NiCr 70 30

Common trade names NiCr 70/30, Resistohm 70, Nikrothal 70, Chromel 70/30, HAI-NiCr 70, Cronix 70, Inalloy 70, X30H70.

NiCr 70 30 (Werkstoff Nr 2.4658) is an austenitic Nickel-Chromium alloy for use at temperatures up to 1250°C. The 70/30 alloy is characterized by high resistivity and good oxidation resistance. It has good ductility after use and excellent weldability.

Chemical composition

Nickel Ni 67-70% Chromium Cr 29-32% Iron Fe 1.0% Silicon Si 1.0-2.5% Manganese Mn 1.0% Copper Cu 0.5% Carbon C 0.1% Cupper Cu 0.4% Aluminium Al 0.1%

Physical properties

Density at
Room°C		 Electrical
Resistivity
at 20°C		 Melting Point
°C		 Max Continuous
Operating Temperature
in Air °C		 Magnetic Properties
8.2 g/cm3 1.16(1.19)* microhm-m 1380 1200 The Material is Non-Magnetic
*Electrical Resistivity 1.16 Ω mm2/m corresponds to an Oxidized Annealed condition
Electrical Resistivity 1.19 Ω mm2/m corresponds to a Bright Annealed condition

Mechanical properties

NiCr 80 20
Wire, mm		 Yield Strength
Rp0.2 (MPa)		 Tensile Strength
Rm (MPa)		 Elongation
A %		 Hardness Hv
1.0 420 810 30 180
4.0 300 725 30 160

Product forms

Product     Size (mm) Condition of Supply
Wire 0.2 – 12.0 Bright Annealed
Oxidized
Bar 5.0 – 60.0 Hot Finished
Cold Finished
Peeled
Bright Turned
Bright Annealed
Strip Thickness 2.5 – 5.0
Width 20 – 100		 Cold Finished
Bright Annealed
Ribbon Thickness 0.2 – 1.0
Width 2.0 – 4.5 		Bright Annealed
Flat Rolled
Stranded Wire 2.5 – 3.0 Hard
Annealed

Application

NiCr 70-30 is used for corrosion resistant electric heating elements in industrial furnaces with reducing atmospheres. Nickel Chrome 70/30 is highly resistant to oxidation in air. Not recommend for use in MgO sheathed heating elements, or applications using nitrogen or carburizing atmospheres.

  • Electrical parts and electronic components.
  • Electric heating elements (home & industrial use).
  • Industrial furnaces up to 1250°C.
  • Heating cables, mats and cords.
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