OhmAlloy
-1J79
(
Soft magnetic alloy)
(Common Name:
Ni79Mo4, E11c, malloy,
permalloy
, 79HM
)
Ohmalloy-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
w
idely 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 2
0
ºC
(Om*
mm
2
/m)
|
0.55
|
|
Coefficient of linear expansion(20
ºC
~
2
00
ºC
)X10
-
6
/
ºC
|
10.3~1
1.5
|
|
Saturation magnetostriction coefficient λ
θ
/ 10
-6
|
2.0
|
|
Curie point
T
c
/ ºC
|
450
|
The magnetic properties of alloys with high permeability in weak fields
|
|
1J79
|
Initial permeability
|
Maximum permeability
|
Coercivity
|
Saturation magnetic induction intensity
|
С
old-rolled strip/ sheet.
Thickness, mm
|
μ
0.08
/ (mH/m)
|
μ
m
/ (mH/m)
|
Hc/ (A/m)
|
B
S
/ 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 wir
e
|
|
|
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 300ºC
|
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
|
FAQ
1. What's the minimum quantity customer can order?
If we have your size in stock, we can provide any quantity you want.
If we do not have, for spool wire, we can produce 1 spool, about 2-3kg. For coil wire, 25kg.
2. How can you pay for small sample amount?
We have Western union account, wire transfer for sample amount also ok.
3. Customer do not have express account. How will us arrange the delivery for sample order?
Just need to provide your address information, we will check the express cost, you can arrange the express cost together with sample value.
4. What's our payment terms?
We can accept LC T/T payment terms, it also depending on delivery and total amount. Let's talk more in details after getting your detailed requirements.
5. Do you provide free samples?
If you want several meters and we have stock of your size, we can provide, customer need to bear the International express cost.
6. What's our working time?
We will give you reply through email/phone Online contact tool within 24 hours. No matter working day or holidays.