STEEL SHEET AND METHOD FOR MANUFACTURING SAME

This steel sheet has a predetermined chemical composition, in which the area ratio of plate martensite is 10% or more, the average grain size of prior austenite grains is 2.0 µm to 10.0 µm, the maximum diameter thereof is 20.0 µm or less, the amount of solid solution C in martensite is 0.20 mass% or...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	TAKEDA Kengo, SANO Kohichi, KAWATA Hiroyuki
Format:	Patent
Sprache:	eng ; fre ; ger
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:	This steel sheet has a predetermined chemical composition, in which the area ratio of plate martensite is 10% or more, the average grain size of prior austenite grains is 2.0 µm to 10.0 µm, the maximum diameter thereof is 20.0 µm or less, the amount of solid solution C in martensite is 0.20 mass% or less, the average carbide size is 0.25 µm or less, the crystal orientation difference between plate martensite and another martensite adjacent thereto in the same prior austenite grain is 10.0° or less, and the P concentration at grain boundaries of the prior austenite grains is 4.0 at% or less.