EP0178222B1 - Legierter Stahl, insbesondere für Rohre für Fahrradrahmen - Google Patents

Legierter Stahl, insbesondere für Rohre für Fahrradrahmen Download PDF

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Publication number
EP0178222B1
EP0178222B1 EP85401923A EP85401923A EP0178222B1 EP 0178222 B1 EP0178222 B1 EP 0178222B1 EP 85401923 A EP85401923 A EP 85401923A EP 85401923 A EP85401923 A EP 85401923A EP 0178222 B1 EP0178222 B1 EP 0178222B1
Authority
EP
European Patent Office
Prior art keywords
steel
tubes
less
weight
bicycle frames
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
Application number
EP85401923A
Other languages
English (en)
French (fr)
Other versions
EP0178222A1 (de
Inventor
Roland De Meyer
Bernard Lantoine
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
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
Application filed by Ascometal SA filed Critical Ascometal SA
Priority to AT85401923T priority Critical patent/ATE36175T1/de
Publication of EP0178222A1 publication Critical patent/EP0178222A1/de
Application granted granted Critical
Publication of EP0178222B1 publication Critical patent/EP0178222B1/de
Expired legal-status Critical Current

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Classifications

    • 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

Definitions

  • the present invention relates to an alloy steel intended for heat treatments and usable, in particular, for cycle tubes.
  • An alloy steel is known under the name AFNOR 25CD4, the theoretical composition of which is: 0.25% carbon, 0.75% manganese, 0.25% silicon, 1% chromium, 0.22% molybdenum, less 0.035% phosphorus, less than 0.035% sulfur, the balance being formed by iron and the usual impurities.
  • the reference heat treatment consists of quenching at 860 ° C and tempering at 550 ° C.
  • a steel of this type is used for tubes of cycle frames. This steel must be brazed when the frames are manufactured. We seek to lighten the frames as much as possible and we need steels with maximum tensile strength.
  • the present invention aims to provide a steel derived from a steel of the previous type and having improved tensile strength.
  • the invention provides an alloy steel with dispersoids which, in addition to a good tensile strength, has a remarkable ability to deformation in hot and cold and a good ability to braze.
  • the desired objective is achieved by a steel resistant to traction and to fatigue and having good brazing properties, comprising by weight, 0.23 to 0.29% of carbon, 0.23 to 0.28% of silicon, 0.15 to 0.25% molybdenum, less than 0.035% phosphorus, less than 0.035% sulfur, 1 to 1.35% manganese, 0.20 to 0.40% chromium, 0.08 to 0 , 15% vanadium, optionally up to 0.1% copper, up to 0.01% tin or 0.01 to 0.02% aluminum, the balance being formed by iron and impurities usual.
  • the carbon content is between 0.23 and 0.29% by weight.
  • the steel contains manganese in a proportion of between 1 and 1.35% and preferably between 1.10 and 1.20%. This element strengthens the tensile strength.
  • the phosphorus or sulfur content does not exceed 0.035%.
  • the steel contains chromium with a content of between 0.20 and 0.40% and preferably between 0.25 and 0.30%.
  • the steel contains molybdenum with a content of between 0.15 and 0.25%.
  • the steel contains vanadium with a content of between 0.08 and 0.15% and preferably between 0.08 and 0.12%. This element gives steel an improved tensile strength by forming ultrafine precipitates (dispersoids).
  • the silicon content is between 0.23 and 0.28%.
  • the nickel content is less than 0.20%.
  • Aluminum is added to the steel so that the final aluminum content is between 0.01 and 0.02%. This addition is carried out in the form of a wire, in an ingot mold. Aluminum acts as a fine grain stabilizer without having a role of deoxidizer.
  • Steel can contain residual elements such as copper and tin.
  • the maximum tolerated content is 0.1% for copper and 0.01% for tin.
  • the heat treatment of the steel according to the invention corresponds substantially to the reference heat treatment of 25CD4 steel.
  • This standard heat treatment consists of quenching at around 860 ° C and tempering at around 550 ° C.
  • the steel grades A and B above were tested by tensile strength, fatigue and brazing tests.
  • the steels according to the invention have good tensile strength. This tensile strength is of the order of 860 N / mm 2 .
  • 25CD4 steel has a tensile strength of the order of 760 N / mm2.
  • the steels according to the invention exhibit remarkable resistance to fatigue.
  • the steels according to the invention are entirely suitable for brazing because they allow overheating up to 1100/1200 ° C without altering the mechanical properties.
  • the steel according to the invention is particularly suitable for manufacturing tubes intended for the manufacture of cycle frames.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)
  • Motorcycle And Bicycle Frame (AREA)

