High-strength steel, method for manufacturing high-strength steel, steel pipe, and method for manufacturing steel pipe

A high-strength steel having a specified chemical composition, wherein parameter Peff is 0.050% or more, the relationship (TS0−TS)/TS0≤0.050 is satisfied, wherein TS is defined as tensile strength determined at a temperature of 350° C. after aging has been performed under the condition of a Larson-M...

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Bibliographische Detailangaben
Hauptverfasser:	Endo, Shigeru, Shimamura, Junji, Ishikawa, Nobuyuki, Ota, Shusaku
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 METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	A high-strength steel having a specified chemical composition, wherein parameter Peff is 0.050% or more, the relationship (TS0−TS)/TS0≤0.050 is satisfied, wherein TS is defined as tensile strength determined at a temperature of 350° C. after aging has been performed under the condition of a Larson-Miller Parameter (LMP) of 15700, and wherein TS0 is defined as tensile strength determined at a temperature of 350° C. before the aging is performed, and having a toughness represented by a vE−20 of 100 J or more in a weld heat-affected zone, which is formed when welding is performed.