4J50 Soft Magnetic Alloy Wire for Transformer and Inductor Cores

4J50 Soft Magnetic Alloy Wire for Transformer and Inductor Cores

Brand Name:DLX Place of Origin:China Jiangsu Delivery Time:7-15 Days
Certification:CE,ROHS Supply Ability:500 tons per month
Payment Terms:L/C,T/T,Western Union,MoneyGram

Classification：

Soft Magnetic Alloy Wire

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Product Introduction

4J50, also known as a nickel–iron Soft Magnetic Alloy , is widely used in transformer cores, magnetic shielding, and inductive components that require stable magnetic permeability and low coercivity. At DLX Alloy, we specialize in producing 4J50 soft magnetic alloy wire with high purity, uniform grain structure, and precise dimensional control, ensuring consistent performance across demanding industrial applications.

For more details, pls directly contact us.

4J50 is composed of approximately 50% nickel and 50% iron, giving it excellent magnetic softness and stability under low magnetic field strength. The alloy maintains high permeability and low hysteresis loss, making it ideal for alternating magnetic field environments. It exhibits a Curie temperature around 500°C, which allows it to perform reliably under moderate thermal conditions without significant magnetic degradation.

Its key features include:

High magnetic permeability
Low coercive force
Stable magnetic performance over a wide temperature range
Good corrosion and oxidation resistance under controlled environments

DLX Alloy uses precision melting, hot rolling, and fine wire drawing processes to achieve tight tolerance and stable microstructure. These steps ensure that the alloy’s magnetic properties remain consistent from batch to batch.

Alloy Composition Table

Alloy Grades	C	S	P	Mn	Si	Ni	Cr	Co	Mo	Cu	Al	Nb	Fe	Other Elements
1J06	0.04	0.015	0.015	≤0.10	≤0.15	-	-	-	-	-	5.5-6.5	-	Rest	-
1J12	0.03	0.015	0.015	≤0.10	≤0.15	-	-	-	-	-	11.6-12.4	-	Rest	-
1J17	0.03	0.02	0.02	≤0.60	≤0.20	-	15.5-16.5	-	-	-	-	-	Rest	-
1J18	0.03	0.02	0.02	0.3-0.7	≤0.15	0.5-0.7	17-18.5	-	-	-	-	-	Rest	Ti: 0.3-0.7
1J22	0.04	0.02	0.02	≤0.3	≤0.3	≤0.5	-	49-51	-	≤0.2	-	-	Rest	V: 0.8-1.8
1J30	0.04	0.02	0.02	≤0.40	≤0.30	29.5-30.5	-	-	-	-	-	-	Rest	-
1J36	0.03	0.02	0.02	≤0.60	≤0.20	35.0-37.0	-	-	-	-	-	-	Rest	-
1J38	0.03	0.05	0.02	0.3-0.6	0.15-0.3	37.5-38.5	12.5-13.5	-	-	-	-	-	Rest	-
1J46	0.03	0.02	0.02	0.6-1.1	0.15-0.3	45.0-46.5	-	-	-	≤0.2	-	-	Rest	-
1J50	0.03	0.02	0.02	0.3-0.6	0.15-0.3	49-50.5	-	-	-	≤0.2	-	-	Rest	-
1J51	0.03	0.02	0.02	0.3-0.6	0.15-0.3	49-50.5	-	-	-	≤0.2	-	-	Rest	-
1J54	0.03	0.02	0.02	0.3-0.6	1.1-1.4	49.5-51	3.8-4.2	-	-	≤0.2	-	-	Rest	-
1J76	0.03	0.02	0.02	0.3-0.6	0.15-0.3	75.0-76.5	1.8-2.2	-	-	4.8-5.2	-	-	Rest	-
1J77	0.03	0.02	0.02	0.3-0.6	0.15-0.3	75.5-78	-	-	3.9-4.5	4.8-6.0	-	-	Rest	-
1J79	0.03	0.02	0.02	0.6-1.10	0.3-0.5	78.5-80.0	-	-	3.8-4.1	≤0.2	-	-	Rest	-
1J80	0.03	0.02	0.02	0.6-1.10	1.1-1.5	79.0-81.5	2.6-3.0	-	-	≤0.2	-	-	Rest	-
1J85	0.03	0.02	0.02	0.3-0.60	0.15-0.3	79.0-81.0	-	-	4.8-5.2	≤0.2	-	-	Rest	-
1J87	0.03	0.02	0.02	0.3-0.6	≤0.3	78.5-80.5	-	-	1.6-2.2	-	-	6.5-7.5	Rest	-

For more details, pls directly contact us.

