A PROCESS FOR PRODUCTION OF RIGHT ZN-FE BINARY COATING ON STEEL SUBSTRATE WITH IMPROVED PROPERTIES BY A COMBINATION OF HOT DIP GALVANIZING amp; SUBSEQUENT ANNEALING PROCESS UNDER VARIED PROCESS CONDITIONS

摘要

The present invention describes a process of hot dip zinc coating in molten Zn-AI bath followed by annealing cycle to get improved powdering performances of galvannead steel sheet. The bath consists of less Al (0.1-0.128wt%) compared to existing practice of higher Al and the developed annealing cycle consist of lower GA power and higher line speed. The galvannealed product obtained under modified process condition contains less iron compared to the earlier galvannealed material. The tendency to powering is decreased from 10 mg.m2 to 4 mg/m2 under the modified process conditions.