Twist Drill Bit Core Materials
Twist drill bits aren't just made from any old piece of iron! They need to possess both red hardness (the ability to maintain hardness at high temperatures) and wear resistance. There are two main types of materials:
High-Speed Steel (HSS): Contains alloys such as tungsten and molybdenum, suitable for processing ordinary metals.
Carbide: Made from sintered tungsten carbide powder, making it easier to handle hard materials like stainless steel.
Material Characteristics Comparison
These two materials are like different schools of martial arts:
High-Speed Steel: Good toughness, can be resharpened, and is affordable, but the continuous working temperature does not exceed 600℃.
Carbide: Hardness comparable to diamond, heat resistance up to 1000℃, but brittle and prone to chipping.
Coating Technology: Modern drill bits often have a titanium coating on the surface, extending their lifespan by 3-5 times.
Choosing the Right Material to Avoid Problems
Choosing the drill bit material based on the material being processed is the smart approach:
Aluminum alloy/wood: Ordinary high-speed steel is perfectly sufficient.
Stainless steel/cast iron: Cobalt-containing high-speed steel or carbide is recommended.
Composite materials: Requires carbide drill bits with special coatings.
Occasional home use: Economical high-speed steel offers the best value for money.
