AISI M 2 Very Hard High Speed Tool Steel

The high speed steels listed under the letter symbol "M" generally are considered to have molybdenum as the principle alloying element with equal or slightly greater amounts of tungsten.  Its high molybdenium content significantly increases the products' hardness. While our M -2 tool steel product is extremely hard it also resists softening. Cutting edges made with our M -2 product will remain sharp even at elevated temperatures. If your application requires high speed cutting operations, M -2 is an ideal choice.

Typical applications include:

-  Broaches    
-  Hobs   
-  Reamers
-  Chasers   
-  Lathe tools  
-  Routers
-  Drills    
-  Milling cutters  
-  Saws
-  End mills   
-  Planter tools  
-  Taps
-  Punches  
-  Woodworking tools

The chemical composition of the D. B. & S Steel grade M - 2 ground flat stock falls within ranges that are rigidly monitored. These chemical ranges are shown below *


Hardening

Rate of Heating:

Rapidly from Preheat  

Preheat Temperature:

1,350  - 1,550 F   (732 - 843) C

Hardening Temperature:

2,175 2,250 F  (1,191 1,232) C

Time at Temperature

Minutes 2-5

Quenching Medium: 

Air, Oil, or Salt Bath

Tempering

Tempering Temperature:

1,000 1,100 F  (538 - 593)C

Approximate Tempered Hardness:

HRC     60 - 65

Attributes

WEAR RESISTANCE

VERY HIGH

TOUGHNESS 

LOW

RESISTANCE TO SOFTENING

VERY HIGH

DEPTH OF HARDENING

DEEP

MACHINABILITY

MEDIUM

GRINDABILITY

LOW

DISTORTION IN HEAT-TREATING

AIR OR SALT BATH -  LOW   OIL - MEDIUM

RESISTANCE TO CRACKING

MEDIUM

RESISTANCE TO DECARBURIZATION

MEDUIM


*Source: Steel Products Manual "TOOL STEELS" a publication of the Iron and Steel Society  - June 2000