Re: [MW:35055] SS clading on CS

Since you are using SS316 to CS, it will be appropriate to use E309Mo or ER309Mo in place of E309 

as SS 316 contains Mo besides Cr & Ni.

C Sridhar

On Wed, 5 Jun 2024 at 13:42, Amol Betkar <amolbetkar90@gmail.com> wrote:

Dear Mashood,

When welding stainless steel to carbon steel or when dealing with different grades of stainless steel, the choice of filler material is critical to ensure the integrity and performance of the weld.

Welding SS316 to a CS Flange with SS309

1. Using SS309 as a filler for welding SS316 to CS:

   • Composition and Compatibility:
     • SS309: This grade is often used as a filler metal for welding dissimilar steels, including stainless steels to carbon steels. SS309 contains higher chromium and nickel content than SS316, which helps in accommodating the differences in thermal expansion and enhancing corrosion resistance at the weld interface.
     • SS316 and Carbon Steel (CS): Carbon steel (CS) has a different composition and thermal properties compared to SS316. SS316 is an austenitic stainless steel with molybdenum added for improved corrosion resistance.
     • SS309 filler metal is designed to bridge the differences in composition between SS316 and CS. It can handle the dilution from the carbon steel and provide a good quality weld with adequate corrosion resistance and mechanical properties.
   • Potential Issues: Using SS309 should not present significant problems in terms of composition. The SS309 filler is designed to manage the differences in expansion rates and chemical composition between stainless and carbon steel, making it a suitable choice for cladding SS316 on a CS flange.

2. Using SS309 for welding SS316 completely:

   • Compatibility of SS309 and SS316:
     • SS309 is generally compatible with SS316, though it is typically used for welding dissimilar metals.
     • Mechanical Properties: SS309 will have slightly different mechanical properties and corrosion resistance compared to SS316. While SS309 is more oxidation-resistant at higher temperatures, SS316 offers better overall corrosion resistance due to its higher molybdenum content.
     • Weld Characteristics: When welding SS316 with SS309, the resulting weld may have different properties than a weld made entirely with a filler matching SS316. This could include slight differences in corrosion resistance and mechanical properties in the weld zone.
   • Potential Issues: While there is generally no problem using SS309 to weld SS316, the resulting weld might not fully match the performance characteristics of the base SS316 material, particularly in environments where SS316's specific properties are crucial (such as resistance to certain types of corrosion).

Recommendations:

• For Cladding Application: Using SS309 to weld the SS316 cladding plate to the CS flange is appropriate and should not cause significant issues in terms of composition or weld quality.
• For Welding SS316 Components: If the application demands the specific properties of SS316, it is preferable to use a filler that matches SS316 to ensure consistent properties throughout the weld. However, if slight differences in properties are acceptable, SS309 can be used without major concerns.

In summary, SS309 is a suitable filler material for welding SS316 to a CS flange and is generally compatible with SS316 for welding purposes, though attention should be given to the specific application requirements.

On Wed, 5 Jun 2024 at 13:21, Mashood Khan <mashood@epic.com.pk> wrote:

Dear, 

The current circumstances is ,

Vessel is SS316 and I am welding a SS316 4mm plate on the CS flange as a cladding.

I want to know if I weld the SS316 Cladding plate on CS Flange with SS309. is it any problem with their composition?

Second is that SS309 is compatible with SS316 if I totally weld with SS309 Electrode.

Regards,

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06/05/24, 12:42:33 PM

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Best regards,

Amol K.B

B.E(Mech), CSWIP 3.2.2, NACE CIP 1 & ASNT LII(4M)

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