High-strength steel sheet having excellent ductility and low-temperature toughness and method for manufacturing thereof
a high-strength steel and low-temperature toughness technology, applied in the field of structural steel sheets, can solve the problems of increased construction period or manufacturing cost, ship accidents, cracks, etc., and achieve excellent low-temperature toughness, high strength, and high ductility.
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[0021]In general, as the strength of steel increases, the ductility of the steel is relatively reduced. Accordingly, it is not easy to manufacture steel having high strength and excellent elongation. In addition, the high elongation of steel does not necessarily mean that the steel has excellent low-temperature toughness, so it is more difficult to secure excellent low-temperature toughness as well as high strength and high ductility.
[0022]However, as the present inventors have deeply researched the development of a steel sheet capable of securing the low-temperature toughness as well as the high strength and high ductility, the present inventors found that it is possible to provide a steel sheet having target mechanical properties by defining alloy compositions and manufacturing conditions as follows, and reached the completion of the present disclosure.
[0023]Hereinafter, the present disclosure will be described in detail.
[0024]According to an aspect of the present disclosure, a hi...
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