Effect of Cooling Process after Coiling on Structure and Properties of 700 MPa Microalloying Steel Strip

董方; 武利平; 宿成; 闫瑞军; 沈国慧; 刘月

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Effect of Cooling Process after Coiling on Structure and Properties of 700 MPa Microalloying Steel Strip

更新时间：2026-01-21

- Effect of Cooling Process after Coiling on Structure and Properties of 700 MPa Microalloying Steel Strip
- Special Steel Vol. 38, Issue 5, Pages: 61-64(2017)
- 作者机构：
  
  1. 内蒙古科技大学材料与冶金学院,包头,014010
  2. 包钢(集团)公司研发销售部,包头,014010
  3. 北京科技大学冶金与生态工程学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：06 April 2017，
  
  Online First：18 July 2022，
  
  Published：18 July 2017
- 稿件说明：
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董方, 武利平, 宿成, et al. Effect of Cooling Process after Coiling on Structure and Properties of 700 MPa Microalloying Steel Strip[J]. Special Steel, 2017, 38(5): 61-64.
DOI：

董方, 武利平, 宿成, et al. Effect of Cooling Process after Coiling on Structure and Properties of 700 MPa Microalloying Steel Strip[J]. Special Steel, 2017, 38(5): 61-64. DOI：

摘要

700 MPa微合金钢（/%:0.05C

0.18Si

1.80Mn

0.010P

0.003S

0.15Mo

0.10Ti

0.75Nb

0.035V

0.030Al

0.0020Ca）的冶炼工艺为240 t BOF-LF-2150 mm板坯连铸。通过利用金相显微镜、扫描电镜、能谱仪和拉力试验机试验了700 MPa级微合金高强钢轧后

10 mm钢带从600℃卷取时直接取样经3.7 h冷却至室温（25℃）的空冷工艺

和钢带600℃卷取后并堆放在一起经36.2 h缓慢冷却到室温（25℃）的缓冷工艺的组织和性能。结果得出缓冷工艺下

钢带的贝氏体较少

屈服强度高（732~740 MPa）、抗拉强度低（793~799 MPa）、伸长率大（21.0%~23.0%）;空冷工艺下

钢带的贝氏体较多

屈服强度低（647~654 MPa）、抗拉强度高（811~831 MPa）、伸长率较小（15.0%~17.0%）。综合分析

采用缓冷工艺钢带的力学性能要优于空冷钢带的力学性能。

Abstract

The steelmaking process of 700 MPa microalloying steel (/% : 0.05C

0.18Si

1.80Mn

0.010P

0.003S

0.15Mo

0.l0Ti

0.075Nb

0.035V

0.030Al

0.0020Ca) is 240 t BOF-LF-2150 mm slab casting. The structure and mechanical properties of hot-rolled 10 mm strip of 700 MPa microalloying high strength steel air-cooling processcoiling at 600℃. and direct sampling air-cooling for 3.7 h to ambient (25℃ ) and slow-cooling process-coiling at 600℃ and coils stacked slow-cooling for 36.2 h to ambient (25℃)are observed and tested by using optical microscope

scanning electron microscope

energy spectrometer and tensile tester. Results are obtained that with slow-cooling process the amount of bainite in steel strip is relatively less

the steel strip has higher yield strength (732~740 MPa)

lower tensile strength (793~799 MPa) and larger elongation (21.0% 〜23.0% ) ； and with air-cooling process the amount of bainite in steel strip is rather more

the steel strip has lower yield strength (647〜654 MPa)

higher tensile strength (811〜831 MPa) and rather lower elongation (15.0%~17.0% ). Comprehensive consideration

the mechanical properties of steel strip with slow-cooling process are better than that with air-cooling process.

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