常规低碳钢板坯的高速连铸工艺技术

 高速连铸具有显著减少建设投资、大幅提高产量和降低物料消耗等优势。但欧、美及国内多数钢厂均使用中低拉速连铸常规厚度板坯，主要原因是高速连铸拉漏风险增加与卷渣导致的表面质量恶化。为解决上述问题，以日本JFE为代表的钢企开发了一系列关键技术，JFE福山No.5 铸机连铸厚度220 mm低碳钢板坯最大拉速达到3.0 m/min。阐述了国内外常规板坯铸机的高速连铸发展历程。基于JFE福山No.5 CCM和首钢京唐No.3 CCM低碳钢高速连铸实践，综述了高速连铸的3项关键技术，分别是强冷却能力结晶器技术、高速连铸结晶器卷渣控制技术和电磁冶金技术，为生产冷轧薄板钢种为主的钢厂提高铸机拉速提供参考。

Review on high speed conventional slab continuous#br# casting of low carbon steels

Many conventional slab casters in Europe, America and domestic steel companies do not use the high speed casting although it can significantly reduce the equipment investment, improve the productivity and lower the refractory consumption. The main reasons are the increasing risk of the sticking breakout and the deterioration of surface quality due to the mold powder entrapments at high speed casting. To solve these problems, Japanese steel companies (eg. JFE) developed a series of key technologies for high speed casting and the maximum speed of 220 mm thickness low carbon steel slabs for No.5 CCM at JFE Fukuyama works reached 3.0 m/min. The transitions of casting speeds for overseas and domestic slab casters were presented. In addition, three key technologies (strong primary cooling technology, control of mold powder entrapments and application of electromagnetic equipment at high speed casting) were reviewed based on the high speed casting practices for No.5 CCM at JFE Fukuyama Works and No.3 CCM at Shougang Jingtang Works. This review can guide the steel plants to improve their casting speeds whose products are mainly composed of cold rolled sheets.