冷轧基料酸洗后表面黑条纹原因分析

为了解决冷轧基料酸洗后表面出现沿轧制方向具有双向特征的黑色山形条纹缺陷，利用金相显微镜、扫描电镜和能谱对缺陷部位进行微观形貌和成分分析，并对经不同加热工艺的轧制效果进行对比。结果表明，钢中含有较高质量分数的残余元素镍、砷、铜在基体与氧化层间形成酸洗难以去除的网状富集相是造成冷轧基料表面酸洗后山形黑条纹的根本原因。此类富集相需要较长的高温时间形成，黏附于基体表面,甚至沿晶界进入基体，且不易通过除鳞及酸洗工艺去除。通过调整配矿结构和缩短铸坯在炉时间可有效解决此问题。

Cause analysis of black stripe on surface of cold rolling base material after pickling

In order to solve that the base material for cold rolling had two- way characteristics of the black stripe defects in the direction of rolling after pickling, the optical microscopy, scanning electron microscopy and energy spectrum were used to analyze the morphology and composition of defective parts, and the rolling effect by different heating process were compared. The results showed that the fundamental reason for the mountainous black stripe on the surface of the base material for cold rolling after pickling was the mesh enrichment phase between the matrix and the oxide layers formed by the higher quality fraction of the residual elements Ni, As and Cu in steel, which was hard to remove after pickling. This kind of enrichment phase required longer time under high temperature to form, and adhered to the substrate surface and even entered into the substrate along the grain boundary, so it was difficult to remove by descaling and pickling process. This problem can be effectively solved by adjusting the ore distribution structure and shortening the time of slab in the furnace.