OK 67.70

OK 67.70 is an acid‑rutile MMA stick electrode designed for welding acid‑resistant stainless steels to mild and low‑alloyed steels, and for surfacing applications.

Key Features

• Acid rutile coating provides easy slag removal and stable arc.
• Suitable for stainless‑steel buffer layers over mild steel.
• VacPac hermetically sealed packaging protects against moisture.
• Wide range of diameters and amperage ranges for versatile use.

Specifications

• Classifications: EN ISO 3581‑A E 23 12 2 L R 3 2, SFA/AWS A5.4 E309LMo‑17, CSA W48 E309LMo‑17, Werkstoffnummer 1.4459
• Approvals: ABS, BV, CE, CWB, DB, DNV‑GL, LR, RINA, UKCA, VdTÜV
• Welding Current: DC+, AC
• Ferrite Content: FN 12‑22
• Alloy Type: Austenitic CrNi
• Coating Type: Acid Rutile
• Min AC OCV: 55 V
• Tensile (As Welded): Yield 510 MPa, Tensile 610 MPa, Elongation 32 %
• Charpy Impact (As Welded): 50 J @ 20 °C, 35 J @ –20 °C
• Typical Weld Metal Chemistry: C 0.02 %, Mn 0.6 %, Si 0.8 %, Ni 13.4 %, Cr 22.5 %, Mo 2.8 %, N 0.09 %
• Deposition Data (example 4.0 × 350 mm): 85‑180 A, 31 V, 61 % efficiency, 56 s fusion time, 2.0 kg/h

Applications

• Welding of acid‑resistant stainless steels to carbon steel structures.
• Fabrication of buffer layers for corrosion‑resistant cladding.
• General purpose SMAW where flexibility and portability are required.