Project Description

Nichrome 70

Nichrome 70 is a nickel-chromium alloy (NiCr alloy) for use at temperatures up to 1250℃.

Equivalent Grades

TrademarksGBJISASTMUNSDINW-Nr.ГОСТBSNFSS
Nikrothal 70
Nichrome 70
Chrome 70/30
Tophet 30
Resistohm 70
Stablohm 710
Gilphy 70
Cr30Ni70Nichrome 70N06008NiCr70 302.4658ХН70Ю

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, %

AlloyCSiMnPSCrNiAlFe
Nichrome 70≤0.080.75~1.60≤0.60≤0.02≤0.01528.0~31.0Bal≤0.50≤1.0

Mechanical Properties (RT, Annealed)

Tensile Strength, Rm/MPaElongation, 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/cm3Resistivity, μΩ·m, 20℃Specific Heat, J/g·℃Thermal Conductivity, KJ/m·h·℃Average Coefficient of Linear Expansion, α×10-6/℃ (20~1000℃)Micrographic StructureMagnetic Properties
125013808.11.180.46145.217.0AustenitieNon-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℃
1.0001.0071.0161.0281.0381.0441.0361.0301.0281.0291.0331.0371.043

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