ER50-6产品一个批次在细丝拉拔工序出现断丝,采用转炉控氮技术、LF炉精炼技术、连铸保护浇注防止增氮等技术对钢中的氮质量分数进行控制.转炉环节控制出钢w(N)≤0.002 5％,LF炉增氮控制在w(N)≤0.002 0％,连铸保护浇铸增氮控制在w(N)≤0.001 5％.通过各工序采取降氮措施,使氮质量分数实际控制在35×10-6～60×10-6.选择ER50-6高氮与低氮盘条进行对比,高氮盘条比低氮盘条抗拉强度高约18 MPa.采取措施后低氮ER50-6盘条初始强度低,满足后续拉拔工艺需要.%ER50-6 products a batch wire broken in thin wire drawing process.The nitrogen mass fraction is controlled by adopting converter nitrogen control technology,LF refining furnace technology,continuous casting protection pour preventing increase of nitrogen to control nitrogen mass fraction of steel.To control steel w (N) ≤0.002 5％ in converter stage,nitrogen increment is controlled w(N) ≤0.002 0％ in LF furnace,to prevent continuous casting increase nitrogen no more than 0.001 5％ in continuous casting protection pour.Through nitrogen reduction measures in each process,nitrogen mass fraction of the actual control 35 × 10-6 ～ 60 × 10-6.Choose ER50-6 high nitrogen compared with low nitrogen wire rod,the tensile strength of high nitrogen wire rod is higher than that of low nitrogen about 18 MPa.The initial strength of low nitrogen ER50-6 wire rod is low after taking measures,which meet the needs of subsequent drawing process.
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