EP0526330A1 - Verfahren zum Herstellen dünnwandiger Rohre, Stahl zum Herstellen dieser Rohre und nach diesem Verfahren hergestellte Rohre für Fahrradrahmen - Google Patents

Verfahren zum Herstellen dünnwandiger Rohre, Stahl zum Herstellen dieser Rohre und nach diesem Verfahren hergestellte Rohre für Fahrradrahmen Download PDF

Info

Publication number
EP0526330A1
EP0526330A1 EP92402184A EP92402184A EP0526330A1 EP 0526330 A1 EP0526330 A1 EP 0526330A1 EP 92402184 A EP92402184 A EP 92402184A EP 92402184 A EP92402184 A EP 92402184A EP 0526330 A1 EP0526330 A1 EP 0526330A1
Authority
EP
European Patent Office
Prior art keywords
steel
tubes
tube
blank
hot forming
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.)
Granted
Application number
EP92402184A
Other languages
English (en)
French (fr)
Other versions
EP0526330B1 (de
Inventor
Gérard Fabre
Antonio Colombo
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 SA
COLUMBUS SpA
Original Assignee
Ascometal SA
COLUMBUS SpA
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
Application filed by Ascometal SA, COLUMBUS SpA filed Critical Ascometal SA
Publication of EP0526330A1 publication Critical patent/EP0526330A1/de
Application granted granted Critical
Publication of EP0526330B1 publication Critical patent/EP0526330B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening

Definitions

  • the invention relates to a method for manufacturing a thin-walled tube, in particular for a cycle frame and fork, to a steel for producing this tube and to a tube for a cycle frame or fork obtained by the method. of the invention.
  • a steel of the 35CD4 type (according to the AFNOR standard) is used, that is to say a steel containing approximately C: 0.35%, Cr: 1%, Mo: 0.25% and, after stretching or hammering, the tubes are subjected to a quenching and tempering heat treatment.
  • the object of the present invention is to remedy these drawbacks by proposing a method of manufacturing steel tubes which does not require installation of additional heat treatment and which leads to light cycle frames and forks with good fatigue resistance.
  • the alloying elements are chromium and molybdenum; the carburetor elements are niobium and vanadium; the reheating temperature, before hot plastic deformation, is greater than 1200 ° C.
  • the steel used can preferably have the following chemical composition by weight: the rest being iron and impurities resulting from the fusion of raw materials.
  • the invention also relates to tubes for the manufacture of frames and forks of cycles produced using the method according to the invention and constituted for example of a steel having the chemical composition indicated above.
  • tubes are obtained which have a tensile strength Rm ⁇ 1100 MPa, an elastic limit Re ⁇ 1000 MPa, an elongation A% ⁇ 12%; these properties are preserved in the zones affected by the heat of welding of the tubes during the assembly of the frames.
  • These mechanical properties make it possible to produce more fork frame assemblies weighing 1.8 kg against 2.25 kg with usual techniques, ie a gain of around 20% while having very good resistance to fatigue and very good rigidity.
  • tubes for a cycle frame or fork pieces are cut to the desired size from bars, for example 140 mm in diameter. After reheating at high temperature, these pieces are pierced during their hot rolling using two oblique cylinders and a mandrel then they are always stretched hot first on a train with vocational steps and then on a finishing train for example with six cages; after these hot plastic deformation operations, the tubes are allowed to cool naturally in air. The tubes thus obtained are then cold drawn and then hammered or cold rolled after recrystallization annealing at around 700 ° C.
  • the hammering or cold rolling operation makes it possible to give their final shape to the tubes with walls of variable thickness, for example thicker at the ends than in the body of the tube; this also makes it possible to give them a conical shape, to ovalize them or even to create a helical rib on the internal wall.
  • the tubes are assembled either by brazing with brass or by TIG welding. These operations locally heat the metal up to temperatures above 800 ° C which degrade its characteristics. Also in the welding zones it is necessary to increase the thickness of the walls of the tubes, this thickness being commonly increased to 0.9 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)
EP92402184A 1991-07-30 1992-07-29 Verfahren zum Herstellen dünnwandiger Rohre, Stahl zum Herstellen dieser Rohre und nach diesem Verfahren hergestellte Rohre für Fahrradrahmen Expired - Lifetime EP0526330B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9109677 1991-07-30
FR9109677A FR2679924B1 (fr) 1991-07-30 1991-07-30 Procede de fabrication d'un tube en acier a paroi mince, acier pour la realisation de ce tube et tube pour cadre de cycle obtenu.

