Building Material PPGI Color Coated Prepainted Steel Metal Roof Sheet Price 20 Gauge Gi Galvanized Corrugated Sheet Roofing Sheet Building Material Dx51d Z30~Z275 Zinc Coated Gi ASTM Metal Roof Sheet
Al-Mg-Mn Alloy Sheet for building ,The corrugated steel sheet is made by cold-rolled steel plate, electro-galvanized steel plate, hot-dip galvanized steel plate or galvanized steel plate as substrate after surface degreasing, phosphating, chromate treatment, and coated with organic coating. .