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公开(公告)号：US20250034691A1
公开(公告)日：2025-01-30
申请号：US18716260
申请日：2022-10-11
Applicant: JFE STEEL CORPORATION
Inventor： Yu ITO , Hideyuki TAKAHASHI , Kenji YAMASHIRO , Takumi KOYAMA , Yoshihiko KAKU
Abstract: A gas wiping nozzle and a method for manufacturing a hot-dip metal-coated steel strip using the gas wiping nozzle. The gas wiping nozzle adjusts the coating weight of a molten metal on the surface of a steel strip pulled up from a molten metal bath. At least the surface of the gas wiping nozzle is made of a ceramic, and the arithmetic mean roughness Ra and the peak count PPI of the gas wiping nozzle satisfy Formula (1): PPI > c 1 × Ra + c 2 ( 1 ) PPI: peak count (the number of peaks per inch) Ra: arithmetic mean roughness [μm] c1 and c2: determined constants for each ceramic used in the surface of the gas wiping nozzle.
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公开(公告)号：US20230212728A1
公开(公告)日：2023-07-06
申请号：US18008487
申请日：2021-04-21
Applicant: JFE STEEL CORPORATION
Inventor： Kenji YAMASHIRO , Hideyuki TAKAHASHI , Takumi KOYAMA , Hidetoshi INOUE , Syuhei NISHINAKA , Toshiki FUJII , Reona AISHIMA , Yutaka YANAGISAWA , Masahiro YOSHIKAWA
Abstract: A gas wiping nozzle manufactured from parts divided along the slit length direction and maintains a gap in the width direction over the length direction in high temperature atmospheres and a method for manufacturing a hot-dip metal strip. In a gas wiping nozzle, a first and a second nozzle member are each divided along the length direction X of a slit into a plurality of nozzle members. The dimension of a divided face of the first nozzle member is 1.5T1 or more in a section of the first nozzle member where T1 is the thickness of the first nozzle member in the width direction Z of the slit, and the dimension of a divided face of the second nozzle member is 1.5T2 or more in a section of the second nozzle member where T2 is the thickness of the second nozzle member in the width direction Z of the slit.
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