High Speed Steel
High-speed steel (HSS) is a tool steel with high hardness, high wear resistance and high heat resistance, also known as wind steel or front steel, which means hardening even when cooled in air during quenching, and is very sharp. Also known as white steel.
High-speed steel is a complex alloy steel containing carbide forming elements such as tungsten, molybdenum, chromium, vanadium and cobalt. The total amount of alloying elements is about 10 to 25%. It maintains high hardness under high heat cutting (about 500 ° C) and HRC can be above 60. This is the most important characteristic of high speed steel - red hardness. However, after quenching and low temperature tempering, carbon tool steel has high hardness at room temperature, but when the temperature is higher than 200 °C, the hardness drops sharply, and the hardness at 500 °C has dropped to a similar degree to the annealing state. The ability to cut metal is completely lost, which limits the use of carbon tool steel for cutting tools. High-speed steel, due to its good red hardness, makes up for the fatal shortcomings of carbon tool steel.
High-speed steel is mainly used to manufacture complex thin-edged 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 high-demand molds.
Tungsten steel (hard alloy) has a series of excellent properties such as high hardness, wear resistance, strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, even at temperatures of 500 ° C. It remains essentially unchanged and still has a high hardness at 1000 °C.
Tungsten steel, the main component is tungsten carbide and cobalt, which accounts for 99% of all components, 1% of other metals, so called tungsten steel, also known as cemented carbide, is considered to be the teeth of modern industry.
Tungsten steel is a sintered composite composed of at least one metal carbide. Tungsten carbide, cobalt carbide, tantalum carbide, titanium carbide, and tantalum carbide are common components of tungsten steel. The carbide component (or phase) typically has a grain size between 0.2 and 10 microns, and the carbide grains are bonded together using a metal binder. The bonding metal is generally an iron group metal, and cobalt and nickel are commonly used. Therefore, there are tungsten-cobalt alloys, tungsten-nickel alloys, and tungsten-titanium-cobalt alloys.
Tungsten steel is formed by pressing the powder into a billet, heating it to a certain temperature (sintering temperature) in a sintering furnace, and maintaining it for a certain period of time (heating time), and then cooling it down to obtain a tungsten steel material having desired properties.
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