OK 68.81
OK 68.81 is a high-alloyed electrode which deposits a ferritic-austenitic duplex weld metal with approx. 40% ferrite. It is resistant to stress corrosion and is highly insensitive to dilution. Good scaling resistance up to 1150°C. OK 68.81 is used for joining dissimilar steels, steels with reduced weldability and buffer layers prior to hardfacing. Applications: rolls, forging dies, hot-work tools, dies for plastics and so on.
Typical Tensile Properties
| ISO As welded | ||
| Elongation | Tensile Strength | Yield Strength |
| – | – | – |
| AWS As welded | ||
| Elongation | Tensile Strength | Yield Strength |
| 25 % | 790 MPa | 610 MPa |
Typical Charpy V-Notch Properties
| AWS As welded | |
| Impact Value | Testing Temperature |
| 30 J | 20 °C |
Typical Weld Metal Analysis %
| Mn | Mo | C | Si | Ferrite FN | Ni | N | Cr |
| 0.9 % | 0.04 % | 0.13 % | 0.7 % | 40 % | 10.2 % | 0.09 % | 28.9 % |
Deposition Data
| Diameter | Current | Deposition Rate | Fusion time per electrode at 90% I max | kg weld metal/kg electrodes | Number of electrodes/kg weld metal | Voltage |
| 2.5 x 300 mm | 50-85 A | 0.9 kg/h | 48 sec | 0.64 kg | 78 | 24 V |
| 4.0 x 350 mm | 80-175 A | 2.0 kg/h | 66 sec | 0.62 kg | 26 | 26 V |
| 3.2 x 350 mm | 60-125 A | 1.3 kg/h | 65 sec | 0.62 kg | 42 | 25 V |
| 5.0 x 350 mm | 150-240 A | 3.2 kg/h | 68 sec | 0.65 kg | 17 | 28 V |
| 2.0 x 300 mm | 40-60 A | 0.7 kg/h | 41 sec | 0.64 kg | 123 | 22 V |
| Approvals: | CE, EN 13479, Seproz, UNA 272580 |
| Classifications: | EN 14700, E Fe11, EN ISO 3581-A, E 29 9 R 3 2, SFA/AWS A5.4, VAT, Werkstoffnummer, 1.4337 |
Approvals are based on factory location. Please contact ESAB for more information.
| Alloy Type: | IMPERIAL_Stainless duplex |
| Coating Type: | Acid Rutile |
| Ferrite Content: | FN 30 – 50 |
| Welding Current: | DC+, AC |
