Wuxi Nickel Alloy New Material Technology Co., Ltd
Wuxi Nickel Alloy New Material Technology Co., Ltd
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1J79 Soft Magnetic Alloy Strip (UNS K93700): Ultra‑High Permeability and Stable Performance
1J79 Soft Magnetic Alloy Strip—also known as Permalloy 79 or Ni79Mo4—is a high‑nickel, nickel‑iron‑molybdenum precision strip engineered for critical electromagnetic components. With 79–80 wt % nickel and 3.8–4.1 wt % molybdenum, this strip achieves ultra‑high initial permeability (> 20 000 mH/m) and low coercivity (< 2.0 A/m), while delivering saturation flux density up to 0.75 T with minimal hysteresis and eddy‑current losses. Cold‑rolled to tight tolerances down to 0.005 mm and hydrogen‑annealed for a fine‑grain microstructure, it offers tensile strength ≥ 560 MPa and elongation ≥ 35%, ensuring robustness during stamping and winding. A Curie temperature near 450 °C and thermal expansion coefficient around 11 × 10⁻⁶ /°C guarantee dimensional stability from –40 °C to +120 °C. Conforming to GB/T 198‑1988 and ASTM A753, 1J79 strip excels in precision transformers, pulse inductors, magnetic amplifiers, and shielding across South Asia’s monsoons, the Middle East’s arid zones, Europe’s instrumentation, and the Americas’ aerospace and automotive systems.
| Element | C (≤ %) | P (≤ %) | S (≤ %) | Mn (wt %) | Si (wt %) | Ni (wt %) | Mo (wt %) | Cu (≤ %) | Fe (Balance) |
|---|---|---|---|---|---|---|---|---|---|
| Range | 0.03 | 0.02 | 0.02 | 0.60–1.10 | 0.30–0.50 | 78.5–80.0 | 3.8–4.1 | 0.20 | – |
| Property | Value |
|---|---|
| Tensile Strength (annealed, MPa) | ≥ 560 |
| Elongation (annealed, %) | ≥ 35 |
| Brinell Hardness (annealed, HB) | ≤ 205 |
| Parameter | Value |
|---|---|
| Density (g/cm³) | 8.6 |
| Melting Point (°C) | 1 397–1 427 |
| Curie Temperature (°C) | ~ 450 |
| Coefficient of Thermal Expansion (20–100 °C, /°C) | 11 × 10⁻⁶ |
| Electrical Resistivity (µΩ·cm at 20 °C) | 55 |
| Thermal Conductivity (W/m·°C) | 13.4 |
| Standard | Designation & Scope |
|---|---|
| GB/T 198‑1988 | Soft magnetic Fe–Ni alloy technical conditions |
| ASTM A753 | Specification for Permalloy 80 strip |
| IEC 60404‑8‑6 | Soft magnetic metallic materials specifications |
| UNS K93700 | Unified Numbering System designation for Permalloy 79 |
Precision Transformers & Pulse Inductors: Minimizes core losses in power conversion
Magnetic Amplifiers & Regulators: High linearity in control circuits
Magnetic Shielding: Low‑frequency field attenuation in enclosures
Current Transformers & Choke Coils: Stable performance in metering and filtering
Stepper Motors & Sensors: Consistent magnetic response in automotive and aerospace
Q1: What thickness range is available for 1J79 Soft Magnetic Alloy Strip?
A1: Cold‑rolled strip is offered from 0.005 mm up to 2.00 mm thickness; custom widths to 200 mm can be produced.
Q2: How should 1J79 strip be annealed to optimize magnetic properties?
A2: Anneal in vacuum or dry hydrogen (dew point ≤ –40 °C) at 1 100–1 150 °C for 3–6 h, then cool at 100–200 °C/h to 600 °C and ≥ 400 °C/h thereafter.
Q3: Which environments can 1J79 maintain stable magnetic performance?
A3: Resistant to humidity, saline mist, and hydrazine; maintains permeability and saturation from –40 °C to +120 °C.
Q4: How is 1J79 strip typically packaged for protection?
A4: Wrapped in moisture‑barrier paper, sealed in anti‑corrosion film, and wound on wooden spools or pallets to prevent deformation and oxidation.
Q5: Which industries benefit most from 1J79 strip?
A5: Power generation, electronics, automotive, aerospace, medical imaging, and precision instrumentation rely on its low‑loss, high‑flux performance.