Material types
Aluzinc
MANUFACTURING PROCESS
Aluminum-zinc-coated steel has a surface coating consisting of a mixture of 55% aluminum, 43% zinc and 2% silicon. Its corrosion resistance is significantly better than that of hot-dip galvanized steel. How much better depends on the surrounding environment. Thanks to the high aluminum content, aluminum-zinc-coated steel can withstand high temperatures without discoloring and its light-reflecting appearance also makes it suitable for suitable for applications such as roofing. Aluminum-zinc-coated steel is available in thicknesses of approximately 0,3 to 2,0 mm.
Steel grades
Mild steels:
Used when forming and stamping properties are more important than
strength properties. Available in grades from DX51D to DX54D.
Structural steel:
Used for strength-calculated structures within the construction industry.
Suitable for roll forming and simple bending.
Mechanical Properties – Mild Steel
| EN 10346:2015 | Yield strength Re (N/mm²) | Tensile strength Rm (N/mm²) | Elongation A80 min. (%)* |
|---|---|---|---|
| DX51D +AZ | Min. 140 | 270-500 | 22 |
| DX52D +AZ | 140-300 | 270-420 | 26 |
| DX53D +AZ | 140-260 | 270-380 | 30 |
| DX54D +AZ | 120-220 | 260-350 | 36 |
Values are based on samples taken across the rolling direction.
*) For t ≤ 0,70 mm a value two units lower applies.
Mechanical Properties – Structural Steel
| EN 10346:2015 | Yield strength Re min. (N/mm²) | Tensile strength Rm min. (N/mm²) | Elongation A80 min. (%)* |
|---|---|---|---|
| S220GD +AZ | 220 | 300 | 20 |
| S250GD +AZ | 220 | 330 | 19 |
| S280GD +AZ | 280 | 360 | 18 |
| S320GD +AZ | 320 | 390 | 17 |
| S350GD +AZ | 350 | 420 | 16 |
| S550GD +AZ | 550 | 560 | – |
Values are based on samples taken along the rolling direction.
*) For t ≤ 0,70 mm a value two units lower applies.
Coating weights
| Weight class | Coating weight incl. both sides (g/m2) | Zinc coating thickness per side* (μm) | |
|---|---|---|---|
| Triple-spot test min. | Single-spot test min. | ||
| AZ100 | 100 | 85 | 13 |
| AZ150 | 150 | 130 | 20 |
| AZ185 | 185 | 160 | 25 |
*) The zinc thickness is calculated based on the minimum values for the triple-spot test (1 μm = 3,75 g/m2)
Surface
Surface appearance: Aluminium-zinc coated steel is produced with a normal spangle pattern, formed through the natural crystallisation of the coating.
Surface quality
| A (Normal surface) | Minor pores, variations in the spangle pattern, dark spots, streaks and small passivation marks are permitted. Stretcher-strain marks and zinc run-off marks may occur. |
| B (Improved surface) | Skin-passed material. Minor defects such as stretcher-strain marks, skin-pass marks, scratches, indentations, spangle pattern, zinc run-off marks and faint passivation marks may occur. The surface is free from pores. |
Our standard is coating weight AZ150, surface quality A and surface treatment C. Meets the requirements of the RoHS Directive.
Surface treatment
| C | Chemical passivation |
| O | Oiling |
| CO | Chemical passivation + oiling |
| S | Special passivation treatment (Anti-Fingerprint) |
Our standard is coating weight AZ150, surface quality A and surface treatment C. Meets the requirements of the RoHS Directive.
Thickness tolerances
Thickness tolerances, according to EN 10143:2006 (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 |
For yield strength ≥ 260 to < 360 N/mm² tolerances are increased by approx. 20%.
For yield strength ≥ 360 to ≤ 420 N/mm² tolerances are increased by approx. 40%.
Tighter tolerances available at an additional cost.
Width tolerances
Width tolerances, according to EN 10143:2006
| Nominal width w |
Normal tolerances (mm) | |
|---|---|---|
| Under | Over | |
| w ≤ 1200 | 0 | +5 |
| 1200 < w ≤ 1500 | 0 | +6 |
| 1500 < w ≤ 1800 | 0 | +7 |
| w > 1800 | 0 | +8 |
Wide range of materials
We offer a wide range of material grades, including hot-rolled, cold-rolled, hot-dip galvanized, Aluzinc, zinc-magnesium, electro-galvanized, Corrender, and coated materials. Material samples and test certificates can also be provided to document both mechanical and chemical properties.
