Mechanism of drawing fracture of hard wire steel and optimization of continuous casting process
YANG Wen1, ZHANG Yan-hui1, ZHANG Li-feng2, JIANG Jin-dong3, WU Cong-ying4
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, China; 3. Department of Manufacturing Management, Shougang Shuicheng Iron and Steel (Group) Co., Ltd., Liupanshui 553028, Guizhou, China; 4. Department of Steelmaking and Rolling, Shougang Shuicheng Iron and Steel (Group) Co., Ltd., Liupanshui 553028, Guizhou, China
Abstract：Hard wire steel requires not only good mechanical properties,but also good processing properties. However,wire breakage often occurs in the drawing process of the wire rod of hard wire steel,which brings great harm to the continuity of processing. In order to reduce the wire breakage during the drawing of hard wire steel,the drawing fracture mechanism was studied,and the optimization of the corresponding continuous casting process was carried out. The drawing fractured wire sample of 82B hard wire steel was analyzed firstly. Through the analysis on the fractograph and longitudinal section of the fracture specimen,combined with the internal quality inspection of corresponding continuous casting billet,the influence mechanism of central defects and segregation of billet on drawing fracture of hard wire steel was obtained,which promoted the formation of cementite film in the center of wire rod and led to the generation and propagation of cracks. Then,by applying final electromagnetic stirring (F-EMS) at the solidification end of continuous casting with current of 350 A and frequency of 6.0 Hz,and reducing the superheat of molten steel to below 30 ℃,the central shrinkage and central segregation of 82B hard wire steel billet were reduced to 0.5 and 1.08, respectively,and the wire breaking rate of 82B hard wire steel was significantly reduced from 10-15 times per 100 tons before optimization to 4-5 times per 100 tons.
杨文, 张彦辉, 张立峰, 江金东, 伍从应. 硬线钢拉拔断裂机理及连铸工艺优化[J]. 钢铁, 2021, 56(9): 74-79.
YANG Wen, ZHANG Yan-hui, ZHANG Li-feng, JIANG Jin-dong, WU Cong-ying. Mechanism of drawing fracture of hard wire steel and optimization of continuous casting process[J]. Iron and Steel, 2021, 56(9): 74-79.
[1] 宋为,窦光聚,陈金晟,等. 世界线材及其制品的现状与展望[J]. 金属制品,2002,28(1):1. (SONG Wei,DOU Guang-ju,CHEN Jin-sheng,et al. Present situation and forecast of world wire rod and its products[J]. Steel Wire Products,2002,28(1):1.) [2] 孙中伟,陈海燕,张剑锋,等. 高强度大桥缆索用盘条生产现状分析[J]. 中国冶金,2019,29(1):66. (SUN Zhong-wei,CHEN Hai-yan,ZHANG Jian-feng,et al. Production status analysis of wire rod for high strength bridge cable[J]. China Metallurgy,2019,29(1):66.) [3] 孙文斌,黄贞益,林贵明,等. 硬线盘条拉拔断裂原因分析[J]. 物理测试,2005,23(6):44. (SUN Wen-bin,HUANG Zhen-yi,LIN Gui-ming,et al. Analysis of drawing brittle breaking for high carbon wire rod[J]. Physics Examination and Testing,2005,23(6):44.) [4] 颜银标,孙国元,陈光,等. 72A硬线钢拉拔横向断裂原因分析[J]. 钢铁,2004,39(2):57. (YAN Yin-biao,SUN Guo-yuan,CHEN Guang,et al. Research on causes of transverse rupture of 72A hard steel wire during drawing[J]. Iron and Steel,2004,39(2):57.) [5] 李娜. φ6.5 mm 60#硬线盘条尖杯状拉拔断裂原因分析[J]. 河北冶金,2015(8):57. (LI Na. Reason analysis for pointy-cup-like drawing break of 6.5 mm 60# hard wire bar[J]. Hebei Metallurgy,2015(8):57.) [6] 申文军. 硬线钢盘条拉拔断裂分析及工艺改进[J]. 连铸,2016,41(1):64. (SHEN Wen-jun. Drawing fracture analysis and technology improvement of hard steel wire rod[J]. Continuous Casting,2016,41(1):64.) [7] 申文军.硬线钢盘条拉拔断裂分析及工艺改进[J].