Dear Rao,
As Mr. Hegde mentioned in the trailing mail, it is suggested to use Ni based filler metals instead of E309L type for welding of SS410S materials. In general, 309 type filler metal should not be used for temperature above 600 Deg. C, due to sigma formation (Brittle phase) in the welds.
Basically this electrode shall produce higher ferrite content around 20% in the welds, which will convert into brittle sigma phase when temperature above 500 Deg. C. Sigma phase would reduce the toughness and ductility and will increase hardanability and hardness of the weld metal.
In your case, piping (SS410S) and complete vessel undergoes PWHT as per Code requirement and hence it is preferred to use ENiCrFe-3 for CR overlay and ERNiCr-3 type filler metal for piping materials.
If PWHT can be avoidable for SS410S materials, you can use E309L type filler metal. Refer to API RP582 for recommendation of selection of welding filler metal based on temperature limits.
Regards,
L. Prabhu kumar,
Sr. Principal Engineer,
Equipments & Materials Dept.,
Saipem India Projects Limited,
Tel:+91 44 43906588, Ext.: 588, Fax:+91 44 66840345,
Mobile Ph. No.: +91 9003010978.
From:
Sent: Monday, June 28, 2010 9:24 AM
To:
Subject: [MW:5765] RE: 5751] Welding of SA 240 TP 410S material.
Hi!
As base metal is of LAS , req PWHT at min 650C , Therefore suitable consumable for clad restoration of 410 S clad is
Preheat Temp . of base metal for barrier layer is 100 C , (No need of preheating for subsequent layers. min ,Interpass temp is 175 max, Welding Current – 110-120 Amp for 3 .2 dia electrode.
Regards
Hegde
From:
Sent: Saturday, June 26, 2010 5:21 PM
To:
Subject: [MW:5751] Welding of SA 240 TP 410S material.
Dear all,
Can any body share the experience in welding of SA240 TP410 Material.
I have a Vessel consists SA387 Gr.11 Cl.2 material cladded with SS410S.
Internal Piping material : SS410S thickness 10-15mm.
Construction Code : ASME SEC VIII Div.1.
Welds in SS410S will under PWHT of low Low alloy steel.
Need guidance in Preheat & interpass temperature of SS410 material welding (Consumable selected for welding of SS410S is 309L type).
regards
P.Rao
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