Comparison of Mechanical Properties of Q355,Q460 and Q690 Steel at the Cooling Stage of Fire
LOU Guobiao
WANG Mengjie
LI Guoqiang
JIANG Binhui
Abstract：Based on the experimental results,the fracture morphology and mechanical properties of Q355,Q460,and Q690 steels during the cooling stage were analyzed and compared.The results show that when the peak heating temperature is below 700℃,the reduction factors of Young's modulus for Q460 and Q690 steel at the cooling stage are similar.The differences in reduction factor of yield strength f0.2 among the three kinds of steels are large,while they are small in that of yield strength f2.0 and ultimate strength.At peak heating temperatures of 800℃or 900℃,the differences in the reduction factors for Young's modulus and yield strength among Q355,Q460,and Q690 steels at the cooling stage are more pronounced,while the differences in ultimate strength reduction factors are smaller.The high temperature mechanical properties of steel recommended by the existing specification are compared with the mechanical properties of the three kinds of steel at the cooling stage.The results also show that the reduction factors proposed in the existing specifications cannot predict the mechanical properties of steel at the cooling stage well.
Keywords：hot-rolled structural steelfirecooling stagemechanical propertycomparative analysis
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 350-357 )