1J79 strip Precision soft magnetic alloy bright strip 79 HM for
Precision instrumentation
Classification: precision soft magnetic alloy
Supplement: Alloy with high permeability in weak fields at saturation
induction 0.65-0.75 T. Alloy 1J79/ permally high squareness of the
hysteresis loop and a low coefficient of magnetization reversal
Application: For small cores of transformers, chokes and relays operating in
weak fields, magnetic shields. In the small thickness (0.05 ± 0.02
mm) - cores for pulse transformers, magnetic amplifiers and solid
state relays
Chemical Composition,%:
Ni
78.5 - 80% |
Fe
13.73 - 16.8% |
C
0.03% |
Si
0.3 - 0.5% |
Mn
0.6 - 1.1% |
S
o 0.02% |
P
0.02% |
Mo
3.8 - 4.1% |
Ti
0.15% |
Al
0.15% |
Cu
0.2% | |
Basic physical constants and mechanical properties of the alloy:
Density: γ = 8,6 g / cm3;
Electric resistivity: ρ = 0,55 ohm mm2 ? / m;
The temperature of the Curie point: Θs = 430 ° C;
Saturation magnetostriction: λS = 2 ? 106;
Brinell hardness of 210/120 HB;
Ultimate: RM = 1030/490 MPa;
Yield strength: σ0,2 = 980 145 MPa;
Modulus of elasticity E = 210 kN / mm2;
Elongation: δ5 = 3/50%;
Relative compression: φ = -%.
Heat treatment of the alloy
| Annealing | Temperature and heating rate | Holding time, h | Cooling mode |
| Vacuum with a residual pressure not higher than 10-3 Torr. Art. or
pure hydrogen with a dew point of not higher than minus 40 ° C. | (1125 ± 25) ° C not higher than 500 ° C / h | 3-6 | to 600 ° C at a rate not exceeding 200 ° C / h from 600 to 200 ° C
at a rate of at least 400 ° C / h |
