Structural steel SGH440 galvanized steel sheet,SGH400 hot dip galvanized steel plate,SGH400 galvanized steel coil under galvanized steel standard JIS G3302. The period of protection afforded depands on the outside atmospheric conditions.These surface protection for galvanized steel plate and coil SGH400 including Chemical passivation,Oiling,Chemical passivation and oiling,sealed,phosphated and untreated.Generally the galvanized steel sheet SGH400 shall be done surface treatment after rolling,if when customers indicate in their purchase order without surface treatment terms,we can delivery these galvanized steel materials under untreated condition.In this case,there is increased risk of atmospheric corrision.