高牌号3.28%Si钢冷轧板边裂机理分析和工艺改进

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英文篇名：Analysis on Mechanism of Edge Crack of High Grade 3.28%Si Steel Cold-Rolled Sheet and Process Improvement 作者：董亚军 ; 魏立群 ; 付斌 ; 陶彬之 英文作者：Dong Yajun;Wei Liqun;Fu Bin;Tao Binzhi;School of Materials Science and Engineering,Shanghai Application Technology Institute; 关键词：高牌号硅钢 ; 冷轧 ; 边裂 ; 解理断裂 ; 工艺措施 英文关键词：High Grade Silicon Steel;;Cold Rolling;;Edge Crack;;Cleavage Fracture;;Process Measures 中文刊名：TSGA 英文刊名：Special Steel 机构：上海应用技术大学材料科学与工程学院; 出版日期：2018-01-30 出版单位：特殊钢 年：2018 期：v.39;No.219 基金：上海市冶金工艺和设备检测专业技术服务平台资助(编号:11DZ2291200) 语种：中文; 页：TSGA201801005 页数：5 CN：01 ISSN：42-1243/TF 分类号：17-21

摘要

试验高牌号无取向硅钢(/%:0.006C,3.28Si,0.22Mn,0.030P,0.007S)的生产流程为180 t BOF-真空精炼-230 mm×(900~1 750)mm板坯连铸-热轧成2.02 mm板,冷轧成1.65 mm板。从热轧基板的边部组织、力学性能、剪边以及断口显微形貌和成分等方面分析了冷轧高牌号硅钢中边裂的成因和机理。结果表明,高牌号硅钢冷轧板边部裂纹为解理断裂,热轧板料边部的存在混晶组织而导致塑性下降、圆盘切边引发撕裂带的裂纹和小凹坑是引发冷轧边裂主要因素;另外,边部断口处S和Mn的偏析也是引起边裂裂纹的重要因素;通过热轧过程减小边部与中部温差,热轧后圆盘剪刀片侧间隙由410μm减少到280μm,连铸过程电磁搅拌参数从380 A/3 Hz改进为350 A/6 Hz等工艺措施,使高牌号无取向硅钢冷轧板边裂发生率由原来的14%下降至4%。
        The production flow sheet of tested high grade non-oriented silicon steel(/%:0. 006 C, 3. 28 Si, 0. 22 Mn,0. 030 P,0. 007 S) is 180 t BOF-vacuum refining-230 mm ×(900~1 750) mm slab casing-hot rolled to 2. 02 mm plate-cold rolled to 1. 65 mm sheet. The causes and mechanism of edge cracks of cold rolled high grade silicon steel sheet are analyzed by testing edge composition and structure, mechanical properties, micro morphology of cutting side and fracture of hot rolled base plate. Results show that the edge crack of cold rolled sheet of high grade silicon steel is cleavage fracture, the mixed grain structure existing in edge of hot rolled plate led to decreasing plasticity and round saw cutting to cause crack and small pits in cutting band are main reason to cause edge cracks in cold rolling process; besides the segregation of S and Mn at edge fracture is an important factor for the cracks initiation. With the measures including decreasing the temperature differential between edge and middle during hot rolling process, decreasing the side interval of round cutter to 280 μm from 410μm after hot rolling, and improving the electromagnetic stirring parameters from 380 A/3 Hz to 350 A/6 Hz, the occurring rate of edge cracks of high grade silicon steel cold sheet decreases from original 14% to 4%.

引文

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