| 72A帘线钢线材冷拔笔尖状断裂分析和改进工艺措施 |
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| 引用本文： | 孟宪成,王勇,刘雅政.72A帘线钢线材冷拔笔尖状断裂分析和改进工艺措施[J].特殊钢,2009,30(5):55-57. |
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| 作者姓名： | 孟宪成 王勇 刘雅政 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院，北京 100083;
2. 邢台钢铁有限责任公司技术中心，邢台 054027； |
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| 摘 要： | 72A帘线钢线材拉丝笔尖状断裂的推动力,为拉拔时的不均匀变形。心部粗大的先共析铁素体和粗片状渗碳体易形成粗拉时的裂纹源;中心偏析产生的裂纹多出现在中拉工序。控制连铸坯中心碳偏析指数≤1.1,采用相变前≥15℃/s快冷,相变区600～620℃近似等温的控冷策略,获得先共析铁素体含量≤0.8%,索氏体率达90%的均匀组织,基本杜绝了72A线材直拉时笔尖断裂的产生。
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| 关 键 词： | 帘线钢72A 直拉工艺 笔尖状断裂 |
| 收稿时间： | 2009-04-20 |
Analysis on Pencil-Tip Shaped Fracture of Cord Steel 72A during Cold Drawing and Improvement of Process |
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| Meng Xiancheng,Wang Yong,Liu Yazheng.Analysis on Pencil-Tip Shaped Fracture of Cord Steel 72A during Cold Drawing and Improvement of Process[J].Special Steel,2009,30(5):55-57. |
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| Authors: | Meng Xiancheng Wang Yong Liu Yazheng |
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| Affiliation: | 1. School of Matenial Science and Engineering,University of Science and Technology,Beijing 100083;
2. Technology Service and Development Centre,Xingtai lron and Steel Co Ltd,Xingtai 054027； |
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| Abstract: | Un-homogeneity of deformation is the driving force on pencil-tip shaped fracture of cord steel 72A during cold drawing. The coarse proeutectoid ferrite and thicker cementite lamella at center of wire are source of crack during rough drawing; and the crack produced by center segregation often occurs during middle-drawing.With controlling center carbon segregation index of cast billet ≤ 1.1 , using ≥ 15℃/s quick cooling process before phase transformation,control- ling cooling at phase transformation zone 600～620 ℃ similar isothermal transformation to obtain proeutectoid ferrite content ≤0.8%,uniform sorbite structure being up to 90%,the pencil-tip shaped fracture of 72A steel wire during straight-line drawing is basically avoided. |
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| Keywords: | 72A |
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