SPHEROIDAL GRAPHITE CAST IRON AND MANUFACTURING METHOD OF SPHEROIDAL GRAPHITE CAST IRON

PROBLEM TO BE SOLVED: To provide a spheroidal graphite cast iron having high strength and high proof stress without conducting a specific heat treatment and using expensive rare metals.SOLUTION: There is provided a spheroidal graphite cast iron containing, by wt.%, C:3.20 to 4.00%, Si:1.40 to 3.00%,...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAMOTO KOJI, NISHIHARA YOSHIKAZU
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ALLOYS CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS POWDER METALLURGY PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL TRANSPORTING TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a spheroidal graphite cast iron having high strength and high proof stress without conducting a specific heat treatment and using expensive rare metals.SOLUTION: There is provided a spheroidal graphite cast iron containing, by wt.%, C:3.20 to 4.00%, Si:1.40 to 3.00%, Mg:0.02 to 0.08%, Cr:0.01 to 0.20%, further Mn:1.80 to 3.00%, Cu:0.50 to 2.00% and the balance Fe with inevitable impurities, and having area percentage of pearlite in a matrix structure after firing of 80% or more, area percentage of decomposed cementite in a range of 5 to 15% and both of high strength and high proof stress (proof stress ratio of 0.7 or more). 【課題】特殊な熱処理を行うことなく、かつ高価なレアメタルを使用せずに、高強度かつ高耐力を備えた球状黒鉛鋳を提供すること。【解決手段】重量％で、Ｃ：３．２０〜４．００％、Ｓｉ：１．４０〜３．００％、Ｍｇ：０．０２〜０．０８％、Ｃｒ：０．０１〜０．２０％を含有し、さらにＭｎ：１．８０〜３．００％、Ｃｕ：０．５０〜２．００％となる範囲で含有し、残部がＦｅ及び不可避的不純物からなり、焼鈍後の基地組織におけるパーライトの面積率が８０％以上であり、未分解のセメンタイトの面積率が５〜１５％の範囲内である、高強度と高耐力を兼ね備えた（耐力比０．７以上）球状黒鉛鋳鉄を構成する。【選択図】図１