Ohmalloy Material Co., Ltd.  

Product Name: Ohmalloy Bright Invar 36 Strip 0.2mmx110mm for Sealing Instruments Model NO.: Invar Strip Hole: 0 ET: 0~100 PCD: 0~100 Carbon Content: Low Carbon Material: Feni Alloy Product Type: Strip Thickness: 0.05~5mm Width: 10-250mm Condition: Bright Surface, Soft Magnetic Properties: Less Than 230 Celsius Is Ferromagnetic. Heat Treatment: Done Weight Coil: 10~50 Kg Trademark: OhmAlloy-4J36 Transport Package: Coil+ Waterproof Paper+ Wooden Case Specification: SGS HS Code: 722699900 Product Description OhmAlloy-4J36 (Expansion alloy)(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)OhmAlloy-4J36 (Invar), also known generically as FeNi36 (64FeNi in the US), is anickel-iron alloy notable for its uniquely low coefficient of thermal expansion (CTE or α).It was invented in 1896 by Swiss physicist Charles Édouard Guillaume. He received the Nobel Prize in Physics in 1920 for this discovery, which enabled improvements in scientific instruments.OhmAlloy-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.Normal composition%Ni35~37.0FeBal.Co-Si≤0.3Mo-Cu-Cr-Mn0.2~0.6C≤0.05P≤0.02S≤0.02Typical Physical propertiesDensity (g/cm3)8.1Electrical resistivity at 20ºC(mm2/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/ Gpa144Coefficient of expansionθ/ºCα1/10-6ºC-1θ/ºCα1/10-6ºC-120~-601.820~2503.620~-401.820~3005.220~-201.620~3506.520~-01.620~4007.820~501.120~4508.920~1001.420~5009.720~1501.920~55010.420~2002.520~60011.0Typical Mechanical propertiesTensile StrengthElongationMpa%6411468997318Temperature factor of resistivityTemperature range, ºC20~5020~10020~20020~30020~400aR/ 103 *ºC1.81.71.41.21.0The 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 surfaceStyle of supplyAlloys NameTypeDimensionOhmAlloy-4J36WireD= 0.1~8mmOhmAlloy-4J36StripW= 5~250mmT= 0.1mmOhmAlloy-4J36FoilW= 10~100mmT= 0.01~0.1OhmAlloy-4J36BarDia= 8~100mmL= 50~1000Good luck to you!