China 1j79 Magnetic Alloy Strip Ni50 Hy-Ra49

1J79 is a nickel-iron magnetic alloy, with about 80% nickel and 20% iron content. InventPlastic Machinery ed in 191Building Hardware 4 by physicist Gustav Elmen at Bell Telephone Laboratories, it is notable for its very high magnetic permeability, which makes it useful as a magnetic core material in electrical and electronic equipment, and also in magnetic shielding to block magnetic fields. Commercial permalloy alloys typically have relative permeability of around 100,000, compared to several thousand for ordinary steel.
In addition to high permeability, its other magnetic properties are low coercivity, near zero magnetostriction, and significant anisotropic magnetoresistance. The low magnetostriction is critical for industrial applications, allowing it to be used in thin films where variable stresses would otherwise cause a ruinously large variation in magnetic properties. Permalloy's electrical resistivity can vary as much as 5% depending on the strength and the direction of an applied magnetic field. Permalloys typically have the face centered cubic crystal structure with a lattice constant of approximately 0.3Ball Screw 55 nm in the vicinity of a nickel concentration of 80%. A disadvantage of permalloy is that it is not very ductile or workable, so applications requiring elaborate shapes, such as magnetic shields, are made of other high permeability alloys such as mu metal. Permalloy is used in transformer laminations and magnetic recording heads.
Ohmalloy-1J79 widely used in radio-electronic industry, precision instruments, remote control and automatic control system.Normal composition%Ni78.5~80.0FeBal.Mn0.6~1.1Si0.3~0.5Mo3.8~4.1Cu≤0.2C≤0.03P≤0.02S≤0.02
Typical Mechanical propertiesYield strengthTensile StrengthElongationMpaMpa%98010303~50
Typical Physical propertiesDensity (g/cm3)8.6Electrical resistivity at 20ºC(Om*mm2/m)0.55Coefficient of linear expansion(20ºC~200ºC)X10-6/ºC10.3~11.5Saturation magnetostriction coefficient λθ/ 10-62.0Curie point Tc/ ºC450
The magnetic properties of alloys with high permeability in weak fields1J79Initial permeabilityMaximum permeabilityCoercivitySaturation magnetic induction intensityСold-rolled strip/ sheet.
Thickness, mmμ0.08/ (mH/m)μm/ (mH/m)Hc/ (A/m)BS/ T≥≤0.01 mm17.587.55.60.750.1~0.19 mm25.0162.52.40.2~0.34 mm28.0225.01.60.35~1.0 mm30.0250.01.61.1~2.5 mm27.Manufacturing & Processing Machinery 5225.01.62.6~3.0 mm26.3187.52.0cold drawn wire0.1 mm6.3506.4Leather Machinery Bar8-100 mm251003.2Mode of heat treatment 1J79Annealing mediaVacuum with a residual pressure not higher than 0.1Pa, hydrogen with a dew point of not higher than minus 40 ºC.The heating temperature and rate1100~1150ºCHolding time3~6Cooling rateWith 100 ~ 200 ºC/ h cooled to 600 ºC, rapidly cooled to 300º
Style of supplyAlloys NameTypeDimensionOhmAlloy-1J79WireD= 0.1~8mmOhmAlloy-1J79StripW= 8~390mmT= 0.3mmOhmAlloy-1J79FoilW= 10~100mmT= 0.01~0.1OhmAlloy-1J79BarDia= 8~100mmL= 50~1000