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OK 67.70
SMAW
Type Rutile-acid
OK 67.70 is an over-alloyed, stainless steel electrode for use as a buffer layer in welding acid-resistant clad steels and stainless steels to other types of steel. OK 67.70 has outstanding welding properties on both AC and DC. The electrode can be used in all positions except vertical down.
Welding current, A
DC+, AC OCV 55 V
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| Classifications | Approvals | Typical all weld metal composition | Typical properties all weld metal | | EN 1600 | | E 23 12 2 L R 3 2 | | SFA/AWS A5.4 | | E309MoL-17 | | Werkstoff Nr. | | 1.4459 | | CSA W48 | | E309LMo-17 |
| | ABS | SS to C&C/Mn steels | |
| CWB | CSA W48 | |
| DB | 30.039.05 | |
| DNV | 309 Mo | |
| LR | SS/CMn | |
| RINA | E 309Mo | |
| Sepros | UNA 409820 | |
| VdTÜV | 02424 | |
| CL | EN 1600 | |
| BV | UP | |
| CE | EN 13479 | |
| | C | <0,03 | | Si | 0,7 | | Mn | 0,9 | | Cr | 23,0 | | Ni | 13,0 | | Mo | 2,8 | | Cu | <0,3 |
| Redrying temperature, °C
350
Redrying time, hours
2
Recovery
120
Yield stress, MPa
510
Tensile strength, MPa
610
Elongation, %
32
Elongation, %
32
Ferrite content
FN 12-22
| Charpy V | | Test temps, °C | Impact values, J | | +20 | 50 | | -20 | > 32 |
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| Diameter, mm | 2,0 | 2,5 | 3,2 | 4,0 | 5,0 | 5,0 | | Length, mm | 300 | 300 | 350 | 350 | 350 | 450 | | Arc voltage, V | 26 | 29 | 27 | 31 | 30 | 30 | | Welding current, A | 40-60 | 50-90 | 60-120 | 85-180 | 110-250 | 110-240 | | N. Kg weld metal/kg electrodes | 0,58 | 0,57 | 0,59 | 0,61 | 0,59 | 0,57 | | B. No. of electrodes/kg weld metal | 147 | 94 | 47 | 32 | 20 | 15 | | H. Kg weld metal/hour arc time | 0,6 | 0,9 | 1,4 | 2,0 | 2,7 | 2,7 | | T. Burn-off time, secs/electrode | 48 | 45 | 61 | 56 | 64 | 85 |
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