CUNI2 Copper-Nickel Weldable Resistance Alloy

CUNI2 copper-nickel weldable resistance alloy represents a critical turning point in the transition from pure copper to high-resistance alloys. By introducing approximately 2% nickel atoms into the copper matrix, it achieves a precise jump in resistivity through lattice distortion effects while maintaining excellent metallic continuity. In metal physics, resistance originates from the scattering of electron flow as it passes through the crystal lattice. CuNi2, by precisely controlling the 2% nickel content, artificially creates uniformly distributed scattering centers while maintaining efficient electron transport. The temperature coefficient of resistance of CuNi2 is at a moderate level. This means that its resistance value increases slightly with increasing temperature. This characteristic is extremely valuable in certain "self-compensating" circuits, where the slight increase in resistance can provide a degree of current-limiting protection when the circuit overheats.

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Specification
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Grade		CuNi1	CuNi2	CuNi6	CuNi8	CuMn3	CuNi10	CuNi14	CuNi19	CuNi23	CuNi30	CuNi34	CuNi44
Grade		NC003	NC005	NC010	NC012	MC012	NC015	NC020	NC025	NC030	NC035	NC040	NC050
Composition (%)	Cu	Bal	Bal	Bal	Bal	Bal	Bal	Bal	Bal	Bal	Bal	Bal	Bal
	Mn	—	—	—	—	3	—	0.3	0	0.5	1	1	1
	Ni	1	2	6	8		10	14.2	19	23	30	34	44
Max operating temperature (℃)		200	200	220	250	200	250	300	300	300	350	350	400
Resistivity (μΩ·m @20℃)		0.03±10%	0.06±10%	0.1±10%	0.12±10%	0.12±10%	0.15±10%	0.2±5%	0.25±5%	0.35±5%	0.35±5%	0.4±5%	0.49±5%
Temperature coefficient of resistance (×10⁻⁶/℃)		<100	<120	<60	≈57	<38	<50	<38	<25	<16	<10	0	< -8
Thermoelectric voltage vs Copper (μV/K @20℃)		-8	-12	-18	-22	1	-25	-28	-32	-34	-37	-39	-43
Mean thermal expansion coefficient (×10⁻⁶/℃)		17.5	17.5	17.5	17.5	18	17.5	17.5	17.5	17.5	17	16	15
Thermal conductivity (W/mK)		145	130	92	75	84	59	48	38	33	27	25	23
Specific heat capacity at 20℃ (J/gK)		0.38	0.38	0.38	0.38	0.39	0.38	0.38	0.38	0.38	0.39	0.4	0.41
Density (g/cm³)		8.9	8.9	8.9	8.9	8.8	8.9	8.9	8.9	8.9	8.9	8.9	8.9
Melting temperature (℃)		1085	1090	1095	1097	1050	1100	1115	1135	1150	1170	1180	1280
Min tensile strength (N/mm²)		210	220	250	270	290	290	310	340	350	400	400	420
Elongation (%)		25	25	25	25	25	25	25	25	25	25	25	25

Danyang Haiven Electric Heating Alloy Co., Ltd. is located in Lucheng Town, Danyang City, Jiangsu Province, China. The company was established in 2010 based on the original company "Danyang Huakang Electric Heating Alloy Co., Ltd." and has been in operation for over 40 years. Since its expansion, the company's total area has reached 30,000 square meters. The company has production lines for a series of products including FeCrAl, Kanthal, CuNi, NiCr, CuMn, Kangtong, Monel, Incoloy, Hastelloy, etc. We have equipped with advanced equipment and processes, capable of providing a complete product range from raw material melting, steel rolling, stretching, heat treatment to finished products and packaging. Standardization work and strict inspections run through every stage of the product. As Haiven people, we have always adhered to the goal of "building a first-class brand and a first-class enterprise". We uphold the spirit of "quality first, reputation foremost", providing customers with the highest quality products and competitive prices. Welcome new and old customers at home and abroad to visit and patronize. Let us achieve long-term win-win cooperation.