Under european steel standard EN 10292,hot-dip galvanized steel sheet and coil HX300LAD,HX300LAD+Z,HX300LAD+ZF,H300LAD,H300LAD+ZF,H300LAD+Z,for the name of HX300LAD+Z zinc coated steel coil,LA is short for low alloy or micro-alloyed steels containing one or more of alloy Nb,Ti and V to achieve required proof strength levels.Hot-dip zinc coated steel plate HX300LAD,HX300LAD+Z,HX300LAD+ZF,H300LAD,H300LAD+ZF generally receive surface protection at rolling plants.The period of protection afforded depands on the outside atmospheric conditions.

These surface protection for galvanized steel plate and coil HX300LAD,HX300LAD+Z,HX300LAD+ZF,
H300LAD,H300LAD+ZF including Chemical passivation,Oiling,Chemical passivation and oiling,sealed,
phosphated and untreated.Generally the galvanized steel sheet HX300LAD,HX300LAD+Z,
HX300LAD+ZF,H300LAD,H300LAD+ZF 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.