BENT STEEL PIPE AND METHOD FOR PRODUCING SAME

A steel bend pipe (1) includes a straight pipe portion (2) and a bent portion (3) having a bending radius r not less than three times an outer diameter OD of the straight pipe portion (2), and has a chemical composition containing, in mass percent, C: 0.04 to 0.08%, Si: 0.05 to 0.50%, Mn: 1.00 to 1....

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Bibliographische Detailangaben
Hauptverfasser:	OE, Taro, KAMITANI, Hiroki, SENDAI, Yusuke
Format:	Patent
Sprache:	eng ; fre ; ger
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 JOINTS OR FITTINGS FOR PIPES LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MEANS FOR THERMAL INSULATION IN GENERAL MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PIPES PUNCHING METAL SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING THERMAL INSULATION IN GENERAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A steel bend pipe (1) includes a straight pipe portion (2) and a bent portion (3) having a bending radius r not less than three times an outer diameter OD of the straight pipe portion (2), and has a chemical composition containing, in mass percent, C: 0.04 to 0.08%, Si: 0.05 to 0.50%, Mn: 1.00 to 1.70%, P: 0.015% or less, S: 0.002% or less, Cu: 0 to 0.50%, Ni: 0 to 0.50%, Cr: 0 to 0.50%, Mo: 0 to 0.50%, Sol.Al: 0 to 0.10%, Ca: 0 to 0.0050%, Nb: 0 to 0.050%, V: 0 to 0.10%, and Ti: 0 to 0.030%, with the balance being Fe and impurities, wherein Ceq (= C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/15) is 0.35% or more, yield stresses of the straight pipe portion (2) and the bent portion (3) are 450 to 600 MPa, and Vickers hardnesses (HV10) of the straight pipe portion (2) and the bent portion (3) are 230 or less.