OK Autrod 347Si

OK Autrod 347Si is an austenitic stainless steel filler material designed for welding 18Cr/8Ni/Nb and 18Cr/8Ni/Ti stainless steel alloys, offering good corrosion resistance and improved high‑temperature performance.

Key Features

• Stabilized with Niobium for enhanced resistance to intergranular corrosion.
• Higher silicon content improves wetting and overall weldability.
• Suitable for higher temperature applications.

Specifications

• Classifications: EN ISO 14343‑A: G 19 9 Nb Si, SFA/AWS A5.9: ER347Si, Werkstoffnummer: ~1.4550
• Approvals: CE (EN 13479), DB 43.039.13, UKCA (EN 13479), VdTÜV 09734
• Alloy Type: Austenitic (≈8 % ferrite) 19 % Cr – 9 % Ni – Nb
• Shielding Gas: M12, M13 (EN ISO 14175)
• Tensile (As Welded, EN M13): Yield 440 MPa, Tensile 640 MPa, Elongation 37 %
• Tensile (At 400 °C, EN M13): Yield 340 MPa, Tensile 460 MPa, Elongation 26 %
• Charpy Impact (As Welded): 100 J @ 20 °C, 70 J @ –60 °C
• Typical Weld Metal Analysis (%): C 0.04, Mn 1.3, Si 0.7, S 0.01, P 0.02, Ni 9.7, Cr 19, Mo 0.1, Cu 0.1, N 0.6, Nb 0.6, FN WRC‑92 4
• Typical Wire Composition (%): C 0.04, Mn 1.3, Si 0.75, S 0.013, P 0.011, Ni 9.7, Cr 19.2, Mo 0.1, Cu 0.1, N 0.05, Nb 0.7, FN WRC‑92 6
• Deposition Data:
  • 0.8 mm: 55‑160 A, 15‑24 V, 4.0‑17.0 m/min, 1.0‑4.1 kg/h
  • 1.0 mm: 80‑240 A, 15‑28 V, 3.5‑18.0 m/min, 1.5‑6.0 kg/h
  • 1.2 mm: 100‑300 A, 15‑29 V, 3.0‑14.0 m/min, 1.6‑7.5 kg/h
  • 1.6 mm: 230‑375 A, 23‑31 V, 5.5‑9.0 m/min, 5.2‑8.6 kg/h

Applications

• Welding of austenitic stainless steel alloys (18Cr/8Ni/Nb, 18Cr/8Ni/Ti).
• Projects requiring good general corrosion resistance.
• High‑temperature service where intergranular corrosion resistance is critical.