×
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

HIC and SCC tests could they be done on stainless steel?

HIC and SCC tests could they be done on stainless steel?

HIC and SCC tests could they be done on stainless steel?

(OP)
In order to prevent H2S corrosion of flare tip material it has been decided to use stainless steel material.  The owner insists on HIC an SCC testing of stainless steel, is this done at any mills?

RE: HIC and SCC tests could they be done on stainless steel?

HIC?
SCC is obviously stress corrosion cracking.

RE: HIC and SCC tests could they be done on stainless steel?

HIC (Hydrogen induced Cracking) occurs in carbon steel when you have wet H2S, that is, H2S and H2O.

Hydrogen is produced due to the corrosion reaction and permeates into the steel. There's a lot of information out there describing this process.

Stainless steel will not be afected by wet H2S; therefore, there won't be any HIC.

Check API 571, NACE MR0175 and/or NACE MR0103.

RE: HIC and SCC tests could they be done on stainless steel?

Flare tips are usually stainless steel or nickel alloys anyway.  If there is H2S around, then strong consideration should be given to using 310 stainless steel.  HIC is not an issue in these materials and it seems the end user is very confused!  ISO 15156-3 or NACE MR0103, dependent upon the type of plant, will give materials requirements that, if complied with, remove the need to perform SSC testing.  The end user also needs to recall that SSC will only be an issue if liquid water is present at the exposed surface of the material.  Ask him to think about the temperature of the flare tip and the boiling point of water!

Steve Jones
Materials & Corrosion Engineer
http://www.oilandgaspeople.com/cv/11499664
http://www.linkedin.com/pub/8/83b/b04
 

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