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April 20, 2020
Tungsten carbide (hard alloy) 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 ℃ It basically remains unchanged, and still has a high hardness at 1000 ℃.
Tungsten carbide, the main components are tungsten carbide and cobalt, which account for 99% of all components, 1% are other metals, so it is called tungsten steel, also known as cemented carbide, and is considered to be the teeth 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 steel. The grain size of the carbide component (or phase) is usually 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 carbide sintering is to press the powder into a blank, then heat it into a sintering furnace to a certain temperature (sintering temperature), and keep it for a certain time (holding time), and then cool it down, so as to obtain the desired performance of tungsten steel material.
①Tungsten cobalt hard alloy
The main components are tungsten carbide (WC) and binder cobalt (Co). Its brand is composed of "YG" ("Hard, Cobalt" Chinese Pinyin prefix) and the average percentage of cobalt content. For example, YG8 means that the average WCo = 8%, and the rest is tungsten-cobalt tungsten carbide.
②Tungsten titanium cobalt hard alloy
The main components are tungsten carbide, titanium carbide (TiC) and cobalt. Its brand is composed of "YT" ("Hard, Titanium" Chinese Pinyin prefix) and the average content of titanium carbide. For example, YT15 means that the average TiC = 15%, and the rest is tungsten titanium cobalt carbide with tungsten carbide and cobalt content.
③Tungsten titanium tantalum (niobium) hard alloy
The main components are tungsten carbide, titanium carbide, tantalum carbide (or niobium carbide) and cobalt. This kind of cemented carbide is also called universal cemented carbide or universal cemented carbide. The brand name is composed of "YW" ("Hard", "Wan" prefix of Chinese Pinyin) followed by 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, especially its high hardness and wear resistance, which basically remain unchanged even at a temperature of 500 ℃. At 1000 ℃ still has a very high hardness. Cemented carbide is widely used as materials, such as turning tools, milling tools, drill bits, boring tools, etc. The cutting speed of the new cemented carbide is hundreds of times that of carbon 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 that it can harden even if it is cooled in air during quenching, and it is very sharp. There are also called white steel.
HSS is a kind of alloy steel with complicated composition, containing carbide forming elements such as tungsten, molybdenum, chromium, vanadium, cobalt and so on. The total amount of alloy elements is about 10-25%. It can still maintain a high hardness under high heat cutting conditions (about 500 ℃), HRC can be above 60. This is the main characteristic of high-speed steel-red hardness. After quenching and tempering at low temperature, the carbon tool steel has a high hardness at room temperature, but when the temperature is higher than 200 ℃, the hardness drops sharply. At 500 ℃, the hardness has dropped to a level similar to the annealing state.
Completely lost the ability to cut metal, which limits the use of carbon tool steel to make cutting tools. The high-speed steel has good red hardness, which makes up for the fatal shortcomings of carbon tool steel.
High-speed steel is mainly used to manufacture complex thin blades and impact-resistant metal cutting tools. It can also manufacture high-temperature bearings and cold extrusion molds, such as turning tools, drill bits, hobs, machine saw blades, and demanding molds.