I. Technical Background and Industry Positioning

Iron-nickel fixed-expansion precision alloys, as a type of functional materials with specific thermal expansion coefficients, are widely used in electronic packaging, precision instruments, aerospace and other fields. Their core value lies in achieving low expansion characteristics within a specific temperature range by precisely controlling the composition and process of the alloys, meeting the stringent requirements of high-end equipment for dimensional stability. Qinchuan New Materials (Zhengzhou) Co., Ltd., as a professional enterprise engaged in the research, development, and manufacturing of high-purity metals and special alloys, leverages the regional advantages of the Zhengzhou High-Tech Industrial Development Zone to establish a full-process technical system covering material design, melting, shaping, and testing, becoming a technical practitioner in the field of iron-nickel fixed-expansion alloys.

Chapter II: Core Technology Layout and Process Advantages

1. Material composition design and optimization
Qinchuan New Materials has developed typical brands such as Niromei42 (4J42) through the establishment of a thermodynamic calculation model and experimental verification system, precisely controlling the proportions of elements such as iron, nickel, and cobalt. Taking Niromei42 as an example, the nickel content is controlled at 39.5%-40.5%, with iron content making up the remainder. By adding trace amounts of molybdenum, titanium, and other elements, it achieves a linear expansion coefficient ≤1.5×10⁻⁶/℃ within the temperature range of -60℃ to 200℃, meeting the thermal matching requirements for electronic component sealing. This alloy has a yield strength ≥345MPa and elongation ≥22%, combining mechanical and processing properties.

2. Melting and molding process control
The company employs a dual process of Vacuum Induction Melting (VIM) + Electroslag Remelting (ESR), effectively reducing the gas content in the alloy (oxygen ≤ 15ppm, nitrogen ≤ 10ppm) and non-metallic inclusion level (Class A inclusions ≤ 1.5), enhancing the purity and uniformity of the material. For complex structural components, the precision casting technique with a mold is introduced, controlling grain orientation through directional solidification to minimize deformation caused by thermal stress, with casting size tolerance up to ±0.05mm and surface roughness Ra ≤ 1.6μm.

3. Heat Treatment and Post-Processing Technology
Through solution treatment (at 1050℃±10℃, with holding for 2 hours followed by water quenching) and aging treatment (at 480℃±5℃, with holding for 4 hours followed by air cooling), the size and distribution of the γ' phase (Ni₃(Al,Ti)) are controlled, enabling the alloy to maintain excellent creep resistance after long-term aging (creep rate ≤0.1% at 750℃/100h). Combined with hot isostatic pressing (HIP) technology to eliminate micro-porosity, further enhancing the density (≥99.9%) and fatigue life (≥1×10⁷ cycles) of the casting.

Section 3: Industry Application Cases and Effectiveness Verification

1. Aerospace field: Turbine blade manufacturing
Qinchuan New Materials provides K418 nickel-based precipitation-hardened casting superalloy to a certain aviation engine manufacturer, replacing imported materials for the production of turbine work blades. By optimizing the γ' phase content (40%-45%) and grain size (ASTM 4-6), the blade's tensile strength at 900℃ is increased by 15%, the creep resistance is improved by 20%, the cost is reduced by 30%, and the delivery cycle is shortened to 60% of the original import cycle.

2. Electronic Packaging Field: Precision Frame Production
In response to the demand for low expansion frames in 5G communication base stations, Qinchuan has developed the Niromei42 alloy frame. Through precision stamping and surface nickel plating treatment, the frame achieves thermal expansion coefficient matching with ceramic substrates (CTE difference ≤ 2×10⁻⁶/℃), improving packaging reliability by 40% and product yield from 85% to 95%.

3. Energy Power Field: Gas Turbine Components
Supplies directional solidification turbine guide vanes for a heavy-duty gas turbine manufacturer, utilizing single crystal casting technology to control grain orientation, enhancing the component's oxidation resistance at 1050℃ by 25%, extending the thermal corrosion life to 1.8 times the raw material's life, and supporting continuous operation of the unit for over 8000 hours.

4. Technical Support System and R&D Capabilities

1. Equipment and testing capabilities
The company is equipped with German-imported spectrometer, Japanese electron scanning electron microscope (SEM), and American hot isostatic pressing furnace, enabling full-dimensional detection of alloy composition, microstructure, and mechanical properties. Among them, the direct-reading spectrometer achieves a detection accuracy of ±0.01%, and the SEM resolution reaches 1nm, providing data support for process optimization.

2. Industry-academia-research cooperation mechanism
Established joint laboratories with the Institute of Process Engineering, Chinese Academy of Sciences and the School of Materials, Zhengzhou University, to carry out projects such as "Key Technology Research on High-Temperature Alloy Powder Preparation", with a total of over 50 patent applications (including 1 international patent), participated in formulating 3 industry standards, and undertook 2 provincial or above scientific research projects.

3. Customized service capability
Based on the "Material + Technology + Solution" model, we offer a full-process service from 3D modeling, mold design to post-processing. For example, for a certain car company, we developed a turbocharger impeller by simulating and optimizing the channel structure, which increased the impeller efficiency by 8%, reduced the noise by 3dB, and met the requirements of the national VI emission standards.

V. Technological Outlook and Industry Value

The technical development of iron-nickel precision alloys with fixed expansion is evolving towards higher accuracy, lower costs, and broader application scenarios. Qinchuan New Materials, through continuous investment in R&D resources, optimization of composition design, melting process, and post-treatment technology, has formed a complete solution covering fields such as aerospace, electronic packaging, and energy power. In the future, the company will continue to deepen cooperation with the upstream and downstream of the industrial chain, promote collaborative innovation in material properties and manufacturing processes, provide technical support for the domestic substitution of high-end equipment, and help transform China Manufacturing into China "Intelligent Manufacturing".