STEEL PLATE

In a steel sheet, an A value is 4.5% or less, a Pcm value is 0.25% or less, a yield strength is 460 N/mm 2 to 580 N/mm 2 , a tensile strength is 550 N/mm 2 to 670 N/mm2, a difference between a hardness at 1/8t, which is a 1/8 thickness position from a surface of the steel plate in a through-thicknes...

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Bibliographische Detailangaben
Hauptverfasser:	SAITOH Naoki, KUREBAYASHI Katsumi, TAKAHASHI Yasunori
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:	In a steel sheet, an A value is 4.5% or less, a Pcm value is 0.25% or less, a yield strength is 460 N/mm 2 to 580 N/mm 2 , a tensile strength is 550 N/mm 2 to 670 N/mm2, a difference between a hardness at 1/8t, which is a 1/8 thickness position from a surface of the steel plate in a through-thickness direction, and a hardness at 1/2t, which is a 1/2 thickness position from the surface of the steel plate in the through-thickness direction, is 20 or less by Vickers hardness, and an average grain size at 1/8t is 35 µm or less.