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    • 6. 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。