Mr. Bilal,
Your base metals are, Tube Sheet: SA 182 F6A Cl.2 → P-No. 6, Gr. 3 (13% Cr martensitic stainless steel)
and Tube: SA 213 T9 → P-No. 5B (9Cr-1Mo ferritic steel).
Recommended GTAW fillers are ER80S-B8 for strength-bearing joints. Though ER309L/ER309LMo are
used for dissimilar welding between Cr-Mo and martensitic stainless steels, buttering helps prevent hard,
brittle martensite at the fusion zone. ERNiCr-3 (Inconel 82) is a better choice for providing crack resistance
and avoiding PWHT; i.e., for buttering, you can use ERNiCr-3, and for tube welding, use ER80S-B8.
PWHT is not required for tube-to-tube sheet seal welds. Buttering with ERNiCr-3 or ER309L also helps to
avoid PWHT in the assembly, as it controls hardness.
C Sridhar.
On Wed, 5 Nov 2025 at 00:03, Ch Bilal jovinda <chbilaleng1989@gmail.com> wrote:
Dear Team,--I want to confirm about the consumable selection and PWHT requirement (chromium content greater than 3%) for tube to tubesheet joint. Material is listed below,1. TUBE SHEET: SA 182 F6A CL2(P#6 Gr.3) 80MM thickness.2. TUBE : SA 213 T9(P # 5B) 19mm dia 3 mm thickness.Below confirmation is requested,1. Consumable for GTAW?2. PWHT requirement?Best Regards,M Bilal
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