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1 LNG Tank-Its Structure, the Materials and Welding Techniques Yasunosuke OGAWA, Mitsuhiro SAKAMOTO, Kiyoaki TOYOMASU, Mitsuo OHYAMA, Munemitsu FUKAGAWA, and Yoshinori SAIGA

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3 Table 2. Material list for various equipments of LNG plant. Fig. 2. General plan of double wall-dome roof on-ground LNG tank. Fig. 3. CSS (Composite Shell Segment) type inground LNG tank.

4 Table 3. Physical properties of low temperature materials for LNG4). Table 5. Specifications for nickel alloy steels (Mechanical properties). Fig. 5. Temperature dependence of tensile properties of 9%Ni steel (base metal)4).

5 Fig. 6. Charpy transition curves of 9% Ni steel, showing the effect of cooling rate after tempering heat treatment on absorbed energy at low temperature5).

6 Fig. 10. Comparison of absosbed energy of 9% Ni steel (24min thick) in longitudinal and transverse directions to rolling direction7).

7 Table 6. Specifications for 304 stainless steel, 5083 aluminum alloy and invar. Table 7. Examples of charpy absorbed energy on 304 SS and INVAR4).

8 Table 8. Examples of welding materials for 9% Ni steel.

9 Table 9. Examples of welded joints (9% nickel steel). Fig. 14. Test results of wide plate welded testplates with angular distortion and mis alignment (9% nickel steel). Fig. 13. Examples of hardness distribution at weld joint (9% nickel steel)

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Fig. 1 Sampling positions from the ingot. Table 2 Chemical compositions of base metal (%) Fig. 2 (unit: mm) Shape and size of fatigue test specimen. T

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