Sunday, July 1, 2012

RE: [MW:14726] carburization of furnace tubes

Hi Ags,
 
As you're in the operations industry you would have more hands on experience. Looking at the damage mechanisms carburization is common to furnace tubes. Control of operating parameters and selction of corerct alloys may help to mitigate the same. Metallogrphy would a spot detection for carburization , it would not be helpful for volumetaric damages such as creep. Moreover  tough thickness metallography couls doen only on failed tube or a tube which could be sacrifieced forsuch testing.
 
In addtion to metallogrphay one or a combination of RT, UT and ECT could be help. These NDE techniques would  be able to detect the  various degree of creep damages which is comon for such high temeperature components.
 
The atatched papers shed soem lights on the pros and cons of each technique.
 
Thanks.
 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist

Ontario, Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

 


From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Shashank Vagal
Sent: Saturday, June 30, 2012 9:52 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:14725] carburization of furnace tubes

Consult an Eddy current Testing guy, may be it will help.

--- On Sat, 30/6/12, ags 36681 <ags1280@gmail.com> wrote:

From: ags 36681 <ags1280@gmail.com>
Subject: [MW:14724] carburization of furnace tubes
To: "materials-welding" <materials-welding@googlegroups.com>
Date: Saturday, 30 June, 2012, 6:54 PM

Dear friends,

we recently changed the ethane furnace tubes after service in 4 years,
now we are planning to segregate the healthy tubes & return  bends
from used/removed lot to re-use in future if needed. Material of the
tube/bend is 25Cr/35Ni/Nb+Micro.

We can check visually for cracks, thinning, bowing etc. UT is not
feasible, because there is some sort of rough coating over it.

How about the field metallography for carburization?

thanks a lot to all dear friends.

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