规定了优质碳素结构钢棒材的分类与代号,订货内容,尺寸、外形及重量,技术要求,试验方法,检验规则,包装、标志和质量证明书。 本标准适用于公称直径或厚度不大于250 mm热轧和锻制优质碳素结构钢棒材。经供需双方协商,也可供应公称直径或厚度大于250 mm热轧和锻制优质碳素结构钢棒材(以下简称钢棒)。 本标准所规定牌号及化学成分也适用于钢锭、钢坯、其他截面的钢材及其制品。
This standard specifies the classification and designation, ordering information, dimensions, shape, mass, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of quality carbon structure steel bars.
This standard applies to hotrolled and forged quality carbon structure steel bars with nominal diameter or thickness not greater than 250 mm.Quality carbon structure steel bars (hereinafter referred to as steel bars) with nominal diameter or thickness greater than 250 mm may also be supplied upon agreement between the purchaser and the manufacturer.
The steel grades and chemical composition specified in this standard also apply to steel ingots, billets, blooms, steel products with other crosssections and their products.