18836351. STEEL PLATE AND METHOD OF PRODUCING SAME (JFE STEEL CORPORATION)
STEEL PLATE AND METHOD OF PRODUCING SAME
Organization Name
Inventor(s)
Kyono Yasuda of Chiyoda-ku, Tokyo JP
Kazuhiko Shiotani of Chiyoda-ku, Tokyo JP
STEEL PLATE AND METHOD OF PRODUCING SAME
This abstract first appeared for US patent application 18836351 titled 'STEEL PLATE AND METHOD OF PRODUCING SAME
Original Abstract Submitted
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.