一种耐超低温球墨铸铁及其生产工艺
By combining nano-oxide particles with a three-stage inoculation process, the problems of slow solidification rate and high cost of high nickel in traditional low-temperature ductile iron with thick cross sections have been solved. This has achieved high strength and high toughness at ultra-low temperatures, expanded the application range and reduced production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANDONG YUANTONG MASCH CO LTD
- Filing Date
- 2026-05-12
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional low-temperature ductile iron solidifies slowly in thick and large cross-section conditions, leading to coarsening of graphite nodules and uncontrolled grain size. It also relies on high nickel content, resulting in high costs and making it difficult to maintain high strength and impact toughness in ultra-low temperature environments.
A synergistic mechanism of nano-oxide dispersion strengthening and graphite sphere heterogeneous nucleation refinement is introduced. By mixing nano-titanium oxide, magnesium oxide and cerium oxide particles with reduced iron powder after high-energy ball milling, composite reinforcing particles are formed. Combined with a three-stage inoculation process and a two-stage annealing process, the solidification structure and heat treatment process are optimized.
By reducing the amount of alloying elements, the strength and impact toughness of the material are improved simultaneously in ultra-low temperature environments, reducing production costs and improving the uniformity of mechanical properties of thick and large cross-section castings, making it suitable for applications in extreme low temperature environments.
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