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一、前言用B_5b钢轧制的矿用11号、12号工字钢,在煤炭部各矿务局享有一定的信誉,自1983年以来,连续几年被部、省评为优质名牌产品。为了保持产品的信誉,必须不断地提高B_5b钢的产品质量。
I. Preface Steel mines No. 11 and No. 12 rolled by B_5b steel enjoy a certain reputation in all coal mines of the Ministry of Coal Mining. Since 1983, they have been rated as high-quality brand-name products by the ministry and the province for several years in a row. In order to maintain the credibility of the product, we must constantly improve the product quality of B_5b steel.