高牌号3. 28 % Si钢冷轧板边裂机理分析和工艺改进

特殊钢 ›› 2018, Vol. 39 ›› Issue (1): 13-17.

高牌号3. 28 % Si钢冷轧板边裂机理分析和工艺改进

董亚军，魏立群，付斌，陶彬之

上海应用技术大学材料科学与工程学院，上海 201418

收稿日期:2018-08-07 出版日期:2018-02-01 发布日期:2022-06-28
作者简介:董亚军(1991-)，男，硕士研究生，2015年南京东南大学成贤学院(本科)毕业，硅钢轧制工艺和边裂机理研究。

Analysis on Mechanism of Edge Crack of High Grade 3.28% Si Steel Cold-Rolled Sheet and Process Improvement

Dong Yajun , Wei Liqun , Fu Bin ，Tao Binzhi

School of Materials Science and Engineering, Shanghai Application Technology Institute, Shanghai 201418

Received:2018-08-07 Published:2018-02-01 Online:2022-06-28
Supported by:

摘要/Abstract

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180t BOF-真空精炼-230mm×（900~1750mm）板坯连铸-热轧成2.02mm板,冷轧成1.65mm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%。

关键词: 高牌号硅钢 , 冷轧 , 边裂 , 解理断裂 , 工艺措施

Abstract: The production flow sheet of tested high grade non-oriented silicon steel (/% : 0.006C, 3.28Si, 0.22Mn, 0.030P, 0.007S) is 180t BOF-vacuum refining-230mm x(900~1750)mm slab casing-hot rolled to 2.02mm plate-cold rolled to 1.65mm 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 lo 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 410 μm 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%.

Key words: High Grade Silicon Steel, Cold Rolling, Edge Grack, Cleavage Fracture, Process Measures

董亚军, 魏立群, 付斌, 陶彬之. 高牌号3. 28 % Si钢冷轧板边裂机理分析和工艺改进[J]. 特殊钢, 2018, 39(1): 13-17.

Dong Yajun , Wei Liqun , Fu Bin , Tao Binzhi. Analysis on Mechanism of Edge Crack of High Grade 3.28% Si Steel Cold-Rolled Sheet and Process Improvement[J]. Special Steel, 2018, 39(1): 13-17.

参考文献

[1] 焦国华，吴光亮，孙彦辉，等.CSP热轧板卷边部裂纹成因及控制[J].钢铁，2006，41(6) ：499-503.
[2] Peng Q C,Tong Z B and Yang L,el al. The Study of Edge Crack on Hot Strip Steel for CSP[J]. Advanced Materials Research, 2012 , 581-582：533-539.
[3] 王小燕，李月兰，丰慧，等・CSP热轧薄板表面边裂成因初探[J].中国冶金，2005,15(11):48-51.
[4] 王健，田秀刚，房锦超，等.SPHC冷轧板带边裂原因分析[J]. 河北冶金，2011(10):4547.
[5] 安会龙，周建军，刘志利，等.超深冲钢切边质址的影响因素及改进措施[J].河北冶金，2013(2)：48-50.
[6] Daniel Yuen.Analysis of Microstructure Influence on Edge Crack Evolution of Thin Strip during Cold Rolling [J]. Metallurgical and Materials Transactions B,2011 ,42(6) ：1244-1252.
[7] Yue C, Wu S and Cao L,et al. Cause Summary and Case Analysis of Edge Crack Defects during the Cold Rolling Process of Thin Steel Sheet [J]. Forging & Stamping Technology,2014,39(11 ) ： 107-112.
[8] Lee S H, Lee K H and Lee S B. et al. Study of Edge-Cracking Characteristics during Thin-foil Rolling of Cu-Fe-P Strip[J]. International Journal of Precision Engineering and Manufacturing, 2013, 14(12)：2109-2118.
[9] 岳重祥，吴圣杰，曹垒，等.冷轧薄板边损边裂原因概述及实例分析[J].锻压技术,2014,39(11):107-112.
[10] 魏立群.金属成形原理[M].北京：冶金匸业出版，2008：26-30.
[11] 王守振，耿川.冷轧取向硅钢边裂分析与控制[J].科技视界,201650:110-110.
[12] Xie Haibo. The Research on the Edge Crack of Cold Rolled Thin Strip[ D]. Australia： School of Mechanical, Materials and Mechatronic Engineering,Faculty of Engineering 2011 :12-13.
[13] 安会龙，周建军,刘志利，等.超深冲钢切边质量的影响因素及改进措施[J].河北冶金,2013(2) ：48-50.
[14] 肖广耀，宋进英，田亚强，等.硫化物夹杂及成分偏析对610L钢冷弯开裂的影响[J].河北联合大学学报(自然科学版)，2012, 34(3)：71-74.
[15] 王祖滨，东涛.低合金高强度钢[M].北京：原子能岀版社, 1996：20-53.