China 4j36 Invar Alloy Sheet Invar Strip Ni36

4j36 INVAR alloy wire Low Expansion AlElectronic Instrument loy FeNi36 wire
Classification : low coefficient of thermal expansion alloy

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).4J36 (Invar) is used where high dimensional stability is required, to the as precision instruments, clocks, and seismic is creep gauges, television shadow mask - frames, and valves in motors,And antimagnetic watches. In land Surveying, when first order (precision) was to be performed, the Level staff (rod) used is made of Invar, instead of wood, fiberglass,Or other metals. Invar struts were 2 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%

Ni35~37.0FeBal.Co-Si≤0.3MoLED Video Processor -Cu-Conveyor & Parts Cr-Mn0.2~0.6Watch Box C≤0.05P≤0.02S≤0.02

Coefficient of expansion

θ/ºCα1/10-6ºC-1θ/ºCα1/10-6ºC-120~-601.820~2503.620~-401.820~3005.220~-201.620~3506.520~-01.620~4007.820~501.120~4508.920~1001.420~5009.720~1501.920~55010.420~2002.520~60011.0

Typical Physical properties:

Density (g/cm3)8.1Electrical resistivity at 20ºC(OMmm2/m)0.78Temperature factor of resistivity(20ºC~200ºC)X10-6/ºC3.7~3.9Thermal conductivity, λ/ W/(m*ºC)11Curie pointTc/ºC230Elastic Modulus,E/ Gpa144

The Hear Treatment Process:

Annealing for stress reliefHeated to 530~550ºC and hold 1~2 h. Cold downannealingIn 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 processIn protective media and heated to 830 ºC, hold 20min. ~ 1h, quenchDue to the stress generated by quenching, heated to 315ºC,hold 1~4h.PrecautionsCan not be hardened by heat treatmentSurface treatment can be sandblasting, polishing or pickling.Alloy can be used 25% hydrochloric acid pickling solution at 70 ºC to clear oxidized surface

Typical Mechanical properties :

Tensile StrengthElongationMpa%6411468997318

Temperature factor of resistivity:

Temperature range, ºC20~5020~10020~20020~30020~400aR/ 103*ºC1.81.71.41.21.0