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Join Date: Jul 2008
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steel,welding,ndt,heat treatmrent,structure,phase transformation

07/18/2009 12:15 AM

hello to every body in forum

i put a discussion stainless steel with martensite structure is magnetic. why austenite is non magnetic . any suggestion for the heat treatment( normalizing or annealing) after the welding of stainless steel or the stress relieving of S.S . any ASTM code /standard regarding this .

thanx

moonlight

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Commentator

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Location: DOMBIVLI,MUMBAI SUBARB, MAHARASHTRA,INDIA.
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#1

Re: steel,welding,ndt,heat treatmrent,structure,phase transformation

07/19/2009 12:51 AM

Dear sir.

You may try this site ' www.gowelding.com ' hope you will get all about welding.

Thank you.

V.D.DEODHAR.

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Associate

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#2

Re: steel,welding,ndt,heat treatmrent,structure,phase transformation

07/19/2009 12:56 AM

In my 5 year experience i have never seen any stess relieving of S.S. . in case of welding ,stress relieving is depend upon your apporoved WPS .

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Associate

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#3
In reply to #2

Re: steel,welding,ndt,heat treatmrent,structure,phase transformation

07/19/2009 1:29 AM

sir if we do welding on SS or the heat treatment annealing or normalizing)done done to SS does it not necessary to relieve stresses(residual stresses).

suggestion welcome

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Associate

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#4
In reply to #3

Re: steel,welding,ndt,heat treatmrent,structure,phase transformation

07/19/2009 5:54 AM

In case welding S.S to S.S similar metal P8 to P8 as per ASME B31.3+ASME sec IX stress relieving is not required after welding regardless of thickness.even though in case of dissimilar metal either p1 (C.s)to p8 (S.S) or P4 (alloy) to P8 (S.S) stress relieving is required only c.S or alloy portion of joint if stess relieving is applicable as per code. stess relieving is not required or applicable for s.s joint.

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Guru
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#5

Re: steel,welding,ndt,heat treatmrent,structure,phase transformation

07/19/2009 6:05 PM

Hi all,

Austenitic phase is non magnetic because its structure (FCC) other iron structures BCC are ferromagnetic (well just if they are below its Curie temperature).

Regarding Austenitic SS, usually structural/pressure vessel Codes nor specify nor forbid a stress relieving HT. My experience is that this type of steel is not HT after welding as it's not necessary to stress relief and some problems could arise if HT is done (sensitization, sigma phase....)

So if your material is austenitic SS, don't heat treat it after welding.

Kind regards

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#6
In reply to #5

Re: steel,welding,ndt,heat treatmrent,structure,phase transformation

07/20/2009 12:42 AM

thanx

moonlight

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#7
In reply to #6

Re: steel,welding,ndt,heat treatmrent,structure,phase transformation

07/20/2009 1:19 AM

Austenite SS material are FCC structured and they are non magnetic. Since they do not form hard zones, welded joints do not require any Pre / Post welding heat treatment. Sometimes solution annealing at 10450C is done to separate Carbon – Chromium precipitation.

Marten site structure requires preheating, PWHT to avoid cracks during and after welding. There is no such problem while welding austenite materials as they are easily weldable and also have good ductility compared to marten site steels.

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Anonymous Poster
#8
In reply to #7

Re: steel,welding,ndt,heat treatmrent,structure,phase transformation

07/20/2009 8:12 AM

nice and

thanx

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Associate

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#9
In reply to #7

Re: steel,welding,ndt,heat treatmrent,structure,phase transformation

07/20/2009 8:16 AM

hello sir

but why FCC is Non magnetic?bcc not .without clarifying it the question remains unsolved.

moonlight

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