研究了140 t LD-LF-RH-CC流程冶炼超低氧钢时精炼过程铝脱氧钢中夹杂物的变化。试验钢出钢过程加足够的铝脱氧,以尽快降低钢液中溶解氧。为使Al_2O_3转变为钙铝酸盐夹杂,选用CaO-Al_2O_3精炼渣系,渣中含3.00%～8.42%SiO_2。结果表明,精...研究了140 t LD-LF-RH-CC流程冶炼超低氧钢时精炼过程铝脱氧钢中夹杂物的变化。试验钢出钢过程加足够的铝脱氧,以尽快降低钢液中溶解氧。为使Al_2O_3转变为钙铝酸盐夹杂,选用CaO-Al_2O_3精炼渣系,渣中含3.00%～8.42%SiO_2。结果表明,精炼时钢液中夹杂物的变化趋势为:纯Al_2O_3→尖晶石夹杂→CaO-Al_2O_3-MgO复合夹杂物,炉渣中8.42%SiO_2炉次夹杂物转变慢于3.00%SiO_2炉次;当炉渣CaO/Al_2O_3为1.60时,钢中夹杂物大多转变为低熔点CaO-Al_2O_3-MgO复合夹杂。精炼渣的成分控制应为(%):55～60CaO,35～40Al_2O_3,5～10MgO。展开更多
Desulfurization performance with low binary basicity refining slag in 72 grade tire cord steel was calculated using FactSage and it is found that sulfur content in steel decreases with the increase of basicity of slag...Desulfurization performance with low binary basicity refining slag in 72 grade tire cord steel was calculated using FactSage and it is found that sulfur content in steel decreases with the increase of basicity of slag, MgO content in slag and slag/steel ratio while sulfur partition ratio between slag and steel increases gradually with the increase of basicity of slag as well as MgO content. Experiments were carried out and the results are of great agreements with theoretical calculation. Then industrial application tests were performed in a domestic plant and good results were achieved. Sulfur content in steel decreases gradually during refining process, as a result, sulfur content in the billets is controlled in the range of 0.007 1%-0.008 1%. Sulfur content in steel refined with slag basicity of 1.21 is lower than that of 1.02, while the plasticity of oxide compound inclusions is a little better controlled in low basicity heats. Using refining slag with basicity of 1.0-1.2 and MgO content of 5%-10% and reducing the slag takeover of LD are favorable for improving the desulfurization performance and the plasticity of inclusions during the industrial production.展开更多
文摘研究了140 t LD-LF-RH-CC流程冶炼超低氧钢时精炼过程铝脱氧钢中夹杂物的变化。试验钢出钢过程加足够的铝脱氧,以尽快降低钢液中溶解氧。为使Al_2O_3转变为钙铝酸盐夹杂,选用CaO-Al_2O_3精炼渣系,渣中含3.00%～8.42%SiO_2。结果表明,精炼时钢液中夹杂物的变化趋势为:纯Al_2O_3→尖晶石夹杂→CaO-Al_2O_3-MgO复合夹杂物,炉渣中8.42%SiO_2炉次夹杂物转变慢于3.00%SiO_2炉次;当炉渣CaO/Al_2O_3为1.60时,钢中夹杂物大多转变为低熔点CaO-Al_2O_3-MgO复合夹杂。精炼渣的成分控制应为(%):55～60CaO,35～40Al_2O_3,5～10MgO。
基金Item Sponsored by National Key Basic Research and Development Program of China(2010CB30806)Central South University Postdoctoral Funded Project of China(120961)
文摘Desulfurization performance with low binary basicity refining slag in 72 grade tire cord steel was calculated using FactSage and it is found that sulfur content in steel decreases with the increase of basicity of slag, MgO content in slag and slag/steel ratio while sulfur partition ratio between slag and steel increases gradually with the increase of basicity of slag as well as MgO content. Experiments were carried out and the results are of great agreements with theoretical calculation. Then industrial application tests were performed in a domestic plant and good results were achieved. Sulfur content in steel decreases gradually during refining process, as a result, sulfur content in the billets is controlled in the range of 0.007 1%-0.008 1%. Sulfur content in steel refined with slag basicity of 1.21 is lower than that of 1.02, while the plasticity of oxide compound inclusions is a little better controlled in low basicity heats. Using refining slag with basicity of 1.0-1.2 and MgO content of 5%-10% and reducing the slag takeover of LD are favorable for improving the desulfurization performance and the plasticity of inclusions during the industrial production.
