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第二重型机器厂于1981年提出NR法即无还原期法炼钢,在5吨和10吨电弧炉进行优质碳钢试炼.取得满意结果后,1982年逐步推广;并于1983年开始试炼Cr、CrMo和SiMn三种常用优质合金结构钢,结果证明也是可行的.至1986年二季度,二重厂电炉车间共炼2172炉,其中低合金钢30炉、高合金钢44炉,总合格率达99.8%.而且电耗较三期冶炼工艺大幅度下降,收到了较好的技术经济效益.
The second heavy machinery factory put forward the NR method in 1981, that is, the non-reduction method steelmaking, 5-ton and 10-ton electric arc furnace for high-quality carbon steel trial .After satisfactory results, gradually promoted in 1982; and began in 1983 test Refining Cr, CrMo and SiMn three kinds of commonly used high-quality alloy structural steel, the results proved feasible.Up to the second quarter of 1986, the dual plant EAF workshop alike 2172 furnaces, of which 30 low-alloy steel, high-alloy steel 44 furnace, total Pass rate of 99.8%. And power consumption than the three smelting process dropped significantly, received a good technical and economic benefits.