120 t LF采用新型钙线的工业实践
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摘要
为解决现场钙处理时收得率不稳定和钢渣飞溅严重的问题,马鞍山钢铁股份有限公司120 t LF采用新型无缝实芯纯钙线代替实芯纯钙线进行钙处理。通过理论探索,发现新型钙线由于涂敷有纳米硅粉作为中间层,可以更好的延长钙线熔化时间,使其打入钢液深处。通过理论计算,得出新型钙线的理论喂线速度为1.65 m/s。通过现场试验,发现当喂线速度为1.5 m/s时,新型钙线的收得率最高可以达到34.6%,而原钙线平均收得率仅为20.7%。且钢水中喂入新型钙线后可以大幅度减少大尺寸夹杂物,促进CaO-Al_2O_3复合夹杂物转变成为低熔点的C_(12)A_7,更能保证钢水的可浇性。
A new seamless pure calcium wire was boldly used to replace solid core pure calcium wire in 120 t LF of Masteel,in order to solve the problems of unstable yield and serious slag spattering in calcium treatment. It was found that the melting time of the new calcium wire could be prolonged and penetrated into the depth of molten steel due to the coating of nano-silica powder as the intermediate layer through theoretical exploration,and the theoretical feeding speed of the new calcium wire was 1.65 m/s through theoretical calculation. It was found that the highest yield of the new calcium wire was 34.6 % when the feeding speed was 1.5 m/s,while the average yield of the original calcium wire was only 20.7 % through field tests. And the large size inclusions could be greatly reduced and the CaO-Al_2O_3 composite inclusions could be transformed into C_(12)A_7 with low melting point by feeding new calcium wire into molten steel,which could better guarantee the pourability of molten steel.
A new seamless pure calcium wire was boldly used to replace solid core pure calcium wire in 120 t LF of Masteel,in order to solve the problems of unstable yield and serious slag spattering in calcium treatment. It was found that the melting time of the new calcium wire could be prolonged and penetrated into the depth of molten steel due to the coating of nano-silica powder as the intermediate layer through theoretical exploration,and the theoretical feeding speed of the new calcium wire was 1.65 m/s through theoretical calculation. It was found that the highest yield of the new calcium wire was 34.6 % when the feeding speed was 1.5 m/s,while the average yield of the original calcium wire was only 20.7 % through field tests. And the large size inclusions could be greatly reduced and the CaO-Al_2O_3 composite inclusions could be transformed into C_(12)A_7 with low melting point by feeding new calcium wire into molten steel,which could better guarantee the pourability of molten steel.
引文
[1] 吴宝国,郝团伟.南钢钢液钙处理的研究[J].安徽工业大学学报,2011,28(2):121-123.
[2] 张宝,施月明,项利,等.实芯纯钙线在LF精炼过程中的应用[J].特殊钢,2011,32(5):44-46.
[3] 王志刚,李战军,杨荣光,等. 实芯纯钙线在LF精炼工艺的应用研究[J].炼钢,2013,29(4):67-70.
[4] 孙涛,张良明,解养国,等. 纯钙线钙处理收得率的影响因素分析[J].安徽冶金,2018(1):51-53.
[5] 周彦超,马建超,陆建惠.钢包喂实芯钙包芯线工艺的工业实践[J].炼钢,2016,32(1):27-29.
[6] 谢志强,黄志勇,颜根发,等. 钢包喂实芯纯钙包芯线的工业性试验研究[J].安徽冶金,2011(3):5-7.
[7] 颜根发,黄志勇,谢志强,等. 包芯线喂线速度的理论探讨[C]//第18届全国炼钢会议论文集,2014.
[2] 张宝,施月明,项利,等.实芯纯钙线在LF精炼过程中的应用[J].特殊钢,2011,32(5):44-46.
[3] 王志刚,李战军,杨荣光,等. 实芯纯钙线在LF精炼工艺的应用研究[J].炼钢,2013,29(4):67-70.
[4] 孙涛,张良明,解养国,等. 纯钙线钙处理收得率的影响因素分析[J].安徽冶金,2018(1):51-53.
[5] 周彦超,马建超,陆建惠.钢包喂实芯钙包芯线工艺的工业实践[J].炼钢,2016,32(1):27-29.
[6] 谢志强,黄志勇,颜根发,等. 钢包喂实芯纯钙包芯线的工业性试验研究[J].安徽冶金,2011(3):5-7.
[7] 颜根发,黄志勇,谢志强,等. 包芯线喂线速度的理论探讨[C]//第18届全国炼钢会议论文集,2014.