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OK 68.81
SMAW
Type Rutile-acid
OK 68.81 is a high-alloyed electrode which deposits a ferritic-austenitic duplex weld metal with approx. 40% ferrite. Resistant to stress corrosion and highly insensitive to dilution. Good scaling resistance up to 1150°C. OK 68.81 is used for joining dissimilar steels, steels with reduced weldability and buffer layers prior to hardfacing. Applications: rolls, forging dies, hot-work tools, dies for plastics and so on.
Welding current, A
DC+, AC OCV 60 V
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| Classifications | Approvals | Typical all weld metal composition | Typical properties all weld metal | | SFA/AWS A5.4 | | E312-17 | | EN 1600 | | E 29 9 R 3 2 | | Werkstoff Nr. | | 1.4337 |
| | | C | 0,12 | | Si | 0,7 | | Mn | 0,8 | | Cr | 29,0 | | Ni | 9,8 | | Mo | <0,5 | | Cu | <0,3 |
| Redrying temperature, °C
350
Redrying time, hours
2
Yield stress, MPa
610
Tensile strength, MPa
790
Elongation, %
22
Elongation, %
22
Ferrite content
FN 50-80
Weld metal hardness, a w
220-240 HV
Machinability
Fair
| Charpy V | | Test temps, °C | Impact values, J | | +20 | 30 |
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| Diameter, mm | 2,0 | 2,5 | 3,2 | 4,0 | 5,0 | | Length, mm | 300 | 300 | 350 | 350 | 350 | | Arc voltage, V | 22 | 24 | 25 | 26 | 28 | | Welding current, A | 40-60 | 50-85 | 60-125 | 80-175 | 150-240 | | N. Kg weld metal/kg electrodes | 0,64 | 0,64 | 0,62 | 0,62 | 0,65 | | B. No. of electrodes/kg weld metal | 123,0 | 78,0 | 42,0 | 26,0 | 16,5 | | H. Kg weld metal/hour arc time | 0,7 | 0,9 | 1,3 | 2,0 | 3,2 | | T. Burn-off time, secs/electrode | 41 | 48 | 65 | 66 | 68 |
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