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通过氧化增重的方法,采用热重分析仪对Si含量为0.3%和0.6%的低碳钢热轧板料在300~1200℃下的增重进行了研究。结果表明:温度越高氧化铁皮厚度越大,氧化越严重;在不同氧化温度条件下,氧化增重曲线均呈抛物线型,说明在氧化初期,氧化性气氛与钢基体发生化学反应。随着氧化铁皮的生成,变成以扩散反应为主。含Si量为0.6%的钢比含Si量为0.3%的钢单位面积上的氧化铁皮增重少,这说明Si含量越高,氧化增重越少。同时含Si热轧板料高温加热过程生成的Fe_2SiO_4液相层能降低钢基体的氧化程度。
The weight gain of low carbon steel hot rolled sheet with Si content of 0.3% and 0.6% at 300 ~ 1200 ℃ was studied by TG method. The results show that the higher the temperature is, the larger the thickness of the scale is, the more serious the oxidation is. Under different oxidation temperatures, the oxidation weight gain curve shows a parabolic curve, which shows that the initial reaction is between the oxidation atmosphere and the steel matrix. With the formation of scale, it becomes diffusion reaction. Steel with a Si content of 0.6% has a smaller weight gain than a 0.3% by weight steel, which means that the higher the Si content, the less the oxidation weight gain. Meanwhile, the Fe_2SiO_4 liquid phase generated during the high temperature heating process of the hot rolled sheet with Si can reduce the oxidation degree of the steel substrate.