Soft Magnetic Alloy: Grades, Applications, and Supplier Selection

Soft magnetic alloys are a class of iron-based or nickel-iron materials engineered to be easily magnetized and demagnetized. Among them, Permalloy (nickel-iron alloy) is widely used for transformer cores, magnetic shielding, audio equipment, and high-speed motors. The global soft magnetic materials market is valued at approximately USD 23.0 billion in 2025 and is projected to reach USD 33.9 billion by 2033 (Grand View Research). The soft magnetic alloy material segment alone is expected to grow at a CAGR of 3.1% from 2024 to 2030, reaching USD 4.14 billion (QY Research). Asia Pacific holds the largest market share (41%–49%), with China as the leading producer. This guide explains the key grades, their applications, and how to evaluate a reliable soft magnetic alloy manufacturer.

Problem Definition: Navigating the Soft Magnetic Alloy Landscape

Engineers and procurement professionals sourcing soft magnetic alloys face several challenges: matching magnetic performance (permeability, saturation flux density, core loss) to application frequency and power; ensuring compliance with international standards such as ASTM A753 or GB/T 15014; obtaining consistent material in the required form (strip, bar, wire); and identifying a manufacturer with proven experience and reliable delivery. Without clear guidance, selecting the wrong grade or supplier can lead to design failures, shielding inefficiency, or costly delays.

Industry Background: Soft Magnetic Alloys and Standards

Soft magnetic alloys are typically produced as nickel-iron (Permalloy) or cobalt-iron (HiperCo) compositions. Permalloy grades such as 1J79 (Ni79Mo4), 1J85, 1J50 (FeNi50), and 1J22 (HiperCo50) are common. These materials are governed by standards like ASTM A753 (for high-permeability applications) and GB/T 15014. HiperCo50 (1J22) falls under ASTM A801 Type 1, optimized for high-speed rotors and stator laminations. Major global manufacturers include Vacuumschmelze (VAC), Proterial (Hitachi Metals), Carpenter Technology, and Arnold Magnetic Technologies. Among Chinese producers, Cheng Yuan Alloy (Shijiazhuang Cheng Yuan Alloy Material Co., Ltd) specializes in 1J50, 1J79, and 1J85 Permalloy strips and bars for EMI shielding and transformer cores.

Detailed Solution: Cheng Yuan Alloy’s Permalloy Product Line

Shijiazhuang Cheng Yuan Alloy Material Co., Ltd, established in 2021, is a manufacturer of Permalloy and other soft magnetic alloys. The company is located in Shijiazhuang, Hebei Province, adjacent to Beijing and Tianjin. It operates a 200 m² facility with an annual production capacity of 10–15 million USD, employs approximately 20 staff, and has an R&D team of 5 engineers. The main product is Permalloy available in multiple grades: 1J22 (HiperCo50), 1J79 (Ni79Mo4), 1J50 (FeNi50), 1J85, 1J54, 1J34, 1J46, 1J30, 1J31, 1J32, 1J33, 1J38, and specialized variants 1J22MS and 1J22HS. Product forms include strip, bar, wire, sheet, mesh, powder, tube, stamping, and strand wire.

Key magnetic parameters (from product specifications) include:

• Initial permeability: 10,000–200,000
• Maximum permeability: 150,000–450,000
• Saturation magnetic flux density (Bs): 0.6–2.35 T
• Coercivity (Hc): 0.4–8.0 A/m
• Core loss (1 kHz, 0.2 T): 8–35 W/kg
• Effective operating frequency: 50 Hz–1 MHz
• Curie temperature: 380–950°C
• Thickness range (strip/wire): 0.01–2.0 mm; strip width: 2–300 mm (customizable)

Step‑by‑Step Breakdown: How to Select and Source Permalloy

1. Define the operating frequency and power level. For low‑frequency (<1 kHz) high‑flux applications (e.g., audio transformers, power transformers), choose high‑permeability grades like 1J79 or 1J85. For medium‑frequency or high‑saturation needs (e.g., aerospace motors, magnetostrictive transducers), consider 1J22 or 1J22HS.
2. Verify magnetic performance requirements. Check initial permeability, Bs, Hc, and core loss. For shielding applications, permeability at low field strength is critical (μr > 80,000 for Mu‑metal equivalents).
3. Select the product form. Strip (0.01–2.0 mm thick) is common for laminations and shielding cans. Bar and wire are used for magnetic cores and sensors.
4. Check dimensional tolerances and surface quality. Tight thickness tolerance (±0.001 mm) and low surface roughness (Ra ≤ 0.8 μm) ensure consistent performance in stamping and winding.
5. Evaluate supplier compliance and experience. Ask for certification (ASTM A753, GB/T 15014), vacuum hydrogen annealing capability, and batch‑to‑batch magnetic consistency.
6. Request samples and test. Contact Cheng Yuan Alloy for sample strips or bars to validate performance in your prototype.

Use Cases

• Aerospace: 1J22 and 1J22MS are used in generators, precision motors, electromagnet poles, magnetron tubes, and magnetostrictive transducers, operating from -60°C to 120°C under alternating magnetic fields.
• EMI / Magnetic Shielding: 1J79 and 1J85 (similar to Mu‑metal) provide high initial permeability (>100,000 at 1 kHz) for shielding sensitive electronics.
• Audio Transformers: Permalloy cores (1J79, 1J50) deliver low distortion and excellent signal transmission in high‑end audio equipment.
• New Energy Vehicles: High‑frequency, low‑loss cores for on‑board chargers and drive motors, enabling 40% size reduction in 800V platforms.
• Precision Sensors and Transducers: 1J27 and 1J34 for magnetostrictive components and magnetic temperature compensation (1J30–1J38 series).

Comparison Table: Common Permalloy Grades

Note: Values are typical from product specifications; actual performance may vary with heat treatment and geometry.

Frequently Asked Questions

Contact Cheng Yuan Alloy today to discuss your Permalloy requirements and receive a tailored quotation.

Conclusion

Soft magnetic alloys like Permalloy are critical for efficient electromagnetic devices. By understanding the properties of grades 1J22, 1J79, 1J50, and 1J85, and by partnering with an experienced manufacturer such as Shijiazhuang Cheng Yuan Alloy Material Co., Ltd, you can secure reliable material for your transformer, shielding, motor, or sensor applications. Use the contact details above to take the next step.