One. Technical Positioning: Precision Manufacturer of Iron-Nickel Positive Expansion Alloys

Qinchuan New Materials (Zhengzhou) Co., Ltd. is located in the Zhengzhou High-Tech Industrial Development Zone, leveraging the regional scientific research resources and industrial cluster advantages to focus on the research and manufacturing of high-purity metals, special alloys, and related products. The company takes iron-nickel precision expansion alloys as its core product line, achieving precise control of alloy composition and uniformity optimization of microstructure through advanced processes such as vacuum induction melting (VIM) and electroslag remelting (ESR), providing high-performance material solutions for aerospace, electronic packaging, energy power, and other fields.

Chapter II: Technical Layout: Full-process control from material research and development to precision manufacturing
1. Innovation in Smelting Technology
Qinchuan utilizes the VIM+ESR/VAR combined refining technology, controlling gas and inclusion content through multi-stage vacuum environments to ensure the purity of the master alloy. For example, in the production of K418 nickel-based precipitation strengthening casting high-temperature alloys, this process significantly increases the content of the γ' strengthening phase (Ni₃(Al,Ti)) in the alloy, achieving industry-leading tensile strength at 900°C. Meanwhile, near-net-shaped complex internal cavity cooling channels are realized through directional solidification technology, meeting the dual requirements of material properties and structural accuracy for aeroengine turbine blades.
2. Heat Treatment System Optimization
In response to the requirement for tissue stability of iron-nickel constant-expansion alloys, Qinchuan has developed an accurate heat treatment process of solid solution + aging. Taking 4J44 iron-nickel constant-expansion alloy as an example, residual stress is eliminated through high-temperature solid solution treatment at 900-950°C, combined with pre-oxidation treatment under wet hydrogen or vacuum conditions, forming a 3-7μm deep blue-gray oxide film on the alloy surface to ensure airtightness and reliability during sealing with soft glass. This process maintains the expansion coefficient of 4J44 at 11.2×10⁻⁶/℃ within the temperature range of -60°C to 400°C, suitable for high-precision applications such as special light source electrode lead-in lines.
3. Precision machining capabilities
The company is equipped with high-precision cold rolling and cold drawing equipment, as well as hydrogen/vacuum annealing furnaces, enabling precise control of cold working deformation in alloy strip materials. For example, the 4J42 alloy, at a cold strain rate of 60%, undergoes intermediate annealing at 950-1050℃ to restore the austenitic structure, avoiding grain growth that leads to reduced plasticity, ensuring the vacuum tightness of thin-section materials, and meeting the processing requirements for components such as electron tube shell flanges.

Section 3: Industry Applications: Deep Integration of Technical Parameters and Scenario Adaptation
1. Aerospace field
Qingchuan's K418/K419 cast high-temperature alloy has replaced imported materials and is applied to the turbine working blades and guide vanes of aeroengine. Its performance parameters are as follows:
- Operating Temperature: 900-1000℃
- Persistent strength: ≥350MPa (100h/900℃)
- Creep resistance: ≤1×10⁻⁵%/h (900℃/200MPa)
The single crystal blade structure achieved through directional solidification technology improves engine thermal efficiency by 15%, increases thrust-to-weight ratio by 10%, and significantly reduces fuel consumption.
2. Electronic Packaging Field
4J44 iron-nickel constant-expansion alloy, with an expansion coefficient matching soft glass (11.2×10⁻⁶/℃), is the preferred material for X-ray tube and microwave tube input windows. Application cases include:
- Medical X-ray tube model: Sealed with 4J44 and tungsten glass, achieving an airtightness grade of 1×10⁻¹¹Pa·m³/s for the tube flange, meeting stringent requirements for radiation leakage in medical equipment.
- 5G communication base station microwave tube: Surface oxide film treated with 4J44 pre-oxidation, resulting in a 30% increase in bonding strength with soft glass, ensuring stability in high-frequency signal transmission.
3. Energy and Power Field
In the manufacturing of heavy-duty gas turbine blades, Qingchuan has developed an integrated solution of heat-resistant corrosion coating + matrix material. For instance, the second-stage stationary blade of a certain type of gas turbine uses a K418 alloy matrix, which, after being coated with an MCrAlY layer, extends its lifespan to 8,000 hours in a 950℃ high-temperature sulfur environment, a 3-fold increase compared to uncoated components.

Four, Technical Advantages: Closed-loop Verification from Laboratory to Industrialization
Qingchuan New Materials demonstrates its technical strength in the full chain capability of "materials-technology-solutions".
- R&D endCollaborating with institutions such as Zhengzhou University and the Institute of Process Engineering, Chinese Academy of Sciences, we have established an industry-academia-research collaborative innovation platform, with a total of 11 patent applications and participation in the formulation of 3 industry standards.
- Production endThrough ISO9001:2015 quality system certification and the integration of industrialization and informatization management system certification, equipped with spectrometer analyzers, metallographic microscopes and other testing equipment, we achieve full-process quality traceability from raw material entry to finished product delivery.
- Server-sideProvide "turnkey" precision casting delivery service; customers only need to provide 3D models, and Qinchuan can complete the full process manufacturing from mold design, shell making, casting to post-processing, shortening the R&D cycle by over 40%.

Conclusion
Qingchuan New Materials (Zhengzhou) Co., Ltd. has established differentiated competitiveness in the field of iron-nickel permanent expansion precision alloys through continuous technological iteration and in-depth scenario exploration. Its technical practice shows that the performance breakthrough of special alloy materials not only depends on component design but also requires collaborative optimization through processes such as melting, heat treatment, and precision processing to realize the value transformation from laboratory data to industrial-grade products. In the future, with the further enhancement of material performance requirements in fields such as aerospace and new energy, Qingchuan's technical route will provide a more reliable underlying support for high-end equipment manufacturing.