EP0262281B1 - Procédé de production de tubes pour utilisation à températures jusqu'à moins 40 degrés Celsius - Google Patents

Procédé de production de tubes pour utilisation à températures jusqu'à moins 40 degrés Celsius Download PDF

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Publication number
EP0262281B1
EP0262281B1 EP19860730149 EP86730149A EP0262281B1 EP 0262281 B1 EP0262281 B1 EP 0262281B1 EP 19860730149 EP19860730149 EP 19860730149 EP 86730149 A EP86730149 A EP 86730149A EP 0262281 B1 EP0262281 B1 EP 0262281B1
Authority
EP
European Patent Office
Prior art keywords
temperature
room temperature
carried out
sectional
cold working
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
EP19860730149
Other languages
German (de)
English (en)
Other versions
EP0262281A1 (fr
Inventor
Ingo Dr.-Ing. Von Hagen
Axel Dr.-Mont. Kulgemeyer
Helmut Schillians
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Priority to EP19860730149 priority Critical patent/EP0262281B1/fr
Priority to DE8686730149T priority patent/DE3663263D1/de
Priority to FI873095A priority patent/FI83045C/fi
Publication of EP0262281A1 publication Critical patent/EP0262281A1/fr
Application granted granted Critical
Publication of EP0262281B1 publication Critical patent/EP0262281B1/fr
Expired 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
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0028—Drawing the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Definitions

  • the invention relates to a method for producing cylinder tubes for use at temperatures down to minus 40 degrees Celsius.
  • the object of the invention is a method for producing cylinder tubes with a yield strength of over 750 N / mm 2 for use at temperatures down to minus 40 degrees C.
  • the task is solved by a method with the characteristic features of the main claim. While it is not possible to take measures according to the state of the art, e.g. B. by extensive heat treatment of the finished product to increase the yield strength to a desirable level, it is surprisingly shown that the notched impact strength at low temperatures and the elongation at break do not decrease to the same extent as the yield strength due to the cold forming of the normalized structure according to the current proposal.
  • the degree of cold forming makes it possible to achieve the minimum yield strength of 750 N / mm2 and sufficient notched impact strengths for the temperature down to minus 40 degrees C for the respective application.
  • the cold forming can be provided in two stages according to the proposal. This measure is proposed if strength and notched impact strength values are to be achieved beyond the minimum values mentioned. In this case, normalization annealing must also be inserted before the second stage. On the other hand, in the second stage, the desired values are already achieved through smaller transformations, because this stage has a finer initial structure.
  • the cold forming can be carried out by rolling or drawing or partly by one and partly by the other method.
  • the normalization temperature is cooled in air or water.
  • the use of the pipes manufactured according to the described method in the finished dimensions for cylinder tubes, as are used in hydraulic drives, is claimed if these have a yield strength of at least 750 N / mm 2 and a notched impact energy of at least 100 J at minus 20 degrees C. should own and thus z. B. be used on earthmoving machines at temperatures down to minus 40 degrees C.
  • the impact energy is determined on ISO-V longitudinal samples.
  • the rest of the iron and usual impurities are hot-formed in a conventional hot production process to form a 225 x 34 mm front pipe and then cooled in air to room temperature.
  • the front pipe is then normalized at 920 degrees C and cooled in air.
  • the front pipe is cold formed to the intermediate dimension of 180 x 29.75 mm without intermediate heat treatment.
  • the total change in cross-section corresponds to approx. 40%.
  • the present intermediate dimension is normalized at 940 degrees C with subsequent water quenching and cold-formed by plug pulls without intermediate heat treatment with individual cross-sectional changes of up to 9% and a total cross-sectional change of 33% to the finished pipe dimension 155 x 19 mm.
  • a notched bar impact work of 197 J is determined on longitudinal ISO-V samples at minus 40 degrees Celsius.
  • the tube has an Rpo, 2 yield strength of 852 N / mm 2 , a tensile strength of 888 N / mm 2 and an As elongation of 15% at room temperature.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)

Claims (8)

