Welcome to Maduka Metals, your trusted partner in Abuja for high-performance materials. We take pride in manufacturing and supplying precision-engineered Permalloy bar and rod, delivering exceptional quality right here in Nigeria. Our commitment is to support the growth of local industries by providing reliable access to these specialized alloys, ensuring your projects benefit from superior magnetic properties and consistent performance. We understand the critical demands of modern engineering and stand ready to meet them with products you can count on.
Permalloy is a nickel-iron alloy, typically composed of about 80% nickel and 20% iron, which gives it its unique soft magnetic characteristics. In terms of mechanical properties, it is a ductile and malleable material, making it well-suited for machining into precise components. While it is not chosen for structural strength, its true value lies in its exceptional magnetic permeability and low coercivity. This means it can be easily magnetized and demagnetized with minimal energy loss, which is its defining feature.
| Standards : | — |
| Thickness : | Range from .008″ to .0125″ |
| Hardness : | Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc. |
| Form : | Bar |
| Tungsten Grades | HA 190 / HA 1925 / HA 195 / HE 390 / HE 3925 / HE 395 / HE 397 |
| C | P | S | Mn | Si | Ni | Cr | Co | Mo | Cu | Fe | |
| 1J46 | ≤0.03 | ≤0.02 | ≤0.02 | 0.6-1.1 | 0.15-0.30 | 45-46.5 | – | – | – | ≤0.2 | Balance |
| 1J50 | ≤0.03 | ≤0.02 | ≤0.02 | 0.3-0.6 | 0.15-0.30 | 49-50.5 | – | – | – | ≤0.2 | Balance |
| 1J79 | ≤0.03 | ≤0.02 | ≤0.02 | 0.6-1.1 | 0.30-0.50 | 78.5-81.5 | – | – | 3.8-4.1 | ≤0.2 | Balance |
| 1J85 | ≤0.03 | ≤0.02 | ≤0.02 | 0.3-0.6 | 0.15-0.30 | 79-81 | – | – | 4.8-5.2 | ≤0.2 | Balance |
| Grade | Resisitivity (μΩ•m) | Desinty (g/cm3) | CuriePoint℃ | HighSaturatedmagneto-strictioncoefficient λθ/10-6 | Brinellhardness HBS | σbTensile Strength MPa | σsYieldStrength MPa | Elongation (%)δ | ||||
| unan- nealed | an- nealed | unan- nealed | an- nealed | unan- nealed | an- nealed | unan- nealed | an- nealed | |||||
| 1J46 | 0.45 | 8.2 | 400 | 25 | 170 | 130 | 735 | 735 | 3 | |||
| 1J50 | 0.45 | 8.2 | 500 | 25 | 170 | 130 | 785 | 450 | 685 | 150 | 3 | 37 |
| 1J79 | 0.55 | 8.6 | 450 | 2 | 210 | 120 | 1030 | 560 | 980 | 150 | 3 | 50 |
| 1J85 | 0.56 | 8.75 | 400 | 0.5 | – | – | – | – | – | – | – | – |
Permalloy bars are generally not highly susceptible to galvanic corrosion, as they have good resistance to corrosion. However, when in contact with dissimilar metals, galvanic corrosion may still occur under certain conditions.
Yes, Permalloy bars can be welded, but due to their high nickel content, specialized welding techniques, such as TIG or laser welding, and proper precautions are necessary to maintain magnetic properties.
Permalloy rods are available in various sizes, typically ranging from 1/16" to 4" in diameter. Common finishes include bright, polished, or cold-drawn finishes, depending on the application requirements.
The primary use for Permalloy bar and rod is in applications where efficient magnetic shielding and sensitive signal handling are crucial. You will find it at the heart of transformers, magnetic amplifiers, and inductors, especially in telecommunications and precision instruments. It is also essential for creating shields that protect sensitive electronic equipment from stray magnetic fields. From advanced laboratory equipment to critical aerospace and defense systems, Permalloy components ensure clarity and reliability, making them indispensable in technology that demands precision.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Maduka Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Abuja, Nigeria
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