Soft Magnetic Alloy 1J85

1J85 is an iron-nickel soft magnetic alloy with very high permeability in weak magnetic fields. The following is a detailed description:

I. Chemical Composition: Nickel content is 79.0%-81.0%, molybdenum content is 4.8%-5.2%, iron is the balance, manganese content is 0.30%-0.60%, silicon content is 0.15%-0.30%, carbon content is no more than 0.03%, phosphorus content is no more than 0.020%, sulfur content is no more than 0.020%, and copper content is no more than 0.20%.

II. Physical Properties: Density is 8.75 g/cm³, resistivity is 0.56 μΩ•m, Curie point is 400℃, and saturation magnetostriction coefficient is 0.5 × 10⁻⁶.

III. Magnetic Properties: For cold-rolled strips with a thickness of 0.005-0.01 mm, the permeability in a 0.08 A/m magnetic field is μ₀.₀₈ ≥ 20.0 mH/m, the maximum permeability μm ≥ 87.5 mH/m, the coercivity Hc ≤ 4.8 A/m, and the saturation magnetic induction Bs is 0.70 T.  These performance indicators will change with increasing strip thickness. For hot-rolled (forged) flat bars and rods, the permeability in a 0.08 A/m magnetic field is μ₀.₀₈ ≥ 37.5 mH/m, the maximum permeability μm ≥ 125 mH/m, the coercivity Hc ≤ 1.6 A/m, and the saturation magnetic induction Bs is 0.70 T.

IV. Main Characteristics: It has extremely high permeability, extremely low coercivity, and low magnetostriction. It can efficiently conduct magnetism under weak magnetic fields, has very low hysteresis loss, and has high resistivity, which can reduce eddy current loss.