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%.
周云, 杨晓伟, 陈焕德, 张宇. 加热温度对600 MPa级高强钢筋组织及性能的影响[J]. 钢铁, 2020, 55(1): 101-107.
ZHOU Yun, YANG Xiao-wei, CHEN Huan-de, ZHANG Yu. Effect of heating temperature on microstructure and properties of 600 MPa grade high strength steel rebars. Iron and Steel, 2020, 55(1): 101-107.
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2020, Vol. 55 
