摘要:
介绍了永钢采用110 t电炉→LF精炼→VD精炼→连铸工艺生产超低硫X65QS管线钢硫含量控制的生产实践。各工序硫含量得到严格控制,电炉平均脱硫率16.35%。出钢过程用铝1 kg/t脱氧,同时随钢流加入石灰6 kg/t和精炼合成渣2 kg/t。LF炉采用喂铝线、复合碳化硅和铝豆对渣面扩散脱氧,造高碱度白渣对钢水深脱氧、脱硫,LF炉平均脱硫率89.2%,精炼结束后钢水平均硫含量0.000 93%。LF精炼结束到连铸工序过程平均增硫0.000 1%,最终成品硫含量平均0.000 9%。通过控制入炉料硫含量,提高LF精炼炉深脱硫能力,防止精炼后回硫等措施,生产的超低硫X65QS大圆坯硫含量符合下游客户要求,具备批量生产成品硫含量在0.002%以下的超低硫钢的能力。
关键词:
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超低硫钢 /
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管线钢 /
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精炼深脱硫 /
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脱氧
Abstract:
The production process of sulfur content control during the smelting of ultra-low sulfur X65QS pipeline steel in Yong Gang steel used 110 tons of electric furnace,LF refining,VD refining and continuous casting is present in this paper.The sulfur content at each individual process steep had been strictly controlled and average desulfurization rate is achieved at 16.35% for electric furnace.During tapping aluminum addition is 1 kg/t molten steel for deoxidation,at the same time the lime and synthetic slag for refining are added at rate of 6 kg/t and 2 kg/t,respectively.Al wire is used in the LF furnace,composited Si C and Al shot are added for the slag surface diffusion deoxidization.And the resulting high basicitgy white slag are used for deep deoxidization and desulphurization.Desulphurization rate averages at 89.2%for LF furnace.The average sulfur content is 0.000 93% after LF refining.The average resulfurization is 0.000 1% through the end of LF refining to continuous casting steps.And the end sulfur content is 0.000 9%.By controlling the sulfur content in the charge,improving deep desulfurization in the LF refining furnace,and preventing the resulfurization after refining,the sulfur content of X65QS round bloom is far below specified 0.002% level.
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