Copper
Cu
Bal.
Manganese
Mn
11~13%
Nickel
Ni
2~3%
Normal Manganina 47 is a copper-manganese-nickel alloy ( ) for use at room temperature. The alloy is characterized by very low thermal electromotive force (emf) compared to copper.(Common Name:Normal Manganin,Normal Manganin 47,CuMn12Ni2，6J12 )
Normal Manganina 47 is typically used for the manufacturing of resistance standards, precision wire wound resistors, potentiometers, shunts and other electrical and electronic components.
Normal Manganin 47 widely used for precision resistors with the highest requirements, the resistors should be carefully stabilised and the application temperature should not exceed +60 °C. Exceeding the maximum working temperature in air may result in a resistance drift generated by oxidizing. Thus, the long-term stability can be affected negatively. As a result, the resistivity as well as the temperature coefficient of the electric resistance may slightly change.
It is also used as low cost replacement material for silver solder for hard metal mounting.The alloy's low emf vs. copper makes it ideal for use in electrical circuits, especially D.C., where a spurious thermal emf could cause malfunctioning of electronic equipment. Due to the low operating temperature, the temperature coefficient of resistance is controlled to be low over a range of 15 to 35°C .
Typical Mechanical properties（1.0mm）
| Yield strength |
Tensile Strength |
Elongation |
| Mpa |
Mpa |
% |
| 180 |
390 |
15 |
Typical Physical properties
| Density (g/cm3) |
8.44 |
| Electrical resistivity at 20℃ (Ωmm2/m) |
0.47 |
| Temperature factor of resistivity（20℃~600℃）X10-5/℃ |
-3~20 |
| Conductivity coefficient at 20℃ (WmK) |
40 |
| EMF vs Cu(μV/℃ )(0~100℃ ) |
1 |
| Melting point (℃) |
960 |
| Element working temperature in air (℃) |
5~45 |
| Magnetic properties |
Non |
| Coefficient of thermal expansion |
| Temperature |
Thermal Expansion x10-6/K |
| 20 ℃- 400℃ |
18 |
| Specific heat capacity |
| Temperature |
20℃ |
| J/gK |
0.41 |
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 |
| Manganin 47 |
good |
good |
good |
good |
bad |
good |
Style of supply
| Alloys Name |
Type |
Dimension |
| Manganin 47W |
Wire |
D=0.03mm~8mm |
| Manganin 47R |
Ribbon |
W=0.4~40 |
T=0.03~2.9mm |
| Manganin 47S |
Strip |
W=8~200mm |
T=0.1~3.0 |
| Manganin 47F |
Foil |
W=6~120mm |
T=0.003~0.1 |
| Manganin 47B |
Bar |
Dia=8~100mm |
L=50~1000 |
