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1J79 Permalloy Wire Ni79Mo4 Annealed 0.05-1.5mm Soft Magnetic Nickel Iron Alloy for Magnetic Shielding Braid
| Place of Origin | Shanghai, China |
|---|---|
| Brand Name | HUONA |
| Certification | ISO 9001:2015 |
| Model Number | 1J79 |
| Minimum Order Quantity | 5 Kilograms |
| Price | USD 35-95 / Kilogram |
| Packaging Details | Layer wound on spool, VCI paper and desiccant, sealed foil bag, export plywood case |
| Delivery Time | 7-10 working days for stock diameters, 20-25 days for custom sizes |
| Payment Terms | T/T,L/C,Western Union |
| Supply Ability | 20 Tons per Month |
Product Details
| Grade | 1J79 / Ni79Mo4 / Permalloy 79 | Nickel Content | 78.5-80.0% |
|---|---|---|---|
| Molybdenum Content | 3.8-4.1% | Wire Diameter | 0.05-1.5mm (customizable) |
| Diameter Tolerance | +/-0.005mm | Tensile Strength | 520-690 MPa |
| Hardness | 150-220 HV | Elongation | >= 30% |
| Density | 8.6-8.7 G/cm3 | Electrical Resistivity | 0.55-0.62 UOhm.m At 20 C |
| Initial Permeability | 30000 Typical | Maximum Permeability | 200000 Typical |
| Coercivity | <= 1.6 A/m | Saturation Induction | 0.75 T |
| Curie Temperature | Approx. 450 C | Surface Finish | Bright Annealed, Polished |
| Spool Weight | 0.1-20 Kg Per Spool | Standard | GB/T 15002-1994, ASTM A753 |
| Highlight | Ni79Mo4 Annealed Permalloy Wire,Magnetic Shielding Braid Wire 0.05mm,Low Coercivity Relay Reed Wire |
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Product Description
Product Overview
1J79 permalloy wire (also designated Ni79Mo4, 79HM, E11c) is a nickel-iron soft magnetic alloy wire containing approximately 79% nickel and 3.8–4.1% molybdenum. In the annealed condition, it achieves very high initial and maximum permeability, maintains extremely low coercivity, and delivers excellent magnetic shielding performance. Because the wire is soft, ductile, and dimensionally accurate, it is widely used for braided shielding sleeves, relay reeds, precision sensor coils, and small transformer windings.
We draw the wire from vacuum-melted 1J79 billet, then anneal it in dry hydrogen so that carbon, sulphur, and residual stress remain under control. Every lot is checked for chemistry, diameter tolerance, and magnetic response before packing. Customers can order bright annealed wire for direct winding, or soft temper wire for braiding and forming. Diameters from 0.05 mm to 1.5 mm are standard, and non-standard diameters, flat wire, and ribbon are produced to drawing.
Chemical Composition (wt. %)
| Element | Ni | Mo | Mn | Si | C | P | S | Fe |
|---|---|---|---|---|---|---|---|---|
| Specification | 78.5–80.0 | 3.8–4.1 | 0.6–1.1 | 0.3–0.5 | ≤ 0.03 | ≤ 0.02 | ≤ 0.02 | Balance |
Physical and Magnetic Properties (after hydrogen anneal)
| Parameter | Value | Remark |
|---|---|---|
| Density | 8.6–8.7 g/cm³ | Room temperature |
| Electrical resistivity | 0.55–0.62 µΩ·m | at 20 °C |
| Curie temperature | approx. 450 °C | Magnetic ordering limit |
| Saturation induction (Bs) | approx. 0.75 T | Typical |
| Initial permeability (µi) | 30,000 typical | Measured after anneal |
| Maximum permeability (µmax) | 200,000 typical | Measured after anneal |
| Coercivity (Hc) | ≤ 1.6 A/m | Annealed state |
| Tensile strength | 520–690 MPa | Cold drawn |
| Elongation | ≥ 30% | Annealed |
| Hardness | 150–220 HV | Annealed |
| Max service temperature | 450 °C | Continuous, protective atmosphere recommended |
Available Forms and Sizes
| Form | Size Range | Tolerance | Finish |
|---|---|---|---|
| Round wire | φ 0.05–1.5 mm | ±0.005 mm | Bright annealed / polished |
| Flat wire and ribbon | Thickness 0.05–1.0 mm, width 0.2–6 mm | ±0.01 mm | Bright, deburred edge |
| Straight cut length | 50–1000 mm | ±0.5 mm | Annealed, straight |
| Spool supply | 0.1–20 kg per spool | — | Layer wound, no kinks |
Typical Applications
- Braided and knitted magnetic shielding sleeves for cables and harnesses
- Reed switch blades, relay reeds, and electromagnetic actuators
- Precision sensor coils, current transformers, and small transformer windings
- Instrument transformers and measuring equipment magnetic circuits
- Medical diagnostic devices and aerospace electronic assemblies
- Laboratory shielding rooms, shielding foil edges, and grounding braid
Why This Wire Works for Shielding Braid
- High permeability at low field strength, so thin braid layers still block low-frequency interference
- Low coercivity and narrow hysteresis loop keep signal distortion minimal
- Soft annealed temper bends without cracking during braiding and knitting
- Consistent diameter keeps braid coverage uniform and machine feeding stable
- Controlled chemistry means repeatable magnetic performance between lots
Quality Control
| Stage | Check |
|---|---|
| Raw material | Spectrochemical analysis of Ni, Mo, Mn, Si, C, P, S |
| Melting | Vacuum induction melting, low gas content |
| Drawing | Multi-pass drawing with intermediate anneal, diameter laser gauging |
| Final anneal | Dry hydrogen atmosphere, dew point monitored |
| Magnetic test | Permeability and coercivity sampling per lot |
| Inspection | ISO 9001:2015 quality system, SGS or third-party inspection on request |
Packing and Delivery
Wire is layer wound on plastic or wooden spools, interleaved with VCI paper, sealed in aluminium foil bags with desiccant, then packed in export-grade plywood cases. Spool weight, labeling, and case marking follow customer requirements. Stock diameters ship in 7–10 working days; custom diameters and flat wire take 20–25 days after deposit.
Ordering Information
Please specify diameter, temper (bright annealed or soft), spool weight, surface finish, and estimated annual quantity. Sample coils of 1–2 kg are available for magnetic and braiding trials. Send your specification and we will confirm price, lead time, and packing the same working day.
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