×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

SS316L, AL6XN, or Aluminum in Chloride Atmosphere
3

SS316L, AL6XN, or Aluminum in Chloride Atmosphere

SS316L, AL6XN, or Aluminum in Chloride Atmosphere

(OP)
We need to replace vent on large steel tank used for chlorination and water storage (2 mg/l Cl).  About 6 months ago, we installed vent made of bare SS304 and it already shows significant corrosion (rust and pitting).  We want to avoid paint finishes.  We are considering SS316L, AL6XN, or Aluminum.  How should we decide?  A 12-month field test is not OK. Thanks in advance

RE: SS316L, AL6XN, or Aluminum in Chloride Atmosphere

It's unlikely that 316 would work if 304 did that badly. You should be considering at least the alloy level of 2205.
Al6XN is better, but quite expensive. 29-4C would be another alternative. Aluminum would fail quicker than 304.

RE: SS316L, AL6XN, or Aluminum in Chloride Atmosphere

2205 sounds like a good option.
Don't use AL29-4C or Sea-Cure (superferritics) if there will be much field welding or if you need structural strength.  They are both only available in light gages.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

RE: SS316L, AL6XN, or Aluminum in Chloride Atmosphere

EdStainless is quite right about those superferritics. I should have included Seacure, which is every bit as good as 29-4C.
Along the same lines, 2507 is one more step up from 2205, but not as available, I think. EdStainless would know better than I since he's still in the game.

RE: SS316L, AL6XN, or Aluminum in Chloride Atmosphere

An obvious application for a fiberglass tank, no reason to sweat the various metallics

RE: SS316L, AL6XN, or Aluminum in Chloride Atmosphere

As an alternate to the materials, I would look at 904L SS for the vent.  

RE: SS316L, AL6XN, or Aluminum in Chloride Atmosphere

With todays Ni and Mo prices I have to agree with Joe and suggest that composite is a good option.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

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!


Resources