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 JIS..., The purpose built nonstandard or special use products as per customer's demand, we will try our best to satisfy it.