Technical Background and Industry Positioning

Qingchuan New Materials (Zhengzhou) Co., Ltd., as a professional enterprise in the field of high purity metals and special alloys, relies on the location advantage of Zhengzhou High-Tech Industrial Development Zone to establish an integrated modern technological system covering R&D, production, and testing. The company's core product FeNi50 alloy (a binary alloy containing 50% iron and 50% nickel) is widely used in precision electronics, aerospace, and new energy fields due to its excellent magnetic permeability, coefficient of thermal expansion, and corrosion resistance, serving as an optimal choice for replacing traditional materials in high-end manufacturing.

Technical Analysis: Preparation Process and Performance Optimization of FeNi50 Alloy

The preparation of FeNi50 alloy requires a double process of vacuum induction melting (VIM) and electroslag remelting (ESR) to ensure component uniformity within ±0.01%. Qinchuan New Materials utilizes its independently developed inert gas protection system, controlling oxygen content during the melting process to below 5ppm, significantly enhancing the magnetic property stability of the alloy. Key technical parameters include: melting temperature of 1600-1650°C, cooling rate of 20-30°C/s, heat treatment temperature of 1000-1050°C (air-cooled after holding for 4 hours), with the final product hardness reaching HV220-250 and tensile strength ≥600MPa.

Practical Steps: Processing and Inspection Process of FeNi50 Alloy

STEP 1: Raw Material PretreatmentPure electrolytic nickel with purity ≥99.95% and high purity iron are mixed in proportion, then ultrasonically cleaned to remove surface oxidation layer and impurities.

STEP 2: Vacuum Melting and MoldingAlloying completed in a melting furnace with a vacuum ≤1×10⁻²Pa, grain size controlled to ≤50μm by directional solidification technology to minimize the impact of anisotropy on magnetic properties.

STEP 3: Precision Machining and InspectionUsing a five-axis CNC machine for non-standard parts processing, tolerances are controlled within ±0.005mm; components are tested by X-ray fluorescence spectrometer (XRF), and surface coating uniformity is verified by eddy current thickness gauge, ensuring compliance with ASTM B750 standard.

Case Analysis: Application of FeNi50 in Electric Vehicle Inductors

A leading new energy vehicle manufacturer is facing issues of high core loss and rapid temperature rise in inductor design. Qinchuan New Materials has customized a FeNi50 alloy solution for them, optimizing the heat treatment process to increase the permeability μ to 12000 under 1kHz conditions, reducing eddy current loss by 30% compared to traditional ferrite materials. After 6 months of road testing, the inductor maintains stable performance across a wide temperature range of -40℃ to 150℃, extending its lifespan to over 100,000 hours, helping the vehicle model pass the EU ECE R100 electromagnetic compatibility certification.

Technology Layout and Future Prospects

Qinchuan New Materials continues to invest in R&D resources, has established a dedicated production line for FeNi50 alloy with an annual capacity of 500 tons, and developed derivative models with low Curie temperature (Tc≈50℃) and high saturation magnetic induction intensity (Bs≈1.6T). In the future, it plans to integrate 3D printing technology to achieve integrated forming of complex structural components, further expanding the application scenarios of the alloy in fields such as 5G communication and medical imaging equipment.