摘要
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。
The formation and transformation of inclusion in aluminium killed steel during refining have been studied with extra low oxygen steel steelmaking by 140 t LD - LF - RH - CC flow sheet. A sufficient of aluminium was added in test steel during tapping in order to as soon as decrease solution oxygen in liquid steel, and CaO-Al2O3 refining slag series containing 3.00% - 8.42% SiO2 were selected for Al2O3 transforming to calcium aluminate inclusion. Test results showed that the transformation trend of inclusion in liquid steel during secondary refining was pure Al2O3→spinel→CaO-Al2O3→MgO complex inclusions, the transformation of inclusion in heat with slag containing 8.42% SiO2 was slower than that in heat with slag containing 3.00% SiO2, and as CaO/Al2O3 of refining slag was 1.60, most inclusions in steel transformed to low melting point CaO-Al2O3-MgO complex inclusions. The available ingredient of ladle refining slag is 55% -60% CaO, 35%-40% Al2O3, 5%- 10% MgO.
出处
《特殊钢》
北大核心
2007年第4期30-32,共3页
Special Steel
关键词
超低氧钢夹
杂物精
炼渣
Extra Low Oxygen Steel, Inclusion, Refining Slag
