Hot aluminized

Coated steel in aluminum-silicon or aluminate EN10346: 2009

AREAS OF IMPLEMENTATION

  • Heating
  • Radiators
  • Exhaust systems
  • Cooking

Characteristics

These products consist of a steel substrate on to which a coating consisting of aluminum (90%) and silicon (10%) is applied in continuous hot-dipping. Their main characteristics lie in their excellent corrosion resistance even at high temperatures: up to 450C ° the surface remains unaltered and heat reflection is up to 80%, a key aspect in the realization of heat shields. This excellent corrosion protection is guaranteed by aluminum, which, in contact with oxygen in the air, forms a passivating oxide layer.

The thicknesses of the coating are as follows:

Coating
nomination

minimum weight1)

g/m2

Typical coating thickness values to the face in a single spot test

micron

Density

g/cm3

 

Triple_spot_test

Single_spot_test

Typical value

Range

 

Weight of aluminum-silicon coating (AS)

AS060

60

45

8

6-13

3,0

AS080

80

60

14

10-20

AS100

100

75

17

12-23

AS120

120

90

20

15-27

AS150

150

115

25

19-33

AS2002)

200

150

34

-

1) I g/m2 includes both surfaces

2) Coating not covered by the norm


They can be supplied with special requirements in the coating finish, surface quality and surface protection.

The finish has regular spangle with a very clear color.

The surface appearance can be either A, B or C, unless otherwise requested at the time of the order, the material comes with aspect A.

SURFACE APPEARANCE

A

Some small imperfections are possible such as small pits, variations in the size of the spangle, dark spots, light scratches and passivation marks

B

It is obtained by skin-passing. With this type of surface imperfections such as scratches are possible due to the passing process, streaks, irregularities but not cavities

C

Obtained by skin-passing. The best undamaged surface, the obvious uniformity of a high class finish; the other surface must be at least of type B.

There are various types of surface protection and must be properly indicated in the order:

SURFACE PROTECTION

C

Chemical passivation, traditionally chromium based; also available free of hexavalent chromium in accordance with the RoHS Directive; yellowish residue may be found on the surface but it does not alter the product characteristics

O

Oiled using oils that can be removed during greasing without compromising the coating

CO

Combination of oiling and chemical passivation to improve protection against corrosion

S

Organic passivation, commercially indicated with AFP (Anti Finger Print) or SPT (Resin Coating), consisting of a polymer film containing corrosion inhibitors; available free of hexavalent chromium; improves protection against corrosion, prevents the formation of imprints, facilitates scrolling during processing and behaves as a painting primer

P

Phosphation, particularly suitable for the application of a subsequent layer of paint

PO

Combination of phosphation and oiling to improve formability

U

Without any protection, under the full responsibility of the customer

Whatever form of surface protection is implemented it is very important that, during transport and storage, galvanized materials avoid, as much as possible, contact with moisture or water and are kept in a dry environment.

These steels are available with a wide range of characteristics, from commercial quality (DX51D) to those for deep drawing (DX54D and DX56D), to construction products (S250GD).