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1. WO2016190396 - STEEL SHEET AND METHOD FOR PRODUCING SAME

Publication Number WO/2016/190396
Publication Date 01.12.2016
International Application No. PCT/JP2016/065629
International Filing Date 26.05.2016
IPC
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
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 38/60 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
CPC
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 2211/009
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
009Pearlite
C21D 6/002
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
002containing Cr
C21D 6/005
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
6Heat treatment of ferrous alloys
005containing Mn
C21D 6/008
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
008containing Si
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
Applicants
  • 新日鐵住金株式会社 NIPPON STEEL & SUMITOMO METAL CORPORATION [JP]/[JP]
Inventors
  • 高田 健 TAKATA, Ken
  • 匹田 和夫 HIKIDA, Kazuo
  • 竹田 健悟 TAKEDA, Kengo
  • 橋本 元仙 HASHIMOTO, Motonori
Agents
  • 青木 篤 AOKI, Atsushi
Priority Data
2015-10675526.05.2015JP
2015-18988328.09.2015JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) STEEL SHEET AND METHOD FOR PRODUCING SAME
(FR) TÔLE D'ACIER ET SON PROCÉDÉ DE PRODUCTION
(JA) 鋼板及びその製造方法
Abstract
(EN)
This steel sheet has improved hardenability and material moldability, and has a predetermined component composition. The metal structure of the steel sheet satisfies the following conditions: the average particle size of carbides is 0.4 µm to 2.0 µm; the area ratio of perlite is 6% or less; B/A > 1 wherein A is the number of carbide particles in ferrite grains and B is the number of carbide particles at ferrite grain boundaries; and I1/I0 < 1 wherein I1 is the X-ray diffraction intensity of the {211}<011> orientation on a surface at a depth of 1/2 the thickness of the steel sheet and I1 is the X-ray diffraction intensity of the {100}<011> orientation. The steel sheet has a Vickers hardness of 100 HV to 150 HV.
(FR)
La présente invention concerne une tôle d'acier présentant une meilleure aptitude au moulage et une meilleure aptitude au durcissement et possédant une composition de composants prédéfinie. La structure métallique de la tôle d'acier satisfait aux conditions suivantes : la taille de particules moyenne des carbures est de 0,4 µm à 2,0 µm ; le rapport de surface de la perlite est inférieur ou égal à 6 % ; B/A > 1, A étant le nombre de particules de carbure dans les grains de ferrite et B étant le nombre de particules de carbure aux limites des grains de ferrite ; et I1/I0 < 1, I1 étant l'intensité de diffraction des rayons X de l'orientation {211}<011> sur une surface à une profondeur de la moitié de l'épaisseur de la tôle d'acier et I1 étant l'intensité de diffraction des rayons X de l'orientation {100}<011>. La tôle d'acier présente une dureté Vickers de 100 HV à 150 HV.
(JA)
焼入れ性と素材成形性を向上させた鋼板であって、所定の成分組成を有し、鋼板の金属組織が、炭化物の平均粒径が0.4μm以上、2.0μm以下、パーライトの面積率が6%以下、フェライト粒内の炭化物の個数をA、フェライト粒界の炭化物の個数をBとしたとき、B/A>1、及び上記鋼板の1/2板厚部分の板面における{211}<011>のX線回折強度をI1、{100}<011>のX線回折強度をI0としたときI1/I0<1を満たし、鋼板のビッカース硬さが100HV以上150HV以下であることを特徴とする。
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