Does the material change which press brake tooling I need?
Yes, in three ways: the force requirement changes with tensile strength, the achievable radius changes with ductility, and the marking risk changes with surface finish and coating. The die opening, the tool steel and the surface treatment all follow from that.
Tooling considerations by material
The table summarises what changes for each common material. The die opening and the tool steel are the two decisions that matter most.
| Material | Die opening | Main risk | Tooling note |
|---|---|---|---|
| Mild steel | ≈ 8 × t | Little | General-purpose tooling is adequate |
| Stainless steel | ≈ 10 × t | Work hardening, galling, springback | Harder, polished or coated tooling to limit galling |
| Aluminium | ≈ 6 × t | Marking, soft material pickup | Polished or coated tooling; urethane where the face is visible |
| High-strength steel | ≈ 10 × t | High force, springback, cracking | Heavier tool section and a check on the load per metre |
| Galvanised steel | ≈ 8 × t | Coating damage and pickup | Coated tooling and a wider opening |
| Pre-painted steel | ≈ 8 × t | Coating damage | Urethane die or a protective film |
Why does stainless steel need a different die opening?
Stainless steel has a higher tensile strength and work hardens, so it needs more force and springs back more. A wider opening keeps the force and the marking risk under control, at the cost of a larger radius.
- Higher tensile strength means more force for the same thickness.
- Work hardening raises the force further in a tight radius.
- More springback means a bigger overbend correction.
- Galling between the tool and the material is a common problem, solved by polishing or coating.
How does galvanised and coated steel change things?
The zinc or paint layer is softer than the base metal and is easily scuffed or picked up by the tooling, so the surface condition of the tool matters more than its section.
Does the material change the tool steel I should order?
It can. Abrasive materials such as stainless steel and high-strength steel wear tooling faster, so a harder or more wear-resistant grade pays for itself over a production run.
For low-volume work in mild steel, a standard grade is the economical choice, and the extra wear resistance of a premium grade will not be recovered.
What about thick plate?
Thick plate raises the force sharply, because force rises with the square of thickness, so the limiting factor changes from the machine to the tooling. The die opening and the tool's rated load both have to be checked.
| Thickness | Dominant constraint |
|---|---|
| Thin sheet | Marking and minimum flange |
| Medium sheet | Radius and springback |
| Thick plate | Load per metre on the tooling |
| Very thick plate | Machine capacity, handling and tool section |
Related technical pages
Press brake dies
Die types and how the opening is chosen.
Tooling hardness and steel grades
Choosing a grade for an abrasive material.
Urethane dies
For coated and cosmetic sheet.
Tooling load calculator
Checking the load per metre in plate.
Next step
Tell us the material grade and thickness range and we will recommend the die opening, tool steel and surface treatment.
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