碳氮化物析出模型在Nb微合金船板钢连铸工艺中的应用  

Application of Carbo-nitride Precipitation Model in Concasting Process of Nb-Bearing Microalloyed Steel for Ship Plate

作　　者：张小欢[1] 刘珂[1] 李阳[1] 张家泉[1] 刘学华[2] 张乔英[2] 张建平[2] 

机构地区：[1]北京科技大学钢铁冶金系与循环冶金教育部重点实验室,北京100083 [2]马鞍山钢铁股份有限公司,马鞍山243000

出　　处：《特殊钢》2011年第3期40-43,共4页Special Steel

摘　　要：针对含铌微合金钢(D36船板钢,%:0.12～0.16C、0.25～0.45Si、1.25～1.45Mn、≤0.020P、≤0.010S、0.015～0.040Als、0.015～0.025Nb、≤0.009 0N)连铸过程裂纹敏感性大的问题,建立了Nb(C,N)和A1N在奥氏体中的析出模型,以分析板坯在850～1150℃矫直时Nb(C,N)和AlN析出对铸坯热塑性的影响。结果表明,含铌微合金钢中碳氮化物的析出方式主要是晶界和位错线形核,在950℃时Nb(C,N)的综合析出速度和AlN在晶界上的析出速度最大。因此,含铌微合金钢的矫直温度应大于950℃。According the trouble of large sensitivity on crack for niobium-bearing microalloying steel （ship plate steel D36, % ：0.12-0.16C、0.25～0.45Si、1.25～1.45Mn、≤0.020P、≤0.010S、0.015-0.040Ms、0.015-0.025Nb、≤0.0090N） during concasting process, the model for precipitation of Nb （C, N） and A1N in austenite has been established to analyze the effect of Nb （ C, N） and A1N precipitates on hot ductility of casting slab during slab straightening at 850 - 1 150 ℃. Results show that the main precipitating model of carbo-nitrides in niobium-bearing microalloying steel mainly is nucleating at grain boundary and dislocation line, and at 950 ~C the comprehensive precipitating speed of Nb （ C, N） and the precipitating speed of AIN at grain boundary are maximum, therefore strengthening temperature of niobiumbearing steel should be more than 950 ℃

关 键 词：含铌微合金钢 碳氮化物 析出 连铸 矫直温度 热塑性 

分 类 号：TF777[冶金工程—钢铁冶金]