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1. WO2020209276 - STEEL SHEET AND METHOD FOR PRODUCING SAME

Publication Number WO/2020/209276
Publication Date 15.10.2020
International Application No. PCT/JP2020/015768
International Filing Date 08.04.2020
IPC
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
C22C 38/00 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/06 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
06containing aluminium
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
B22D 11/124 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
11Continuous casting of metals, i.e. casting in indefinite lengths
12Accessories for subsequent treating or working cast stock in situ
124for cooling
Applicants
  • 日本製鉄株式会社 NIPPON STEEL CORPORATION [JP]/[JP]
Inventors
  • 佐野 幸一 SANO Kohichi
  • 川田 裕之 KAWATA Hiroyuki
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
2019-07569311.04.2019JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) STEEL SHEET AND METHOD FOR PRODUCING SAME
(FR) TÔLE D'ACIER ET PROCÉDÉ DE PRODUCTION ASSOCIÉ
(JA) 鋼板及びその製造方法
Abstract
(EN)
This steel sheet has a prescribed chemical composition and contains at least ferrite and retained austenite and/or martensite in a microstructure. Furthermore, in a face parallel to a rolled face, the average distance between the centers of adjacent high-Mn regions is 1.00 mm or less, and the density DA of a high-Mn region in the central part in the sheet width direction and the density DB of a high-Mn region at a position corresponding to 1/4 of the distance from an edge in the sheet width direction satisfy the relationship 0.77 ≤ DA/DB ≤ 1.30. The ratio of the average hardness of a high-Mn region relative to the average hardness of a low-Mn region is 1.1-2.0. The difference between the average upper 5% and the average lower 5% of Mn content in low-Mn regions is 0.3% or more.
(FR)
L'invention concerne une tôle d'acier présentant une composition chimique déterminée et contenant au moins de la ferrite et de l'austénite et/ou de la martensite retenues dans une microstructure. En outre, sur une face parallèle à une face laminée, la distance moyenne entre les centres de zones à haute teneur en Mn adjacentes est de 1,00 mm ou inférieure, et la densité DA d'une zone à haute teneur en Mn dans la partie centrale dans le sens de la largeur de la tôle et la densité DB d'une zone à haute teneur en Mn à un emplacement correspondant à 1/4 de la distance à partir d'un bord dans le sens de la largeur de la tôle satisfont à la relation 0,77 ≤ DA/DB ≤ 1,30. Le rapport entre la dureté moyenne d'une zone à teneur élevée en Mn et la dureté moyenne d'une zone à faible teneur en Mn est de 1,1 à 2,0. La différence entre la limite supérieure moyenne de 5 % et la limite inférieure moyenne de 5 % de la teneur en Mn dans des zones à faible teneur en Mn est de 0,3 % ou supérieure.
(JA)
本発明の鋼板は、所定の化学組成を有すると共に、ミクロ組織に、フェライト、並びに残留オーステナイト及び/又はマルテンサイトを少なくとも含有する鋼板であって、更に、圧延面に平行な面において、隣合う高Mn領域の中心同士の平均距離が1.00mm以下であり、板幅中央部の高Mn領域の密度Dと、板幅端部から1/4の位置の高Mn領域の密度Dとが、0.77≦D/D≦1.30 との関係を満たし、高Mn領域の硬さの平均の、低Mn領域の硬さの平均に対する比が1.1~2.0であり、低Mn領域におけるMn含有量の上位5%の平均と下位5%の平均との差を0.3%以上とする鋼板である。
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