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高速度ラインパイプにおける溶接金属のじん性改善に関する研究

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.11 (1979) No.3

高速度ラインパイプにおける溶接金属のじん性改善に関する研究 Improvement of Weld MetalToughness High Grade Linepipes

志 賀 厚(Atsushi Shiga) 山 口 忠 政 (Tadamasa Yamaguchi) 井 村 英 俊 (Hidetoshi Imura) 坪井 潤一郎(Jun-ichiro Tsuboi)

要旨 : 溶接金属中の介在物は延性破壊抵抗に影響を及ぼしてシェルフエネルギーを左右し,また 介在物が少なくなると焼入性が高くなるのでミクロ組織を介して壁開破壊特性にも影響を 及ぼす。したがって,1 パス溶接金属のじん性を向上させるには,塩基性フラックスを使用 して介在物を減じ,アシキュラ・フェライト組織が得られるような組成のワイヤと組合わ せればよい。溶接金属のじん性に対するNb, V の影響はそれらの存在形態によって変化す るが,100Å以下の大きさで析出して地を硬化させたときの悪影響がもっとも大きい。 Synopsis :

The effects of welding materials and microalloys on the toughness of seam weld metals of linepipes are invstigated. Non-matallic inclusons affect largely not only the value of shelf energy byt also the toughness at low temperatures through the effect on microstructures. The best way of improving the weld metal toughness is to form the acicular ferrite stucture by using basic fluxes and Mn-Mo-Ti alloyed wires. The effects of Nb and V on the weld metal toughness vary accrding to their morphology in welds, and the one caused from the precipitation hardening by the carbo-nitrides less than 100Å in size is the most serious of them all.

(c)JFE Steel Corporation, 2003

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