What are grades of high speed steel?

There are different grades of high-speed steel. Some of the most common grades include:

M1: This steel has a high carbon content and is good for cutting tools and drills.

M2: This steel is a popular option for drills, milling cutters, and taps. It contains tungsten, molybdenum, and vanadium for improved wear resistance.

M3: This steel is similar to M2, but has a higher content of cobalt for improved toughness and heat resistance.

M4: This is a high-performance steel that contains more tungsten and vanadium for increased wear resistance and toughness.

T15: This steel contains a high amount of cobalt and is used in high-speed cutting tools for harder materials.

M42: This steel contains a high amount of cobalt and is used for saw blades, drills, and other cutting tools that require high heat resistance and toughness.