Mechanical response of ultra-high strength (Grade 1200) steel under extreme cooling conditions

Temperature-dependent properties of high-strength steel for evaluating the fire resistance of structures

“…There is a lack of data on the high-temperature property of HSS. Some recent studies (Lange and Wohlfeil, 2010; Azhari et al, 2017; Azhari et al, 2018.) have inferred that HSSs exhibit different variations in properties at elevated temperatures compared to carbon steels, due to variations in microstructure and manufacturing process of HSSs.…”

Experimental and numerical investigation of S700 high strength steel CHS beam–columns after exposure to fire

“…The thermal properties of high strength steels at elevated temperatures, including the thermal expansion, specific heat and thermal conductivity, were experimentally studied by Xing et al [6], with new predictive formulae proposed. The postfire residual material properties of high strength steels with yield stresses ranging from 460 MPa to 1200 MPa have been studied in a series of testing programmes [7][8][9][10][11][12][13][14][15][16][17]. The test results revealed that the extent of reduction in material properties of high strength steels after exposure to fire is different to that of normal strength steels, and new formulae were developed for predicting the post-fire residual material properties of high strength steels.…”

“…The test results revealed that the extent of reduction in material properties of high strength steels after exposure to fire is different to that of normal strength steels, and new formulae were developed for predicting the post-fire residual material properties of high strength steels. Moreover, the influence of cooling methods, including cooling in air, water, fire-fighting foam and liquid nitrogen, on the post-fire residual material properties of high strength steels [12,[14][15][16] were investigated and quantified. Su et al [13] measured the membrane residual stresses in S690 high strength steel welded I-sections after exposure to elevated temperatures ranging from 30 °C to 950 °C, studied their distributions and magnitudes, and proposed predictive models.…”

Comparison of mechanical behavior between longitudinal lap-welded joints and transverse fillet welded joints of high strength steel

“…Thermal cycle within high strength steel while welding have critical influence on the chemical and metallurgical changes, which may affect the mechanical behavior. A series of studies on the performance of butt joints made of HSS [1][2][3][4][5][6][7][8][9][10] have been done in recent years. Due to the microstructure sensitive to the heat input energy, softened zone in heat affected zone (HAZ) was appeared and the strength loss was observed.…”