EP0185341A2 - Procédé pour augmenter la résistance des aciers à béton - Google Patents

Procédé pour augmenter la résistance des aciers à béton Download PDF

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Publication number
EP0185341A2
EP0185341A2 EP85116005A EP85116005A EP0185341A2 EP 0185341 A2 EP0185341 A2 EP 0185341A2 EP 85116005 A EP85116005 A EP 85116005A EP 85116005 A EP85116005 A EP 85116005A EP 0185341 A2 EP0185341 A2 EP 0185341A2
Authority
EP
European Patent Office
Prior art keywords
temperature
steel
strength
cooled
seconds
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
EP85116005A
Other languages
German (de)
English (en)
Other versions
EP0185341A3 (en
EP0185341B2 (fr
EP0185341B1 (fr
Inventor
Ernst Dr.-Ing. Günther
Klaus Dipl.-Ing. Fischer
Jochen Dipl.-Ing. Schmidt
Norbert Dr.-Ing. Brennecke
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.)
SKET Walzwerkstechnik GmbH
Original Assignee
VEB STAHL- und WALZWERK BRANDENBURG
BRANDENBURG STAHL WALZWERK
SKET Schwermaschinenbau Magdeburg GmbH
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.)
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=5563382&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0185341(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by VEB STAHL- und WALZWERK BRANDENBURG, BRANDENBURG STAHL WALZWERK, SKET Schwermaschinenbau Magdeburg GmbH filed Critical VEB STAHL- und WALZWERK BRANDENBURG
Priority to AT85116005T priority Critical patent/ATE67793T1/de
Publication of EP0185341A2 publication Critical patent/EP0185341A2/fr
Publication of EP0185341A3 publication Critical patent/EP0185341A3/de
Application granted granted Critical
Publication of EP0185341B1 publication Critical patent/EP0185341B1/fr
Publication of EP0185341B2 publication Critical patent/EP0185341B2/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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement

Definitions

  • the invention relates to a method for increasing the strength of reinforcing steels.
  • the process is particularly suitable for increasing the strength of ribbed reinforcing steel, which is produced as wire rod in the form of coils on continuous high-performance wire mills, in which the wire emerging at high speed from the last roll stand is fanned out by a rotating laying tube in non-concentric turns on a winding conveyor becomes.
  • These steels achieve the required strength properties due to their alloy content and are used in the rolled state. They are therefore also referred to as naturally hard steels.
  • the alloy basis of the naturally hard steels is formed by the elements C, Si and Mn.
  • the content of these elements cannot be increased arbitrarily, so that, depending on the requirements for weldability, high yield strength values of e.g. B. 400 to 500 MPa or above can only be realized by adding precipitation hardening alloy elements such as V, Ti or Nb.
  • precipitation hardening alloy elements such as V, Ti or Nb.
  • micro-alloying elements are very expensive and are subject to constant price increases, so that the cost of steel production increases considerably when micro-alloying elements are added.
  • the effect of the microalloy elements to increase the strength can be combined with a high temperature thermomechanical treatment (HTMB) with conversion in the pearlite stage or a controlled cooling in which the wire rod is cooled at a predetermined speed up to and through the temperature range of the pearlite stage transformation.
  • HTMB high temperature thermomechanical treatment
  • the rolling process is divided into a roughing and finish rolling phase, the finish rolling with a predetermined degree of deformation in the lower austenite area, i.e. H. in the temperature range of about 900 - 750 ° C
  • a partial remuneration from the rolling heat is achieved in that the steel passes through a water cooling section arranged in the technological line of the rolling mill immediately after the last rolling pass, the areas near the surface being quenched by intensive pressurized water cooling to below the martensite point and then in the course of the subsequent temperature compensation the heat remaining in the core is tempered to a certain compensation temperature.
  • the steel treated in this way has a concentric edge zone made of tempering structure (high-tempered martensite and / or bainite) and a ferritic-pearlitic core.
  • a transition zone composed of a mixture of the two microstructures can be arranged between the edge and the core.
  • the yield strength or tensile strength of the partially tempered steels depends on the area share of the different structures in the total cross section of the rolled stock. So z. B. To ensure a minimum yield strength of 500 MPa, the area share of the tempered edge zone in the total cross section is at least 30 - 40%.
  • Partially tempered rebars are produced from 8 mm nominal diameter on fine steel mills as bar steel at rolling speeds up to a maximum of about 20 m / s.
  • the aim of the invention is to use a process to be developed to reduce the alloying effort for the production of high-strength reinforcing steels with good weldability and coformability and thus to significantly reduce the manufacturing costs compared to the solutions known for continuous high-performance wire mills.
  • the invention has for its object to develop a method for increasing the strength, in particular the yield strength of reinforcing steels while ensuring good weldability and good plastic properties.
  • the process is said to be suitable for the production of ribbed reinforcing steel as coiled wire in the form of a coil, preferably on continuous high-performance wire mills, in which the wire emerging from the last mill stand at high speed is fanned out by a rotating laying tube in non-concentric turns on a winding conveyor.
  • the object is achieved in that the steel, for. B. wire rod, in the final phase of the hot rolling process in a predetermined period of time, which must not be significantly exceeded, with a be certain shape change (decrease in cross-section) is formed and immediately after the forming very quickly to a temperature below the recrystallization temperature of the austenite, but above the A r, transformation temperature, so that at the beginning of the ⁇ - ⁇ conversion a finely or incompletely recrystallized Austenite structure is present.
  • the forming in the final phase of the hot rolling process which can be carried out in one or more passes, must be at least 60% and take place in less than 1 second and the steel, e.g. B. wire rod, in less than 2 seconds to the above.
  • Temperature range which is between about 850 and 600 ° C can be cooled and left in this temperature range until the ⁇ - ⁇ conversion is largely completed.
  • the cooling down to the temperature range between the recrystallization temperature of the austenite and the A r, transformation temperature can also take place so abruptly that a concentric edge zone of hardening structure (martensite and / or bainite) forms and the predetermined temperature only develops in the course of the subsequent temperature compensation between the edge and the core, leaving the hardened edge zone high.
  • the cooling down to the temperature range between the recrystallization temperature of the austenite and the A r, transformation temperature can also take place in such a way that complete transformation in the pearlite stage is ensured.

