EP0166239B1 - Verfahren zur Herstellung von Betonstahl in Form von Stäben oder Walzdraht - Google Patents

Verfahren zur Herstellung von Betonstahl in Form von Stäben oder Walzdraht Download PDF

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Publication number
EP0166239B1
EP0166239B1 EP85106499A EP85106499A EP0166239B1 EP 0166239 B1 EP0166239 B1 EP 0166239B1 EP 85106499 A EP85106499 A EP 85106499A EP 85106499 A EP85106499 A EP 85106499A EP 0166239 B1 EP0166239 B1 EP 0166239B1
Authority
EP
European Patent Office
Prior art keywords
steel
percent
rolling
reinforcing steel
vanadium
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
EP85106499A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0166239A1 (de
Inventor
Emil Dr. Elsner
Horst Brehmer
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.)
Stahl- und Walzwerke Gerlafingen AG
Von Roll Holding AG
Original Assignee
Von Roll 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4239054&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0166239(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Von Roll AG filed Critical Von Roll AG
Priority to AT85106499T priority Critical patent/ATE46720T1/de
Publication of EP0166239A1 publication Critical patent/EP0166239A1/de
Application granted granted Critical
Publication of EP0166239B1 publication Critical patent/EP0166239B1/de
Expired 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • 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 process for the production of reinforcing steel in the form of bars or wire rod with a low carbon equivalent and with micro-alloying elements vanadium 0.03-0.05% and nitrogen 0.01-0.02% and with a yield strength of at least 450 N / mm 2 and with good weldability and toughness.
  • good welding properties are understood to mean the suitability of such reinforcing steels for the welding processes customary here, such as, for example, manual electric arc welding, protective gas welding, flash butt welding and resistance spot welding.
  • a measure for the assessment of the weldability is the carbon content or the carbon equivalent, which values should be as low as possible.
  • FR-A 2103905 discloses a reinforcing steel which has a composition which is used for the known high-strength, weldable fine-grain structural steels. Such steel can be used as reinforcing steel. Since this steel is not subjected to any thermal or mechanical treatment, it additionally requires alloy components, with regard to which this steel is more expensive than e.g. B. a rebar tempered from the rolling heat.
  • This object is achieved according to the invention by the reinforcing steel described at the outset, the steel being quenched during and / or after rolling from the rolling heat and its surface cooled thereby to a temperature greater than 600 ° C. is reheated by the higher temperature of its core, so that a steel compensation temperature of over 700 ° C to a maximum of 760 ° C is reached.
  • the upper compensation temperature is determined by the gamma-alpha transition temperature (A, 3 point).
  • the A, 3 point depends on the austenitizing temperature and in particular on the steel composition. In the example given, it is around 825 ° C.
  • the gamma-alpha conversion should also take place as quickly as possible in the core. It is therefore expedient to control the cooling in such a way that on the one hand the gamma-alpha conversion in the core is accelerated, but on the other hand the temperature of the rod surface does not drop below the M s point, 450 ° C. in the example given. Compensation temperatures up to 760 ° C have proven to be well applicable.
  • the average heat flux density was determined as a measure of the controlled cooling, which was approximately 11 MW / m 2 for the rod diameters of 8-12 mm and approximately 6 MW / m 2 for the rod diameter 20 mm.
  • the mean heat flow density is understood to mean the amount of heat dissipated by the cooling medium, based on the rod surface cooled in the cooling system during the cooling time.
  • test results show that with controlled cooling, despite the low carbon equivalent and the low content of microalloying elements (vanadium and nitrogen), the high stretch required limits of reinforcing steel equal to or greater than 500 N / mm 2 can be set easily and inexpensively.
  • a vanadium content of 0.04% with a nitrogen content of 0.012% (120 ppm) is sufficient for this; an increase in the vanadium content to 0.06% has only a comparatively minor effect.
  • the method can also be applied to products and / or types of steel other than reinforcing steel in bars or wire rod, e.g. B. on steel bars and flat products.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
EP85106499A 1984-05-30 1985-05-25 Verfahren zur Herstellung von Betonstahl in Form von Stäben oder Walzdraht Expired EP0166239B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85106499T ATE46720T1 (de) 1984-05-30 1985-05-25 Verfahren zur herstellung von betonstahl in form von staeben oder walzdraht.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2675/84 1984-05-30
CH2675/84A CH681603A5 (xx) 1984-05-30 1984-05-30

