Hot-dip ALUMINIUM-SILICON (AS) coated flat steel (Aluminised)
Coating identification (AS) – EN 10346
Coating identification (AS) – VDA 239-100

The ”+AS” coating, also known as aluminised, consists of an alloy of aluminium (90%) and silicon (10%), designed to provide excellent corrosion resistance, in particular at high temperatures: the surface remains stable and protected up to approximately 450°C, thanks to the formation of a passivating aluminium oxide layer which isolates the metal from the environment.

Silicon ensures good adhesion between the coating and the steel, enhancing the mechanical strength and stability of the protective layer. Among the advantages of this coating attention must be drawn to high thermal reflectivity (up to 80%), useful for limiting heat dispersion in applications exposed to elevated temperatures.

EN 10346 standard
Aluminium-Silicon (AS) Continuosly hot-dip coated steel flat products for cold forming
Steels for profiling and drawing	Structural steels	Micro-alloyed LAD	Micro-alloyed	Micro-alloyed bake-hardening BD
DX51D+AS	S250GD+AS	HX260LAD+AS	HX160YD+AS	HX180BD+AS
Dx52D+AS	S280GD+AS	HX300LAD+AS	HX180YD+AS	HX220BD+AS
DX53D+AS	S320GD+AS	HX340LAD+AS	HX220YD+AS	HX300BD+AS
DX54D+AS	S350GD+AS	HX380LAD+AS	HX260YD+AS	HX340BD+AS
DX55D+AS		HX420LAD+AS	HX300YD+AS
DX56D+AS		HX460LAD+AS
DX57D+AS		HX500LAD+AS

Possible surface coatings in +AS
Coating class	Typical coating thickness per side in µm	Typical coating range per side in µm
AS060	10	7 ÷ 15
AS080	14	10 ÷ 20
AS100	17	12 ÷ 23
AS120	20	15 ÷ 27
AS150	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

Norma VDA 239-100
Sheet steel for cold forming for the automotive industry
Mild Steel		High Strength Steel LA or HSLA		High Strength Steel IF	Bake Hardenable Steel BH	Dual Phase Steel DP
Cold	Hot	Cold	Hot	Cold	Cold	Cold	Hot
CR0+AS	HR0+AS	CR210LA+AS	HR210LA+AS	CR180IF+AS	CR180BH+AS	CR290Y490T-DP+AS	HR330Y580T-DP+AS
CR1+AS	HR2+AS	CR240LA+AS	HR240LA+AS	CR210IF+AS	CR210BH+AS	CR330Y590T-DP+AS
CR2+AS		CR270LA+AS	HR270LA+AS	CR240IF+AS	CR240BH+AS	CR440Y780T-DP+AS
CR3+AS		CR300LA+AS	HR300LA+AS	CR270IF+AS	CR270BH+AS	CR500Y780T-DP+AS
CR4+AS		CR340LA+AS	HR340LA+AS			CR590Y980T-DP+AS
CR5+AS		CR380LA+AS	HR380LA+AS			CR700Y980T-DP+AS
		CR420LA+AS	HR420LA+AS			CR780Y1180T-DP+AS
		CR460LA+AS	HR460LA+AS
		CR500LA+AS	HR500LA+AS
		CR550LA+AS	HR550LA+AS
			HR600LA+AS
			HR650LA+AS
			HR700LA+AS
Dual Phase Steel with improved formability DH	Multi-Phase Steels with High Global Formability FH	Complex Phase Steel CP		Complex-Phase Steels with Improved Formability CH	Martensitic Steel MS		Ferritic Bainitic Steel FB
Cold	Cold	Cold	Hot	Cold	Cold	Hot	Hot
CR330Y590T-DH+AS	CR600Y980T-FH+AS	CR570Y780T-CP+AS	HR660Y760T-CP+AS	CR780Y980T-CH+AS	CR860Y1100T-MS+AS	HR900Y1180T-MS+AS	HR300Y450T-FB+AS
CR440Y780T-DH+AS	CR850Y1180T-FH+AS	CR780Y980T-CP+AS	HR750Y950T-CP+AS	CR900Y1180T-CH+AS	CR950Y1200T-MS+AS		HR440Y580T-FB+AS
CR700Y980T-DH+AS		CR900Y1180T-CP+AS		CR1000Y1370T-CH+AS	CR1030Y1300T-MS+AS
CR780Y1180T-DH+AS					CR1220Y1500T-MS+AS
					CR1350Y1700T-MS+AS

Possible surface coatings in +AS
Coating class	Coating mass per side in g/m²	Designation according to EN 10346	Thickness per side (information) in µm
30	30 ÷ 65	AS080	10 ÷ 20
45	45 ÷ 85	AS120	15 ÷ 28

Surface Quality
U	Unexposed
E	Exposed

Surface Treatment
P	Prephosphated
O	Oiled

Thanks to these properties aluminised steel is especially suitable for thermal and industrial applications such as furnaces, piping, exhaust systems, heat exchangers and components exposed to high-temperature oxidation, providing long-lasting protection without the need for additional coatings.

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