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1. WO2016148037 - STEEL SHEET FOR CARBURIZATION HAVING EXCELLENT COLD WORKABILITY AND TOUGHNESS AFTER CARBURIZING HEAT TREATMENT

Publication Number WO/2016/148037
Publication Date 22.09.2016
International Application No. PCT/JP2016/057684
International Filing Date 10.03.2016
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
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 38/06 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
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
C21C 7/04 2006.1
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/-C21C5/118
04Removing impurities by adding a treating agent
C21C 7/06 2006.1
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/-C21C5/118
04Removing impurities by adding a treating agent
06Deoxidising, e.g. killing
CPC
C21C 7/04
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
04Removing impurities by adding a treating agent
C21C 7/06
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
04Removing impurities by adding a treating agent
06Deoxidising, e.g. killing
C21C 7/10
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
7Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
10Handling in a vacuum
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, e.g. BY DECARBURISATION OR TEMPERING
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
06Surface hardening
C21D 1/18
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
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
18Hardening
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
  • 株式会社神戸製鋼所 KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.) [JP]/[JP]
Inventors
  • 土田 武広 TSUCHIDA Takehiro
  • 梶原 桂 KAJIHARA Katsura
Agents
  • 特許業務法人栄光特許事務所 EIKOH PATENT FIRM, P.C.
Priority Data
2015-05144413.03.2015JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) STEEL SHEET FOR CARBURIZATION HAVING EXCELLENT COLD WORKABILITY AND TOUGHNESS AFTER CARBURIZING HEAT TREATMENT
(FR) TÔLE D'ACIER DESTINÉE À LA CÉMENTATION POSSÉDANT D'EXCELLENTES APTITUDES AU FAÇONNAGE À FROID ET TÉNACITÉ APRÈS TRAITEMENT THERMIQUE DE CÉMENTATION
(JA) 冷間加工性と浸炭熱処理後の靱性に優れる浸炭用鋼板
Abstract
(EN) This steel sheet for carburization having excellent cold workability and toughness after carburizing heat treatment has a sheet thickness of 2-10 mm, a component composition containing specific amounts of C, Mn, Al and N with the balance made up of iron and unavoidable impurities, and a steel structure composed of ferrite and carbides. With respect to the ferrite, the number of ferrite crystal grains having an aspect ratio of 3 or less is 60% or more of the number of all ferrite crystal grains, and the average crystal grain size of all crystal grains is within the range of 3-50 μm. With respect to the carbides, the number of carbides having an aspect ratio of 2 or less is 80% or more of the number of all carbides, and the average circle-equivalent diameter of all carbides is 0.6 μm or less.
(FR) L'invention concerne une tôle d'acier destinée à la cémentation possédant d'excellentes aptitudes au façonnage à froid et ténacité après traitement thermique de cémentation, qui a une épaisseur de tôle de 2 à 10 mm, une composition des constituants contenant des quantités particulières de C, Mn, Al et N, le reste étant constitué de fer et d'impuretés inévitables, et une structure d'acier composée de ferrite et de carbures. En ce qui concerne la ferrite, le nombre de grains cristallins de ferrite ayant un rapport de forme inférieur ou égal à 3 est supérieur ou égal à 60 % du nombre de tous les grains cristallins de ferrite et la taille moyenne de grain cristallin de tous les grains cristallins est dans la plage de 3 à 50 µm. En ce qui concerne les carbures, le nombre de carbures ayant un rapport de forme inférieur ou égal à 2 est supérieur ou égal à 80 % du nombre de tous les carbures et le diamètre moyen de cercle équivalent de tous les carbures est inférieur ou égal à 0,6 µm.
(JA)  板厚が2~10mmであり、成分組成がC、Mn、Al、Nをそれぞれ特定量含み、残部は鉄および不可避的不純物からなり、鋼組織がフェライトと炭化物からなる。フェライトは、アスペクト比が3以下のフェライト結晶粒の個数が全フェライト結晶粒の個数の60%以上であり、全結晶粒の平均結晶粒径が3~50μmの範囲である。炭化物は、アスペクト比が2以下の炭化物の個数が全炭化物の個数の80%以上であり、全炭化物の平均円相当直径が0.6μm以下である。
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