Effect of continuous annealing process on microstructure and properties of 4.5%Cr cold-rolled weathering steel

doi:10.13251/j.issn.0254-6051.2022.02.024

Abstract

Abstract: Effect of annealing process on microstructure and properties of 4.5%Cr cold-rolled weathering steel was studied by simulating continuous annealing process with Multipas annealing machine. The results show that with the increase of annealing temperature, the strength of the tested steel first decreases and then increases. When the annealing temperature is 830 ℃, the strength is the highest, the average yield strength is 353 MPa, and the average tensile strength is about 621 MPa. The cooling rate of 50 ℃/s and 30 ℃/s has limited effect on strength of the tested steel. When the annealing temperature is lower than 800 ℃, only recovery and recrystallization in the tested steel occur, and the microstructure is composed of ferrite, pearlite and carbide. When the annealing temperature is higher than 800 ℃, the ferrite is austenitized and bainite is formed in the tested steel after cooling. When the mass fraction of Cr increases to 4.5%, the relative corrosion rate of the tested steel is 26%(relative to Q345B steel), and compared with ordinary weathering steel SPA-C, its weathering performance is doubled.

Key words: 4.5%Cr cold-rolled weathering steel, continuous annealing process, bainite, mechanical properties

CLC Number:

TB31

Yu Bo, Zhang Yi, Wang Zhanye, Chai Litao. Effect of continuous annealing process on microstructure and properties of 4.5%Cr cold-rolled weathering steel[J]. Heat Treatment of Metals, 2022, 47(2): 137-140.

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