摘要
采用光学显微镜（OM）和扫描电子显微镜（SEM）的试验方法分析了低碳冷镦钢空气气氛下连续氧化行为及精轧温度和吐丝温度对盘条表面氧化铁皮厚度及相结构的影响。结果表明，低碳钢盘条在700℃以下氧化速率非常缓慢，970，1160℃为快速氧化起点，氧化速率急剧增加；随着精轧温度和吐丝温度的降低，氧化铁皮的Fe2O3层厚度变化较小、Fe2O3层厚度增加、FeO层厚度显著降低，氧化铁皮总厚度减小，将现场生产精轧温度控制在890—950℃、吐丝温度控制在890～920℃，能够获得氧化铁皮厚度为15～30μm、FeO含量为65％～80％的最佳控制目标；先共析或共析转变生成Fe3O4 是机械除鳞率降低的主要原因，控制450～550℃的保温时间或冷速是提高机械除鳞率的有效方法。
By using optical microscope （OM） and scanning electron microscope （SEM）, effect of finish rolling temperature and laying temperature on the thickness and phase structure of surface oxide scale of hot rolling wire rod, and continuous oxidation behavior in air atmosphere of low carbon cold heading steel were analyzed. The results showed that the oxidation rate is very slow below 700 ℃, but had a sharp increase when the temperature were 970 ℃ and 1 160 ℃. With the reduction in the finish roiling temperature and laying temperature, there was little change for the thickness of Fe3O4 and the thickness of Fe2O3 increased, while the thickness of FeO decreased significantly and the total thickness of the oxide scale decreased. When the finish rolling temperature and the laying temperature were within 890 -950 ℃ and 890 - 920 ℃ respectively, the thickness of oxide scale was 15 -30 μm and the percentage of FeO was 65% -80%, which was the optimal result. Fe304 generated by the proeutectoid or eutectoid transformation was the main cause of mechanical descaling rate reduction. The control of cooling rate or holding time under 450 - 500 ℃ was an effective method to improve the mechanical descaling rate.
出处
《首钢科技》
2013年第3期30-35,共6页
Shougang Science and Technology
关键词
低碳钢
轧制工艺
氧化铁皮
先共析
共析转变
low carbon steel, rolling mill practice, oxide scale, proeutectoid, eutectoid transfor-mation
作者简介
罗志俊：硕士，工程师。
