DAIKOSTRIP 413

ESW, SAW
  • COPPER ALLOYS
CuNi 70-30

Description

Strip designed for submerged-arc strip cladding of 70Cu 30Ni Alloy.
• This strip is used for multilayer cladding. In case of cladding on C-steel, a buffer layer with DAIKOSTRIP 418 is necessary.
Specifications
AWS A5.7
EQCuNi
Shielding
DAIKOFLUX 940, 942AS, 944
Positions
PA
Current
DC+
Packaging Type
Coils Standard 30x05mm 60x05mm 90x05mm Weight 25 300kg width and specific weights available on request
Asme qualifications
F-No (QW432)
34
A-No (QW442)
-

Hardness

100HB
Chem. Comp. %
0
Mn
0.8
Ni
31
Cr
0.025
Si
0.1
Fe
0.7
Ti
0.3
Mechanical Properties
min
variant
Tensile strength Rm MPa
345
420
Yield strength Rp0.2 MPa
-
230
Elongation A (L0=5d0) %
0
34
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
Description

Application

The CuNi 70-30 consumable is particularly suitable for overlay and cladding operations, provided a buttering layer is created. This is commonly done using alloy 400 or pure nickel. The 70/30 consumables are ideal for welding 70/30, 80/20, and 90/10 base materials. They match the 70/30 base materials in terms of strength and color, and allow for overmatched welding on 90/10 alloys for optimal strength. This material is widely used in offshore constructions, desalination plants, evaporators, condensers, and systems for treating saline and marine water. No preheat is required, and the maximum interpass temperature is 150°C, with no need for PWHT. It is crucial to avoid contamination in the weld area with foreign materials, particularly sources of lead, tin, or zinc, to prevent cracking in the weld metal.

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)

Welding & PWHT

Particularly suitable for welding applications that require high resistance to corrosion in aggressive environments. This includes systems exposed to saline and seawater, where long-term durability is critical.

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