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Volume 3: Materials Technology; Jan Vugts Symposium on Design Methodology of Offshore Structures; Jo Pinkster Symposium on Second Order Wave Drift Forces on Floating Structures; Johan Wichers Symposium on Mooring of Floating Structures in Waves | 2011

Development of 6% nickel steel for LNG storage tanks

Hitoshi Furuya; Naoki Saitoh; Yasunori Takahashi; Katsumi Kurebayashi; Yoichi Kayamori; Takehiro Inoue; Ryuji Uemori; Motohiro Okushima

9% Ni steel has been used for LNG storage tanks for more than four decades although 5.5% Ni steel (N-TUF CR196) was developed in the 1970’s using a special heat treatment method named L-treatment. The reason why the actual application of 5.5% Ni steel has not been attained to LNG storage tanks is mainly because the requirement of fracture properties is not confirmed for the tanks. Under the circumstances of expanding demand for natural gas and double-integrity in LNG storage tanks, we restarted developing low Ni steel for LNG storage tanks by using both conventional and advanced techniques. For the application of low Ni steel to the present LNG storage tanks, both fracture initiation and propagation properties of base metal plates and welded joints should be concerned. The fracture initiation and propagation properties of base metal were compensated with the intercritical reheating process (L-treatment), and the propagation property was additionally enhanced by combining TMCP with L-treatment. In addition, the chemical composition adjustment and the homogenization treatment of solute elements were conducted for improving the fracture initiation and propagation properties of welded joints. 6% Ni steel plates were manufactured by the process of continuous casting, reheating, hot rolling, direct quenching (TMCP), L-treatment, and tempering, and their chemical composition was 0.05C-0.06Si-1.0Mn-6.3Ni-Cr-Mo. As the results of fracture property evaluation including large-scale fracture tests such as the duplex ESSO test and the wide plate tensile test, it was demonstrated that 6% Ni steel has good characteristics regarding brittle fracture initiation and propagation in base metal plates and welded joints.Copyright


Abu Dhabi International Petroleum Exhibition & Conference | 2016

New Steel Plate for LNG Storage Tank

T. Kagaya; Hitoshi Furuya; Takahiro Kamo; Yasunori Takahashi; Hironori Wakamatsu; T. Nagao; H. Nishigami; S. Tomita; S. Hirai; M. Mitsumoto

A new low-nickel (6.0-7.5%Ni) steel plate for LNG storage tanks has been developed with performance equivalent to 9% Ni steel, which has been used for LNG storage tanks for several decades. This excellent performance equivalent to 9% Ni steel was achieved by reducing the amount of added nickel, optimizing the chemical composition, and by applying the latest Thermo-Mechanical Controlled Process (TMCP) technology to the steel plate, in order to contribute to cost savings and natural resource savings. Developed steel has been practically applied through joint research with customers and committees, and the expansion of its applications is progressing. * 鉄鋼研究所 厚板・形鋼研究部 千葉県富津市新富 20-1 〒 293-8511 図1 LNGタンク用鋼への要求特性 Prescribed properties for material of LNG tank


Archive | 2011

Ni-CONTAINING STEEL SHEET AND PROCESS FOR PRODUCING SAME

Hitoshi Furuya; Naoki Saitoh; Motohiro Okushima; Yasunori Takahashi; Takehiro Inoue; Ryuji Uemori


Archive | 2013

STEEL SHEET HAVING YIELD STRENGTH OF 670-870 N/mm2 AND TENSILE STRENGTH OF 780-940 N/mm2

Naoki Saitoh; 斎藤 直樹; Mitsuru Sawamura; 充 澤村; Katsumi Kurebayashi; 勝己 榑林; 康哲 ▲高▼橋; Yasunori Takahashi; Takumi Miyake; 拓海 三宅


Archive | 2011

Nickel steel plate and manufacturing process therefor

Hitoshi Furuya; Naoki Saitoh; Motohiro Okushima; Yasunori Takahashi


Archive | 2015

5-7.5 % Ni-CONTAINING STEEL SHEET

Hitoshi Furuya; Naoki Saitoh; Motohiro Okushima; Yasunori Takahashi; Takehiro Inoue; Ryuji Uemori


Archive | 2011

Ni-ADDED STEEL PLATE AND METHOD OF MANUFACTURING THE SAME

Hitoshi Furuya; Naoki Saitoh; Motohiro Okushima; Yasunori Takahashi; Takehiro Inoue; Ryuji Uemori


Archive | 2009

Steel plate that exhibits excellent low-temperature toughness in a base material and weld heat-affected zone and has small strength anisotropy, and manufacturing method thereof

Hitoshi Furuya; Naoki Saitoh; Motohiro Okushima; Yasunori Takahashi


The 27th International Ocean and Polar Engineering Conference | 2017

Development and Practical Application of 7% Ni-TMCP Steel for Large Capacity LNG Storage Tanks

Teppei Okawa; Takahiro Kamo; Hitoshi Furuya; Hironori Wakamatsu; Yasunori Takahashi; Toshimichi Nagao; Hiroshi Nishigami; Atsushi Iida; Sho Tomita; Shuichi Hirai; Masahiko Mitsumoto; Shutaro Shinpo


Archive | 2013

Stahlplatte mit einer steckgrenze von 670 bis 870 n/nm² und einer bruchfestigkeit von 780 bis 940 n/nm²

Naoki Saitoh; Mitsuru Sawamura; Katsumi Kurebayashi; Yasunori Takahashi; Takumi Miyake

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