Title:
THICK STEEL PLATE AND METHOD FOR MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JP2023128403
Kind Code:
A
Abstract:
To provide a thick steel plate in which occurrence of burning in laser cutting is suppressed or prevented, and therefore, which is useful for application of laser cutting, and a method for manufacture of the same.SOLUTION: Provided is a thick steel plate which contains a steel plate and scale, and in which the scale has, in order from a surface thereof, a first layer comprising hematite, a second layer comprising magnetite, and a third layer comprising wustite or comprising wustite and an eutectoid structure of ferrite and magnetite. An average thickness of the first layer is 0.5 to 5.0 μm, a surface coverage of the steel plate with the first layer is 50% or more, an average thickness of the second layer is 10 to 40%, an average thickness of the third layer is 50% or more of a scale thickness, a deviation of third layer thickness in a plate width direction is 0.40 or less, and an average particle diameter of wustite in the third layer is 15 μm or less. Further, a method for manufacture of the thick steel plate is provided.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:
JP2022032731A
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