High-performance as-cast ductile iron and its application
CN122235573APending Publication Date: 2026-06-19HUBEI TAIKE FRICTION MATERIAL CO LTD
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUBEI TAIKE FRICTION MATERIAL CO LTD
- Filing Date
- 2026-05-25
- Publication Date
- 2026-06-19
AI Technical Summary
Technical Problem
[0003]然而，现有铸态珠光体球墨铸铁仅依靠单一元素掺杂促进铸态珠光体生成，仅能实现“部分珠光体析出”，凝固过程中铁素体极易随机析出，导致珠光体占比浮动范围极大，无法精准稳定控制基体组织
Benefits of technology
[0018]本发明的有益效果是：本发明通过对球墨铸铁的各化学元素成分限定，同时限定碳硅比、碳锰当量比、Mn:Cu:(Sb/Sn)三组核心配比，不仅显著降低铁液熔融粘度，提升铁液流动性，便于实现薄厚壁复杂结构铸件的浇注成型，保障铸件无冷隔、浇不足、显微疏松、白口等铸造缺陷；而且通过成分设计精准调控基体组织，有效细化石墨、净化晶界，稳定获得80%-90%均匀珠光体基体，无需严苛依赖铸造工艺参数、无需后续热处理，简化生产流程、降低生产能耗与成本。本发明获得的球墨铸铁铸件抗拉强度≥720MPa，球化等级为1-2级，石墨大小级别为6-7级，渗碳体数量不高于2%。
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Abstract
This invention relates to the field of casting technology, and more particularly to a high-performance as-cast ductile iron with the following chemical composition: C: 3.3%-3.9%, Si: 2.25%-2.8%, Mn: 0.2%-0.55%, P: ≤0.05%, S: ≤0.03%, Cu: 0.3%-0.8%, Mg: 0.035%-0.06%, Sb and / or Sn: 0.03%-0.15%, RE: 0.01%-0.03%, with the remainder being Fe and unavoidable impurities, wherein C+1 / 3Si:Mn=10-18, C / Si=1.4-1.6, Mn:Cu:(Sb or / and Sn)=1:(1.33-2.33):(0.10-0.40). This invention, by limiting the carbon-silicon ratio, C+1 / 3Si:Mn, and Mn:Cu:(Sb or / and Sn) three core proportions, not only significantly reduces the molten viscosity of molten iron and improves its fluidity, but also helps to ensure the mechanical strength, wear resistance and other properties of the castings, ensure the forming quality of the castings, facilitate the casting and forming of complex structures with thin and thick walls, and ensure the quality of ductile iron castings.
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