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OK 73.68
SMAW
Type Basic
OK 73.68 is a 2.5% nickel-alloyed LMA electrode suitable for 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.
Welding current, A
AC, DC+ OCV 65 V
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| Classifications | Approvals | Typical all weld metal composition | Typical properties all weld metal | | SFA/AWS A5.5 | | E8018-C1 | | EN ISO 2560-A | | E 46 6 2Ni B 32 H5 |
| | ABS | 3H5, 3Y400 | |
| BV | 5Y40M H5 | |
| DNV | 5 YH10 | |
| GL | 6Y55H10 | |
| LR | 5Y40H5 | |
| PRS | 4YH10 | |
| RS | 3YHH | |
| Sepros | UNA 409819 | |
| VdTÜV | 01529 | |
| CE | EN 13479 | |
| | C | 0,05 | | Si | 0,3 | | Mn | 1,0 | | Ni | 2,4 | | P | ³0,02 | | S | ³0,02 | | Cr | ³0,1 | | Mo | ³0,05 | | V | ³0,03 | | Nb | ³0,02 | | Cu | ³0,1 | | Al | ³0,03 | | Sn | ³0,01 | | Ti | ³0,03 | | Pb | ³0,02 | | As | ³0,03 |
| Redrying temperature, °C
350
Redrying time, hours
2
Recovery
120%
Yield stress, MPa
520
Tensile strength, MPa
610
Elongation, %
26
Elongation, %
26
| Charpy V | | Test temps, °C | Impact values, J | | -55 | 110 | | -59 | 105 | | -60 | 105 | | |
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| Diameter, mm | 2,0 | 2,5 | 3,2 | 4,0 | 5,0 | | Length, mm | 300 | 350 | 450 | 450 | 450 | | Arc voltage, V | 21 | 23 | 23 | 23 | 27 | | Welding current, A | 55-75 | 70-110 | 105-150 | 140-190 | 190-270 | | N. Kg weld metal/kg electrodes | 0,62 | 0,62 | 0,62 | 0,65 | 0,65 | | B. No. of electrodes/kg weld metal | 130,0 | 70,0 | 32,0 | 21,0 | 13,5 | | H. Kg weld metal/hour arc time | 0,6 | 0,9 | 1,4 | 2,0 | 2,5 | | T. Burn-off time, secs/electrode | 46 | 55 | 81 | 88 | 104 |
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