Production according to Standards

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Invar alloy-FeNi36

Iron Fe Bal.
Nickel Ni 35.0~37.0%
Manganese Mn 0.2~0.6%
Silicon Si ≤0.3%
Carbon C ≤0.05%
Sulphur S ≤0.02%
Phosphorus P ≤0.02%





Invar
 alloy is also called INVAR alloy,it is an alloy consisting of nickel (Ni, 36%) and iron (Fe, the rest), has a uniquely low coefficient of thermal expansion. The Curie point of the alloy is about 230℃. Below this temperature, the alloy is ferromagnetic and has a very low expansion coefficient. Above this temperature, the alloy is non-magnetic, The expansion coefficient increases. The alloy is mainly used to manufacture components with approximately constant size within the range of temperature changes, and is widely used in the radio industry, precision instruments, meters and other industries.

Available shapes:
Invar wire, bar, bar, strip, forming, sheet, sheet, tube and other standard shapes are available.

Invar alloy Physical properties

Density Resistivity
at 20℃ 
Thermal conductivity Elastic modulus Curie point
(g/cm3)  (Ωmm2/m) λ/ W/(m*℃)  E/ Gpa Tc/ ℃
8.1 0.78 11 144 230
 

Invar alloy Coefficient of expansion
 
θ/℃ α1/10-6-1 θ/℃ α1/10-6-1
20~-60 1.8 20~250 3.6
20~-40 1.8 20~300 5.2
20~-20 1.6 20~350 6.5
20~-0 1.6 20~400 7.8
20~50 1.1 20~450 8.9
20~100 1.4 20~500 9.7
20~150 1.9 20~550 10.4
20~200 2.5 20~600 11.0

Invar alloy Mechanical performance

Tensile strength Elongation
Mpa %
641 14
689 9
731 8
 
Invar alloy Temperature Coefficient of Resistance
 
Temperature range
20~50 20~100 20~200 20~300 20~400
aR/ 103 *℃ 1.8 1.7 1.4 1.2 1.0
 
Product heat treatment process
Stress relief annealing Heat to 530~550℃, keep warm for 1~2 h. Cool in the furnace.
Annealing The workpiece is heated to 830~880℃, and kept for 30 minutes. Furnace cooling.
Stabilization
  1. Heat to 830 ℃ in protective atmosphere, keep for 20min. ~ 1h, quench.
  2. Temper
Precautions
  1. The alloy cannot be hardened by heat treatment.
  2. Surface treatment can be sandblasted, polished and pickled.

 
Invar alloy Supply form and specification
 
Alloy grade Form Size
Invar  Wire D= 0.1~8mm
Invar  Strip W= 5~250mm T= 0.1mm
Invar  Foil W= 10~100mm T= 0.01~0.1mm
Invar  Bar Dia= 8~100mm L= 50~1000mm
 
 

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