氮含量控制对S450J0-T热轧H型钢表面裂纹的影响
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摘要
主要分析了钢中氮含量对钒微合金S450J0-T热轧H型钢铸坯裂纹指数以及轧后表面裂纹的影响。结果表明,S450J0-T钢轧后腹板裂纹是由连铸坯上细小裂纹引起,并在轧制中扩展形成;降低钢中氮的质量分数在0.008%以下,可以保证S450J0-T钢的表面质量;通过工艺优化,可以使钢中氮的质量分数控制在0.007 1%,S450J0-T钢铸坯表面裂纹明显减少,轧材裂纹修磨率降低约22%。
Effect of nitrogen content on the billet crack index and surface crack of V microalloyed S450J0-T hot-rolled H-shaped steel was studied. Results showed that web cracks of hotrolled S450J0-T steel were caused by fine cracks which formed during the continuous casting,then extended in rolling process. The surface quality of S450J0-T steel could be ensured by reducing the mass fraction of nitrogen to up to 0. 008% in the steel. The mass fraction of nitrogen in the steel could be controlled up to 0. 007 1% by the process optimization,which made the surface crack of S450J0-T steel slab obviously less,and the rolling crack rate reduced by about 22%.
Effect of nitrogen content on the billet crack index and surface crack of V microalloyed S450J0-T hot-rolled H-shaped steel was studied. Results showed that web cracks of hotrolled S450J0-T steel were caused by fine cracks which formed during the continuous casting,then extended in rolling process. The surface quality of S450J0-T steel could be ensured by reducing the mass fraction of nitrogen to up to 0. 008% in the steel. The mass fraction of nitrogen in the steel could be controlled up to 0. 007 1% by the process optimization,which made the surface crack of S450J0-T steel slab obviously less,and the rolling crack rate reduced by about 22%.
引文
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[2]刘圣.淬火及回火工艺对S450J0高强度H型钢组织和性能的影响[J].河南冶金,2014,22(1):30-33.
[3]袁龙兵.S450J0H型钢的工艺优化[J].安徽冶金科技职业学院学报,2011,21(2):1-3.
[4]程鼎.微合金化技术在55CH型钢中的应用[J].轧钢,2008,25(3):31-33.
[5]MINTZ B,ABUSHOSHA R.Influence of vanadium on hot ductility of steel[J].Ironmaking and Steelmaking,1993,20:445-452.
[6]CHEN B H,YU H.Hot ductility behavior of V-N and V-Nb microalloyed steels[J].International Journal of Minerals,Metallurgy and Materials,2012,19(6):525-529.
[7]苏小利,刘文飞.260 t复吹转炉底吹模式及钢水增氮的研究[J].炼钢,2011,27(6):31-33.
[8]言若璞,钱丹丹,陈志月,等.提高LF炉精炼效率的途径[J].世界有色金属,2016(7):82-83.
[9]张胜生,杨君胜,周怀斌,等.连铸中间包定径水口快速更换保护浇注技术[J].山东冶金,2001,24(2):67-69.