公开(公告)号：US10822683B2

公开(公告)日：2020-11-03

申请号：US15521535

申请日：2015-11-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyuki Kawata ,  Takeshi Yasui ,  Kohei Ueda ,  Naoki Maruyama ,  Yuji Yamaguchi ,  Satoshi Uchida ,  Ryosuke Komami ,  Hayato Arai ,  Toyomitsu Nakamura

IPC: B32B15/01 ,  C23C2/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/08 ,  C22C38/18 ,  C21D9/46 ,  C21D8/02 ,  C22C38/58 ,  C23C2/02 ,  C23C2/28 ,  C22C38/16

Abstract: A hot-dip galvanized steel sheet includes a base steel sheet and a hot-dip galvanized layer formed on at least one surface of the base steel sheet, in which the hot-dip galvanized layer includes Fe in a content of more than 0% to 5% or less, Al in a content of more than 0% to 1.0% or less, and columnar grains formed by a ζ phase on the surface of the steel sheet, further, 20% or more of the entire interface between the hot-dip galvanized layer and the base steel sheet is coated with the ζ phase, and a ratio of an interface formed between ζ grains in which coarse oxides are present among grains and the base steel sheet with respect to the entire interface between the ζ phase and the base steel sheet in the hot-dip galvanized layer is 50% or less, the base steel sheet has predetermined chemical components and a refined layer in direct contact with the interface between the base steel sheet and the hot-dip galvanized layer, an average thickness of the refined layer is 0.1 to 5.0 μm, an average grain size of ferrite in the refined layer is 0.1 to 3.0 μm, one or two or more of oxides of Si and Mn are contained in the refined layer, and a maximum size of the oxide is 0.01 to 0.4 μm, and a volume fraction of residual austenite in a range of ⅛ thickness to ⅜ thickness centered at a position of ¼ thickness from the surface of the base steel sheet is 1% or more.

公开(公告)号：US10507629B2

公开(公告)日：2019-12-17

申请号：US15522409

申请日：2015-11-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyuki Kawata ,  Takeshi Yasui ,  Kohei Ueda ,  Naoki Maruyama ,  Yuji Yamaguchi ,  Satoshi Uchida ,  Ryosuke Komami ,  Hayato Arai ,  Yasuhiro Nakashima ,  Toyomitsu Nakamura

IPC: B32B15/01 ,  C23C2/06 ,  C23C2/40 ,  C21D9/46 ,  C22C38/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18

Abstract: A hot-dip galvanized steel sheet wherein the hot-dip galvanized steel sheet comprises a base steel sheet and a hot-dip galvanized layer, a ferrite phase is, by volume fraction, 40% or more and 97% or less in a range of ⅛ thickness to ⅜ thickness centered at a position of ¼ thickness from the surface of the base steel sheet, a hard structure is 3% or more in total, wherein the hot-dip galvanized steel sheet has the hot-dip galvanized layer in which Fe is 5.0% or less and Al is 1.0% or less, and columnar grains formed of a ζ phase is 20% or more in an entire interface between the plated layer and the base steel sheet on the surface of the base steel sheet in which a ratio of a volume fraction of the hard structure in a surface layer range of 20 μm depth in a steel sheet direction from an interface between the hot-dip galvanized layer and the base steel sheet is 0.10 times or more to 0.90 times or less of a volume fraction of the hard structure in the range of ⅛ thickness to ⅜ thickness, and wherein the hot-dip galvanized steel sheet has a refined layer at the side of the interface in the base steel sheet, and wherein an average thickness of the refined layer, an average grain size of ferrite in the refined layer and a maximum size of the oxide included in the refined layer are defined respectively.