1. Procédé pour réaliser des tubes cylindriques ayant une limite d'élasticité supérieure à 750 N/mm2, utilisables à des températures jusqu'à -40°C, dans lequel on réalise un pré-tube en acier ayant 0,02-0,1% de carbone, 0,005-0,25% de silicium, 1,5-2,0% de manganèse, 2-4% de nickel, 0,03-0,06% de niobium et du fer avec les impuretés habituelles, par formage à chaud et refroidissement à l'air à température ambiante, caractérisé en ce que le pré-tube subit un traitement thermique de normalisation à 900-950°C, est refroidi à température ambiante et, dans la plage de températures de la température ambiante à 100°C, est formé à froid avec diminution de section transversale d'environ 15 à 80% à la dimension finale.
2. Procédé selon la revendication 1, caractérisé en ce que le tube cylindrique ayant la dimension du tube fini est soumis à un traitement thermique de revenu à une température entre 300 et 500°C.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le formage à froid pour obtenir la dimension finale a lieu en une première étape avec diminution de section transversale d'environ 20-50% en totalité et une normalisation suivant à 900-950°C avec refroidissement subséquent à température ambiante, et en une seconde étape avec une diminution de section transversale d'environ 5-60% en totalité.
4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que le formage à froid a lieu au moins partiellement par laminage avec des réductions de section transversale de 20-70% pour chaque passe.
5. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que le formage à froid a lieu au moins partiellement par étirage avec des réductions de section transversale de 5-50% pour chaque passe.
6. Procédé selon une des revendications 1 à 5 précédentes, caractérisé en ce que le refroidissement de la température de normalisation à la température ambiante a lieu à l'air.
7. Procédé selon une des revendications 1 à 5 précédentes, caractérisé en ce que le refroidissement de la température de normalisation à la température ambiante a lieu dans l'eau.
8. Utilisation d'un acier pour des tubes cylindriques, qui comporte 0,02-0,1% de carbone, 0,05-0,25% de silicium, 1,5-2,0% de manganèse, 2-4% de nickel, 0,03-0,06% de niobium et du fer avec les impuretés habituelles, à partir duquel, par formage à chaud, sont créés des pré-tubes, qui sont soumis à un traitement thermique de normalisation à une température entre 900-950°C et à un formage à froid suivant avec réduction de section transversale d'environ 15-70% en totalité à la dimension finale, le formage à froid ayant lieu en deux étapes d'à chaque fois au moins 15% de réduction en totalité de la section transversale et comportant un traitement thermique de normalisation entre elles et un revenu subséquent à une température entre 300 et 500°C.
EP19860730149 1986-09-25 1986-09-25 Procédé de production de tubes pour utilisation à températures jusqu'à moins 40 degrés Celsius Expired EP0262281B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19860730149 EP0262281B1 (fr) 1986-09-25 1986-09-25 Procédé de production de tubes pour utilisation à températures jusqu'à moins 40 degrés Celsius
DE8686730149T DE3663263D1 (en) 1986-09-25 1986-09-25 Process for the production of tubes for use at temperatures up to minus 40 degrees celsius
FI873095A FI83045C (fi) 1986-09-25 1987-07-13 Foerfarande foer framstaellning av cylinderroer avsedda foer anvaendning i temperaturer till -40 c och anvaendning av staol i cylinderroer.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19860730149 EP0262281B1 (fr) 1986-09-25 1986-09-25 Procédé de production de tubes pour utilisation à températures jusqu'à moins 40 degrés Celsius

Publications (2)

Publication Number Publication Date
EP0262281A1 EP0262281A1 (fr) 1988-04-06
EP0262281B1 true EP0262281B1 (fr) 1989-05-10

Family

ID=8196444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860730149 Expired EP0262281B1 (fr) 1986-09-25 1986-09-25 Procédé de production de tubes pour utilisation à températures jusqu'à moins 40 degrés Celsius

Country Status (3)

Country Link
EP (1) EP0262281B1 (fr)
DE (1) DE3663263D1 (fr)
FI (1) FI83045C (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006083963A (ja) * 2004-09-16 2006-03-30 Ntn Corp 中空状動力伝達シャフト
FR3035129B1 (fr) * 2015-04-20 2019-05-10 Societe Civile De Brevets Matiere Procede de realisation d'armatures pour beton arme

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2184624A (en) * 1937-12-03 1939-12-26 Nat Tube Co Manufacture of steel or alloy tubes
US2235243A (en) * 1939-03-27 1941-03-18 Republic Steel Corp Ferrous metal article and method of producing same
US3619302A (en) * 1968-11-18 1971-11-09 Yawata Iron & Steel Co Method of heat-treating low temperature tough steel
JPS5411774B2 (fr) * 1973-02-15 1979-05-17
DE2847506C2 (de) * 1978-11-02 1986-04-17 Stahlwerke Peine-Salzgitter Ag, 3150 Peine Verwendung eines kaltzähen Mangan-Nickel-Feinkornbaustahls

Also Published As

Publication number Publication date
FI873095A (fi) 1988-03-26
FI873095A0 (fi) 1987-07-13
FI83045B (fi) 1991-02-15
FI83045C (fi) 1991-05-27
EP0262281A1 (fr) 1988-04-06
DE3663263D1 (en) 1989-06-15

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