High-speed steel (HSS or HS) is a subset of tool steels, commonly used as cutting tool material.It is often used in power-saw blades and drill bits. It is superior to the older high-carbon steel tools used extensively through the 1940s in that it can withstand higher temperatures without losing its temper (hardness). This property allows HSS to cut faster than high carbon steel, hence the name high-speed steel. At room temperature, in their generally recommended heat treatment, HSS grades generally display high hardness (above Rockwell hardness 60) and abrasion resistance (generally linked to tungsten and vanadium content often used in HSS) compared with common carbon and tool steels.

The properties of high-speed steel make it well-suited for a variety of applications. It has excellent heat and wear resistance due to its high hardness level compared to other tool steels. This means that it will maintain its cutting edge even under heavy use or when exposed to extreme temperatures. Additionally, HSS also has good shock resistance, which helps prevent chipping or breakage during use. Finally, HSS has a low coefficient of friction which means that it can cut more efficiently than other cutting materials.

1，HSS is an abbreviation for high-speed steel.
2，HSS is a type of steel that is used in cutting tools and is known for its high hardness and abrasion resistance.
3，HSS is made by adding tungsten, molybdenum, or vanadium to carbon steel, which increases the hardness and wears resistance of the steel.
4，HSS is often used in end mills, drill bits, taps, and reamers as it can withstand higher cutting speeds than standard carbon steels.
5，HSS is available in a variety of grades, each with different properties, depending on the application.

High-speed steel can be used in a wide range of applications, including machining operations such as boring or drilling metal pieces; sawing through tough materials like stainless steel; cutting intricate shapes with precision; milling difficult materials like hardened steel; producing strong thread forms on metal components; grinding hard surfaces; making smooth finishes on metal surfaces; punching holes through metal sheets; sharpening blades quickly without wearing down the material too much; cold forming sheet metal into complex shapes; creating dies for forging metals into desired shapes; pressing metal parts together quickly without damaging them; thread rolling with extreme accuracy; and welding metals together with precision.

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