公开(公告)号：EP4265751A1

公开(公告)日：2023-10-25

申请号：EP21921165.3

申请日：2021-10-22

申请人： JFE Steel Corporation

发明人： SATO, Rinta ,  MIZUNO, Daisuke ,  TANAKA, Minoru ,  NISHIIKE, Ryoto

IPC分类号： C21D9/00 ,  B21B3/00 ,  C21D1/18 ,  C21D9/46 ,  C22C18/00 ,  C22C18/04 ,  C22C21/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/60 ,  C23C2/06 ,  C23C2/12 ,  C23C28/00

摘要： Objects are to provide a hot-pressed member and a coated member that have excellent post-coating image clarity and post-coating corrosion resistance and to provide methods for manufacturing the same. Another object is to provide a steel sheet for hot pressing suitable for hot-pressed members having excellent post-coating image clarity and post-coating corrosion resistance.
A hot-pressed member including at least one surface that has a filtered centerline waviness Wca of less than or equal to 1.5 um.

公开(公告)号：EP4442852A1

公开(公告)日：2024-10-09

申请号：EP23770064.6

申请日：2023-01-05

申请人： JFE Steel Corporation

发明人： SATO, Rinta ,  MAKIMIZU, Yoichi ,  NISHIIKE, Ryoto ,  TANAKA, Minoru

IPC分类号： C23C2/12 ,  B21D22/20

CPC分类号： B21D22/20 ,  C23C2/12

摘要： Provided is a hot pressed member with excellent post-painting corrosion resistance and excellent corrosion resistance at lapped part. The hot pressed member includes: a steel material; an Al-Fe-based intermetallic compound layer with a thickness of 10 µm to 30 µm disposed on at least one side of the steel material; and Mg-containing oxide particles disposed on the Al-Fe-based intermetallic compound layer, wherein the Mg-containing oxide particles have an average particle size of 5.0 µm or less and a number density of 1000 particles/mm2 or more.

公开(公告)号：EP4206363A1

公开(公告)日：2023-07-05

申请号：EP21885603.7

申请日：2021-06-29

申请人： JFE Steel Corporation

发明人： SATO, Rinta ,  TANAKA, Minoru ,  MIZUNO, Daisuke ,  NISHIIKE, Ryoto

IPC分类号： C25D5/26 ,  B21D22/20 ,  B23K11/00 ,  C21D1/18 ,  C21D9/00 ,  C22C38/00 ,  C22C38/06 ,  C22C38/60 ,  C23C2/06 ,  C23C2/18 ,  C23C2/40

摘要： Objects are to provide a hot-pressed member having excellent post-coating corrosion resistance and excellent resistance spot weldability and to provide a method for manufacturing the hot-pressed member. Another object is to provide a steel sheet for hot pressing suitable for a hot-pressed member having excellent post-coating corrosion resistance and excellent resistance spot weldability.
A hot-pressed member includes a Zn-based coated layer on a first side of a steel sheet; and a Zn-based coated layer on a second side of the steel sheet. A coating weight of Zn in the Zn-based coated layer on the first side of the steel sheet is 5 to 35 g/m 2 , and an average line roughness Ra of a surface of the Zn-based coated layer on the first side is less than or equal to 2.5 um. The average line roughness Ra of a surface of the Zn-based coated layer on the second side of the steel sheet is greater than or equal to 3.5 um.