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1. WO2020136829 - NICKEL-CONTAINING STEEL SHEET

Publication Number WO/2020/136829
Publication Date 02.07.2020
International Application No. PCT/JP2018/048244
International Filing Date 27.12.2018
IPC
C22C 38/00 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/54 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
54with boron
C21D 8/02 2006.1
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
CPC
C21D 1/18
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
18Hardening
C21D 6/00
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
6Heat treatment of ferrous alloys
C21D 6/001
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
6Heat treatment of ferrous alloys
001containing Ni
C21D 8/02
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
C21D 8/0205
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
0205of ferrous alloys
C21D 8/0226
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
0221characterised by the working steps
0226Hot rolling
Applicants
  • 日本製鉄株式会社 NIPPON STEEL CORPORATION [JP]/[JP]
Inventors
  • 古谷 仁志 FURUYA Hitoshi
  • 渡邉 健太郎 WATANABE Kentaro
  • 森 敬祐 MORI Keisuke
  • 浅羽 正和 ASABA Masakazu
  • 末松 芳章 SUEMATSU Yoshiaki
Agents
  • 棚井 澄雄 TANAI Sumio
  • 寺本 光生 TERAMOTO Mitsuo
  • 勝俣 智夫 KATSUMATA Tomoo
  • 山口 洋 YAMAGUCHI Yoh
Priority Data
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) NICKEL-CONTAINING STEEL SHEET
(FR) TÔLE D'ACIER CONTENANT DU NICKEL
(JA) ニッケル含有鋼板
Abstract
(EN)
A nickel-containing steel sheet according to one aspect of the present invention has a chemical composition falling within a specified range, also having an average coarse grain diameter of prior austenite of 20 μm or less and tensile strength of 690 to 900 MPa, wherein the average coarse grain diameter of prior austenite is defined as a simple average value of largest equivalent circle diameters of the prior austenite grains respectively in 10 viewing fields each having an area of 200 μm2 as measured on a plane formed by each of the rolling direction of the steel sheet and the thickness direction of the steel sheet at a position corresponding to the depth of 1/4t of the steel sheet.
(FR)
Une tôle d'acier contenant du nickel selon un aspect de la présente invention a une composition chimique s'inscrivant dans une plage spécifiée, présentant également un diamètre de grain grossier moyen d'austénite antérieure inférieur ou égal à 20 µm et une résistance à la traction de 690 à 900 MPa, le diamètre de grain grossier moyen de l'austénite antérieure étant défini comme étant une valeur moyenne simple des diamètres de cercles équivalents les plus grands des grains d'austénite antérieure respectivement dans 10 champs de visualisation ayant chacun une surface de 200 μm2 telle que mesurée sur un plan formé par chacune des directions de laminage de la tôle d'acier et la direction d'épaisseur de la tôle d'acier à une position correspondant à la profondeur de 1/4t de la tôle d'acier.
(JA)
本発明の一態様に係るニッケル含有鋼板は、化学組成が所定範囲内であり、鋼板の1/4t位置における前記鋼板の圧延方向及び前記鋼板の厚さ方向がなす面において測定される、面積200μmの10視野それぞれにおける旧オーステナイト粒の円相当径の最大値の単純平均値として定義される、旧オーステナイトの平均粗大粒径が20μm以下であり、引張強さが690~900MPaである。
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