Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

S32205 vs S31803

S32205 vs S31803

S32205 vs S31803

Hi everybody,

on a project, I have to choose the most suitable steel which won't suffer from Atmospheric Stress Corrosion Cracking.
Someone suggested me to use S32205 or S31803. Both are 2205.

i don't really see the difference, besides their chemical composition.
I cannot find some comparitive study and most of their mechanical parameters are almost the same.

Does anyone knowing these grades would accept to advise me?

Thank you in advance.

RE: S32205 vs S31803

Refer to API TR 938 C. It's a very useful guide for use of DSS's. The introduction of that standard says, wrt 31803 and 32205;


Note that UNS S32205 is a “newer version” of UNS S31803 and is produced with higher nitrogen,
chromium, and molybdenum contents. ASME and ASTM standards for these grades are given in Table 2, while Table
3 provides the mechanical properties. Type 316L and other austenitic SS are included for comparison.

From a recent project, we've used 32205 and 31803 as 'dual certified', as long as a certain amount of nitrogen is present (N > 0.14%).
I believe this rerquirement came straight out of API TR 938 C (it also mentions 32205 and 31803 can be used as dual certified).

Go ahead on the webs, Im sure you will manage to get a copy of API TR 938 C.

RE: S32205 vs S31803

Thank you for the answer.
But I have been looking on the internet.

The only way to get the copy of API TR 938 C is to pay and for what I need, I am not sure it would worth it.

RE: S32205 vs S31803

That's up to you to decide.
$125 USD for a good technical report which may help
you on some fundamental and important decisions (maybe) to be made ...

RE: S32205 vs S31803

What had evolved is that the 'better' mills were all making 2205 under S31803 and working to the high side of the chemistry range.
The alloy was more stable, had higher strength, and measurably better corrosion resistance than a more generic version of the chemistry.
They got a new UNS number reflecting the chemistry restrictions and have been adding it to specifications.
The safest route is to have it dual certified, this way if there is an older spec that only calls out S31803 you are still covered but you get the chemistry and properties of S32205.
If this material is more than a few mm thick you should also require A923 to assure that it was annealed correctly.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: S32205 vs S31803

Ok! Thank you for the info!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close