×
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

Holding time normalising of P/T 22 after welding

Holding time normalising of P/T 22 after welding

Holding time normalising of P/T 22 after welding

(OP)
We have been asked to perform mechanical tests of welded joints in P/T22 (2.25Cr 1Mo) which shall be normalised and tempered after welding.  The normalising treatment shall be done at 920-940 degree Centigrade according to requirement from our client, but how long holding time shall I choose for weld samples of 20 and 25 mm thickness respectively? I do not want to risk any grain growth.

RE: Holding time normalising of P/T 22 after welding

30mts - 35mts at the temp. is good enough for 20 and 25mm thk. weld material.

RE: Holding time normalising of P/T 22 after welding

Let us know what the results from the testing were. I was always under the impression that normalising of 2.25Cr1Mo was  bad idea - the as deposited structure is bainitic and a stress relief would produce an ideal reduced stress state. Normalising would (I think) produce a mixed microstructure with less strength.

Anyone else out there with experience of normlaising and tempering 2.25Cr1Mo welds?

RE: Holding time normalising of P/T 22 after welding

I have only done welding qualification with N&T PWHT for 1 1/4Cr-1/2Mo, and 1/2Mo.  Tensile strength is hard to meet because the carbon in the weld metal is so low.  If you had a welding consumable that was designed for N&T (i.e. matched the base metal chemistry) I don't think it would be a problem to meet the mechanical properties.  

RE: Holding time normalising of P/T 22 after welding

Our hot reheat seam welded piping that was supplied under an SA 155 material specification 40 years ago contained normalized and tempered seam welds. The main benefit derived from normalizing and tempering was to eliminate the heat affected zone. From a creep viewpoint, this is desirable. Having sub-critical PWHT welds can result in Type IV cracking along the fine grained HAZ in repair welds or in orginal fabrication welds.

RE: Holding time normalising of P/T 22 after welding

(OP)
Thanks everyone for your answers!

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