Publications (2)

Publication Number Publication Date
EP0526330A1 true EP0526330A1 (de) 1993-02-03
EP0526330B1 EP0526330B1 (de) 1997-06-11

Family

ID=9415728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402184A Expired - Lifetime EP0526330B1 (de) 1991-07-30 1992-07-29 Verfahren zum Herstellen dünnwandiger Rohre, Stahl zum Herstellen dieser Rohre und nach diesem Verfahren hergestellte Rohre für Fahrradrahmen

Country Status (4)

Country Link
EP (1) EP0526330B1 (de)
DE (1) DE69220304T2 (de)
ES (1) ES2104869T3 (de)
FR (1) FR2679924B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2727981A1 (fr) * 1994-12-13 1996-06-14 Ascometal Sa Procede de fabrication d'une piece en acier de construction mecanique et piece ainsi fabriquee

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2362878A1 (de) * 1972-12-20 1974-07-04 Bethlehem Steel Corp Bearbeitete (as-worked) bainitische eisenlegierung und verfahren zu ihrer herstellung
DE2350370A1 (de) * 1973-10-08 1975-04-17 Volkswagenwerk Ag Verfahren zum herstellen eines schmiedeteils aus stahl
EP0178222A1 (de) * 1984-10-12 1986-04-16 Ascometal Legierter Stahl, insbesondere für Rohre für Fahrradrahmen
GB2182675A (en) * 1985-09-19 1987-05-20 Man Nutzfahrzeuge Gmbh A method of making components of bainitic steel
EP0370588A1 (de) * 1988-09-16 1990-05-30 MANNESMANN Aktiengesellschaft Verfahren zur Herstellung hochfester nahtloser Stahlrohre

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5144489B2 (de) * 1972-04-21 1976-11-29
US4354882A (en) * 1981-05-08 1982-10-19 Lone Star Steel Company High performance tubulars for critical oil country applications and process for their preparation
JPS6029448A (ja) * 1983-07-29 1985-02-14 Sumitomo Metal Ind Ltd 高温粒子エロ−ジョン環境用鋼
JP2867626B2 (ja) * 1990-06-14 1999-03-08 株式会社東郷製作所 板ばねホースバンドおよびその製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2362878A1 (de) * 1972-12-20 1974-07-04 Bethlehem Steel Corp Bearbeitete (as-worked) bainitische eisenlegierung und verfahren zu ihrer herstellung
DE2350370A1 (de) * 1973-10-08 1975-04-17 Volkswagenwerk Ag Verfahren zum herstellen eines schmiedeteils aus stahl
EP0178222A1 (de) * 1984-10-12 1986-04-16 Ascometal Legierter Stahl, insbesondere für Rohre für Fahrradrahmen
GB2182675A (en) * 1985-09-19 1987-05-20 Man Nutzfahrzeuge Gmbh A method of making components of bainitic steel
EP0370588A1 (de) * 1988-09-16 1990-05-30 MANNESMANN Aktiengesellschaft Verfahren zur Herstellung hochfester nahtloser Stahlrohre

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2727981A1 (fr) * 1994-12-13 1996-06-14 Ascometal Sa Procede de fabrication d'une piece en acier de construction mecanique et piece ainsi fabriquee
EP0717116A1 (de) * 1994-12-13 1996-06-19 ASCOMETAL (Société anonyme) Verfahren zum Herstellen eines Werkstückes aus Maschinenbaustahl und nach diesem Verfahren hergestelltes Werkstück
US5667605A (en) * 1994-12-13 1997-09-16 Ascometal Method of fabrication of a piece of structural steel, and the steel fabricated thereby

