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AISI S-7 Shock Resistant Air – Hardening Tool Steel

Shock resisting tool steels are listed under the letter symbol "S". These tool steels are intended for applications requiring high toughness and resistance to shock loading. Our S – 7 grade is commonly used for moderately elevated temperature service. Repeated shock loads are no problem for the S -7 grade due to its exceptional strength and overall toughness. 

Typical applications include:

-  Chipping chisels   
-  Knock out pins  
-  Screw driver blades
-  Circular pipe cutters   
-  Mandrels   
-  Shear blades
-  Drift pins    
-  Punches   
-  Stamps
-  Grippers    
-  Rivet sets   
-  Track tools
-  Hand chisels


The chemical composition of our grade S - 7 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:

Very Slowly   

Preheat Temperature:

1,500 F (816) C

Hardening Temperature:

1,800 – 1,875 F (982 – 1024) C

Time at Temperature: 

15 - 45

Quenching Medium: 

Air

Tempering

Tempering Temperature:

400 – 1,000 F   (204 – 538) C

Approximate Tempered Hardness:

HRC     54 - 61

Attributes

WEAR RESISTANCE

HIGH TO VERY HIGH

TOUGHNESS 

LOW

RESISTANCE TO SOFTENING

MEDIUM TO HIGH

DEPTH OF HARDENING

DEEP

MACHINABILITY

LOW

GRINDABILITY

LOW

DISTORTION IN HEAT-TREATING

LOWEST

RESISTANCE TO CRACKING

HIGHEST

RESISTANCE TO DECARBURIZATION

MEDUIM



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

   

 
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