M3 high-speed tool steel contains carbon and vanadium levels that are intermediate between those of M2 and M4. This gives the steel a fine balance of wear-resistance and grindability, and provides superior resistance to abrasion and edge breakdown. This makes M3 high-speed steel a superb tool material for form tools and roll turning for severe cutting operations. An increase in tool life will also be experienced in the machining of heat-treated sections, castings and similar hard materials.
Other Known Names: REX M3-1®, PM M3, Corsair
Griggs Steel Color Code:Blue
Broaches, Blades, Form Tools, and Reamers
0.295 lb/in3 (8166 kg/m3)
Modulus Of Elasticity
30 x 106 psi (207 GPa)
37-42% of a 1% carbon steel
High Speed Steel Properties Comparison
M3 High Speed Steel Chemical Composition
M3 High Speed Steel Heat Treating
PM M3, M3 High Speed Steel Thermal Treatments
- Furnace: 2200-2250°F (1204-1232°C)
- Salt: 2175-2225°F (1191-1218°C)
Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1550-1600°F (843-871°C), and hold at temperature for 1 hour per inch (25.4 mm) of thickness, 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 50°F per hour (28°C per hour) to 1000°F (538°C). Continue cooling to ambient temperature in the furnace or in air.