• 1j79 Soft Magnetic Alloys Strip
  • 1j79 Soft Magnetic Alloys Strip
  • 1j79 Soft Magnetic Alloys Strip
  • 1j79 Soft Magnetic Alloys Strip
  • 1j79 Soft Magnetic Alloys Strip

1j79 Soft Magnetic Alloys Strip

Standard: GB, DIN, ASTM
Purity: 81%
Shape: Square
Alloy: Alloy
Secondary: Non-secondary
Sample: Free
Customization:
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Basic Info.

Model NO.
1J79
Surface
Bright
OEM
Yes
Density, g/cm3
8.6
Curie Point Tc/ ºC
450
Certificate
SGS, ISO, RoHS
Resistivity(μΩ.M)
0.55
Saturation Magnetostriction Coefficient
2
Thickness
0.1~10.0 mm
Transport Package
Wooden Case
Specification
0.7mm
Trademark
Huonar
Origin
Shanghai
HS Code
7204290000
Production Capacity
50ton/Month

Product Description

1J79 is a nickel-iron magnetic alloy, with about 80% nickel and 20% iron content. Invented in 1914 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 0.355 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%
Ni 78.5~80.0 Fe Bal. Mn 0.6~1.1 Si 0.3~0.5
Mo 3.8~4.1 Cu ≤0.2        
C ≤0.03 P ≤0.02 S ≤0.02    

Typical Mechanical properties
Yield strength Tensile Strength Elongation
Mpa Mpa %
980 1030 3~50

Typical Physical properties
Density (g/cm3) 8.6
Electrical resistivity at 20ºC(Om*mm2/m) 0.55
Coefficient of linear expansion(20ºC~200ºC)X10-6/ºC 10.3~11.5
Saturation magnetostriction coefficient λθ/ 10-6 2.0
Curie point   Tc/ ºC 450
 
The magnetic properties of alloys with high permeability in weak fields
1J79 Initial permeability Maximum permeability Coercivity Saturation magnetic induction intensity
Сold-rolled strip/ sheet.
Thickness, mm
μ0.08/ (mH/m) μm/ (mH/m) Hc/ (A/m) BS/ T
0.01 mm 17.5 87.5 5.6  
 
 
 
 
 
 
 
 
 
0.75
0.1~0.19 mm 25.0 162.5 2.4
0.2~0.34 mm 28.0 225.0 1.6
0.35~1.0 mm 30.0 250.0 1.6
1.1~2.5 mm 27.5 225.0 1.6
2.6~3.0 mm 26.3 187.5 2.0
cold drawn wire  
0.1 mm 6.3 50 6.4
Bar  
8-100 mm 25 100 3.2
 
Mode of heat treatment  1J79
Annealing media Vacuum 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 rate 1100~1150ºC
Holding time 3~6
Cooling rate With 100 ~ 200 ºC/ h cooled to 600 ºC, rapidly cooled to 300º

Style of supply
Alloys Name Type Dimension  
OhmAlloy-1J79 Wire D= 0.1~8mm  
OhmAlloy-1J79 Strip W= 8~390mm T= 0.3mm
OhmAlloy-1J79 Foil W= 10~100mm T= 0.01~0.1
OhmAlloy-1J79 Bar Dia= 8~100mm L= 50~1000
1j79 Soft Magnetic Alloys Strip
 

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