高铝双相钢氧化特性规律

采用酸洗、冷轧以及高温氧化模拟试验等分析方法，对高铝双相钢的热卷表面铁皮特点以及生长规律进行分析。结果表明，高铝双相钢热轧板表面易于形成鱼鳞状红铁皮缺陷，冷轧后表面容易产生色差形貌，影响表面质量；由于钢中铝元素添加较多，铁皮的界面可捕捉到明显的铝元素富集形貌，在1300℃模拟试样的铁皮界面Al2O3形成黑色颗粒带，颗粒带内铝质量分数最高可达18%以上；铁皮内的铝元素富集情况随着温度的降低逐渐下降，作用层厚度减薄；基于对高铝钢铁皮形成的机理分析提出降低出炉温度、适当降低过程温度等手段来控制鱼鳞状铁皮形成。

Oxidation characteristic of high aluminum bearing double phase steel

The scale characteristics and formation mechanism of high aluminum bearing double phase steel were investigated through pickling line tandem cold rolling mill simulation. The results showed that fish scale type red scale defect is prone to generate at the hot rolled strip surface of high aluminum bearing double phase steel and chromatic aberration defect is prone to form at the cold rolled strip surface，which were affected the surface quality. The Al element enrichment was found at the interface between steel base and scale because of high Al mass fraction. A black particle band of Al2O3 with 20% Al was found at the interface between steel base and scale of the sample when simulated at 1300℃. The enrichment extent of Al could be progressively eliminated by decreasing the heating temperature，with thinner effect layer thickness. Based on the previous formation mechanism research，it was proposed to eliminate fish scale type red scale defect by decreasing the tapping temperature and process temperature.