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LNGタンク用9%Ni鋼板の製造

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.14 (1982) No.1

LNG タンク用 9%Ni 鋼板の製造

Production of 9% Ni Steel Plates for Liquefied Natural Gas Tankage

鈴木 重治(Shigeharu Suzuki) 中野 善文(Yoshifumi Nakano) 広瀬 圭介(Keisuke Hirose) 奥 村 健 人 (Taketo Okumura) 西 川 廣 (Hiroshi Nishikawa) 佐 藤 峯 夫 (Mineo Sato) 要旨 : 近年,LNG タンクの大型化に伴い,その安全性を確保するため,主要構造材である 9%Ni 鋼板に対しても,より高いレベルの低温靭性が要求されている。当社においても低温靭性 の向上を目的として製造方法の改善を重ねてきたが,この程知多LNG 基地の 80000κl LNG タンク用材として,約 3000t の鋼板を製造,納入したので,この製造に当たって留意点, 実績を述べた。P,S の含有量を下げ,各製造工程の管理を厳重に実施した結果,製品の特性, 特に低温靭性は従来になく優れたものであった。また,溶接継手性能,破壊靭性について も最近の検討結果の一例を述べたが,LNG タンク用材として十分な特性を示した。 Synopsis :

Along with the continuous increase in the size of LNG tanks, high toughness at low temperatures has been required of the main structural steels or 9% Ni steels with respect to fracture toughness at low temperatures and supplied 3000 tons of steel plates for the 80000-kl LNG tanks at Chita LNG Receiving Terminal. The present paper describes the properties of the 9% Ni steel produced recently and the main controlling items in the production. As a result of lowering phosphorus and sulfur contents and the strict control of the production line, the properties, especially the toughness at low temperatures, of the 9% Ni steel plates were much improved compared with those produces in the past. The properties of weld joints and fracture toughness showed that the 9% Ni steel plates are suited for the structural material of LNG tanks.

(c)JFE Steel Corporation, 2003

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