Welding UNS S31254 to UNS S31254

[prabhu]

Dear All,

Can you guide me for selecting TIG filler wire for SMO 254  UNS S31254  to  UNS S31254 plate thickness 10mm

and in preparing WPS for same with parameters inputs.

[surya desai]

Dear Prabhu

It is super austenitic stainless steel grade so you can use ERNiCrMo-3 Wire with GTAW Process.

 

Regards

Suryakant Desai

 

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[Amitabha.B...@voestalpine.com]

Resending..

 

With Regards

Amitabha Bhattacharya

voestalpine Bohler Welding India Pvt. Ltd.

voestalpine Bohler Application Technology Centre

M. +91-98 33998246

www.voestalpine.com/welding

 

From: Bhattacharya Amitabha
Sent: Friday, November 15, 2013 4:09 PM
To: 'material...@googlegroups.com'
Subject: RE: [MW:19280] Welding UNS S31254 to UNS S31254

 

Hello, Prabhu,

 

You may use GTAW wire Avesta P54 for this joining. Please review the attached PDS for Welding parameters & Shielding gas requirement. Fully austenitic plates & filler  needs low heat input to avoid hot cracking which please note. Also take care for joint design as well.

 

Thanks

 

With Regards

Amitabha Bhattacharya

voestalpine Bohler Welding India Pvt. Ltd.

voestalpine Bohler Application Technology Centre

M. +91-98 33998246

www.voestalpine.com/welding

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[pgoswami]

Hi Mr. Prabhu,

 

UNS 31254 is a very common and popular material for offshore oil and gas production environments. On the same not it's specified for corrosive environments in chemical/petrochemical  environments also. Offshore oil and gas specifications have very specific requirements for this alloy (see attached). Though copyrighted, this standard  is a free download from the web.

The major issue with this alloy is "segregation of Mo" while  welding thicker sections, this could severely impair "corrosion resistance".

 

What're the design environments in your case  ???

 

Further  to the information provided by Mr. Bhattacharya, please see the following link below, for comprehensive guideline on welding consumable selection for 6Mo alloy,UNS S31254. Usually the choices are as follows:-

• C-276, and C-22- More "Mo" than alloy 625 filler, hence more expensive. Good recommendation for thicker sections e.g 3/4"and above
• Filler for alloy 625- Most commonly used.Under most offshore and other industrial environments  625 filler is considered to be the  "safest" choice.

• Filler metals , e.g Avesta P-54, matching the 6Mo chemistry  is the least expensive as compared to the previously mentioned alloys. Due to "Mo" segregation meeting ASTM G48A pitting corrosion test could be a suspect. For welding thicker sections (3/4" and above) solution anneal of the may be advisable following welding

By and large based on design and  corrosion testing requirements  and the thickness involved (10 mm) a toss between 625 and Avesta P-54 would be appropriate. GTAW would be the preferred welding process.

 

Thanks

 

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgos...@quickclic.net

pgos...@sympatico.ca

 

http://www.nickelinstitute.org/en/TechnicalLiterature/Technical%20Series/PracticalGuideToUsing6MoAusteniticStainlessSteel_10032_.aspx

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Amitabha.B...@voestalpine.com
Sent: Friday, November 15, 2013 6:57 AM
To: material...@googlegroups.com
Subject: FW: [MW:19282] Welding UNS S31254 to UNS S31254

[prabhu]

Dear All,

ER NiCrMo-3 result are dood for lower thickness but for higher thickness i am getting problem. I am welding 10-16 mm thick plates please guide welding parameters for the same.

[Vairamuthu Ramar]

 
 
 
Could you please explain in detail what type of problem you are facing?
 


 

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Date: Thu, 16 Jan 2014 19:55:45 -0800
From: prabhuj...@gmail.com
To: material...@googlegroups.com
Subject: [MW:19876] Re: Welding UNS S31254 to UNS S31254

[pgoswami]

Hi Prabhu,

625 Filler contains fairly high percentage of "Nb"(please see below)

The presence of Nb causes problems that may place restrictions on the weld procedures. Nitrogen can diffuse rapidly from the 6%Mo HAZ to the weld metal and result in the formation of niobium nitrides at the weld deposit & fusion boundary, leading to some loss of ductility and corrosion resistance.

If the failures are in side bends test, then Nb  in weld metal  should be restricted to minimum or Nil content.

It would be good to know what's the real problem.

Thanks

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgos...@quickclic.net

pgos...@sympatico.ca

 

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From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of prabhu
Sent: Thursday, January 16, 2014 10:56 PM
To: material...@googlegroups.com
Subject: [MW:19876] Re: Welding UNS S31254 to UNS S31254

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[Kamal Shah]

Dear Mr.Prabhu,

Selection of welding consumables, joint geometry and gas mixture for welding of 254 SMO material depend on various factors.

GTAW may be carried out with ER Ni Cr Mo-3, however niobium free alternative filler metal ER Ni Cr Mo-20       (Nb <0.2) is advisable. It gives a weld metal that is completely free from secondary precipitates. Niobium increases the tendency towards secondary precipitates. In turn, this can lead to hot cracking in the weld metal, however, in environments with high working temperature , ER NiCrMo-3 is a better option because the higher niobium content gives superior structure stability. The ductility of GTAW metals is extremely high.

Welding of, thicker sections of 254 SMO can be carried out by using ER Ni Cr Mo-13, this gives less crack prone weld metal than ER Ni Cr Mo-3 / ER Ni Cr Mo-20.

If the application is for D Stage filter in the CIO₂ bleaching of pulp, here the combination of high temperature, high chlorine levels and an almost neutral pH results in very aggressive environment. Here Nickel based alloys are vulnerable to transpassive corrosion, hence a specially developed iron-based filler metal like P54 is recommended. P54 should not be seen as a replacement for ER-NiCrMo-3 or ER NiCrMo-20, but as a complement for use in extremely demanding environment.

The recommended joint design are as follows.

The shielding gas used should be 100% argon, having a purity of 99.9% argon. Addition of oxygen and carbon dioxide should be avoided for metallurgical reasons. An addition of helium may also be useful under some circumstances.

Hope this clarifies.

Best regards,

Kamal Shah BE,MBA,IWE

National Segment Manager- Oil & Gas Downstream & Pipeline

voestalpine Bohler Welding India Private Limited