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1. WO2021075501 - VALVE SPRING

Publication Number WO/2021/075501
Publication Date 22.04.2021
International Application No. PCT/JP2020/038932
International Filing Date 15.10.2020
IPC
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
C21D 8/06 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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
06during manufacturing of rods or wires
C21D 9/52 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
52for wires; for strips
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 38/50 2006.1
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
50with titanium or zirconium
C21D 1/06 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
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
06Surface hardening
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
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 8/06
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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
06during manufacturing of rods or wires
C21D 9/52
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
52for wires; for strips ; ; for rods of unlimited length
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 38/50
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
50with titanium or zirconium
Applicants
  • 日本製鉄株式会社 NIPPON STEEL CORPORATION [JP]/[JP]
  • 日本発條株式会社 NHK SPRING CO., LTD. [JP]/[JP]
  • 日鉄SGワイヤ株式会社 NIPPON STEEL SG WIRE CO., LTD. [JP]/[JP]
Inventors
  • 寺本 真也 TERAMOTO, Shinya
  • 根石 豊 NEISHI, Yutaka
  • 青野 通匡 AONO, Michimasa
  • 小澤 修司 KOZAWA, Shuji
  • 高橋 文雄 TAKAHASHI, Fumio
  • 西元 茂和 NISHIMOTO, Shigekazu
  • 近藤 充博 KONDO, Mitsuhiro
  • 越智 達朗 OCHI, Tatsuro
  • 鈴木 章一 SUZUKI, Shoichi
Agents
  • アセンド特許業務法人 ASCEND IP LAW FIRM
Priority Data
2019-18924516.10.2019JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) VALVE SPRING
(FR) RESSORT DE SOUPAPE
(JA) 弁ばね
Abstract
(EN) The present invention provides a valve spring which has excellent fatigue limit. A valve spring according to one embodiment of the present invention is provided with: a nitride layer that forms the surface layer; and a core part that is positioned on the inner side of the nitride layer. The chemical composition of the core part comprises, in mass%, from 0.53% to 0.59% of C, from 2.51% to 2.90% of Si, from 0.70% to 0.85% of Mn, 0.020% or less of P, 0.020% or less of S, from 1.40% to 1.70% of Cr, from 0.17% to 0.53% of Mo, from 0.23% to 0.33% of V, from 0.0001% to 0.0050% of Ca, 0.050% or less of Cu, 0.050% or less of Ni, 0.0050% or less of Al, 0.050% or less of Ti and 0.0070% or less of N, with the balance being made up of Fe and impurities. The number density of V-based precipitates having a maximum diameter of from 2 nm to 10 nm in the core part is from 500 to 8,000 per μm2; and the number ratio of Ca sulfides to the total number of oxide-based inclusions and sulfide-based inclusions in the core part is 0.20% or less.
(FR) La présente invention concerne un ressort de soupape présentant une excellente limite de fatigue. Un ressort de soupape selon un mode de réalisation de la présente invention comporte : une couche de nitrure qui forme la couche superficielle ; et une partie noyau qui est positionnée sur la face interne de la couche de nitrure. La composition chimique de la partie noyau comprend, en % en masse, de 0,53 à 0,59 % de C, de 2,51 à 2,90 % de Si, de 0,70 à 0,85 % de Mn, une proportion inférieure ou égale à 0,020% de P, une proportion inférieure ou égale à 0,020% de S, de 1,40 à 1,70 % de Cr, de 0,17 à 0,53 % de Mo, de 0,23 à 0,33 % de V, de 0,0001 % à 0,0050 % de Ca, une proportion inférieure ou égale à 0,050 % de Cu, une proportion inférieure ou égale à 0,050 % de Ni, une proportion inférieure ou égale à 0,0050 % d’Al, une proportion inférieure ou égale à 0,050 % de Ti et une proportion inférieure ou égale à 0,0070 % de N, le reste étant constitué de Fe et d'impuretés. Le nombre volumique de précipités à base de V ayant un diamètre maximal allant de 2 nm à 10 nm dans la partie noyau est compris entre 500 et 8 000 par μm2; et le rapport en nombre sulfures de Ca sur nombre total d'inclusions à base d'oxyde et d'inclusions à base de sulfure dans la partie noyau est inférieur ou égal à 0,20 %.
(JA) 優れた疲労限度を有する弁ばねを提供する。本実施形態による弁ばねは、表層に形成されている窒化層と、窒化層よりも内部の芯部とを備える。芯部の化学組成は、質量%で、C:0.53~0.59%、Si:2.51~2.90%、Mn:0.70~0.85%、P:0.020%以下、S:0.020%以下、Cr:1.40~1.70%、Mo:0.17~0.53%、V:0.23~0.33%、Ca:0.0001~0.0050%、Cu:0.050%以下、Ni:0.050%以下、Al:0.0050%以下、Ti:0.050%以下、N:0.0070%以下、及び、残部がFe及び不純物からなり、芯部において最大径が2~10nmであるV系析出物の数密度が500~8000個/μmであり、芯部において、酸化物系介在物及び前記硫化物系介在物の総個数に対する前記Ca硫化物の個数割合が0.20%以下である。
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