72A帘线钢线材冷拔笔尖状断裂分析和改进工艺措施

特殊钢 ›› 2009, Vol. 30 ›› Issue (5): 55-57.

72A帘线钢线材冷拔笔尖状断裂分析和改进工艺措施

孟宪成¹，王勇²，刘雅政¹

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；

收稿日期:2009-04-20 出版日期:2009-10-01 发布日期:2022-11-18
作者简介:孟宪成(1966-)，男，博土研究生，高级工程师，1988年北京科技大学毕业，钢铁材料组织性能控制研究。

Analysis on Pencil-Tip Shaped Fracture of Cord Steel 72A during Cold Drawing and Improvement of Process

Meng Xiancheng¹ , Wang Yong² , Liu Yazheng¹

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；

Received:2009-04-20 Published:2009-10-01 Online:2022-11-18

摘要/Abstract

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。

关键词: 帘线钢72A, 直拉工艺, 笔尖状断裂

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.

Key words: Cord Steel, 72A,Direct Drawing Process, Pencil-Tip Shaped Fracture

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.

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.

[1]	张朝磊, 刘雅政, 周乐育, 唐山. 热轧材冷拉过程65钢硬线断裂分析[J]. 特殊钢, 2012, 33(1): 57-69.
[2]	谢文新, 许晓红. 末端电磁搅拌参数对帘线钢72A铸坯中心碳偏析的影响[J]. 特殊钢, 2010, 31(1): 28-29.