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为了降低气保焊丝钢ER70S-6最终产品的氮氧含量,提高焊丝的成材率,改善焊丝的焊接冶金性能,国内某生产厂实行转炉、精炼、连铸全流程控氮氧措施。结果表明:转炉环节氮质量分数降低了3×10-6,精炼工序氮质量分数降低了4×10-6,连铸大包至中包氮质量分数降低了2×10-6,全工艺环节总氮质量分数下降了约11×10-6,轧材成品全氧质量分数平均下降了27×10-6。在夹杂物及组织方面,低倍金相图片显示夹杂物的总体数量有所减少,存在形态由颗粒状及链状变为不连续的点状,分布状态由聚集态向弥散转变,同时高倍金相图片显示,晶粒略有增大,晶粒度有所下降,夹杂物沿晶界析出状况有所好转。
In order to reduce the nitrogen and oxygen content of the gas-insulated wire ER70S-6 final product, increase the wire drawing rate, and improve the welding metallurgy performance of the wire, a domestic production plant implements the nitrogen-oxygen control measures in the whole process of converter, refining and continuous casting. The results showed that the nitrogen content of the converter decreased by 3 × 10-6, the nitrogen content of the refining process decreased by 4 × 10-6, the mass fraction of nitrogen from the bale to the middle package decreased by 2 × 10-6, the whole process Total nitrogen mass fraction dropped by about 11 × 10-6, the finished product oxygen content decreased by an average of 27 × 10-6. In terms of inclusions and microstructure, the low magnification phase images show a decrease in the total number of inclusions. The morphology changes from granular and chain to discontinuous points, and the distribution changes from aggregation to dispersion. At the same time, The phase diagram shows that the grain size slightly increases, the grain size decreases, and the inclusion precipitates along the grain boundary.