EP2546379A4 - High-strength steel and high-strength bolt with excellent resistance to delayed fracture, and manufacturing method therefor - Google Patents

High-strength steel and high-strength bolt with excellent resistance to delayed fracture, and manufacturing method therefor

Info

Publication number: EP2546379A4
Authority: EP; European Patent Office
Prior art keywords: manufacturing; strength; method therefor; excellent resistance; delayed fracture
Prior art date: 2010-03-11
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Granted

Application number

EP11753527.8A

Other languages

German (de)

French (fr)

Other versions

EP2546379A1 (en

EP2546379B1 (en

Inventor

Daisuke Hirakami

Tetsushi Chida

Toshimi Tarui

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Nippon Steel Corp

Original Assignee

Nippon Steel and Sumitomo Metal Corp

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

2010-03-11

Filing date

2011-03-11

Publication date

2013-08-07

2011-03-11 Application filed by Nippon Steel and Sumitomo Metal Corp filed Critical Nippon Steel and Sumitomo Metal Corp

2013-01-16 Publication of EP2546379A1 publication Critical patent/EP2546379A1/en

2013-08-07 Publication of EP2546379A4 publication Critical patent/EP2546379A4/en

2015-04-29 Application granted granted Critical

2015-04-29 Publication of EP2546379B1 publication Critical patent/EP2546379B1/en

Status Not-in-force legal-status Critical Current

2031-03-11 Anticipated expiration legal-status Critical

Classifications

- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- C21D2221/00—Treating localised areas of an article
- C21D2221/10—Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively

Landscapes

Chemical & Material Sciences (AREA)
Engineering & Computer Science (AREA)
Materials Engineering (AREA)
Mechanical Engineering (AREA)
Metallurgy (AREA)
Organic Chemistry (AREA)
Thermal Sciences (AREA)
Physics & Mathematics (AREA)
Crystallography & Structural Chemistry (AREA)
Manufacturing & Machinery (AREA)
Chemical Kinetics & Catalysis (AREA)
Heat Treatment Of Articles (AREA)
Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Heat Treatment Of Strip Materials And Filament Materials (AREA)
Heat Treatment Of Steel (AREA)
Laminated Bodies (AREA)

EP20110753527 2010-03-11 2011-03-11 High-strength steel and high-strength bolt with excellent resistance to delayed fracture, and manufacturing method therefor Not-in-force EP2546379B1 (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
JP2010054649		2010-03-11
PCT/JP2011/056481 WO2011111872A1 (en)	2010-03-11	2011-03-11	High-strength steel and high-strength bolt with excellent resistance to delayed fracture, and manufacturing method therefor

Publications (3)

Publication Number	Publication Date
EP2546379A1 EP2546379A1 (en)	2013-01-16
EP2546379A4 true EP2546379A4 (en)	2013-08-07
EP2546379B1 EP2546379B1 (en)	2015-04-29

Family

ID=44563661

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP20110753527 Not-in-force EP2546379B1 (en)	2010-03-11	2011-03-11	High-strength steel and high-strength bolt with excellent resistance to delayed fracture, and manufacturing method therefor

Country Status (7)

Country	Link
US (1)	US20120247618A1 (en)
EP (1)	EP2546379B1 (en)
JP (1)	JP5177323B2 (en)
KR (1)	KR101366375B1 (en)
CN (1)	CN102812145A (en)
IN (1)	IN2012DN05089A (en)
WO (1)	WO2011111872A1 (en)

