CuNi44 Resistance Alloy Wire Low TCR ±20 Ppm/°C Compliant
Constantan(OhmAlloy049.pdf)
(Common Name: CuNi44,.Cuprothal49, Alloy 294, Cuprothal 294, Alloy
49, CuNi 102, Cu-Ni 44, Konstantan, Constantan.)
OhmAlloy049 is a copper-nickel alloy (Cu56Ni44 alloy) characterized
by high electrical resistance, high ductility and good corrosion
resistance. It is suitable for use at temperatures up to 400°C
Typical applications for OhmAlloy49 are temperature-stable
potentiometers, industrial rheostats and electric motor starter
resistances.
Copper Nickel Alloy Production Standard(GB/T1234-95)
| Performance Brand | NC020
CuNi14 | NC025
CuNi19 | NC030
CuNi23 | NC035
CuNi30 | NC040
CuNi34 | NC050
CuNi44 |
| Main Chemical Content％ | Ni | 14.2 | 19 | 23 | 30 | 34 | 44 |
| Mn | 0.3 | 0.5 | 0.5 | 1.0 | 1.0 | 1.0 |
| Cu | Bal. | Bal. | Bal. | Bal. | Bal. | Bal. |
| Element Max Working Temperature℃ | 300 | 300 | 300 | 350 | 350 | 400 |
| Density g/cm3 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 |
| Resistivity Ωmm2/m, at 20℃ | 0.20±5％ | 0.25±5％ | 0.30±5％ | 0.35±5％ | 0.40±5％ | 0.49±5％ |
Temperature factor of resistivity 10-5/℃(200-600℃) | <38 | <25 | <16 | <10 | -0 | <-6 |
| Melting Point ℃ | 1115 | 1135 | 1150 | 1170 | 1180 | 1280 |
| Tensile Strength MPa | ≥310 | ≥340 | ≥350 | ≥400 | ≥400 | ≥420 |
| Enlogation%(>1.0) | ≥25 | ≥25 | ≥25 | ≥25 | ≥25 | ≥25 |
EMF VS Copper
V/℃(0-100℃) | -28 | -32 | -34 | -37 | -39 | -43 |
| Specific heat capacity j/gk(20℃) | 0.38 | 0.38 | 0.38 | 0.39 | 0.40 | 0.41 |
| Conductivity coefficient w/mk at20℃ | 48 | 38 | 33 | 27 | 25 | 23 |
| Organizational attribute | Austenitic | Austenitic | Austenitic | Austenitic | Austenitic | Austenitic |
| Magnetic | None-Magnetic | None-Magnetic | None-Magnetic | None-Magnetic | None-Magnetic | None-Magnetic |
Corrosion resistance performance
| Alloys | Working In atmosphere at 20℃ | Working at max temperature 200℃ | |
Air and oxygen contain gases | gases with Nitrogen | gases with sulfur oxidability | gases with sulfur reductibility | carburization |
| OhmAlloy049 | good | good | good | good | bad | good |
Style of supply
| Alloys Name | Type | Dimension | |
| OhmAlloy049W | Wire | D=0.06mm~8mm | |
| OhmAlloy049R | Ribbon | W=0.4~40 | T=0.05~2.9mm |
| OhmAlloy049S | Strip | W=8~200mm | T=0.1~3.0 |
| OhmAlloy049F | Foil | W=6~120mm | T=0.005~0.1 |
| OhmAlloy049B | Bar | Dia=8~100mm | L=50~1000 |
The addition of nickel to pure copper can significantly improve the
strength, corrosion resistance, hardness, electrical resistance and
thermoelectricity, and reduce the temperature coefficient of
resistivity. Therefore, compared with other copper alloys, the
mechanical and physical properties of cupronickel are extremely
good, with good ductility, high hardness, beautiful color,
corrosion resistance and deep drawing performance.
It is widely used as corrosion-resistant structural parts in
shipbuilding, petroleum, chemical, construction, electric power,
precision instruments, medical equipment, musical instruments and
other departments. Some cupronickel has special electrical
properties, which can be used to make resistance elements,
thermocouple materials and compensation wires. Non-industrial
cupronickel is mainly used to make decorative crafts.
