HIGH-STRENGTH THICK-WALL ELECTRIC RESISTANCE WELDED STEEL TUBE HAVING EXCELLENT HARDENABILITY AND DECARBURIZATION RESISTANCE, AND ITS MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide a high-strength thick-wall electric resistance welded steel tube having excellent hardenability and decarburization resistance and also to provide its manufacturing method. SOLUTION: The thick-wall electric resistance welded steel tube has a composition consisting of...

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Hauptverfasser:	TAKASUGI NAOKI, ISHIZUKA TETSUO, MIMURA HIROYUKI, KOYUMIBA MOTOFUMI, ICHIYAMA TAKAHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BLASTING CHEMISTRY ENGINEERING ELEMENTS AND UNITS FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MEANS FOR DAMPING VIBRATION MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS SHOCK-ABSORBERS SPRINGS THERMAL INSULATION IN GENERAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS VEHICLE SUSPENSION ARRANGEMENTS VEHICLES IN GENERAL WEAPONS
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a high-strength thick-wall electric resistance welded steel tube having excellent hardenability and decarburization resistance and also to provide its manufacturing method. SOLUTION: The thick-wall electric resistance welded steel tube has a composition consisting of, by mass, 0.15 to 0.5% C, 0.05 to 0.5% Si, 0.3 to 2% Mn, ≤0.05% P, ≤0.05% S, ≤0.05% Al, 0.005 to 0.05% Ti, 0.0005 to 0.01% B, 0.001 to 0.01% N, further either or both of 0.01 to 0.2% Sb and 0.2 to 0.5% Cu and the balance Fe with inevitable impurities. Moreover, critical cooling velocity Vc represented by equality logVc=2.94-0.75β (where β=2.7+0.4Si+Mn) is 0.15 to 0.30. COPYRIGHT: (C)2007,JPO&INPIT