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Material: S-2 (Mod #4)

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SMetcalf

Mechanical
Joined
Mar 7, 2022
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What is the material type S-2 Mod #4?
I know that S-2 is a Shock Steel, but can't find information for what Mod #4 means.

Thank you!
 
Something related to modification in alloy composition? Hardening specification/method? I am guessing though. Search in ASTM A681 doesn't tell anything.

Perhaps the context of specification and/or application of material use may give you the hint required.
 
It is a shock resistant tool steel which has S-2 and S-4 grades. My guess is that it is a proprietary modification ( which may be a minor change).
 
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