EP0413163B2 - Procédé et installation pour la fabrication de produits laminés en acier traités thermomécaniquement - Google Patents

Procédé et installation pour la fabrication de produits laminés en acier traités thermomécaniquement Download PDF

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Publication number
EP0413163B2
EP0413163B2 EP90113828A EP90113828A EP0413163B2 EP 0413163 B2 EP0413163 B2 EP 0413163B2 EP 90113828 A EP90113828 A EP 90113828A EP 90113828 A EP90113828 A EP 90113828A EP 0413163 B2 EP0413163 B2 EP 0413163B2
Authority
EP
European Patent Office
Prior art keywords
temperature
rolled steel
rolling
ferritic
rolled
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 - Lifetime
Application number
EP90113828A
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German (de)
English (en)
Other versions
EP0413163B1 (fr
EP0413163A1 (fr
Inventor
Hugo Dr. Feldmann
Manfred Albedyhl
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.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag 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
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Application filed by SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0413163A1 publication Critical patent/EP0413163A1/fr
Publication of EP0413163B1 publication Critical patent/EP0413163B1/fr
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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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment

Definitions

  • the invention relates to a process for the production of thermomechanically treated steel rolling stock with a circular or annular cross section by means of a planetary cross-rolling mill, the rolling stock being reshaped in a specific temperature range.
  • the austenite structure can therefore be set directly from the casting heat as in direct rolling, or in a preheating furnace from room temperature as in cold use or in an oven from an intermediate temperature as in hot use. In any case, however, prior to the actual thermomechanical treatment of the rolling stock, there is an austenite structure which either contains no or only a small proportion of germs or structural components of the phase which is stable at a lower temperature.
  • the rolling stock is subjected to a powerful reshaping of its two opposite sides in a single wedge-shaped pass through the following incremental reduction steps at high speed.
  • the reduction begins at the beginning of the rolling zone and is carried out along a wedge-shaped transition up to the final dimension of the rolling stock at the end of the rolling zone.
  • a heat loss due to radiation and / or heat conduction is compensated for by deformation work in such a way that the slab is kept at an appropriate temperature within the rolling zone.
  • the heat generated by the deformation work is used to reduce the previous heating.
  • the temperature can be controlled, for example, by means of a controllable ratio between the feed speed and the speed of the sequence of incremental rolling passes.
  • the slab can be heated up to a temperature above the range of blue brittleness, but below the active scaling temperatures. Structural cracks in the rolled product are prevented by applying strictly two-dimensional compressive forces.
  • the rolling stock can be preheated to 400 to 500 ° Celsius or, in the case of ferrous magnetic metal, completely within the magnetic range, ie ⁇ A 1 , or the rolling temperature 816 ° C (1500 ° F ) in the case of low carbon steel. There is no information about the extent of a temperature rise when rolling steel.
  • the object of the invention is to provide a method for the thermomechanical treatment of rolled steel with a circular or annular cross section, which enables the production of rolled products with a particularly favorable combination of strength and toughness properties.
  • the conversion of the ferritic or ferritic-pearlitic initial structure into an austenitic or ferritic-austenitic structure takes place according to the invention under the influence of intensive forming and the associated heating of the rolling stock. Compared to external heating from the outside, when the rolling stock is formed in accordance with the invention, a particularly uniform heating takes place over the entire cross section of the rolling stock.
  • the austenite that forms under these conditions is rich in germs of the phase that is resistant to low temperatures and has a particularly fine-grained structure.
  • the subsequent reverse transformation of the deformed austenite leads to how practice has shown, to an extremely fine-grained structure of the structure with advantageous, significant improvement in strength and toughness properties and the associated substantial increase in the yield strength and impact strength of the rolled product.
  • scaling can be suppressed to such an extent by tapping cold or not heated material up to Ac 1 temperature (Fe-C diagram) that, for example, when rolling steel pipes, the inner surface of the pipe is free of scale otherwise caused by scale Mistakes is.
  • Ac 1 temperature Fe-C diagram
  • this also results in improvements with regard to the surface roughness of the rolled product.
  • the lower preheating temperature and the shorter dwell time at elevated temperatures mean that decarburization is significantly reduced compared to conventionally rolled steel material.
  • the heating of the primary material which may have to be carried out can in this case remain limited to the head of the rolling stock and can take place in gas-heated preheating furnaces or also inductively.
  • the piercing temperature of the rolling stock must be determined depending on the desired degree of forming.
  • This system consists of a preheating unit (I) for the rolling stock, a high-forming unit (II) with a downstream cooling device (III) and a post-rolling or dimensioning mill (IV).
  • the high-forming unit (II) the rolling stock is formed from steel with a circular or annular cross section according to the invention. This results in a significant increase in the yield strength and notched impact strength of the rolled product.
  • a planetary cross-rolling mill is used as the high forming unit.
  • accelerated cooling of the rolling stock with the aid of cooling media such as water can be carried out in the cooling device (III) downstream of the high-forming unit (II). Air or water-air mixture can be made.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (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)
  • Metal Rolling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Claims (1)

