It turns out that the difference between tungsten steel and high-speed steel is so big

       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 that it can be hardened even when cooled in air during quenching, and it is very sharp. Also known as white steel.



High-speed steel is a kind of alloy steel with complex composition, which contains carbide-forming elements such as tungsten, molybdenum, chromium, vanadium, and cobalt. The total amount of alloying elements is about 10 to 25%. It can still maintain high hardness under high heat generated by high-speed cutting (about 500 ℃), and the HRC can be above 60. This is the most important characteristic of high-speed steel - red hardness. 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 level to the annealed state. , completely lost the ability to cut metal, which limits the use of carbon tool steel to make cutting tools. High-speed steel makes up for the fatal shortcomings of carbon tool steel due to its good red hardness.



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, drills, hob, machine saw blades and high-demand dies.



Tungsten steel

Tungsten steel 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 typically between 0.2-10 microns, and the carbide grains are held together using a metallic binder. Binder metals are generally iron group metals, commonly used cobalt and nickel. Therefore, there are tungsten-cobalt alloys, tungsten-nickel alloys and tungsten-titanium-cobalt alloys.



The main components of tungsten steel are tungsten carbide and cobalt, which account for 99% of all components, and 1% are other metals, so it is called tungsten steel, also known as cemented carbide. Because of its high hardness, wear resistance, good strength and toughness, heat resistance, corrosion resistance and a series of excellent properties, tungsten steel is also considered as the teeth of modern industry. Especially its high hardness and wear resistance remain basically unchanged even at a temperature of 500°C, and still have a high hardness at 1000°C.



Tungsten steel sintering is to press the powder into a billet, then enter the sintering furnace to heat 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 steel (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.



①Tungsten and cobalt cemented carbide

The main components are tungsten carbide (WC) and binder cobalt (Co). Its grade is composed of "YG" ("hard, cobalt" in Chinese Pinyin) and the percentage of average cobalt content. For example, YG8 means the average WCo=8%, and the rest is tungsten-cobalt carbide of tungsten carbide.



②Tungsten-titanium-cobalt carbide

The main components are tungsten carbide, titanium carbide (TiC) and cobalt. Its grade is composed of "YT" ("hard, titanium" two characters in 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) cemented carbide

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.