1j79 Soft Magnetic Alloys Strip

• Customization: Available
• Standard: GB, DIN, ASTM
• Purity: 81%
• Model NO.: 1J79
• Shape: Square
• Alloy: Alloy
• Secondary: Non-secondary
• Sample: Free
• 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