EP0851038B2 - Acier et procédé pour la fabrication d'une piéce en acier mise en forme par déformation plastique à froid - Google Patents

Acier et procédé pour la fabrication d'une piéce en acier mise en forme par déformation plastique à froid Download PDF

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Publication number
EP0851038B2
EP0851038B2 EP97402978A EP97402978A EP0851038B2 EP 0851038 B2 EP0851038 B2 EP 0851038B2 EP 97402978 A EP97402978 A EP 97402978A EP 97402978 A EP97402978 A EP 97402978A EP 0851038 B2 EP0851038 B2 EP 0851038B2
Authority
EP
European Patent Office
Prior art keywords
cold
steel
plastic deformation
component
rolled product
Prior art date
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.)
Expired - Lifetime
Application number
EP97402978A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0851038B1 (fr
EP0851038A1 (fr
Inventor
Claude Pichard
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.)
Ascometal France Holding SAS
Original Assignee
Ascometal SA
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.)
Filing date
Publication date
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Application filed by Ascometal SA filed Critical Ascometal SA
Publication of EP0851038A1 publication Critical patent/EP0851038A1/fr
Application granted granted Critical
Publication of EP0851038B1 publication Critical patent/EP0851038B1/fr
Publication of EP0851038B2 publication Critical patent/EP0851038B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • C21D2211/002—Bainite
    • 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

