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    THICK HOT-ROLLED STEEL SHEET HAVING EXCELLENT PROCESSABILITY AND EXCELLENT STRENGTH/TOUGHNESS AFTER THERMAL TREATMENT, AND METHOD FOR PRODUCTION OF THE STEEL SHEET
    1.
    发明公开
    THICK HOT-ROLLED STEEL SHEET HAVING EXCELLENT PROCESSABILITY AND EXCELLENT STRENGTH/TOUGHNESS AFTER THERMAL TREATMENT, AND METHOD FOR PRODUCTION OF THE STEEL SHEET 有权
    具有优异的加工性能和优异的强度/韧性的热处理后和方法厚实保暖的热轧钢板用于生产钢板

    公开(公告)号：EP2184373A4

    公开(公告)日：2016-01-27

    申请号：EP08765546

    申请日：2008-06-06

    申请人： JFE STEEL CORP

    发明人： SETO KAZUHIRO ,  NAKAMURA NOBUYUKI ,  KOBAYASHI AKIO

    IPC分类号： C22C38/00 ,  C21D8/02 ,  C21D8/04 ,  C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

    CPC分类号： C22C38/02 ,  C21D8/0426 ,  C21D8/0473 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14

    摘要： Disclosed is a thick hot-rolled steel sheet which has a tensile strength of 440 to 640 MPa, preferably 490 to 590 MPa, an elongation of 20% or more, excellent uniformity in the thickness-wise direction, high strength, excellent processability, and excellent strength/toughness after a thermal treatment, and is therefore suitable for use as a structural member for an automobile, a construction machine or the like. Also disclosed is a method for producing the steel sheet. A steel material is provided, which contains 0.10 to 0.20% of C, in which the contents of Si, Mn, Al, P, S and N are adjusted within proper ranges, and which further contains 0.01 to 0.15% of Ti and 0.0010 to 0.0050% of B. The steel material is subj ected to the hot-rolling under the conditions of a rolling finishing temperature for the fmish rolling of 820 to 880°C. The resulting product is cooled at a cooling rate of 15 to 50°C/s and a cooling finishing temperature of 500 to 600°C, and is then wound-up in a coli-like shape. In this manner, the steel sheet can have a structure which is uniform in the thickness-wise direction and is composed of a bainitic ferrite phase. The steel sheet has excellent uniformity in the thickness-wise direction so that the fluctuation in the hardness in the thickness-wise direction falls within the range up to 10% above or below the average value, and has a tensile strength of 440 to 640 MPa and an elongation of 20% or more. The steel sheet may be subjected to a further thermal treatment, thereby producing a highly-strong, highly-tough, thick and large-sized structural member having a tensile strength of 980 MPa or more and a vTrs of -60°C or lower.

    摘要翻译： 公开了一种厚的热轧钢板，其具有的抗张强度440 640兆帕，在20％或更多伸长优选490至590兆帕，在厚度方向上，高强度，优异的加工性优良的均匀性，以及 优良的强度/热处理后的韧性，并因此适合用作在汽车用于结构构件，建筑机械等。 所以圆盘游离缺失是用于生产钢板的方法。 的钢材料被提供，其中含有12:10至00：C的20％，其中的Si，Mn的Al，P，S和N的内容被适当范围内调节，并且还含有12:01至00：Ti和0.0010的15％至 B.该钢材的0.0050％是SUBJ ected到轧制结束温度为820的fmish轧制的条件下，以880℃轧制热C. 将所得产物在15〜50℃/ s的冷却速度和500的冷却结束温度〜600℃被冷却，然后在大肠杆菌状卷绕。 在这种方式中，钢板可以具有这样的结构的所有这是在厚度方向上均匀的并且由贝氏体铁素体相。 钢板具有在厚度方向上均匀性优异所以没有在厚度方向上的硬度的波动，如果范围高达10％以上或以下的平均值内，且具有440〜640兆帕的抗张强度 并在20％或更高的伸长率。 所述钢板也可以被进行进一步的热处理，从而制得具有980MPa以上的拉伸强度和-60℃或更低的转变温度vTrs高，强，高坚韧，厚和大尺寸的结构构件。