12Cr1MoV钢轧材表面裂纹控制技术的研究与应用
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摘要
针对12Cr1MoV钢在生产过程中出现不同程度的表面裂纹,采用金相显微镜以及扫描电镜检测确认,轧材裂纹是由铸坯裂纹导致。对裂纹的形成原因进行了分析,得出钢水洁净度,钢水氮含量以及结晶器保护渣是导致铸坯裂纹的主要原因,通过控制电弧炉终点碳、优化精炼渣系以及钙化处理脱氧产物提升钢水洁净度,控制圆坯表面氮化物析出,保证钢中N含量<0.007%,同时使用管坯钢保护渣,使得12Cr1MoV钢表面裂纹缺陷率由1.6%下降到0.3%。
For the diffecrent degress surface crack occur in the prodution of steel 12 Cr1 MoV,it was confirmed by metallographic microscope and scanning electron microscope that cracks in the rolled material were caused by cracks in the cast billet. Based on the analysis of the causes of the cracks,it is concluded that the cleanliness of molten steel,the nitrogen content of molten steel and the steel shielding slag in mould are the main reasons for the cracks. Improve the cleanliness of molten steel by controlling the terminal carbon of the electric furnace, optimizing the refining slag system and treating the deoxygenation products with calcification, controlling the nitride precipitation on the surface of the billet, ensuring the N content of steel < 0.007%,and using pipe billet steel shielding slag,the surface crack defect rate of 12 Cr1 MoV steel decreased from1. 6% to 0.3%.
For the diffecrent degress surface crack occur in the prodution of steel 12 Cr1 MoV,it was confirmed by metallographic microscope and scanning electron microscope that cracks in the rolled material were caused by cracks in the cast billet. Based on the analysis of the causes of the cracks,it is concluded that the cleanliness of molten steel,the nitrogen content of molten steel and the steel shielding slag in mould are the main reasons for the cracks. Improve the cleanliness of molten steel by controlling the terminal carbon of the electric furnace, optimizing the refining slag system and treating the deoxygenation products with calcification, controlling the nitride precipitation on the surface of the billet, ensuring the N content of steel < 0.007%,and using pipe billet steel shielding slag,the surface crack defect rate of 12 Cr1 MoV steel decreased from1. 6% to 0.3%.
引文
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[2]荆德君,刘中柱,蔡开科.包晶相变对连铸坯初生坯壳凝固收缩的影响[J].钢铁研究学报,1999, 11(3):9-13.
[3]梁志刚,王楠,赵亮,等.超宽板坯包晶钢连铸初生坯壳应力的数值模拟[J].材料与冶金学报,2011, 10(3):20-23.
[4]黄希祜.钢铁冶金原理[M].北京:冶金工业出版社,2013:497-505.
[5]周国元,彭自胜.45 t电炉终点碳控制技术研究与应用[J].北京科技大学学报,2012, 34(1):51-55.
[6]吴健鹏,王金平,王春锋,等.低碳铝镇静钢LF精炼工艺优化[J].武钢技术,2011,49(6):25-28.
[7]朱正海,肖丽俊,彭世恒,等.连铸过程铌钛微合金钢中第二相复合析出模型[J].钢铁研究学报,2014, 26(7):18-22.
[8]曹磊.包晶钢连铸坯表面纵裂与保护渣性能选择[J].钢铁,2015, 50(2):38-42.