4J50 soft magnetic wire is essential in devices that rely on precise magnetic response. Typical applications include:

Transformer cores — offering low energy loss and stable inductance under alternating current conditions.
Inductor cores — for high-efficiency power supplies and precision circuits.
Magnetic sensors and amplifiers — used in communication and navigation equipment.
Magnetic shielding — for sensitive electronic devices and instrumentation.
Relay cores and actuators — where stable magnetization behavior is critical.

Because of its controlled composition and soft magnetic nature, 4J50 wire is preferred in aerospace, communication, and instrument manufacturing industries.

The demand for high-stability magnetic alloys like 4J50 has grown significantly due to the rapid development of precision electronics, renewable energy systems, and miniaturized power devices. As industries shift toward higher efficiency and reduced energy loss, the focus is increasingly on advanced materials that provide magnetic uniformity and low heat generation.

In recent years, manufacturers have been optimizing alloy purity and refining processing methods to improve permeability and reduce magnetic aging. DLX Alloy’s process upgrades — including vacuum melting and precision heat treatment — align with this global trend, ensuring our 4J50 wire delivers consistent magnetic performance and long service life.

With the push for lighter and more compact transformers in EVs, renewable energy systems, and data centers, soft magnetic alloys like 4J50 are expected to play an even larger role in the next decade.

Property	4J50 Alloy Wire	4J42 Alloy Wire	1J79 Alloy Wire
Nickel Content (%)	49–51	41–43	78–80
Magnetic Permeability (μ)	High	Moderate	Very High
Coercive Force (A/m)	≤ 50	≤ 60	≤ 40
Resistivity (μΩ·cm)	40–50	45–50	60–70
Curie Temperature (°C)	~500	~360	~450
Density (g/cm³)	8.2	8.1	8.7
Heat Resistance	Good	Moderate	Good
Typical Use	Transformer, Inductor	Sealing Alloy	Magnetic Shielding

From this comparison, 4J50 offers a well-balanced magnetic performance suitable for applications requiring both stability and moderate permeability. It’s less costly than high-nickel alloys like 1J79 while offering better thermal stability than 4J42.

Why DLX Alloy?

DLX Alloy has built a strong reputation for producing high-quality magnetic and resistance alloys. Our 4J50 wire stands out because we control every step — from smelting to final inspection — to ensure precise chemical composition and magnetic consistency.

Key advantages include:

Vacuum melting & precision annealing: guarantees uniform grain structure and eliminates impurities that affect magnetism.
Tight dimensional control: wire diameters are maintained within ±0.005mm tolerance.
High-purity raw materials: ensure repeatable magnetic behavior across batches.
Customized magnetic performance: tailored heat treatments and wire sizes to match customer requirements.
Global supply reliability: serving clients across electronics, energy, and aerospace sectors.

In today’s competitive alloy industry, many suppliers focus on volume, but at DLX Alloy, our focus is precision and reliability. Our 4J50 wire not only meets international standards but often exceeds them in terms of uniformity and stability.

DLX Production and Quality

We utilize advanced equipment, including vacuum induction furnaces, intermediate frequency melting systems, and fully automated wire drawing lines. Every batch of wire undergoes strict testing for coercivity, permeability, resistivity, and mechanical integrity.

Our QC team uses instruments like magnetic permeability testers, metallographic analyzers, and microhardness testers to ensure consistent performance. All test data are traceable, ensuring transparency and confidence for our clients.

DLX also provides flexibility in product customization — wire diameters, insulation coatings, and spooling formats can be adapted to specific application needs.

As electronic components evolve toward higher frequency and lower power loss, materials like 4J50 play an essential role in reducing energy consumption. Soft magnetic alloys contribute to sustainability by improving device efficiency and minimizing waste heat.

DLX is committed to environmentally friendly production, using recyclable packaging and low-emission manufacturing methods. We believe that material innovation and responsible production go hand-in-hand in shaping the next generation of high-performance alloys.

4J50 soft magnetic alloy wire remains one of the most versatile and stable materials for magnetic core applications. Its balanced composition, consistent permeability, and temperature resilience make it a go-to choice for modern transformers, inductors, and magnetic shielding components.

DLX Alloy continues to refine our production technology to meet evolving industrial demands — combining metallurgical precision, quality control, and customer-focused flexibility to deliver materials that empower the future of electronics and energy systems.

About Us:

Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications.

For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.