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OK 67.50
SMAW
Type Rutile-acid
OK 67.50 is a rutile-coated electrode for welding ferritic austenitic stainless steels, e.g. UNS S31803. Special applications are welding of pipes with high resistance to stress corrosion up to 300°C, the so called Duplex steels. OK 67.50 is particularly suitable for welding duplex cargo tanks.
Welding current, A
DC+, AC OCV 60 V
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| Classifications | Approvals | Typical all weld metal composition | Typical properties all weld metal | | EN 1600 | | E 22 9 3 N L R 3 2 | | SFA/AWS A5.4 | | E2209-17 | | Werkstoff Nr. | | 1.4462 | | CSA W48 | | E2209-17 |
| | ABS | For welding duplex steels | |
| BV | 2209 | |
| CWB | CSA W48 | |
| DNV | For duplex SS | |
| GL | 4462 | |
| RINA | 2209 | |
| Sepros | UNA 409820 | |
| VdTÜV | 04368 | |
| CE | EN 13479 | |
| | C | <0,03 | | Si | 0,7 | | Mn | 0,9 | | Cr | 22,3 | | Ni | 9,5 | | Mo | 3,0 | | Cu | <0,3 | | N | 0,16 |
| Redrying temperature, °C
350
Redrying time, hours
2
Recovery
0-108
Yield stress, MPa
660
Tensile strength, MPa
857
Elongation, %
25
Elongation, %
25
Ferrite content
FN 25-40
| Charpy V | | Test temps, °C | Impact values, J | | +20 | 50 | | -30 | 41 |
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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 | 29 | 27 | 28 | 29 | 30 | | Welding current, A | 30-65 | 50-90 | 80-120 | 100-160 | 150-220 | | N. Kg weld metal/kg electrodes | 0,55 | 0,58 | 0,58 | 0,58 | 0,58 | | B. No. of electrodes/kg weld metal | 152 | 91 | 47 | 32 | 20 | | H. Kg weld metal/hour arc time | 0,7 | 1,0 | 1,4 | 1,9 | 2,8 | | T. Burn-off time, secs/electrode | 33 | 38 | 55 | 59 | 64 |
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