VOD+LF精炼的工艺流程304不锈钢夹杂物的演变
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摘要
对304不锈钢采用VOD+LF精炼工艺流程的夹杂物的变化进行研究,分别在其连铸连浇第2炉VOD炉冶炼开始前和结束后、LF炉弱搅拌工艺开始前和结束后、中间包浇铸中期、连铸坯进行取样,并利用化学成分分析、金相观察以及电镜能谱分析进行检测。研究发现304不锈钢生产过程T[O]随流程逐渐降低;夹杂物数量在LF弱搅拌前呈上升趋势,随后工艺流程中逐渐降低;而夹杂物形态在进行还原工艺前以Cr_2O_3、MnO的氧化物为主,还原工艺后以硅酸盐夹杂物为主;而LF精炼弱搅拌后,夹杂物变为以钙铝酸盐球形夹杂物为主。同时对夹杂物的产生机理进行了分析和研究。
The change of inclusions in the VOD + LF refining process of 304 stainless steel was studied. Before and after the beginning and end of the smelting process of the second VOD furnace with continuous casting and continuous casting, before and after the beginning and end of the weak agitation process of the LF furnace, mid-term tundish casting, the continuous casting billet is sampled, and the use of chemical composition analysis, metallographic observation and electron microscopy were used to detect it. It is found that the T[O] production process of 304 stainless steel gradually decreases with the process. The number of inclusions is on the rise before LF weak agitation. Then the process flow is gradually reduced. The morphology of inclusions is dominated by oxides of Cr203 and MnO before the reduction process is carried out.After the reduction process, the main silicate inclusions are found. After the weak agitation of LF refining, the inclusions changed into spherical inclusions with calcium aluminate as the main inclusions. At the same time, the formation mechanism of inclusions was analyzed and studied.
The change of inclusions in the VOD + LF refining process of 304 stainless steel was studied. Before and after the beginning and end of the smelting process of the second VOD furnace with continuous casting and continuous casting, before and after the beginning and end of the weak agitation process of the LF furnace, mid-term tundish casting, the continuous casting billet is sampled, and the use of chemical composition analysis, metallographic observation and electron microscopy were used to detect it. It is found that the T[O] production process of 304 stainless steel gradually decreases with the process. The number of inclusions is on the rise before LF weak agitation. Then the process flow is gradually reduced. The morphology of inclusions is dominated by oxides of Cr203 and MnO before the reduction process is carried out.After the reduction process, the main silicate inclusions are found. After the weak agitation of LF refining, the inclusions changed into spherical inclusions with calcium aluminate as the main inclusions. At the same time, the formation mechanism of inclusions was analyzed and studied.
引文
[1]张立峰,王新华.连铸钢中的夹杂物[J].山东冶金,2004,26(6):1-5.
[2]Hojo M,Nakao R amd Umezaki T,et al.Oxide Inclusion Control in Ladie and Tundish for Producing Clean Stainless Steel[J].ISIJ International.1996,36(S):S128-S131.
[3]Mizuno K,Todoroki H and Noda M,et al.Effects of Al and Ca in Ferrosilicon Alloys for Deoxidation on Inclusion Composition in Type304 Stainless Steel[J].Iron&Steelmaker,2001,28(8):93-101.
[4]Rinaldi M and Capotosti I.Influence of AOD Practice on the Inclusion Defect on Cold Rolled Strips[C].Proceedings of 85th Steelmaking.Conference.I&S Society.Nashville.March 10-13,2002:487-496.
[5]张雅丽,王建军,罗林根,等.304奥氏体不锈钢铸锭中非金属夹杂物的研究[J].安徽工业大学学报(自然科学版).2011,28(4):350-354.
[6]范光伟,王贵平,李志斌.0Crl8Ni9不锈钢中非金属夹杂物的来源[J].北京科技大学学报,2007,29(8):776-780.
[7]陈超,侯海滨,成光国,等.脱磷铁水-110tAOD-LF-CC-热轧流程304不锈钢中夹杂物的演变[J].特殊钢,2013,34(1):41-44.
[8]王贵平,李志斌,夏焱.304不锈钢连铸坯中的非金属夹杂物数量分布[J].材料与冶金学报,2009,8(3):161-164.
[9]Michelic S K,Wieser G and Bemhard C.On the Representativeness of Automated SEM/EDS Analyses for Inclusion Characerisation with Special Regard to the Measured Sample Area[J].ISIJ International,2011,51(5):769-775.
[2]Hojo M,Nakao R amd Umezaki T,et al.Oxide Inclusion Control in Ladie and Tundish for Producing Clean Stainless Steel[J].ISIJ International.1996,36(S):S128-S131.
[3]Mizuno K,Todoroki H and Noda M,et al.Effects of Al and Ca in Ferrosilicon Alloys for Deoxidation on Inclusion Composition in Type304 Stainless Steel[J].Iron&Steelmaker,2001,28(8):93-101.
[4]Rinaldi M and Capotosti I.Influence of AOD Practice on the Inclusion Defect on Cold Rolled Strips[C].Proceedings of 85th Steelmaking.Conference.I&S Society.Nashville.March 10-13,2002:487-496.
[5]张雅丽,王建军,罗林根,等.304奥氏体不锈钢铸锭中非金属夹杂物的研究[J].安徽工业大学学报(自然科学版).2011,28(4):350-354.
[6]范光伟,王贵平,李志斌.0Crl8Ni9不锈钢中非金属夹杂物的来源[J].北京科技大学学报,2007,29(8):776-780.
[7]陈超,侯海滨,成光国,等.脱磷铁水-110tAOD-LF-CC-热轧流程304不锈钢中夹杂物的演变[J].特殊钢,2013,34(1):41-44.
[8]王贵平,李志斌,夏焱.304不锈钢连铸坯中的非金属夹杂物数量分布[J].材料与冶金学报,2009,8(3):161-164.
[9]Michelic S K,Wieser G and Bemhard C.On the Representativeness of Automated SEM/EDS Analyses for Inclusion Characerisation with Special Regard to the Measured Sample Area[J].ISIJ International,2011,51(5):769-775.