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Methods for their preparation as well as ultra-high-strength steel and ultra-high-strength steel sheet excellent in low temperature toughness and pipeline deformation properties
Methods for their preparation as well as ultra-high-strength steel and ultra-high-strength steel sheet excellent in low temperature toughness and pipeline deformation properties
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机译：制备方法以及低温韧性和管线变形性能优异的超高强度钢板和超高强度钢板
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摘要
PROBLEM TO BE SOLVED: To provide an ultrahigh strength steel pipe having excellent pipe line deformation properties and high speed ductile fracture properties, and having a tensile strength of ≥800 MPa (100 times or more the API Specification), and to provide a method for producing the same.;SOLUTION: The ultrahigh strength steel pipe having excellent pipe line deformation properties and high speed ductile fracture properties contains, by weight, 0.03 to 0.10% C, 0.01 to 0.6% Si, 1.5 to 2.5% Mn, ≤0.015% P, ≤0.003% S, 0.1 to 2.0% Ni, 0.15 to 0.60% Mo, 0.001 to 0.10% Nb, 0.005 to 0.030% Ti and ≤0.06% Al, has structure in which the fraction of bainite or martensite in the structure of the steel sheet is ≥90%, and has a difference in tensile strength between the rolling width direction and the rolling longitudinal direction of ≥30 MPa, or a ratio in tensile strength between the rolling longitudinal direction and the rolling width direction of ≤0.97. The steel sheet is used therefor.;COPYRIGHT: (C)2006,JPO&NCIPI
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