HYPEREUTECTIC FLAKE GRAPHITE CAST IRON ARTICLE AND MANUFACTURING METHOD THEREFOR

• Main Authors: SUGANO TOSHITAKE, KIKUCHI NAOAKI, IWAMI YUKI
• Format: Patent
• Language: English; Japanese
• Published: 26.01.2017
• Subjects: 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

PROBLEM TO BE SOLVED: To provide a low Si hypereutectic flake graphite cast iron article without chill excellent in vibration absorption and machinability and a manufacturing method therefor.SOLUTION: It contains, by wt.%, C:4.05 to 5.5%, Si:1.25% or less, Mn:2% or less, P:0.25% or less, S:0.2% or less and the balance Fe with inevitable impurities and having CEL=C%+0.23Si% of 4.33 to 5.55% and chill of 1% or less. Undissolved graphite is floated on a top face of a molten metal and an arbitrary temperature is held so that the molten metal has a target carbon value.SELECTED DRAWING: Figure 1 【課題】 振動吸収能及び切削性に優れた無チルの低Ｓｉ過共晶片状黒鉛鋳鉄およびその製造方法を提供すること。【解決手段】重量％で、Ｃ：４．０５〜５．５％、Ｓｉ：１．２５％以下、Ｍｎ：２％以下、Ｐ：０．２５％以下、Ｓ：０．２％以下を含有し残部がＦｅ及び不純物からなり、ＣＥＬ＝Ｃ％＋０．２３Ｓｉ％が４．３３〜５．５５％であり、チル１％以下である。溶湯上面に未溶解の黒鉛を浮かせ、溶湯が目標のカーボン値になるような任意の温度で保持する。【選択図】 図１