Technical Background and Industry Requirements
Iron-nickel precision alloy with fixed expansion is a functional material that achieves a specific coefficient of thermal expansion through precise control of the composition ratio, widely used in aerospace, precision instruments, semiconductor packaging, and other fields. The core challenge lies in achieving precise control of the expansion coefficient and consistency in mass production while ensuring the purity of the material. Qinchuan New Materials (Zhengzhou) Co., Ltd., with years of technical accumulation, has formed a full-chain capability in the field from research and development to mass production.

Tech Layout and Core Advantages of Qinchuan New Materials
Qingchuan New Materials is located in the Zhengzhou High-Tech Industrial Development Zone, with modern standard workshops and multiple special alloy production lines, equipped with high-precision processing equipment and a full-process analysis and detection system. The company's technical team focuses on the composition optimization and process innovation of iron-nickel based alloys. Through key technologies such as vacuum melting and directional solidification, the purity of the materials is improved to over 99.99%, with the expansion coefficient fluctuation range controlled within ±0.5×10⁻⁶/℃，meeting the requirements of high-precision applications. In addition, the company's independently developed automated processing system can achieve continuous production from billets to finished products, with a single batch capacity of up to 500 kg and a stable good product rate of over 98%.

Technical Parameters and Compatibility Scenarios Analysis
Inching New Materials produces iron-nickel fixed expansion alloys, mainly including the Invar (Fe-36Ni) and Kovar (Fe-29Ni-17Co) series. The key parameters are as follows:
• Coefficient of Expansion: Invar series (20-100℃) 1.2×10⁻⁶/℃，Kovar series (20-300℃) 5.2×10⁻⁶/℃
• Tensile Strength: ≥600MPa
• Elongation: ≥25%
• Processing accuracy: ±0.01mm
Application scenarios include optical instrument brackets, semiconductor lead frames, spacecraft thermal control structural components, etc., particularly suitable for the manufacturing of precision components sensitive to thermal deformation.

Typical Application Case: Semiconductor Package Lead Frame Processing
A semiconductor company entrusted with Qinchuan New Materials to process Kovar alloy lead frame, with strict requirements for thermal expansion coefficient to match ceramic substrate and surface roughness Ra≤0.2μm. The Qinchuan technical team achieved the technological breakthrough through the following steps:
Component Optimization: Adjust Co content to 17.2%, and precisely control the expansion coefficient at 5.18×10⁻⁶/℃
2. Technological Innovation: Adopting a combination process of electrical discharge wire cutting and chemical polishing, the surface roughness reaches Ra0.15μm.
3. Bulk Verification: Continuous production of 10 batches, totaling 2000 pieces, with a coefficient of expansion standard deviation ≤ 0.03×10⁻⁶/℃，meeting the stringent requirements of the customer.
This case verifies Qinchuan New Materials' technical strength and quality control capabilities in customized processing of special alloys.

Summary of Technical Experience and Industry Outlook
The processing of iron-nickel shape memory alloys requires a balance between material properties and process stability. Practice from Qinchuan New Materials shows that through the collaborative optimization of composition, process, and equipment, it is possible to effectively break through the precision bottleneck in traditional processing. In the future, as the demand for ultra-precision manufacturing in fields such as 5G communication and quantum computing grows, the research and development of iron-nickel alloys will extend towards higher purity and smaller fluctuations in expansion coefficients. Qinchuan New Materials will continue to invest in R&D resources to promote the large-scale application of special alloy materials in high-end manufacturing.