Q345B钢带表面氧化铁皮精细控制技术

Fine Control Technology for Oxidation Iron in Q345B Strip Surface

针对Q345B热轧钢带出现表面红色氧化铁皮的情况,分析发现缺陷位置表面粗糙,存在明显的硅元素富集。一系列的对比试验表明,影响表面红色氧化铁皮缺陷的因素是化学成分、工艺温度和除鳞工艺。通过采取优化成分设计、调整热轧工艺温度和除鳞道次等控制措施,明显改善了以Q345B为代表的低合金高强钢表面红色氧化铁皮缺陷。

When the Q345B strip surface has the red iron oxide defect, crucial surface is found on the defect part and the element Si is concentrating. By a series of comparative experiments on the strip line, the actual reasons to bring the red iron oxide defects were orientated. The chemical compositions, process temperature and descaling are the key points. A suggestion was given to get a better surface quality on hot wiled Q345B（HSLA） coil, including with better chemical compositions design, optimized rolling temperature and descaling passes controlling.