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.

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)