×
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

ammonia-steel

ammonia-steel

ammonia-steel

(OP)
I'm looking for some values for corrosion rate of ammonia in contact with some stainless steels 304-(L),316-(L).
And carbon steel, I've looking very hard but I could't find anything just for 316 and carbon steel 1020.
Thanks in advance.  

RE: ammonia-steel

(OP)
Thanks micalbrch¡¡¡¡¡¡ it was useful, and thanks for answering so quickly¡¡¡ :D

RE: ammonia-steel

arceki, is this application for urea service?  

RE: ammonia-steel

Unless you are at extreme temperature, pressures, and concentrations; any SS will have a near zero corrosion rate.
We have supplied high alloy SS grades for use in ammonia heat exchangers cooled with seawater.

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

RE: ammonia-steel

(OP)
Ok thank you all.

RE: ammonia-steel

have a look at this paper from NIDI, you can download it for free, just register to the site:

Stainless Steels in Ammonia Production (9013)

Discusses selection of stainless steels from process equipment in ammonia production plants. Contains 22 diagrams, charts, and tables illustrating a typical ammonia production process, and provides technical data on 18 stainless steels that might be used for construction materials. Also covers materials for desulphurization, catalytic steam reforming, carbon monoxide shift, carbon dioxide removal, methanation, synthesis, and turbine-driven centrifugal compression trains. Provides data on the candidate stainless steels.
http://www.nickelinstitute.org/index.cfm/ci_id/15786/la_id/1/ci_doc_id/3135/st_id/13/level/3.html


hope this help

S

Corrosion & Rust Prevention Control
 

RE: ammonia-steel

In addition to above valuable references, please find below if you need more information.

- MTI, Materials Selector for for Hazardous Chemicals, MS-6: Ammonia and Caustic Soda
- NACE Conference Paper 03523 Stress Corrosion Cracking of Austenitic Stainless Steel in Fertilizer Plants
- NACE Conference Paper 02439 External SCC Phenomena of Austenitic Stainless Steel in Urea Plants

Thomas Eun

RE: ammonia-steel

Carbon steels in anhydrous ammonia service can suffer from stress corrosion cracking if the water content is less than about 0.1%, with the presence of oxygen (also small ppm).

There is some good information available from European Fertiliser Manufacturers Association (EFMA) about this.

I've seen many production plants use low/medium strength plate and weld materials (~300 MPa yield), with PWHT included.  

Vapour spaces of vessels are also at risk of SCC, due to the water content of the vapour being 0%.  

Risk of SCC increases with increasing temperature, oxygen content and hardness.

Finally, general corrosion/thinning is not a mechanism usually considered for carbon steel in anhydrous ammonia service, but is probably a consideration for aqueous ammonia.


 

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