连铸,2016 (1):64.(SHEN Wen-jun.Drawing fracture analysis and technology improvement of hard steel wire rod[J]. Continuous Casting, 2016 (1):64.) [8] 梁胜,周江,蒋世川. 硬线钢盘条质量分析与工艺优化[J]. 四川冶金,2016,38(3):45. (LIANG Sheng,ZHOU Jiang,JIANG Shi-chuan. Quality analysis and process optimization on hard wire rod[J]. Sichuan Metallurgy,2016,38(3):45.) [9] 张立峰. 关于钢洁净度指数的讨论[J]. 炼钢,2019,35(3):1. (ZHANG Li-feng. Discussion on the index of steel cleanliness[J]. Steelmaking,2019,35(3):1.) [10] ZHANG Li-feng,GUO Chang-bo,YANG Wen,et al. Deformability of oxide inclusions in tire cord steels[J]. Metallurgical and Materials Transactions B,2018,49(2):803. [11] 王向红,肖微,张正林,等. 异型中间包结构优化对帘线钢夹杂物的影响[J]. 中国冶金,2019,29(2):53. (WANG Xiang-hong,XIAO Wei,ZHANG Zheng-lin,et al. Influence of structure optimization of heterotype tundish on inclusion in wire cord steel[J]. China Metallurgy,2019,29(2):53.) [12] 李成斌,刘君,蒋鹏.车轴钢EA1N的缺陷分析[J].连铸, 2020(6): 57.(LI Cheng-bin, LIU Jun,JIANG Peng. Defect analysis of for axle steel EA1N[J].Continuous Casting,2020 (6):57.) [13] WANG Kun-peng,JIANG Min,WANG Xin-hua,et al. Behavior of dual-phase (MnO-SiO2-Al2O3)+(SiO2) inclusions in saw wire steels during hot rolling and cold drawing[J]. Metallurgical and Materials Transactions B,2020,51(1):95. [14] WANG Kun-peng,JIANG Min,WANG Xin-hua,et al. Formation mechanism of SiO2-type inclusions in Si-Mn-killed steel wires containing limited aluminum content[J]. Metallurgical and Materials Transactions B,2015,46(5):2198. [15] GUO Chang-bo,LING Hai-tao,ZHANG Li-feng,et al. Effect of slag basicity adjusting on inclusions in tire cord steels during ladle furnace refining process[J]. Metallurgical Research and Technology,2017,114(6):602. [16] HE Yue,XIANG Song,SHI Wei,et al. Effect of microstructure evolution on anisotropic fracture behaviors of cold drawing pearlitic steels[J]. Materials Science and Engineering:A,2017,683:153. [17] Hwang Joong-ki. Fracture behavior of twinning-induced plasticity steel during wire drawing[J]. Journal of Materials Research and Technology,2020,9(3):4527. [18] 杨文,牛凯军,季莎,等. 帘线钢脱氧过程中非金属夹杂物生成热力学[J]. 炼钢,2020,36(4):6. (YANG Wen,NIU Kai-jun,JI Sha,et al. Thermodynamics of the formation of non-metallic inclusions in the deoxidation process of tire cord steels[J]. Steelmaking,2020,36(4):6.) [19] 牛凯军,杨文,张立峰,等. 帘线钢凝固过程夹杂物生成热力学及工业实践[J]. 钢铁,2020,55(6):61. (NIU Kai-jun,YANG Wen,ZHANG Li-feng,et al. Thermodynamics and industrial practice of formation of inclusions during solidification of tire cord steels[J]. Iron and Steel,2020,55(6):61.) [20] 杨海峰,曲之国,李伟,等.轧制及热处理工艺对 API 5L Gr.B管线钢抗HIC性能的影响[J].连铸,2018(6):18.(YANG Hai-feng, QU Zhi-guo,LI Wei,et al. Effect of rolling and heat treatment on HIC resistance performance of APl 5L Gr.B pipeline steel[J]. Continuous Casting, 2018(6):18.) [21] 李西德,邓深,杨跃标,等. SWRH82B硬线钢CaO-Al2O3-SiO2系夹杂物塑性化控制的生产实践[J]. 中国冶金,2018,28(2):61. (LI Xi-de,DENG Shen,YANG Yue-biao,et al. Productive practice of plastic deformation control of CaO-Al2O3-SiO2 inclusions in SWRH82B hard wire steel[J]. China Metallurgy,2018,28(2):61.) [22] 胡志勇,陈兴华,唐萍,等.过热度对帘线钢连铸方坯碳偏析的影响[J].连铸,2017(5):12.(HU Zhi-yong, CHEN Xin-hua, TANG Ping,et al. Effect of superheat on carbr(segregation in continuous casting billet of cord steel[J]. Continuous Casting,2017 (5):12.) [23] 王林珠,席作冰,李长荣. 镁处理高碳硬线钢中夹杂物[J]. 钢铁,2021,56(7):56. (WANG Lin-zhu,XI Zuo-bing,LI Chang-rong. Inclusions in high-carbon hard wire steel treated by Mg[J]. Iron and Steel,2021,56(7):56.)
2021, Vol. 56 
