6J40 Constantan Alloy Precision Electrical Alloys

6J40 Constantan alloy precision electrical alloys, with their extremely low temperature coefficient of resistance (TCR) and excellent processing properties, are a core material in the manufacture of precision electronic components, shunts, and thermocouple compensating wires. The thermoelectric potential of 6J40 against copper is 45 μV/°C, which is considered a challenge in precision resistance applications because temperature differences at the connection points can generate parasitic voltages. However, this characteristic makes 6J40 an ideal negative electrode material for manufacturing J-type thermocouples and compensating wires. 6J40 has a very wide operating temperature range (5°C to 500°C). Its oxidation resistance is superior to that of manganin, maintaining relatively stable electrical properties in air at temperatures up to 500°C.

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Grade		CONSTANTAN	MANGANIN	MANGANIN	MANGANIN
Grade		6J40	6J12	6J8	6J13
Main chemical composition (%)	Mn	1–2	11–13	8–10	11–13
	Ni	39–41	2–3	–	2–5
	Cu	Bal	Bal	Bal	Bal
Max Working Temperature (℃)		5–500	5–45	10–80	10–81
Density (g/cm³)		8.88	8.44	8.7	8.4
Resistivity (μΩ·m, 20℃)		0.48±3%	0.47±3%	0.35±5%	0.44±4%
Elongation (φ>1.0)		≥15	≥15	≥15	≥15
Resistance Temperature Coefficient (10⁻⁵/℃, 20–600℃)		– 40~+40	–3~+20	– 5~+10	0~+40
Thermo EMF (μV/℃, 0–100℃)		45	1	2	2

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.