镁处理对含Ti螺纹钢中夹杂物的影响

炼钢 ›› 2022, Vol. 38 ›› Issue (4): 78-83.

镁处理对含Ti螺纹钢中夹杂物的影响

吴静，田俊，王德永，屈天鹏，侯栋，胡绍岩

苏州大学沙钢钢铁学院，江苏苏州 215137

出版日期:2022-08-05 发布日期:2022-07-29

Effect of magnesium treatment on inclusion of reinforced bar containing Ti

Online:2022-08-05 Published:2022-07-29

摘要/Abstract

摘要：

对含Ti高强度螺纹钢进行了镁处理试验，分析了镁处理前后试样中夹杂物的成分和尺寸的变化，并用FactSage软件对夹杂物的形成和析出进行了计算。结果表明：加Mg前试样中夹杂物主要是Al₂O₃、以Al₂O₃为核心的TiN和TiN，加Mg后试样中夹杂物主要是Al₂O₃、MgO·Al₂O₃、以Al₂O₃或MgO·Al₂O₃为核心的TiN和TiN。钢中氧含量越高，越容易形成Al₂O₃，氧含量越低，越容易形成MgO；Al含量越高，越不容易形成MgO。TiN在钢液凝固过程中可以以氧化物为核心形核析出或者单独析出。镁处理后试样中夹杂物尺寸减小。MgTi₂O₄主要是在Mg含量较高和温度较低的情况下形成，试样中MgTi₂O₄主要是在凝固过程形成。

关键词: 螺纹钢, 镁处理, 夹杂物, 析出

Abstract:

The experiment of magnesium treatment of high strength rebars containing Ti was carried out by vertical resistance furnace in the laboratory. The changes of composition and size of inclusions of the samples before and after magnesium treatment were analyzed, and the formation and precipitation of inclusions were calculated using FactSage software. The results showed that the inclusions of the sample before Mg addition were Al₂O₃、TiN-Al₂O₃and TiN, and after Mg treatment, the inclusions were Al₂O₃、MgO·Al₂O₃、TiN-Al₂O₃、TiN-MgO·Al₂O₃and TiN. It was easy to form Al₂O₃in the steel with high oxygen content, on the contrary, the MgO was formed easily. And, It was difficult to form MgO inclusion in the steel containing higher Al content. TiN inclusion could be precipitated on the oxide or just precipitated during solidification of steel. The size of inclusion decreased after magnesium treatment. The MgTi₂O₄ inclusion was mainly formed under the condition of the steel with high Mg content and low temperature, and this kind of inclusion in the sample was mainly precipitated during solidification.

Key words: rebars, Mg treatment, inclusion, precipitate

吴静, 田俊, 王德永, 屈天鹏, 侯栋, 胡绍岩. 镁处理对含Ti螺纹钢中夹杂物的影响[J]. 炼钢, 2022, 38(4): 78-83.

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