OK 73.68
OK 73.68 is a 2.5% nickel-alloyed LMA electrode suitable for the welding of low-alloy steels with impact requirements down to -60°C. The composition of the weld metal is such that good, low-temperature impact properties are obtained, even when welding vertically up. The weld metal of OK 73.68 is also noted for its good corrosion resistance to sea-water and sulphuric acid fumes.
Typical Tensile Properties
| ISO As welded | ||||
| Elongation | Tensile Strength | Yield Strength | Stress Relieved Temperature | Stress Relieved Testing Time |
| 28 % | 615 MPa | 540 MPa | – | – |
| AWS Stress relieved | ||||
| Elongation | Tensile Strength | Yield Strength | Stress Relieved Temperature | Stress Relieved Testing Time |
| 28 % | 600 MPa | 500 MPa | 620 °C | 1 hr |
Typical Charpy V-Notch Properties
| ISO As welded | |||
| Impact Value | Testing Temperature | Stress Relieved Testing Temp | Stress Relieved Testing Time |
| 105 J | -60 °C | – | – |
| 65 J | -80 °C | – | – |
| AWS Stress relieved | |||
| Impact Value | Testing Temperature | Stress Relieved Testing Temp | Stress Relieved Testing Time |
| 85 J | -60 °C | 620 °C | 1 hr |
Typical Weld Metal Analysis %
| Mn | Mo | C | Si | Ni | Cr |
| 1 % | 0.01 % | 0.05 % | 0.35 % | 2.4 % | 0.02 % |
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 350 mm | 70-110 A | 0.90 kg/h | 55 sec | 0.62 kg | 70.0 | 23 V |
| 3.2 x 450 mm | 105-150 A | 1.40 kg/h | 81 sec | 0.62 kg | 32.0 | 23 V |
| 5.0 x 450 mm | 190-270 A | 2.50 kg/h | 104 sec | 0.65 kg | 13.5 | 27 V |
| 4.0 x 450 mm | 140-190 A | 2.00 kg/h | 88 sec | 0.65 kg | 21.0 | 23 V |
| Approvals: | ABS, 3Y400 H5*, ABS, E 8018-C1, BV, 5Y40M H5*, CE, EN 13479, DNV-GL, 5 Y46H5, LR, 5Y42m H5*, NAKS/HAKC, 2.5-5.0 mm, PRS, 5Y 42 H5, RS, 5Y46M H5*, Seproz, UNA 272580, VdTÜV, 01529 |
| Classifications: | SFA/AWS A5.5, E8018-C1, EN ISO 2560-A, E 46 6 2Ni B 32 H5 |
Approvals are based on factory location. Please contact ESAB for more information.
| Alloy Type: | Low alloyed (2.5 % Ni) |
| Coating Type: | IMPERIAL_Basic covering |
| Diffusible Hydrogen: | < 5.0 ml/100g |
| Welding Current: | AC, DC+ |