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    STEEL PLATE AND METHOD FOR MANUFACTURING SAME
    1.
    发明公开
    STEEL PLATE AND METHOD FOR MANUFACTURING SAME 审中-公开

    公开(公告)号：EP4458993A1

    公开(公告)日：2024-11-06

    申请号：EP23759577.2

    申请日：2023-01-26

    申请人： JFE Steel Corporation

    发明人： YASUDA Kyono ,  SHIOTANI Kazuhiko

    IPC分类号： C21D8/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/60

    摘要： A high strength steel plate having excellent ammonia SCC resistance and low-temperature toughness for use in storage tanks used to contain liquefied gas in energy transport ships. The steel plate has a defined chemical composition, and has hardness properties such that, at a 0.5 mm depth position from the surface of the steel plate, average hardness is 230HV0.1 or less and hardness variation is 30HV0.1 or less, a maximum value of hardness in the thickness direction is at a position 1.0 mm or more and 1/4 or less of the thickness of the steel plate from the surface of the steel plate, and hardness variation in the thickness direction is 70HV1 or less. Further, the steel plate has a metallic microstructure where, at a 0.5 mm depth position from the surface of the steel plate, a volume fraction of bainitic microstructure is 90 % or more.

    GRAIN-ORIENTED ELECTRICAL STEEL SHEET, AND MANUFACTURING METHOD THEREFOR
    3.
    发明公开
    GRAIN-ORIENTED ELECTRICAL STEEL SHEET, AND MANUFACTURING METHOD THEREFOR 审中-公开

    公开(公告)号：EP4455345A1

    公开(公告)日：2024-10-30

    申请号：EP22911673.6

    申请日：2022-12-01

    申请人： POSCO Co., Ltd

    发明人： KO, Kyungjun ,  LEE, Sangwoo

    IPC分类号： C22C38/38 ,  C22C38/06 ,  C22C38/00 ,  C21D8/12 ,  H01F1/147

    摘要： A method for manufacturing a grain-oriented electrical steel sheet, according to one embodiment of the present invention, comprises the steps of: hot rolling a slab so as to manufacture a hot rolled sheet, the slab comprising, by wt%, 2.5-4.0% of Si, 0.03-0.09% of C, 0.015-0.040% of Al, 0.04-0.15% of Mn, 0.01% or less of S (excluding 0%), 0.002-0.012% of N, 0.01-0.05% of Sb, 0.03-0.1% of Sn, 0.05-0.2% of Cr and the balance of Fe and inevitable impurities; cold rolling the hot rolled sheet so as to manufacture a cold rolled sheet; and performing secondary recrystallization annealing on the steel sheet having undergone primary recrystallization annealing.

    NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME
    5.
    发明公开
    NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME 审中-公开

    公开(公告)号：EP4455328A1

    公开(公告)日：2024-10-30

    申请号：EP22911853.4

    申请日：2022-12-20

    申请人： POSCO Co., Ltd

    发明人： JOO, Hyung Don ,  HONG, Jaewan ,  KIM, Yong-Soo ,  PARK, Junesoo ,  KIM, Yunsu

    IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/16 ,  C21D8/12 ,  H01F1/147

    摘要： A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention contains, by wt%: 0.005% or less (excluding 0%) of C, 1.5 to 3.0% of Si, 0.4 to 1.5% of Mn, 0.005% or less (excluding 0%) of S, 0.0001 to 0.7% of Al, 0.005% or less (excluding 0%) of N, 0.005% or less (excluding 0%) of Ti, 0.001 to 0.02% of Cu, 0.01 to 0.05% of Sb, 0.001 to 0.1% of Sn, and 0.005 to 0.07% of P, wherein contents of Mn, Si, and Al satisfy the following [Expression 1], contents of Sb, Sn, and P satisfy the following [Expression 2], the non-oriented electrical steel sheet contains a balance of Fe and unavoidably incorporated impurities, and the number of (Mn, Cu)S precipitates of 0.5 µm or less per area is 1/µm 3 or less: 0 .19 ≤ Mn / Si + 150 × Al ≤ 0 .35 1 / 2 * Sn Sb + P 0.09 .

    STRIP STEEL AND MANUFACTURING METHOD THEREFOR
    9.
    发明公开
    STRIP STEEL AND MANUFACTURING METHOD THEREFOR 审中-公开

    公开(公告)号：EP4446451A1

    公开(公告)日：2024-10-16

    申请号：EP23742688.7

    申请日：2023-01-04

    申请人： BAOSHAN IRON & STEEL CO., LTD.

    发明人： ZHAO, Yanliang ,  WEI, Xing ,  DAI, Yigang

    IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/34 ,  C22C38/38 ,  C23C22/76 ,  C23C22/78 ,  C23C22/82

    摘要： A steel strip having excellent workability and corrosion resistance that requires no oil coating, and a manufacturing method therefor. The steel strip comprises a substrate and a phosphatization layer and a stearate lubricant layer provided on the substrate. The upper surface of the steel strip sequentially comprises, from inside to outside, the phosphatization layer and the stearate lubricant layer, with a surface roughness R a in the range of 0.6 to 1.8 µm and R z in the range of 6 to 16 µm, providing good surface lubricity during extension process. The lower surface of the steel strip has the stearate lubricant layer with a surface roughness R a of 0.3 µm or less and R z of 2 µm or less, offering good lubricity and high surface cleanliness. By using the steel strip designed with differentiated functionality on two surfaces according to the present invention can be directly stamped to process high-precision and large-deformation shell parts, eliminating the traditional processes of coating, oiling, and cleaning after forming required for manufacturing the high-precision and large-deformation shell parts from conventional steel plates, significantly improving the efficiency of parts manufacturing. Additionally, the steel strip has good rust resistance and corrosion resistance, and the surfaces thereof require no oil-coating treatment during storage and transportation.