化学成分对薄规格酸洗板表面质量的影响
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摘要
针对薄规格酸洗板频发的表面麻点问题,从钢种自身氧化特性角度出发,通过不同成分的配比,跟踪实际生产热卷的表面状态,探讨化学成分对表面质量的影响。利用热重模拟、扫描电镜分析和现场跟踪发现,原钢种不具有明显的抗氧化特性,热轧过程中铁皮整体较厚;当钢中添加Si-Cr元素后,钢种抗氧化性明显提高,在1 100℃左右在界面可形成厚度为16μm的致密氧化膜,有效降低了精轧入口处的铁皮厚度,但由于致密氧化膜的存在,热轧除鳞效果有所降低,易于形成条带状铁皮形貌;当钢中复合添加Si-Cr-P元素后,P元素的存在可显著改善致密氧化膜的除鳞特性,表面质量明显提高。
In view of the frequent surface pitting problem of thin hot rolled pickled sheet,the surface quality of the actual production was traced through the ratio of different components,and the influence of chemical composition on the surface quality was discussed.Using the thermogravimetric simulation,scanning electron microscope analysis and actual tracking,it is found that the original steel does not have obvious antioxidant properties,and the scale is thicker during hot rolling.When Si-Cr element is added to the steel,the oxidation resistance of steel is obviously improved,and the interface can form a 16μm thickness interface dense oxide layer at 1 100℃ before inlet temperature of finishing rolling.The oxide film can effectively reduce the thickness of the scale at the entrance of the finishing rolling,but due to the presence of the dense oxide layer,the effect of the hot rolled descaling is reduced,and the shape of the strip scale is easily formed.When the Si-Cr-P element is added to the steel,the presence of the P element can significantly improve the descaling characteristics of the steel,and the surface quality is obviously improved.
In view of the frequent surface pitting problem of thin hot rolled pickled sheet,the surface quality of the actual production was traced through the ratio of different components,and the influence of chemical composition on the surface quality was discussed.Using the thermogravimetric simulation,scanning electron microscope analysis and actual tracking,it is found that the original steel does not have obvious antioxidant properties,and the scale is thicker during hot rolling.When Si-Cr element is added to the steel,the oxidation resistance of steel is obviously improved,and the interface can form a 16μm thickness interface dense oxide layer at 1 100℃ before inlet temperature of finishing rolling.The oxide film can effectively reduce the thickness of the scale at the entrance of the finishing rolling,but due to the presence of the dense oxide layer,the effect of the hot rolled descaling is reduced,and the shape of the strip scale is easily formed.When the Si-Cr-P element is added to the steel,the presence of the P element can significantly improve the descaling characteristics of the steel,and the surface quality is obviously improved.
引文
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[19] El-Kashif E,Asakura K,Shibata K.Effect of cooling rate after recrystallization on P and B segregation along grain boundary in IF steels[J].ISIJ International,2003,43(12):2007.
[20]赵庆贺,刘俊友,刘杰.Cr13Si5铁素体耐热钢1 100℃下高温抗氧化性能研究[J].铸造技术,2011,32(2):179.(Zhao Q H,Liu J Y,Liu J.Cr13Si5ferritic heat-resistant steel[J].Casting Technology,2011,32(2):179.)
[21]李学通,杜凤山,张健民.带高压水除鳞换热的带钢粗轧过程温度场数值模拟[J].钢铁研究学报,2005,17(3):39.(Li X T,Du F S,Zhang J M.Numerical simulation of temperature field in hot strip rough rolling with descaling by high pressure water[J].Journal of Iron and Steel Research,2005,17(3):39.)
[2]刘清友,侯豁然.微合金钢超细组织的控制轧制[J].钢铁研究学报,2000,12(6):29.(Liu Q Y,Hou H R.Control rolling of ultra-fine microstructure of microalloy steel[J].Journal of Iron and Steel Research,2000,12(6):29.)
[3]陈红桔,刘清友,韩力,等.控轧控冷工艺对铌钛微合金钢组织和性能的影响[J].钢铁研究学报,1999,11(3):38.(Chen H J,Liu Q Y,Han L,et al.Effect of controlled rolling and controlled cooling on microstructure and properties of niobium titanium microalloy steel[J].Journal of Iron and Steel Research,1999,11(3):38.)
