×
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

2205 Duplex 625 Clad

2205 Duplex 625 Clad

2205 Duplex 625 Clad

(OP)
Hello all and thank you in advance for any information that you can provide.

I am going to be running a coupon in the next few days overlaying 625 inconel on duplex.

Codes:
ASME SECTION IX
NACE MR0175
ASTME562
API 6A
API 6D
DNV-OS-E101

I have done several cladding procedures in the past using P1 materials and 4130. I have not yet had to do one using a duplex. I've been doing some research and this is what I've come up with so far.

Preheat >300°F
Use 309L Butter Layer
PWHT - TIME AND TEMPERATURE UNKNOWN
625 finish layer.

I understand that using 625 directly on duplex can harm your ferrite content and I may fail bends. So a butter layer is preferable. However, I have never performed any sort of heat treatment on duplex.

Any suggestions?

RE: 2205 Duplex 625 Clad

I'm glad to hear you have never performed any sort of heat treatment on duplex! Time and temperature for any duplex SS should be 0 hours at Room Temperature.

Ferrite content in the Duplex SS HAZ is a function of 12/8 cooling time, not filler metal composition. Not sure why it would need a 309 butter layer, unless the combination of 625 and 2205 mechanical properties is somehow problematic for a bend test. Whatever you do, I advise using a wraparound bend jig.

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

RE: 2205 Duplex 625 Clad

Unless you are trying to fix the damage from the buttering pass, then you need full solution anneal and rapid quench.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: 2205 Duplex 625 Clad

There should be no PWHT on duplex stainless steel because it is impractical in your situation. A solution anneal and quench will distort the vessel during fabrication, and ruin it. What you have stated is acceptable using a butter with no preheat and limiting the maximum interpass below 350 deg F.

RE: 2205 Duplex 625 Clad

Brimstoner, just curious, what do you mean by 12/8 cooling time?

RE: 2205 Duplex 625 Clad

I believe that he is referring to temperature range.
The duplex alloys have a number of microstructural issues that need to be watched.
Solidification and initial cooling rates will impact austenite/ferrite ratio.
Time spent coming through 1800-1200F will impact formation of intermetallics (chi and sigma).
Carbides can form in the range of 1500-800F. These first two happen over a few minutes. So welds need to be below 800F is less than 90 sec, with 60 sec being better.
The range of 1000-600F is where alpha prime (885 embrittlement) will form (also leading to increased hardness and reduced toughness). This typically takes 10 min or more to form.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

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