WELDED STEEL PIPE HAVING EXCELLENT HYDROFORMABILITY AND METHOD FOR MAKING THE SAME

A welded steel pipe is formed by heating or soaking an untreated welded steel pipe having a steel composition containing, on the basis of mass percent: about 0.05% to about 0.2% C; about 0.2% or less of Si; about 1.5% or less of Mn; about 0.1% or less of P; about 0.01% or less of S; about 0.1% or le...

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1. Verfasser:	TAKAAKI TOYOOKA
Format:	Patent
Sprache:	eng ; spa
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 welded steel pipe is formed by heating or soaking an untreated welded steel pipe having a steel composition containing, on the basis of mass percent: about 0.05% to about 0.2% C; about 0.2% or less of Si; about 1.5% or less of Mn; about 0.1% or less of P; about 0.01% or less of S; about 0.1% or less of Al; and about 0.01% or less of N; and by reduction-rolling the treated steel pipe at a cumulative reduction rate of at least about 35% and a final rolling temperature of about 500 DEG C to about 900 DEG C. The welded steel pipe exhibits excellent hydroformability, i.e., has a tensile strength of at least about 400 MPa and an nxr product of at least about 0.22. The treated steel pipe is preferably reduction-rolled at a cumulative reduction rate of at least about 20% below the Ar3 transformation point. The welded steel pipe is suitable for forming structural components. Un tubo de acero soldado se forma al calentar o remojar un tubo de acero soldado no tratado que tiene una composicion de acero que contiene, en base al por ciento en masa: aproximadamente 0.05% a aproximadamente de 0.2% C; aproximadamente 0.2% o menos de Si; aproximadamente 1.5% o menos de Mn; aproximadamente 0.1% o menos de P; aproximadamente 0.01% o menos de S; aproximadamente 0.1% o menos de Al; y aproximadamente 0.01% o menos de N; y a laminar por reduccion el tubo de acero tratado a una velocidad de reduccion acumulativa de al menos aproximadamente 35% y una temperatura laminacion final de aproximadamente 500°C a aproximadamente 900°C. El tubo de acero soldado exhibe excelente hidroformabilidad, es decir, tiene una resistencia de traccion de al menos aproximadamente 400 MPa y un producto nxr de al menos aproximadamente 0.22. El tubo de acero tratado se lamina de manera preferente por reduccion a una velocidad de reduccion acumulativa de al memos aproximadamente 20% por abajo del punto de transformacion de Ar3. El tubo de acero soldado es adecuado para formar componentes estructurales.