cr30ni70 cr20ni80 nichrome resistance alloy heating wire

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title :

cr30ni70 cr20ni80 nichrome resistance alloy heating wire

Type :

wire

Material :
stainless steel, carbon steel, galvanized, aluminum, copper, alloy steel

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High quality cr30ni70 cr20ni80 nichrome resistance alloy heating wire

Product Description

  

heat resistance wire is a type of high resistance electrical wire. The wire resists the flow of electricity, and converts the electrical energy into heat.

 

Nichrome, a non-magnetic alloy of nickel and chromium, is commonly used to make resistance wire because it has a high resistivity and resistance to oxidation at high temperatures. When used as a heating element, resistance wire is usually wound into coils.

The high nickel content, in combination with the high chromium content let the scaling temperature can reach to 1250ºC

Chrome Nickel wire was shaped by means of high speed automatic cooling machine of which the power capacity is controlled by computer, they are available as wire and ribbon(strip).

 

nichrome alloy wire Product forms and size range 

Nichrome Alloy Grade

Cr20Ni80,Cr20Ni30,Cr15Ni60,Cr20Ni35,Cr20Ni40

Form

Round wire,Flat wire,Strip,Bar,Spring shaped wire, Wave shaped strip,Radiant tube heater

Size

Wire: 0.030mm-10mm

Ribbon: 0.05*0.2mm-2.0*6.0mm
Strip: 0.5*5.0mm-5.0*250mm

furnance spring wire according to customers requirement 

 

 

nichrome alloy wire Features and advantages

1)The highest working temperature up to 1200 degree.

2)higher strength than iron chromium aluminum under high temperature

3)not easy to deform under high temperature

4)good plasticity

5)easy to repair,

6)high emissivity,

7)Non-magnetic

8)strong corrosion resistance,

9)long service life

 

nichrome alloy wire Application

Chrome nickel wire resistance is widely used for making electric heating elements in home appliances and industrial furnaces.,various electrical resistors and locomotive braking resistor, infrared equipment, liquefied gas infrared heat-resisting net, different kinds of igniting and radiating electrodes and voltage-regulating resistors for motors and so on in Metallurgical machinery

 

nichrome alloy wire Main characteristics

Type

Cr20Ni80

Cr15Ni60

Cr30Ni70

Cr20Ni35

Cr20Ni30

 

Main chemical composition

Ni

Rest

55.0~61.0

Rest

34.0~37.0

30.0~34.0

Cr

20.0~23.0

15.0~18.0

28.0~31.0

18.0~21.0

18.0~21.0

Fe

≤1

Rest

≤1

Rest

Rest

Maximal Temperature(℃)

1200

1150

1250

1100

1100

Resistance Temperature correction coefficient.(CT)

1.09±0.05

1.11±0.05

1.18±0.05

1.04±0.05

1.06±0.05

Melting point (℃)

1400

1390

1380

1390

1390

Resistivityρ20℃(10-6Ω.m)

800℃

1.008

1.078

1.028

1.188

1.173

1000℃

1.014

1.095

1.033

1.219

1.201

1200℃

1.025

 

1.043

 

 

Fast life value

Tem.(℃)

1175

1100

1200

1050

1050

hour(h)

≥110

≥100

≥110

≥100

≥100

Specific gravity(g/cm3)

8.40

8.2

8.1

7.90

7.90

Elongation(%)

≥25

≥25

≥20

≥20

≥20

Thermal(kj/m.h.℃)

60.3

45.2

45.2

43.8

43.8

Specific heat(20℃)j/g.℃

0.440

0.494

0.461

0.500

0.500

Extend strength(20~1000℃)α*10-6℃

18.0

17.0

17.1

19.0

19.0

Tensile strength(kg/mm2)

>85

>85

>85

>85

>85

Repeatedly bending(F/R)

>12

>12

>12

>12

>12

Microstructure

Austenitic

Austenitic

Austenitic

Austenitic

Austenitic

  

 

nichrome alloy wire Notice

Resistance electric heating wire has strong antioxidant properties, but a variety of gases in furnaces such as air, carbon, sulfur, hydrogen and nitrogen atmosphere, still have a certain impact on it.

 

Although these heating wires all have had antioxidant treatment, the transportation, winding, installation and other process will cause damage to a certain extent and reduce its service life.

 

In order to extend the service life, customers need to do pre oxidation treatment before using. The method is to heat alloy elements which have installed completely in the dry air to the temperature (lower 100-200C than its maximum using temperature), heat preservation for 5 to 10 hours, then cooling slowly with furnace.

 

Pictures of nichrome alloy wire

 

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