Effect of Controlled Rolling and Controlled Cooling and Cooling Bed Heat Preservation Process on Mechanical Properties of 42CrMo Steel φ50 mm Rolled Bar

金启邦; 孙世平; 王青海; 年国恩; 鲜奋强

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Effect of Controlled Rolling and Controlled Cooling and Cooling Bed Heat Preservation Process on Mechanical Properties of 42CrMo Steel φ50 mm Rolled Bar

更新时间：2026-01-21

- Effect of Controlled Rolling and Controlled Cooling and Cooling Bed Heat Preservation Process on Mechanical Properties of 42CrMo Steel φ50 mm Rolled Bar
- Special Steel Vol. 42, Issue 5, Pages: 72-74(2021)
- 作者机构：
  
  1. 西宁特殊钢集团有限责任公司1精品小棒线分厂
  2. 股份公司
  3. 技术中心,西宁,810005
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：02 February 2021，
  
  Online First：03 February 2023，
  
  Published：03 February 2021
- 稿件说明：
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金启邦, 孙世平, 王青海, et al. Effect of Controlled Rolling and Controlled Cooling and Cooling Bed Heat Preservation Process on Mechanical Properties of 42CrMo Steel φ50 mm Rolled Bar[J]. Special Steel, 2021, 42(5): 72-74.
DOI：

金启邦, 孙世平, 王青海, et al. Effect of Controlled Rolling and Controlled Cooling and Cooling Bed Heat Preservation Process on Mechanical Properties of 42CrMo Steel φ50 mm Rolled Bar[J]. Special Steel, 2021, 42(5): 72-74. DOI：

摘要

根据棒材线在生产42CrMo钢φ50 mm轧材容易造成硬度偏高，不能满足协议要求。通过控轧控冷结合冷床保温措施

終轧温度由原967～970 ℃降到860 ℃，冷却速率由原0.35℃/s降低到0.17℃/s

金相组织从之前的非平衡态组织贝氏体+铁素体+珠光体优化为铁素体+珠光体，使HB硬度值由原317降至252。由此工艺生产的φ50 mm轧材具有良好的综合力学性能。

Abstract

According to the bar line in hardness value of steel 42CrMo φ50 mm rolled bar too large can not meet the requirements of agreement

through controlled rolling and controlled cooling combined with cooling bed heat preservation measures to decrease the finishing rolling temperature from original 967~970 °C to 860 °C

and reduce the cooling rate from original 0.35 °C to 0.17 °C/s

and optimize the metallographic structure from the previous non-equilibrium phase bainite + ferrite + pearlite to ferrite + pearlite

the HB hardness value of steel decreases from original 317 to 252. Therefrom

the φ50 mm rolled bar produced by this process has good comprehensive mechanical properties.

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