Production process of high strength and toughness weather-resistant bridge steel Q500qENH

doi:10.13251/j.issn.0254-6051.2021.08.026

Abstract

Abstract: Thermal simulation test and heat treatment test were respectively performed on MMS-200 thermo simulator and laboratory electric heat treatment furnace, then the cooling process and heat treatment process of the high strength and toughness Q500qENH weathering steel for bridge were studied by means of hardness test, tensile and impact properties testing and metallurgical structure observation. The results show that the production process for high strength and toughness Q500qENH weathering steel for bridge includes thermomechanical control process(TMCP) plus tempering. When the cooling rate is 10-20 ℃/s, the re-reddening temperature is 500-550 ℃ and the tempering temperature is 450-500 ℃, the tested steel has better match of high strength-toughness and low yield-strength ratio. The microstructure by TMCP is mainly lath bainite, and after tempering, the microstructure gradually changes from bath to granular and the original austenite grain boundary becomes clearer. Tensile curve of the tested steel changes from vault type to Ludes type with the increase of tempering temperature.

Key words: Q500qENH steel, weathering steel, atmospheric corrosion resistance, thermomechanical control process(TMCP), tempering

CLC Number:

TG142.1

Peng Ningqi, He Hang, Luo Deng, Fan Ming, Li Zhongping. Production process of high strength and toughness weather-resistant bridge steel Q500qENH[J]. Heat Treatment of Metals, 2021, 46(8): 139-143.

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