Research on the Low Temperature Property of Large Angle Steel Used in Transmission Tower
In the cold region,it is of great significance to select suitable large angle steel in order to prevent the failure or collapse of transmission line tower.A series of tensile tests and impact tests are performed to investigate the mechanical property and impact toughness of large angle steel of Q345B,Q420B in different temperature.It is showed that large angle steel had excellent low temperature property and low temperature plasticity and impact toughness of the material gradually become poor,fracture toughness is worse with the temperature decreasing from-40 ℃ to room temperature.Ductile-brittle transition temperature of Q345B,Q420B are-22 ℃,-20 ℃ respectively.The initial CTOD value of 0 ℃ is 0.352 mm,0.271 mm respectively,and the ductile fracture occurs above 0 ℃.
angle steeltoughnesstensilelow temperatureductile-brittle transition temperature
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