__________________________________________________________________________________________________________________________________________From:
Jeremy Caron [mailto:JCaron@haynesintl.com]
Sent: Tuesday, August 09, 2011 8:59 PM
To: Bathula Raghuram (Mumbai - PIPING)
Subject: Welding HAYNESR 230R Alloy to P91 Steel
Bathula,
This message is in response to your question about welding HAYNES®
230® alloy to P91 steel. While we do not have any direct experience
with this material combination, the HAYNES 230-W® filler metal would
be suggested for this dissimilar joint. The main concern would be
that the specific preheat, interpass, and postweld heat treatment
(PWHT) guidelines for welding P91 steel are generally not in agreement
with suggestions for welding 230 alloy. Since dissimilar welds
represent a compromise between the alloys being joined, the specific
requirements and restrictions of each alloy need to be considered to
achieve the best overall properties. While preheat above room
temperature is not required for 230 alloy, I do not foresee an adverse
effect from a slight preheat (≈125°C) of the joint prior to welding
based on P91 welding suggestions. The interpass temperatures for both
alloys should be maintained as low as possible; the suggestion for 230
alloy is a maximum of 93°C. Regarding PWHT, the P91 alloy requires a
minimum of 2 hours at ≈750 to 775°C, while PWHT is not required or
recommended for 230 alloy. This PWHT should produce some carbide
precipitation in the 230-W weld metal, but ductility should remain at
an adequate level. I would still suggest limiting the PWHT to a
minimum amount of time. Carbon migration during PWHT should be
limited due to the similar carbon levels of the alloys, restricting
the formation of any adverse microstructures near the fusion boundary.
I have attached the relevant brochures for your information. Good
luck with this welding application. Please let me know if you have
any further questions.
Regards,
Jeremy Caron, Ph.D.
Staff Engineer - Welding Metallurgist
Research and Technology Group
Haynes International, Inc.
1020 West Park Avenue
P.O. Box 9013
Kokomo, IN 46904
Office: 765-456-6233
Email: jcaron@haynesintl.com
On Aug 10, 2:28 am, "pgoswami" <pgosw...@quickclic.net> wrote:
> HAYNES publication,H-3159.pdf
> 364KViewDownload
>
> Pradip Goswami,P.Eng.IWE
> Welding & Metallurgical Specialist & Consultant
> Ontario,Canada.
> Email-pgoswami@ <mailto:sympatico.capgosw...@quickclic.net> sympatico.ca,
> pgosw...@quickclic.net
>
> _____
>
> From: pgoswami [mailto:pgosw...@quickclic.net]
> Sent: Tuesday, August 09, 2011 5:24 PM
> To: 'materials-welding@googlegroups.com'
> Subject: FW: 12158] ASME Section I - welding Alloy 230 (UNS N06230) to P91
>
> From: pgoswami [mailto:pgosw...@quickclic.net]
> Sent: Tuesday, August 09, 2011 5:16 PM
> To: 'materials-welding@googlegroups.com'
> Cc: 'John Henning'
> Subject: RE: 12158] ASME Section I - welding Alloy 230 (UNS N06230) to P91
>
> John,
>
> The attached information on alloy 230 would be of help to you. For DMW of
> P-91#Alloy 230, fillers matching chemistry of alloy230 would be advisable
> .You may have to butter P-91 ,PWHT separately then join to alloy 230. Or use
> of a transition piece (P91# Alloy 230) could expedite the filed work.
>
> It may be good to contact Haynes regarding the welding consumables and
> further welding recommendations. The second document H-3159 is more
> specific. I've highlighted some of the relevant texts for your reference.
>
> This alloy is an extension of the hastelloy family. The common problems of
> welding an Nickel base alloy to P-91 should be taken into account for such
> welds.The diffusion issue would not be adequately felt at the time of
> fabrication , but would surface after years of service. Definitely one
> common issue would be Carbon migration form P-91 to Alloy-230 weld and HAZ
> interface , which may weaken the P-91 alloy. However this diffusion is
> highly design/service temperature oriented. Dilution during the buttering
> of P-91 should be kept as minimal.
>
> It may be a good idea to check such experiences with Haynes.
>
> Thanks.
>
> Pradip Goswami,P.Eng.IWE
> Welding & Metallurgical Specialist & Consultant
> Ontario,Canada.
> Email-pgosw...@sympatico.ca,
> pgosw...@quickclic.net
>
>
>
> -----Original Message-----
> From: materials-welding@googlegroups.com [
>
> <mailto:materials-welding@googlegroups.com>
> mailto:materials-welding@googlegroups.com] On Behalf Of J
> Sent: Monday, August 08, 2011 6:56 PM
> To: Materials & Welding
> Subject: [MW:12158] ASME Section I - welding Alloy 230 (UNS N06230) to P91
>
> A customer has asked us to weld an Alloy230 drain line to a P91 superheater
> header. The unit is a heat recovery steam generator designed to ASME
> Section I. While I have extensive experience with
> P91 welding and heat treatment, however I am unfamiliar with Alloy 230. The
> purpose for using this nickle based alloy is to eliminate oxidation damage
> and sagging of this particular drain line as it typically has no flow during
> operation and therefore is uncooled. I am looking for information from
> anyone who has experience with this alloy and, better still, who has welded
> this particular couple.
> Depending on material chosen for welding this dissimilar joint what would be
> the metallurgical implications at the weld interface where dilution effects
> and diffusion would be most pronounced. I do not need catalog information.
> Thanks for any information.
>
>
> - Show quoted text -
--
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