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Struggling with processing galvanized steel plates for your production? GNEE Steel provides not only high-quality galvanized steel plates but also a detailed processing and fabrication guide. This article covers cutting, bending, stamping, and welding techniques for our galvanized steel plates, plus tips to avoid common processing issues-helping you improve production efficiency and product quality.
Galvanized steel plates have unique processing requirements due to their zinc coating. Unlike uncoated steel, they require specific tools, parameters, and techniques to prevent coating damage and ensure processing quality.
GNEE Steel's galvanized steel plates are designed for easy processing-with consistent thickness, smooth surfaces, and good formability that supports a wide range of fabrication methods.
Galvanized steel plates
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Cutting Techniques for Galvanized Steel Plates
Cutting is the first step in most galvanized steel plate fabrication processes. The table below outlines recommended cutting methods for different thicknesses:
| Thickness Range | Recommended Cutting Method | Key Parameters | Advantages |
|---|---|---|---|
| 0.3-2.0mm | Shearing (guillotine) | Shear speed: 100-150mm/s; Clearance: 5-10% of thickness | Fast, clean cuts, no heat damage to coating |
| 2.0-6.0mm | Plasma cutting | Current: 30-60A; Cutting speed: 500-800mm/min | High precision, suitable for complex shapes |
| 6.0-12.0mm | Oxy-fuel cutting | Oxygen pressure: 0.5-0.8MPa; Preheat time: 5-10s | Low cost, suitable for thick plates |
| All thicknesses | Laser cutting (CNC) | Power: 500-1500W; Speed: 300-1000mm/min | Highest precision (tolerance ±0.1mm), no burrs |
Cutting Tips to Protect the Zinc Coating:
Use sharp tools: Dull shears or blades cause coating peeling-replace tools when cutting edges show burrs.
Control heat input: For thermal cutting (plasma, oxy-fuel), use the minimum necessary heat to avoid zinc evaporation (which causes porosity in subsequent welding).
Clean cut edges: Remove zinc dross from cut edges with a wire brush-this improves weld quality and prevents corrosion.
Bending and Forming Techniques for Galvanized Steel Plates
Bending and forming are critical for shaping galvanized steel plates into parts like brackets, frames, and panels. The key is to avoid coating cracking and ensure dimensional accuracy.
Recommended Bending Parameters (for S280GD galvanized steel plates):
| Thickness (t) | Minimum Bend Radius | Bending Speed | Temperature | Bending Direction |
|---|---|---|---|---|
| 0.5mm | 0.5t (0.25mm) | 5-10mm/s | Room temp | Any direction |
| 1.0mm | 1t (1.0mm) | 5-10mm/s | Room temp | Any direction |
| 2.0mm | 1.5t (3.0mm) | 3-8mm/s | Room temp | Against rolling direction: 2t |
| 3.0mm | 2t (6.0mm) | 3-5mm/s | Room temp | Against rolling direction: 2.5t |
Bending Tips:
Use coated dies: Rubber or plastic-coated bending dies prevent zinc coating scratches-reduce die wear and improve surface quality.
Avoid over-bending: Over-bending (beyond the material's elastic limit) causes permanent deformation and coating cracking-test on sample pieces first.
Post-bending inspection: Check for coating cracks with a magnifying glass (10x) after bending-repair any cracks with zinc-rich paint.
Welding Techniques for Galvanized Steel Plates
Welding galvanized steel plates requires special care to avoid zinc vapor porosity and maintain corrosion resistance. The following are recommended welding methods:
Gas Metal Arc Welding (GMAW/MIG)
Wire type: ER70S-6 (mild steel wire) or ER70S-G (galvanized steel-specific wire)
Shielding gas: 90%Ar + 10%CO₂ (reduces spatter and porosity)
Parameters (for 2.0mm thickness):
Current: 90-110A
Voltage: 19-21V
Speed: 30-40cm/min
Advantages: High welding speed, low heat input, minimal zinc evaporation
Resistance Spot Welding (RSW)
Electrode type: Copper-chromium-zirconium (resists zinc adhesion)
Parameters (for 1.5mm thickness):
Current: 9-12kA
Time: 0.2-0.3s
Pressure: 3-5kN
Advantages: Ideal for thin plates (0.5-3.0mm), no filler material needed
Welding Tips to Prevent Common Issues:
Clean the weld area: Remove zinc coating from the weld zone (10-15mm on each side) with a wire brush-this reduces zinc vapor porosity.
Use pulsed welding: Pulsed GMAW reduces heat input, minimizing zinc evaporation and spatter.
Post-weld treatment: Grind weld beads smooth and touch up with zinc-rich paint to restore corrosion resistance.
Ventilate the area: Zinc vapor is harmful-ensure good ventilation during welding to protect workers.
Stamping and Deep Drawing for Galvanized Steel Plates
GNEE Steel's galvanized steel plates (especially DX53D+Z and S220GD+Z grades) are ideal for stamping and deep drawing-common processes in home appliance and automotive manufacturing.
Recommended Stamping Parameters:
- Lubrication: Use water-based lubricants (avoid oil-based lubricants that are hard to clean) to reduce friction and prevent coating damage.
- Blank holder force: 10-15% of the material's yield strength (e.g., 30-45kN for S280GD, 1.0mm thickness).
- Drawing speed: 50-100mm/s (slower for deep draws to avoid wrinkling).
- Die radius: Minimum die radius = 2-3x material thickness (prevents coating cracking).
Deep Drawing Capabilities (for DX53D+Z):
| Thickness | Maximum Drawing Ratio (Depth/Diameter) | Suitable Parts |
|---|---|---|
| 0.3mm | 0.8:1 | Small cups, washers |
| 0.5mm | 0.6:1 | Fridge inner liners |
| 1.0mm | 0.4:1 | Washing machine components |
Stamping Tips:
- Use polished dies: Highly polished dies (Ra ≤0.8μm) reduce friction and ensure a smooth surface finish on stamped parts.
- Control blank temperature: Keep blanks at 20-30°C-cold temperatures reduce formability, while high temperatures cause lubricant breakdown.
- Inspect parts for defects: Check for coating peeling, wrinkling, or cracking after stamping-adjust parameters if defects occur.
Common Processing Issues and Solutions for Galvanized Steel Plates
Even with proper techniques, you may encounter processing issues. The table below lists common problems and solutions:
| Processing Issue | Cause | Solution |
|---|---|---|
| Coating peeling during cutting | Dull tools, excessive cutting force | Replace with sharp tools; reduce cutting force by 10-15% |
| Porosity in welds | Zinc evaporation, dirty weld area | Clean weld zone; use pulsed welding; increase travel speed |
| Cracking during bending | Small bend radius, cold material | Increase bend radius to ≥1.5t; warm material to 20-30°C |
| Wrinkling during stamping | Insufficient blank holder force, uneven lubrication | Increase blank holder force by 10%; ensure uniform lubrication |
| Scratches on surface | Dirty tools/dies, lack of protective coating on dies | Clean tools; use rubber/plastic-coated dies |
GNEE Steel's galvanized steel plates are easy to process with the right techniques-supporting cutting, bending, welding, and stamping for diverse applications. By following our processing guide, you can avoid common issues, improve production efficiency, and maintain the plates' corrosion resistance and quality.
If you need further assistance with processing galvanized steel plates-whether it's parameter setting, tool selection, or troubleshooting-our technical team is here to help. Contact GNEE Steel now to get personalized processing advice and high-quality galvanized steel plates for your production needs!
