PQR-Qualified in Duplex Stainless Steel UNS-31803 / WPS-UNS-32750

[Muhammad Azeem]

Gents,

I need your kind reference comments to clarify regarding the separate WPS required for each UNS in P-10H qualification ..

If PQR qualified with UNS-31803 Duplex Stainless Steel.

WPS can be prepared with UNS-32750 Super Duplex Stainless ...

Regards,

Muhammad Azeem Iqbal

[pgos...@rogers.com]

No, in most of the cases.

32750 is a SDSS(25Cr), while 31803 is a DSS(22Cr). For P10H group every grade is different, in chemistry, mechanical properties & corrosion resistance. You require separate PQR with all comprehensive testing for each individual grade.

 

What’re the process requirements and intended service/s.

 

Thanks.

 

Pradip Goswami.P.Eng, IWE.

Independent  Welding & Metallurgical Engineering Specialist

Consultant: SNC Lavalin Inc. (Nuclear &Non-Nuclear)

Saudi Aramco Approved Designated Project Welding Engineer (DPWR)

Qatar Petroleum Approved, SME-Materials & Corrosion Engineering.

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[james gerald]

There are certain points to be considered.

1. Though both UNS-31803 & 32750 falls under same P-No: 10H / 1 but their UTS values are different. UNS 31803 welded using consumable ER 2209 which produces a UTS value of 90ksi whereas UNS32750 shall be welded with a consumable which has a UTS valiue of 120Ksi and hence preferred ER2594.

2. ASTM G48 tests are mandatory to ascertain its suitability to service, UNS31803 tested at temperature of 25degC whereas UNS 32750 tested at  40dgeC and hence suitable welding consumable to be selected.

3. Generally welds are considered anodic when compared with the Basemetal due to its area and corrosion are localized in welds. UNS 31803 has a PREN value of 34 whereas UNS 32760 has a PREN value of 40 due to its high alloy elements.

4. Moreover for Duplex and superduplex stainless steels are governed by various Clients specifications which will be more demanding and will not permit.

Hence WPS for UNS31803 cannot be used for UNS32750.

Hope our experts can add more points to clarify.

Thanks & Regards

J.Gerald Jayakumar

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