摘要
在空气中利用中频感应炉加热,研究了以Si 为抗氧化剂的Al2O3-C耐火材料对超低碳钢的增碳 作用。利用高频燃烧红外吸收法测定钢样中的碳含 量,并对用后耐火材料进行了SEM和EDS分析。研 究结果表明:钢熔化后,炭的直接溶解机制造成钢水 中碳含量迅速增加;随着保温时间的增加,“渗透- 溶解”机制对钢水增碳占主导作用;同时,耐火材料 与钢水接触部位生成反应脱炭层,反应脱炭层隔离了 钢水与耐火材料的直接接触,进而减缓并停止耐火材 料对钢水的增碳作用;空气中的氧通过渣向钢水中传 递,氧和钢水中的碳发生反应对钢水产生脱炭作用, 同时,碳氧平衡决定了在钢水的碳含量很低时,脱炭 反应接近于平衡状态,钢水中的碳含量趋于平衡。
Ultra low carbon (ULC) steel was put into alumina-graphite crucibles and then they were heated at 1600 ℃ for 120 min in medium frequency induction furnace in air atmosphere.Si powder was antioxidant in alumina-graphite crucibles.The carbon content of IF steel was examined by high frequency combustion infrared absorption method and the hot face refractory after experiment was investigated by scanning electron microscope (SEM) and energy dispersion spectroscopy (EDS).It was found that carbon content of the IF liquid steel specimens as soaking time progress show the trend:increasing,decreasing and staying stable.Carbon pick-up was controlled by graphite dissolution and penetration-dissolution mechanism.A decarburized reacted layer formed and separated molten steel from refractories.This layer inhabited direct dissolution,also decreased and stopped penetration,so carbon pick-up decreased and stopped.Meanwhile,decarburization of oxygen through flux and liquid layer started to reduce carbon content in molten steel.
出处
《耐火材料》
CAS
北大核心
2004年第6期399-401,406,共4页
Refractories
