Effect of ferrite thermal insulation on microstructure and mechanical properties of vanadium microalloyed HRB500 steel rebar

Lv Yuan; Qi Haiquan; Sui Wenjie; Shi Daimin; Xie Guoqing

doi:10.7513/j.issn.1004-7638.2021.01.026

Volume 42 Issue 1

Feb. 2021

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Lv Yuan, Qi Haiquan, Sui Wenjie, Shi Daimin, Xie Guoqing. Effect of ferrite thermal insulation on microstructure and mechanical properties of vanadium microalloyed HRB500 steel rebar[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 160-163. doi: 10.7513/j.issn.1004-7638.2021.01.026

Citation:

Lv Yuan, Qi Haiquan, Sui Wenjie, Shi Daimin, Xie Guoqing. Effect of ferrite thermal insulation on microstructure and mechanical properties of vanadium microalloyed HRB500 steel rebar[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 160-163. doi: 10.7513/j.issn.1004-7638.2021.01.026

Citation:

Lv Yuan, Qi Haiquan, Sui Wenjie, Shi Daimin, Xie Guoqing. Effect of ferrite thermal insulation on microstructure and mechanical properties of vanadium microalloyed HRB500 steel rebar[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 160-163. doi: 10.7513/j.issn.1004-7638.2021.01.026

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Effect of ferrite thermal insulation on microstructure and mechanical properties of vanadium microalloyed HRB500 steel rebar

doi: 10.7513/j.issn.1004-7638.2021.01.026

1.
Guangxi Key Laboratory of New Energy and Building Energy Saving, Guiling University of Technology, Guilin 541004, Guangxi ,China
2.
Guangxi Liuzhou Iron and Steel Co., Ltd., Liuzhou 545002, Guangxi, China

Received Date: 2020-05-06
Publish Date: 2021-02-10

Abstract

Abstract

The thermal simulation compression experiment of austenite deformation and ferrite area insulation was carried out on HRB500 steel rebar by a Gleeble3500 simulator, and the effect of ferrite area insulation technology on microstructure and properties of HRB500 steel rebar was studied. The results show that after the sample was reheated at 980 ℃ × 15 min and then deformed by 80% reduction, as the temperature of the ferrite zone decreases, the pearlite structure gradually breaks down and a small amount of needle-like structure appears in the ferrite, but the hardness changing does not show a clear tendency. During the isothermal holding process, the highest hardness (HV) 300 was obtained after 700 ℃ × 15 min proccess, which was 30 higher than that of the directly cooled sample. This could be attributed to the precipitation strengthening of vanadium carbide, which would decrease when the holding time elongated. The coarsening of the grains counteracts the second phase strengthening effect of vanadium carbide. It can be inferred from the test data that the HRB500 steel rebar produced by conventional hot rolling does not fully take advantage of the second phase strengthening of VC. Insulation at 700 ℃ × 10 ~ 15 min on the workbench after rolling is expected to achieve a strength increment of more than 10 MPa.
- HRB500,
- vanadium microalloyed,
- ferrite zone,
- insulation,
- thermal simulation compression experiment

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References(7)

References

[1]	(周大伟, 李元廷. V-Nb微合金化HRB500钢筋的试制[C]//第二届宝钢学术年会, 2006: 422−424.) Zhou Dawei, Li Yuanting. Trial production of V-Nb micro-alloyed HRB500 reinforced bar[C]. Baosteel BAC 2006, 2006: 422−424.
[2]	Lin Bingsong. Analysis on rolling and process improvement of high-strength reinforced HRB500 steel with vanadium microalloying[J]. China High-Teach Enterprises, 2013,(8):37−38. (林炳松. 钒微合金化HRB500高强度钢筋轧制与工艺改进探析[J]. 中国高新技术企业, 2013,(8):37−38.
[3]	Zhao Liang, Zhang Chaohui, Ju Jiantao, et al. Comparison experiment and research on HRB500 reinforced bars produced by adding V-N alloy and V-Fe alloy[J]. Materials & Heat Treatment, 2007,36(8):35−37. (赵亮, 张朝晖, 巨建涛, 等. 钒铁与钒氮合金生产HRB500钢筋的对比试验研究[J]. 材料热处处理, 2007,36(8):35−37.
[4]	Yang Caifu, Zhang Yongquan, Liu Shuping. Strengthening mechanism in V-N micro-alloyed reinforcing bar steels[J]. Iron and Steel, 2001,36(5):55−57. (杨才福, 张永权, 柳书平. 钒氮微合金化钢筋的强化机制[J]. 钢铁, 2001,36(5):55−57. doi: 10.3321/j.issn:0449-749X.2001.05.015
[5]	OHMORIA, O IK, KAWABATA F, et al. Effect of VN precipitates on formation of grain boundary and intragranular ferrite in a high N-V bearing steel[J]. Journal of the Iron and Steel Institute of Japan, 1998,84(7):797−803.
[6]	(王芳丽. 微合金化钢筋中V、Nb析出行为研究[D]. 重庆: 重庆大学, 2016.) Wang Fangli. Study on precipitation behaviors of V and Nb in microalloyed steel bars[D]. Chongqing: Chongqing University, 2016.
[7]	Wang Andong, Wang Junyu, Tian Linmao. Precipitation law of V (C, N) in austenite of vanadium microalloyed steel[J]. Materials for Mechanical Engineering, 2016,40(8):23−26. (王安东, 王骏宇, 田林茂. V (C, N)在含钒微合金钢奥氏体中的析出规律[J]. 机械工程材料, 2016,40(8):23−26. doi: 10.11973/jxgccl201608006