Definitions

  • the invention relates to a use of a steel and a method for the manufacture of a steel part shaped by cold plastic deformation.
  • the steel used has a carbon content of between 0.2% and 0.42% (by weight). It is combined with either chromium, chromium - molybdenum, nickel - chromium or nickel - chromium - molybdenum or, finally, with manganese - chromium, so as to be sufficiently soaking to obtain after quenching a structure. martensitique, structure necessary to obtain after income the desired mechanical characteristics which are on the one hand a high tensile strength, on the other hand a good ductility.
  • the steel In order to be able to be cold-formed, the steel must first be subjected to a heat treatment of globulization or "maximum softening" consisting of holding at a temperature above 650 ° C. for a long time that can reach several dozens of hours. This treatment gives the steel a pearlitic structure globulized, easy to deform cold.
  • This technique has the disadvantage, in particular, of requiring three heat treatments, which complicates the manufacture and increases costs.
  • the document JP-A-50 655 40 discloses a method of manufacturing a high strength bolt of composition by weight:
  • the object of the present invention is to overcome this disadvantage by providing a means for manufacturing, by forming by cold plastic deformation, a high-grade steel mechanical part, without the need to do or treatment. maximum heat transfer or softening temperature or heat treatment of income.
  • the subject of the invention is a use of a steel according to claim 1.
  • the invention also relates to a method for the manufacture of a steel part shaped by cold plastic deformation which comprises for heat treatment only, quenching.
  • quenching is used, here and throughout, in the broad sense, that is to say that it is a fast enough cooling to obtain a structure which is practically not ferrito-pearlite and which is not essentially martensitic either.
  • the process consists in hot rolling a half-product made of steel to obtain a hot-rolled product, possibly cutting a slug in the hot-rolled product, and shaping the slug or slab by cold plastic deformation. rolled product.
  • Quenching which is intended to give the part an essentially bainitic structure, can be carried out both before and after the cold forming.
  • quenching can be carried out both directly in the hot rolling mill and after reheating austenitization over AC 3 .
  • quenching is performed after austenitization by reheating above AC 3 .
  • the invention relates to a cold-formed steel part according to claim 8.
  • the chemical composition of steel must satisfy the relationship: Mn + 0.9 x Cr + 1.3 x Mo + 1.6 x V ⁇ 2.2% which ensures that the combination of the manganese, chromium, molybdenum and vanadium contents makes it possible to obtain the desired strength characteristics and an essentially bainitic structure.
  • This steel has the advantage of having a very good ability to cold plastic deformation and to obtain, without the need for income, a bainitic type structure having excellent ductility and high characteristics mechanical.
  • the ductility can be measured by the necking Z which is greater than 45%, and even greater than 50%.
  • the tensile strength Rm is greater than 650 MPa and can exceed 1200 MPa.
  • a semi-finished steel product having the above-mentioned composition is supplied and hot-rolled after reheating above 940 ° C to obtain a hot-rolled product such as a bar , a billet, or a wire rod.
  • the hot rolling is finished at a temperature of between 900 ° C. and 1050 ° C. and the hot-rolled product is immersed directly in the hot rolling mill by cooling with the blown air, at oil, mist, water or water with polymers, according to its section.
  • the product thus obtained is then cut into pieces and then shaped in the cold form, for example by cold forging or cold forging.
  • the final mechanical characteristics, obtained directly after cold forming result, in particular, the work hardening generated by the cold forming operation.
  • the rolled product is quenched after austenitization and then cut into pieces which are shaped by cold plastic deformation, or the slugs are cut before the quenching and then the setting in cold form.
  • the austenitization consists of a heating between AC 3 and 970 ° C
  • the quenching is carried out by cooling with the blown air, the oil, the fog, the water or the water added with polymers, depending on the product section.
  • the final mechanical characteristics, obtained directly after cold forming result, in particular, the work hardening generated by the forming operation.
  • the end-of-rolling conditions are not of particular importance.
  • the cold forming operation is performed on a cut slug in the hot rolled product and quenching is carried out after cold forming.
  • the quenching is carried out after heating between AC 3 and 970 ° C and by cooling with blown air, oil, mist, water or water containing polymers.
  • the end-of-rolling conditions are also not of particular importance.
  • the invention intended more particularly for the manufacture of mechanical parts is also applicable to the manufacture of cold drawn bars, wire drawn and machine son unwound, cold drawing, drawing and unwinding being modes. particular shaping by cold plastic deformation.
  • Drawn bars and machine or drawn wire may be peeled, shaved or ground to a flawless surface condition.
  • the term "cold-formed steel part” covers all these products, and the term “slug” covers, in particular, any section of bar or wire; in some cases, the bars or wires are not cut into pieces before being cold-formed.
  • the invention may, finally, be used to manufacture pretreated bars or pretreated yarns, or more generally pretreated steel products, intended to be used in the state for the manufacture of parts by cold forming without additional heat treatment .
  • These steel products are quenched after hot rolling either directly in the hot rolling or after austenitization, in order to have a substantially bainitic structure (bainite ⁇ 50%). They can be peeled or shaved to have a flawless surface condition.
  • the cold tensile-torsion test consists of subjecting a specimen to 3 turns of cold twisting to simulate the shaping by plastic deformation, before performing a tensile test at ambient temperature.
  • the increase in resistance corresponds to the relative increase in resistance between the hardened state (after 3 turns of torsion) and the normal state (before the 3 turns of torsion).
  • the results obtained show that, even after a large cold deformation (three turns of torsion), the necking remains greater than 50%, and that the tensile strength can exceed 1200 MPa.
  • the work hardening capacity, measured by the increase in resistance after deformation by cold twisting, is high in all cases.
  • the rounds were subjected to cold forging shaping tests consisting of the measurement of the Limited Crush Rate (T.E.L.) by crushing rolled cylinders along a generator.
  • the Crush Rate Limit expressed in%, is the crush rate above which appears the first crack by cold press forging in the notch made following the generatrix of the cylinder.
  • This steel according to the prior art had previously been subjected to a globularization annealing of the perlite to make it suitable for cold deformation.
  • the steel used according to the invention has a cold forging shaping capacity substantially greater than the steel according to the prior art, despite a higher hardness, and this whatever the level of resistance, even if it is high (treatment F).
  • these steels were hot-rolled in the form of bars of diameter 28 mm. After rolling and before cold forming, the bars were subjected to a warm oil quenching treatment at 50 ° C after austenitization at 950 ° C. The bars were cut to obtain pieces from which the pieces were shaped by cold stamping at the deformation rate of 60%.
  • cold forming ability is excellent since, despite high initial strength levels and high cold deformation (60%), cold-worked parts have been found to be free of internal defects. external.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Control Of Metal Rolling (AREA)
  • Inert Electrodes (AREA)
  • Metal Rolling (AREA)
EP97402978A 1996-12-31 1997-12-10 Acier et procédé pour la fabrication d'une piéce en acier mise en forme par déformation plastique à froid Expired - Lifetime EP0851038B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9616254 1996-12-31
FR9616254A FR2757877B1 (fr) 1996-12-31 1996-12-31 Acier et procede pour la fabrication d'une piece en acier mise en forme par deformation plastique a froid

Publications (3)

Publication Number Publication Date
EP0851038A1 EP0851038A1 (fr) 1998-07-01
EP0851038B1 EP0851038B1 (fr) 2003-03-26
EP0851038B2 true EP0851038B2 (fr) 2007-11-07

Family

ID=9499333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97402978A Expired - Lifetime EP0851038B2 (fr) 1996-12-31 1997-12-10 Acier et procédé pour la fabrication d'une piéce en acier mise en forme par déformation plastique à froid

Country Status (20)

