06Cr18Ni5Mn7Cu3N奥氏体不锈钢带脱皮缺陷的成因分析及预防工艺措施

Analysis on Formation Cause of Peeling Defect of Austenite Stainless Steel 06Crl8Ni5Mn7Cu3N Strip and Preventing Process Measures

2.5mm热轧06Cr18Ni5Mn7Cu3N奥氏体不锈钢带的生产流程为70 t EAF-70 t底吹GOR转炉-LF-180mm×1 240 mm板坯CC-热轧工艺.酸洗后2.5 mm热轧带距边部约30 mm处出现宽度≤20 mm,深≤0.06 mm的脱皮缺陷.分析表明,由于在热轧加热过程中加热温度过高（1 200～1 260℃）,以及加热时间过长（超过210 min）使得富铜相在晶界处大量析出致使在热轧过程形成脱皮缺陷.通过将加热温度调整为1200～1240℃,加热时间为150～210 min后,产生脱皮缺陷的带材由7％降至0.5％以下,产品质量得到了显著的提升.

The production flow sheet for 2. 5 mm hot rolled strip of austenite stainless steel 06Crl8Ni5MnTCu3N is 70 t EAF-70 t bottom-blown GOR converter-LF-180 mm× 1 240 mm slab CC-hot rolling process. The peeling defects with width≤20 mm and depth ≤0. 06 mm occur at distance about 30 mm from edge of pickled 2. 5 mm hot-rolled strip. Analy- sis show that due to higher heating temperature during heating process for hot rolling （ 1 200 - 1 260℃） and longer holding time during heating （more than 210 min） led to the formation of a large amount of copper-rich phase precipitated at grain boundary, as a result the peeling defect forms during hot rolling. With improving heating temperature 1 200- 1 240℃ and holding time 150 - 210 min, the forming strip peeling defect ratio decreases from original 7% to less than 0. 5% , the quali- ty of products enhances markedly.