Development and study of high-strength low-Mo fire-resistant steel

Wan, Rongchun; Sun, Feng; Zhang, Lanting; Shan, Aidang

doi:10.1016/j.matdes.2011.10.055

Cited by 46 publications

(40 citation statements)

References 12 publications

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“…In 2012, the article Development and study of highstrength low-Mo fire-resistant steel [15], by Wan et al, described how an FR steel may be obtained with very good properties at elevated temperatures using a small percentage of Mo (0.15%, instead of 0.30%), adding microalloys of Nb, Ti and V, and applying controlled cooling.…”

Section: Chemical Compositioins (Wt-%)mentioning

confidence: 99%

Study of historical developments in the use of fire resistant steels

García

Biezma

Cuadrado

et al. 2013

Materials at High Temperatures

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This paper presents a review of the most relevant articles on fire-resistant (FR) steels, as part of a research project at the University of the Basque Country (UPV/EHU) on the FR properties of steelstructures. An important characteristic of FR steels is that they maintain their mechanical properties at high temperatures better than the more widely used structural steels, mainly due to their special chemical composition and the thermal treatment used in their manufacture. The available information on FR steel tests has been analysed. All the data allow us to study the evolution of mechanical properties at different temperatures. We have, in particular, conducted a comparative evolution of the yield stress (YE) and the yield stress ratio (Ra) at different temperatures. A summary is also presented of the most important elements in their composition and the different manufacturing treatments of these steels and their influence on the initial YE and RA at different temperatures. For example, molybdenum and niobium improve the YE considerably at elevated temperatures. The alloy Cr-Mo-V-Nb is considered effective in FR steels and the use of boron is recommended, if an FR steelstructure is required to withstand temperatures higher than 700ºC and to decrease the percentage of carbon.In view of the temperatures associated with manufacturing treatments, it should be recalled that although accelerated cooling, such as quenching, increases YE at room temperature and at high temperatures, it reduces the Ra of these steels. The most effective thermal treatment is air cooling, although special attention should be paid to the influence of slab reheating and the finish rolling temperature.

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Section: Chemical Compositioins (Wt-%)mentioning

confidence: 99%

Study of historical developments in the use of fire resistant steels

García

Biezma

Cuadrado

et al. 2013

Materials at High Temperatures

View full text Add to dashboard Cite

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“…The fire-resistance of steel is generally measured at 600 °C after being held at 600 °C for 3 h [ 21 , 22 , 23 , 24 , 25 , 26 ]. Generally, the ratio of yield strength at 600 °C to that at room temperature is used to evaluate the steel’s fire-resistance.…”

Section: Introductionmentioning

confidence: 99%

“…It is widely recognized that precipitation strengthening is an important approach to improve the strength of steel at elevated temperatures. The supersaturated precipitates in ferrite can effectively improve the fire-resistance of steel by precipitation during reheating [ 22 , 23 , 24 , 25 , 26 ]. However, it is difficult to simultaneously improve the strength of steel at room temperature and at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Interphase Precipitation on the Mechanical Behavior of Fire-Resistant Steels at an Elevated Temperature

Cong

Fan

et al. 2020

Materials

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In this study, we address the challenge of obtaining high strength at ambient and elevated temperatures in fire-resistant Ti–Mo–V steel with ferrite microstructures through thermo-mechanical controlled processing (TMCP). Thermally stable interphase precipitation of (Ti, Mo, V)C was an important criterion for retaining strength at elevated temperatures. Electron microscopy indicated that interphase precipitation occurred during continuous cooling after controlled rolling, where the volume fraction of interphase precipitation was controlled by the laminar cooling temperature. The interphase precipitation of MC carbides with an NaCl-type crystal structure indicated a Baker–Nutting (B–N) orientation relationship with ferrite. When the steel was isothermally held at 600 °C for up to 3 h, interphase precipitation occurred during TMCP with high thermal stability. At the same time, some random precipitation took place during isothermal holding. The interphase precipitation increased the elastic modulus of the experimental steels at an elevated temperature. It is proposed that fire-resistant steel with thermally stable interphase precipitation is preferred, which enhances precipitation strengthening and dislocation strengthening at elevated temperatures.

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“…However, as an expensive alloying element, high-addition of Mo will greatly increase the cost. Therefore, an alternative method by 2 of 13 microalloying of Nb, V, and Ti and controlled accelerated cooling was introduced to low carbon low Mo steels for fire-resistant applications [1,9,10]. In this method, bainite strengthening was obtained by controlled accelerated cooling, and remained microalloying elements of Nb, V, and Ti in solid-solution precipitates as nanometer-sized MC-type carbides at elevated temperature in fire to provide high temperature strength.…”

Section: Introductionmentioning

confidence: 99%

Study of Nanometer-Sized Precipitation and Properties of Fire Resistant Hot-Rolled Steel

Xie

Song

Chen

et al. 2019

Metals

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Nanometer-sized precipitated carbides in a low carbon Ti-V-Mo bearing steel were obtained through hot rolling and air cooling and were investigated by transmission electron microscopy (TEM). The nanometer-sized interphase-precipitated carbides have been found to exhibit an average diameter of ~6.1 ± 2.7 nm, with an average spacing of ~24–34 nm. Yield strength of 578 ± 20 MPa and tensile strength of 813 ± 25 MPa were achieved with high elongation of 25.0 ± 0.5% at room temperature. The nanometer-sized precipitation exhibited high stability after annealing at high temperatures of 600 °C and 650 °C for 3 h. Average diameters of carbides were statistically measured to be ~6.9 ± 2.3 nm and 8.4 ± 2.6 nm after tempering at high temperatures of 600 °C and 650 °C, respectively. The micro-hardness was ~263–268 HV0.1 after high temperature tempering, which was similar to the hot-rolled sample (273 HV0.1), and yield strength of 325 ± 13 MPa and 278 ± 4 MPa was achieved at elevated temperatures of 600 °C and 650 °C, respectively. The significant decrease of yield strength at 650 °C was attributed to the large decrease in shear modulus.

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Development and study of high-strength low-Mo fire-resistant steel

Cited by 46 publications

References 12 publications

Study of historical developments in the use of fire resistant steels

Study of historical developments in the use of fire resistant steels

The Impact of Interphase Precipitation on the Mechanical Behavior of Fire-Resistant Steels at an Elevated Temperature

Study of Nanometer-Sized Precipitation and Properties of Fire Resistant Hot-Rolled Steel

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