×
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

4130 stress relief

4130 stress relief

4130 stress relief

(OP)
Welding on 4130.

How do I know the necessity of stress relief?  

RE: 4130 stress relief

A little more information please. You will get some hardening adjacent to the weld so a lot depends of the physical parameters. More information is needed as 4130 is welded everyday without any stress relief or PWHT.

What is the weld metal?

what is the part for?

How large is the part?

Was the original part heat treated?
 

RE: 4130 stress relief

(OP)
The weld metal is inconel 625 for a corrosion-resistant overlay. Here, all part is treated. But, It has some code that requests stress relief? ´cause this material it´s not listed in ASME.


 

RE: 4130 stress relief

Depending on the code there may be PWHT requirements for certain materials or PWHT requirements based on yield strength and plate thickness combo.

Usually PWHT forces itself (code, or no code requirement) when your required to qualify a welding procedure. If that is the case you need to determine the hardness requirements, ie sour service requirement and calculate expected hardness based on welding method, heat input, preheat, thickness and carbon equivalent. Having determined that PWHT is indeed neccesary for 4130, the soak temperature should be set at 25 deg C below the original tempering temperature for quenched and tempered steel or if its not a QT steel, 125 deg C below A1. Soaking time should be 2min/mm and heating rate should be max 200 degC/h, cooling rate should be max 100 degC/h.

In my experience with inco 625 cladding of 4130 forgings for subsea installations PWHT has always been neccesary. Engineering almost always modified the material spec and forging to a higher strength makes it more difficult to meet the PQR requirements

RE: 4130 stress relief

(OP)
Unclesyd, Tmoose and Vestveit,

Thank you the attention,

New questions will appear.


Regards,

Clayton da Silva

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