Exaton 27.31.4.LCu (GTAW)

Exaton 27.31.4.LCu is a copper‑alloyed chromium‑nickel‑molybdenum filler material for GTAW of high‑alloy austenitic stainless steels such as Sanicro 28 and Sanicro 41.

Key Features

• High corrosion resistance for aggressive environments (phosphoric/sulphuric acid, sour gas, seawater).
• Consistent chemistry and mechanical properties batch‑to‑batch.
• Suitable for joining and overlay welding, reducing the need for multiple weld passes.
• Available in 5 kg drums with moisture‑resistant SAW flux packaging.

Specifications

• Classifications: EN ISO 14343‑A : W 27 31 4 Cu L, SFA/AWS A5.9 : ER383
• Approvals: CE, UKCA (EN 13479), VdTÜV 02629
• Alloy Type: Austenitic, 27 % Cr – 31 % Ni – 3.5 % Mo – 1.0 % Cu – low C
• Shielding Gas: I1, R1 (EN ISO 14175)
• Tensile (As Welded 20 °C): Yield 440 MPa, Tensile 600 MPa, Elongation 35 %
• Charpy Impact: 200 J at 20 °C, 140 J at –196 °C
• Typical Wire Composition %: C 0.01, Mn 1.7, Si 0.1, S 0.001, P 0.012, Ni 31.0, Cr 27.0, Mo 3.5, Al 0.04, Cu 1.0, N 0.05, Nb 0.02, Co 0.03

Applications

• Heat exchangers, evaporators, transport piping
• Overlay welding for corrosion‑resistant repairs
• High‑temperature, sour‑gas and chloride‑bearing service environments