[4]苏清旭.热带表面缺陷与轧辊表面状态的关系[J].轧钢,2000,12(1):29.(Su Q X.The relationship between the surface defects of the tropical surface and the roll surface state[J].Steel Rolling,2000,12(1):29.)
[5]孙彬,刘振宇,邱以清,等.低碳钢表面FeO层空气条件下等温转变行为的研究[J].钢铁研究学报,2010,22(2):34.(Sun B,Liu Z Y,Qiu Y Q,et al.Study on isothermal transformation behavior under FeO layer air conditions on lowcarbon steel surfaces[J].Journal of Iron and Steel Research,2010,22(2):34.)
[6] Okabayashi A,Morikawa H,Tsujimoto Y.Development and characteristics of high speed steel rolls by centrifugal casting[C]//SEAISI 1997Korea Conference on“Flat Product Technology”Proceedings.Korea:South East Asia Iron and Steel Institute,1997:21.
[7] Molinari A,Straffelini G,Tomasi A,et al.Oxidation behaviour of ledeburitic steels for hot rolls[J].Materials Science and Engineering,2000,280A(2):255.
[8] Vergne C,Boher C,Gras R,et al.Influence of oxides on friction in hot rolling experimental investigations and tribological modelling[J].Wear,2006,260:957.
[9] Zhu Q,Zhu H T,Tieu A K,et al.Three dimensional microstructure study of oxide scale formed on a high-speed steel by means of SEM,FIB and TEM[J].Corrosion Science,2001,53(11):3603.
[10] Pellizzari M,Cescato D,DeFlora M D.Hot friction and wear behaviour of high speed steel and high chromium iron for rolls[J].Wear,2009,267:467.
[11]孙大乐,范群,姚利松.奥氏体化保温时间对高速钢工作辊组织和耐磨性的影响[J].金属热处理,2006,30(12):9.(Sun D L,Fan Q,Yao L S.Effect of austenizing time on the microstructure and wear resistance of the HSS work-roll[J].Heat Treatment of Metals,2006,30(12):9.)
[12] Okada H,Fukagawa T,Ishihara H,et al.Prevention of redscale formation during hot rolling of steels[J].ISIJ International,1995,35(7):886.
[13] Tomoki F.Mechanism of red scale defect formation in Siadded hot rolled steel sheets[J].ISIJ International,1994,34(11):906.
[14]陈文云,王树奇,魏敏先,等.3Cr13钢高温抗氧化性能的研究[J].铸造,2012,61(3):296.(Chen W Y,Wang S Q,Wei M X,et al.Study on high temperature oxidation resistance of 3Cr13steel[J].Casting,2012,61(3):296.)
[15]刘兴博,董建新,谢锡善.杂质元素磷、硫在特殊钢中的作用[J].特殊钢,1998,19(3):1.(Liu X B,Dong J X,Xie X S.The role of impurity elements P and S in special steel[J].Special Steel,1998,19(3):1.)
[16]付贵勤,朱苗勇.磷元素在钢中的晶界偏聚[J].鞍钢技术,2006(3):5.(Fu G Q,Zhu M Y.Grain boundary segregation of phosphorus in steel[J].Anshan Steel Technology,2006(3):5.)
[17] Kizu T,Nagataki Y,Inazumi T,et al.Effects of chemical composition and oxidation temperature on the adhesion of scale in plain carbon steels[J].ISIJ International,2001,41(12):1494.
[18] Zhan M C,Kun P W,Zhi Y Q,et al.Thermodynamic reoptimization of the Fe-P system[J].Acta Physico-Chimica Sinica,2012,28(1):37.
[19] El-Kashif E,Asakura K,Shibata K.Effect of cooling rate after recrystallization on P and B segregation along grain boundary in IF steels[J].ISIJ International,2003,43(12):2007.
[20]赵庆贺,刘俊友,刘杰.Cr13Si5铁素体耐热钢1 100℃下高温抗氧化性能研究[J].铸造技术,2011,32(2):179.(Zhao Q H,Liu J Y,Liu J.Cr13Si5ferritic heat-resistant steel[J].Casting Technology,2011,32(2):179.)
[21]李学通,杜凤山,张健民.带高压水除鳞换热的带钢粗轧过程温度场数值模拟[J].钢铁研究学报,2005,17(3):39.(Li X T,Du F S,Zhang J M.Numerical simulation of temperature field in hot strip rough rolling with descaling by high pressure water[J].Journal of Iron and Steel Research,2005,17(3):39.)