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ferrite in Duplex

ferrite in Duplex

ferrite in Duplex

(OP)
My welder has welded a PQR cupon of Duplex (UNS S31803) on 30 mm thick plate by GTAW +SMAW process, the electrode used was of E2209-15 having Ferrite value as 36 in MTC.

Heat input used during welding was from 0.80-1.00kJ/mm. I did not checked the ferrite in as welded condition. Cupon was subsequently solution annealed at 1060 deg C for 75 mins.

Now test lab reports ferrite in weld as 25% whereas ferrite in HAZ is 51% & in PM is 59%.

NACE MR 0175 compliance is required so though all ASME sec IX test are passed the cupon is failed as ferrite in not meeeting the requirement of 35-65.

Can some body guide me where I went wrong & what shall I do now. I know that ferrite in austenitic tends to reduce post solution annealing,does same phenomenon occures in Duplex also. I did not checked ferrte before soutional annealing.

RE: ferrite in Duplex

You might want to post in "Metals & Metallurgy" forum.

Independent events are seldomly independent.

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