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Home ProductsCopper Based Alloys

Precision Resistance Constantan Wire For Relay , Copper Nickel Wire

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China Ohmalloy Material Co.,Ltd certification
China Ohmalloy Material Co.,Ltd certification
I search for Nichrome plate long time, and successfully bought it from Ohmalloy material. OHMALLOY provide real good service in alloy service and can always help me in finding the correct resistance alloy.

—— Mike Harness

OHMALLOY can provie me only 1kg Kovar alloy wire 1.0mm with short time, that is really amazing. Thanks

—— Janey

Really professional in thermocouple wire and cable, what i want just can get from OHMALLOY

—— Chris

Enamelled Constantan 0.08mm, i never expect to get only 2kg of it. But OHMALLOY supply it to me with good quality. God Jesus! Such a reliable supplier from china

—— Aaron

Precision Resistance Constantan Wire For Relay , Copper Nickel Wire

Precision Resistance Constantan Wire For Relay , Copper Nickel Wire
Precision Resistance Constantan Wire For Relay , Copper Nickel Wire

Large Image :  Precision Resistance Constantan Wire For Relay , Copper Nickel Wire Get Best Price

Product Details:
Place of Origin: China(Shanghai)
Brand Name: OHMALLOY
Certification: SGS,CE,ISO
Model Number: CN40W0173B
Payment & Shipping Terms:
Minimum Order Quantity: 5
Price: negotiable
Packaging Details: Plastic packing inside, wooden box outside , choose the suitable packing, Alos it can be customized by the clients' demand.
Payment Terms: , T/T, L/C
Supply Ability: 80000Kg/Week
Detailed Product Description
Common Name: CuNi44 Shape: Wire
Working Temperature: 400℃ Application: Resistance
Tensile Strength: 420Mpa Electrical Resistivity At 20℃ (Ωmm2/m): 0.49
High Light:

copper alloys


copper nickel alloy

Precision Resistance Constantan Wire For Relay , Copper Nickel Wire
    OhmAlloy49(Resistance heating wire and resistance wire)
(Common Name:CuNi44,NC50.Cuprothal, Alloy 294, Cuprothal 294, Nico, MWS-294, Cupron, Copel, Alloy 45, Neutrology, Advance, CuNi 102, Cu-Ni 44, Konstantan,constantan.)
    OhmAlloy49 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.
OhmAlloy49 is manufactured from electrolytic copper and pure nickel. In finer wire sizes the alloy is designated as OhmAlloy49TC(Thermocouple).

Normal composition%


Applicationg Photo:
Precision Resistance Constantan Wire For Relay , Copper Nickel Wire 0
Typical Mechanical properties(1.0mm)

Yield strengthTensile StrengthElongation

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

TemperatureThermal Expansion x10-6/K
20 ℃- 400℃15


Melting point (℃)1280
Max continuous operating temperature in air (℃)400
Magnetic propertiesnon-magnetic

Corrosion resistance performance

AlloysWorking In atmosphere at 20℃Working at max temperature 200℃

Air and oxygen contain

gases with Nitrogen

gases with sulfur

gases with sulfur


Style of supply

Alloys NameTypeDimension

1. What's the minimum quantity customer can order?
If we have your size in stock, we can provide any quantity you want.
If we do not have, for spool wire, we can produce 1 spool, about 2-3kg. For coil wire, 25kg.

2. How can you pay for small sample amount?
We have account, wire transfer for sample amount also ok.
3. Customer do not have express account. How will us arrange the delivery for sample order?
Just need to provide your address information, we will check the express cost, you can arrange the express cost together with sample value.
4. What's our payment terms?
We can accept LC T/T payment terms, it also depending on delivery and total amount. Let's talk more in details after getting your detailed requirements.
5. Do you provide free samples?
If you want several meters and we have stock of your size, we can provide, customer need to bear the International express cost.

Contact Details
Ohmalloy Material Co.,Ltd

Contact Person: Claudia

Tel: +8617301606058

Send your inquiry directly to us