加热温度对600 MPa级高强钢筋组织及性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20190172

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Abstract In order to achieve the industrial application of high strength steel rebars,Nb-V microalloyed 600 MPa grade steel rebars were set as studied object,effect of heating temperature on grain growth was studied by confocal laser scanning high-temperature microscope,and plant trial was conducted. The result shows that increasing heating temperature leads to increasing austenite grains.When the heating temperature changes from 1 180 ℃ to 1 270 ℃ and the soaking time is 60 min,the average austenite grain size improves from 58.7 μm to 85.1 μm. When the heating temperature is improved to 1 270 ℃,the average austenite grain size increases to 77.8 μm. In plant trial,with the heating temperature increases from 1 200 ℃ to 1 270 ℃,the proportion of pearlite and the size of the pearlite colony increases,the tensile fracture morphology changes from ductile fracture to quasi-cleavage brittle fracture. While heating at 1 200-1 250 ℃ can produce a steel rebars with a yield strength of 640-659 MPa,a tensile strength of 823-846 MPa,a yield ratio of 1.28-1.30,a elongation rate of 16.6%-19.2%,a maximum force elongation of 10.6%-13.0%.

Key words： high strength rebar heating temperature high-temperature metallography microstructure mechanical property

Received: 18 April 2019

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	Articles by authors
	ZHOU Yun
	YANG Xiao-wei
	CHEN Huan-de
	ZHANG Yu

Cite this article:

ZHOU Yun,YANG Xiao-wei,CHEN Huan-de等. Effect of heating temperature on microstructure and properties of 600 MPa grade high strength steel rebars[J]. Iron and Steel, 2020, 55(1): 101-107.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190172 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I1/101

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