◆1J50 has a rectangular hysteresis loop and high saturation magnetic induction. It is mainly used in magnetic field amplifiers, choke coils, rectifier coils, and computer device components working in medium magnetic fields.
◆1J79 has a high initial magnetic permeability, and is suitable for various transformers, transformers, magnetic amplifiers, choke cores and magnetic shields working in weak magnetic fields.
◆3J53 has a low frequency temperature coefficient in the range of -40-80°C, and is used for the vibrator in the mechanical filter, the reed of the vibration relay and other components.
◆4J29(F15) has a linear thermal expansion coefficient similar to that of hard glass within a certain temperature range, and is used for matching with hard glass in the vacuum industry.
◆4J36 is a special low-expansion iron-nickel alloy with ultra-low expansion coefficient, which is used in the environment requiring extremely low expansion coefficient.
◆4J42 is mainly used in the manufacture of electric vacuum devices, precision instruments, astronomical geodetic equipment with high stability requirements, etc.
| Grade | C | Si | Mn | S | P | Cr | Ni | Mo | Cu | Fe | Al | Co | Ti |
| no greater than | |||||||||||||
| 1J50 | 0.03 | 0.15～0.3 | 0.3～0.6 | 0.02 | 0.02 | - | 49.5～50.5 | － | ≤0.2 | base | — | — | — |
| 1J79 | 0.03 | 0.3～0.5 | 0.6～1.1 | 0.02 | 0.02 | - | 78.5～80.5 | 3.8～4.1 | ≤0.2 | base | — | — | — |
| 3J53 | 0.05 | 0.8 | 0.8 | 0.02 | 0.02 | 5.2～5.8 | 41.5～43 | 0.7～0.9 | — | base | 0.5～0.8 | — | 2.3～2.7 |
| 4J29 | 0.03 | 0.3 | 0.5 | 0.02 | 0.02 | ＜0.2 | 28.5～29.5 | ＜0.2 | ≤0.2 | base | — | 16.8～17.8 | — |
| 4J36 | 0.05 | 0.3 | 0.2～0.6 | 0.02 | 0.02 | - | 35～37 | － | — | base | — | — | — |
| 4J42 | 0.05 | 0.3 | 0.8 | 0.02 | 0.02 | - | 41.5～42.5 | — | — | base | ≤0.1 | ≤1.0 | - |
| Grade | Variety | Magnetic properties | ||
| Initial permeability uo(MH/m) | Maximum Permeability(Uh/m) | Coercivity Hc(A/m) | ||
| 1J79 | Cold rolled strip | ≥31 | ≥250 | ≤1.2 |
| stick wire board | ≥25 | ≥125 | ≤2.4 | |
| 1J50 | Cold rolled strip | ≥3.8 | ≥62.5 | ≤9.6 |
| Forged (rolled) bars | ≥3.1 | ≥31.3 | ≤14.4 | |
| Grade | state | Elastic Modulus E(Mpa) | tensile strength b(N/m㎡) | Hardness Hv |
| 3J53 | cold working + aging | 190000～215600 | 1170～1760 | 400～480 |
| Grade | Average Linear Expansion Coefficient(10-6℃) | ||||||
| 20～100℃ | 20～300℃ | 20～400℃ | 20～450℃ | 20～500℃ | 20～530℃ | 20～600℃ | |
| 4J29 | — | — | 4.6～5.2 | 5.1～5.5 | — | — | — |
| 4J50 | — | 9.2～10 | 9.2～9.9 | — | — | — | — |
| 4J36 | — | ≤1.5 | — | — | — | — | — |
| 4J42 | 5.5 | 4.6 | 5.8 | 6.7 | 7.6 | — | 9.1 |
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