UNS/CDA C71581
Cupro Nickel

 


Specifications

AWS A5.7 Class ERCuNi
MIL-E-21562 Type MIL-RN67, MIL EN67
ASME SFA5.7, Class ERCuNi
QQ-R-571C MIL-R-19631B Type MIL-RcuNi
MIL-1-23413 (MIL-67)

Description
ERCuNi is a copper-nickel filler metal used for MIG, TIG, oxyacetylene and submerged arc welding of wrought or cast 70/30, 80/20 and 90/10 copper-nickel to themselves or to each other. Excellent for joining copper-nickel alloys to nickel-copper Alloy 400, R-405, K-500 or high nickel alloy 200. Note:  ERCuNi can be used for overlaying on steel, however a barrier layer of   61 should be used for the first pass when MIG welding.

Chemical Composition
(%max., unless shown as range or min.)

 

Cu(1)

Fe

Pb

Mn

Ni(2)

Min./Max.

Rem.

.40-.7

.02

1.0

29.0-32.0

Nominal

-

.55

-

-

30.5

(1) Cu value includes Ag.
(2) Ni value includes Co.
Note: .02 .25 .01 .02 - .50% Ti.
Note: Cu + Sum of Named Elements, 99.5% min.