1J79 Soft Magnetic Alloy Strip UNS K93700 Ultra High Permeability

1J79 Soft Magnetic Alloy Strip (UNS K93700): Ultra‑High Permeability and Stable Performance

1J79 Soft Magnetic Alloy Strip Description

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. 

1J79 Soft Magnetic Alloy Strip Chemical Composition

1J79 Soft Magnetic Alloy Strip Mechanical Properties

1J79 Soft Magnetic Alloy Strip Physical Parameters

1J79 Soft Magnetic Alloy Strip Standards Compliance

Applications of 1J79 Soft Magnetic Alloy Strip

• 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

FAQ: 1J79 Soft Magnetic Alloy Strip

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.