1J85 High-Permeability Soft Magnetic Nickel-Iron Alloy

Short Description:

1J85 Soft Magnetic Alloy Overview 1J85 is a high-nickel iron-molybdenum soft magnetic alloy developed for high permeability and low magnetic loss after suitable forming and final magnetic annealing. It is used where weak magnetic signals must be concentrated, guided or shielded with minimal hysteresis. Magnetic performance is not controlled by chemistry alone. Strip thickness, cold work, component geometry, surface condition, forming stress, furnace atmosphere, annealing…

Grade:: 1J85 High-Permeability Soft Magnetic Nickel-Iron Alloy
Standard:: ASTM A753
Surface:: Mill finish, pickled, polished, or as required
Diameter:: Not applicable

Send email to us

Product Detail

Product Tags

1J85 Soft Magnetic Alloy Overview

1J85 is a high-nickel iron-molybdenum soft magnetic alloy developed for high permeability and low magnetic loss after suitable forming and final magnetic annealing. It is used where weak magnetic signals must be concentrated, guided or shielded with minimal hysteresis.

Magnetic performance is not controlled by chemistry alone. Strip thickness, cold work, component geometry, surface condition, forming stress, furnace atmosphere, annealing cycle and post-annealing handling can materially affect permeability and coercivity. Required magnetic values and the test method must be stated before production.

1J85 Product Specification

Item	Supply Reference
Grade	1J85
Alloy family	High-permeability nickel-iron-molybdenum soft magnetic precision alloy
Nominal nickel range	79–81% in the reference composition shown below
Primary product forms	Cold-rolled strip, thin sheet, foil and customer-specified laminations or formed components
Critical supply condition	Cold-worked or magnetic-annealed condition according to the agreed manufacturing route
Order basis	Dimensions, tolerances, condition, magnetic-property requirement, test method and certification

Supply Forms and Custom Processing

Supply Form	Information Required
Cold-rolled strip	Thickness, width, tolerance, coil inside diameter, coil weight and edge condition
Thin sheet and foil	Thickness, sheet size, flatness, surface and protective packing
Laminations and stamped parts	Drawing, burr direction, stamping allowance, stacking method and final magnetic condition
Formed shielding components	Geometry, seams, joining method, annealing sequence and magnetic acceptance criteria

1J85 Technical Data and Grade Comparison

The following chemical-composition table retains the original 1J50, 1J79 and 1J85 comparison data. It is provided for grade identification only; the ordered grade and applicable acceptance limits must be confirmed separately.

Grade	C	S	P	Mn	Si	Ni	Mo	Cu	Fe
1J50	≤0.03	≤0.02	≤0.02	0.3–0.6	0.15–0.3	49–50.5	—	≤0.2	Balance
1J79	≤0.03	≤0.02	≤0.02	0.6–1.1	0.3–0.5	78.5–80	3.8–4.1	≤0.2	Balance
1J85	≤0.03	≤0.02	≤0.02	0.3–0.6	0.15–0.3	79–81	4.8–5.2	≤0.2	Balance

Magnetic Performance Factor	Why It Matters
Final magnetic annealing	Relieves forming stress and develops the required soft-magnetic structure; cycle and atmosphere must be controlled
Material thickness	Influences eddy-current behavior, forming response and the test specimen used for acceptance
Component geometry	Sharp bends, gaps, burrs and joints can reduce effective shielding or core performance
Post-annealing handling	Mechanical shock, bending or machining after final annealing can introduce stress and change magnetic properties
Test conditions	Field strength, frequency, specimen shape and measurement direction must match the agreed acceptance method

Discuss 1J85 Thickness and Magnetic Requirements

1J85 Applications

Application Area	Typical Components
Magnetic shielding	Enclosures, sleeves and formed shields for sensitive instruments and electronic assemblies
Transformers and inductive devices	Instrument-transformer cores, pulse transformers, chokes and low-signal magnetic circuits
Sensors and transducers	Magnetic cores and flux-guiding components for measurement and control devices
Recording and communication equipment	Head laminations, relay parts and selected high-permeability components
Laboratory and precision equipment	Low-field magnetic circuits and shielding assemblies requiring controlled magnetic response

Quality Inspection and Documentation

Inspection Item	Available Review
Material identity	Chemical composition, grade and heat / batch traceability
Dimensions	Thickness, width, flatness, tolerances, coil dimensions and burr condition
Surface	Visual inspection for scratches, oxidation, contamination and handling damage
Magnetic properties	Permeability, coercivity or other agreed parameters under the specified test conditions
Process records	Heat-treatment condition and additional inspection documents when required by the order

Packaging and Export Delivery

Strip and foil	Coil protection, interleaving where required, moisture barrier and rigid outer packing
Sheet and laminations	Flat stacking, surface separation and edge protection to prevent distortion and burr damage
Annealed components	Non-magnetic handling fixtures and protective spacing can be reviewed to reduce mechanical damage
Identification	Grade, dimensions, heat / batch reference, condition, net weight and order number

RFQ Confirmation Checklist

Please Provide	Required Detail
Product form	Strip, sheet, foil, lamination or finished component
Dimensions	Thickness, width, length, tolerances, coil ID / OD and quantity
Supply condition	Cold-worked, intermediate condition or final magnetic annealing requirement
Magnetic acceptance	Required parameter, test method, frequency / field strength and specimen geometry
Quality and delivery	Certificate, inspection, marking, packing and destination