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OK 68.55
SMAW
Type Basic
OK 68.55 is a coated electrode for welding austenite ferrite steels of Super Duplex type, e.g. SAF 2507 and Zeron 100. OK 68.55 deposits a weld metal with high ductility.
Welding current, A
DC+
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| Classifications | Approvals | Typical all weld metal composition | Typical properties all weld metal | | EN 1600 | | E 25 9 4 N L B 4 2 | | Werkstoff Nr. | | (1.4410) |
| | | C | <0,04 | | Si | 0,5 | | Mn | 0,8 | | Cr | 25,3 | | Ni | 9,8 | | Mo | 4,0 | | N | 0,25 |
| Redrying temperature, °C
250
Redrying time, hours
2
Recovery
107-109
Yield stress, MPa
700
Tensile strength, MPa
900
Elongation, %
28
Elongation, %
28
Ferrite content
FN 35-50
| Charpy V | | Test temps, °C | Impact values, J | | +20 | 90 | | -20 | 70 | | -40 | 55 | | -60 | 45 |
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| Diameter, mm | 2,5 | 3,2 | 4,0 | | Length, mm | 300 | 350 | 350 | | Arc voltage, V | 23 | 23 | 23 | | Welding current, A | 50-80 | 60-100 | 100-140 | | N. Kg weld metal/kg electrodes | 0,62 | 0,63 | 0,62 | | B. No. of electrodes/kg weld metal | 93 | 46 | 32 | | H. Kg weld metal/hour arc time | 0,8 | 1,10 | 1,60 | | T. Burn-off time, secs/electrode | 48 | 68 | 70 |
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