Electrical resistance alloys

VZPS - Electrical Resistance Alloys

Electrical resistance alloys are widely applied in electrical heaters, particularly NiCr. Nichrome is nickel and chromium alloy which is commonly used in production of resistance wire because of its high resistivity and stable anti-oxidation properties at temperatures up to 1250°C that’s why resistance wires are well-suited for service in extreme environments where they are subjected to pressure and heat. Vladimir Plant of Precision Alloys has been manufacturing resistance alloys and heating alloys from its foundation. Our strength is making wires, strips, ribbon and foil, including NiCr alloys and Fe-Cr-Al alloys.

Produced materials

  • NiCr 80 20 (UNS N06003 / 2.4869) – industrial furnaces (upto 1200°C), electric cooking equipment, precision resistors.
  • NiCr 70 30 (UNS N06008 / 2.4658) – industrial furnaces (upto 1250°C) with alternating oxidizing/reducing atmosphere, precision resistors.
  • NiCr 60 15 (UNS N06004 / 2.4767) – industrial furnaces (upto 1150°C), electrically heated equipment, high-resistance and potentiometer resistors.
  • NiCr 30 20 (1.4860) – industrial furnaces (upto 1050°C), electrically heated equipment, high-resistance and potentiometer resistors.

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


Chemical composition

Alloy

C, max

Mn, max

Si, max

Cr, max

Cu, max

Fe, max

Ni, min

NiCr 80 20

0.15

1.0

0.5-2.0

19.0-21.0

0.50

1.0

75.0

NiCr 70 30

0.10

1.00

0.5-2.0

29.0-32.0

0.5

5.0

60.0

NiCr 60 15

0.15

2.0

0.5-2.0

14.0-19.0

0.5

19.0-25.0

59.0

NiCr 30 20

0.1

1

1.8-3.0

18.0-22.0

0.5

balance

28

Physical properties

Alloy

Specific Resistant (Electrical Resistivity), (µΩ-mm)

Density (g/cm3)

Linear Expansion Coeff. Bet RT & 1000C (10-6/K)

Maximum Operating Temperature of Element (°C)(in air)

NiCr 80 20

1.09 8.4 17 1200

NiCr 70 30

1.18 8.2 17 1250

NiCr 60 15

1.12 8.2 17 1100

NiCr 30 20

1.04 7.9 17 1050

Mechanical properties

Alloy

Tensile Strength
Min - Max (MPa)

Elongation, %
(L0=100mm)

NiCr 80 20

700-900

25-35

NiCr 70 30

750-950

25-35

NiCr 60 15

700-850

25-35

NiCr 30 20

650-800

25-35


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