6J40 constantan wire for resistor carbon film resistor wire-wound
resistor
Constantan( Ohmalloy 049)
(Common Name: CuNi45, NC50.Cuprothal, Alloy 294, Cuprothal 294,
Nico, MWS-294, Cupron, Copel, Alloy 45, Neutrology, Advance, 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.
The combination of negligible temperature coefficient and high
resistivity makes the alloy particulary suitable for the winding of
precision resistors.
OhmAlloy049 is manufactured from electrolytic copper and pure
nickel. In finer wire sizes the alloy is designated as
OhmAlloy49TC(Thermocouple).
Normal composition%
| Nickel | 45 | Manganese | 1 |
| Copper | Bal. | | |
Typical Mechanical properties(1.0mm)
| Yield strength | Tensile Strength | Elongation |
| Mpa | Mpa | % |
| 250 | 420 | 25 |
Typical Physical properties
| Density (g/cm3) | 8.9 |
| Electrical resistivity at 20℃ (Ωmm2/m) | 0.49 |
| Temperature factor of resistivity(20℃~600℃)X10-5/℃ | -6 |
| Conductivity coefficient at 20℃ (WmK) | 23 |
| EMF vs Cu(μV/℃ )(0~100℃ ) | -43 |
| Coefficient of thermal expansion |
| Temperature | Thermal Expansion x10-6/K |
| 20 ℃- 400℃ | 15 |
| Specific heat capacity |
| Temperature | 20℃ |
| J/gK | 0.41 |
| Melting point (℃) | 1280 |
| Max continuous operating temperature in air (℃) | 400 |
| Magnetic properties | non-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=0.03mm~8mm |
| OhmAlloy049R | Ribbon | W=0.4~40 | T=0.03~2.9mm |
| OhmAlloy049S | Strip | W=8~200mm | T=0.1~3.0 |
| OhmAlloy049F | Foil | W=6~120mm | T=0.003~0.1 |
| OhmAlloy049B | Bar | Dia=8~100mm | L=50~1000 |
The thermocouple alloy wires with different varieties and
specifications of our company can be applied in all kinds of
thermocouples, the temperature ranges from -270℃ to 1800℃. The
thermocouple alloy wires have excellent performance and are
extensively used in the temperature measurement and control in
different fields, such as metallurgy, chemical industry, petroleum
industry, machinery-electric industry, energy industry, agriculture
and military industry. Our products conform to the standards of
IEC584 -1and IEC-2 and ANSI96-1.
Characteristics:
● Excellent thermoelectricity, excellent linear relationship between
thermoelectrical potential and the temperature.
● Excellent thermoelectrical stability, high accuracy.
Main technical data:
Thermocouple variety, index and temperature measurement range.
