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为了顶替进口钢筋,并为外贸提供出口钢筋的资源,我厂从80年开始按英国BS4449—78标准研制高屈服强度钢筋。于81年4月在国内首次用钒微合金化的25Mn
In order to replace imported steel, and provide export resources for foreign trade, I plant from 80 years according to the British BS4449-78 standards developed high yield strength steel. In April 81 in the country for the first time with vanadium micro-alloying 25Mn