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CuNi44 Flat Wire (ASTM C71500/DIN CuNi44) Nickel-Copper Alloy for Electrical Components

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CuNi44 Flat Wire (ASTM C71500/DIN CuNi44) Nickel-Copper Alloy for Electrical Components

Name: CuNi44 Flat Wire ASTM C71500DIN CuNi44 NickelCopper Alloy for Electrical Components
Brand: Huona
Price: 1 USD

Brand Name : Huona

Model Number : CuNi44

Certification : ISO9001

Place of Origin : Shanghai

MOQ : 10kg

Price : Negotiable

Payment Terms : L/C,T/T,Western Union,MoneyGram

Supply Ability : 500 tons per year

Delivery Time : 5-21 days

Packaging Details : Carton/Wooden Case

Product Name : CuNi44 flat wire

Thickness Range : 0.05mm – 0.5mm

Width Range : 0.2mm – 10mm

Tensile Strength : 450 – 550 MPa (annealed)

Elongation : ≥20% (annealed)

Hardness (HV) : 130 – 170 (annealed); 210 – 260 (half-hard)

Chemical Composition (Typical, %) : Ni:43-45%

Surface Finish : Bright annealed (Ra ≤0.2μm)

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Product Description

CuNi44 Flat Wire

Product Advantages and Grade Distinctions

CuNi44 flat wire stands out for its exceptional electrical resistance stability and mechanical workability, making it a superior choice for precision electrical components. Compared to similar copper-nickel alloys like CuNi10 (Constantan) and CuNi30, CuNi44 offers a higher resistivity (49 μΩ·cm vs. 45 μΩ·cm for CuNi30) and a lower temperature coefficient of resistance (TCR), ensuring minimal resistance drift in temperature-fluctuating environments. Unlike CuNi10, which excels in thermocouple applications, CuNi44’s balanced combination of formability and resistance stability makes it ideal for high-precision resistors, strain gauges, and current shunts. Its flat cross-section design further enhances heat dissipation and contact uniformity compared to round wires, reducing hot spots in high-current applications.

Standard Designations

Alloy Grade: CuNi44 (Copper-Nickel 44)

UNS Number: C71500

DIN Standard: DIN 17664

ASTM Standard: ASTM B122

Key Features

Superior Resistance Stability: TCR of ±40 ppm/°C (-50°C to 150°C), outperforming CuNi30 (±50 ppm/°C) in precision applications.

High Resistivity: 49 ± 2 μΩ·cm at 20°C, ensuring efficient current control in compact designs.

Flat Profile Benefits: Increased surface area for better heat dissipation; improved contact with substrates in resistor manufacturing.

Excellent Formability: Can be rolled to tight dimensional tolerances (thickness 0.05mm–0.5mm, width 0.2mm–10mm) with consistent mechanical properties.

Corrosion Resistance: Resists atmospheric corrosion and freshwater exposure, suitable for harsh industrial environments.

Technical Specifications

Attribute	Value
Thickness Range	0.05mm – 0.5mm
Width Range	0.2mm – 10mm
Thickness Tolerance	±0.001mm (≤0.1mm); ±0.002mm (>0.1mm)
Width Tolerance	±0.02mm
Aspect Ratio (Width:Thickness)	2:1 – 20:1 (custom ratios available)
Tensile Strength	450 – 550 MPa (annealed)
Elongation	≥20% (annealed)
Hardness (HV)	130 – 170 (annealed); 210 – 260 (half-hard)

Chemical Composition (Typical, %)

Element	Content (%)
Nickel (Ni)	43.0 – 45.0
Copper (Cu)	Balance (55.0 – 57.0)
Iron (Fe)	≤0.5
Manganese (Mn)	≤1.0
Silicon (Si)	≤0.1
Carbon (C)	≤0.05

Product Specifications

Item	Specification
Surface Finish	Bright annealed (Ra ≤0.2μm)
Supply Form	Continuous rolls (50m – 300m) or cut lengths
Packaging	Vacuum-sealed with anti-oxidation paper; plastic spools
Processing Options	Custom slitting, annealing, or insulation coating
Compliance	RoHS, REACH certified; material test reports available

Typical Applications

Precision wirewound resistors and current shunts

Strain gauge grids and load cells

Heating elements in medical devices

EMI shielding in high-frequency circuits

Electrical contacts in automotive sensors

We provide tailored solutions for specific dimensional requirements. Free samples (1m lengths) and comparative performance data with CuNi30/CuNi10 are available upon request.

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