船体用鋼板のセパレーション許容値に関する一考察

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Taking up the ship hull steel plates produced by controlled rolling in α-γ (ferriteaustenite) two-phase region, a study was performed to explore the mechanism of generation of separation as well as to devise a method for quantitatively evaluating the generation of separation. Also, the steel plates developing the separation were examined for their mechanical strength, fracture toughness, and fatigue strength to establish an allowable limit of separation for their use in ship hull application. The conclusions obtained from the study performed this time may be capsulized as follows. (1) The steel plates produced by controlled rolling in two-phase region and developing the separation in the process indicate no appreciable adverse effects of the separation on their material properties (mechanical strength, fracture toughness, and fatigue strength) both in the rolling direction and perpendicular to the rolling direction, and equal or even exceed separation-free steel plates in overall characteristics. (2) With the steel plates produced by controlled rolling in two-phase region and developing the separation the decline in fracture toughness in the direction of plate thickness is of nearly same order as that of the separation-free steel plates when the maximum separation index SImax. is about 0.5 or less. (3) From (1) and (2) above, it can be said that the steel plates produced by controlled rolling in two-phase region and developing the separation may be used as the ship hull steel plate under the same conditions that are employed for the separation-free steel plates provided the maximum separation index is about 0.5 or less.
社団法人日本船舶海洋工学会の論文
1991-03-29

船体用鋼板のセパレーション許容値に関する一考察

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