RE: [MW:20923] Welding of SS 304H to P-91

Hi Arunabh,

 

EIL definitely has access to API documents. API TR 938-B(2008)-is on Use of9Cr-1Mo-V steel for refining and petrochemical applications.

 

Below are the recommended practices on performing dissimilar welds between grade-91 and austenitic stainless steel.

 

The ideal consumable would be Inconel-82/182 (E-NiCr-Fe3) or Inco weld-A type.The latest development  for such dissimilar welds is EPRI-Program 87, welding consumable manufactured by Metrode.

 

E/ER-309 type welding consumable is certainly outdated.You may bring this to the notice of EIL Standard developments group.

 

Hope this info would be of help.

 

Thanks

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Specialist

Ontario, Canada

pgoswami@quickclic.net

pradip.goswami@gmail.com

pradip_goswami@yahoo.ca

 

6.4.8.2 Joining to Stainless Steel

Transition pieces or multiple buttering/PWHT operations may also be necessary when joining Grade 91 steel with austenitic stainless steels because sensitization may take place if PWHT is applied to stainless steel. In this case, Grade 91 is buttered with Ni-Cr-Fe filler metal, PWHT is performed at P91 PWHT temperature, and the weld to SS is completed using same filler metal. Further PWHT typically is not required .

6.4.8.3 Filler Metal Selection

Weld filler metal selection possibilities for dissimilar metal welding are shown in Table 11. When nickel base welding consumables (E/ERNiCrMo-3) are used, it is advisable that the manufacturer confirm that these filler metals will not embrittle at the high PWHT temperature of 9Cr-1Mo-V steel.

 

On Tue, May 27, 2014 at 4:42 PM, ARUNABH BERA <bonjoe23@gmail.com> wrote:

Dear All

Kindly clarify the doubts:

Sir in Ethylene Cracker Furnace at one of the Petrochemical Plant, we have a hook-up between P-91 and SS304H. Here we are using ER309 as the filler.

Is it acceptable, if not what can be the probable problems associated with the filler selection and what are the solutions 

Regards

Arunabh

Engineers India Limited

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