1. Handan Iron and Steel Company Quality Inspection Department， Hebei Steel Group， Handan 056015， Hebei， China 2. R&D Management Department， Hebei Iron and Steel Technology Research Institute， Shijiazhuang 052165， Hebei， China
Abstract：Easy encountered transverse cracks in Nb steel plate edge were researched to improve the quality. Though hot pickling detection of slab, metallurgical testing of plate, petrographic analysis of mould powder etc., the origin of slab edge crack defect was confirmed. Slab edge crack mechanism was inductively analyzed. By optimizing continuous casting technology which included process control and optimization of secondary cooling, decreasing Als from 0.045% to 0.025%，adopting mould powder with low viscosity and low melting point for suitable crystallization temperature，and increasing slab straightening zone temperature higher than 900 ℃，the slab corner heat transmission was improved, and then the slab corner cracks and Nb steel edge transverse were controlled.
鲁献辉，马 娥. 连铸工艺对含铌中厚板边裂的影响[J]. 中国钢铁期刊网, 2015, 34(4): 54-59.
LU Xian-Hui，Ma E. Effect of casting process on Nb plate edge crack. Chinese Journal of Iron and Steel, 2015, 34(4): 54-59.
2015, Vol. 34 
