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AISI 430

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PeterCharles

Mechanical
Joined
Oct 31, 2002
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According to information I have, and more that I found on the web, AISI 430 is a ferritic stainless steel that "does not respond to hardening by heat treatment".

But I've been passed a supplier specification that states, "Material - AISI 430, heat treated".

Do they now something I don't?
Anyone any extra knowledge to share?
 
Well, they did not say "hardened by heat treatment" which cannot be done.
Heat treatments like annealing, stress relieving etc. are possible in the production process.

 
Goahead, your're right they didn't say "hardened".

However, the part specified is a connecting pin for a forged link chain which would normally be a case hardened alloy steel, so I assumed(*) they meant "hardened"!

A sample pin now in my possession I've checked at Rc42 which seems a bit hard for 430. Maybe a chemical analysis is called for to clarify.

*
ASSUME
makes an ASS of U and ME
 
Is it possible that there has been a typo? Perhaps 4130, heat treated?

Regards,

Cory

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As CoryPad noted, 4130 at HRC 42 would make sense. Also, 431 is a hardenable stainless, rather close to "430" in name, for which HRC 42 is reasonable.

But 430 at HRC 42? That just ain't right...
 
CoryPad
Don't think its 4130. The pin I've got has been in service and is clearly corrosion resistant.

lgearhart
431 is a possibility. One reference I've found for 431 states "...capable of being through hardened up to Rc44".

Really, only a chemical analysis will establish what I've got.

Was it a typo? Well who knows, but the sample link that came with the pin doesn't conform to the written specification so anything is possible!!

Thanks for the comments.
 
There are really three variation of 430 available. All of them meet the same spec.
The low C version is a ferritic.
The high C is a 'weak' martensitic. It will harden with Q&T.
In the mid range you get some martensite forming, but there is so little C that it isn't very hard.

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