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    PLATED STEEL SHEETS FOR HOT PRESS FORMING HAVING EXCELLENT HYDROGEN BRITTLENESS RESISTANCE AND IMPACT RESISTANCE, HOT PRESS FORMED PARTS, AND MANUFACTURING METHODS THEREOF
    3.
    发明公开
    PLATED STEEL SHEETS FOR HOT PRESS FORMING HAVING EXCELLENT HYDROGEN BRITTLENESS RESISTANCE AND IMPACT RESISTANCE, HOT PRESS FORMED PARTS, AND MANUFACTURING METHODS THEREOF 审中-公开

    公开(公告)号：EP4242341A1

    公开(公告)日：2023-09-13

    申请号：EP21889430.1

    申请日：2021-10-19

    申请人： POSCO Co., Ltd

    发明人： KIM, Sang-Heon ,  OH, Jin-Keun ,  KIM, Seong-Woo ,  HAN, Sang-Bin

    IPC分类号： C23C2/02 ,  C23C2/12 ,  C23C2/40 ,  C23G1/08 ,  C22C38/60 ,  C22C38/38 ,  C22C38/32 ,  C21D8/02 ,  B21D22/00

    摘要： Provided are plated steel sheets for hot press forming, hot press formed parts manufactured therefrom, and manufacturing methods thereof, the plated steel sheets for hot press forming comprising: a base steel sheet comprising, in weight percent, 0.14-0.5% of C, 0.001-1% of Si, 0.3-4% of Mn, 0.001-0.015% of P, 0.0001-0.02% of S, 0.001-0.1% of Al, 0.001-1% of Cr, 0.001-0.02% of N, 0.1% or less of Ti, 0.01% or less of B, 0.005-0.1% of Sb, and a balance of Fe and other inevitable impurities; an aluminum or aluminum alloy plated layer provided on at least one surface of the base steel sheet; and a Sb-rich layer provided between the base steel sheet and the plated layer, wherein relational expressions 1-1 and 1-2 below are satisfied. Sb max Sb coat ≥ 1.2 Sb max − Sb coat 2 × Δt ≥ 0.008 [In relational expressions 1-1 and 1-2, Sb coat represents the average Sb content in the plated layer, the unit thereof being weight percent. Sb max represents the maximum Sb content in the Sb-rich layer, the unit thereof being weight percent. △t represents the linear distance from the boundary between the plated layer and the Sb-rich layer, to the point where Sb max was measured, the unit thereof being µm.]

    HOT PRESS-FORMED PART, AND MANUFACTURING METHOD THEREOF
    4.
    发明公开
    HOT PRESS-FORMED PART, AND MANUFACTURING METHOD THEREOF 审中-公开

    公开(公告)号：EP4234732A2

    公开(公告)日：2023-08-30

    申请号：EP23169014.0

    申请日：2019-11-20

    申请人： POSCO Co., Ltd

    发明人： KIM, Seong-Woo ,  OH, Jin-Keun ,  KIM, Sang-Heon ,  CHUN, Hyo-Sik

    IPC分类号： C21D9/48

    摘要： The present invention provides a hot-press formed part comprising a plated steel plate and an aluminum alloy plated layer formed on the plated steel plate, wherein the aluminum alloy plated layer comprises: an alloying layer (I) formed on the plated steel plate and containing, by weight%, 5-30% of Al; an alloying layer (II) formed on the alloying layer (I) and containing, by weight%, 30 to 60% of Al; an alloying layer (III) formed on the alloying layer (II) and containing, by weight%, 20-50% of Al and 5-20% of Sl; and an alloying layer (IV) formed continuously or discontinuously on at least a part of the surface of the alloying layer (III), and containing 30-60% of Al, wherein the rate of the alloying layer (III) exposed on the outermost surface of the aluminum alloy plated layer is 10% or more.

    METHOD FOR MANUFACTURING TAILOR WELDED BLANK USING STEEL SHEET FOR HOT PRESSING HAVING AL-FE-BASED INTERMETALLIC ALLOY LAYER
    7.
    发明公开
    METHOD FOR MANUFACTURING TAILOR WELDED BLANK USING STEEL SHEET FOR HOT PRESSING HAVING AL-FE-BASED INTERMETALLIC ALLOY LAYER 审中-公开

    公开(公告)号：EP4265366A1

    公开(公告)日：2023-10-25

    申请号：EP21907166.9

    申请日：2021-12-17

    申请人： POSCO Co., Ltd

    发明人： UHM, Sang-Ho ,  OH, Jin-Keun

    IPC分类号： B23K26/21 ,  C23C2/28 ,  C23C2/12 ,  C23C2/40 ,  B23K101/18

    摘要： An embodiment of the present invention provides a method for manufacturing a tailor welded blank using a steel sheet for hot pressing having an Al-Fe-based intermetallic alloy layer, the method comprising the steps of: preparing a plated steel sheet having a base steel sheet and an aluminum-based plated layer formed on one surface or both surfaces of the base steel sheet; heat-treating the plated steel sheet so that the aluminum-based plated layer becomes an Al-Fe-based intermetallic alloy layer; and subjecting the heat-treated plated steel sheet to butt welding, wherein, before the welding, a part or the entirety of the Al-Fe-based intermetallic alloy layer located in an area to be welded is removed.

    HOT PRESS-FORMED PART, AND MANUFACTURING METHOD THEREOF
    9.
    发明公开
    HOT PRESS-FORMED PART, AND MANUFACTURING METHOD THEREOF 审中-公开

    公开(公告)号：EP4234732A3

    公开(公告)日：2023-09-06

    申请号：EP23169014.0

    申请日：2019-11-20

    申请人： POSCO Co., Ltd

    发明人： KIM, Seong-Woo ,  OH, Jin-Keun ,  KIM, Sang-Heon ,  CHUN, Hyo-Sik

    IPC分类号： C21D9/48

    摘要： The present invention provides a hot-press formed part comprising a plated steel plate and an aluminum alloy plated layer formed on the plated steel plate, wherein the aluminum alloy plated layer comprises: an alloying layer (I) formed on the plated steel plate and containing, by weight%, 5-30% of Al; an alloying layer (II) formed on the alloying layer (I) and containing, by weight%, 30 to 60% of Al; an alloying layer (III) formed on the alloying layer (II) and containing, by weight%, 20-50% of Al and 5-20% of Sl; and an alloying layer (IV) formed continuously or discontinuously on at least a part of the surface of the alloying layer (III), and containing 30-60% of Al, wherein the rate of the alloying layer (III) exposed on the outermost surface of the aluminum alloy plated layer is 10% or more.