INFLUENCE OF METALLURGICAL PARAMETERS ON THE APPEARANCE OF GALVANIZED HOT ROLLED STEEL

We studied the possible influence of chemistry and other metallurgical factors on the appearance of the steel. It was found that a higher percentage of the zeta (ζ) layer on the surface caused a dull appearance. This is due to increased thickness of coating across the defect location caused by a higher amount of Silicon in the steel. This is due to the Sandelin effect, which results in the formation of a higher-thickness coating and a modification of the structure of the Zn – Fe layer. A modification of the composition and temperature of the zinc bath, modification of the speed of withdrawal, modification of the pre-treatment given to the surface, etc. are possible solutions to getting a uniform coating appearance.