THICK STEEL PLATE AND METHOD FOR MANUFACTURING THE SAME

Japanese Patent JP2023128419

A

To provide a thick steel plate which enhances adhesion of a scale, suppresses or prevents scale peeling at the time of laser irradiation, and accordingly is useful for applying laser cutting, and a method for manufacturing the same.SOLUTION: A thick steel plate includes a steel plate, and a scale formed on the surface of the steel plate, wherein a density of a CuNi-concentrated part existing in an island state on the interface between the steel plate and the scale is 1.0×107 pieces/m2 or more, and thickness deviation of the scale is 10.0% or less of an average thickness of the scale. A method for manufacturing a thick steel plate includes the steps of: applying bending work with the amount of strain on the surface of a slab of 20-40% at a surface temperature of the slab in continuous casting of 1,000-1,200°C; heating the slab at a predetermined highest heating temperature in predetermined time; rolling the slab at a cumulative draft of 15% or more, then subjecting the slab to descaling by high-pressure water, setting temperature deviation in a width direction of a rolled material at 25°C or lower, and then applying additional hot-rolling; and cooling the steel plate under a predetermined condition.SELECTED DRAWING: None

JPS61202755	METHOD, INSTALLATION AND COVER FOR HEAT INSULATION OF SLAB
JPS5832505	WORKING METHOD FOR METALLIC LITHIUM
JPH03211233	HEATING FURNACE

KAWADA HIROYUKI
TANEI HIROSHI
HARANO TAKAYUKI
SAKAI TATSUHIKO
HONMA RYUICHI
SHIRAHATA HIROYUKI

JP2022032757A

September 14, 2023

March 03, 2022

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NIPPON STEEL CORP

B21B45/00; B21B1/38; B21B45/08; C21D8/02; C21D9/00; C22C38/00; C22C38/60; C23C26/00

Atsushi Aoki
Shinji Mihashi
Ritsuo Fukuchi
Manabu Saito
Kenji Kimura

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