It is a austenitic stainless steel.
The correct temperature is 1080 Deg C.It is to be Water Quenched.
Regards,
C.Muniyandi
Dear Sir:
Thanks for support.
I am worry about mechanical and chemical properties of material after repeating Heat treatment. You know after new PWHT the material will affected for 6 Hours. also May be we will found new cracks after PWHT, what can we do in order to prevent new cracks.
Regards
K.Bazrafshan
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Karthik
Sent: Thursday, January 06, 2011 12:24 PMSubject: Re: [MW:9115] PWHT Of 347H
Hi,
PWHT can be repeated as per ASME Section VIII,Div.1-UHA-32 (e).Please find below the extraction.Holding time shall be the same as the original/as required by project spec.
UHA-32 (e) Vessels or parts of vessels that have been postweld
heat treated in accordance with the requirements of this
paragraph shall again be postweld heat treated after repairs
have been made.Thanks & Regards,
(Karthik)
Karthikeyan.S
QA/QC Manager
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282
--- On Thu, 1/6/11, Bazrafshan,kazem <KBazrafshan@BPC.CO.IR> wrote:
From: Bazrafshan,kazem <KBazrafshan@BPC.CO.IR>
Subject: [MW:9114] PWHT Of 347H
To: materials-welding@googlegroups.com
Date: Thursday, January 6, 2011, 3:28 PMDear All:
An urgent question:
Base on Project tech Documents we have to do PWHT( in 870°C for 3Hours,Air Cooled) for welding of 2 parts as A312-347H(12.7mm) to A182-347H(6mm,) together((A182 is as a branch to A312). After performing PWHT we found some cracks(dept of crack are from 3 to 8 mm) Just in weld seam.
Joint Information:
Welding process: GTAM + SMAW.
Design Tem: 780°C and Design Pressure is 5.3Barg in convection coils.
Welding consumables are :E347H Esab, Wire ER347 esab.
Shall we repeat PWHT after repairing or not?
If reply is Yes, how much time shall be Holding time ?
Please let me know your STD reference As well.
Thanks
Bazrafshan
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