AISI 430

[PeterCharles]

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?

 

[Goahead]

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.

http://www.welding-advisers.com/

 

[PeterCharles]

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

 

[CoryPad]

Is it possible that there has been a typo? Perhaps 4130, heat treated?

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[lgearhart]

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...

 

[PeterCharles]

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.

 

[EdStainless]

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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