Design and Performance of 690 MPa Grade Low-Carbon Microalloyed Construction Structural Steel with High Strength and Toughness
Received date: 2020-06-03
Revised date: 2020-07-13
Online published: 2020-11-15
Supported by
National Natural Science Foundation of China(51904071);Fundamental Research Funds for the Central Universities(N180703011);Key Research and Development Program of Hebei Province(18211019D);Start-Up Project of Doctor Scientific Research of Liaoning Province(2020-BS-271)
The rapid development of high-rise buildings has increasingly brought requirements for construction steels with high strength and toughness. For high-rise building structural steels with low yield ratio, good weldability and excellent resistance to fire and corrosion are generally required. However, high grade construction steels with comprehensive properties are yet to be developed. In this study, a 690 MPa grade functionally structured fire and corrosion resistant high strength construction steel was designed based on the thermodynamic calculations of the JMatPro software and interactions among chemical elements. The chemical composition (mass fraction, %) of the designed steel was Fe-0.08C-0.3Si-1.1Mn-0.12(Nb + V + Ti)-1.6(Cr + Cu + Ni + Mo)-0.002B-0.004N. After laboratory melting and a thermomechanical controlled process (TMCP), the microstructure features, strengthening and toughening mechanisms, mechanical properties, and fire and corrosion resistances were characterized and analyzed by EPMA, EBSD, and performance testing. Results show that the microstructure of this low-carbon microalloyed steel at its TMCP state is mainly composed of bainite ferrite, granular bainite, and lath-like bainite. The yield strength, tensile strength, total elongation, and yield ratio at room temperature are 700 MPa, 878 MPa, 20%, and 0.80, respectively, and this steel possesses good low-temperature toughness. This low-carbon microalloyed steel meets requirements for fire resistance at elevated temperatures up to 600oC for 3 h. It is disclosed that the granular bainite plays a positive role in improving corrosion resistance under marine environment. A further analysis shows that the tested steel possesses excellent strength and toughness resulting from the cumulative effects of precipitation strengthening, grain refinement strengthening, dislocation strengthening, and solid solution strengthening. Moreover, after observation and analysis of crack initiation and propagation underneath the fractured surface of low-temperature impacted samples, the microvoids prefer to nucleate at high-angle boundaries containing brittle phases and grow in a Z-type to cross lath-like bainite to consume more energy. Multiple crack deflections are beneficial for toughness improvements.
Wenting ZHU , Junjun CUI , Zhenye CHEN , Yang FENG , Yang ZHAO , Liqing CHEN . Design and Performance of 690 MPa Grade Low-Carbon Microalloyed Construction Structural Steel with High Strength and Toughness[J]. Acta Metall Sin, 2021 , 57(3) : 340 -352 . DOI: 10.11900/0412.1961.2020.00195
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