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1. WO2013047760 - HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT DELAYED FRACTURE RESISTANCE, AND METHOD FOR PRODUCING SAME

Publication Number WO/2013/047760
Publication Date 04.04.2013
International Application No. PCT/JP2012/075108
International Filing Date 28.09.2012
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
B21B 1/26 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
BROLLING OF METAL
1Metal rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
22for rolling bands or sheets of indefinite length
24in a continuous process
26by hot-rolling
B21B 3/00 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
BROLLING OF METAL
3Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences
C21D 9/46 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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
C22C 18/04 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
18Alloys based on zinc
04with aluminium as the next major constituent
C22C 38/06 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
06containing aluminium
CPC
B21B 1/26
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
BROLLING OF METAL
1Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section
22for rolling ; plates, strips,; bands or sheets of indefinite length
24in a continuous ; or semi-continuous; process
26by hot-rolling ; , e.g. Steckel hot mill
B21B 3/00
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
BROLLING OF METAL
3Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
B32B 15/013
BPERFORMING OPERATIONS; TRANSPORTING
32LAYERED PRODUCTS
BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
15Layered products comprising ; a layer of; metal
01all layers being exclusively metallic
013one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
C21D 2211/005
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
2211Microstructure comprising significant phases
005Ferrite
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 8/1222
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
12during manufacturing of articles with special electromagnetic properties
1216the working step(s) being of interest
1222Hot rolling
Applicants
  • 新日鐵住金株式会社 NIPPON STEEL & SUMITOMO METAL CORPORATION [JP]/[JP]
Inventors
  • 川田 裕之 KAWATA, Hiroyuki
  • 丸山 直紀 MARUYAMA, Naoki
  • 村里 映信 MURASATO, Akinobu
  • 南 昭暢 MINAMI, Akinobu
  • 安井 健志 YASUI, Takeshi
  • 桑山 卓也 KUWAYAMA, Takuya
  • 伴 博之 BAN, Hiroyuki
  • 平松 薫 HIRAMATSU, Kaoru
Agents
  • 國分 孝悦 KOKUBUN, Takayoshi
Priority Data
2011-21877630.09.2011JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT DELAYED FRACTURE RESISTANCE, AND METHOD FOR PRODUCING SAME
(FR) FEUILLE D'ACIER GALVANISÉ PAR IMMERSION À CHAUD ET À HAUTE RÉSISTANCE QUI PRÉSENTE UNE EXCELLENTE RÉSISTANCE À LA RUPTURE DIFFÉRÉE ET PROCÉDÉ DE PRODUCTION CORRESPONDANT
(JA) 耐遅れ破壊特性に優れた高強度溶融亜鉛めっき鋼板およびその製造方法
Abstract
(EN) A hot-dip zinc plating layer or an alloyed hot-dip zinc plating layer is formed on the surface of a base steel sheet comprising, in terms of volume fractions, 40 to 90% of a ferrite phase, and not more than 5% of a retained austenite phase, and the proportion of non-recrystallized ferrite with respect to the total ferrite phase is not more than 50% in terms of volume fraction. Furthermore, the particle size ratio of crystal grains in the ferrite phase, which is obtained by dividing the average particle size in the rolling direction by the average particle size in the sheet width direction is 0.75 to 1.33; the length ratio of hard structures dispersed in island shapes, which is obtained by dividing the average length in the rolling direction by the average length in the sheet width direction, is 0.75 to 1.33; and the average aspect ratio of inclusions is not more than 5.0.
(FR) La présente invention se rapporte à une couche de zingage par immersion à chaud ou à une couche de zingage par immersion à chaud alliée qui est formée sur la surface d'une feuille d'acier de base comprenant, en termes de fractions volumiques, 40 à 90 % d'une phase de ferrite, et une quantité inférieure ou égale à 5 % d'une phase d'austénite retenue et la proportion de la ferrite non recristallisée par rapport à la phase de ferrite totale est inférieure ou égale à 50 % en termes de fraction volumique. En outre, le rapport de la taille particulaire des grains cristallins dans la phase de ferrite, qui est obtenu par division de la taille particulaire moyenne dans la direction de laminage par la taille particulaire moyenne dans le sens de la largeur de la feuille va de 0,75 à 1,33 ; le rapport de longueur des structures dures dispersées sous forme d'îlots, qui est obtenu par division de la longueur moyenne dans la direction de laminage par la longueur moyenne dans le sens de la largeur de la feuille va de 0,75 à 1,33 ; et le rapport d'aspect moyen des inclusions est inférieur ou égal à 5,0.
(JA)  体積分率で、40~90%のフェライト相と、5%以下の残留オーステナイト相とを有するとともに、フェライト相全体に占める未再結晶フェライトの割合が体積分率で50%以下であり、さらにフェライト相の結晶粒の圧延方向における平均粒径を、板幅方向における平均粒径で除した値である粒径比が0.75~1.33、島状に分散する硬質組織の圧延方向における平均長さを、板幅方向における平均長さで除した値である長さ比が0.75~1.33、介在物の平均アスペクト比が5.0以下である母材鋼板の表面に溶融亜鉛めっき層もしくは合金化溶融亜鉛めっき層を形成する。
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