Country Link
US (1) US5919415A (cs)
EP (1) EP0851038B2 (cs)
JP (2) JP3988095B2 (cs)
KR (1) KR19980064836A (cs)
CN (1) CN1195708A (cs)
AR (1) AR011312A1 (cs)
AT (1) ATE235579T1 (cs)
BR (1) BR9705637A (cs)
CA (1) CA2225782A1 (cs)
CZ (1) CZ412897A3 (cs)
DE (1) DE69720163T3 (cs)
DK (1) DK0851038T4 (cs)
ES (1) ES2196279T5 (cs)
FR (1) FR2757877B1 (cs)
HU (1) HUP9702515A3 (cs)
NO (1) NO321331B1 (cs)
PL (1) PL191871B1 (cs)
PT (1) PT851038E (cs)
RU (1) RU2201468C2 (cs)
SI (1) SI9700323A (cs)

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NL1011806C2 (nl) † 1999-04-15 2000-10-17 Skf Engineering & Res Services Kogellagerstaal met een oppervlak met een onderbainitische structuur en een werkwijze voor het vervaardigen daarvan.
FR2802607B1 (fr) 1999-12-15 2002-02-01 Inst Francais Du Petrole Conduite flexible comportant des armures en acier bas carbone
KR20010059686A (ko) * 1999-12-30 2001-07-06 이계안 프레스 소입에 의해 베이나이트 조직을 갖는 강 조성물
FR2807068B1 (fr) * 2000-03-29 2002-10-11 Usinor Acier lamine a chaud a tres haute limite d'elasticite et resistance mecanique utilisable notamment pour la realisation de piece de vehicules automobiles
CZ298442B6 (cs) * 2000-11-22 2007-10-03 Kabushiki Kaisha Kobe Seiko Sho Ocel pro kování s vysokou pevností
US6632301B2 (en) 2000-12-01 2003-10-14 Benton Graphics, Inc. Method and apparatus for bainite blades
FR2820150B1 (fr) * 2001-01-26 2003-03-28 Usinor Acier isotrope a haute resistance, procede de fabrication de toles et toles obtenues
US20030070736A1 (en) * 2001-10-12 2003-04-17 Borg Warner Inc. High-hardness, highly ductile ferrous articles
US6843237B2 (en) 2001-11-27 2005-01-18 Exxonmobil Upstream Research Company CNG fuel storage and delivery systems for natural gas powered vehicles
US6852175B2 (en) * 2001-11-27 2005-02-08 Exxonmobil Upstream Research Company High strength marine structures
KR100554753B1 (ko) * 2001-12-27 2006-02-24 주식회사 포스코 성형성 및 용접성이 우수한 고강도 냉연강판과 그 제조방법
US20040025987A1 (en) * 2002-05-31 2004-02-12 Bhagwat Anand W. High carbon steel wire with bainitic structure for spring and other cold-formed applications
FR2844281B1 (fr) * 2002-09-06 2005-04-29 Usinor Acier a tres haute resistance mecanique et procede de fabrication d'une feuille de cet acier revetue de zinc ou d'alliage de zinc
US7416617B2 (en) 2002-10-01 2008-08-26 Sumitomo Metal Industries, Ltd. High strength seamless steel pipe excellent in hydrogen-induced cracking resistance
FR2845694B1 (fr) * 2002-10-14 2005-12-30 Usinor Procede de fabrication de toles d'acier durcissables par cuisson, toles d'acier et pieces ainsi obtenues
JP4788861B2 (ja) * 2003-11-28 2011-10-05 ヤマハ株式会社 楽器弦用鋼線およびその製造方法
RU2249625C1 (ru) * 2003-12-26 2005-04-10 Общество с ограниченной ответственностью "Интелмет НТ" Сортовой прокат, круглый, из низколегированной стали для холодной объемной штамповки высокопрочных крепежных деталей
AR047467A1 (es) 2004-01-30 2006-01-18 Sumitomo Metal Ind Tubo de acero sin costura para pozos petroliferos y procedimiento para fabricarlo
DE102005052069B4 (de) † 2005-10-28 2015-07-09 Saarstahl Ag Verfahren zum Herstellen von Vormaterial aus Stahl durch Warmverformen
ES2522904T3 (es) * 2007-04-05 2014-11-19 Kabushiki Kaisha Kobe Seiko Sho Acero de forja, forjado y cigüeñal
RU2363754C1 (ru) * 2008-01-09 2009-08-10 Открытое акционерное общество "Оскольский электрометаллургический комбинат" (ОАО "ОЭМК") Сталь повышенной прокаливаемости и обрабатываемости
RU2356996C1 (ru) * 2008-03-27 2009-05-27 Юлия Алексеевна Щепочкина Сталь
EP2199422A1 (en) 2008-12-15 2010-06-23 Swiss Steel AG Low-carbon precipitation-strengthened steel for cold heading applications
RU2394933C1 (ru) * 2009-03-13 2010-07-20 Юлия Алексеевна Щепочкина Сталь
DE102009016079B4 (de) * 2009-04-03 2018-09-06 Zf Friedrichshafen Ag Kugelzapfen aus einem Stahl mit bainitischem Gefüge und Verfahren zur Herstellung derartiger Kugelzapfen
BRPI0901378A2 (pt) * 2009-04-03 2010-12-21 Villares Metals Sa aço bainìtico para moldes
FI20095528L (fi) * 2009-05-11 2010-11-12 Rautaruukki Oyj Menetelmä kuumavalssatun nauhaterästuotteen valmistamiseksi sekä kuumavalssattu nauhaterästuote
DE102010024664A1 (de) * 2009-06-29 2011-02-17 Salzgitter Flachstahl Gmbh Verfahren zum Herstellen eines Bauteils aus einem lufthärtbaren Stahl und ein damit hergestelltes Bauteil
RU2484173C1 (ru) * 2012-01-10 2013-06-10 Открытое акционерное общество "Металлургический завод имени А.К. Серова" Автоматная свинецсодержащая сталь
WO2015097349A1 (fr) 2013-12-24 2015-07-02 Arcelormittal Wire France Fil laminé à froid en acier à haute résistance à la fatigue et à la fragilisation par l'hydrogène et renfort de conduites flexibles l'incorporant
CN105313961A (zh) * 2015-09-17 2016-02-10 温州三联锻造有限公司 汽车转向器节叉锻件及其锻造方法
EP3168312B1 (de) * 2015-11-16 2019-04-10 Deutsche Edelstahlwerke Specialty Steel GmbH & Co. KG Edelbaustahl mit bainitischem gefüge, daraus hergestelltes schmiedeteil und verfahren zur herstellung eines schmiedeteils
CN105624586B (zh) * 2015-12-29 2017-11-03 钢铁研究总院 一种适用于海洋环境的耐腐蚀桥梁支座用钢
DE102016117494A1 (de) 2016-09-16 2018-03-22 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines umgeformten Bauteils aus einem mittelmanganhaltigen Stahlflachprodukt und ein derartiges Bauteil
CN113832389B (zh) * 2020-06-24 2022-10-21 宝山钢铁股份有限公司 一种冷挤压圆钢及其制造方法
US20220195550A1 (en) * 2020-12-23 2022-06-23 Caterpillar Inc. Air-hardened machine components
CN113684423B (zh) * 2021-10-26 2022-01-28 江苏省沙钢钢铁研究院有限公司 一种高碳钢盘条

