CASE HARDENED STEEL FOR COLD FORGING PULLEY EXCELLENT IN FATIGUE PEELING PROPERTY AND MANUFACTURING METHOD OF PULLEY USING THE SAME

PROBLEM TO BE SOLVED: To provide a case hardened steel for cold forging pulley capable of providing extremely high cold processability and excellent in fatigue peeling property.SOLUTION: A case hardened steel for cold forging pulley contains, by mass%, C:0.05 to 0.15%, Si:0.30% or less, Mn:0.80% or...

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Bibliographische Detailangaben
Hauptverfasser:	UCHIDA KAZUNARI, KATO TAKESHI, TOYODA HIROAKI, ISHIKURA RYOHEI, TAKESHITA TATSUMI, SHIMIZU TAKAYUKI, INOUE KEISUKE
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a case hardened steel for cold forging pulley capable of providing extremely high cold processability and excellent in fatigue peeling property.SOLUTION: A case hardened steel for cold forging pulley contains, by mass%, C:0.05 to 0.15%, Si:0.30% or less, Mn:0.80% or less, P:0.030% or less, S:0.030% or less, Cr:1.25 to 2.50%, Nb:0.030 to 0.15%, s-Al:0.025 to 0.060%, N:0.010 to 0.030% and the balance Fe with inevitable impurities, a steel material structure after hot rolling is constituted by ferrite and a second phase consisting of perlite and an inclusion, rolled material hardness before cold forging is 75 HRB or less and volume percentage of the second phase in the steel material structure is 25% or less.SELECTED DRAWING: Figure 1 【課題】極めて高い冷間加工性を得ることが可能で、疲労剥離特性にも優れた冷間鍛造プーリ用肌焼鋼を提供する。【解決手段】本発明の冷間鍛造プーリ用肌焼鋼は、質量％で、Ｃ：０．０５〜０．１５％、Ｓｉ：０．３０％以下、Ｍｎ：０．８０％以下、Ｐ：０．０３０％以下、Ｓ：０．０３０％以下、Ｃｒ：１．２５〜２．５０％、Ｎｂ：０．０３０〜０．１５％、ｓ−Ａｌ：０．０２５〜０．０６０％、Ｎ：０．０１０〜０．０３０％、を含有し、残部がＦｅ及び不可避不純物からなり、熱間圧延後の鋼材組織がフェライトと、パーライト及び介在物からなる第２相とで構成され、冷間鍛造前の圧延材硬さが７５ＨＲＢ以下で、かつ、鋼材組織中に占める第２相の体積率が２５％以下であることを特徴とする。【選択図】図１