【作者】 战东平； 姜周华； 龚伟； 赫冀成；

【Author】 ZHAN Dong-ping,JIANG Zhou-hua,GONG Wei,HE Ji-cheng (School of Materials and Metallurgy,Northeastern University,Shenyang,Liaoning,110004,China)

【机构】 东北大学材料与冶金学院；

【摘要】 研究了轴承钢中TiN夹杂物的形成和去除热力学,并在某钢厂开展了低钛轴承钢的生产试验.结果表明,TiN在凝固过程中可能析出并长大.减少TiN析出的有效方法是在轴承钢液相线温度1724K和固相线温度1598K范围内快速凝固和降低钢中Ti与N含量.脱钛可在转炉内或[O]≥35×10^-6时的出钢脱氧前期进行.通过提高炉渣氧化铝和氧化钛活度比大于20,控制转炉下渣量≤5 kg/t钢,加入炉内的造渣材料中钛含量低于0.1%,可减少LF精炼过程中因钢中[Al]s还原渣中氧化钛导致的钢液增钛.在上述理论指导下,在某厂实现了[Ti]≤25×10^-6的低钛轴承钢的批量生产.更多还原

【Abstract】 The formation and removal thermodynamics of TiN inclusion existed in bearing steel were studied Then based on the theoretic calculation results,the industrial trials of bearing steel with lower titanium content were done in a steel plant.It showed that TiN can be formed and grow up during solidification.The efficient way to reduce the precipitation of TiN was to solidify the steel rapidly from the liquid line temperature 1724 K to the solidus temperature 1598 K and to lower titanium and nitrogen contents in molten steel simultaneously.Titanium can be removed from the molten steel in converter or during tapping when the dissolved oxygen content was higher than 3.5×10^-5.By increasing the activity ratio between aluminum oxide and titanium oxide to bigger than 20,controlling quantity of converter slag in the ladle lower than 5 kilogram per ton steel,and titanium content not more than 0.1 percent in slagging materials added in ladle,titanium pick-up caused by titanium oxide in slag reduced by dissolved aluminum can be decreased in the ladle furnace （LF） refining process.By using the above theoretic results,mass production of the bearing steel with titanium lower than 2.5×10^-5 is achieved in a steel plant.更多还原