硼元素添加对酸洗板氧化行为的影响

为了分析硼元素对低碳铝镇静钢酸洗板的氧化特性、氧化激活能和界面作用特点,利用差热分析仪系统研究了硼元素对低碳铝系列镇静钢酸洗板的氧化行为。结果表明,添加硼元素后,酸洗板抗氧化性明显降低;氧化激活能由12.02 kJ/mol 降至8.52 kJ/mol,氧化增重速率由0.239%/min增至0.323%/min;高温条件下硼元素出现界面富集,并与硅氧化物形成复合氧化相,因此降低了氧化铁皮的黏附力。同时,含硼钢在1 100 ℃附近存在氧化增重速率明显增大的趋势,抗氧化性不足,导致氧化铁皮厚度明显增加,当氧化铁皮厚度超过临界变形厚度时,易于发生氧化铁皮压入现象。可通过适当降低精轧入口温度以及适当添加硅元素,改善含硼钢表面麻点状氧化铁皮压入缺陷。

Effect of boron element addition on oxidation behavior of pickled plates

To analyze the oxidation characteristics, oxidation activation energy and interface interaction characteristics on low carbon aluminum killed steel, the oxidation behavior of boron on pickled plates of low carbon aluminum killed steel was systematically studied by differential thermal analyzer. The results show that the oxidation resistance of pickled plates decreases obviously after adding boron element, the oxidation activation energy decreases from 12.02 kJ/mol to 8.52 kJ/mol, and the oxidation weight gain rate increases from 0.239%/min to 0.323%/min. At high temperature, boron element appeares interfacial enrichment and forms complex oxidation phase with silicon oxide, thus reducing the adhesion of oxide scale. At the same time, the oxidation weight gain rate of boron-containing steel increases obviously at 1 100 ℃, and the oxidation resistance is insufficient, resulting in the obvious increase of the oxide scale thickness. When the oxide scale thickness exceeds the critical deformation thickness, it is also easy to cause rolled-in oxide scale. The pitted rolled-in oxide scale defect on the surface of boron-containing steel can be improved by appropriately reducing the finish rolling inlet temperature and adding element silicon.