含钛焊丝ER70S-G可浇性研究

THE CAST-ABILITY STUDY ON TI-BEARING STEEL OF ER70S-G

通过对ER70S-G冶炼过程中上水口及浸入式水口结瘤物的分析发现:上水口的结瘤物以Ti_2O_3、Al_2O_3-Ti_2O_3、Al_2O_3-Mg O-Ti_2O_3为主,浸入式水口的结瘤物以Ti N为主。通过控制钢液中氧含量至10×10^(-6)以下,控制w([Ti])/w([Al])至17~22,可以有效降低上水口结瘤中Ti_2O_3含量至10.2%~10.6%,缓解上水口结瘤现象。通过降低钢液中氮含量至(30~40)×10^(-6)范围,同时控制中包过热度至40℃~55℃范围内(ER70S-G液相线温度1 518℃),可以有效阻止Ti N的析出,从而解决浸入式水口结瘤问题。

The clogs of nozzle in ER70S-G smelting process are analyzed. The main clogs of upper nozzle are Ti2O3、Al2O3-Ti2O3、Al2O3-Mg O-Ti2O3 and the main clogs of submerged entry nozzle are Ti N. It can effectively reduce the Ti2O3 content in the upper nozzle to 10. 2% ~ 10. 6% with reducing the oxygen content in the steel less than 10 ×10^-6 and controlling w（ [Ti]）/w（ [Al]） between 17 and 22,the clogging phenomenon of upper nozzle have been relieve. By reducing the nitrogen content of the steel to the range of 30 × 10^-6~ 40 × 10^-6and controlling superheat to within the range of 40 ℃ ~ 55 ℃（ the ER70S-G liquidus temperature is 1 518 ℃） can effectively prevent the precipitation of Ti N,so as to solve the problem of clogging of submerged entry nozzle.