ALUZINC-COATED SHEET

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MANUFACTURING PROCESS

Aluminium-zinc coated sheet has a surface coating that consists of a mixture of 55% aluminium, 43% zinc and 2% silicon. Its corrosion resistance is significantly better than that of a hot-dip galvanised sheet. How much better depends on the ambient environment. Thanks to the high content of aluminium, an aluminium-zinc coated sheet is able to withstand high temperatures without discolouration, and its light-reflective appearance makes it suitable for, e.g., roof coverings. Aluminium-zinc coated sheet is available in thicknesses of 0.3 to 2.0 mm.

STEEL GRADES

Mild steel:
Used when the steel’s forming and drawing properties are more important than the tensile ones. Available in grades ranging from DX51 to DX54.
Structural steel:
Used for resistant-tested structures in the construction industry. Suitable for roll forming and easier bending.

MECHANICAL PROPERTIES — SOFT STEELS
EN 10 346 Yield strength Re
(N/mm2)		 Tensile strength Rm
(N/mm2)		 Elongation
A80 min. (%)*
DX 51 D + AZ Min. 140 270-500 22
DX 52 D + AZ 140-300 270-420 26
DX 53 D + AZ 140-260 270-380 30
DX 54 D + AZ 140-220 270-350 36
Values are based on samples taken transversely to the direction of rolling.
*) For t ≤ 0.70 mm, two units of a lower value apply.
MECHANICAL PROPERTIES — STRUCTURAL STEELS
EN 10 346 Yield strength Re
min.(N/mm2)		 Tensile strength Rm
min.(N/mm2)		 Elongation
A80 min. (%)*
S 250 GD + AZ 250 300 19
S 280 GD + AZ 280 360 18
S 320 GD + AZ 320 390 17
S 350 GD + AZ 350 420 16
S 550 GD + AZ 550 560 –
Values are based on samples taken along the direction of rolling.
*) For t ≤ 0.70 mm, two units of a lower value apply.
COATING LAYER
Weight class Coating layer, incl. both sides (g/m2) Zinc layer thickness per side* (μm)
Triple Spot Test min Single Spot Test min
AZ 100 100 85 12
AZ 150 150 130 20
AZ 185 185 160 25
*) Layer thickness is calculated based on min. triple spot test values (1 μm = 3.75 g/m2)

SURFACE

Surface appearance: Aluminium-zinc coated sheet is manufactured with a normal rose pattern that is formed after the natural crystallisation of the coating

Surface quality:
A (Normal surface) Small pores, rose pattern variations, dark spots, stripe marks and light passivation stains are permissible. Stretch levelling breaks and zinc run-off marks may appear.
B (Improved surface) Skin-passed material. Small defects such as stretch levelling breaks, skin passing marks, scratches, indentations, rose patterns, zinc run-off marks as well as light passivation marks may appear. The surface exhibits no pores.
We offer by default coating layer AZ 150, surface quality A and surface treatment C, thereby meeting the requirements of the RoHS Directive.
Surface treatment:
C Chemical passivation
0 Oiling
C0 Chemical passivation + oiling
S Special passivation treatment (Anti Finger Print)
We offer by default coating layer AZ 150, surface quality A and surface treatment C, thereby meeting the requirements of the RoHS Directive.

THICKNESS TOLERANCES, ACCORDING TO EN 10 143

THICKNESS TOLERANCES, ACCORDING TO 10 143 (for steel with a specified min. yield strength <260)
Nominal thickness
(mm)		 Thickness tolerances for nominal width (mm)
≤ 1200 > 1200 ≤ 1500 > 1500
≥ 0,35 ≤ 0,40 ± 0,04 ± 0,05 –
> 0,40 ≤ 0,60 ± 0,04 ± 0,05 ± 0,06
> 0,60 ≤ 0,80 ± 0,05 ± 0,06 ± 0,07
> 0,80 ≤ 1,00 ± 0,06 ± 0,07 ± 0,08
> 1,00 ≤ 1,20 ± 0,07 ± 0,08 ± 0,09
> 1,20 ≤ 1,60 ± 0,10 ± 0,11 ± 0,12
> 1,60 ≤ 2,00 ± 0,12 ± 0,13 ± 0,14
> 2,00 ≤ 2,50 ± 0,14 ± 0,15 ± 0,16
> 2,50 ≤ 3,00 ± 0,17 ± 0,17 ± 0,18
For min. yield strength ≥ 260 < 360 N/mm², tolerances are raised by 15-20 %.
For min. yield strength ≥ 360 ≤ 420 N/mm², tolerances are raised by 30-40 %.
Narrower tolerances are available at extra charge.