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Fe-CuNi(Constantan) thermocouple wire (Type-J)
Fe-CuNi thermocouple (type J) is also named Fe- Constantan thermocouple. The positive legFe(JP) is made by pure iron, and the main chemical composition of the negative leg Constantan (JN) is Cu: Ni= 55%: 45%. Although they are all called Constantan, JN does not give the same EMF output curve as EN and TN; it cannot be instead by other Constantan.
The operating temperature range of type Jthermocouple is-210-1200℃, but it is usually used in the temperature range 0-750℃ due to embrittlement of Iron.
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| Type | Chemical composition (%) | ||||
| Ni | Cu | Mn | Si | Fe | |
| JP (Fe, Positive) | / | / | / | / | 100 |
| JN (CuNi, Negative) | 45 | 55 | / | / | / |
| Standard | IEC60584-1 | ||||
| Type | EMF Versus Pt.67(mV) | ||||
| 100℃ | 200℃ | 300℃ | 400℃ | 600℃ | |
| JP-JN | 5.207–5.331 | 10.717–10.841 | 16.244–16.410 | 21.760–21.936 | 32.956–33.236 |
| Physical property | |||||
| Type | Density at 20℃ (g/cm³) | Melting point (℃) | Tensile Strength (Mpa, Soft annealed condition in 20℃) | Elongation (%) (Soft annealed condition in 20℃) | Resistivity at 20℃ (μΩ·m) |
| JP | 7.8 | 1407 | ≥240 | ≥20 | 0.12 |
| JN | 8.9 | 1220 | ≥390 | ≥25 | 0.49 |
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.
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