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Study on the Production Process of 780MPa Grade Steel Plates With Low Yield Ratio for High-Rise Buildings

Xiaoguang Zhou

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Abstract

Steel plate for buildings with high strength and low yield ratio was studied in laboratory.The microstructure of test steel was controlled by proper composition design,controlled rolling and UFC technology in order to increase strength and decrease yield ratio.It has been shown that the composite microstructure of soft phase(bainite ferrite) and hard phase(M/A) can be obtained when UFC final cooling temperature was about 690 ℃,and the percentage of M/A component is about 9.2%.The yield strength and tensile strength could meet the requirements of 780 MPa grade,and the yield ratio was about 0.7.

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What this paper is about

Steel plate for buildings with high strength and low yield ratio was studied in laboratory.The microstructure of test steel was controlled by proper composition design,controlled rolling and UFC technology in order to increase strength and decrease yield ratio.It has been shown that the composite microstructure of soft phase(bainite ferrite) and hard phase(M/A) can be obtained when UFC final cooling temperature was about 690 ℃,and the percentage of M/A component is about 9.2%.The yield strength and tensile strength could meet the requirements of 780 MPa grade,and the yield ratio was about 0.7.

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Available abstract

Steel plate for buildings with high strength and low yield ratio was studied in laboratory.The microstructure of test steel was controlled by proper composition design,controlled rolling and UFC technology in order to increase strength and decrease yield ratio.It has been shown that the composite microstructure of soft phase(bainite ferrite) and hard phase(M/A) can be obtained when UFC final cooling temperature was about 690 ℃,and the percentage of M/A component is about 9.2%.The yield strength and tensile strength could meet the requirements of 780 MPa grade,and the yield ratio was about 0.7.

Key concepts: Microstructure, Bainite, Materials science, Ferrite (magnet), Yield (engineering), Ultimate tensile strength, Metallurgy, Composite number

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