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 Steel (AREA)
EP85116005A 1984-12-17 1985-12-16 Procédé pour augmenter la résistance des aciers à béton Expired - Lifetime EP0185341B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85116005T ATE67793T1 (de) 1984-12-17 1985-12-16 Verfahren zur erhoehung der festigkeit von bewehrungsstaehlen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD270878 1984-12-17
DD84270878A DD231577B1 (de) 1984-12-17 1984-12-17 Verfahren zur erhoehung der festigkeit von bewehrungsstaehlen

Publications (4)

Publication Number Publication Date
EP0185341A2 true EP0185341A2 (fr) 1986-06-25
EP0185341A3 EP0185341A3 (en) 1988-10-05
EP0185341B1 EP0185341B1 (fr) 1991-09-25
EP0185341B2 EP0185341B2 (fr) 1999-02-10

Family

ID=5563382

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85116005A Expired - Lifetime EP0185341B2 (fr) 1984-12-17 1985-12-16 Procédé pour augmenter la résistance des aciers à béton

Country Status (4)

Country Link
EP (1) EP0185341B2 (fr)
AT (1) ATE67793T1 (fr)
DD (1) DD231577B1 (fr)
DE (1) DE3584235D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT501551B1 (de) * 2005-03-07 2008-03-15 Evg Entwicklung Verwert Ges Verfahren und anlage zum herstellen von hochduktilem stahldraht aus warmgewalztem walzdraht

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1433757A1 (de) * 1961-01-23 1968-11-28 Matuschka Dr Mont Dipl Ing Ber Feinkoerniger Baustahl und Verfahren zu seiner Herstellung
DD149943A1 (de) * 1980-03-31 1981-08-05 Ernst Guenther Verfahren zur herstellung von hochfesten schweissbaren betonstaehlen
DE2900271C2 (de) * 1979-01-05 1984-01-26 Stahlwerke Peine-Salzgitter Ag, 3150 Peine Schweißbarer Betonstahl und Verfahren zu seiner Herstellung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1433757A1 (de) * 1961-01-23 1968-11-28 Matuschka Dr Mont Dipl Ing Ber Feinkoerniger Baustahl und Verfahren zu seiner Herstellung
DE2900271C2 (de) * 1979-01-05 1984-01-26 Stahlwerke Peine-Salzgitter Ag, 3150 Peine Schweißbarer Betonstahl und Verfahren zu seiner Herstellung
DD149943A1 (de) * 1980-03-31 1981-08-05 Ernst Guenther Verfahren zur herstellung von hochfesten schweissbaren betonstaehlen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
STEEL IN THE USSR, Band 7, Nr. 8, August 1977, Seiten 464-466, London, GB; V. Y. SAVENKOV et al.: "Quenching and tempering of reinforcing steel rod at krivoi rog works" *

Also Published As

Publication number Publication date
EP0185341A3 (en) 1988-10-05
DD231577A1 (de) 1986-01-02
EP0185341B2 (fr) 1999-02-10
ATE67793T1 (de) 1991-10-15
DD231577B1 (de) 1987-09-09
EP0185341B1 (fr) 1991-09-25
DE3584235D1 (de) 1991-10-31

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