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sushil gaur
Hi Uday,
Choice of S.S 304 may be correct for the said design temperature(425 Deg C). In order to keep the IGC/ sensitization factor under control use 308L welding consumables/fillers would be advisable.
It would be good to know what’s the process fluid involved? If the process fluid is aggressive, then a switch to SS 316/316L would be a better choice. This would be a process engineer/metallurgical engineers’ call to select 304 or other alternatives (316/316L) as needed.
Thanks
Pradip Goswami.P.Eng, IWE.
Independent Welding & Metallurgical Engineering Specialist
Saudi Aramco Approved Designated Project Welding Engineer (DPWR)
Qatar Petroleum Approved, SME-Materials & Corrosion Engineering.
Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/
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Austenitic Stainless Steel Sensitization | Austral Wright Metals
From: uday prabhu <uda...@gmail.com>
Sent: November 6, 2021 8:46 AM
To: Materials & Welding <material...@googlegroups.com>
Subject: Alternative MOC - SA387 + SS.304 cladding to complete SS.304
Dear Experts,
Vessel MOC = SA387 GR F11 CL2 + 3mm SS.304 cladding
Max operating Temp = 425 C
Max Pr = 20 bar (g)
Can we replace above moc with SS.304.
Will there be Sensitization issues a this temp ??
Regards,
Uday Prabhu
1. Set the corrosive environment to 425°C of SA-382 F11 Cl2 steel with cladding SS304.
2. Depending on whether the environment is oxidizing or reducing, 300 series stainless steel works well at higher temperatures.
3. To do this, select stainless steel type SS304L. Easier to weld, and less risk of IGC (intergranular corrosion) due to precipitation of chromium carbides, type M23C6.
4. Use SS 304L base material in solution annealing condition before welding.
5. Use filler material type E-308L for welding.
6. Depending on the thickness of the piece> 1”, carry out PWHT of dissolving chromium carbides. Although for smaller thicknesses, the welding of the SS304L does not need PWHT. Check.
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