SPHD钢中夹杂物在RH-CC工序的演变规律
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摘要
以SPHD钢在BOF-RH-CC工艺生产过程中夹杂物的演变为研究对象,分析了从精炼出站到连铸过程钢中T. O、[N]的变化情况,研究了夹杂物数量、尺寸分布以及成分演变规律.结果表明:从RH精炼出站到中间包,钢中T. O和[N]含量增加,单位面积夹杂物数量升高,钢水因二次氧化产生了Al_2O_3夹杂.夹杂物尺寸变化主要集中在10μm以下的夹杂物,其中小于5μm夹杂物所占比例降低,5～10μm夹杂物所占比例增多,钢包与中间包之间的保护浇铸需要加强.部分Al_2O_3夹杂可转变为低熔点且易被去除的CaO-MgO-Al_2O_3系或CaO-MgO-Al_2O_3-SiO_2系等复合夹杂,铸坯内夹杂物主要以Al_2O_3,Al_2O_3-SiO_2,CaO-SiO_2以及CaO-Al_2O_3-SiO_2等形式存在,也有附着少量MnS的Al_2O_3夹杂.
Variation of T. O and [N]content in steel during the end of RH refining and continuous casting was investigated and the amount,size and composition evolution of the inclusions in smelting processes were studied based on the production practice of SPHD steel by BOF-RH-CC process. The results showed that from RH refining station to the tundish,the content of T. O and [N]in the steel and the amount of the inclusions per unit area increases. Inclusion of Al_2 O_3 forms due to secondary oxidation of the molten steel during this process. Size of the inclusions is mainly less than 10 μm,proportion of the inclusions less than 5 μm gradually decreases and the inclusions in the range of 5 ～ 10 μm gradually increases. The protective casting between the ladle and the tundish should be strengthened. The inclusion changes from Al_2 O_3 to CaO-MgO-Al_2 O_3 ternary or CaO-MgO-Al_2 O_3-SiO_2 quaternary system with low melting point,while the inclusions in the slab are mainly Al_2 O_3,Al_2 O_3-SiO_2,CaO-SiO_2,CaO-Al_2 O_3-SiO_2 and Al_2 O_3 inclusions with small amount of MnS.
Variation of T. O and [N]content in steel during the end of RH refining and continuous casting was investigated and the amount,size and composition evolution of the inclusions in smelting processes were studied based on the production practice of SPHD steel by BOF-RH-CC process. The results showed that from RH refining station to the tundish,the content of T. O and [N]in the steel and the amount of the inclusions per unit area increases. Inclusion of Al_2 O_3 forms due to secondary oxidation of the molten steel during this process. Size of the inclusions is mainly less than 10 μm,proportion of the inclusions less than 5 μm gradually decreases and the inclusions in the range of 5 ～ 10 μm gradually increases. The protective casting between the ladle and the tundish should be strengthened. The inclusion changes from Al_2 O_3 to CaO-MgO-Al_2 O_3 ternary or CaO-MgO-Al_2 O_3-SiO_2 quaternary system with low melting point,while the inclusions in the slab are mainly Al_2 O_3,Al_2 O_3-SiO_2,CaO-SiO_2,CaO-Al_2 O_3-SiO_2 and Al_2 O_3 inclusions with small amount of MnS.
引文
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[4]徐志荣,杨文,曹晶,等.低碳铝镇静钢LF精炼过程钢中非金属夹杂物的研究[J].钢铁,2010,45(10):33-36.(Xu Zhirong,Yang Wen,Cao Jing,et al.Investigation on nonmetallic inclusions of LC AK steel in LF secondary refining[J].Iron and Steel,2010,45(10):33-36.)
[5]肖聪.SPHE钢CSP连铸坯非金属夹杂物的研究[D].武汉:武汉科技大学,2011.(Xiao Cong.Study on inclusions of the CSP continuous casting slab of SPHE steel[D].W uhan:W uhan U niversity of Science and T echnology,2011.)
[6]贾雅楠.高品质镀锡基板夹杂物行为基础研究[D].北京:北京科技大学,2017.(Jia Yanan.Studies on behaviors of inclusions in high quality tin plate[D].Beijing:U niversity of Science and T echnology Beijing,2017.)
[7]段大波.SPHD钢生产过程中夹杂物演变规律研究[C]//2016年全国炼钢学术会议大会报告及论文摘要集.长沙:中国金属学会,2016:148.(Duan Dabo.Study on the evolution of inclusions in the production process of SPHD steel[C]//2016 national steelmaking conference conference report and abstracts.C hangsha:T he C hinese Society for M etals,2016:148.)
[8]王德永,吕铭,刘承军,等.RH精炼过程钢中非金属夹杂物行为及演变规律[J].东北大学学报(自然科学版),2013,34(03):373-377.(Wang Deyong,Lv Ming,Liu Chengjun,et al.The evolution and behavior of the non-metallic inclusions during the R H refining process[J].Journal of N ortheastern U niversity(N atural Science),2013,34(03):373-377.)
[9]张正群.300t RH加铝后循环时间对IF钢中脱氧夹杂行为的影响[J].特殊钢,2018,39(01):48-50.(Zhang Zhengqun.Effect of 300t RH circulation time after adding aluminum on behavior of deoxidation inclusions in IFsteel[J].Special Steel,2018,39(01):48-50.)
[10]薛正良,李正邦,张家雯.钢的纯净度的评价方法[J].钢铁研究学报,2003,15(1):62-66.(Xue Zhengliang,Li Zhengbang,Zhang Jiawen.Evaluation method for steel cleanliness[J].Journal of Iron and Steel R esearch,2003,15(1):62-66.)
[11]郑宏光,陈伟庆,李景捷.321不锈钢中大型夹杂物的研究[J].炼钢,2005,21(4):24-27.(Zheng Hongguang,Chen Weiqing,Li Jingjie.Study on the large inclusions in 321 stainless steel[J].Steelmaking,2005,21(4):24-27.)