HIGH CARBON STEEL SHEET EXCELLENT IN HOLE EXPANDABILITY AND ROLLING FATIGUE LIFE AND MANUFACTURING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide a high carbon steel sheet having excellent hole expandability and rolling fatigue and a manufacturing method therefor.SOLUTION: There is provided a high carbon steel sheet having a component composition containing, by mass%, C:0.95 to 1.10%, Si:0.15 to 0.35%, Mn:0 to...

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1. Verfasser:	TSUCHIDA TAKEHIRO
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 METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a high carbon steel sheet having excellent hole expandability and rolling fatigue and a manufacturing method therefor.SOLUTION: There is provided a high carbon steel sheet having a component composition containing, by mass%, C:0.95 to 1.10%, Si:0.15 to 0.35%, Mn:0 to 0.5%, Cr:1.30 to 1.60%, P:0 to 0.02%, S:0 to 0.02%, Al:0.005 to 0.04%, N:0.002 to 0.02% and the balance iron with inevitable impurities, average hardness and hardness variation of 180 to 210 HV and 10 HV or less respectively, and average circle equivalent diameter of 0.5 μm or less and average aspect ratio of 2.0 or less of carbide existing in the steel structure.SELECTED DRAWING: None 【課題】優れた穴広げ性と転動疲労を兼備する高炭素鋼板およびその製造方法を提供する。【解決手段】成分組成が、質量％で、Ｃ：０．９５〜１．１０％、Ｓｉ：０．１５〜０．３５％、Ｍｎ：０〜０．５％、Ｃｒ：１．３０〜１．６０％、Ｐ：０〜０．０２％、Ｓ：０〜０．０２％、Ａｌ：０．００５〜０．０４％、Ｎ：０．００２〜０．０２％であり、残部が鉄および不可避的不純物からなる高炭素鋼板であって、平均硬さおよび硬さばらつきが、それぞれ、１８０〜２１０ＨＶおよび１０ＨＶ以下であるとともに、鋼組織中に存在する炭化物について、その平均円相当直径が０．５μｍ以下で、かつその平均アスペクト比が２．０以下である高炭素鋼板。【選択図】なし