低温用 3.5%Ni UOE 鋼管の溶接部の靱性改善

概要

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Studies on welding method, consumables and heat treatment in the laboratory and mill production test have been conducted to produce 3.5% nickel steel UOE-pipes suitable to be used for around -100℃ service by the following process, namely, (A) normalized plates⇾UOE (inside : SAW/outside : MIG)⇾pipe SR and (B) as rolled plates⇾UOE (SAW)⇾pipe QT. The manufacturing procedure has been established by UOE process. (1) To weld pipe A using the wire of 1.6Mn-3.1Ni-Ti-B steel with the high current MIG process can give the high toughness to the weld metal and HAZ in both as welded and stress-relieved condition. (2) The optimum condition for the rapid heating cycle in a short time in pipe B is to quench at 950℃ and temper at 630℃ for 6 min. The hardness and toughness of weld metal and HAZ are improved by quenching and tempering. (3) Based on the above studies in the laboratory, both types of pipe A and B meeting with the standard of ASTM A671-CF71 and A333 Gr.3 have been developed and manufactured in the mill production scale.
社団法人日本鉄鋼協会の論文
1983-02-01