Barrier layer for corrosion resistant overlay

[atul chaturvedi]

Dear All,

I have a doubt regarding body seat corrosion resistant overlay welding
on valves by valve manufacturers .Can they use E316-16 directly on
body seat(A 216 WCB) without using dissimilar weld metal barrier
layer

regards

atul

[Prabhu Kumar L]

Dear Mr. Atul,

As you mentioned, in general most of value manufacturers carryout
overlay on seating area with direct matching electrodes (E316) without
using barrier layer electrodes i.e. with E309 type due to the following
reasons.

- Overlay on seating area is not for corrosion purpose. It is required
for purpose of wear resistance to contact with the matching part.
- Most of the manufacturers are using automatic welding system to
carryout this overlay, hence the dilution problems are minimized.

If it is applicable for corrosion resistance purpose, it is strongly
recommended to use high alloyed electrodes for barrier layer (E309) and
rest by the matching electrodes in order to minimize dilution and
avoiding martensite formation in the interface, which will reduce the
corrosion properties.

Regards,

L. Prabhu kumar,
Sr. Principal Engineer,

Equipments & Materials Dept.,
Saipem India Projects Limited,
Nungambakkam High Road, Chennai - 600 034, India.
Tel:+91 44 43906588, Ext.: 588, Fax:+91 44 66840345,
Mobile Ph. No.: +91 9003010978.

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[george....@gr.bureauveritas.com]

Yes but the purpose of the barrier with E309 is to avoid hot cracking due to low FN and not martensite formation

Dr. G. Dilintas - Authorized Inspector Supervisor
I&F Regional Technical Manager
Bureau Veritas Piraeus - Greece
Tel: +30 210 40 63 113/4
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04
"Prabhu Kumar L" <l.prab...@saipem-india.com>

"Prabhu Kumar L" <l.prab...@saipem-india.com> Sent by: material...@googlegroups.com 16/06/2010 12:31 Please respond to material...@googlegroups.com

To <material...@googlegroups.com> cc Subject [MW:0] RE: 5612] Barrier layer for corrosion resistant overlay Ref

[Muhammed Ibrahim PK]

Hi,

 

We have to deposite 309L as barrier layer to avoid crack in weld interface even it is not for corrosion resistant overlay.

 

Reagrds,

Ibrahim

Thanks & Regards
Muhammed Ibrahim PK

[Prabhu Kumar L]

Dear Mr. Dilintas,

 

Please note that Austenitic SS electrodes such as E/ER316, E/ER308 is having ferrite content of around 9 to 10% would sufficient to avoid hot cracking. In case of 309 type, the % of ferrite is around 15 to 20%.

 

According to schaffler diagram, if we use 316/308 type electrodes directly on CS/LAS, the microstructure in the fusion line may fall in the Austenite + Ferrite + Martensite zone, since dilution of 30 to 35% would take place in the zone. However, the end micro-structure is supposed to be Austenite+ Ferrite.

 

Hope it clarifies.

 

Regards,

 

L. Prabhu kumar,

Sr. Principal Engineer,

 

Equipments & Materials Dept.,

Saipem India Projects Limited,

Nungambakkam High Road, Chennai - 600 034, India.

Tel:+91 44 43906588, Ext.: 588, Fax:+91 44 66840345,

Mobile Ph. No.: +91 9003010978.

[atul chaturvedi]

Dear All,

 

Finally, Valve manufacturer is agree to do the barrier layer by E-309.

 

Thanks,

 

Regards,

 

atul