Copper Nickel Resistance Alloys

Uses

CuNi2Very low electrical resistivity, solderableTerminals, low-resistance, electrical resistors, heating cables with low heating temperature
CuNi6Low electrical resistivity, solderable
CuNi10Low electrical resistivity, corrosion and scaling resistance, solderable
CuNi151  
CuNi23MnGood corrosion and scaling resistance, solderableElectrical resistors, heating wires, heating cables
CuNi30MnGood corrosion and scaling resistance, solderableElectrical resistors, starters, indicators
CuNi44Good cold and hot workability, small temperature coefficient of electrical resistance, good corrosion and scaling resistanceStarting, regulating, control and load resistors to DIN 17471; thermocouples, heating elements,tube mounting material

1 Non-standard electrical resistance alloy not in DIN 17471:1983

With its resistivity of 0.21Ω.mm2/m it fits well in the gap between CuNi10 with 0.15Ω.mm2/m and CuNi23Mn with 0.30Ω.mm2/m

 

Composition

 Identification symbol in accordance with DIN 17471 Material Number Mean Composition (Mass %)
CuNi22.08022 Ni; Rem. Cu
CuNi62.08076 Ni; Rem; Cu
CuNi102.081110 Ni; Rem. Cu
CuNi23Mn2.088123 Ni; 1.5 Mn; Rem. Cu
CuNi30Mn2.089030 Ni; 3 Mn; Rem. Cu
CuNi44*2.084244 Ni; 1 Mn; Rem. Cu
* This alloy is also standardized in DIN 17664 as CuNi44Mn1   

 

Physical properties (guide values)

Identification symbol DIN 17471Density at 20°C ρ20 kg/dm3Solidus temp °CSpecific heat at 20°C J/(g . K)Thermal conductivity at 20°C W/(m . K)Mean of coefficient expansionThermo-electric voltage versus copper μV/K
(20 to 100°C) 10-6/K(20 to 400°C) 10-6/K
 CuNi2 8.9 1090 0.38 130 16.5 17.5 -15
 CuNi6 8.9 1095 0.38 92 16 17.5 -20
 CuNi10 8.9 1100 0.38 59 16 17.5 -25
 CuNi23Mn 8.9 1150 0.37 33 16 17.5 -30
 CuNi30Mn 8.8 1180 0.40 25 14.5 16 -25
 CuNi44 8.9 1230-12901 0.41 23 13.5 15 -40
        1 Melting range

 

Electrical resistivity in annealed condition and upper application temperatures (guide values)

Identification symbol DIN 17471Electrical resistivity in Ω . mm2/mTemperature coefficient of electrical resistance between 20 and 105°C 10-6/KUpper application limit in air °C
20°C100°C200°C300°C400°C500°C
CuNi20.0510.0570.064---+1000 to +1600300
CuNi60.1010.1070.1140.123--+500 to +900300
CuNi100.1510.1560.1620.1690.175-+350 to +450400
CuNi23Mn0.3020.3080.3150.3230.3310.339+220 to +280500
CuNi30Mn0.4020.4040.4100.4170.4240.432+80 to +130500
CuNi440.4920.490.490.490.490.49-80 to +40600

1 Allowable deviation 10%

2 Allowable deviation 5%

 

Mechanical properties at 20°C in annealed condition

  Identification symbolTensile strength1 Rm N/mm2 min.  Elongation (Lo = 100 mm) A % for nominal diameter in mm     
0.02 to 0.0632  >0.063 to 0.1252>0.125 to 0.52 >0.5 to 1 >13 
CuNi2220-approx. 15approx. 18≥18≥25
CuNi6250-approx. 15approx. 18≥18≥25
CuNi10290-approx. 15approx. 20≥20≥25
CuNi23Mn350approx. 12approx. 18approx. 20≥20≥25
CuNi30Mn400approx. 12approx. 18approx. 20≥20≥25
CuNi44*420approx. 12approx. 18approx. 20≥20≥25

1 Values are applicable to wire with diameter more than 2 mm; values are substantially higher for smaller diameters. Values also apply to flat wire and strip whose thickness is equal to diameter.

2 Only guide values.

3 Measurement length Lo can be agreed for wire diameters more than 3 mm.