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抗硫管线钢生产过程中存在碳、硫、磷元素控制困难,钢铁料消耗高等问题,结合生产数据和热力学计算对其原因进行了分析,并从电弧炉熔炼、合金化、电弧炉出钢预精炼、LF精炼渣系和渣料加入制度等方面提出了改善措施。采用优化的工艺后,电弧炉出钢过程增磷质量分数从32.3×10~(-6)降低至6.6×10~(-6);增碳质量分数从0.038%降低至0.011%;脱硫率从27.0%提高到44.1%,LF精炼过程的脱硫率从84.1%提高到89.5%;钢铁料消耗从1 130kg/t降为1 070kg/t,石灰消耗从85.4kg/t降为33.1kg/t,铝锭消耗从2.6kg/t降为2.1kg/t,氧气消耗从35.1m3/t降为24.4 m3/t,电耗从445.8kWh/t降为422.1kWh/t,生产成本显著降低;LF精炼出站钢液的洁净度明显提高,显微夹杂物面积比降低了29.3%。
In the process of production of the anti-sulfur pipeline steel, the control of carbon, sulfur and phosphorus is difficult and the consumption of steel and iron is high. The reasons are analyzed with the production data and the thermodynamic calculation. From the arc melting, alloying, EAF tapping Refining, LF refining slag system and the addition of slag system put forward the improvement measures. After the optimized process, the mass fraction of increasing phosphorus in the electric arc furnace tapping process decreased from 32.3 × 10 -6 to 6.6 × 10 -6, the mass fraction of carbon increased from 0.038% to 0.011%, and the desulfurization rate decreased from 27.0% to 44.1%, the desulfurization rate of LF refining increased from 84.1% to 89.5%; the consumption of steel material dropped from 1 130kg / t to 1 070kg / t, the lime consumption dropped from 85.4kg / t to 33.1kg / t, The consumption of aluminum ingot dropped from 2.6kg / t to 2.1kg / t, the oxygen consumption dropped from 35.1m3 / t to 24.4 m3 / t, the power consumption dropped from 445.8kWh / t to 422.1kWh / t, and the production cost was significantly reduced. LF refining The cleanliness of the steel outflow increased significantly, reducing the area ratio of micro-inclusions by 29.3%.