冷轧高硅双相钢基料氧化铁皮分析及控制

Analysis and Control of Iron Oxide Scale in Cold Rolled High Silicon Dual Phase Steel Substrate

4.0 mm规格供冷轧高硅钢表面存在较严重致密的红色氧化铁皮,且有一定的厚度,经过热酸洗试验,低倍镜下可见其表面存在一定的粗糙度,且有黑点缺陷残留,影响客户使用。通过分析,高硅钢表面氧化铁皮为含硅成分的Fe2SiO4橄榄石相氧化铁皮,该铁皮在1173℃以下呈熔融状态,很难通过除鳞系统进行去除。通过高温快烧、降低空燃比等措施可减少加热炉内氧化铁皮产生;通过提高除鳞时温度保持氧化铁皮液态,降低除鳞时轧制速度,可有效去除橄榄石相氧化铁皮,提高表面质量。

The 4.0 mm specification for cold-rolled high silicon steel has a severe and dense red oxide scale on the surface,with a certain thickness.After hot acid washing test,it can be seen under low magnification that there is a certain roughness on the surface,and there are residual black spot defects,which affect customer use.Through analysis,the surface oxide scale of high silicon steel is Fe2SiO4 olivine phase oxide scale containing silicon components,which is in a molten state below 1173℃and difficult to remove through a descaling system.By measures such as high temperature rapid burning and reducing the air fuel ratio,the production of iron oxide scale in the heating furnace can be reduced.By increasing the temperature during descaling to maintain the liquid state of the iron oxide scale and reducing the rolling speed during descaling,the olivine phase iron oxide scale can be effectively removed and the surface quality can be improved.