Why do the water wel drilling bits have different colors

 What is the difference between different colors of drill bits?

The color of a drill bit does not directly represent its quality or performance, it is more a reflection of the material of the drill bit, the surface treatment process and the manufacturer's brand identity.

The color of a drill bit is mainly influenced by the following factors

Material:
High-speed steel drill bits: usually silver-white or gray, with high hardness and wear resistance.
Cobalt alloy drill bits: more complex colors, may appear gold, silver or black, etc., with higher heat resistance and toughness.
Carbide alloy drill bits: Various colors, commonly black, gray, gold, etc., with extremely high hardness and good wear resistance.

Surface treatment:
Titanium plating: The surface of titanium plated drills is gold or rainbow color, with good wear resistance, corrosion resistance and thermal conductivity.
Nitriding treatment: Nitriding treated drills have black or gray surface, with high hardness and wear resistance.

Brand Marking:

Different manufacturers may use different colors to identify their products.

Why is color not the only criterion for judging the quality of a drill bit?

Color can be camouflaged: Some poor quality drills imitate the color of high quality drills through surface treatment to mislead consumers.
There is no direct correlation between color and performance: the performance of a drill bit depends mainly on the material, geometry, heat treatment process and other factors, not on the color.

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