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[MW:35325] Re: Pipe 304L(P8) – Pipe 304L(P8)

By Materials & Welding
Hi Mark,

ER308H 
Carbon Content : High Carbon Content (0.04%-0.08%)
Strength : Higher strength at elevated temperature due to its carbon content, suitable for high-temperature service applications
Corrosion Resistance: Slightly reduced compared to ER308L because higher carbon content can lead to sensitization (formation of chromium carbides at grain boundaries)
Applications: Used in applications requiring creep resistance or operation at elevated temperatures, such as in power plants, boilers, and chemical plants.

ER308L
Carbon Content: Low carbon content (<0.03%).
Strength: Lower strength compared to ER308H, especially at high temperatures.
Corrosion resistance: Superior to ER308H because low carbon minimizes the risk of sensitization and intergranular corrosion, especially in as-welded conditions.
Applications: Ideal for applications where corrosion resistance is critical, such as food processing equipment, chemical tanks, and piping systems, used for welding 304L or 304-grade SS, particularly where PWHT is not feasible.
On Monday, November 18, 2024 at 8:09:22 PM UTC+8 Marco Nunes 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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