Chemical composition
Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements3 elements | |||
| Ni | Nickel | 79 – 82% | |
| Fe | Iron | Bal. | |
| Mo | Molybdenum | 3.5 – 6% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual8 elements | |||
| C | Carbon | ≤ 0.05% | |
| Mn | Manganese | ≤ 0.8% | |
| Si | Silicon | ≤ 0.5% | |
| P | Phosphorus | ≤ 0.02% | |
| S | Sulphur | ≤ 0.01% | |
| Cr | Chromium | ≤ 0.3% | |
| Co | Cobalt | ≤ 0.5% | |
| Cu | Copper | ≤ 0.3% | |
Magnetic properties
Guaranteed values required by the standard, by product form and size band, measured on specimens after the final magnetic anneal.
| Form | Condition and size band | μ4mT ≥ | μ10mT ≥ | μmax ≥ | Hc ≤ (A/m) |
|---|---|---|---|---|---|
| Bar, wire, plate and coil | After the final magnetic anneal, either size band (d >12.7 mm or d ≤12.7 mm) | 35000 | 42000 | 175000 | 2 |
| Sheet and strip | After final magnetic heat treatment, t 1.52–4.75 mm | 35000 | 42000 | 200000 | 2 |
| Sheet and strip | After final magnetic heat treatment, t: 0.51<d<1.52 mm | 55000 | 70000 | 250000 | 1.2 |
The magnetic anneal is normally agreed between supplier and purchaser and varies with size; state the form, size band and the magnetic properties to be tested on the order.
Mechanical minima by form
Guaranteed values differ by form, size and delivery condition; quotations confirm the specification, form, size and condition.
| Form | Condition | Rm MPa | Rp0.2 MPa | A ≥ % | Other requirements and notes |
|---|---|---|---|---|---|
| Cold-rolled hard-temper strip | t ≤2.54 mm, informative typical values | — | — | — | Typical, informative: Rm 1100 MPa · Rp0.2 1030 MPa · A 2 % |
| Mill-annealed strip | t ≤2.54 mm, informative typical values | — | — | — | Typical, informative: Rm 580 MPa · Rp0.2 220 MPa · A 40 % |
Where this grade is recommended
Matched in 2 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Magnetic shielding & soft-magnetic parts | Semiconductor & Vac-Electronics | ≤ 120 °C | 2 / 5 | 93 |
| Motor cores & pole pieces | Automotive & Racing | ≤ 180 °C | 4 / 4 | 78 |
Designations & equivalents
| Trade name(s) | 4-79 Permalloy / MoPermalloy / HyMu 80 / Vacoperm 100 |
| GOST (Russia) | ≈ 79НМ |
Cross-references are common near-equivalents for search and shortlisting; substitution across standards requires clause-by-clause verification. All grades in one cross-reference table →
Applicable standards
Name the standard and its edition on the order.
Frequently asked questions
What is 1J79 Permalloy (80Ni)?
1J79 Permalloy (80Ni) — Precision alloys. High initial permeability permalloy — weak-signal magnetic shielding and recording heads
What is the maximum service temperature of 1J79?
Typically about 400 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
Which standards cover 1J79?
ASTM A753-21
Where is 1J79 typically used?
Magnetic shielding & soft-magnetic parts (Semiconductor & Vac-Electronics); Motor cores & pole pieces (Automotive & Racing)
In which forms is 1J79 available?
Tube, plate, strip, bar, forgings, wire and other forms — sizes and delivery condition confirmed per order, with EN 10204 3.1 / 3.2 certification.
Same series
Download PDF datasheet
This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.
Download PDF datasheetSupply & enquiry
Tube & pipeφ1 – 219 × 0.25 – 25 mm
Plate4.76 – 80 mm
Barφ8 – 300 mm
Wire & filler metalsφ0.01 – 8 mmFor this grade we can supply, against your service conditions:
- Tube, plate, strip, bar, forgings, wire and more — with size range and lead time
- Chemistry and mechanical test report (EN 10204 3.1 / 3.2)
- Like-for-like alternatives and selection advice
- Applicable standards and inspection scope
Or email us: info@kochlin.com