OK 68.55 SMAW Type Basic E 25 9 4 N L B 4 2 Description OK 68.55 is a basic coated electrode for welding austenitc-ferritic steels of the Super Duplex type, e. g. SAF 2507 and Zeron 100. OK 68.55 deposits a weld metal with high ductility. Welding current DC+ Corrosion data ASTM A-262 Practice B: 0.24mm/year Practice C: 0.20mm/year NACE TM 01-77: Stress level: 770 MPa Time to fracture (h): >720 ASTM G48-76: 60ºC
Classifications EN 1600 E 25 9 4 N L B 4 2 Werkstoff Nr. (1.4410) Typical all weld metal composition, % C Si Mn Cr Ni Mo N <0.04 0.5 0.8 25.3 9.8 4.0 0.25 Typical mech. properties all weld metal Yield stress, MPa 700 Tensile strength, MPa 900 Elongation A5, % 28 Charpy V Ferrite content FN 35-50 Test temps, °C Impact values, J +20 90 -20 70 -40 55 -60 45 Approvals UDT EN 1600
