GI sheet galvanized steel sheet , Marvell products are according to national standards GBT12459, GBT13401, U.S. standard ANSIASME B16.9, ANSIASME B16.5B16.47, ANSIASME B16.11, ANSIASME B36.19M B36.10M, ASME B16.20, British standard BS, Germany standard DIN, Japan standard...