What is galvanized steel plate?

Galvanized steel plate is a type of steel plate coated with a layer of zinc on its surface. In curtain wall engineering, it is also referred to as galvanized curtain wall embedded plate, serving the purpose of pre-embedded fixation. It is categorized into hot-dip galvanized and cold-dip galvanized steel plates, with the material typically being Q235B. Galvanization is a commonly used economical and effective corrosion protection method, with approximately half of the world's zinc production being used for this process. The primary advantages of galvanized steel sheets include excellent corrosion resistance, paintability, decorative properties, and good formability.

Galvanized steel sheet are generally classified based on production and processing methods into hot-dip galvanized steel plates (currently primarily produced using continuous galvanizing processes), alloyed galvanized steel plates (with a zinc-iron alloy coating), electrogalvanized steel sheets (with good processability), single-sided galvanized and double-sided differential galvanized steel sheets, alloyed, and composite galvanized steel sheets. Currently, the most commonly used type is hot-dip galvanized steel sheet, which is also primarily used in curtain wall installation projects. Although galvanized steel sheet has a higher cost than cold-galvanized steel sheet, due to differences in production processes, it offers superior performance, particularly in terms of service life, ensuring higher engineering quality.

Galvanization effectively prevents steel corrosion and extends service life. The zinc coating thickness is a commonly used method to indicate the thickness of the zinc layer on galvanized steel sheets. Hot-dip galvanization deposits significantly more zinc than cold galvanization, resulting in superior corrosion resistance. The quality requirements for high-grade galvanized steel sheets include specifications and dimensions, surface condition, zinc coating thickness, chemical composition, sheet shape, mechanical properties, and packaging. For national standards on galvanized steel sheets, refer to the new national standard GB/T 2518-2008 for galvanized sheets. Requirements for the chemical composition of the base material of galvanized sheets vary by country. National standards generally test for the content of carbon, manganese, phosphorus, sulfur, and silicon.