Hot-dip ALUMINIUM-ZINC coated flat steel (Aluzinc)
Coating identification (AZ) – EN 10346

The “+AZ” coating is composed of an alloy of aluminium (55%), zinc (43,4%), and silicon (1,6%), designed to offer particularly effective corrosion protection, superior to that of traditional galvanising: at the same thickness, it guarantees up to five times greater resistance in salt spray.

Aluminium forms a stable passivating barrier which protects the surface over time, while zinc continues to provide cathodic protection in the event of scratches or cuts. The presence of silicon improves adhesion of the coating to the substrate and controls its growth during solidification.

Standard EN 10346
Aluminium-Zinc (+AZ) Continuosly hot-dip coated steel flat products for cold forming
Steels for profiling and drawing	Structural steels	Micro-alloyed LAD	Micro-alloyed intertitial-free YD	Micro-alloyed bake-hardening BD
DX51D+AZ	S220GD+AZ	HX260LAD+AZ	HX160YD+AZ	HX180BD+AZ
Dx52D+AZ	S250GD+AZ	HX300LAD+AZ	HX180YD+AZ	HX220BD+AZ
DX53D+AZ	S280GD+AZ	HX340LAD+AZ	HX220YD+AZ	HX300BD+AZ
DX56D+AZ	S320GD+AZ	HX380LAD+AZ	HX260YD+AZ	HX340BD+AZ
	S350GD+AZ	HX420LAD+AZ	HX300YD+AZ
	S390GD+AZ	HX460LAD+AZ
	S420GD+AZ	HX500LAD+AZ
	S450GD+AZ
	S550GD+AZ

Possible surface coatings in +AZ
Coating class	Typical coating thickness per side in µm	Typical coating range per side in µm
AZ100	13	8 ÷ 19
AZ150	20	15 ÷ 27
AZ185	25	19 ÷ 33

Surface Quality
A	As coated surface
B	improved surface
C	Best quality surface

Surface Treatment
C	Chemically passivated
O	Oiled
CO	Passivated and oiled
P	Phosphated
PO	Phosphated and oiled
S	Sealed – antifinger

Among the additional advantages are a bright and uniform surface appearance, remarkable thermal and light reflectivity, and good abrasion resistance. These materials retain their properties unchanged up to 315°C, making them suitable for use even in acidic environments, such as urban or marine contexts. They are not recommended, however, in alkaline atmospheres or livestock environments.

Thanks to the combination of durability, aesthetic stability and high protection, products with the +AZ coating are used in industries such as construction, HVAC, metal roofing, façades, and generally wherever long-lasting resistance to atmospheric agents with low maintenance is required.

Fill in the form to request information