METHOD FOR MANUFACTURING BENT STEEL PIPE

Bent steel pipe with good strength and low-temperature toughness is obtained by bending a steel pipe under the following conditions: heating temperature : from 900 to 1,150 DEG C, holding period : up to 15 minutes, and cooling rate : from 5 to 100 DEG C/second. The steel pipe comprises at least one...

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Hauptverfasser:	KAZUYOSHI UME, TADAAKI TAIRA, JUNICHIRO TAKEHARA
Format:	Patent
Sprache:	eng
Schlagworte:	AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL CHEMISTRY GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	Bent steel pipe with good strength and low-temperature toughness is obtained by bending a steel pipe under the following conditions: heating temperature : from 900 to 1,150 DEG C, holding period : up to 15 minutes, and cooling rate : from 5 to 100 DEG C/second. The steel pipe comprises at least one layer of steel sheet having the composition: carbon : from 0.002 to 0.050 wt.,%, silicon : from 0.05 to 0.80 wt.%, manganese : from 0.80 to 2.20 wt.%, niobium : from 0.002 to 0.100 wt.%, aluminium : from 0.01 to 0.08 wt.%, and nitrogen : from 0.002 to 0.010 wt.%, the balance being iron and incidental impurities. Optionally the steel sheet further contains, as a strength-improving constituent, at least one element selected from: copper : from 0.05 to 1.00 wt.%, nickel : from 0.05 to 3.00 wt.%, chromium : from 0.05 to 1.00 wt.%, molybdenum : from 0.03 to 0.80 wt.%, vanadium : from 0.01 to 0.10 wt.%, boron : from 0.0003 to 0.0030 wt.%, titanium : from 0.005 to 0.100 wt.%, and calcium : from 0.0002 to 0.0100 wt.%. c