What are the differences between HSS and Carbide


High speed steel

High-speed steel (HSS) is a tool steel with high hardness, high wear resistance, and high heat resistance. When quenched, it hardens even when it is cooled in air, and it is sharp. It is also called white steel.

High speed steel is an alloy steel with complex composition, containing carbide-forming elements such as tungsten, molybdenum, chromium, vanadium, and cobalt. The total amount of alloying elements is about 10-25%. It can still maintain high hardness under the condition of high heat generated by high speed cutting (about 500°C), and its HRC can be above 60. This is Red Hardness, which is the most important characteristic of high speed steel.

High-speed steel is mainly used to manufacture complex thin blades and impact-resistant metal cutting tools, as well as high temperature bearings and cold extrusion dies, such as turning tools, drill bits, hobs, machine saw blades, and molds with high demands.

Tungsten Carbide

Tungsten carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, even at a temperature of 500 ° C. It remains unchanged, and it still has a high hardness at 1000 °C.

Tungsten carbide, the main components are tungsten carbide and cobalt, which account for 99% of all components, and 1% is other metals, so it is called tungsten carbide, also known as cemented carbide, and is considered to be the tooth of modern industry.

Tungsten carbide is a sintered composite material composed of at least one metal carbide. Tungsten carbide, cobalt carbide, niobium carbide, titanium carbide, and tantalum carbide are common components of tungsten carbide. The carbide grains are held together using a metallic binder. Binder metals are generally iron group metals, commonly used are cobalt and nickel. Therefore, there are tungsten-cobalt alloys, tungsten-nickel alloys and tungsten-titanium-cobalt alloys.

The sintering of tungsten steel is to press the powder into a billet, then heat it into a sintering furnace to a certain temperature (sintering temperature), keep it for a certain period of time (holding time), and then cool it down to obtain the tungsten steel material with the required properties.

Tungsten carbide is widely used as a material, such as turning tools, milling cutters, drills, boring tools, etc. The cutting speed of the new cemented carbide is hundreds of times that of carbon steel.

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