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CSP工艺生产铌微合金化钢出现严重的混晶现象是我国目前已投产的几条CSP机组的普遍问题。通过对包钢CSP工艺生产的铌微合金钢的组织研究发现,铌提高钢的再结晶温度,如果在奥氏体部分再结晶温度区变形将导致原始奥氏体组织混晶,从而导致钢带的组织不均匀性。适当调节钢的铌含量和变形工艺条件,避免在奥氏体部分再结晶区域变形是解决钢带混晶问题的关键,目前在包钢已可生产铌含量小于0.030%的铌微合金钢。
CSP production of niobium microalloyed steel serious mixed crystal phenomenon is currently running several CSP units in China a common problem. The study on microstructure of niobium microalloyed steel produced by Baosteel CSP process shows that niobium increases the recrystallization temperature of steel and if the deformation occurs in the partial recrystallization temperature zone of austenite, it will result in the original austenite mixed crystal, Organizational heterogeneity. Proper adjustment of the niobium content and deformation process conditions of the steel to avoid deformation in the recrystallized region of austenite is the key to solve the problem of mixed steel ingot. At present, Baosteel has been able to produce niobium microalloyed steel with a niobium content of less than 0.030%.