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

Corrosion in Stainless Steel from Wastewater

Corrosion in Stainless Steel from Wastewater

Corrosion in Stainless Steel from Wastewater

We have a client who has contacted us about some corrosion his clients are experiencing.  They manufacturing stainless steel products for the wastewater industry and have ran into a recent corrosion problem.

Piping and elbows are SA312-304 S.S.
Other "heavy" stainless is SA240-304 and SA240-304L

Chemical is wastewater:  some aerobic and some anaerobic, pH is low; temperature is ambient, no pressure or vacuum present

Tank and piping is 4 years old.  Some places have seen corrosion bad enough to put two fingers through the hole, others have bad pitting, some the elbow is fine and the pipe threads are gone, some the pipe is ok and the elbow is destroyed.

Have thought about lack of oxygen contributing to this and would like some of the forums expert opinions on this.

Thanks in advance.


RE: Corrosion in Stainless Steel from Wastewater

I take from you post tht the piping is threaded.  The problem is probally do to the fact the Crevice corrosion is a problem with TP 304 stainless steel in many aqueous environments. Changing to a butt welded system might solve some of the problems.  In addition, it might behoove them to change the material to a low carbon grade, type 304L.

PH is Low? what is the PH? What are the chemicals used in the processing of the waste water? In many cases the trace chemicals are causing the corrosion.

Get a PI&D of the process and start working your way through it. Mark where to corrosion is occuring then look immediately upstream.

Let us know what you find.


RE: Corrosion in Stainless Steel from Wastewater


Thanks for the quick reply.  I am meeting with the client tomorrow and will keep you informed of the "progress" and findings.


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