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CR20NI80 High-Purity NiCr, NiCrFe Alloys
The core secret behind the ability of CR20NI80 high-purity NiCr and NiCrFe alloys to operate reliably at high temperatures for extended periods lies in the dense chromium oxide protective layer formed on their surface. The presence of nickel enhances the adhesion of the oxide film to the substrate, preventing the oxide film from peeling off during drastic temperature fluctuations. This oxide film is extremely thin but incredibly dense, effectively preventing external oxygen atoms from diffusing into the deeper layers of the substrate. When the surface is damaged, chromium in the substrate quickly migrates to the surface and reforms the protective layer. Although its linear expansion coefficient of 18 × 10⁻⁶/℃ is slightly higher than that of steel, its thermal expansion process exhibits highly linear characteristics. This means that precise physical modeling can be performed when designing the heating element support structures of large industrial electric furnaces, avoiding element distortion or short circuits caused by thermal stress.
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| Property | Type | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 |
| Main chemical (%) | Ni | Bal | REST | 55.0–61.0 | 34.0–37.0 | 30.0–34.0 |
| Cr | 20.0–23.0 | 28.0–31.0 | 15.0–18.0 | 18.0–21.0 | 18.0–21.0 | |
| Fe | ≤1.0 | ≤1.0 | Bal | Bal | REST | |
| Max continuous service temp. (℃) | 1200 | 1100 | 1000 | 1000 | 1000 | |
| Melting point (℃) | 1400 | 1380 | 1390 | 1390 | 1390 | |
| Density (g/cm³) | 8.4 | 8.1 | 8.2 | 7.9 | 7.9 | |
| Resistivity (μΩ·m 20℃) | 1.09±0.05 | 1.18±0.05 | 1.11±0.05 | 1.04±0.05 | 1.04±0.05 | |
| Elongation (%) | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 | |
| Specific heat (J/g℃ at 20℃) | 0.44 | 0.461 | 0.494 | 0.5 | 0.5 | |
| Thermal conductivity (k J/m.h℃) | 60.3 | 45.2 | 45.2 | 43.8 | 43.8 | |
| Line expansion coefficient (α×10⁻⁶/℃(20–1000℃)) | 18 | 17 | 17 | 19 | 19 | |
| Micro structure | Austenite | Austenite | Austenite | Austenite | Austenite | |
| Magnetic properties | Non-magnetic | Non-magnetic | Non-magnetic | Weak magnetic | Weak magnetic | |
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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