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1. WO2020136990 - HIGH-STRENGTH HOT-DIP ZINC-COATED STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Publication Number WO/2020/136990
Publication Date 02.07.2020
International Application No. PCT/JP2019/033082
International Filing Date 23.08.2019
IPC
C22C 38/14 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
14containing titanium or zirconium
C22C 38/60 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
60containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
C21D 8/02 2006.01
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
C21D 9/46 2006.01
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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
CPC
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 9/46
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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
C22C 38/14
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
14containing titanium or zirconium
C22C 38/60
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
60containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Applicants
  • JFEスチール株式会社 JFE STEEL CORPORATION [JP]/[JP]
Inventors
  • 長谷川 寛 HASEGAWA Hiroshi
  • 中垣内 達也 NAKAGAITO Tatsuya
  • 竹田 裕紀 TAKEDA Yuki
Agents
  • 熊坂 晃 KUMASAKA Akira
  • 森 和弘 MORI Kazuhiro
  • 磯村 哲朗 ISOMURA Tetsuo
  • 坂井 哲也 SAKAI Tetsuya
Priority Data
2018-24271226.12.2018JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) HIGH-STRENGTH HOT-DIP ZINC-COATED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
(FR) TÔLE EN ACIER GALVANISÉ À CHAUD HAUTEMENT RÉSISTANTE, ET PROCÉDÉ DE FABRICATION DE CELLE-CI
(JA) 高強度溶融亜鉛めっき鋼板およびその製造方法
Abstract
(EN)
Provided are: a high-strength hot-dip zinc-coated steel sheet having high strength and excellent delayed fracture resistance properties; and a method for manufacturing the high-strength hot-dip zinc-coated steel sheet. A high-strength hot-dip zinc-coated steel sheet having a specified component composition and also having such a steel structure that the total content of martensite and bainite containing a carbide is 60 to 100% by area in a region extending to the depth of 300 to 400 μm from the surface layer of the steel sheet as observed in the sheet thickness direction, the average grain diameter of prior austenite is 15 μm or less, and the ratio of the height of a peak of an Auger electron spectrum of P at a position 5 nm or more away from a prior austenite grain boundary to that at the prior austenite grain boundary in the region extending to the depth of 300 to 400 μm from the surface layer of the steel sheet as observed in the sheet thickness direction is 0.20 or more, wherein a hot-dip zinc coating layer is arranged on the surface of the steel sheet.
(FR)
L'invention fournit une tôle en acier galvanisé à chaud hautement résistante qui présente une haute résistance et qui se révèle excellente en termes de caractéristiques de résistance à la rupture différée, et fournit également un procédé de fabrication de celle-ci. Plus précisément, l'invention concerne une tôle en acier galvanisé à chaud hautement résistante qui possède une composition spécifique, et une structure d'acier telle que dans une étendue de 300 à 400μm dans la direction épaisseur depuis une couche superficielle de tôle en acier, en rapport surfacique, le total d'une bainite contenant une martensite et un carbure représente 60 à 100%, le diamètre de grain moyen d'une austénite primaire est inférieur ou égal à 15μm, et le rapport d'une hauteur de pic d'un spectre d'électrons Auger d'un P en une position éloignée de 5nm ou plus d'un joint de grains d'une austénite primaire vis-à-vis d'une hauteur de pic d'un spectre d'électrons Auger d'un P au joint de grains de l'austénite primaire, est supérieur ou égal à 20. Enfin, une couche de galvanisation à chaud est présente à la surface de la tôle en acier.
(JA)
高強度であって耐遅れ破壊特性に優れる高強度溶融亜鉛めっき鋼板およびその製造方法を提供する。 高強度溶融亜鉛めっき鋼板であって、特定の成分組成と、鋼板表層から板厚方向に300~400μmの範囲において、面積率で、マルテンサイトと炭化物を含むベイナイトの合計が60~100%であり、旧オーステナイトの平均粒径が15μm以下であり、鋼板表層から板厚方向に300~400μmの範囲において、旧オーステナイト粒界におけるPのオージェ電子スペクトルのピーク高さに対する旧オーステナイト粒界から5nm以上離れた位置におけるPのオージェ電子スペクトルのピーク高さの比が0.20以上である鋼組織と、を有し、鋼板表面に溶融亜鉛めっき層を有する。
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