Effect of Cr content on the austenitization of 500 MPa class high-strength seismic rebars

Wang Wentao; Liu Xing; Cao Jianchun; Chen Wei; Yin Shubiao

doi:10.7513/j.issn.1004-7638.2023.05.023

Volume 44 Issue 5

Oct. 2023

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Wang Wentao, Liu Xing, Cao Jianchun, Chen Wei, Yin Shubiao. Effect of Cr content on the austenitization of 500 MPa class high-strength seismic rebars[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(5): 151-157. doi: 10.7513/j.issn.1004-7638.2023.05.023

Citation:

Wang Wentao, Liu Xing, Cao Jianchun, Chen Wei, Yin Shubiao. Effect of Cr content on the austenitization of 500 MPa class high-strength seismic rebars[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(5): 151-157. doi: 10.7513/j.issn.1004-7638.2023.05.023

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Effect of Cr content on the austenitization of 500 MPa class high-strength seismic rebars

doi: 10.7513/j.issn.1004-7638.2023.05.023

1.
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Baowu Iron & Steel Group Kunming Iron & Steel Co., Ltd., Kunming 650302, Yunnan, China
3.
School of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

Received Date: 2022-03-30
Available Online: 2023-11-04
Publish Date: 2023-10-31

Abstract

Abstract

The microstructure was observed by means of optical microscope, scanning electron microscope, etc. The change of austenite grains of the steels with different Cr contents under different reheating temperature and holding time of the casting billet was studied. The effect of Cr content on austenitization of 500 MPa high-strength seismic-resistant rebar was discussed. The results show that the effect of Cr content on austenite grain is different in different reheating temperature range. In the temperature range of 950～1150 ℃, the growth rate of austenite grain in Cr-containing steel is slow when the reheating temperature is lower than 1050 ℃, and the size of austenite grain decreases with the increase of Cr content. When the temperature is higher than 1050 ℃, the growth rate of austenite grain increases, and the size of austenite grain increases with the increase of Cr content. At the same reheating temperature, austenite grains grow up with the extension of holding time. When the content of Cr is high, with the increase of the reheating temperature or the extension of the holding time, the segregation of Cr at the grain boundary is weakened, leading to the growth and coarsening of austenite grains more easily. Fine and uniform austenite structure can be obtained under the condition of 1050 ℃ and 30 min reheating temperature.
- Cr-containing rebars,
- austenitization,
- slab,
- reheating temperature,
- growth rate

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References(12)

References

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