OK 75.78

OK 75.78 is a high‑strength low‑alloy stick electrode designed for steels with tensile strengths over 900 MPa and impact values above 47 J at –60 °C.

Key Features

• Provides tensile strength > 900 MPa and impact energy > 47 J at –60 °C
• VacPac™ hermetically sealed, vacuum‑packed packaging for moisture‑free storage
• Straight‑from‑the‑pack use; no re‑baking required
• Basic coating on a CrNiMo alloy core

Specifications

• Classifications: EN ISO 18275‑A : E 89 6 Z B 32 H5
• Welding Current: AC, DC+
• Diffusible Hydrogen: 4.0 ml/100 g
• Alloy Type: CrNiMo
• Coating Type: Basic
• Minimum AC Open‑Circuit Voltage: 65 V
• Tensile Yield Strength: 922 MPa (As Welded, ISO)
• Tensile Strength: 974 MPa (As Welded, ISO)
• Elongation: 19 % (As Welded, ISO)
• Charpy Impact (–60 °C, As Welded, ISO): 47 J
• Typical Weld Metal Composition: C 0.052 %, Mn 1.91 %, Si 0.30 %, Ni 3.23 %, Cr 0.52 %, Mo 0.63 %
• Deposition Data (Diameter – Amps – Volts – Efficiency – Fusion Time – Deposition Rate):
  • 2.5 × 350 mm: 70‑110 A, 24 V, 61 %, 52 s, 0.9 kg/h
  • 3.2 × 350 mm: 110‑150 A, 24 V, 63 %, 77 s, 1.4 kg/h
  • 4.0 × 450 mm: 150‑200 A, 24 V, 65 %, 86 s, 1.9 kg/h

Applications

• Structural steel welding requiring high tensile and impact performance
• Cold‑temperature service (down to –60 °C)
• Projects needing reliable, moisture‑free electrodes straight from the pack