Opis
OK 74.78 is an electrode for welding high-strength steels used for constructions working at low temperatures. Metal welds have good impact properties at temperatures up to -40°C. This electrode is suitable for welding and hardfacing of rails where a hardness of 250 HV is required. The moisture content of the cover is very small, so that the OK 74.78 electrode becomes useful when preheating is not possible. Welded material S420-S550 to STE420-STE550. Covering: alkaline
| Chemical composition [%] | Mechanical properties | Welding positions | Welding current | Authorizations | Dimensions [ø mm] | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| C = 0,06 Si = 0,35 Mn = 1,50 Mo = 0,40 |
Re [MPa] > 600 Rm [MPa] = 650 A5 = 25% KV[J] = 60 (-60°C) |
 |
= ± | ~ | ABS, BV, DB, DNV, LR, TÜV |
2,0 | 2,5 | 3,25 | |||
| 4,0 | 5,0 | 6,0 | ||||||||
