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Nife 36 Nickel Iron Invar Alloy Strip1
Nickel Alloy, Invar 36, Invar 36 Strip
Huona (Shanghai) New Material Co., Ltd.
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Product Description NiFe 36 Nickel Iron Invar Alloy Strip(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).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%Ni35~37.0FeBal.Co-Si≤0.3Mo-Cu-Cr-Mn0.2~0.6C≤0.05P≤0.02S≤0.02 Coefficient of expansionθ/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 propertiesDensity (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 point Tc/ oC230Elastic Modulus, E/ Gpa144 The heat treatment processAnnealing 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 surfaceTypical Mechanical propertiesTensile StrengthElongationMpa%6411468997318Temperature factor of resistivityTemperature range, oC20~5020~10020~20020~30020~400aR/ 103 *oC1.81.71.41.21.0
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