DAIKOWT 413

GTAW
  • COPPER ALLOYS
CuNi 70-30

Description

70/30 copper-nickel solid rod
The weld metal of this wire rod is designed to match the CuNi 70/30 alloys and is nominally 67% Cu and 30% Ni. The consumable is suitable for surfacing and cladding provided buffer layer is made (normally buttering is made with alloy 400 or pure nickel). Applications include offshore construction, desalination plant, evaporators, condenser, etc, in salt and sea water processing system.
Specifications
ISO 24373
S Cu 7158 / CuNi30Mn1FeTi
AWS A5.7
ERCuNi
DIN 1733
SG-CuNi30Fe
Shielding
I1
Positions
PA, PB, PC, PD, PE, PF
Current
DC-
Packaging Type
5kg carton tube
Asme qualifications
F-No (QW432)
34
A-No (QW442)
-

Hardness

80HV - 110HV
Chem. Comp. %
DEFAULT
Mn
0.8
Ni
31
P
0.003
S
0.005
Si
0.01
Fe
0.5
Ti
0.3
Pb
0.001
Mechanical Properties
min
variant
Tensile strength Rm MPa
345
400
Yield strength Rp0.2 MPa
-
200
Elongation A (L0=5d0) %
0
38
Impact Charpy ISO-V
-
200J @ 20°C
Impact Charpy ISO-V
-
-
Welding Parameters
1.6 mm
2.4 mm
Ampere
110A - 150A
175A - 250A
Voltage
-
-
Packaging
Ø 1,6÷4,0 mm
Ø 1,6÷4,0 mm
Packaging Type
5kg carton tube
5kg carton tube
Description

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).

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