Technical differences between carbide and HSS cutting tools, which to use for which material, and total-cost comparison.
One of the most critical daily decisions in your workshop: carbide or HSS? The wrong choice reduces both tool life and part quality. Here's the technical comparison and selection guide.
1. Hardness and Heat Resistance
- HSS (High-Speed Steel): 62-67 HRC hardness, withstands up to ~600°C.
- Carbide (Tungsten Carbide): 89-94 HRA hardness, withstands up to ~1000°C.
Carbide is 3-5× harder with much higher heat tolerance, giving it the edge at high cutting speeds.
2. Cutting Speed
On the same workpiece, carbide can cut 3-10× faster than HSS. On CNC machines this productivity gain translates directly to throughput.
3. Cost
- HSS tool: Cheap upfront — but shorter life
- Carbide tool: 3-5× more expensive — but 5-15× longer life
Total cost of ownership favours carbide on most CNC jobs.
4. When to Use Which?
| Scenario | Recommended |
|---|---|
| Manual lathe/mill, small batch | HSS |
| CNC mass production | Carbide |
| Hardened steel (>45 HRC) | Carbide (coated) |
| Mild steel, aluminium | HSS sufficient |
| Stainless, titanium | Carbide |
| Plastic, wood | HSS |
Bolelli Metal manufactures both categories in standard and custom sizes. Browse our product range.
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