Analysis on Cold Drawing Fracture Cause of B7 Steel Rod Coil and Process Improvement

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Analysis on Cold Drawing Fracture Cause of B7 Steel Rod Coil and Process Improvement

更新时间：2026-01-21

- Analysis on Cold Drawing Fracture Cause of B7 Steel Rod Coil and Process Improvement
- Special Steel Vol. 42, Issue 2, Pages: 28-30(2021)
- 作者机构：
  
  芜湖新兴铸管有限责任公司研究院,芜湖,241002
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：15 April 2022，
  
  Published：15 April 2021
- 稿件说明：
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史杨. Analysis on Cold Drawing Fracture Cause of B7 Steel Rod Coil and Process Improvement[J]. Special Steel, 2021, 42(2): 28-30.
DOI：

史杨. Analysis on Cold Drawing Fracture Cause of B7 Steel Rod Coil and Process Improvement[J]. Special Steel, 2021, 42(2): 28-30. DOI：

摘要

B7钢Φ22 mm热轧盘条在冷拔中断裂

采用断口观察、化学成分、显微组织检验以及能谱分析测试了断裂盘条。测试结果表明:Mn、Cr偏析导致盘条中心存在马氏体组织是造成拉拔断裂的原因。通过轧制吐丝温度由905～915℃降至840～850℃以及保温时间由285 s延长至420s

可有效减少心部马氏体的产生

消除了冷拔断裂现象。

Abstract

B7 steel Φ22 mm hot-rolled rod is fractured in cold of drawing

the fractured rod is tested by chemical composition

fractography

microstructure and energy spectrum analysis. The tested results indicate that the segregation of alloy elements Mn and Cr results in that martensite exists at the center of rod caused drawing fracture. By optimizing the rolling process of reducing the coiling temperature from 905 ~915

℃ t

o 840 ~ 850 °C and extending the holding time from 285s to 420s

martensite at the center can be effectively reduced to eliminate cold drawing rod fracture phenomenon.

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