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    METHOD FOR REDUCING SURFACE CRACKS OF CASTING BLANK BY USING FERRITE PHASE
    4.
    发明公开
    METHOD FOR REDUCING SURFACE CRACKS OF CASTING BLANK BY USING FERRITE PHASE 审中-公开

    公开(公告)号：EP4144459A1

    公开(公告)日：2023-03-08

    申请号：EP21829482.5

    申请日：2021-06-25

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

    发明人： WANG, Yingchun ,  XU, Guodong ,  XU, Rongjun ,  FAN, Zhengjie ,  RUAN, Xiaoming ,  WANG, Yan

    IPC分类号： B22D11/22 ,  B22D11/124

    摘要： Provided is a method for reducing surface cracks of a casting slab by using ferrite phase. Cooling water is used to control the surface layer temperature of the casting slab before a straightening section of a casting machine, so that the surface layer of the casting slab is kept constant for a long time in the vicinity of the austenite-to-ferrite phase transition temperature of the steel; due to the long-time constant temperature, a ferrite layer is formed on the surface layer of the casting slab, thereby improving the proportion of ferrite in the surface layer structure of the casting slab, improving the plasticity of the surface layer structure of the casting slab by high plasticity property of the ferrite, and thus reducing cracks generated on the inner surface of the casting slab under the tensile stress in a straightening area. The method can not only control the surface layer structure of the casting slab, but also improve the plasticity of the surface layer of the casting slab, and reduce surface cracks of the casting slab.

    SECONDARY COOLING METHOD AND SECONDARY COOLING APPARATUS FOR CONTINUOUS CASTING SLAB
    5.
    发明公开
    SECONDARY COOLING METHOD AND SECONDARY COOLING APPARATUS FOR CONTINUOUS CASTING SLAB 审中-公开

    公开(公告)号：EP3998126A1

    公开(公告)日：2022-05-18

    申请号：EP20836022.2

    申请日：2020-07-06

    申请人： JFE Steel Corporation

    发明人： SUGIHARA Hirokazu ,  OSUKA Kenichi ,  UEOKA Satoshi

    IPC分类号： B22D11/124 ,  B22D11/22

    摘要： A secondary cooling method and a secondary cooling apparatus for a continuously cast slab by which secondary cooling can be efficiently performed without a large capital investment are provided.
    A secondary cooling method for a continuously cast slab by which a cast slab 3 cast by a continuous casting machine 1 is subjected to secondary cooling in a secondary cooling zone 11 including a vertical zone 5, a curved zone 7, and a horizontal zone 9 includes a first cooling step performed in a first cooling portion 13, which is an upstream portion in the horizontal zone 9, and a second cooling step performed in a second cooling portion 15, which is a downstream portion in the horizontal zone. The first cooling step includes cooling of the cast slab with cooling water supplied at a flow density of 300 to 4000 liter/(m 2 ·min) so that the cooling water on a surface of the cast slab is in a nucleate boiling state in the first cooling step. The second cooling step includes cooling of the cast slab with the cooling water supplied at a flow density of 2% or more and 50% or less of the flow density of the cooling water in the first cooling step so that the nucleate boiling state of the cooling water on the surface of the cast slab is maintained in the second cooling step.

    METHOD FOR PRODUCING CU-NI-SN ALLOY AND COOLER TO BE USED FOR SAME
    8.
    发明公开
    METHOD FOR PRODUCING CU-NI-SN ALLOY AND COOLER TO BE USED FOR SAME 审中-公开

    公开(公告)号：EP3888816A1

    公开(公告)日：2021-10-06

    申请号：EP21163991.9

    申请日：2021-03-22

    申请人： NGK Insulators, Ltd.

    发明人： ISHII, Kensuke

    IPC分类号： B22D11/00 ,  B22D11/124 ,  B22D11/22 ,  B22D11/049

    摘要： The present invention provides a method for producing a Cu-Ni-Sn alloy, which achieves both productivity and product quality by reducing internal cracks while shortening the time for cooling an ingot. The method for producing a Cu-Ni-Sn alloy is a method for producing a Cu-Ni-Sn alloy by a continuous casting method or a semi-continuous casting method, the method including a step of pouring a molten Cu-Ni-Sn alloy from one end of a mold, both ends of which are open, and continuously drawing out the alloy as an ingot from the other end of the mold while solidifying a part of the alloy, the part being near the mold, and a step of spraying mist-like liquid on the drawn-out ingot to cool the ingot, thereby making a cast product of the Cu-Ni-Sn alloy.