CuNi 70-30
Application
Suitable for surfacing and cladding, provided there is an appropriate buttering layer, typically either alloy 400 or pure nickel. The 70/30 consumables are applicable for welding 70/30, 80/20, and 90/10 base materials. Matching the strength and color of the 70/30 base materials, they also exhibit overmatching strength compared to the 90/10 alloys. Applications include offshore construction, desalination plants, evaporators, condensers, etc., in salt and seawater processing systems. Preheating is not usually required, with a maximum interpass temperature of 150°C and no post-weld heat treatment (PWHT). It's crucial to meticulously avoid any contamination of the weld zone with foreign materials, especially sources of lead, tin, or zinc, to prevent weld metal cracking.
Alloy Type
70/30 copper-nickel alloys.
Microstructure
Solid solution, single phase alloy.
Materials
- EN W.Nr.: 2.0872 (CuNi10Fe), 2.0882 (CuNi30Mn1Fe), 2.0883 (CuNi30Fe2Mn2)
- ASTM: C71500, C96400 (cast)
- UNS: C71500, C96400, C70600, C96200
- PROPRIETARY: Cunifer 30 (VDM), Cunifer 10 (VDM), Osna®-30 (KME), Osna®-10 (KME)
Products of the line CuNi 70-30
| Product name | Process | AWS specifications | EN ISO specifications | |
| DAIKOWM 413 | GMAW |
AWS A5.7
ERCuNi |
EN ISO 24373
S Cu 7158 / CuNi30Mn1FeTi |
|
| DAIKOWT 413 | GTAW |
AWS A5.7
ERCuNi |
EN ISO 24373
S Cu 7158 / CuNi30Mn1FeTi |
|
| DAIKO 187 | SMAW |
AWS A5.6
ECuNi |
- | |
| G-TECH 413 | SMAW |
AWS A5.6
ECuNi |
- | |
| DAIKOSTRIP 413 | ESW SAW |
AWS A5.7
EQCuNi |
- |