Publications (2)

Publication Number Publication Date
EP0166239A1 EP0166239A1 (de) 1986-01-02
EP0166239B1 true EP0166239B1 (de) 1989-09-27

Family

ID=4239054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85106499A Expired EP0166239B1 (de) 1984-05-30 1985-05-25 Verfahren zur Herstellung von Betonstahl in Form von Stäben oder Walzdraht

Country Status (5)

Country Link
US (1) US4594113A (xx)
EP (1) EP0166239B1 (xx)
AT (1) ATE46720T1 (xx)
CH (1) CH681603A5 (xx)
DE (1) DE3573276D1 (xx)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD287735A5 (de) * 1989-09-06 1991-03-07 ���@�����`@���@��������@ �K@������ @�����������k�� Waermebehandelter stahl mit verbesserten mechanisch-technologischen werkstoffeigenschaften
US5122199A (en) * 1991-07-12 1992-06-16 General Motors Corporation Copper brazed torque converter pump housing made from formable high strength microalloyed steel
FR2684691B1 (fr) * 1991-12-04 1995-06-09 Unimetall Sa Procede de fabrication en continu d'un fil en acier en defilement notamment d'un fil pour le renforcement du beton.
US6395109B1 (en) 2000-02-15 2002-05-28 Cargill, Incorporated Bar product, cylinder rods, hydraulic cylinders, and method for manufacturing
CN106734191A (zh) * 2016-12-26 2017-05-31 江苏省沙钢钢铁研究院有限公司 一种减少低碳含硼钢盘条返废率的轧制工艺

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE737682A (en) * 1969-08-19 1970-02-19 Wire rod manufacturing process
DE2123687C3 (de) * 1971-05-13 1978-10-05 Baustahlgewebe Gmbh, 4000 Duesseldorf Kontinuierliches Wärmebehandlungsverfahren an stabförmigen, niedriggekohlten Baustählen
LU61472A1 (xx) * 1970-08-04 1972-04-05
JPS5420931B2 (xx) * 1973-09-10 1979-07-26
US3900347A (en) * 1974-08-27 1975-08-19 Armco Steel Corp Cold-drawn, straightened and stress relieved steel wire for prestressed concrete and method for production thereof
BE824960A (fr) * 1975-01-29 1975-07-29 Procede d'amelioration de la qualite des produits en acier lamines
NL7610472A (nl) * 1975-09-30 1977-04-01 Arbed Werkwijze voor de behandeling van gewalst staal.
US4060428A (en) * 1976-07-30 1977-11-29 Morgan Construction Company Process for forming ferrous billets into finished product
SE404703C (sv) * 1976-09-20 1986-02-20 Garphytte Bruk Ab Ventilfjedertrad av laglegerat stal
DE2717780B2 (de) * 1977-04-21 1979-11-29 Hamburger Stahlwerke Gmbh, 2103 Hamburg Herstellung von Walzdraht
DE2820323A1 (de) * 1977-05-13 1978-11-23 Arbed Verfahren zur herstellung von stahlprofilen mit verbesserter qualitaet
BE889575A (fr) * 1981-07-09 1982-01-11 Centre Rech Metallurgique Procede pour la fabrication d'armatures a beton en acier, a proprietes ameliorees.

Also Published As

Publication number Publication date
DE3573276D1 (en) 1989-11-02
EP0166239A1 (de) 1986-01-02
CH681603A5 (xx) 1993-04-30
ATE46720T1 (de) 1989-10-15
US4594113A (en) 1986-06-10

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