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公开(公告)号：US20240124963A1
公开(公告)日：2024-04-18
申请号：US18277966
申请日：2022-02-25
发明人： Satoshi HIRONAKA , Mai NAGANO , Yasuhiro ITO , Takuya TAKAYAMA
IPC分类号： C22C38/60 , C21D1/84 , C21D6/00 , C21D8/02 , C21D9/46 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/32 , C22C38/38
CPC分类号： C22C38/60 , C21D1/84 , C21D6/001 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/021 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0278 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/32 , C22C38/38 , C21D2211/005 , C23C2/285
摘要： An objective of the present invention is to provide a steel sheet having a high strength which can provide excellent appearance quality. The steel sheet has a chemical composition including, in mass %, C: more than 0.030% to 0.145%, Si: 0% to 0.500%, Mn: 0.50% to 2.50%, P: 0% to 0.100%, S: 0% to 0.020%, Al: 0% to 1.000% or less, N: 0% to 0.0100%, and the like, wherein a metal micro-structures consisting of 70 to 95% of ferrite in volume fraction and 5 to 30% of hard phases in volume fraction, and a value X1 obtained by dividing a standard deviation of average Mn concentrations in a rolling direction at ¼ sheet-thickness positions in a sheet thickness direction by an average Mn concentration at the ¼ sheet-thickness positions is 0.025 or less.
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2.发明申请公开(公告)号：US20210205877A1
公开(公告)日：2021-07-08
申请号：US17059686
申请日：2019-06-07
发明人： Hiroshi HARADA , Keita IKEDA , Masashi SAKAMOTO , Yui ITO , Takuya TAKAYAMA
IPC分类号： B22D11/115 , B22D11/103
摘要： The device for controlling a flow in a mold in thin-slab casting of steel has a thickness on the short side of the meniscus portion of 150 mm or less and a casting width of 2 m or less and includes a DC magnetic field generation unit and an immersion nozzle having a slit formed at the bottom so that the slit leads to the bottom of the discharge hole and opens outside, the discharge hole and the slit are present in the DC magnetic field zone, and the magnetic flux density B (T) in the DC magnetic field zone and the distance L (m) from the lower end of the immersion nozzle to the lower end of the core satisfy Formulae (1) and (2) described below: 0.35T≤B≤1.0T Formula (1) L≥0.06 m Formula (2)
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公开(公告)号：US20240183015A1
公开(公告)日：2024-06-06
申请号：US18279370
申请日：2022-05-09
发明人： Yuri TODA , Daisuke MAEDA , Tamaki SUZUKI , Yuma ASADA , Takuya TAKAYAMA
CPC分类号： C22C38/38 , C21D9/46 , C22C38/02 , C22C38/06 , C21D2211/001 , C21D2211/002 , C21D2211/005
摘要： This steel sheet for hot stamping has a predetermined chemical composition and has a microstructure in which Sα+SGB, which is a total of an area ratio Sα of ferrite and an area ratio SGB of a granular bainite, is 10% or more and less than 50% and SGB/Sα, which is a ratio between the area ratio SGB of the granular bainite and the area ratio Sα of the ferrite, is 0.30 to 0.70. In addition, a hot-stamping formed body manufactured using this steel sheet for hot stamping has a predetermined chemical composition and a microstructure in which an average grain size of prior austenite grains is 5 to 25 μm, and a standard deviation of grain sizes of the prior austenite grains is 0.1 to 2.0 μm, and a tensile strength of the hot-stamping formed body is 2,200 MPa or more.
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4.发明申请公开(公告)号：US20220002829A1
公开(公告)日：2022-01-06
申请号：US17292984
申请日：2019-11-08
IPC分类号： C21D9/46 , C21D8/02 , C21D6/00 , C22C38/14 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , B22D11/128 , B21B1/46
摘要： Using an apparatus for manufacturing a thin steel sheet including the followings which are arranged in order: a continuous casting machine (1) for a thin slab having a slab thickness of 70 mm to 120 mm at a lower end of a mold; a holding furnace (2) that is configured to maintain a temperature of a cast slab (10) and/or heats the cast slab (10); and a rolling stand (3) by which finish rolling is performed, the casting speed of the thin slab is set to 4 to 7 m/min, the slab (10) is reduced at a rolling reduction of 30% or more by the reduction roll (4) after solidification is completed and when a center temperature of the slab is 1300° C. or higher, and the slab (10) is held at a temperature of 1150° C. or higher and 1300° C. or lower for five minutes or longer in the holding furnace (2).
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5.发明申请公开(公告)号：US20210220907A1
公开(公告)日：2021-07-22
申请号：US15734351
申请日：2019-06-07
发明人： Hiroshi HARADA , Kanoko YAMAMOTO , Takuya TAKAYAMA , Keita IKEDA , Yui ITO
IPC分类号： B22D11/115 , B22D11/12 , B22D41/50
摘要： A continuous casting facility used for thin slab casting has a mold for casting molten steel, an immersion nozzle that supplies the molten steel into the mold, and an electromagnetic stirring device capable of providing a swirl flow at a molten steel surface in the mold, and a thickness DCu (mm) of a copper plate of a long side wall, a thickness T (mm) of a steel piece, a frequency f (Hz) of the electromagnetic stirring device, electric conductivity σ (S/m) of the molten steel, and electric conductivity σCu (S/m) of the copper plate of the long side wall are adjusted to satisfy the following formulae (1)-a and (1)-b: DCu
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