DX51D to DX56D Hot Dipped Galvanized Steel Strip
Forming grade galvanized strip, zinc 30 to 350 g/m2, 0.15 to 1.0 mm, slit 5 to 1500 mm.
What This Grade Range Is For
The DX ladder is the galvanized equivalent of the DC drawing qualities. DX51D covers ordinary bending and roll forming, and formability improves at every step up to DX56D, which takes deep drawn work with the zinc still on it. Because the coating is applied before you form the part, corrosion protection reaches the surfaces a post treatment would never touch. Zinc runs from 30 to 350 gram per square metre and gauge from 0.15 mm to 1.0 mm.
Specifications
| Quality Designation | DX51D - DX56D |
| Temper | Annealed |
| Zinc Weight | 30 - 350 gram/m2 |
| Thickness | 0.15 - 1.0 mm |
| Width | 5 - 1500 mm |
Ranges as supplied. Exact grade within the range is confirmed against your application.
Key Benefits
- Zinc is already on the strip, so forming is the last step instead of the first
- Sacrificial protection continues to guard small scratches and cut edges nearby
- The full 30 to 350 gram per square metre coating range, set independently of the steel grade
- Formability graded from DX51D to DX56D so severe draws stay possible
Problems It Solves
- Zinc flakes off at the bend because the coating weight was heavier than the radius allows
- Painting after forming adds a process step and a rework loop
- Internal surfaces of a formed part cannot be coated after assembly
- A heavier coating is specified than the service life actually needs
Who It Is For
- HVAC and ducting manufacturers
- Outdoor enclosure producers
- Roll formers making light building components
- Appliance manufacturers needing protected hidden parts
Application Scenarios
- Ducting, plenum and HVAC panels
- Outdoor enclosures and cabinets
- Roll formed trim, track and light framing
- Deep drawn galvanized housings
Technical Features
- Hot dip coating applied continuously to the strip before slitting
- Coating weight quoted as the total across both surfaces
- Formability ladder DX51D, DX52D, DX53D, DX54D, DX55D, DX56D
How This Material Reaches You
Materials
- Hot dipped galvanized low carbon steel, forming grades DX51D to DX56D
Quality Control
- Coating weight verified against the ordered gram per square metre figure
- Adhesion checked by bend test so the zinc does not flake in production
- Thickness and slit width checked across the coil
Customization Options
- Coating weight chosen against the service environment
- Forming grade chosen against the draw depth
- Slit width from 5 mm for narrow roll formed sections
How It Compares With The Alternatives
| Compared With | What Changes |
|---|---|
| DC01 to DC06 Cold Rolled Steel Strip | Identical forming logic without the zinc. DC costs less but the part has to be coated afterwards and the inside faces may stay bare. |
| S260GD to S550GD Structural Galvanized Strip | Same coating, different steel. The S grades are bought for yield strength; the DX grades are bought for forming behaviour. |
| 300 Series Stainless Strip | Stainless resists corrosion through its whole section and costs considerably more. Galvanized protects sacrificially and is the economical choice for hidden or replaceable parts. |
Getting The Specification Right First Time
- Match the coating weight to the exposure, not to habit, because heavier zinc bends worse
- Test the bend radius on the actual coating weight before committing the tool
- Remember the cut edge stays protected only over a short distance, so plan long exposed edges
- Specify the forming grade and the coating weight as two separate decisions
What to Include in Your Enquiry
- The part and how it is formed, including the tightest bend radius
- The service environment and expected design life
- The strip width your die or roll former actually needs
- Coil inner diameter and maximum coil weight your decoiler accepts
DX51D to DX56D Hot Dipped Galvanized Steel Strip Questions
How much zinc do I need?
Will the zinc crack when I form the part?
Is the cut edge protected after slitting?
What is the thinnest galvanized strip you supply?
Related Materials
Related Guides
Material GuideZinc Coating Weight Guide for Hot Dipped Galvanized Strip
Coating weight decides both how long a part survives outdoors and how tightly it can be bent. Those two pull in opposite directions, which is the whole problem.
Read The Guide
Material GuideCold Rolled or Galvanized Choosing the Right Substrate
Uncoated cold rolled strip is cheaper per tonne, but the comparison only makes sense once the cost of coating the finished part is included. This guide sets out where each one belongs.
Read The GuideGet a Quote on Hot Dipped Galvanized
Send the specification or just the part drawing. We will confirm what is achievable in gauge, width and temper before anything is priced.