NiCr 70 30

UNS N06008
Werkstoff – Nr. 2.4658
DIN 17470 / 17471
Common trade names NiCr 70/30, Resistohm 70, Nikrothal 70, Chromel 70/30, HAI-NiCr 70, Cronix 70, Inalloy 70, X30H70.

NiCr 70 30 (2.4658) is an austenitic nickel-chromium alloy (NiCr 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 60.0% Chromium Cr 29.0-32.0% Iron Fe 5.0% Silicon Si 0.5-2.0% Manganese Mn 1.0% Copper Cu 0.5% Carbon C 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

  stranded wire

2.5 – 3.0

            hard
            annealed


Application

NiCr 70-30 (2.4658) 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.

Our customers can buy nichrome wire online according to their requests.

 NiCr 7030 datasheet. Download(286KB)