Alternative MOC - SA387 + SS.304 cladding to complete SS.304

[uday prabhu]

Dear Experts,

Vessel MOC = SA387 GR F11 CL2 + 3mm SS.304 clading

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

[sushil gaur]

NO.S.S.304 WILL NOT STAND WITH HEIGHT TEMPERATURE SERVICE 

THANKS AND REGARDS 

SUSHIL GAUR 

M.NO.9530278378 

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sushil gaur

[pgos...@rogers.com]

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/

Email:pgos...@rogers.com,pradip....@gmail.com

Cell/Whasapp:1-905-9793232

 

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

Virus-free. www.avg.com

[Ramon Briceno]

Dear Uday, 

Look at this recommendation, for the replacement you are looking for: 

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. 

Regards, 

Ramon Briceno

linkedin.com/in/ramonbriceno-metalengineer

---

De: material...@googlegroups.com <material...@googlegroups.com> en nombre de uday prabhu <uda...@gmail.com>
Enviado: sábado, 6 de noviembre de 2021 8:46 a. m.
Para: Materials & Welding <material...@googlegroups.com>
Asunto: [MW:32591] Alternative MOC - SA387 + SS.304 cladding to complete SS.304

 

[sandip Zapate]

Dear Uday, 

Base metal is GR11, hence PWHT is  mandatory requirement for Weldmet & HAZ

Now coming to SS304 material, we are using ss 304 as cladding for corrosion purpose, hence Check ss304 material for any corrosion test if required as per project specification after PWHT, bcz there are chances of sensatization above 450 degrees for stainless steel grades, 

If test found ok now can start WPS /PQR qualification for combination of GR11 + SS304 clad , 

You can weld GR 11 matetial with ss 304 Clad or you have another option as per ASME sec  IX for seperate qualification of base metal in 1st coupon and qualification of ss 304 metal with 2nd coupon,

Thanks & Regards, 

Sandip Zapate 

8879226079

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