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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.
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Received: 20 May 2015
Published: 15 September 2015
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2015, Vol. 34 
