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HIGH-STRENGTH STEEL PLATE AND HIGH-STRENGTH STEEL PIPE HAVING EXCELLENT DEFORMABILITY AND LOW-TEMPERATURE TOUGHNESS, AND MANUFACTURING METHODS THEREFOR
HIGH-STRENGTH STEEL PLATE AND HIGH-STRENGTH STEEL PIPE HAVING EXCELLENT DEFORMABILITY AND LOW-TEMPERATURE TOUGHNESS, AND MANUFACTURING METHODS THEREFOR
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机译:具有出色的变形性和低温韧性的高强度钢板和高强度钢管及其制造方法
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摘要
Provided are a high-strength steel plate and high-strength steel pipe having excellent deformability and low-temperature toughness, by which it is possible to suppress the reduction of thickness during deformation, and manufacturing methods therefor. The high-strength steel plate is characterized in that it comprises a composition within a predetermined numeral value range, it comprises a complex structure with one or more types of ferrite, bainite, and martensite; the effective crystal particle diameter in the central part of the thickness is 20 µm or less; the X-ray random intensity ratio of a {111} plane parallel to the surface of the plate in the central part of the thickness is 0.5-5.0; the X-ray random intensity ratio of a {554} plane is 1.0-3.0; the X-ray random intensity ratio of a {100} plane is 3.0 or less; the X-ray random intensity ratios of a {112} plane and a {223} plane are both 0.5-4.0; the thickness is equal to or greater than 25 mm; and the tensile strength is equal to or greater than 565 MPa.
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