Abstract
A process for producing one-side galvannealed steel sheet by masking coat has been developed. The functions of masking coat consisting of sodium silicate, sodium borate, magnesia, titania and alumina are in masking and repelling from molten zinc and easily exfoliating by light bending after galvannealing heat treatment. The ungalvannealed side surface has an excellent cosmetic corrosion resistance due to fine phosphate coating originating from the very small quantity of zinc deposition of several mg/m2. The galvannealed layer can be free from powdering by reducing the coating weight to as low as 20g/m2 on one side with the aid of flame wiping and air knife. Deep drawable steel sheet can be made in a continuous galvanizing line without pre- or post-annealing by adopting an extra low carbon steel stabilized with niobium. Thus produced galvannealed steel sheet is considered to be an excellent material against both perforation and cosmetic corrosion for car body exposed panels.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Transactions of the Iron and Steel Institute of Japan
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