Claims (6)

1. Stahl, welcher in Gewichtsprozent 0,23 bis 0,29% Kohlenstoff, 0,23 bis 0,28% Silizium, 0,15 bis 0,25% Molybdän, weniger als 0,035% Phosphor, weniger als 0,035% Schwefel, 1 bis 1,35% Mangan, 0,20 bis 0,40% Chrom, 0,08 bis 0,15% Vanadium, fakultativ bis 0,1 % Kupfer, bis 0,01 % Zinn oder 0,01-0,02% Aluminium, wobei der Rest durch Eisen und übliche Verunreinigungen gebildet ist, aufweist.
2. Stahl nach Anspruch 1, dadurch gekennzeichnet, dass er 1 bis 1,20% Mangan, 0,25 bis 0,30% Chrom, 0,08 bis 0,12% Vanadium aufweist.
3. Stahl nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass er in Gewichtsprozent bis 0,1 % Kupfer und bis 0,01 % Zinn aufweist.
4. Stahl nach irgendeinem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass er in Gewichtsprozenten 0,01 bis 0,02% Aluminium aufweist.
5. Verwendung eines Stahls nach irgendeinem der vorstehenden Ansprüche zur Herstellung von Rohren für Fahrradrahmen.
EP85401923A 1984-10-12 1985-10-02 Legierter Stahl, insbesondere für Rohre für Fahrradrahmen Expired EP0178222B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401923T ATE36175T1 (de) 1984-10-12 1985-10-02 Legierter stahl, insbesondere fuer rohre fuer fahrradrahmen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8415665A FR2571741B1 (fr) 1984-10-12 1984-10-12 Acier allie pour, notamment, des tubes de cycles
FR8415665 1984-10-12

Publications (2)

Publication Number Publication Date
EP0178222A1 EP0178222A1 (de) 1986-04-16
EP0178222B1 true EP0178222B1 (de) 1988-08-03

Family

ID=9308603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401923A Expired EP0178222B1 (de) 1984-10-12 1985-10-02 Legierter Stahl, insbesondere für Rohre für Fahrradrahmen

Country Status (4)

Country Link
EP (1) EP0178222B1 (de)
AT (1) ATE36175T1 (de)
DE (1) DE3564134D1 (de)
FR (1) FR2571741B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2679924B1 (fr) * 1991-07-30 1993-12-10 Ascometal 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.
EP2128299B1 (de) 2008-05-29 2016-12-28 General Electric Technology GmbH Mehrlagige Wärmedämmschicht

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798805A (en) * 1954-09-03 1957-07-09 United States Steel Corp Wrought railroad wheels made of alloy steels
BE642215A (de) * 1963-01-09
CA952415A (en) * 1970-05-20 1974-08-06 Eiji Miyoshi Process and apparatus for manufacture of strong tough steel plates

Also Published As

Publication number Publication date
EP0178222A1 (de) 1986-04-16
ATE36175T1 (de) 1988-08-15
FR2571741A1 (fr) 1986-04-18
FR2571741B1 (fr) 1987-01-23
DE3564134D1 (en) 1988-09-08

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