CLAD STEEL WELDED STEEL PIPE AND MANUFACTURING METHOD THEREOF

To provide a clad steel welded steel pipe excellent in low temperature toughness.SOLUTION: A clad steel welded steel pipe comprises C: 0.04-0.10%, Si: 0.10-0.30%, Mn: 1.30-1.80%, Ni: 0.10-0.50%, Cr: 0.01-0.10%, Mo: 0.05-0.40%, V: 0.02-0.06%, Nb: 0.01-0.04%, Ti: 0.005-0.025%, Al: 0.015-0.050%, N: 0.0...

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Bibliographische Detailangaben
Hauptverfasser:	HONMA YUTA, TAKIMOTO SHIN, MADARAME HIROKAZU, KAWAMURA TAKASHI, HASHI KUNIHIKO
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ALLOYS CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MACHINE TOOLS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS SOLDERING OR UNSOLDERING TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	To provide a clad steel welded steel pipe excellent in low temperature toughness.SOLUTION: A clad steel welded steel pipe comprises C: 0.04-0.10%, Si: 0.10-0.30%, Mn: 1.30-1.80%, Ni: 0.10-0.50%, Cr: 0.01-0.10%, Mo: 0.05-0.40%, V: 0.02-0.06%, Nb: 0.01-0.04%, Ti: 0.005-0.025%, Al: 0.015-0.050%, N: 0.0030-0.0100%, and has a base material and a laminated material having a Ti/N of 1.5-4.0. The clad steel welded steel pipe is heated and held at 950-1050°C in the first austenitizing step, cooled at an average cooling rate of 10-35°C/min, heated and held at 950-990°C in the second austenitizing step, cooled at an average cooling rate of 500-1500°C/min in the range of 700-500°C, and then tempered at 500-650°C at an AC1 point or lower.SELECTED DRAWING: Figure 1 【課題】低温靱性に優れたクラッド鋼溶接鋼管を得る。【解決手段】Ｃ：０．０４～０．１０％、Ｓｉ：０．１０～０．３０％、Ｍｎ：１．３０～１．８０％、Ｎｉ：０．１０～０．５０％、Ｃｒ：０．０１～０．１０％、Ｍｏ：０．０５～０．４０％、Ｖ：０．０２～０．０６％、Ｎｂ：０．０１～０．０４％、Ｔｉ：０．００５～０．０２５％、Ａｌ：０．０１５～０．０５０％、Ｎ：０．００３０～０．０１００％を含有し、Ｔｉ／Ｎが１．５～４．０の母材と合せ材を有するクラッド鋼溶接鋼管に、１段階目のオーステナイト化で９５０～１０５０℃に加熱保持後、平均冷却速度１０～３５℃／ｍｉｎで冷却し、２段階目のオーステナイト化で９５０～９９０℃の加熱保持後、７００℃～５００℃の範囲で平均冷却速度５００～１５００℃／ｍｉｎの冷却をし、その後ＡＣ１点以下の５００℃～６５０℃で焼戻しを行う。【選択図】図１