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AISI M2 Features & Benefits

AISI M2 Tool steel is a molybdenum based high-speed steel in tungsten. The chemical composition of M2 gives a good combination of well-balanced toughness, red hardness properties and wear resistance. AISI M2 is most recommended and most used in the manufacturing of tools for cutting, continuous, or intermittent cutting conditions.

AISI M2 Characteristics & Applications

AISI M2 is commonly used in drills, taps, end mills and more. It’s commonly used for cutting and cold forming dies and punches, in which tools can be used with low hardness. AISI M2 is commonly heat treated. Common applications of AISI M2 include:

  • Twist drills
  • Taps
  • Milling tools
  • Extrusion rams and dies
  • Cutting tools
  • Knives

AISI M2
Characteristics Molybdenum-type high speed steel with excellent toughness and cutting properties; Used for a wide variety of uses and applications
Applications Punches, dies, taps, twist drills, reamers, broaching tools, metal saws, milling tools, cold work tools

AISI M2
Typical Analysis % C
0.85 / 0.90
Si
0.25
Mn
4.10
Cr
5.00
Mo
1.90
V
6.40
Standard Specification ~AISI M2, DIN/EN 1.3343
Color Code Gold / Green

AISI M2 HEAT TREATMENT
SOFT ANNEALING:
  • 1420 to 1545°F (770 to 840°C), controlled slow cooling in furnace at 20 to 35°F / hr. (10 to 20°C / hr.) to approximately 1110°F (600°C), followed by cooling in still air
  • Hardness after annealing 280 Brinell (maximum)
STRESS RELIEVING:
  • To relieve stresses created by extensive machining or tooling with complex geometries, heat in a neutral atmosphere for 1 to 2 hours after reaching a temperature of 1110 to 1200°F (600 to 650°C), followed by slow cooling in the furnace
HARDENING:
  • Hardening temperature of 1920 to 2245°F (1190 to 1230°C)
  • Quench in: oil, salt bath at 930 to 1020°F (500 to 550°C), or vacuum
  • The upper temperature range should be used for parts of simple geometry (lower range for more complex tooling)
  • For cold work tooling, lower temperatures are important for improved toughness
  • Preheat in multiple steps and equalize surface and core temperatures
  • For example, Step 1: 1020°F (550°C), Step 2: 1560°F (850°C); Step 3: 1920°F (1050°C); Step 4: Appropriate hardening temperature
  • Third preheat is only required for complex geometries
TEMPERING:
  • Slowly and uniformly heat to the appropriate tempering temperature immediately after the hardening operation
  • Once the temperature of the tool has been equalized, a soaking period of one hour per inch (25 mm) of workpiece thickness is required (but not less than 2 hours)
  • First and second tempers should be used to reach the desired hardness level, and the third selected for additional stress relief at 85 - 120°F (30 to 50°C) below the highest tempering temperature
  • Intermittent cooling, in air, between tempers is required for a minimum of 1 hour
  • Obtainable hardness of 64 to 66 HRC
SURFACE TREATMENT:
  • Nitriding: Parts made from this steel may be nitrided via the plasma, gas or salt bath processes

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