Nichrome Cr20Ni80

Wire subdivides by purpose:

• for heating elements;


• for tubular heaters;


• for resistors.

Fields of application:

Cr20Ni80 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, soldering irons, metal sheathed tubular elements, cartridge elements, etc.

Technical information.

Cold drawn wire is produced from the alloy grade Cr20Ni80 in soft heat- treated position diameter 0.1- 7.5 mm according to the standard GOST 12766.1-90.

Chemical composition of Cr20Ni80 alloy should be according to GOST 10994 – 74.

Grade	Standard	Chemical composition, %
		C	Si	Mn	Cr	Mo	Ni	S	P	Cu	Remark
Cr20Ni80	GOST 10994-74	≤ 0.100	0.90 - 1.50	≤ 0.70	20.00-23.00		bal.	≤ 0.020	≤ 0.030		Ti ≤ 0.30 Al ≤ 0.20 Fe ≤ 1.00

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 * 10-6
Thermal diffusivity, 10-5 m2/s. at 25 °C > 400 °C > 800 °C	0.31 0.44 0.56
Specific heat, J/kg*К At 25 °C > 800 °C	0.44 -
Elongation, % not less	20
Short term resistance of tensile strength, N/mm2 (кg F /mm2), not more	880(90)
Specific electric resistance, Оm•mm2/m at 20°С	1.07—1.18

Advantages:

• high temperature of exploitation and corrosion resistance in the air, vacuum, oxide, sulfur, nitric mediums, argon, ammonia, humid air;


• news - working temperature of “Ni Cr 80 20 +” is 1500 °C, guarantee 10000 hours.