RE: [MW:14728] 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 selection of correct alloys may help to mitigate the same. Metallographic would a spot detection for carburization , it would not be helpful for volumetric damages such as creep. Moreover  tough thickness metallography could done only on failed tube or a tube which could be sacrificed for such testing.

 

In addition 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 common for such high temperature components.

 

The attached papers shed some 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

 

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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. -- To post to this group, send email to materials-welding@googlegroups.com To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com For more options, visit this group's bolg at http://materials-welding.blogspot.com/ The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.