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针对新钢热连轧无取向硅钢冷轧基料XG1300WR、XG1000WR、XG800WR带钢边部"翘皮"缺陷,根据其形成机理,对影响无取向硅钢带钢边部"翘皮"缺陷的主要影响因素进行了分析。结果表明,在一定钢种成分与加热轧制工艺下,粗轧过程边部的组织形态和侧压量对带钢边部"翘皮"缺陷的发生率有较大影响。为了有效控制带钢边部"翘皮"缺陷,在钢的成分控制,加热与轧制工艺,立辊孔型以及影响粗轧板坯边部温降等方面提出了可行的改进措施。 相似文献
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硅钢片因其使用特点对热轧板形控制提出了较高的要求,近年来,采用边部加热器提高中间坯边部温度是热轧硅钢生产的新工艺,边部加热器的投入,能够降低板坯的断面温差,提高板坯温度的均匀性,对提高边部质量有显著作用。但是,提高边部温度会对部分板形指标(如边降等)产生一些负面影响,造成下游工序板形质量的恶化。针对使用边部加热器的上述特点,研究了边部加热器的工作原理及设备功能,重点分析了热轧硅钢生产中边部加热器控制逻辑及工艺参数,结合生产中硅钢的凸度指标、边降指标及裂边、翘皮等缺陷,通过设计典型工况试验,对边部加热器的控制逻辑及工艺参数进行了优化,确定了相对最优的工艺参数,并应用于生产实践,保证了硅钢产品的边部质量及板形指标,提高了产品的成材率。 相似文献
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川崎取向硅钢存在热轧板边裂问题。针对此问题,日本川崎公司采取了板坯在1200℃以上加热时控制保护气氛中氧的质量分数及保持时间;调整粗轧压下率及轧制温度;实施宽压下及边部加热;变化材料的变形能,抑制边部鱼鳞状缺陷的发生等一系列措施,取得了缓解热轧板边裂的明显效果。 相似文献
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通过对中厚板边裂成因的研究,认为钢水精炼后N元素含量增加导致钢水浇铸过程氮化物沿晶界析出,导致700~900℃铸坯脆性增加是引起中厚板边部裂纹缺陷的主要因素,提出采用铸机边部遮蔽技术提高板坯角部在拉矫过程中的表面温度,从而解决中厚板边裂问题。 相似文献
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《Baosteel Technical Research》2015,9(3):23-28
In this study,a 600 MPa hot-rolled corrosion-resistant steel plate produced by a specific company is investigated. Edge jagged defects and edge surface defects generated on both sides of the strip during production are characterized and analyzed. The results indicate that the distribution of reoxidation granules is located underneath the surface peel and that copper-containing granules diffuse along austenite grain boundaries. This phenomenon combined with the chemical composition and production parameters of a strip indicate that copper brittleness leads to edge jagged defects. However,the surface defects should be attributed to inherent defects on the surface of the strip. Measures that prevent surface oxidation and copper segregation at grain boundaries would likely eliminate these two types of edge defects. 相似文献
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利用x-射线衍射技术研究了Fe-3%Si取向电工钢中的铌含量-点阵畸变-织构三者之间的关系。结果表明,在一定的范围内,随着铌含量的增加,再结晶退火前的钢板内高斯晶粒的点阵畸变增加,再结晶退火后的高斯织构也相应增加,抑制剂是通过影响形变基体的微观应变而影响取向电工钢的再结晶织构的。 相似文献
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Microstructure evolution, dynamic recrystallization, high temperature oxidation and hot ductility of 1.4 % Si non-oriented electrical steel sheets were investigated to reduce edge cracking. The causes of cracking were found to be coarse as-cast microstructure, grain boundary oxidation in reheating furnace, lack of dynamic recrystallization during hot rolling and increase of temperature, resulting in reduced hot ductility in strip edge region. Countermeas- ures against the edge crack are proposed accordingly. Lowering reheating temperature and reducing holding time re- duced oxidation and decarburization. Hot charging temperature was increased to decrease reheating temperature. And using an edger can refine microstructure in strip edge region. Finally, edge heater can be added to increase edge re- gion formability by inducing dynamic reerystallization and ductility by increasing temperature. 相似文献
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冷轧取向硅钢片中的抑制相系 总被引:1,自引:0,他引:1
综合论述了取向硅钢片中抑制相系阻碍初次正常晶粒生长,促进二次再结晶取向晶粒长大的机制,3种类型抑制相在硅钢中的特征、作用和形成条件。 相似文献