ISSN：1003-8620

CN：42-1243/TF

主管：中信泰富特钢集团股份有限公司

主办：大冶特殊钢有限公司

特殊钢 ›› 2013, Vol. 34 ›› Issue (2): 45-47.

• 工艺技术 • 上一篇    下一篇

200 t LD-LBAr-CC流程生产低碳铝镇静钢的洁净度

易正明，肖慧   

  1. 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室，武汉 430081
  • 收稿日期:2012-10-22 出版日期:2013-04-01 发布日期:2022-10-08
  • 作者简介:易正明(1973-)，男，博士,副教授，2007年中南大学毕业, 炼钢工艺技术和新产品开发。

Cleanliness of Low Carbon Al-Killed Steel Produced by 200 t LD-LBAr-CC Flow Sheet

Yi Zhengming ，Xiao Hui   

  1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081
  • Received:2012-10-22 Published:2013-04-01 Online:2022-10-08

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摘要： 钢厂试验的低碳铝镇静钢(/%:0.036～0.037C、0.009Si、0.173～0.176Mn、0.012～0.013P、0.005～0.006S)生产流程为200 t LD转炉-钢包吹Ar精炼(LBAr)-230 mm×1 300 mm板坯连铸工艺。通过LD转炉挡渣出钢,并加入Mn-Fe、铝丸进行预脱氧和合金化3 min,钢水T[O]和[N]分别为91.8×10-6和19.4×10-6,在氩站经10～12 min 25～45 m3/h流量吹氩和3～5 min 15～25 m3/h的软吹氩后,T[O]降至42.3×10-6,[N]为22.0×10-6,中间包和铸坯T[O]分别为38.3×10-6和28.9×10-6,[N]分别为23.6×10-6和26.5×10-6。该流程生产的铸坯满足T[O]≤30×10-6的内控要求。经氩站精炼后,显微夹杂物去除率为30.0%,而大型夹杂物去除率达58.7%;显微夹杂物主要为脱氧产物Al2O3;大型夹杂物主要为SiO2、Al2O3、SiO2-Al2O3、CaO-SiO2-Al2O3。

关键词: 低碳铝镇静钢, LD-LBAr-CC流程, 钢包吹氩, 洁净度, 夹杂物

Abstract: The production flow sheet for test low carbon Al-killed steel (/% : 0.036-0.037C, 0.009Si, 0.173-0.176Mn, 0.012-0.013P, 0.005-0.006S) at steel works is 200 t LD converter-ladle blowing argon (LB Ar) -230 mm x 1 300 mm slab casting process. With slag stopping at LD converter tapping, adding Mn-Fe and aluminium bullet to deoxidizing and alloying for 3 min, the liquid T[O] and [N] are respectively 91.8 x 10-6 and 19.4 x 10-6, blowing argon with flow rate 25-45 m3/h for 10-12 min then soft blowing argon with 15-25 m3/h for 3-5 min in ladle at argon station, the T[O] decreases to 42.3 x 10-6 and the [N] is 22.0 x 10-6, in tundish liquid and in slab the T[OJ is respectively 38.3 x 10-6 and 28.9 x 10-6 and the [N] is respectively 23.6 x 10-6 and 26.5 x 10-6. The slab produced by this flow sheet meets the internal control requirement i. e. T[O] ≤ 30 x 10-6. After refining at argon station the amount of micro-inclusions in steel decreases by 30.0%, while the amount of large inclusions decreases by 58.7% ； the micro-inclusions in steel are mainly deoxidation product A12O3, while the large inclusions in steel are mainly SiO2, Al2O3, SiO2-Al2O3 and CaO-SiO2-Al2O3.

Key words: Low Carbon Al-Killed Steel, LD-LBAr-CC Flow Sheet, Ladle Blowing Argon, Cleanliness, Inclusions

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