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    HIGH-STRENGTH HOT-PRESSING MEMBER AND METHOD FOR PRODUCING SAME
    1.
    发明公开
    HIGH-STRENGTH HOT-PRESSING MEMBER AND METHOD FOR PRODUCING SAME 有权
    HOCHFESTES HEISSPRESSELEMENT UND VERFAHREN ZUR HERSTELLUNG DAVON

    公开(公告)号：EP3181715A1

    公开(公告)日：2017-06-21

    申请号：EP15851827

    申请日：2015-10-05

    Applicant: JFE STEEL CORP

    Inventor： NAKAGAWA KOICHI ,  YOKOTA TAKESHI ,  SETO KAZUHIRO

    IPC: C22C38/00 ,  B21D22/20 ,  C21D1/18 ,  C21D9/46 ,  C22C38/06 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28

    CPC classification number: C21D9/46 ,  B21D22/022 ,  B32B15/012 ,  B32B15/013 ,  B32B2255/06 ,  B32B2255/205 ,  C21D1/18 ,  C21D1/673 ,  C21D6/001 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C21D8/0436 ,  C21D2211/001 ,  C21D2211/008 ,  C22C18/00 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/34 ,  C22C38/38 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

    Abstract: Provided are a high-strength hot-pressed part and a method for manufacturing the part. A raw material is a steel sheet obtained by heating a cold-rolled steel sheet having a chemical composition containing, by mass%, C: 0.090% or more and less than 0.30% and Mn: 3.5% or more and less than 11.0% at a temperature in a temperature range equal to or higher than the Ac1 transformation temperature and 850°C or lower, by holding the heated steel sheet at the temperature for 100 seconds or more and 48 hours or less, and by cooling the steel sheet held at the temperature. The raw material is subjected to a heating process in which the raw material is held at a temperature in a temperature range of 800°C to 1000°C for 600 seconds or less and to a hot press forming process in which the heated material is subjected to press forming and quenching at the same time by using a forming tool in order to obtain a hot-pressed part having a specified shape. With this, it is possible to obtain a high-strength hot-pressed part having a microstructure including 3.0% or more of a retained austenite phase and the balance being a martensite phase and tensile properties represented by a tensile strength TS of 1500 MPa or more and a uniform elongation uEl of 6.0% or more. Also, in the case where the cold-rolled steel sheet to be used is a steel sheet having a Zn-based coating layer or an Al-based coating layer on the surface thereof, since it is possible to inhibit the generation of scale on the surface of the part, there is an increase in the productivity of a hot-pressed part.

    Abstract translation: 提供了一种高强度热压部件及其制造方法。 原料是将以质量％计含有C：0.090％以上且小于0.30％，Mn：3.5％以上且小于11.0％的化学组成的冷轧钢板， 通过将加热后的钢板保持在100秒以上且48小时以下的温度，并且将保持在该温度下的钢板冷却至Ac1相变点以上且850℃以下的温度范围内的温度 气温。 对原料进行加热处理，其中将原材料在800℃至1000℃的温度范围内保持600秒或更短的时间，并进行热压成形处理，其中使加热的材料经受 为了获得具有特定形状的热压部件，通过使用成形工具同时压制成形和淬火。 由此，能够得到具有包含3.0％以上的残留奥氏体相，其余为马氏体相，且拉伸强度TS为1500MPa以上的拉伸特性的高强度热压部件 和6.0％或更高的均匀伸长率uE1。 另外，在使用的冷轧钢板是在其表面具有Zn系被覆层或Al系被覆层的钢板的情况下，能够抑制 部件的表面，热压部件的生产率提高。

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