Also Published As

Publication number Publication date
FR2679924A1 (fr) 1993-02-05
DE69220304D1 (de) 1997-07-17
DE69220304T2 (de) 1997-10-02
EP0526330B1 (de) 1997-06-11
ES2104869T3 (es) 1997-10-16
FR2679924B1 (fr) 1993-12-10

Similar Documents

Publication Publication Date Title
EP3365172A1 (de) Verbundrohr bestehend aus einem trägerrohr und mindestens einem schutzrohr und verfahren zur herstellung hierfür
FR2477180A1 (fr) Procede de fabrication d'une tole en acier ferritique inoxydable ayant une bonne aptitude a la mise en forme, un bon aspect de surface et une bonne resistance a la corrosion, et tole obtenue
JP2567150B2 (ja) 低温用高強度低降伏比ラインパイプ材の製造法
FR2477179A1 (fr) Acier inoxydable austenitique contenant du cuivre et de l'azote et ses applications a l'obtention de bandes, tubes, barres ou tiges
EP3329026B1 (de) Verfahren zur herstellung von mit innenhochdruck umgeformter rohre aus hochlegiertem stahl
FR2774098A1 (fr) Acier et procede pour la fabrication de pieces de mecanique secables
JPH10251804A (ja) 高強度ばね用鋼
JP3821043B2 (ja) 溶接性に優れた溶融亜鉛系めっき高張力熱延鋼板ならびにその製造方法および加工方法
TW202210637A (zh) 由一鋼組合物製造高強度鋼管及其組件的方法
JP5523288B2 (ja) 高強度中空ばね用シームレス鋼管
EP0845544B1 (de) Stahlprodukt aus bainitischem Stahl sowie Verfahren zur Herstellung des Stahlproduktes
EP0526330B1 (de) Verfahren zum Herstellen dünnwandiger Rohre, Stahl zum Herstellen dieser Rohre und nach diesem Verfahren hergestellte Rohre für Fahrradrahmen
US5257522A (en) Process of hot forging at ultrahigh temperature
EP2257652B1 (de) Herstellungsverfahren von rostfreien austenitischen stahlblechen mit hohen mechanischen eigenschaften
EP0388283A1 (de) Rostfreier ferritischer Stahl und Verfahren zur Herstellung dieses Stahls
EP0493218B1 (de) Förderkette
KR20020034474A (ko) 냉간 압조가공성이 우수한 비조질강의 제조방법
JP2002194431A (ja) 連続鋳造製極厚鋼板の製造方法
FR2777023A1 (fr) Composition d'acier a outils
JPH05171361A (ja) マルテンサイト系ステンレス鋼と製造方法
CN113811625A (zh) 中空稳定器用电阻焊钢管
JP4975448B2 (ja) 靭性に優れた６５５ＭＰａ級マルテンサイト系ステンレス鋼及びその製造方法
JPH10324946A (ja) 鋼管用高強度非調質鋼
JP2000192143A (ja) 均質性に優れた非調質高張力鋼板の製造方法
JP2004027351A (ja) 高強度・高靭性マルテンサイト系ステンレス鋼継目無管の製造方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE ES FR GB IT LU NL

17P Request for examination filed

Effective date: 19921219

17Q First examination report despatched

Effective date: 19941017

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES FR GB IT LU NL

ITF It: translation for a ep patent filed

Owner name: BUGNION S.P.A.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19970612

REF Corresponds to:

Ref document number: 69220304

Country of ref document: DE

Date of ref document: 19970717

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2104869

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19980730

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19990731

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20020618

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20020708

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20020718

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 20020719

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20020723

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20020805

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030729

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030729

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030730

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030731

BERE Be: lapsed

Owner name: *COLUMBUS S.P.A.

Effective date: 20030731

Owner name: *ASCOMETAL

Effective date: 20030731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040203

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20030729

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20040201

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20030730

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050729