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    HIGH-STRENGTH STEEL HAVING SUPERIOR BRITTLE CRACK ARRESTABILITY, AND PRODUCTION METHOD THEREFOR
    1.
    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.

    HIGH-STRENGTH STEEL HAVING EXCELLENT BRITTLE CRACK ARRESTABILITY AND WELDING PART BRITTLE CRACK INITIATION RESISTANCE, AND PRODUCTION METHOD THEREFOR
    4.
    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.

    ULTRA-THICK STRUCTURAL STEEL HAVING EXCELLENT BRITTLE CRACK INITIATION RESISTANCE, AND MANUFACTURING METHOD THEREFOR
    5.
    发明申请
    ULTRA-THICK STRUCTURAL STEEL HAVING EXCELLENT BRITTLE CRACK INITIATION RESISTANCE, AND MANUFACTURING METHOD THEREFOR 有权

    公开(公告)号：US20220056544A1

    公开(公告)日：2022-02-24

    申请号：US17414064

    申请日：2019-12-02

    Applicant: POSCO

    Inventor： Hak-Cheol LEE

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

    Abstract: One embodiment of the present invention provides an ultra-thick structural steel having excellent brittle crack initiation resistance, and a manufacturing method therefor, the ultra-thick structural steel comprising, by wt %, 0.03-0.08% of C, 1.6-2.2% of Mn, 0.6-1.3% of Ni, 0.005-0.03% of Nb, 0.005-0.02% of Ti, 0.1-0.4% of Cu, 100 ppm or less of P, 40 ppm or less of S, 1.5 ppm or less of H, and the balance of Fe and other inevitable impurities, wherein the sum of acicular ferrite and granular bainite in the microstructure is 80% or more by area fraction, the sum of the total length of cracks having a size of 30 μm or more per unit area of 1 mm2 in a ±1 mm region on the basis of the thickness center of the steel is 130 μm or less, and the yield strength is 500 MPa or more.

    STEEL FOR LOW-TEMPERATURE SERVICE HAVING EXCELLENT SURFACE PROCESSING QUALITY
    7.
    发明申请
    STEEL FOR LOW-TEMPERATURE SERVICE HAVING EXCELLENT SURFACE PROCESSING QUALITY 审中-公开
    具有优异表面加工质量的低温钢材

    公开(公告)号：US20160319407A1

    公开(公告)日：2016-11-03

    申请号：US15102662

    申请日：2014-12-19

    Applicant: POSCO

    Inventor： Soon-Gi LEE ,  In-Shik SUH ,  Hak-Cheol LEE ,  In-Gyu PARK

    IPC: C22C38/58 ,  C22C38/42 ,  C22C38/38 ,  C22C38/22 ,  C21D9/46 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  B21B3/00 ,  C22C38/20

    CPC classification number: C22C38/58 ,  B21B3/00 ,  C21D6/005 ,  C21D9/46 ,  C21D2211/001 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/38 ,  C22C38/42

    Abstract: Steel for low-temperature service having a high degree of surface processing quality comprises: manganese (Mn): 15 wt % to 35 wt %, carbon (C) satisfying conditions of: 23.6C+Mn≧28 and 33.5C−Mn≦23, copper (Cu): 5 wt % or less (excluding 0 wt %), nitrogen (N): 1 wt % or less (excluding 0 wt %), chromium (Cr) satisfying a condition of: 28.5C+4.4Cr≦57, nickel (Ni): 5 wt % or less, molybdenum (Mo): 5 wt % or less, silicon (Si): 4 wt % or less, aluminum (Al): 5 wt % or less, and a balance of iron (Fe) and inevitable impurities. Stacking fault energy (SFE) of the steel is 24 mJ/m2 or greater. The SFE is calculated by a formula: SFE (mJ/m2)=1.6Ni−1.3Mn+0.06Mn2−1.7Cr+0.01Cr2+15Mo−5.6Si+1.6Cu+5.5Al−60(C+1.2N)1/2+26.3(C+1.2N)(Cr+Mn+Mo)1/2+0.6[Ni(Cr+Mn)]1/2.

    Abstract translation: 具有高表面处理质量的低温服务用钢包括：锰（Mn）：15重量％〜35重量％，满足条件为23.6℃+Mn≥28且33.5℃〜Mn≤23的碳（C） ，铜（Cu）：5重量％以下（不含0重量％），氮（N）：1重量％以下（不含0重量％），满足以下条件的铬（Cr）：28.5℃+4.4Cr≤ 57，镍（Ni）：5重量％以下，钼（Mo）：5重量％以下，硅（Si）：4重量％以下，铝（Al）：5重量％以下，余量 铁（Fe）和不可避免的杂质。 钢的堆积断层能量（SFE）为24 mJ / m2以上。 SFE通过以下公式计算：SFE（mJ / m 2）= 1.6Ni-1.3Mn + 0.06Mn2-1.7Cr + 0.01Cr2 + 15Mo-5.6Si + 1.6Cu + 5.5Al-60（C + 1.2N）1 / 2 + 26.3（C + 1.2N）（Cr + Mn + Mo）1/2 + 0.6 [Ni（Cr + Mn）] 1/2。

    HIGH-STRENGTH STEEL HAVING EXCELLENT BRITTLE CRACK ARRESTABILITY AND WELDING PART BRITTLE CRACK INITIATION RESISTANCE, AND PRODUCTION METHOD THEREFOR
    9.
    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.

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