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    • 1. 发明授权
    • High-strength hot-rolled steel sheet and method of manufacturing the same
    • 高强度热轧钢板及其制造方法
    • US09121079B2
    • 2015-09-01
    • US13583537
    • 2011-03-09
    • Yuzo TakahashiJunji HajiOsamu Kawano
    • Yuzo TakahashiJunji HajiOsamu Kawano
    • C21D8/02C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14B21B3/00C21D9/46C22C38/00
    • C21D8/0226B21B3/00C21D9/46C21D2211/002C21D2211/003C21D2211/005C22C38/001C22C38/005C22C38/06C22C38/14
    • On a cross section with a sheet width direction of a high-strength hot-rolled steel sheet set as a normal line, with regard to an inclusion having a major diameter of 3.0 μm or more, a maximum of a major diameter/minor diameter ratio expressed by (a major diameter of the inclusion)/(a minor diameter of the inclusion) is 8.0 or less, and a sum total of a rolling direction length per 1 mm2 cross section of a predetermined inclusion group composed of plural inclusions each having a major diameter of 3.0 μm or more and a predetermined extended inclusion having a length in a rolling direction of 30 μm or more is 0.25 mm or less. The plural inclusions composing the predetermined inclusion group congregate in both the rolling direction and a direction perpendicular to the rolling direction 50 μm or less apart from each other. The predetermined extended inclusion is spaced over 50 μm apart from all the inclusions each having a major diameter of 3.0 μm or more in at least either the rolling direction or the direction perpendicular to the rolling direction.
    • 在作为法线设定的高强度热轧钢板的板宽方向的截面上,对于长径为3.0μm以上的夹杂物,最大直径/小直径比的最大值 由(夹杂物的主直径)/(夹杂物的微小直径)表示为8.0以下,并且由包含多个夹杂物的预定夹杂物组成的每1mm 2截面的轧制方向长度的总和 长径为3.0μm以上,预定长度为30μm以上的轧制方向的延伸夹杂物为0.25mm以下。 组成预定夹杂物的多个夹杂物在轧制方向和垂直于轧制方向的方向上聚集在50μm以下。 预定的延伸夹杂物在至少轧制方向或与轧制方向垂直的方向的至少任一个中具有大于3.0μm或更大的所有夹杂物的间隔超过50μm。
    • 3. 发明授权
    • High-strength steel plate having high dynamic deformation resistance and method of manufacturing the same
    • 具有高动态变形阻力的高强度钢板及其制造方法
    • US06319338B1
    • 2001-11-20
    • US09308986
    • 1999-07-06
    • Osamu KawanoYuzo TakahashiJunichi WakitaHidesato MabuchiManabu TakahashiAkihiro UenishiRiki OkamotoYukihisa KuriyamaYasuharu Sakuma
    • Osamu KawanoYuzo TakahashiJunichi WakitaHidesato MabuchiManabu TakahashiAkihiro UenishiRiki OkamotoYukihisa KuriyamaYasuharu Sakuma
    • C22C3308
    • C21D8/02C21D8/0226C21D8/0236C21D8/0273C21D2211/001C21D2211/002C21D2211/005C21D2211/008
    • The object of the present invention is to provide high-strength steel sheets exhibiting high impact energy absorption properties, as steel materials, to be used for shaping and working into such parts as front side members of automobiles which absorb impact energy upon collision, as well as a method for their production. The high-strength steel sheets of the invention which exhibit high impact energy absorption properties are high-strength steel sheets with high flow stress during dynamic deformation characterized in that the microstructure of the steel sheets in their final form is a composite microstructure of a mixture of ferrite and/or bainite, either of which is the dominant phase, and a third phase including retained austenite at a volume fraction between 3% and 50%, wherein the average value &sgr;dyn (MPa) of the flow stress in the range of 3˜10% of equivalent strain when deformed in a strain rate range of 5×102˜5×103 (1/sec) after pre-deformation of greater than 0% and less than or equal to 10% of equivalent strain, satisfies the inequality: &sgr;dyn≧0.766×TS+250 as expressed in terms of the maximum stress TS (MPa) in the static tensile test as measured in a strain rate range of 5×10−4˜5×10−3 (1/s) without deformation, and the work hardening coefficient between 1% and 5% of a strain is at least 0.080.
    • 本发明的目的是提供作为钢材的高冲击能量吸收性能的高强度钢板,用于成形和加工成在碰撞时吸收冲击能量的汽车前侧部件的部件,以及 作为其生产方法。 表现出高冲击能吸收性能的本发明的高强度钢板是在动态变形过程中具有高流动应力的高强度钢板,其特征在于,最终形式的钢板的微结构是复合组织, 铁素体和/或贝氏体,其中任何一个是主要相,第三相包括体积分数在3%至50%之间的残余奥氏体,其中流动应力的平均值sigmadyn(MPa)在3〜 在大于0%且小于等于等效应变的10%的预变形后,在5×102〜5×103(1 / sec)的应变速率范围内变形时的10%的当量应变满足以下不等式:sigmadyn> = 0.766 在静态拉伸试验中以5×10 -4〜5×10 -3(1 / s)的应变速度范围测定的无变形的最大应力TS(MPa)表示的xTS + 250,加工硬化系数1 %和5%的菌株在leas t 0.080。