Product Introduction to Zhenjiang Dongfeng Special Alloy Spheroidizing Agent
Release time:
2026-04-29
Zhenjiang Dongfeng Special Alloy Co., Ltd. was established in 1995 as a specialized manufacturer of special alloys, jointly funded by Toyo Electrochemical Industry Co., Ltd. of Japan (holding a 90% stake) and Aisin Takahashi Co., Ltd. (holding a 10% stake). Leveraging the advanced production technologies and management expertise of its Japanese parent company, the firm has been dedicated to the R&D and production of RE-Mg nodulizers for more than three decades, with an annual capacity of 25,000 metric tons. It is a core supplier in China’s high-quality ductile iron casting industry.
I. Product Overview
Zhenjiang Dongfeng Special Alloy Co., Ltd. was established in 1995 as a specialized manufacturer of special alloys, jointly funded by Toyo Electrochemical Industry Co., Ltd. of Japan (holding a 90% stake) and Aisin Takahashi Co., Ltd. (holding a 10% stake). Leveraging the advanced production technologies and management expertise of its Japanese headquarters, the company has been dedicated to the R&D and production of RE-Mg nodulizers for more than three decades, with an annual capacity of 25,000 metric tons. It is a core supplier in China’s high-quality ductile iron casting industry.
Dongfeng RE-Mg spheroidizing agent is a high-efficiency alloy additive specially formulated for ductile iron production. Its core components are magnesium, rare earth elements, silicon, and iron, complemented by precisely proportioned additions of calcium, barium, and other elements. This formulation promotes the transformation of graphite in cast iron from flake to spheroidal form, significantly enhancing the strength, toughness, and wear resistance of castings. It is widely suitable for high-end casting applications in industries such as automotive, construction machinery, wind power, and precision machinery.
II. Core Ingredients and Product Line
(1) Core Ingredients (Typical Ratio)
Composition: Mg (magnesium), RE (rare earth elements), Si (silicon), Ca (calcium), Ba (barium), Fe (iron), and impurities (such as MgO).
Composition ranges: Mg (4.0%–8.0%), RE (1.0%–3.0%), Si (40%–48%), Ca (0.5%–2.0%), Ba (0.3%–1.5%), Fe (remainder), impurities (≤0.5%).
(2) Product Series
1. Standard RE-Mg Nodulizer
Applications: Conventional ductile iron castings (e.g., general machinery, pipelines, and valves); compatible with cupola and electric furnace melting; stable spheroidization reaction; high cost-effectiveness.
2. High-efficiency, low-slag spheroidizing agent
Features: Magnesium oxide content ≤0.2%; slag formation is only 1/8 of that of conventional products; high magnesium absorption rate (≥75%).
Applications: thin-walled precision castings and castings with high purity requirements (e.g., automotive components, air-conditioner compressors).
3. Heavy Rare-Earth Anti-Decline Nodulizer
Features: The addition of yttrium-based heavy rare earth elements enhances resistance to spheroidization degradation and significantly improves resistance to interfering elements.
Applicable to: thick-section castings, long-duration pouring castings, and molten iron containing interfering elements such as titanium and antimony.
4. Customized Spheroidizing Agent
Services: We can customize the composition and particle size (available in 5–30 mm) based on the customer’s molten iron chemistry, casting specifications, and process requirements.
III. Core Product Advantages
(1) Technological and Process Advantages
- Japanese technology control: Adopts Toyo Denka’s core processes, with resident guidance from Japanese casting experts, ensuring technology is aligned with the international cutting edge.
- Precise production control: medium-frequency furnace melting combined with a computerized automatic batching system, with compositional deviation controlled within ±0.2%.
- Comprehensive precision testing: Japan’s Shimadzu X-ray fluorescence analysis system for end-to-end quality monitoring.
- High-purity material assurance: Selected high-quality furnace charge, resulting in high alloy purity and minimal oxide inclusions and slag.
(2) Performance and Application Advantages
1. Excellent spheroidization: Graphite spheroidization rate ≥ 90%, with fine and uniform graphite nodules (grade 6–8), resulting in tensile strength of castings ranging from 400 to 900 MPa.
2. Stable and safe reaction: The reaction is mild with no violent boiling, minimal magnesium loss, and no significant smoke or dust generation, making it suitable for various processes such as the冲熔method and in-mold spheroidization.
3. Strong anti-interference capability: The rare-earth composition effectively counteracts the adverse effects of anti-spheroidizing elements such as titanium, lead, and arsenic, making it suitable for molten iron with complex chemical compositions.
4. Lower overall cost: high absorption rate, reduced dosage, and minimal slag generation, which minimizes post-processing steps and improves the yield of finished castings.
IV. Mechanism of Action
1. Desulfurization and deoxidation: Mg and RE elements preferentially react with S and O to form high-melting-point compounds (MgS and RE₂O₃), which float to the slag for removal, thereby purifying the molten iron.
2. Modify the graphite morphology: inhibit flake-like graphite growth, promote spheroidal crystallization, and eliminate the embrittlement of the matrix caused by flake graphite.
3. Grain refinement: Formation of heterogeneous nucleation cores, resulting in finer grains and improved mechanical and machinability properties of the casting.
V. Application Areas
- Automotive industry: high-strength, precision castings such as engine blocks, crankshafts, transmission housings, and wheel hubs.
- Construction machinery: excavator parts, hydraulic components, gearboxes, and track pads.
- Wind power energy: large thick-walled castings such as wind turbine hubs, bases, and gearboxes.
- General machinery: machine tool beds, compressor casings, pumps and valves, and rail transit components.
VI. Quality and Service Assurance
- System certifications: Certified to ISO 9001 for quality management, ISO 14001 for environmental management, and ISO 45001 for occupational health and safety.
- Reliable supply: annual production capacity of 25,000 tons, standardized manufacturing processes, and timely delivery.
- Technical Support: A dedicated team provides technical services such as molten iron composition analysis, process optimization, and on-site commissioning.
- Packaging, Storage, and Transportation: Packaged in 25 kg plastic-lined woven bags or ton bags; moisture- and oxidation-resistant; suitable for land and sea transportation.
VII. Conclusion
Zhenjiang Dongfeng Special Alloys centers on Japanese-quality standards, localized service, and unwavering reliability, having cultivated the nodulizing agent sector for more than three decades. Its products have long served China’s high-end foundries, helping to enhance the quality and competitiveness of ductile iron castings.
We remain committed to putting customer needs at the core, continuously optimizing product performance and enhancing technical services, with the goal of becoming your preferred alloy partner for ductile iron production!
Zhenjiang Dongfeng Special Alloy Co., Ltd.
- Address: Xinning Village, Xinba Town, Yangzhong City, Jiangsu Province
- Telephone: 0511-88130800
- Email: sales@zdsa.com
- Official website: www.zdsa.com
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