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OK 76.28
SMAW
Type Basic
OK 76.28 is an LMA electrode for welding creep-resistant steels containing approx. 2.25Cr1Mo. The electrode runs with a quiet, stable arc and produces a minimum of spatter loss. OK 76.28 deposits a weld metal with good cracking resistance. The scaling temperature of the weld metal is about 625°C.
Welding current, A
DC(+-)
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| Classifications | Approvals | Typical all weld metal composition | Typical properties all weld metal | | SFA/AWS A5.5 | | E9018-B3 | | EN 1599 | | ECrMo2 B 42 H5 |
| | ABS | SR | |
| BV | UP | |
| CL | | |
| DS | EN 1599 | |
| Sepros | UNA 485155 | |
| SFS | EN 1599 | |
| SS | EN 1599 | |
| UDT | DIN 8575 | |
| VdTÜV | | |
| | C | 0,07 | | Si | 0,3 | | Mn | 0,6 | | Cr | 2,2 | | Mo | 1,0 |
| Redrying temperature, °C
350
Redrying time, hours
2
Recovery
115%
Yield stress, MPa
550
Tensile strength, MPa
650
Elongation, %
18
Elongation, %
18
| Charpy V | | Test temps, °C | Impact values, J | | +20 | 50 | | -20 | 25 |
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| Diameter, mm | 2,0 | 2,5 | 3,2 | 3,2 | 4,0 | 4,0 | 5,0 | 6,0 | | Length, mm | 300 | 300 | 350 | 450 | 350 | 450 | 450 | 450 | | Arc voltage, V | 23 | 25 | 26 | - | - | 28 | 29 | 30 | | Welding current, A | 55-80 | 70-110 | 95-150 | 95-140 | 130-190 | 130-190 | 150-260 | 200-350 | | N. Kg weld metal/kg electrodes | 0,58 | 0,58 | 0,59 | - | - | 0,64 | 0,64 | 0,64 | | B. No. of electrodes/kg weld metal | 136,0 | 88,0 | 49,0 | - | - | 23,0 | 14,5 | 10,5 | | H. Kg weld metal/hour arc time | 0,7 | 0,8 | 1,2 | - | - | 1,8 | 2,7 | 3,9 | | T. Burn-off time, secs/electrode | 40 | 52 | 62 | - | - | 88 | 92 | 90 |
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