Re: [MW:35373] Pipe 304L(P8) – Pipe 304L(P8)

ER308H filler wire does have a higher risk of intergranular corrosion compared to ER 308L due to its

higher Carbon content which leads to Carbide precipitation at the grain boundaries during welding. 

Hence it is not advisable to use ER308H filler wire in any case.

ER 308H  is suited for high temp. applications like power generation and where intergranular corrosion 

is less critical and where strength is critical.

C Sridhar.

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On Wed, 25 Dec 2024 at 13:01, Vinay <vinay.thattey@gmail.com> wrote:

Yes . E/ER 308L is having beter corrosion resistance  but strength reduces marginally. You can also try E/ER 308LM

On Mon, 18 Nov 2024 at 17:39, Marco Nunes <marcovsky82@gmail.com> wrote:

Can  anyone provide some assistance in the issue identified below:

The details are as follows:

 

Details

Parent material Pipe 304L(P8) – Pipe 304L(P8)

Inservice temperature range – 35-85 °C

Operating Pressure – 0.4 -0.5 MPaG

Process Type – Process Condensate.

Carbonic acid – there may be the presence of carbonic acid as indicated by CGCL.

 

Approved Process

WPS# P8-P8 AR - Filler material ER308L- F6 filler metal

 

Quality Issue

ER308H rods were used instead of ER308L on two locations of the 304L piping.

 

Technical Advice Request

The client indicated that the use of the ER308H Filler Wire instead of the ER308L has a higher risk of intergranular corrosion and corrosion related issues.  

 

Please advise on the short term or long-term quality effects on the integrity of the welded joints where the ER308H filler wire were utilized.

 

Thanking you in advance.

Mark Nunes

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