An Analysis on Fracture of Hard Wire of Steel 65 C during Hot Rolled Coil Cold Drawing Process

张朝磊; 刘雅政; 周乐育; 唐山

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An Analysis on Fracture of Hard Wire of Steel 65 C during Hot Rolled Coil Cold Drawing Process

更新时间：2026-01-21

- An Analysis on Fracture of Hard Wire of Steel 65 C during Hot Rolled Coil Cold Drawing Process
- Special Steel Vol. 33, Issue 1, Pages: 57-69(2012)
- 作者机构：
  
  1. 北京科技大学材料科学与工程学院,北京,100083
  2. 山东三山集团，阳谷,252300
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：11 July 2011，
  
  Online First：20 September 2022，
  
  Published：20 September 2012
- 稿件说明：
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张朝磊, 刘雅政, 周乐育, et al. An Analysis on Fracture of Hard Wire of Steel 65 C during Hot Rolled Coil Cold Drawing Process[J]. Special Steel, 2012, 33(1): 57-69.
DOI：

张朝磊, 刘雅政, 周乐育, et al. An Analysis on Fracture of Hard Wire of Steel 65 C during Hot Rolled Coil Cold Drawing Process[J]. Special Steel, 2012, 33(1): 57-69. DOI：

摘要

65钢(/%:0.62～0.。70C、0.18～0.28Si、0.55～O.75Mn)硬线盘条的生产流程为120 t转炉-LF-170mm×170 mm连铸-高速线材轧制。采用光学和扫描电子显微镜分析了65钢∅6.5 mm热轧盘条在冷拉至∅1.85mm过程中断裂的原因。实验结果表明

断口宏观特征为笔尖状

盘条横截面组织均匀性较差;裂纹起源于心部粗大的先共析铁素体和粗片状渗碳体

断裂的主要原因是索氏体化率低

存在大块先共析铁素体和中心碳偏析。

Abstract

The production process flow sheet for hard wire coil of steel 65C (/% : 0. 62 〜0. 70C

0. 18 ~ 0. 28Si

0. 55 ~0. 75Mn) is 120 t converter-LF-170 mm x 170 mm costing billet-rolling by high speed mill. The fracture cause of steel 65 C during ∅6. 5 mm hot rolled coil cold-drawing to ∅1. 85 mm wire has been analyzed by optical microscope and scanning electron microscope. Test results show that the macro-feature of fracture is pencil-tip in shape

and the structure homogeneity at coil cross section is poor； the cracks originate at coarse proeutectoid ferrite and thick-lamellar cementite in center of section ； and the main causes of fracture are low sorbite percentage

existing large block proeutectoid ferrite and central carbon segregation.

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