| The hot-dip galvanizing is one of important methods for resisting corrosion in metal products.With the hot-dip galvanizing, it can improve steel structural member's ability of anticorrosion and antioxidation in nature circumstance, enhance the reliability of structure , extend the product life and reduce the repetitions of steel structural member in production which causes waste in energy. It has positive effect both in improving the social economic effectiveness, protecting environment aspects.For the technological requirement of hot-dip galvanizing, it can partly eliminate hot-rolled structural steel's residual stresses and improve the ductility and the bearing capacity of the steel structures. In order to investigate eliminating effects of residual stresses due to hot dip galvanizing, this thesis take hot-rolled Q235 H-beam steel and high strength (Q420) angle steel as research object, taking material function parameter changed with the temperature variety, it use the ANSYS finite element analysis software to imitate the quencher process, the analysis of temperature field and stress field in the run out table cooling process , hot-dip galvanizing process , air-cooling process after hot-dip galvanizing was made . it get the results of hot-rolled structural steel temperature field and stress field at any time and place. The reasons for the origin and development of hot-rolled structural steel's residual stresses was analyzed. The change of residual stresses due to hot dip galvanizing was compared. two evaluating indicators were introduced. The results show The hot-dip galvanizing is a method for resisting corrosion in metal products can partly eliminate hot-rolled structural steel's residual stresses by its special technic requirement. |
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