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Copper Mn Alloy 6J12

Copper Mn Alloy 6J12

OHMALLOYNormal Manganin 47(Precision Resistance Alloy)(Common Name:Normal Manganin,Normal Manganin 47,CuMn12Ni2,6J12 )Normal Manganina 47 is a copper-manganese-nickel alloy (CuMnNi alloy) for use at r

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OHMALLOY

Normal Manganin 47(Precision Resistance Alloy)
(Common Name:Normal Manganin,Normal Manganin 47,CuMn12Ni2,6J12 )

Normal Manganina 47 is a copper-manganese-nickel alloy (CuMnNi alloy) for use at room temperature. The alloy is characterized by very low thermal electromotive force (emf) compared to copper.

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 .

Normal composition%

Nickel

2~3

Manganese

11~13

Copper

Bal.




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



Coefficient of thermal expansion

Temperature

Thermal Expansion x10-6/K

20 ℃- 400℃

18


Specific heat capacity

Temperature

20℃

J/gK

0.41


Melting point (℃)

960

Element working temperature in air (℃)

5~45

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

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

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