Structure and Electrochemical Behavior of the Rust on 690 MPa Grade Construction Steel in a Simulated Industrial Atmosphere

Zhu, Wenting; Zhao, Yongwu; Yan, Feng; Cui, Junjun; Chen, Zhenye; Chen, Liqing

doi:10.1007/s11661-022-06725-y

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…Boron is susceptible to segregate at grain boundaries, reducing the cores of ferrite formation and inhibiting the phase transformation. 31,32 Akhtar et al 17 also proved through the thermodynamic calculation that the addition of boron decelerated the phase transformation of P91B steel and delayed the nucleation of ferrite during cooling. In addition, numerous researches have shown that boron could promote the bainite transformation.…”

Section: Discussionmentioning

confidence: 97%

Effect of boron on microstructure and mechanical properties of Al-killed high-strength low-alloy steel

Huang,

Li,

Zang

2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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Through the application of experimental analysis and mechanical characterisation, the influence of boron on the microstructure, strength and impact toughness of Al-killed high-strength low-alloy steel was examined. The results showed that with increasing boron content, the area fraction and average size of martensite–austenite constituents increased by 11.8% and 2.04 μm, respectively. Owing to the strengthening and combining effects of boron, the proportion of low angle grain boundaries in the boron-containing steel increased from 67.94% to 79.41% in comparison to the boron-free steel. After adding 0.0014% boron, the tensile and yield strength increased by 14.65% and 3.66%, respectively, due to the increasing content of martensite–austenite constituents. The long strip and large-sized martensite–austenite constituents of the steel matrix with 0.003% boron easily became the source of cracks and facilitated crack propagation, resulting in a decrease in strength. The toughness tested at −20 °C of the steel was severely worsened after adding boron, and the impact absorbed energy decreased from 105 to 7.4 J. This was because boron increased the martensite–austenite constituents, low angle grain boundaries and random boundaries, which favoured crack generation and propagation during the impact process, resulting in a sharp deterioration of toughness.

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Section: Discussionmentioning

confidence: 97%

Effect of boron on microstructure and mechanical properties of Al-killed high-strength low-alloy steel

Huang,

Li,

Zang

2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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“…The specimens were prepared from a 690 MPa grade HSS steel, which was produced to be aseismic and resistant to fire and corrosion. [17][18][19][20] The chemical composition of the 690 MPa grade HSS steel is provided in Table 1. The values of welding crack susceptibility index (P cm ) and carbon equivalent (C eq ) were 0.23% and 0.48%, respectively, meeting the China National Standard GB/T 19879-2015.…”

Section: Test Specimensmentioning

confidence: 99%

Post‐fire Mechanical Behaviors and the Mechanism of their Influence on a 690 MPa Grade High‐Strength Steel for High‐Rise Buildings

Zhu

Cui

Yan

et al. 2022

steel research int.

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Herein, the residual mechanical behaviors of a 690 MPa grade high‐strength steel after exposure to fire for an extended duration are investigated, and the factors affecting their variation based on the theories of metallurgy are explored. The corresponding tensile properties and microstructure tests are conducted on this steel soaked at 300–900 °C for 3 h and then cooled in air. The results show that there is negligible influence of temperature on residual mechanical properties at 600 °C or lower. It can be considered that the critical fire temperature is 600 °C, beyond which the strength decreases sharply. This can be attributed to the formation of ferrite and grain coarsening. However, at 900 °C, its residual strength can still maintain approximately half of that at room temperature. It is related to the contribution from fine nanoscaled precipitates of 10–40 nm in size. Compared with steels having the same nominal yield strength, the dependence of residual mechanical properties on elevated temperatures for this steel varies due to the difference in microstructure characteristics. New predicted equations are proposed for this novel structural steel to guide on better prediction of residual mechanical properties in steel structure systems.

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“…[1] However, weathering steels cannot be used without painting in some special atmospheric environments, such as industrial atmospheric environments seriously polluted by SO 2 and marine atmospheric environments with high Cl − . [2][3][4][5] In the heavily polluted industrial atmosphere, SO 2 is easily decomposed in aqueous solution and combined with H 2 O to form H 2 SO 3 , which is further oxidized to form H 2 SO 4 , and the SO 4 2− in H 2 SO 4 easily reacts with Fe 2+ generated by the anode to form an "acid regeneration cycle," which further accelerates the dissolution of steel. [6,7] In atmospheric environments with high Cl − , the small size of Cl − is highly penetrating and can easily penetrate the rust layer and corrode further in the steel matrix.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of alternating dry and wet corrosion behavior of Q345qDNH steel and Q420qENH steel in industrial atmospheric media containing PM2.5

Guo,

Zhou,

et al. 2024

Materials & Corrosion

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The corrosion behavior of Q345qDNH steel and Q420qENH steel under the industrial atmosphere containing PM2.5, as well as the effect of PM2.5 on the rust layer were studied by dry–wet alternating accelerated corrosion experiment. The results show that the corrosion rate of Q345qDNH is always less than that of Q420qENH, the Cr content of rust layer is higher than that of Q420qENH steel. After 30 days of corrosion, compared with Q420qENH steel, the self‐corrosion potential of Q345qDNH is larger, the self‐corrosion current density is smaller, and the rust resistance is 1.49 times of Q420qENH steel, the Iα‐FeOOH/Iγ‐FeOOH ratio is 1.29 times of Q420qENH, indicating that the protection of the rust layer of Q345qDNH is better than that of Q420qENH. This is due to the effect of microstructure factors in the early stage of corrosion and alloying elements in the late stage of corrosion. PM2.5 with SiO2 as the main component is easy to deposit at cracks and holes, which becomes the nucleation substrate for corrosion products, promotes the nonuniform nucleation of corrosion products, making the rust layer develop unevenly, leading to an increase in holes in the outer rust layer.

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Structure and Electrochemical Behavior of the Rust on 690 MPa Grade Construction Steel in a Simulated Industrial Atmosphere

Cited by 6 publications

References 47 publications

Effect of boron on microstructure and mechanical properties of Al-killed high-strength low-alloy steel

Effect of boron on microstructure and mechanical properties of Al-killed high-strength low-alloy steel

Post‐fire Mechanical Behaviors and the Mechanism of their Influence on a 690 MPa Grade High‐Strength Steel for High‐Rise Buildings

Comparative study of alternating dry and wet corrosion behavior of Q345qDNH steel and Q420qENH steel in industrial atmospheric media containing PM2.5

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