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发明公开
CN108396219A 一种曲轴用铸态高强度球墨铸铁及其制备方法 有权

一种曲轴用铸态高强度球墨铸铁及其制备方法
摘要：
一种曲轴用铸态高强度球墨铸铁及其制备方法，按重量百分比计的以下元素组成：4.2≤CE≤4.5，C：3.5-3.9%，Si：1.8-2.2%，Mn：≤0.5%，P：≤0.03%，S：0.005-0.02%，Cu：0.4-0.8%，Sb：0.002-0.01%，余量为Fe以及不可避免的微量元素。本发明公开的球墨铸铁材料，抗拉强度为800-850Mpa，延伸率为≥6%，球化率为90%。金相组织：基体为珠光体，珠光体≥90%，渗碳体+磷共晶≤2%，球化率2级以上、石墨球大小5-8级；抗拉强度Rm≥800MPa，伸长率≥6%。采用本发明制备方法生产的曲轴等关键零部件，质量可靠，性能优越。
摘要（英）：

The invention provides as-cast high-strength nodular cast iron for a crankshaft and a preparation method of the as-cast high-strength nodular cast iron. The as-cast high-strength nodular cast iron consists of the following elements by weight percent: more than or equal to 4.2 and less than or equal to 4.5 of CE, 3.5-3.9% of C, 1.8-2.2% of Si, less than or equal to 0.5% of Mn, less than or equal to0.03% of P, 0.005-0.02% of S, 0.4-0.8% of Cu, 0.002-0.01% of Sb and the balance of Fe and inevitable micro-elements. The as-cast high-strength nodular cast iron has the tensile strength of 800-850 Mpa, the ductility of more than or equal to 6% and the nodularity of 90%. A metallographic structure has the matrix of more than or equal to 90% of pearlite. Cementite and iron phosphide eutectic are less than or equal to 2%. The nodularity is 2-level or above. The sizes of graphite nodules are 5-8 levels. The tensile strength Rm is more than or equal to 800 MPa. The elongation is more than or equalto 6%. Such key parts as the crankshaft prepared by the preparation method are reliable in quality and superior in performance.

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