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1. WO2019044971 - STEEL SHEET FOR CARBURIZING, AND PRODUCTION METHOD FOR STEEL SHEET FOR CARBURIZING

Publication Number WO/2019/044971
Publication Date 07.03.2019
International Application No. PCT/JP2018/032112
International Filing Date 30.08.2018
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 1/06 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
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
06Surface hardening
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 38/14 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 38/58 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
58with more than 1.5% by weight of manganese
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 1/06
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
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
06Surface hardening
C21D 1/32
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
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
26Methods of annealing
32Soft annealing, e.g. spheroidising
C21D 1/76
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
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
74Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
76Adjusting the composition of the atmosphere
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 BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
2211Microstructure comprising significant phases
005Ferrite
C21D 6/004
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
6Heat treatment of ferrous alloys
004containing Cr and Ni
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 BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
6Heat treatment of ferrous alloys
005containing Mn
Applicants
  • 日本製鉄株式会社 NIPPON STEEL CORPORATION [JP]/[JP]
Inventors
  • 橋本 元仙 HASHIMOTO, Motonori
  • 匹田 和夫 HIKIDA, Kazuo
  • 戸田 由梨 TODA, Yuri
Agents
  • 金本 哲男 KANEMOTO, Tetsuo
  • 萩原 康司 HAGIWARA, Yasushi
Priority Data
2017-16720631.08.2017JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) STEEL SHEET FOR CARBURIZING, AND PRODUCTION METHOD FOR STEEL SHEET FOR CARBURIZING
(FR) TÔLE D'ACIER POUR CÉMENTATION ET PROCÉDÉ DE PRODUCTION DE TÔLE D'ACIER POUR CÉMENTATION
(JA) 浸炭用鋼板、及び、浸炭用鋼板の製造方法
Abstract
(EN)
Provided are a steel sheet for carburizing having excellent ductility, and a production method therefor. This steel sheet contains, by mass%, 0.02% to less than 0.30% C, 0.005% to less than 0.5% Si, 0.01% to less than 3.0% Mn, not more than 0.1% P, not more than 0.1% S, 0.0002% to 3.0% sol. Al, not more than 0.2% N, and 0.010% to 0.150% Ti, with the remainder comprising Fe and impurities. The number of carbides per 1,000 μm2 is not more than 100. The percentage of carbides having an aspect ratio of 2.0 or less is 10% or more relative to all carbides. The average circle equivalent diameter of the carbides is not more than 5.0 μm, and the average crystal grain size of ferrite is not more than 10.0 μm.
(FR)
Cette invention concerne une tôle d'acier pour cémentation présentant une excellente ductilité et son procédé de production. Cette tôle d'acier contient, en % en masse, 0,02 % à moins de 0,30 % de C, 0,005 % à moins de 0,5 % de Si, 0,01 % à moins de 3,0 % de Mn, pas plus de 0,1 % de P, pas plus de 0,1 % de S, 0,0002 % à 3,0 % d'Al sol., pas plus de 0,2 % de N, et 0,010 % à 0,150 % de Ti, le reste étant du Fe et des impuretés. Le nombre de carbures pour 1000 μm2 n'est pas supérieur à 100. Le pourcentage de carbures ayant un rapport d'aspect de 2,0 ou moins est de 10 % ou plus par rapport à la totalité de carbures. Le diamètre moyen du cercle équivalent des carbures est inférieur ou égal à 5,0 μm et la taille moyenne du grain cristallin de la ferrite est inférieure ou égale à 10,0 μm.
(JA)
延性により優れた浸炭用鋼板とその製造方法を提供する。本発明の鋼板は、質量%で、C:0.02%以上0.30%未満、Si:0.005%以上0.5%未満、Mn:0.01%以上3.0%未満、P:0.1%以下、S:0.1%以下、sol.Al:0.0002%以上3.0%以下、N:0.2%以下、Ti:0.010%以上0.150%以下を含有し、残部が、Fe及び不純物からなり、1000μm2あたりの炭化物の個数が、100個以下であり、アスペクト比が2.0以下である炭化物の個数割合が、全炭化物に対して10%以上であり、炭化物の平均円相当直径が、5.0μm以下であり、フェライトの平均結晶粒径が、10μm以下である。
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