Title:
THICK STEEL PLATE AND MANUFACTURING METHOD THEREOF
Document Type and Number:
Japanese Patent JP2023128435
Kind Code:
A
Abstract:
To provide a thick steel plate which suppresses or prevents occurrence of burning upon laser cutting, and therefore, is useful for application of laser cutting, and to provide a manufacturing method of the thick steel plate.SOLUTION: A thick steel plate includes a steel plate and a scale. Therein, two-dimensional arithmetic average roughness of scale surface and scale/steel plate interface are each 5.0 μm or less, and kurtosis of ruggedness of the interface is 2.50 or more. A manufacturing method of the thick steel plate includes a process in which a slab is heated up to 1050 to 1300°C and a time up to heating process completion after exceeding 1050°C satisfies predetermined conditions, a process in which rolling is performed at a cumulation of 15% or more in a predetermined temperature range, high-pressure water descaling is performed in a predetermined temperature range, rolling is performed at a rolling reduction rate of 5% or more by using a rolling roll of arithmetic average roughness of 1.00 μm or less within 30 s and, further, rolling is performed at a rolling reduction rate of 3 to 15% by using the rolling roll of arithmetic average roughness of 1.00 μm or less, and a cooling process in predetermined conditions.SELECTED DRAWING: None
Inventors:
KAWADA HIROYUKI
TANEI HIROSHI
HARANO TAKAYUKI
SAKAI TATSUHIKO
HONMA RYUICHI
SHIRAHATA HIROYUKI
TANEI HIROSHI
HARANO TAKAYUKI
SAKAI TATSUHIKO
HONMA RYUICHI
SHIRAHATA HIROYUKI
Application Number:
JP2022032777A
Publication Date:
September 14, 2023
Filing Date:
March 03, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
B21B45/00; B21B1/38; B21B45/08; C21D8/02; C21D9/00; C22C38/00; C22C38/60; C23C26/00
Attorney, Agent or Firm:
Atsushi Aoki
Shinji Mihashi
Ritsuo Fukuchi
Manabu Saito
Kenji Kimura
Shinji Mihashi
Ritsuo Fukuchi
Manabu Saito
Kenji Kimura