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 sharp steel, which means it can harden even when air-cooled during quenching, and it is very sharp. It is also called white steel.
High speed steel is an alloy steel of complex composition, containing carbide-forming elements such as tungsten, molybdenum, chromium, vanadium and cobalt. The total amount of alloying elements is approximately 10-25%. It can still maintain high hardness under high heat generated by high-speed cutting (about 500°C), and the HRC can be above 60. This is the most important characteristic of high-speed steel: hardness red. After quenching and tempering at low temperature, carbon tool steel has very high hardness at room temperature, but when the temperature is higher than 200°C, the hardness drops sharply. At 500°C, the hardness dropped to a level similar to. the annealed state, completely losing the ability to cut metal, which limits the use of carbon tool steel in the manufacture of cutting tools. High speed steel compensates for the fatal flaws of carbon tool steel with its good red hardness.
High speed steel is mainly used to make complex metal cutting tools with thin edges and impact resistance. It can also be used to make high temperature bearings and cold extrusion molds, such as turning tools, drill bits, hobs, mechanical saw blades. and demanding molds.
Tungsten steel
Tungsten steel (tungsten carbide) has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance, etc. ., in particular its high hardness and wear resistance, even at a temperature of 500°C. It remains virtually unchanged and still exhibits high hardness at 1000°C.
The main components of tungsten steel are tungsten carbide and cobalt, which account for 99% of all ingredients, and 1% are other metals, so it is called tungsten steel, also known under the name of cemented carbide, and is considered the tooth of modern industry.
Tungsten steel is a sintered composite material containing at least one metal carbide. Tungsten carbide, cobalt carbide, niobium carbide, titanium carbide and tantalum carbide are common components of tungsten steel. The carbide component (or phase) has a grain size typically between 0.2 and 10 microns, and the carbide grains are held together using a metal binder. The bonding metal is usually an iron group metal, and cobalt and nickel are commonly used. So there are tungsten-cobalt alloys, tungsten-nickel alloys and tungsten-titanium-cobalt alloys.
Tungsten steel sinter casting is to press the powder into a billet, then enter the sintering furnace to heat to a certain temperature (sintering temperature), hold it for a certain time (sintering time). maintaining heat), then cooling it to obtain tungsten. steel material with required performance.
①Tungsten-cobalt carbide
The main components are tungsten carbide (WC) and cobalt (Co) binder. Its brand name is composed of “YG” (the first Chinese pinyin for “hard, cobalt”) and the percentage of medium cobalt content. For example, YG8 means the average WCo = 8%, and the rest is tungsten carbide, tungsten carbide and cobalt.
②Tungsten carbide, titanium and cobalt
The main components are tungsten carbide, titanium carbide (TiC) and cobalt. Its brand consists of “YT” (the Chinese pinyin prefix for “hard and titanium”) and the medium content of titanium carbide. For example, YT15 means average TiC = 15%, and the rest is cobalt cemented tungsten-titanium carbide with tungsten carbide and cobalt content.
③Tungsten-titanium-tantalum carbide (niobium)
The main components are tungsten carbide, titanium carbide, tantalum carbide (or niobium carbide) and cobalt. This type of cemented carbide is also called universal cemented carbide or universal cemented carbide. Its brand name consists of “YW” (prefixed by the Chinese pinyin of “hard” and “wan”) plus a serial number, such as YW1.
Tungsten steel has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance. In particular, its high hardness and wear resistance remain basically unchanged even at a temperature of 500°C. still has high hardness at 1000℃. Carbide is widely used as materials, such as turning tools, milling cutters, drill bits, boring tools, etc. The cutting speed of the new cemented carbide is hundreds of times that of carbon steel.
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