精炼及连铸过程影响钛收得率的因素分析

Study on factors affecting titanium yield in LF refining and continuous casting

通过试验及热力学计算，分析了高强钢生产时精炼及连铸过程，影响Ti收得率的因素。结果表明：液相线温度以上，钢中酸溶铝的质量分数为0．025％时，钢液中0．02％的Ti不能与溶解氧反应，但能被大气中的氧二次氧化，板坯中发现氧化钛夹杂物；精炼及连铸过程中，钛与钢液及大气中的氮均不能发生反应；1600℃温度下，当w（Si）=0．25％时，钢液中钛的质量分数为0．02％时有可能与渣中的SiO2反应生成Ti的氧化物进入渣中。提出了稳定控制钢中Ti含量的措施，并应用于生产实践，实现了控制Ti质量分数的波动范围为（0～2）×10^-5。

Factors affecting titanium yield for high strength steel in LF refining and continuous casting are analyzed by experimental data and thermodynamic calculation. Results show that when the hot metal temperature rises above the liquid phase line temperature and the quality fraction of acid-soluble aluminum comes to 0.025 % the 0.02% titanium in the liquid steel can not react with the soluble oxygen, and in the process of refining and continuous casting titanium can neither react with nitrogen in the hot metal nor with that in the atmosphere, and when silicon quality fraction arrives at 0. 25% at 1 600 ℃ the titanium of 0. 02 % quality fraction in the hot metal can react with SiO2 in the slag and thus titanium oxides generate and they will exist in the slag. On the basis of the experiments measures for controlling the stability of titanium content are put for ward and thus the purpose of controlling the deviation of titanium quality fraction within the limit of 0-20 × 10^-6 is realized in the actual production.