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US20130284319A1 (en) *	2012-04-27	2013-10-31	Paul M. Novotny	High Strength, High Toughness Steel Alloy
JP5522322B1 (en)	2012-06-20	2014-06-18	新日鐵住金株式会社	Oil well pipe steel and its manufacturing method
BR112015005870B1 (en) *	2012-11-05	2018-11-21	Nippon Steel & Sumitomo Metal Corporation	low alloy steel for tubular oil industry products that have sulphide stress crack resistance and manufacturing method
CN102943210B (en) *	2012-11-09	2015-02-04	谢亚平	High-strength bolt and processing method thereof
KR20140121229A (en) *	2013-04-05	2014-10-15	태양금속공업주식회사	A manufacturing method of steel bolt having high tensile strength
ES2744909T3 (en)	2013-06-07	2020-02-26	Nippon Steel Corp	Heat treated steel material and method of manufacture thereof
NL2011269C2 (en) *	2013-08-05	2015-02-09	Onderzoekscentrum Voor Aanwending Van Staal N V	Structure for use in a corrosive environment.
JP6422176B2 (en) *	2014-08-29	2018-11-14	日産自動車株式会社	Steel for high-strength bolts and high-strength bolts
CN104313492B (en) *	2014-11-07	2017-04-12	广东鼎耀工程技术有限公司	PC steel bar with high strength and toughness and heat treatment method thereof
DE102014017275A1 (en) *	2014-11-18	2016-05-19	Salzgitter Flachstahl Gmbh	High strength air hardening multiphase steel with excellent processing properties and method of making a strip of this steel
JP6427272B2 (en) *	2015-06-29	2018-11-21	新日鐵住金株式会社	bolt
CN105861919A (en) *	2016-06-14	2016-08-17	江苏永昊高强度螺栓有限公司	Production process of high-strength bolt
US11098394B2 (en) *	2016-07-05	2021-08-24	Nippon Steel Corporation	Rolled wire rod
CN106521316B (en) *	2016-11-15	2018-08-07	江阴兴澄特种钢铁有限公司	Carbon and low-alloy round steel and its manufacturing method in a kind of fastener high-hardenability
CN106756516B (en) *	2017-02-07	2018-06-08	和县隆盛精密机械有限公司	A kind of alloy-steel casting and its casting technique suitable for mechanical arm clamping screw
CN107058705A (en) *	2017-02-17	2017-08-18	江苏佳杰特种螺钉有限公司	A kind of production technology for the fastener applied in high ferro
RU2635641C1 (en) *	2017-03-28	2017-11-14	Юлия Алексеевна Щепочкина	Cast steel
KR20200004407A (en) *	2017-06-15	2020-01-13	닛폰세이테츠 가부시키가이샤	Rolled Wire for Spring Steel
CN107513664A (en) *	2017-07-10	2017-12-26	安徽长江紧固件有限责任公司	A kind of torsion shear type high tensile bolt and its processing technology
CN107604243B (en) *	2017-08-09	2019-10-08	宁波市镇海甬鼎紧固件制造有限公司	A kind of high-strength bolt material and preparation method thereof
JP2019124481A (en) *	2018-01-12	2019-07-25	株式会社神戸製鋼所	Residual stress measurement method
US11333189B2 (en)	2018-01-30	2022-05-17	Nissan Motor Co., Ltd.	Bolt
WO2019150437A1 (en) *	2018-01-30	2019-08-08	日産自動車株式会社	Bolt and fastened structure
CN109266964B (en) *	2018-10-25	2021-03-05	青岛天赢智能工业股份有限公司	Production and machining process of steel forging
JP7479794B2 (en) *	2019-04-16	2024-05-09	高周波熱錬株式会社	PC steel with excellent delayed fracture resistance and its manufacturing method
KR102599767B1 (en) *	2019-05-14	2023-11-08	닛폰세이테츠 가부시키가이샤	Bolts and steel materials for bolts
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CN113322410B (en) *	2020-02-28	2022-06-28	宝山钢铁股份有限公司	High-strength bolt steel with excellent delayed fracture resistance and preparation method thereof
CN111931309B (en) *	2020-08-24	2022-09-09	长江水利委员会长江科学院	A method for simulating tensile hardening and softening fracture of anchor rod/anchor cable structure
CN112795854A (en) *	2020-12-23	2021-05-14	石家庄钢铁有限责任公司	High-strength fastener bolt steel and production method thereof
CN115433871B (en) *	2021-06-02	2023-07-07	宝山钢铁股份有限公司	High-strength steel resistant to hydrogen embrittlement delayed fracture and manufacturing method thereof
CN114058974B (en) *	2021-11-30	2022-09-13	马鞍山钢铁股份有限公司	15.9-grade corrosion-resistant high-strength bolt steel and production method and heat treatment method thereof
CN115386803B (en) *	2022-08-31	2023-07-25	马鞍山钢铁股份有限公司	Non-quenched and tempered steel for high-strength and high-toughness wind power bolts and production method thereof
CN116445829B (en) *	2023-06-16	2023-09-08	中国矿业大学(北京)	Corrosion-resistant anchor rod and production process thereof
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JP2000337332A (en) *	2000-01-01	2000-12-05	Kobe Steel Ltd	High strength bolt excellent in delayed fracture resistance
JP2000337334A (en) *	2000-01-01	2000-12-05	Kobe Steel Ltd	High structure bolt excellent in delayed fracture resistance
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JP2009299181A (en) *	2008-05-13	2009-12-24	Nippon Steel Corp	High strength steel having excellent delayed fracture resistance, high strength bolt, and method for producing the same
JP2009299180A (en) *	2008-05-13	2009-12-24	Nippon Steel Corp	High strength steel having excellent delayed fracture resistance, high strength bolt, and method for producing the same

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JPH10226817A (en) *	1996-12-11	1998-08-25	Sumitomo Metal Ind Ltd	Method of manufacturing steel for nitrocarburizing and nitrocarburized parts using the steel

2011
- 2011-03-11 CN CN201180013427XA patent/CN102812145A/en active Pending
- 2011-03-11 US US13/515,444 patent/US20120247618A1/en not_active Abandoned
- 2011-03-11 KR KR1020127010100A patent/KR101366375B1/en not_active Expired - Fee Related
- 2011-03-11 IN IN5089DEN2012 patent/IN2012DN05089A/en unknown
- 2011-03-11 WO PCT/JP2011/056481 patent/WO2011111872A1/en active Application Filing
- 2011-03-11 JP JP2012502334A patent/JP5177323B2/en not_active Expired - Fee Related
- 2011-03-11 EP EP20110753527 patent/EP2546379B1/en not_active Not-in-force

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US6017641A (en) *	1997-03-12	2000-01-25	Chuo Hatsujo Kabshiki Kaisha	Coil spring resistive to delayed fracture and manufacturing method of the same
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Publication number	Publication date
KR101366375B1 (en)	2014-02-24
KR20120056879A (en)	2012-06-04
WO2011111872A1 (en)	2011-09-15
EP2546379A1 (en)	2013-01-16
JPWO2011111872A1 (en)	2013-06-27
CN102812145A (en)	2012-12-05
US20120247618A1 (en)	2012-10-04
EP2546379B1 (en)	2015-04-29
JP5177323B2 (en)	2013-04-03
IN2012DN05089A (en)	2015-10-09

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