What hardness is press brake tooling?
Press brake punches and dies are normally supplied in tool steels hardened to roughly 45 to 62 HRC, depending on the grade and whether the working surface is induction hardened or the whole section is through hardened. Harder tools resist wear; tougher tools resist cracking.
Which tool steels are used for press brake tooling?
The common grades are 42CrMo4 for punches and general bodies, and 1.2379, a chromium-molybdenum-vanadium tool steel, for high-wear dies. Lower-alloy medium-carbon steels are used for light-duty dies.
| Grade | Common designation | Typical use | Typical working hardness |
|---|---|---|---|
| 42CrMo4 | EN 1.7225 | Punches and general-purpose bodies | 45 – 52 HRC, usually induction hardened at the tip |
| 1.2379 | X153CrMoV12, D2 type | High-wear dies and long production runs | 58 – 62 HRC, through hardened |
| 1.2842 | O2 type | General punches and dies | 56 – 60 HRC |
| Medium carbon steel | C45 / EN 1.0503 | Light-duty dies | 40 – 48 HRC |
Why is press brake tooling induction hardened rather than through hardened?
Induction hardening puts a hard, wear-resistant layer on the working surfaces while leaving the core tougher. That combination resists wear at the tip, where the load concentrates, without making the whole tool brittle.
- Wear resistance: the tip and shoulders take the sliding contact.
- Toughness: the core absorbs shock and bending load without cracking.
- Distortion: local heating limits the distortion that full hardening would cause.
- Dies, where the load is spread over a wider face, are often through hardened instead.
How does hardness relate to the tool's rated load?
They are different properties. Hardness resists wear and indentation; the rated load per metre depends mainly on the section and geometry of the tool. A hard tool can still be overloaded if the section is small.
| Property | Protects against | Set by |
|---|---|---|
| Hardness | Wear, galling, indentation at the tip | Steel grade and heat treatment |
| Toughness | Cracking and chipping under shock load | Core hardness and alloy content |
| Section and geometry | Bending overload and tool failure | Tool design, not heat treatment |
| Surface treatment | Friction, galling and marking | Coating or surface finish |
Do harder tools have a longer life?
Up to a point. Hardness increases wear life, but beyond roughly 60 HRC the tool becomes more prone to chipping, particularly with narrow tips and interrupted loading. The right choice balances wear life against the risk of a sudden failure.
Related technical pages
Tooling load calculator
Compare the load per metre with the tool's rating.
Regrinding guide
How regrinding changes the tool and when to replace it.
Press brake punches
Punch profiles and which grade suits which duty.
Press brake dies
Die types and the loads they carry.
Next step
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