发明申请
US20070089814A1 High-strength hot-rolled steet excellent in shape fixability and method of producing the same 有权
形状稳定性优异的高强度热轧钢板及其制造方法

High-strength hot-rolled steet excellent in shape fixability and method of producing the same
摘要:
A high-strength hot-rolled steel sheet excellent in shape fixability having ferrite or bainite as the phase of the largest volume percentage, satisfying all of the following at least at ½ sheet thickness: a mean value of X-ray random intensity ratio in the orientation component group of {100} to {223} to X-ray random diffraction intensity ratio of at least 2.5; a mean value of X-ray random intensity ratio in the three crystal orientation components of {554} , {111} , and {111} to X-ray random diffraction intensity ratio of 3.5 or less; an X-ray intensity ratio to X-ray random diffraction intensity ratio at {100} of at least the X-ray random intensity to X-ray random diffraction intensity ratio at {211} ; and an X-ray random intensity ratio to X-ray random intensity ratio diffraction intensity ratio at {100} of at least 2.5, having at least one of an r-value of the rolling direction and an r-value of a direction perpendicular to the rolling direction of not more than 0.7, having an anisotropy ΔuE1 of uniform elongation of not more than 4%, having an anisotropy ΔLE1 of local elongation of at least 2%, and having an ΔuE1 of not more than the ΔLE1.
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