UNS S31803 vs. S32205

[billbirk]

Is there an optimal solution annealing temperature for dual certified 2205 (UNS S31803/S32205) to achieve the 5 ksi higher strength requirements of S32205 found in ASTM A789 and A815? Several datasheets found on-line indicate that a company's S31803 grade has a typical chemistry that mimics the more restrictive S32205, however they refer to the lower mechanical values of the S31803 grade.

 

[EdStainless]

All S32205 is S38013, but not the other way around.
It isn't an annealing trick. If you are running the restricted 2205 chemistry you will get the strength.
(And by the way the common term 2205 is S32205.)
The spec strengths are minimums. In reality everone is getting higher strengths.

In some cases for Code applications you will need dual certified, since only S30813 is listed in some places. Soon S32205 will be everywhere in the Code and dual cert won't be needed.

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[billbirk]

Within the range of 1870-2010°F, strength is unaffected by annealing at one end of the range versus the other? Or, would one expect higher strengths and lower ductility by annealing closer to 2010°F and producing a structure with a higher percentage of ferrite?

 

[mcguire]

This all depends on heat chemistry. See what your nitrogen levels are. If they are above 0.15% you will achieve S32205 results.

Michael McGuire

http://stainlesssteelforengineers.blogspot.com/

 

[EdStainless]

You won't see much variation in mechanical properties. I have run material at 1875F and at 1950F. It does shift the F/A ratio some, but not enought to really change things.
You could get wild results if you blow the grain size up too much, or if you have trouble with cooling rates.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

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[billbirk]

With respect to grain size: 1) Is there a threshold grain size that is correlated to passing mechanical properties? And, 2) What is the proper etchant to reveal the 2205 grain size?