Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario, Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Temburu
Chiranjeevulu
Sent: Tuesday, June 19, 2012 3:11 AM
To: Materials & Welding
Subject: [MW:14588] FERRITE PERCENTAGE
Dear Expert,
If A312TP321 material will get ferrite % more than
required,what will happend during stabilization heat treatment, and why we
have to check ferrite% before stabilization heat treatment.
Regards,
T.CHIRANJEEVULU.
ENGINEERS INDIA LTD
ENGINEER-WELDING/NDT
OPAL PROJECT,DAHEJ.
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1 comment:
Dear Chiranjeevulu
Stabilization annealing in the range of 500-900 Deg C will lead to
sensitization and embrittlement due to the sigma phase formation.
Sigma phase formation will depend on the ferrite %, where more than 8%
ferrite will result in sigma phases which is continuous in nature. So
in ASS the ferrite % is limited to 3-8%.
Thanks and Regards
Harikrishnan N S
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