铝镇静钢钙处理后碰撞行为对Al2O3夹杂物变性的作用

钢铁, 2013, 48(9): 37-44.

铝镇静钢钙处理后碰撞行为对Al2O3夹杂物变性的作用

郭靖 ^1, , 程树森 ^2, , 程子建 ^3, , 张英伟 ^4,

1.北京科技大学冶金与生态工程学院,北京100083

2.北京科技大学冶金与生态工程学院,北京100083

3.北京科技大学冶金与生态工程学院,北京100083;酒泉钢铁(集团)有限责任公司,甘肃嘉峪关735100

4.北京科技大学冶金与生态工程学院,北京100083

关键词：夹杂物 , 钙处理 , 变性 , 碰撞 , LF精炼

Effects of Collision Behavior on Ai2O3 Based Inclusion Modification After Calcium Treatment for Aluminium-Killed Steel

GUO Jing ^1, , CHENG Shu-sen ^2, , CHENG Zi-jian ^3, , ZHANG Ying-wei ^4,

1.北京科技大学冶金与生态工程学院,北京100083

2.北京科技大学冶金与生态工程学院,北京100083

3.北京科技大学冶金与生态工程学院,北京100083;酒泉钢铁(集团)有限责任公司,甘肃嘉峪关735100

4.北京科技大学冶金与生态工程学院,北京100083

Keywords： inclusion , calcium treatment , modification , collision , LF refining

对铝镇静钢LF精炼钙处理后不同时期取钢样,通过SEM-EDS观察钢样中夹杂物,分析钙处理后铝镇静钢中夹杂物变性机制,并提出了一种夹杂物变性的碰撞机制:在钙处理后,由于钙浓度在钙气泡周围较高形成了CaO类夹杂物,其与钢液中已有的Al2O3类夹杂物相互碰撞结合在一起,然后二者发生化学反应变性为低熔点的液态夹杂物.通过相图分析从理论上指出:Al2O3类夹杂物可与CaO通过碰撞变性,且其变性机制和控速环节与Al2O3类夹杂物通过与钙发生还原反应的变性不同.夹杂物碰撞使变性速率大大加快,几分钟之内即可良好变性.在本次试验中,约有21％的Al2O3类夹杂物通过与CaO碰撞发生变性.实验室试验和其他研究者的工业试验结果均证明:在二次精炼过程中,通过往钢包中喂入CaO类粉末可以使Al2O3夹杂物变性.

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