Project Description
Nichrome 70
Nichrome 70 is a nickel-chromium alloy (NiCr alloy) for use at temperatures up to 1250℃.
Equivalent Grades
Trademarks | GB | JIS | ASTM | UNS | DIN | W-Nr. | ГОСТ | BS | NF | SS |
---|---|---|---|---|---|---|---|---|---|---|
Nikrothal 70 Nichrome 70 Chrome 70/30 Tophet 30 Resistohm 70 Stablohm 710 Gilphy 70 | Cr30Ni70 | – | Nichrome 70 | N06008 | NiCr70 30 | 2.4658 | ХН70Ю | – | – | – |
Specifications
GB/T 1234-1995 (CN); JIS C2520-199(JP); ASTM B344-01(USA); DIN 17470-1984(GER); GOST 10994 & GOST 12766/1-1990 (RU)
Product Forms
Wire, Bar, Strip, Sheet, Tube, Mesh, Conveyor belt, Radiant tube heater
Chemical Composition, %
Alloy | C | Si | Mn | P | S | Cr | Ni | Al | Fe |
---|---|---|---|---|---|---|---|---|---|
Nichrome 70 | ≤0.08 | 0.75~1.60 | ≤0.60 | ≤0.02 | ≤0.015 | 28.0~31.0 | Bal | ≤0.50 | ≤1.0 |
Mechanical Properties (RT, Annealed)
Tensile Strength, Rm/MPa | Elongation, A/% | |
---|---|---|
Dia. >3.00mm (for wire) | Dia. 0.10~3.00mm (for wire) and Th. >0.20 (for strip) | |
≥650 | ≥25 | ≥20 |
Physical Properties
Max Working Temperature, ℃ | Melting Point, ℃ | Density, g/cm3 | Resistivity, μΩ·m, 20℃ | Specific Heat, J/g·℃ | Thermal Conductivity, KJ/m·h·℃ | Average Coefficient of Linear Expansion, α×10-6/℃ (20~1000℃) | Micrographic Structure | Magnetic Properties |
---|---|---|---|---|---|---|---|---|
1250 | 1380 | 8.1 | 1.18 | 0.461 | 45.2 | 17.0 | Austenitie | Non-Magnetic |
Life Test
Test Temperature, ℃ | Continuous Service Time Hours, ℃ |
---|---|
1250 | ≥50 |
Temperature Factor of Resistivity
20℃ | 100℃ | 200℃ | 300℃ | 400℃ | 500℃ | 600℃ | 700℃ | 800℃ | 900℃ | 1000℃ | 1100℃ | 1200℃ | 1300℃ |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1.000 | 1.007 | 1.016 | 1.028 | 1.038 | 1.044 | 1.036 | 1.030 | 1.028 | 1.029 | 1.033 | 1.037 | 1.043 | – |
Features
- Great ductility
- Excellent workability and weldability under high temperature
- High and stable resistivity
- Surface oxidation resistance
- Sufficient high temperature strength
- Working temperature up 1250℃
Applications
- Corrosion resistant electric heating elements in industrial furnaces with reducing atmospheres
- Highly resistant to oxidation in air
- Not recommend for use in MgO sheathed heating elements, or applications using nitrogen or carburizing atmospheres