New Steel Plate for Liquefied-Natural-Gas Storage Tank

Topics: Gas conversion (LNG/GTL)
Source: Getty Images.

For more than 50 years, 9% Ni steel with excellent mechanical properties at a cryogenic temperature of less than –162°C has been used as inner-tank material for liquefied-natural-gas (LNG) storage tanks. However, a reduction of the nickel content in steel can save construction costs of LNG storage tanks. A new steel plate for LNG storage tanks has been developed by optimizing chemical composition and applying recent thermomechanical-control-process (TMCP) technology.


With demand for LNG rising, construction of above-ground LNG storage tanks is expected to increase. 9% Ni steel plate has excellent strength and cryogenic toughness. For LNG storage tanks, a double-integrity structure has been proposed to prevent peremptory destruction (Fig. 1).

Although a high safety standard is demanded for such steel plates, in terms of saving construction costs of LNG tanks, a reduction in the amount of nickel used was desired. The new steel plate, equivalent to conventional 9% Ni steel, has been developed by adopting a TMCP to obtain the refined microstructure and a large amount of retained austenite.

This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 183286, “New Steel Plate for LNG Storage Tank,” by T. Kagaya, H. Furuya, T. Kamo, Y. Takahashi, H. Wakamatsu, and T. Nagao, Nippon Steel and Sumitomo Metal; H. Nishigami and S. Tomita, Osaka Gas; and S. Hirai and M. Mitsumoto, Toyo Kanetsu, prepared for the 2016 Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, 7–10 November. The paper has not been peer reviewed.
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New Steel Plate for Liquefied-Natural-Gas Storage Tank

01 April 2017

Volume: 69 | Issue: 4