The difference between hot hardness and wear resistance

2025-11-21

What is Hot Hardness?

Hot hardness refers to a tool material’s ability to maintain its hardness and cutting performance at high temperatures.
During machining, cutting heat rises. If a tool has poor hot hardness, it will soften, lose cutting strength, and wear out faster.

In one sentence:
➡ Good hot hardness means the tool stays hard and sharp even when it gets hot.

Typical materials:
M35, M42, carbide, and high-performance coatings (TiAlN, AlTiN, etc.)

What is Wear Resistance?

Wear resistance describes a tool’s ability to resist abrasion and surface wear during cutting.
Even without extreme temperatures, friction, impact, and workpiece hardness can cause tool wear.

In one sentence:
➡ Good wear resistance means the tool lasts longer and resists abrasion.

Typical materials:
Carbide, and coatings such as TiSiN, AlCrN, etc.

Key Differences

Property	Focus	Conditions	What It Affects
Hot Hardness	Hardness retention at high temperature	High-speed or high-heat cutting	Prevents softening, edge deformation, tool failure
Wear Resistance	Ability to resist abrasion	Friction and long cutting cycles	Tool life, durability, resistance to wear

Easy to Remember

Hot hardness = stays hard when hot
Wear resistance = hard to wear out

Both properties are essential for achieving stable machining and long tool life.

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The difference between hot hardness and wear resistance

The difference between hot hardness and wear resistance