Galvannealed steel is carbon steel coated with zinc via hot-dip galvanizing, followed by annealing to form a zinc–iron alloy layer. This process enhances paint adhesion, weldability, and surface hardness. Ideal for post-painted applications in automotive, HVAC, and appliance manufacturing.
Standard : ASTM A653 / A924
Coating Designation : A40 (0.40 oz/ft² total both sides)
Finish : Matte Gray, Non-Spangled
Form : Cold-Rolled, Hot-Dip zinc coated, Annealed
Technical Properties
| Property | Value / Range | Notes |
| Coating Weight | 0.40 oz/ft² (A40) | Total both sides |
| Coating Thickness | ~0.0006 in | Approximate |
| Surface Finish | Matte, non-spangled | Excellent for paint adhesion |
| Weldability | Excellent | Zinc-iron alloy reduces spatter |
| Paintability | Excellent | No pretreatment required |
| Formability | Good | May powder during forming |
| Corrosion Resistance | Moderate to high | Better than bare steel |
Mechanical Properties (Grade 50 – Class 1)
| Property | Value |
| Yield Strength (min) | 50 ksi |
| Tensile Strength (min) | 65 ksi |
| Elongation (2 in) | 12% |
| Hardness (HRB) | 65–75 |
Applications
- Automotive body panels, HVAC ducting, Appliance casings, Roll-formed structural framing
- Pre-painted architectural panels, Stamped automotive parts, Electrical enclosures, Cabinetry and shelving, Wall panels and siding, Custom painted assemblies
Optional Treatments
- Passivation Coating, Oiling, Dry Film Lubricant, Pre-Painting, Embossing/Texturing