Development and application of high strength complex phase steel HR680/800CP for automobile chassis

Tan Daqing; Zhou Li; Jia Guoxiang; Cao Xiao’en; Wen Caijun; Xue Renjie

doi:10.7513/j.issn.1004-7638.2023.04.024

Volume 44 Issue 4

Aug. 2023

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Tan Daqing, Zhou Li, Jia Guoxiang, Cao Xiao’en, Wen Caijun, Xue Renjie. Development and application of high strength complex phase steel HR680/800CP for automobile chassis[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(4): 167-172. doi: 10.7513/j.issn.1004-7638.2023.04.024

Citation:

Tan Daqing, Zhou Li, Jia Guoxiang, Cao Xiao’en, Wen Caijun, Xue Renjie. Development and application of high strength complex phase steel HR680/800CP for automobile chassis[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(4): 167-172. doi: 10.7513/j.issn.1004-7638.2023.04.024

Citation:

Tan Daqing, Zhou Li, Jia Guoxiang, Cao Xiao’en, Wen Caijun, Xue Renjie. Development and application of high strength complex phase steel HR680/800CP for automobile chassis[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(4): 167-172. doi: 10.7513/j.issn.1004-7638.2023.04.024

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Development and application of high strength complex phase steel HR680/800CP for automobile chassis

doi: 10.7513/j.issn.1004-7638.2023.04.024

1.
School of Mechanical Engineering and Automation, Chongqing Industry Polytechnic College, Chongqing 401120, China
2.
Hanbao Steel Plant, Han Steel Company, HBIS Group, Handan 056015, Hebei, China
3.
Technology Center, Han Steel Company, HBIS Group, Handan 056015, Hebei, China
4.
School of Material Science and Engineering , Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China

Received Date: 2022-11-17
Publish Date: 2023-08-30

Abstract

Abstract

Considering lightweight requirement and forming process characteristics of chassis structural parts, a complex alloying system of C-Si-Mn-Nb-Ti-Mo elements had been designed in order to achieve a better performance of weldability, second phase precipitation and bainite transformation at intermediate temperature. Based on theoretically calculation, a TMCP process where FET and CT are set at 890 ℃ and 570 ℃ and uses laminar cooling mode front 3/4, had been developed. During the TMCP process stable rolling steps were within austenite phase zone, and ferrite and bainite transformation occurred upon cooling period during and after laminar process. As a result HR680/800CP was produced which is featured with well flanging and hole expansion property. Microstructure mainly consists of Ferrite/Bainite, and mechanical properties reaches yield strength 769 MPa, tensile strength 840 MPa, elongation 17.92%, hole expansion ratio up to 110%. This product has been successfully used for structure parts of chassis control arm and battery pack bracket in new energy automobile.
- complex phase steel,
- controlled rolling and cooling process,
- bainite,
- misorientation of grain boundaries,
- hole expansion property

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References(15)

References

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