This change in ferrite content is probably due to cooling rate difference .... related to solidification process.
Prashant Nimbalkar
From: shanmugam govindarajan <rajansgr@yahoo.com>
To: MW-Google Groups. <materials-welding@googlegroups.com>
Sent: Saturday, February 25, 2012 5:16 AM
Subject: [MW:13777] Ferrite Number.....
Dear Experts,
During Ferrite check on the strip cladding, we noticed FN as 1.5, 2, 2.5 whereas project specn requires 3 to 10.
These low FN is noticed near the cirseam joints in the vessel. May be the first or last pass of strip cladding when strip cladding is done in each shell.
Please send me some info about root cause, remedial action that is to be taken and reference to code/specn.
With regards,
Govi.
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