×
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

SS linings and PWHT

SS linings and PWHT

SS linings and PWHT

(OP)
ASME VIII 6.5.5.2 requires all vessels with SS linings to have PWHT why?
And why do 405 and 410S linings not require PWHT?

RE: SS linings and PWHT

If you review ASME Section VIII, Div 2 the reference you cited below is for 4XX martensitic stainless steel which is hardenable, thus PWHT is necessary. The Type 405 or 410S are ferritic stainless steel which are not hardenable by heat treatment.

6.5.5.2 Requirements When Base Metal or Lining Is Chromium Alloy Steel. Vessels or parts of vessels constructed
of chromium alloy stainless steel clad base material and those lined with chromium alloy stainless steel applied linings
shall be postweld heat treated in all thicknesses, except that vessels clad or lined with Type 405 or Type 410S and
welded with an austenitic electrode or non-air-hardening nickel-chromium-iron electrode need not be postweld heat
treated unless required by 6.5.5.1.

RE: SS linings and PWHT

Like metengr says. Please don't mistake this to mean all stainless cladding besides 405 and 410 need PWHT. You'll really muck up the corrosion resistance of a lot of austenitic stainless steel with PWHT.

Nathan Brink

RE: SS linings and PWHT

You'll not just muck up the corrosion resistance- if you do it wrong, you'll destroy the cladding entirely.

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