一种用于铁模覆砂模具的蠕墨铸铁材料及其加工方法

By using vermicular graphite cast iron material and specific alloying elements, and optimizing graphite morphology and nitrogen absorption, the thermal fatigue and stability problems of iron molds coated with sand under high temperature environments were solved, achieving long mold life and stable casting precision.

CN121951359BActive Publication Date: 2026-07-17SHANDONG XUGUANG DERUI NEW MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG XUGUANG DERUI NEW MATERIAL CO LTD
Filing Date
2026-03-26
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing iron mold sand coating mold materials have insufficient thermal fatigue performance and stability under high temperature environments, resulting in short mold service life, frequent replacement, and affecting the accuracy and stability of castings.

Method used

Vermicular graphite cast iron material with 60-80% vermicular graphite and 20-40% spheroidal graphite is used, combined with a low-carbon, high-silicon ferrite matrix, and Bi, Mo, V, and Cr multi-element alloys are added. Through negative pressure melting and high pressure vermicularization treatment, the graphite morphology and nitrogen absorption are optimized to form a structure with high thermal conductivity and low stress concentration.

Benefits of technology

It significantly improves the thermal fatigue resistance and high-temperature stability of iron molds coated with sand, extends mold life, reduces replacement frequency, and ensures stable casting accuracy.

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Abstract

本申请提供了一种用于铁模覆砂模具的蠕墨铸铁材料及其加工方法，涉及铸铁件技术领域。蠕墨铸铁材料包括以下成分：C：2.2%‑2.8%，Si：4.5%‑5.0%，Mn：≤0.5%，P：≤0.05%，S：≤0.015%，Mo：0.3%‑0.5%，V：0.3%‑0.5%，Cr：0.2%‑0.4%，Bi：0.01%‑0.03%，N：80‑120ppm，余量为铁和不可避免杂质。本申请蠕墨铸铁材料中60‑80%蠕虫状石墨的铸铁，其余为球状石墨，几乎不存在片状石墨，具有良好的热疲劳抗性和高温稳定性。
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