It is the most commonly used steel for the manufacture of tooling in hot work operations and plastic molding; corresponds to a chromium-molybdenum-vanadium steel, and is characterized by:

• Good hot resistance and thermal fatigue.
• High toughness and ductility.
• Good resistance to tempering.
• Good hardenability.
• It can be cooled with water.
• Good resistance to abrasive wear, both in high and low temperature operations.
• Good dimensional stability during heat treatment.