SS 310 tubes to SS 316L

[hvala...@gmail.com]

Can anyone suggest suitable filler wires for welding of SS 310 tubes to SS 316L tube sheet? 

Does lack of Mo in ER 310 filler wires makes them unsuitable for the use in hydro-carbon service?

Can we use ER 309L Mo ?

[AMOL G]

ER309L Mo is generally most suitable filler wire.

Thanks,

Amol

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[manish kulkarni]

Refer API RP 582

Regards 

Sent from Yahoo Mail for iPhone

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[james gerald]

What is the operating temperature

Thanks & Regards

J.Gerald Jayakumar

0091-8838619635

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[Ashishranjan - Domech Fabricators Pvt.Ltd.]

  SS 310S tube + SS 316L tubesheet, GTAW tube-to-tubesheet weld, hydrocarbon service, operating temperature 350°C

  

Regards,

Ashish Ranjan

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[Ashishranjan - Domech Fabricators Pvt.Ltd.]

If the operating temperature is high, I would seriously consider ERNiCr-3 (Alloy 82) rather than trying to solve the problem by moving from ER310 → ER309LMo.

Nickel-alloy fillers are frequently used for difficult dissimilar-metal joints because they tolerate the chemistry gradient/dilution between different alloys and can provide a more forgiving weld-metal structure. This is especially relevant if PWHT or substantial thermal cycling is involved.

Regards,

Ashish Ranjan

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[Kannayeram Gnanapandithan]

316l 

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On Tue, Aug 11, 2026 at 3:46 PM hvala...@gmail.com <hvala...@gmail.com> wrote:

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[sridhar cn]

There is no single "correct" filler for SS310 to SS316L—the optimum choice depends on balancing metallurgical   

compatibility, corrosion resistance, and operating temperature. 

The general preference is

Up to ~300°C, corrosion-dominant service: ER309LMo

300–700°C with thermal cycling or dissimilar-metal concerns: ERNiCr-3 (Alloy 82)

For temperatures above ~700°C (furnaces, reformers, radiant tubes): ER310 to match the high-temperature    

characteristics of SS310.

You have not mentioned the operating temperature of the SS310 tubes (and the tube-to-tubesheet weld) during 

its service? That single parameter is likely to determine whether ER309LMo or ERNiCr-3 is the better engineering choice.

C. Sridhar.

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