Nitrid Precipitation in Duplex SS (ISO 17781 QLll)

[Ilkin Hasanov]

Hi All,

Could you please advise,

If during micro-structural analyse  it were observed Nitrid Precipitates , how need to evaluate test results (mechanical test was done according ISO17781 QL 2)

I want to note that, Specimens were taken for WPQT of Duplex SS, MDT is -25Celsius

PQT coupon dimensions are WT=18mm OD=168.3mm.

Corrosion test results are acceptable ,There was no observed any pittings & Charpy V test results are acceptable (@-46celsius)

Regards, 

Ilkin Hasanov.

[Ahmed Osman]

Dear Ilkin Hasanov ,

 Acceptance of Nitrid precipitations is depending on if CVN and ASTM G 48 test passed or not .. just to be recorded in the report  

Best Regards ,

Ahmed Osman

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