OK 78.16
OK 78.16 is a CrMo-alloyed electrode for the welding of 0.25C-1Cr-0.3Mo-alloyed quenched and tempered steel grades. The heat treatment requirements for the weld metal are the same as those for the parent plate. The weld metal of OK 78.16 is also suitable for flame hardening. The welding of high tensile strength steel with OK 78.16 should be carried out at a preheating temperature of minimum 200°C.
Typical Tensile Properties
| ISO As welded | ||
| Elongation | Tensile Strength | Yield Strength |
| 17 % | 900 MPa | 800 MPa |
| AWS As welded | ||
| Elongation | Tensile Strength | Yield Strength |
| – | – | – |
Typical Charpy V-Notch Properties
| ISO As welded | |
| Impact Value | Testing Temperature |
| 80 J | 20 °C |
Typical Weld Metal Analysis %
| Mn | Mo | C | Si | Cr |
| 0.76 % | 0.2 % | 0.17 % | 0.52 % | 1.15 % |
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 | 75-100 A | 0.90 kg/h | 58 sec | 0.64 kg | 70.0 | 20 V |
| 3.2 x 450 mm | 105-140 A | 1.40 kg/h | 78 sec | 0.64 kg | 32.5 | 21 V |
| 5.0 x 450 mm | 190-260 A | 2.80 kg/h | 86 sec | 0.68 kg | 15.0 | 23 V |
| 4.0 x 450 mm | 145-195 A | 1.90 kg/h | 83 sec | 0.66 kg | 22.5 | 22 V |
| Approvals: | CE, EN 13479, Seproz, UNA 272581 |
| Classifications: | SFA/AWS A5.5, E9018-G, EN ISO 18275-A, E 69 A Z B 42 |
Approvals are based on factory location. Please contact ESAB for more information.
| Alloy Type: | Low alloyed (1.15 % Cr ; 0.2 % Mo) |
| Coating Type: | IMPERIAL_Basic covering |
| Welding Current: | DC+ |