[TheForge] A8

[Dave Brown]

At 09:18 05/23/04, you wrote:

>Just got access to a fair amount of A8 tool steel, from used wood chipper
>blades. Is it good for anything? Anybody want some?
>
>Please, tell me about it...
>
>Saint Phlip,
>CoDoLDS
  From Timkin.com:  "A8 tool steel is an air-hardening tool steel that is 
characterized by a combination of very good toughness, intermediate wear 
resistance, and excellent dimensional stability in heat treatment. A8 is an 
excellent steel for punches and dies that operate in the 55 to 60 Rockwell 
C hardness range. The combination of toughness and wear resistance make A8 
an excellent tool for applications which require higher toughness than that 
of the high-carbon, high-chromium steels such as D2, and better wear 
resistance than that of shock-resisting steels such as S7. For hot work 
tooling applications, A8 provides better resistance to erosion, wear and 
wash-out than the typical chromium-molybdenum hot work steels such as H11 
and H13. However, it is not recommended for hot applications where thermal 
fatigue (heat checking) is the primary failure mode."

"Typical applications for A8 tool steel include punches, drift pins, 
pneumatic tools, chuck jaws, hammers, hot rolls, and hot and cold shear 
knives."

"MGR A8 is manufactured by Timken Latrobe Steel in Latrobe, Pennsylvania 
using computer-controlled AOD refining, bottom-pouring ingot technology, 
and computer-controlled open die and rotary forging presses. These 
processing parameters produce optimal metallurgical quality and consistency 
in a conventional ingot-cast tool steel. "

"ASTM A8 is available from Timken Latrobe Steel Distribution. It is 
produced by the world's leading steel manufacturers in sizes and product 
forms that are not readily available from Latrobe, Pennsylvania.

Dave Brown
Heritage Smithing
Green Bay, WI

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