轧制工艺对高强耐候钢表面氧化铁皮的影响

某钢铁企业开发铁道用高强耐候钢Q550NH,生产中存在的主要问题为钢卷表面存在大面积红锈状氧化铁皮及柳叶状氧化铁皮压入缺陷。通过采取调整在炉时间、除鳞道次、粗轧出口温度、热卷箱模式等轧制工艺参数,研究了高强耐候钢表面氧化铁皮解决方法。通过提高粗轧出口温度,红锈状氧化铁皮消失;控制粗轧出口温度,缩短在炉时间,增加除鳞道次,并采用直通模式轧制,有利于柳叶状氧化铁皮改善,柳叶状氧化铁皮切除率由3.48%下降至0.2%。

Effect of rolling process on iron oxide scale of high strength weathering resistant steel scale

The high-strength weathering resistant steel Q550NH for railways was developed in a steel enterprise. The main problem in production was that there were large areas of red rusty iron oxide scale and willow foliate iron oxide scale indentation defects on the surface of steel coils. By adjusting the process parameters such as furnace time, descaling pass, exit temperature of rough rolling and coil box mode, the solution of iron oxide scale on the surface of high strength weathering steel was studied. The red rusty iron oxide scale disappeared by increasing the exit temperature of rough rolling. By controlling the outlet temperature of rough rolling, shortening the time in the furnace, increasing the scale removal pass and rolling in straight-through mode, the willow foliate iron oxide scale can be improved and the cut rate of willow foliate iron oxide can be reduced from 3.48% to 0.2%.