公开(公告)号：US10822684B2

公开(公告)日：2020-11-03

申请号：US15522243

申请日：2015-11-05

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyuki Kawata ,  Takeshi Yasui ,  Kohei Ueda ,  Naoki Maruyama ,  Yuji Yamaguchi ,  Satoshi Uchida ,  Ryosuke Komami ,  Hayato Arai ,  Toyomitsu Nakamura

IPC: B32B15/01 ,  C23C2/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/18 ,  C21D9/46 ,  C21D8/02 ,  C22C38/58 ,  C23C2/02 ,  C23C2/28 ,  C22C38/16

Abstract: A hot-dip galvanized steel sheet includes a base steel sheet and a hot-dip galvanized layer formed on at least one surface of the base steel sheet, in which the hot-dip galvanized layer includes Fe in a content of more than 0% to 5% or less, Al in a content of more than 0% to 1.0% or less, and columnar grains formed by a ζ phase on the surface of the steel sheet, further, 20% or more of the entire interface between the hot-dip galvanized layer and the base steel sheet is coated with the ζ phase, and a ratio of an interface formed between ζ grains in which coarse oxides are present among ζ grains and the base steel sheet with respect to the entire interface between the ζ phase and the base steel sheet in the hot-dip galvanized layer is 50% or less, the base steel sheet has predetermined chemical components and a refined layer in direct contact with the interface between the base steel sheet and the hot-dip galvanized layer, an average thickness of the refined layer is 0.1 to 5.0 μm, an average grain size of ferrite in the refined layer is 0.1 to 3.0 μm, one or two or more of oxides of Si and Mn are contained in the refined layer, and a maximum size of the oxide is 0.01 to 0.4 μm.

公开(公告)号：US20140193665A1

公开(公告)日：2014-07-10

申请号：US14235155

申请日：2012-07-27

Applicant: NIPPON STEEL CORPORATION

Inventor： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui

IPC: C23C2/28 ,  B32B15/01

CPC classification number: C23C2/28 ,  B32B15/013 ,  C21D8/041 ,  C21D8/0473 ,  C21D8/0484 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C18/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/06 ,  Y10T428/12611 ,  Y10T428/12618 ,  Y10T428/12799

Abstract: Provided are: a galvannealed steel sheet, reliably and sufficiently improved in the adhesiveness of a plated layer with a base steel sheet, as a galvannealed steel sheet, prepared by using a high-strength steel sheet as a base material; and a method for producing the galvannealed steel sheet.The galvannealed steel sheet wherein a galvannealed layer is formed on a base steel sheet including a high-strength steel having predetermined component composition; the average amount of Fe in the galvannealed layer is in a range of 8.0 to 12.0%; and the absolute value ΔFe of a difference between the amount of Fe in the vicinity of an interface with the base steel sheet (the amount of Fe in the vicinity of an internal side) and the amount of Fe in the vicinity of the external surface of the plated layer (the amount of Fe in the vicinity of an external side) in the plated layer is in a range of 0.0 to 3.0%. Further, in a method for producing the galvannealed steel sheet, intra-plated-layer diffusion treatment for flattening the concentration gradient of Fe in the plated layer is performed after finishing hot dip galvanizing and alloying treatment.

Abstract translation: 提供：通过使用高强度钢板作为基材制备的合金化热浸镀锌钢板，其可靠且充分地提高镀层与基材钢板的粘合性，作为合金化热浸镀锌钢板; 以及合金化热浸镀锌钢板的制造方法。 合金化热浸镀锌钢板，其中合金化热浸镀层形成在包括具有预定组分组成的高强度钢的基础钢板上; 合金化热浸镀层中的平均Fe量在8.0〜12.0％的范围内。 和与基体钢板的界面附近的Fe量（内侧附近的Fe量）与外部附近的Fe量之差的绝对值＆Dgr; Fe 镀层的表面（外侧附近的Fe的量）在0.0〜3.0％的范围内。 此外，在合金化热浸镀锌钢板的制造方法中，在进行热浸镀锌和合金化处理后，进行用于使镀层中的Fe的浓度梯度平坦化的镀层间扩散处理。