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GB2195658A (en) † 1986-09-11 1988-04-13 British Steel Corp Production of steel

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Also Published As

Publication number Publication date
CA2225782A1 (fr) 1998-06-30
KR19980064836A (ko) 1998-10-07
DE69720163T2 (de) 2004-03-04
DK0851038T3 (da) 2003-07-21
FR2757877B1 (fr) 1999-02-05
PT851038E (pt) 2003-07-31
NO976099D0 (no) 1997-12-29
JPH10204585A (ja) 1998-08-04
ES2196279T3 (es) 2003-12-16
HUP9702515A3 (en) 1999-06-28
PL324075A1 (en) 1998-07-06
JP3988095B2 (ja) 2007-10-10
FR2757877A1 (fr) 1998-07-03
HUP9702515A2 (hu) 1998-07-28
NO976099L (no) 1998-07-01
JP2007284796A (ja) 2007-11-01
RU2201468C2 (ru) 2003-03-27
EP0851038B1 (fr) 2003-03-26
DE69720163T3 (de) 2008-03-06
NO321331B1 (no) 2006-04-24
CN1195708A (zh) 1998-10-14
PL191871B1 (pl) 2006-07-31
US5919415A (en) 1999-07-06
DE69720163D1 (de) 2003-04-30
HU9702515D0 (en) 1998-03-02
ES2196279T5 (es) 2008-05-01
ATE235579T1 (de) 2003-04-15
BR9705637A (pt) 1999-08-03
SI9700323A (sl) 1998-08-31
AR011312A1 (es) 2000-08-16
DK0851038T4 (da) 2008-01-02
EP0851038A1 (fr) 1998-07-01
CZ412897A3 (cs) 1999-05-12

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