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:
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?
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
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
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P.E. Metallurgy, Plymouth Tube
RE: 2205 Duplex 625 Clad
RE: 2205 Duplex 625 Clad
RE: 2205 Duplex 625 Clad
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.
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P.E. Metallurgy, Plymouth Tube