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Cr20Ni80

Wire subdivides by purpose:

  • for heating elements;
  • for tubular heaters
  • for resistors

Fields of application:

Cr20N80 is a high grade austenitic alloy. Due to its malleability and strength at high temperatures. Cr20Ni80 is especially suited for ap­plications in the electrical appliance industry. In industrial furnace use Cr20Ni80 has many advantages due to its excellent mechanical properties in the hot state.

Cr20Ni80 has superior life compared to competitive NiCr alloys because of the extremely good adhesion properties of the surface ox­ide. Typical applications for Cr20Ni80 are flat irons. Ironing machines, water heaters, plastic mould dies, soidering irons, metal shea­thed tubular elements, cartridge elements, etc. Technical information

Cokl drawn wire is produced from the alloy grade Cr20Ni80 in soft heat- treated position diameter 0.1- 7.5 mm according to the standard GET/1234-95. Chemical composition of Cr20Ni80 alloy should be according to GBT/1234-95.

Grade

Standard

Chemical composition. %

C

Si

Mn

Cr

Ni

S

P

Cu

Remark

Cr20Ni80

GBT/1234-95

≤0.100

0.90-1.50

≤0.70

20.00-23.00

bal

≤0.020

≤0.030

/

Ti ≤ 0.30

Al ≤ 0.20

Fe ≤ 1.50

 

Physical and mechanical properties of Cr20NI80 alloy are indicated in the table.

Physical and mechanical properties:

 

Density, gram/cm3

8.4

Melting point, °C

1400

Structure

austenitic

Magnetization

non- magnetic

Hardness. HB

140-150

Temperature coefficient of linear growth. K-1 in the range 20 - 1000°C

18 * 104

Thermal diffusivity. 10-5 m2/s.

 

At 25°C

0.31

>400°C

0.44

>800°C

0.56

Specific heat, J/kg*K

 

At 25°C

0.44

>800°C

 

Elongation, % not less

20

Short term resistance of tensile strength, N'mm! (kg F /mm2), not more

880(90)

Specific electric resistance. μΩ/m at 20°C

1.05-1.14

Advantages:

  • High temperature of exploitation and corrosion resistance in the air. vacuum, oxide, sulfur, nitric mediums, argon, ammonia, humid air.
  • News: working temperature of "Nl Cr 80 20 +' is 1500°C. guarantee 10000 hours.