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1. WO2020138343 - STEEL SHEET

Publication Number WO/2020/138343
Publication Date 02.07.2020
International Application No. PCT/JP2019/051252
International Filing Date 26.12.2019
IPC
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 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 38/60 2006.1
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
CPC
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 38/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
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
Y02P 10/20
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
10Technologies related to metal processing
20Recycling
Applicants
  • 日本製鉄株式会社 NIPPON STEEL CORPORATION [JP]/[JP]
Inventors
  • 林 宏太郎 HAYASHI, Koutarou
  • 筒井 和政 TSUTSUI, Kazumasa
  • 上西 朗弘 UENISHI, Akihiro
Agents
  • 青木 篤 AOKI, Atsushi
  • 三橋 真二 MITSUHASHI, Shinji
  • 福地 律生 FUKUCHI, Norio
  • 齋藤 学 SAITO, Manabu
Priority Data
2018-24565427.12.2018JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) STEEL SHEET
(FR) TÔLE D'ACIER
(JA) 鋼板
Abstract
(EN)
The present invention relates to a steel sheet containing, in terms of % by mass, more than 0.10 to 0.45% C, 0.001-2.50% Si, more than 4.00 to 8.00% Mn, and 0.001-1.50% sol. Al, the metal structure at a position 1/4 the thickness from the surface of the steel sheet including, in terms of area%, 25-90% tempered martensite and 10-50% residual austenite, and the standard deviation of the Mn concentration in a range of 20 µm in the rolling direction and 20 µm in the sheet thickness direction at a position 1/4 the thickness from the surface of the steel sheet being at least 0.30% by mass.
(FR)
La présente invention concerne une tôle d'acier contenant, en % en masse, plus de 0,10 à 0,45 % de C, de 0,001 à 2,50 % de Si, plus de 4,00 à 8,00 % de Mn et de 0,001 à 1,50 % d'Al en sol., la structure métallique à une position au 1/4 de l'épaisseur à partir de la surface de la tôle d'acier comprenant, en termes de % de surface, de 25 à 90 % de martensite revenue et de 10 à 50 % d'austénite résiduelle et l'écart-type de la concentration en Mn dans une plage de 20 µm dans la direction de laminage et de 20 µm dans la direction de l'épaisseur de la tôle à une position au 1/4 de l'épaisseur à partir de la surface de la tôle d'acier étant d'au moins 0,30 % en masse.
(JA)
本発明は、質量%で、C:0.10超~0.45%、Si:0.001~2.50%、Mn:4.00超~8.00%、sol.Al:0.001~1.50%を含有し、表面から厚みの1/4位置における金属組織が、面積%で、焼き戻しマルテンサイト:25~90%、及び残留オーステナイト:10~50%を含み、表面から厚みの1/4位置において、圧延方向20μm及び板厚方法20μmの範囲におけるMn濃度の標準偏差が0.30質量%以上である鋼板に関する。
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