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4j36 Invar Alloy Wire Low Expansion Alloy Feni36 Wire

Short Description:

DIN 17745 4j36 Invar Alloy Wire Low Expansion Alloy Feni36 Wire

(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)

4J36 (Invar), also known generically as FeNi36 (64FeNi in the US), is a nickel-iron alloy notable for its uniquely low coefficient of thermal expansion (CTE or α).


  • Model NO.: Invar
  • OEM: Yes
  • State: Soft 1/2hard hard T-hard
  • HS Code: 74099000
  • Origin: China
  • Density: 8.1
  • Product Detail

    FAQ

    Product Tags

    4J36 (Invar) is used where high dimensional stability is required, such as precision instruments, clocks, seismic creep gauges, television shadow-mask frames, valves in motors, and antimagnetic watches. In land surveying, when first-order (high-precision) elevation leveling is to be performed, the Level staff (leveling rod) used is made of Invar, instead of wood, fiberglass, or other metals. Invar struts were used in some pistons to limit their thermal expansion inside their cylinders.

    4J36 use oxyacetylene welding, electric arc welding, welding and other welding methods. Since the coefficient of expansion and chemical composition of the alloy is related should be avoided due to welding causes a change in the alloy composition, it is preferable to use Argon arc welding welding filler metals preferably contains 0.5% to 1.5% titanium, in order to reduce weld porosity and crack.

    Normal composition%

    Ni 35~37.0 Fe Bal. Co - Si ≤0.3
    Mo - Cu - Cr - Mn 0.2~0.6
    C ≤0.05 P ≤0.02 S ≤0.02

    Coefficient of expansion

    θ/ºC α1/10-6ºC-1 θ/ºC α1/10-6ºC-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

     

    Typical Physical properties

    Density (g/cm3) 8.1
    Electrical resistivity at 20ºC(OMmm2/m) 0.78
    Temperature factor of resistivity(20ºC~200ºC)X10-6/ºC 3.7~3.9
    Thermal conductivity, λ/ W/(m*ºC) 11
    Curie point Tc/ ºC 230
    Elastic Modulus, E/ Gpa 144

     

    The heat treatment process
    Annealing for stress relief Heated to 530~550ºC and hold 1~2 h. Cold down
    annealing In order to eliminate hardening, which be bring out in cold-rolled, cold drawing process. Annealing needs heated to 830~880ºC in vacuum,hold 30 min.
    The stabilization process
    1. In protective media and heated to 830 ºC, hold 20min. ~ 1h, quench
    2. Due to the stress generated by quenching, heated to 315ºC,hold 1~4h.
    Precautions
    1. Can not be hardened by heat treatment
    2. Surface treatment can be sandblasting, polishing or pickling.
    3. Alloy can be used 25% hydrochloric acid pickling solution at 70 ºC to clear oxidized surface

    Typical Mechanical properties

    Tensile Strength Elongation
    Mpa %
    641 14
    689 9
    731 8

    Temperature factor of resistivity

    Temperature range, ºC 20~50 20~100 20~200 20~300 20~400
    aR/ 103 *ºC 1.8 1.7 1.4 1.2 1.0






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