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The particular name comes from the combination of the processes of: Galvanizing followed by the Annealing process. These products consist of a steel substrate to which a zinc coating is applied, then the material is annealed; this operation allows the zinc and iron layers to diffuse into each other forming a Zinc-Iron alloy, on average composed of 88-91% Zinc and 9-12% Iron.The uniform surface and alloy type of the coating, make this material particularly suitable for painting and spot welding.
| Name | Type of coating | Yield strength | Rupture | Elongation | Plastic deformation ratio | Cracking | |
| Quality | Type of coating | Re MPag | Rm MPag | A80 % min | r90 min | n90 min | |
| DX51D | +Z, +ZF, +ZA, +ZM, +AZ, +AS | – | 270 to 500 | 22 | – | – | |
| DX52D | +Z, +ZF, +ZA, +ZM, +AZ, +AS | 140 to 300 | 270 to 420 | 26 | – | – | |
| DX53D | +Z, +ZF, +ZA, +ZM, +AZ, +AS | 140 to 260 | 270 to 380 | 30 | – | – | |
| DX54D | +Z, +ZA | 120 to 220 | 260 to 350 | 36 | 1,6 | 0,18 | |
| DX54D | +ZF, +ZM | 120 to 220 | 260 to 350 | 34 | 1,4 | 0,18 | |
| DX54D | +AZ | 120 to 220 | 260 to 350 | 36 | – | – | |
| DX54D | +AS | 120 to 220 | 260 to 350 | 34 | 1,4 | 0,18 | |
| DX55D | +AS | 140 to 240 | 270 to 370 | 30 | – | – | |
| DX56D | +Z, +ZA | 120 to 180 | 260 to 350 | 39 | 1,9 | 0,21 | |
| DX56D | +ZF, +ZM | 120 to 180 | 260 to 350 | 37 | 1,7 | 0,2 | |
| DX56D | +AZ, +AS | 120 to 180 | 260 to 350 | 39 | 1,7 | 0,2 | |
| DX57D | +Z, +ZA | 120 to 170 | 260 to 350 | 41 | 2,1 | 0,22 | |
| DX57D | +ZF, +ZM | 120 to 170 | 260 to 350 | 39 | 1,9 | 0,21 | |
| DX57D | +AS | 120 to 170 | 260 to 350 | 41 | 1,9 | 0,21 | |
| g 1MPa = 1N/mm2 | |||||||
| Coating name | Minimum weight1) | Typical values of coating thickness per side in the single spot test | Density | ||
| g/m2 | μm | ||||
| Triple spot test | Single spot test | Typical value | Range | ||
| Weight of the zinc-iron (ZF) coating | |||||
| ZF100 | 100 | 85 | 7 | 5-12 | 7,1 |
| ZF120 | 120 | 100 | 8 | 6-13 | |
| 1) The g/m2 include both surfaces | |||||
A | Minor imperfections - such as small honeycombs, variations in grain size, dark spots, light scratches, and passivation spots - are possible |
B | It is obtained through skinpass. Small imperfections - such as scratches due to skinpass, streaks, irregularities (not cavities) - are possible with this kind of surface |
C | It is obtained through skinpass. The best surface does not harm the apparent uniformity of a high color finish class; the other surface must be at least type B |
C | Chemical passivation, traditionally chromium-based; also available free of trivalent chromium, in compliance with the RoHS Directive; greenish residues may remain on the surface that do not alter product characteristics |
O | Oiling using oils that can be removed during greasing without compromising the coating |
CO | Combination of oiling and chemical passivation to enhance the protective effect against corrosion |
S | Organic passivation, commercially referred to as AFP (Anti Finger Print) or SPT (Resin Coating), consisting of a polymer film containing corrosion inhibitors; available free of hexavalent chromium; improves corrosion protection, prevents fingerprinting, facilitates sliding during processing, and acts as a primer during painting |
P | Phosphating, particularly suitable for the application of a subsequent layer of paint |
PO | Combination of phosphating and oiling to improve formability |
U | Without any protection, under the customer’s responsibility |
• Construction (door and window frames, roofing, metal wall structures, false ceilings and ceilings, shutters, profiles in general)
• Household appliances
• Electrical and electronic equipment
• Heating and cooling systems
The coating finish has a bright metallic reflection, which results from the growth of zinc-aluminum crystals as they solidify. The size and brilliance of the crystals may vary, but this does not affect the quality of the coating.
They can be supplied with special finish, surface appearance and surface protection requirements. The surface appearance can be type A, B or C.
Whatever the type of protection, it is very important that during transportation and storage the materials avoid contact with moisture or water as much as possible and be kept in a dry environment.