Analysis and Study on Cracking of Q345 GNH Weathering Steel End Beam
Q345 GNH weathering steel has been widely used in environments such as containers,railway vehi-cles,bridges,etc.that require resistance to atmospheric corrosion.This article conducts macroscopic inspec-tion,chemical composition analysis,metallographic examination,mechanical property analysis,and fracture a-nalysis on the cracking of Q345 GNH weathering steel end beams.The causes of cracking are discussed,and it is proposed that the low content of acid soluble aluminum and the segregation of trace element P at grain boundaries are the main reasons for the significantly low room temperature toughness and susceptibility to brittle cracking of the weathering steel.This provides a reference for the industry to deal with similar problems.
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