High Speed Steel is superior high-carbon,high alloy tool steel.

It is often used in power-saw blades， high speed cutter, gear & bearing cutters, router bits , drill bits, etc.  High speed steel have 3 type.  

• Tungsten High Speed Steels 

Tungsten high speed steel is the most used high speed steel, The Tungsten composition higher than 11%. it has good comprehensive performance, have high hardness (HRC 62 ~ 66), strength, toughness and heat resistance, red hardness can reach 620 degrees Celsius.  Like American Steel standrad AISI/ASTM/SAE  T1~T15 high speed steel,  The commonly used Tungsten hss have T1, T2, T4, T5, T15 High Speed Steel. Germany DIN S 18-0-1 /W-Nr 1.3355; Jis SKH2, SKH3,SKH4, SKH5,SKH10 High speed tool steel; China GB W18Cr4V, W12Cr4V5Co5, Etc.

• Molybdenum High Speed Steels (HSS)

The Molybdenum high speed tool steel have adding high comoposition molybdenum, the Mo higher than 4.5%,  commonly called “HSS”, The heat treamt hardness can reached 63-65 Rockwell hardness. aisi Grade M1 to M62.

• Middle type High Speed Steel

The Middle type high speed steel’s alloy composition lower than standard HSS. Typical Grade M50, M52.