HSS and carbide are two of the most common materials used for cutting tools. They differ in hardness, toughness, thermal resistance, service life and price.
The correct choice depends on the workpiece material, machine rigidity, spindle speed, tool holding and required productivity.
HSS – high-speed steel
HSS is a tough and affordable material. It tolerates vibration, impact and less stable cutting conditions better than carbide. It is commonly used at lower cutting speeds and can be suitable for softer materials and specialised applications.
Advantages include:
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lower purchase price,
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good toughness,
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resistance to impact,
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the possibility of resharpening selected tools.
Its disadvantages are lower hardness, shorter service life and lower resistance to high cutting temperatures.
Carbide and solid carbide
Solid-carbide cutters are considerably harder and more heat-resistant than HSS tools. They support higher cutting speeds, longer service life and accurate cutting edges.
Advantages include:
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high hardness,
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longer service life,
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higher spindle speeds and feed rates,
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precise cutting geometry,
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high surface quality when correctly applied.
Carbide is more brittle and sensitive to impact, vibration, poor tool holding and excessive runout.
Which is better for a CNC router?
Carbide cutters are generally the preferred choice for modern high-speed CNC routers. However, HSS tools can also be used successfully when they match the material and cutting conditions.
Tool geometry, flute count, coating, diameter and recommended cutting parameters are just as important as the tool material itself.