HSS (short for high-speed steel) was the standard material for metal cutting tools in the past. When tungsten carbide was created, it was considered a direct replacement for high-speed steel with good toughness, excellent wear resistance, and extremely high hardness. Cemented carbide is commonly compared to high-speed steel due to similar applications and high hardness.

HSS is high carbon high alloy steel, which is a tool steel with high hardness, high wear resistance, and high-temperature resistance. In the state of quenching, iron, chromium, partial tungsten, and carbon in high-speed steel form an extremely hard carbide, improving the wear resistance of the steel. The other partial tungsten dissolves into the matrix, increasing the red hardness of the steel to 650°C.

Yes, you can drill a square hole with a round bit. Here's how: An auger-type drill bit spins inside a hollow four-sided chisel secured to the mortiser. The bit itself locks into a drill chuck inside the head of the machine. When you pull down on the mortiser's feed lever, the bit and chisel plunge simultaneously into your workpiece.

Hardness, service life and HRC are much lower than tungsten carbide. At a high temperature of 600°C or more than 600°C, the hardness of high-speed steel will be greatly reduced and it cannot be used.

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3. The service life of the mold, measuring tools, and cutting tools made of tungsten carbide is 20 to 150 times that of tool alloy steel.

Tungsten carbide is a micron-sized metal carbide powder that is difficult to melt and has high hardness. The binder is made from cobalt, molybdenum, nickel, etc. It is sintered at high temperatures and high pressures. Tungsten carbide has a higher high-temperature carbide content than high-speed steel. It has HRC 75-80 and excellent wear resistance.

Like all drill bits, the auger bit bores a hole and ejects the chips. Meanwhile, the four sharp edges of the chisel pare the wood around the bored hole into a square shape. The auger bit removes this waste, as well, through a chip ejection slot in the chisel.