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Abstract

A high strength steel plate having excellent ammonia SCC resistance and low-temperature toughness for use in storage tanks and the like used to contain liquefied gas in energy transport ships. The steel plate has a defined chemical composition, in particular including one or more of Cu: 0.01% to 0.5 %, Cr: 0.01% to 1.0%, Sb: 0.01% to 0.50%, or Sn: 0.01% to 0.50%, and the chemical composition satisfies a defined relationship of the Cu, Cr, Sb, and Sn content. Further, a hardness property at a 1.0 mm depth position from the surface of the steel plate is 300 HV or less, and the metallic structure at a ½ thickness position of the steel plate has a volume fraction of bainitic microstructure of 20% or more and a total volume fraction of ferritic microstructure and bainitic microstructure of 60% or more.

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