AOD用转炉脱磷铁水冶炼430不锈钢脱碳保铬工艺优化  

Decarburizing and chromium keeping process optimization of AOD refining 430 stainless steel using BOF dephosphorized hot metal

作　　者：翟俊[1,2] 李建民[2,3,4] ZHAI Jun LI Jianmin(Institute for Metallurgical Technology, Center Iron and Steel Research Institute, Beijing 100086, China Technology Center, Shanxi Taigang Stainless Steel Co., Ltd., Taiyuan 030003, China School of Metallurgy, Northeastern University, Shenyang 110819, China Key Laboratory for Ecological Metallurgy of Multimetallic Ores （Ministry of Education）, Shenyang 110819, China)

机构地区：[1]钢铁研究总院冶金工艺研究所,北京100086 [2]山西太钢不锈钢股份公司技术中心,山西太原030003 [3]东北大学冶金学院,辽宁沈阳110819 [4]多金属共生矿生态化冶金教育部重点实验室,辽宁沈阳110819

出　　处：《炼钢》2017年第4期58-62,共5页Steelmaking

摘　　要：采用热力学、物料和热量平衡的计算方法,研究了180 t AOD用转炉脱磷铁水冶炼430不锈钢脱碳前期脱碳保铬的工艺。研究结果表明:合理控制最佳脱碳保铬温度是提高AOD冶炼430不锈钢各项经济技术指标的关键技术。采用优化转炉生产节奏和出钢的保温,保证AOD入炉铁水温度由1 520℃提高至1 580℃;优化AOD脱碳前期合金和辅料加入量,进一步提高了脱碳前期的钢液温度,减少铬的氧化量。通过实施工艺优化措施,AOD用转炉脱磷铁水冶炼430不锈钢经济技术指标得到明显改善,其中铬收得率由92.30%提高到94.64%,冶炼时间缩短9.2 min,还原硅耗降低4.9 kg/t。The decarburizing and chromium keeping process optimization in the early of decarburization of180 t AOD refining 430 stainless steel using BOF dephosphorized hot metal was studied by the calculation methods of thermodynamic,material and heat balance. The results show that the reasonable temperature control of decarburizing and chromium keeping process is key technology for improving the economic and technical indicators of AOD refining 430 stainless. The hot metal temperature into AOD increased from1 520 ℃ to 1 580 ℃ and further improving the molten steel temperature in the early of VOD decarburization were guaranteed. Through the implementation of the process optimization the economic and technical indicators of AOD refining 430 stainless using BOF dephosphorized hot metal can be significantly improved,in which chrome recovery increased from 92. 3 % to 94. 63 %,refining time reduced by 9. 2 min and reduced silicon consumption decreased 4. 9 kg/t.

关 键 词：AOD 脱磷铁水 脱碳保铬 430不锈钢 铬收得率 

分 类 号：TF769.1[冶金工程—钢铁冶金]