STEEL SHEET, STEEL PIPE FOR LINE PIPE, AND PRODUCTION METHOD THEREFOR

Disclosed is a steel plate containing: C: 0.02 to 0.15% by mass, Si: 0.02 to 0.50% by mass, Mn: 0.6 to 2.0% by mass, P: more than 0% by mass and 0.030% by mass or less, S: more than 0% by mass and 0.003% by mass or less, Al: 0.010 to 0.080% by mass, Ca: 0.0003 to 0.0060% by mass, N: 0.001 to 0.01% b...

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Bibliographische Detailangaben
Hauptverfasser:	TASHIRO, Kiichiro, KAKIZAKI, Motoki
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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 TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	Disclosed is a steel plate containing: C: 0.02 to 0.15% by mass, Si: 0.02 to 0.50% by mass, Mn: 0.6 to 2.0% by mass, P: more than 0% by mass and 0.030% by mass or less, S: more than 0% by mass and 0.003% by mass or less, Al: 0.010 to 0.080% by mass, Ca: 0.0003 to 0.0060% by mass, N: 0.001 to 0.01% by mass, O: more than 0% by mass and 0.0045% by mass or less, with the balance being iron and inevitable impurities, wherein a Ca content, a S content and an O content satisfy the following formulae (1) and (2):where [Ca], [S] and [O] are contents (% by mass) of Ca, S and O respectively, and wherein an area ratio of a part that has a defect echo height of 20% or more is 0.05% or less.