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    HIGH-STRENGTH STEEL HAVING EXCELLENT BRITTLE CRACK ARRESTABILITY AND WELDING PART BRITTLE CRACK INITIATION RESISTANCE, AND PRODUCTION METHOD THEREFOR
    3.
    发明申请
    HIGH-STRENGTH STEEL HAVING EXCELLENT BRITTLE CRACK ARRESTABILITY AND WELDING PART BRITTLE CRACK INITIATION RESISTANCE, AND PRODUCTION METHOD THEREFOR 审中-公开

    公开(公告)号：US20180363081A1

    公开(公告)日：2018-12-20

    申请号：US15780175

    申请日：2016-12-02

    Applicant: POSCO

    Inventor： Hak-Cheol LEE ,  Sung-Ho JANG

    IPC: C21D8/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/04 ,  C22C38/02 ,  C21D9/46

    Abstract: The present invention provides a high-strength steel and a production method therefor, the high-strength steel: comprising, in wt %, C: 0.05-0.09%, Mn: 1.5-2.2%, Ni: 0.3-1.2%, Nb: 0.005-0.04%, Ti: 0.005-0.004%, Cu: 0.1-0.8%, Si: 0.05-0.03%, Al: 0.005-0.05%, P: 100 ppm or less, S: 40 ppm or less, and a remainder made up by Fe and other inevitable impurities; having a center part microstructure comprising an acicular ferrite and granular bainite mixed-phase, upper bainite, and a remainder made up by one type or more selected from the group consisting of ferrite, pearlite, and a martensite-austenite (MA) constituent; having, in a 2 mm or less subsurface region, a surface part microstructure comprising ferrite and a remainder made up by one type or more among bainite and martensite, and having a welding heat affected zone, which is formed during welding, that comprises, in area %, 5% or less of a martensite-austenite constituent.

    HIGH STRENGTH STEEL SHEET HAVING EXCELLENT CRYOGENIC TEMPERATURE TOUGHNESS AND LOW YIELD RATIO PROPERTIES, AND METHOD FOR MANUFACTURING SAME
    4.
    发明申请
    HIGH STRENGTH STEEL SHEET HAVING EXCELLENT CRYOGENIC TEMPERATURE TOUGHNESS AND LOW YIELD RATIO PROPERTIES, AND METHOD FOR MANUFACTURING SAME 审中-公开
    具有优异的低温韧性和低屈服强度的高强度钢板及其制造方法

    公开(公告)号：US20150315682A1

    公开(公告)日：2015-11-05

    申请号：US14654649

    申请日：2012-12-28

    Applicant: POSCO

    Inventor： Sung-Ho JANG ,  Woo-Gyeom KIM ,  Ki-Hyun BANG

    IPC: C22C38/16 ,  C21D6/00 ,  C21D9/46 ,  C22C38/02 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C21D8/02 ,  C22C38/14

    Abstract: A high strength steel sheet comprises 0.02 to 0.12 wt % of carbon (C), 0.5 to 2.0 wt % of manganese (Mn), 0.05 to 0.5 wt % of silicon (Si), 0.05 to 1.0 wt % of nickel (Ni), 0.005 to 0.1 wt % of titanium (Ti), 0.005 to 0.5 wt % of aluminum (Al), 0.015 wt % or less of phosphorus (P), 0.015 wt % or less of sulfur (S), and the balance of Fe and other inevitable impurities. The microstructure thereof includes 70% to 90% of ultrafine ferrite and 10% to 30% of MA (martensite/austenite) structure by area fraction, and the yield ratio (YS/TS) thereof is 0.8 or less.

    Abstract translation: 高强度钢板包含碳（C）0.02〜0.12重量％，锰（Mn）0.5〜2.0重量％，硅（Si）0.05〜0.5重量％，镍（Ni）0.05〜1.0重量％ 0.005〜0.1重量％的钛（Ti），0.005〜0.5重量％的铝（Al），0.015重量％以下的磷（P），0.015重量％以下的硫（S），余量为Fe 其他不可避免的杂质。 其微细结构包括70％至90％的超细铁素体和10％至30％的MA（马氏体/奥氏体）结构，面积分数，其屈服比（YS / TS）为0.8以下。

    HIGH-STRENGTH STEEL HAVING EXCELLENT BRITTLE CRACK ARRESTABILITY AND WELDING PART BRITTLE CRACK INITIATION RESISTANCE, AND PRODUCTION METHOD THEREFOR
    5.
    发明申请
    HIGH-STRENGTH STEEL HAVING EXCELLENT BRITTLE CRACK ARRESTABILITY AND WELDING PART BRITTLE CRACK INITIATION RESISTANCE, AND PRODUCTION METHOD THEREFOR 审中-公开

    公开(公告)号：US20180363107A1

    公开(公告)日：2018-12-20

    申请号：US15780170

    申请日：2016-12-02

    Applicant: POSCO

    Inventor： Hak-Cheol LEE ,  Sung-Ho JANG

    IPC: C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D8/02

    Abstract: The present invention provides a high-strength steel and a production method therefor, the high-strength steel: comprising, in wt %, C: 0.05-0.09%, Mn: 1.5-2.0%, Ni: 0.3-0.8%, Nb: 0.005-0.04%, Ti: 0.005-0.04%, Cu: 0.1-0.5%, Si: 0.05-0.3%, Al: 0.005-0.05%, P: 100 ppm or less, S: 40 ppm or less, and a remainder made up by Fe and other inevitable impurities; having a center part microstructure comprising, in area %, 70% or more of acicular ferrite and 10% or more of pearlite, wherein the equivalent circular diameter of the pearlite is 15 μm(micrometers) or less; having, in a 2 mm or less subsurface region, a microstructure comprising, in area %, 30% or more of one type or more among ferrite and a remainder made up by bainite, martensite, and pearlite; and having a welding heat affected zone, which is formed when welding, that comprises, in area %, 5% or less of a martensite-austenite constituent.

    HIGH-STRENGTH STEEL HAVING SUPERIOR BRITTLE CRACK ARRESTABILITY, AND PRODUCTION METHOD THEREFOR
    7.
    发明申请
    HIGH-STRENGTH STEEL HAVING SUPERIOR BRITTLE CRACK ARRESTABILITY, AND PRODUCTION METHOD THEREFOR 审中-公开

    公开(公告)号：US20190093204A1

    公开(公告)日：2019-03-28

    申请号：US15535607

    申请日：2015-12-21

    Applicant: POSCO

    Inventor： Hak-Cheol LEE ,  Sung-Ho JANG

    IPC: C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/02 ,  C21D8/02

    Abstract: Provided are high-strength steel having superior brittle crack arrestability and a production method therefor. The high-strength steel comprises 0.05-0.1 wt % of C, 1.5-2.2 wt % of Mn, 0.3-1.2 wt % of Ni, 0.005-0.1 wt % of Nb, 0.005-0.1 wt % of Ti, 0.1-0.5 wt % of Cu, 0.1-0.3 wt % of Si, at most 100 ppm of P, and at most 40 ppm of S with the remainder being Fe and other inevitable impurities, has microstructures including one structure selected from the group consisting of a single-phase structure of ferrite, a single phase structure of bainite, a complex-phase structure of ferrite and bainite, a complex-phase structure of ferrite and pearlite, and a complex-phase structure of ferrite, bainite, and pearlite, and has a thickness of at least 50 mm. The high-strength steel has high yield strength and superior brittle crack arrestability.

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