钢包自开率的影响因素及改善措施

统计分析了LZ20Mn2、20MnV6、20MnTiB等钢种钢水在钢包中停留时间(<135 min～>240 min),出钢温度(<1 640℃～>1 650℃),连铸平台钢水温度(<1 540℃～>1 580℃),钢中Mn含量(<0.5%～>1.3%)对70 t钢包水口自开率的影响。得出随着钢包停留时间延长,出钢温度和连铸平台钢水温度提高,以及钢中Mn含量的增加,钢包自开率可由98.8%降至76.8%。通过加强引流砂用前烘烤,及时清理钢包中残钢残渣,清扫水口,钢水在钢包中平均停留时间由原180 min降至160 min,使钢包自开率由原88.4%上升到97.3%。

Influence Factors on Ladle Free-Opening Rate and Improving Measures

The Influence of liquid residence time in ladle (<135 min ~ >240 min), tapping temperature (<1 640 ℃ - > 1 650 ℃), temperature of liquid in ladle at casting station (<1 540 ℃～ >1 580 ℃), Mn content in steel (< 0. 5% - >1. 3%) for steelmaking the low carbon steels such as LZ20Mn2, 20MnV6 and 20MnTiB on free-opening rate of a 70-t ladle is statistically analyzed. It is obtained with prolonging residence time, increasing tapping temperature and temperature of liquid in ladle at casting station, and increasing Mn content in steel the ladle free-opening rate may decrease from 98. 8% to 76. 8%. With improving bake of packing sand for ladle sliding gate, in time clearing residual steel and slag in ladle, cleaning up nozzle, and decreasing average residence time of liquid in ladle to 160 min from original 180 min, the ladle free-opening rate increases to 97. 3% from original 88. 4%.