Base material: SB 444 UNS NO 6625 Gr. 1 ( 1" x 2.77 mm)
Filler wire : ER NICRMO3
PREHEAT: 31 C
INTERPASS TEMP. 105 C
HEAT INPUT: 0.877, 0.767 J for Root and cap PASS
We have carried our G 28 test, but the rate of Corroion is with in
acceptable limit ( 0.05 mm / month)., but at in Micro at X 50 revealed
preferential attack boundaries. Client is not accepting. We have
done twise this PQR, both times, same issue.
Please give your valuable suggestions
Regards
Venkat
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