STEEL SHEET FOR LINE PIPE, METHOD FOR PRODUCING THE SAME, AND LINE PIPE

PROBLEM TO BE SOLVED: To provide a steel sheet for a high strength and high toughness line pipe having excellent ductility. SOLUTION: The steel sheet for a line pipe has a chemical composition comprising, by mass, 0.03 to 0.12% C, 0.05 to 0.9% Si, 0.50 to 2.50% Mn, ≤0.02% P, ≤0.005% S, 0.005 to 0.10...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAMURA HIROSHI, OKAGUCHI HIDEJI
Format:	Patent
Sprache:	eng
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 MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a steel sheet for a high strength and high toughness line pipe having excellent ductility. SOLUTION: The steel sheet for a line pipe has a chemical composition comprising, by mass, 0.03 to 0.12% C, 0.05 to 0.9% Si, 0.50 to 2.50% Mn, ≤0.02% P, ≤0.005% S, 0.005 to 0.100% sol.Al, ≤0.009% N and ≤0.005% O, and in which the value of äC+(Si/30)+(Mn/20)+(Cu/20)+(Ni/60)+(Cr/20)+(Mo/15)+(V/10)+5B} satisfies 0.15 to 0.22, and the balance Fe with impurities, has a microstructure composed of a mixed structure of ferrite having a Vickers hardness of ≤190 and a hard structure, and has a tensile strength of ≥590 MPa, and whose Charpy absorbed energy at -20°C is ≥100 J. The steel sheet may further contain Cu, Ni, Mo, V, Nb, B, Cr and Ti. COPYRIGHT: (C)2009,JPO&INPIT