High-performance high-speed steel refers to a new type of steel that adds some carbon content, vanadium content, and alloying elements such as Co and Al to the general-purpose high-speed steel composition, thereby improving its heat resistance and wear resistance. There are mainly the following categories:

① High carbon high speed steel. High-carbon high-speed steel (such as 95W18Cr4V), with high hardness at room temperature and high temperature, is suitable for manufacturing and processing ordinary steel and cast iron, drills, reamers, taps and milling cutters with high wear resistance requirements, or tools for processing harder materials. It is not suitable to withstand large impacts.

② High vanadium high speed steel. Typical grades, such as W12Cr4V4Mo, (referred to as EV4), containing V increased to 3% to 5%, good wear resistance, suitable for cutting materials with great tool wear, such as fiber, hard rubber, plastic, etc., can also be used for processing Materials such as stainless steel, high-strength steel, and high-temperature alloys.

③ Cobalt high speed steel. It is a cobalt-containing superhard high-speed steel, a typical grade, such as W2Mo9Cr4VCo8, (M42 for short), has a high hardness, and its hardness can reach 69-70HRC. It is suitable for processing high-strength heat-resistant steel, high-temperature alloys, titanium alloys, etc. Machining material, M42 has good grindability and is suitable for making precision and complex tools, but it is not suitable for working under impact cutting conditions.

④ Aluminum high speed steel. It belongs to aluminum-containing superhard high-speed steel, typical grades, such as W6Mo5Cr4V2Al, (abbreviated as 501), the high-temperature hardness reaches 54HRC at 6000C, and the cutting performance is equivalent to M42. It is suitable for manufacturing milling cutters, drills, reamers, gear cutters, and broaches. etc., used to process materials such as alloy steel, stainless steel, high-strength steel and superalloy.

⑤ Nitrogen superhard high-speed steel. Typical grades, such as W12M03Cr4V3N, referred to as (V3N), are nitrogen-containing superhard high-speed steels. The hardness, strength, and toughness are equivalent to M42. processing.