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AISI A-2 Multipurpose Air - Hardening Tool Steel

The cold work tool steel listed under the letter symbol "A" cover a wide range of carbon and alloy contents, but all have high hardening and exhibit a high degree of dimensional stability in heat treatment. Our A-2 multipurpose tool steel is a superior quality of steel reflecting a very fine grain structure. It is electric furnace air-hardening, 5% chrome tool steel. It maintains excellent wear and abrasion resistance properties. These qualities permit the steel to hold extremely sharp cutting edges particularly as compared to O-1. Our A-2 grade of tool steel maintains exceptional machinability characteristics when compared to other high carbon / high chromium steels, like D -2. It is one of our most popular grades of tool steel and is ideal for use particularly in thin applications.


Typical applications include:
-  Blanking dies
-  Knurls    
-  Rolls
-  Brick and mold Liners 
-  Mandrels   
-  Sand Slingers
-  Coining dies   
-  Master hobs   
-  Shear knives
-  Cold forming tools  
-  Molds    
-  Slitter knives
-  Forming dies       
-  Spindles


The chemical composition our grade A - 2 ground flat stock falls within ranges that are rigidly monitored. These chemical ranges are shown below *




Precision Ground Tolerances 

Thickness:

+/-.001" 

Width - Up to 8":

-.000/+.005"

Width - 9" and Over:

-.000/+.015"

Square: 

+/-.001"

Length - 18":

Length - 24":

Length - 36":

Squareness (All Edges):

+1/4"

+1/2"

+5/8"

.003" per Inch


Hardening

Rate of Heating:

Slowly  

Preheat Temperature:

1,450 F (788) C

Hardening Temperature:

1,700 – 1,800 F   (927 – 982) C

Time at Temperature: 

Minutes 20-45

Quenching Medium: 

Air

Tempering

Tempering Temperature:

350 – 1,000 F      (177 – 538) C

Approximate Tempered Hardness:

HRC     57 - 62

Attributes

WEAR RESISTANCE

HIGH

TOUGHNESS 

MEDIUM

RESISTANCE TO SOFTENING

MEDIUM TO HIGH

DEPTH OF HARDENING

DEEP

MACHINABILITY

MEDIUM

GRINDABILITY

MEDIUM

DISTORTION IN HEAT-TREATING

LOWEST

RESISTANCE TO CRACKING

HIGHEST

RESISTANCE TO DECARBURIZATION

MEDUIM


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

 

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