碳氮化物析出模型在Nb微合金船板钢连铸工艺中的应用

特殊钢 ›› 2011, Vol. 32 ›› Issue (3): 40-43.

碳氮化物析出模型在Nb微合金船板钢连铸工艺中的应用

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

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

收稿日期:2010-12-08 出版日期:2011-06-01 发布日期:2022-10-18
通讯作者: 张家泉，教授，北京科技大学钢铁冶金系，北京100083
作者简介:张小欢(1986-),女，硕士研究生，连铸工艺研究。

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

Zhang Xiaohuan¹, Liu Ke¹, Li Yang¹, Zhang Jiaquan¹, Liu Xuehua², Zhang Qiaoying² ，Zhang Jianping²

1 Key Lab of Ecologic and Recycle Metallurgy, Ministry Education and Dept of Iron and Steel Metallurgy, University of Science and Technology, Beijing 100083 ；
2 Ma' anshan Iron and Steel Co, Ma' anshan 243000

Received:2010-12-08 Published:2011-06-01 Online:2022-10-18

摘要/Abstract

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℃。

关键词: 含铌微合金钢, 碳氮化物, 析出, 连铸, 矫直温度, 热塑性

Abstract: 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 〜L45Mn, ≤0.020P, ≤0.010S, 0.015 - 0. 040Als, 0.015 〜0.025Nb), ≤0.009 0N) during concasting process, the model for precipitation of Nb ( C, N) and AIN in austenite has been established to analyze the effect of Nb (C, N) and AIN 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 niobium- bearing steel should be more than 950 ℃.

Key words: Niobium-Bearing Microalloying Steel, Carbo-nitride, Precipitation, Concasting, Strengthening Temperature, Hot Ductility

张小欢, 刘珂, 李阳, 张家泉, 刘学华, 张乔英, 张建平. 碳氮化物析出模型在Nb微合金船板钢连铸工艺中的应用[J]. 特殊钢, 2011, 32(3): 40-43.

Zhang Xiaohuan, Liu Ke, Li Yang, Zhang Jiaquan, Liu Xuehua, Zhang Qiaoying, Zhang Jianping. Application of Carbo-nitride Precipitation Model in Concasting Process of Nb-Bearing Microalloyed Steel for Ship Plate[J]. Special Steel, 2011, 32(3): 40-43.

参考文献

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