Data Sheet: Nickel-Chromium Alloys


Learn more about each nickel speciality alloy

  • Nickel Chromium Heating Element and Resistance Alloy Grades

Nickel-Chromium Alloys: Heating Element & Resistance

These alloys are especially characterized by high resistivity and high resistance to oxidation and chemical corrosion. They are suitable for making high-value electrical resistors, heating wires, heating cords and cables.

NiCr 80:20 is suitable for heating elements used for temperatures upto 1200°C. This is used for electrical cooking equipment, precison resistors. Oxidized wires of these alloys display better insulation properties.

NiCr 70:30 is suitable for heating elements used for temperatures upto 1230°C for industrial furnaces which have alternating oxidizing, or reducing atmosphere. This alloy has excellent corrosion resistance and long life in air and controlled atmospheres.

NiCr 60:15 is suitable for heating elements used for temperatures upto 1150°C. This is used for electrically heated equipment, high resistance and potientiometer resistors.

NiCr 40:20 is suitable for heating elements used for temperatures upto 1050°C. This is used for domestic heating appliances, furnaces in carburizing, or semi-reducing atmospheres.

NiCr 30:20 / NiCr 20:25 are suitable for heating elements used for temperatures upto 1050°C. Inspite of relatively high Fe content, these alloys are resistant to oxidation and chemical corrosion. They are used for making heating elements of cooking equipment, heating cords and cables.

Specifications

Alloy ASTM Werkstoff Nr UNS designation DIN
NiCr 80:20 B344 2.4869 N06003 17470 / 17471
NiCr 70:30 - 2.4658 N06003 17470
NiCr 60:15 - 2.4867 N06004 17470 / 17471
NiCr 40:20 - - - -
NiCr 30:20 B344 1.4860 - 17470
NiCr 20:25 - 1.4843 - 17470

Nominal Chemical Composition (%)

Alloy Ni Mn Fe Si Cr C Al Cu
NiCr 80:20 Balance Max 1.0 Max 1.0 1.0-1.5 19-21 Max 0.10 Max 0.30 Max 0.50
NiCr 70:30 Balance Max 1.0 Max 1.0 1.0-3.0 28-32 Max 0.10 Max 0.20 Max 0.50
NiCr 60:15 Min 57.0 Max 1.0 Max 1.0 1.0-1.5 14-17 Max 0.10 Max 0.30 Max 0.50
NiCr 40:20 Min 37.0 Max 1.0 Balance 1.8-3.0 18-22 Max 0.10 Max 0.30 Max 0.50
NiCr 30:20 Min 28.0 Max 1.0 Balance 1.8-3.0 18-22 Max 0.10 Max 0.30 Max 0.50
NiCr 20:25 Min 18.0 Max 1.0 Balance 1.0-1.5 23-27 Max 0.10 Max 0.30 Max 0.50

Physical & Mechanical Properties (at room temperature)

Alloy Density Tensile Strength Elongation Specific Heat
at 20°C
Coeff. of
Linear Expansion
b/w 20-1000 °C
Max. Operating
Temp of
Heating Element
g/cm³ N/mm² % at L0=100 mm J/kg°C 10-6/K °C
NiCr 80:20 8.41 700-900 25-35 435 17 1200
NiCr 70:30 8.16 800-950 25-30 460 17 1250
NiCr 60:15 8.25 700-850 25-35 450 17 1150
NiCr 40:20 7.95 700-850 25-35 460 19 1050
NiCr 30:20 7.90 650-800 25-35 500 19 1050
NiCr 20:25 7.80 600-800 25-35 500 14 1050

Electrical Properties

Alloy Specific Resistance
(Electrical Resistivity) at 20°C
Temp Coeff of Resistance
x 10-6/°C
µΩ-cm Value Temp Range
NiCr 80:20 108 60 20-1000°C
NiCr 70:30 118 110 20-1000°C
NiCr 60:15 112 170 20-1000°C
NiCr 40:20 105 60 20-1000°C
NiCr 30:20 104 60 20-1000°C
NiCr 20:25 95 60 20-1000°C

For resistance in Ω/m of any size, divide the above resistivity with cross-sectional area in mm² of the size x 100:

Resistance (Ω/m) = Resistivity (µΩ-cm) / Cross-sectional Area (mm²) x 100

Size Range

Form Dia Width Thickness
mm mm mm
Wire 0.10 - 12.0 - -
Strip - 10 - 100 0.2 - 4.5
Ribbon - 2.0 - 4.5 0.2 - 1.0

Other Grades of Nickel-Chromium resistance alloys are also available. Please contact us for more information.

Click here to download this data sheet in PDF format.

Related Links

Products

Nickel Alloys

Standard Nickel Grades:

Nickel-Manganese Alloys:

Nickel-Copper Alloys:

Welding Alloys Heating & Resistance

Nickel-Chromium Alloys:

Iron-Chrome-Aluminum Alloys

Nickel Chrome Iron Alloys Low Resistance & Shunt Alloys

Cu-Ni Low Resistance Alloys:

Cu-Mn-Ni Alloys:

Lamp Components & Alloys Thermocouple Alloys

Thermocouple Grade Alloys:

Extension and Compensating Grade Alloys:

Automotive Alloys

Alloys for Earth and Central Electrodes:

  • NiSi
  • NiCr15Fe
  • NiCr5SiMn
  • NiCr2SiMn
  • NiSi1Al1Y
Soft Magnetic Alloys

Temperature Compensating Alloys:

  • Ni30Fe
  • Ni31Fe
  • Ni32Fe

High Permeability Alloys:

  • SMA 48 (Ni48Fe)
  • SMA 50 (Ni50Fe)
  • SMA 80 (Ni80Mo5Fe)
Controlled Expansion Alloys
Dumet Wires
Clad Wires
  • Copper-Clad FeNi42
  • Copper-Clad FeNi60
  • Iron-Clad Nickel
  • Nickel-Clad Iron