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[MW:1292] consumable for 316L clad nozzle with PWHT

By Materials & Welding
Austenitic steel consumables generally not recommended due to diff in thermal expansion when PWHT is required or operating temp above 300 deg C. here the selection depends on the service fluid, and operating/design temperatures involved. assuming you don't have wet H2S or sulfur environment then it is recommended to use Ni based consumables such as ERNiCr-3/ENiCrFe-2 etc.. for this application.

---------- Forwarded message ----------
From: Sukamal Naskar <sukamalbecmet@gmail.com>
Date: Mon, Nov 10, 2008 at 11:18 AM
Subject: Need An Urgent Help

This is a quary regarding overlay welding. Normally if we have a carbon steel plate ( SA 516 Gr.65 ) with cald material ( 316L), we do the 1st layer with 309 MoL then final layer with  316L , provided we have the accessability. But if we don't have the accessability, say for 2" nozzle butt joint,single sided girth welding, where  we don't have any such kind of welding accessability, can we use the full butt joint using ER 309MoL  including the carbon steel portion ? if so, what will happen with the inside clad portion , where we don't have the 316 L caldding ? and also the ferrite content on the clad portion? Also can we use these joint above temperatute 350 deg C, or say have  PWHT at 610 +/- 10 dec for 3 hrs.? 
 
 Also for the same 2" nozzle ( carbon steel with cald 316L), if we start the cad portion ( 316 L) with the filler material ER 316L, then ER 309MoL for the rest carbon steel portion also, what will be the Metallurgical problems? 
 Or can we use, the 316L , then rest with E NiCrFe-2 , for the PWHT at 610 +/- 10 deg for 3 hrs.? Can we use these welding process.
 Regards
 
Sukamal Naskar
MMHE ATB


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