Come and learn about HSS
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, meaning that it hardens even when cooled in air during quenching and is sharp. It is also called white steel.
High speed steel is an alloy steel with a complex composition containing carbide forming elements such as tungsten, molybdenum, chromium, vanadium and cobalt. The total amount of alloying elements reaches about 10 to 25%. It can maintain high hardness under high heat (about 500℃) in high speed cutting, HRC can be above 60. This is the most important characteristic of HSS – red hardness. And carbon tool steel by quenching and low temperature tempering, at room temperature, although there is a very high hardness, but when the temperature is higher than 200 ℃, the hardness will drop sharply, in 500 ℃ hardness has dropped to a similar degree with the annealed state, completely lost the ability to cut metal, which limits the carbon tool steel cutting tools. And high-speed steel due to good red hardness, to make 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, but also to manufacture high-temperature bearings and cold extrusion dies, such as turning tools, drills, hobs, machine saw blades and demanding dies.
Come and learn about tungsten steel
Tungsten steel (carbide) has a series of excellent properties such as high hardness, wear resistance, better strength and toughness, heat resistance, corrosion resistance, etc. Especially its high hardness and wear resistance remain basically unchanged even at a temperature of 500℃, and still have high hardness at 1000℃.
Tungsten steel, whose main components are tungsten carbide and cobalt, accounts for 99% of all components and 1% of other metals, so it is called tungsten steel, also known as cemented carbide, and is considered to be the teeth of modern industry.
Tungsten steel is a sintered composite material that contains at least one metal carbide composition. 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 in the range of 0.2-10 microns, and the carbide grains are bonded together using a metal binder. The bonding metals are generally iron group metals, commonly cobalt and nickel. Thus there are tungsten-cobalt alloys, tungsten-nickel alloys and tungsten-titanium-cobalt alloys.
Tungsten sinter forming is to press the powder into a billet, then into a sintering furnace to heat it to a certain temperature (sintering temperature) and keep it for a certain time (holding time), and then cool it down to get the tungsten steel material with the required properties.
①Tungsten and cobalt cemented carbide
The main component is tungsten carbide (WC) and binder cobalt (Co). The grade is composed of “YG” (“hard, cobalt” in Hanyu Pinyin) and the percentage of average cobalt content. For example, YG8, which means the average WCo = 8% and the rest is tungsten carbide cemented carbide.
②Tungsten, titanium and cobalt cemented carbide
The main components are tungsten carbide, titanium carbide (TiC) and cobalt. The grade is composed of “YT” (“hard, titanium” in Hanyu Pinyin) and the average content of titanium carbide. For example, YT15, means the average TiC=15%, the rest is tungsten carbide and cobalt content of tungsten titanium cobalt carbide.
③Tungsten-titanium-tantalum (niobium) carbide
The main components are tungsten carbide, titanium carbide, tantalum carbide (or niobium carbide) and cobalt. This kind of carbide is also called general-purpose carbide or universal carbide. The grade consists of “YW” (“hard” and “million” in Hanyu Pinyin) plus a sequential number, such as YW1.
Tungsten steel has a series of excellent properties such as high hardness, wear resistance, better strength and toughness, heat resistance, corrosion resistance, etc. Especially its high hardness and wear resistance remain basically unchanged even at a temperature of 500℃, and still have high hardness at 1000℃. Cemented carbide is widely used as materials, such as turning tools, milling tools, drills, boring tools, etc. The cutting speed of the new carbide is equal to hundreds of times that of carbon steel.
Post time: Feb-21-2023
