Fe-23Mn-2Al-V热轧板边裂的研究.pdfVIP

Fe-23Mn-2Al-V 热轧板边裂的研究 郭亮亮 徐正其 廖洪军 (1. 研究院，宝山钢铁股份有限公司，上海 201900 ； 2. 特钢事业部，宝山钢铁股份有限公司，上海 200940) 1 摘 要 Fe-23Mn-2Al-V 合金作为一种高锰低磁钢常用于制造大型变电设备中的低磁隔板，宝钢股份特钢事业部已 实现采用板坯立式连铸工艺替代原有的模铸生产工艺。近期，在热轧钢板边部发现明显的裂纹，经金相实验和电子 探针分析，裂纹内部无裹渣及夹杂现象；采用Gleeble-3800 热力模拟试验机对连铸坯试样进行高温力学性能试验， 实验结果表明连铸坯高温力学性能良好。鉴于修磨后的连铸坯表面粗糙、难以观察，将连铸坯放入步进式加热炉加 热、除磷后，观察到连铸坯表面存在大量的气孔，是导致热轧板边部裂纹产生的直接原因。可见，热轧板表面边部 裂纹也可能是由连铸坯表面气孔引发。 关键词 Fe-23Mn-2Al-V 连铸板坯 边裂 气孔 Study on Edge Cracking of Fe-23Mn-2Al-V Hot Rolling Plate Guo Liangliang1 Xu Zhengqi1 Liao Hongjun2 (1. Research Institute, Baoshan Iron Steel Co., Ltd., Shanghai, 201900; 2. Special Steel Business Unit, Baoshan Iron Steel Co., Ltd., Shanghai, 200940) Abstract The Fe-23Mn-2Al-V alloy, a type of high manganese and low magnetism steel, is generally used for making low magnetism plate of the largesize transformer. The traditional ingot casting process has been replaced by continuous slab casting in Special Steel Multi-division of Baoshan Iron Steel Co., Ltd. Recently, the edge cracks were found in the hot rolling plates, and inclusions and mould powder were not observed in the cracks by optical microscopy and energy dispersive spectroscopy. The high-temperature tensile test has been conducted to clarify ductility of continuous slab casting using the physical simulation system Gleeble-3800. The tested result showed that the ductility of slab was well in the high-temperature zone. Finally, the pinholes were observed in the slab edge after reheating process, which is the reason for the edge cracks of the hot rolling plate. Therefore, the edge cracking of hot ro