QD08钢棒材粗轧心部质量影响分析及工艺优化  

Analysis of the impact of QD08 steel barroughrolling process on core quality and process optimization

作　　者：王萍 王天宇 王文虎 邓爱军 邢晓玉 丁海波 WANG Ping;WANG Tianyu;Wang Wenhu;DENG Aijun;XING Xiaoyu;DING Haibo(School of metallurgical engineering,Anhui University of Technology,Maanshan 243000,China;Zenith Steel Group Company Limited Sixth Rolling Plant,Changzhou 213011,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243000 [2]中天钢铁集团有限公司,江苏常州213011

出　　处：《重型机械》2024年第5期98-106,共9页Heavy Machinery

基　　金：安徽省科技重大专项(201903a05020051)。

摘　　要：本研究针对某钢铁公司在实际生产中遇到的QD08钢棒材心部疏松、孔隙和夹杂等质量问题,结合现场实际工艺参数,应用MSC.Marc有限元软件对QD08特殊钢钢棒材的粗轧过程进行了有限元模拟分析。深入探讨了粗轧过程中轧件的温度场和等效塑性应变分布,并进一步研究了轧件与轧辊之间的除磷时间、加热温度等因素对变形渗透以及心部质量的具体影响。通过对模拟结果的回归分析,发现在出炉温度为1120~1195℃、除磷时间为4~20 s,变形渗透和心部的等效塑性应变会随着上述参数的增加而提高,从而显著增加心部孔隙的焊合率。特别是在出炉温度为1195℃、除磷时间为12 s,与出炉温度为1120℃、除磷时间为4 s的条件相比,心表温差可增加至122.8℃,心部等效塑性应变量显著提升至2.29996,心部孔隙缺陷焊合率提高了26%。采用相似炉号的铸坯进行的现场轧制实验表明,采用现行原始工艺参数时,内伤率可达4%;但通过改进轧制工艺参数,如提升开轧温度39℃,可彻底消除内伤;继续在此基础上增加除磷时间2 s,亦可完全消除内伤。上述现场实验结果验证了模拟分析的准确性,为实际生产中控制产品内伤率提供了重要指导。This study addresses the quality issues encountered by a steel company in actual production,such as loose core,porosity,and inclusions in QD08 steel bars.By combining on-site actual process parameters,finite element simulation analysis was conducted on the rough rolling process of QD08 special steel bars using MSC.Marc finite element software.The temperature field and equivalent plastic strain distribution of the rolled piece during the rough rolling process were deeply explored,and further research was conducted on the specific effects of factors such as dephosphorization time and heating temperature between the rolled piece and the roll on deformation penetration and core quality.Through regression analysis of the simulation results,it was found that when the tapping temperature is between 1120~1195℃and the dephosphorization time is between 4~20 s,the deformation penetration and equivalent plastic strain of the core will increase with the increase of these parameters,thereby significantly increasing the welding rate of core porosity.Especially when the tapping temperature is 1195℃and the dephosphorization time is 12 s,compared to the conditions of tapping temperature at 1120℃and dephosphorization time at 4 s,the temperature difference between the core and surface can increase to 122.8℃,the equivalent plastic strain of the core significantly increases to 2.29996,and the welding rate of core porosity defects increases by 26%.Field rolling experiments using cast billets of similar heat numbers showed that when using the current original process parameters,the internal damage rate can reach 4%;however,by improving the rolling process parameters,such as increasing the starting rolling temperature by 39℃,internal damage can be completely eliminated;further increasing the dephosphorization time by 2 s on this basis can also completely eliminate internal damage.The above field experimental results verify the accuracy of the simulation analysis and provide important guidance for controlling the internal damage

关 键 词：QD08钢 心部缺陷 等效塑性应变 变形渗透 

分 类 号：TG335.6[金属学及工艺—金属压力加工]