ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2012, Vol. 33 ›› Issue (1): 57-69.

• 组织和性能 • 上一篇    下一篇

热轧材冷拉过程65钢硬线断裂分析

张朝磊1,刘雅政1,周乐育1,唐山2   

  1. 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
  • 收稿日期:2011-07-11 出版日期:2012-02-01 发布日期:2022-09-20
  • 作者简介:张朝磊(1984-),男,博士研究生,2008年北京科技大学毕业,特殊钢微合金化、组织性能控制及轧制工艺研究。

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

Zhang Chaolei1, Liu Yazheng1 , Zhou leyu1,Tang Shan2   

  1. 1 School of Materials Science and Engineering, University of Science and Technology, Beijing 100083 ;
    2 Shandong Sanshan Group Co Ltd, Yanggu 252300
  • Received:2011-07-11 Published:2012-02-01 Online:2022-09-20

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。

关键词: 65钢, 硬线, 热轧盘条, 冷拉, 笔尖状断裂, 先共析铁素体, 中心偏析

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.

Key words: Segregation5 C, Hard Wire, Hot-Rolled Coil, Cold Drawing, Pencil-Tip Shaped Fracture, Proeutectoid Ferrite, Central Segregation