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    • 5. 发明授权
    • Steel pipe having high formability and method for producing the same
    • 成形性高的钢管及其制造方法
    • US06632296B2
    • 2003-10-14
    • US10049481
    • 2002-02-06
    • Naoki YoshinagaNobuhiro FujitaManabu TakahashiYasuhiro ShinoharaTohru YoshidaNatsuko Sugiura
    • Naoki YoshinagaNobuhiro FujitaManabu TakahashiYasuhiro ShinoharaTohru YoshidaNatsuko Sugiura
    • C22C3802
    • C22C38/04C21D8/10C21D2201/00C21D2201/05C22C38/002C22C38/004C22C38/02C22C38/06Y10S148/909
    • The present invention provides a steel pipe excellent in formability during hydraulic forming and the like and a method to produce the same, and more specifically: a steel pipe excellent in formability having an r-value of 1.4 or larger in the axial direction of the steel pipe, and the property that the average of the ratios of the X-ray intensity in the orientation component group of {110} to {332} on the plane at the center of the steel pipe wall thickness to the random X-ray intensity is 3.5 or larger, and/or the ratio of the X-ray intensity in the orientation component of {110} on the plane at the center of the steel pipe wall thickness to the random X-ray intensity is 5.0 or larger; and a method to produce a steel pipe excellent in formability characterized by heating the steel pipe having the property that the ratio of the X-ray intensity in every one of the orientation components of {001} , {116} , {114} and {112} on the plane at the center of the mother pipe wall thickness to the random X-ray intensity is 3 or smaller to a temperature in the range from 650 to 1,200° C. and by applying working under a condition of a diameter reduction ratio of 30% or more and a wall thickness reduction ratio of 5 to 30%.
    • 本发明提供一种在液压成形等中成形性优异的钢管及其制造方法,更具体地说,在钢的轴向上具有r值为1.4以上的成形性优异的钢管 管子,以及在钢管壁厚度的中心的平面上{110} <110> <{115} <110>的取向成分组中的X射线强度的比率的平均值相对于 随机X射线强度为3.5以上,和/或在钢管壁厚中心的平面上{110} <110>的取向成分中的X射线强度与随机X射线 强度为5.0以上; 以及生产成型性优良的钢管的制造方法,其特征在于,加热具有{001} <110>,{116} <110>的各取向成分的X射线强度的比例的钢管, 在母管壁厚度中心的平面上的随机X射线强度的{114} <110>和{112} <110>为650以上1200℃以下的温度。 并且通过在直径减小率为30%以上,壁厚减少率为5〜30%的条件下进行加工。
    • 7. 发明授权
    • High-strength hot-rolled steel sheet excellent in shape fixability and method of producing the same
    • 定形性优异的高强度热轧钢板及其制造方法
    • US07485195B2
    • 2009-02-03
    • US10561133
    • 2004-06-28
    • Natsuko SugiuraManabu TakahashiNaoki YoshinagaKen Kimura
    • Natsuko SugiuraManabu TakahashiNaoki YoshinagaKen Kimura
    • C22C38/02C22C38/06C22C38/18C22C38/16C22C38/40C21D8/02
    • C22C38/06B21B1/26B21B2001/228B21B2001/383C21D8/0226C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/12C22C38/14
    • 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.
    • 一种具有铁素体或贝氏体作为最大体积百分比的相位的定形性优异的高强度热轧钢板,满足以下所有以下至少1/2片厚:X射线随机强度比的平均值 {100} <011>至{223} <110>的取向成分组与X射线随机衍射强度比为2.5以上; {554} 225,{111} <112>和{111} <110>的三个晶体取向成分的X射线随机强度比的X射线随机强度比的平均值与3.5以下的X射线随机衍射强度比 ; 至少在{211} <011>的X射线随机强度与X射线随机衍射强度比的{100} <011>的X射线强度比与X射线随机衍射强度比的X射线强度比。 并且在{100} <011>下的X射线随机强度比与X射线随机强度比衍射强度比至少为2.5,具有轧制方向的r值和r值的至少一个 具有垂直于轧制方向的方向不大于0.7,具有不大于4%的均匀伸长率的各向异性DeltauE1,具有至少2%的局部伸长率的各向异性ΔLE1,并且DeltauE1不大于ΔLE1。
    • 8. 发明申请
    • High-strength hot-rolled steet excellent in shape fixability and method of producing the same
    • 形状稳定性优异的高强度热轧钢板及其制造方法
    • US20070089814A1
    • 2007-04-26
    • US10561133
    • 2004-06-28
    • Natsuko SugiuraManabu TakahashiNaoki YoshinagaKen Kimura
    • Natsuko SugiuraManabu TakahashiNaoki YoshinagaKen Kimura
    • C21D8/02
    • C22C38/06B21B1/26B21B2001/228B21B2001/383C21D8/0226C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/12C22C38/14
    • 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.
    • 一种具有铁素体或贝氏体作为最大体积百分比的相位的定形性优异的高强度热轧钢板,满足以下所有以下至少1/2片厚:X射线随机强度比的平均值 {100} <011>至{223} <110>的取向成分组与X射线随机衍射强度比为2.5以上; {554} 225,{111} <112>和{111} <110>的三个晶体取向成分的X射线随机强度比的X射线随机强度比的平均值与3.5以下的X射线随机衍射强度比 ; 至少在{211} <011>的X射线随机强度与X射线随机衍射强度比的{100} <011>的X射线强度比与X射线随机衍射强度比的X射线强度比。 并且在{100} <011>下的X射线随机强度比与X射线随机强度比衍射强度比至少为2.5,具有轧制方向的r值和r值的至少一个 具有垂直于轧制方向的方向不大于0.7,具有不大于4%的均匀伸长率的各向异性DeltauE1,具有至少2%的局部伸长率的各向异性ΔLE1,并且DeltauE1不大于ΔLE1。