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针对中厚板含铌钢容易出现的边部缺陷问题,对含铌钢边部横裂缺陷进行研究,以解决长期困扰中厚板含铌钢边部质量提升的技术瓶颈。通过铸坯热酸洗检测、钢板金相检测、保护渣岩相分析等手段确定铸坯边裂缺陷来源,对铸坯边裂机理进行归纳分析,通过连铸工艺控制与二冷优化等技术优化,控制钢中酸溶铝质量分数从0.045%下降到0.025%、采用低渣熔点低黏度适宜析晶温度的保护渣、提高铸坯矫直区温度大于900℃等措施,有效改善了铸坯角部传热,较好控制了铸坯角部裂纹的发生,使含铌钢边部横裂得到了有效控制。
In order to deal with the defects of the niobium-containing steel in the plate prone to edge defects, the transverse crack defects in the niobium-containing steel were studied to solve the technical bottleneck that long plagued the quality of the niobium-containing steel in the plate. The source of edge crack in slab was determined by means of hot pickling of slab, metallurgical examination of steel plate and analysis of fossil rock facies. The mechanism of edge cracking in slab was summarized and analyzed by techniques such as continuous casting process control and secondary cooling optimization , Controlling the mass fraction of acid-soluble aluminum in the steel decreased from 0.045% to 0.025%, adopting the low-slag melting point low-viscosity suitable crystallization temperature mold powder to improve the slab straightening zone temperature greater than 900 ℃ and other measures to effectively improve the casting angle Department of heat, the better control of the corner of the slab cracks occur, so that the edge of the niobium transverse cracking has been effectively controlled.