Pipe 304L(P8) – Pipe 304L(P8)

[Marco Nunes]

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

[Macario Jr. Palola]

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.

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[Parminder Singh]

High Carbon, More chance of Chrome Depletion at boundaries (Less Creep Resistance) 

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[Vinay]

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

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[Vishwas Keskar]

Is typ 308H is used at process fluid side ? 

If yes , then remove it completely and reweld .

If it is in between or at outer side thickness welding , then no issue

Sent from my iPhone

On 25 Dec 2024, at 1:00 PM, Vinay <vinay....@gmail.com> wrote:



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[Kannayeram Gnanapandithan]

308 L is for better corrosion resistance application,  But 308 H is for high temperature with minimum carbon control is maintained say 0.04, inferior to corrosion resistance. Ur Temp is not high. 

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015, ISO 3834, EN 15085, 

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

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[sridhar cn]

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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