  1. Processus de fabrication de matières laminées en acier à section circulaire ou en forme d'anneau de cercle traitées thermomécaniquement par un laminoir planétaire à cylindres obliques,
    caractérisé par le fait que,
    a) avant leur formage les matières laminées ne sont pas chauffées à une température supérieure à Ac1 et ont une texture initiale ferritique ou ferritique-perlitique,
    b) le formage commence à une température correspondant à ces textures initiales - au-dessous de la présence d'une texture austénitique ou ferritique-austénitique, et
    c) sous l'influence du formage des matières laminées et de leur échauffement qui y est lié, la température dans les matières laminées augmente jusque tout juste au-dessus ou tout juste au-dessous de la température de transformation Ac3 de la texture initiale ferritique ou ferritique-perlitique en une texture austénitique.
EP90113828A 1989-08-10 1990-07-19 Procédé et installation pour la fabrication de produits laminés en acier traités thermomécaniquement Expired - Lifetime EP0413163B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3926459 1989-08-10
DE3926459A DE3926459A1 (de) 1989-08-10 1989-08-10 Verfahren und anlage zur herstellung von thermomechanisch behandeltem walzgut aus stahl

Publications (3)

Publication Number Publication Date
EP0413163A1 EP0413163A1 (fr) 1991-02-20
EP0413163B1 EP0413163B1 (fr) 1995-02-15
EP0413163B2 true EP0413163B2 (fr) 1997-11-26

Family

ID=6386881

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90113828A Expired - Lifetime EP0413163B2 (fr) 1989-08-10 1990-07-19 Procédé et installation pour la fabrication de produits laminés en acier traités thermomécaniquement

Country Status (4)

Country Link
EP (1) EP0413163B2 (fr)
JP (1) JPH0372023A (fr)
AT (1) ATE118555T1 (fr)
DE (2) DE3926459A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19725434C2 (de) * 1997-06-16 1999-08-19 Schloemann Siemag Ag Verfahren zum Walzen von Warmbreitband in einer CSP-Anlage
DE19814223A1 (de) 1998-03-31 1999-10-07 Schloemann Siemag Ag Verfahren zur Herstellung von mikrolegierten Baustählen
DE102006045871B4 (de) * 2006-09-28 2010-01-28 Rothe Erde Gmbh Verfahren zur thermomechanischen Behandlung von nahtlos auf Radial-Axial-Ringwalzmaschinen hergestellten Ringen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2710550A (en) * 1954-06-07 1955-06-14 Armzen Company Planetary reducing apparatus and process
GB932462A (en) * 1959-10-30 1963-07-24 United States Steel Corp Method of treating steel to produce a fine-grained structure
DE1272949B (de) * 1962-10-17 1968-07-18 Daido Steel Co Ltd Verfahren und Vorrichtung zur Herstellung von hochzaehen Stahlblechen mit feinem Gefuege und richtungsunabhaengigen Eigenschaften
DE2205657A1 (de) * 1972-02-07 1973-08-23 Vni I Kt I Trubnoj Promy Rohrfertigungsverfahren
DE2338391C3 (de) * 1973-07-28 1978-08-24 Fried. Krupp Huettenwerke Ag, 4630 Bochum Verfahren zum Herstellen von strangförmigem Rundmaterial aus metallischem Werkstoff und Vorrichtung zur Durchführung des Verfahrens
AT366298B (de) * 1976-12-21 1982-03-25 Schloemann Siemag Ag Walzwerksanlage zur herstellung von nahtlosen rohren
FI77057C (fi) * 1987-03-26 1989-01-10 Outokumpu Oy Foerfarande foer framstaellning av roer, staenger och band.

Also Published As

Publication number Publication date
EP0413163B1 (fr) 1995-02-15
EP0413163A1 (fr) 1991-02-20
DE59008465D1 (de) 1995-03-23
ATE118555T1 (de) 1995-03-15
JPH0372023A (ja) 1991-03-27
DE3926459A1 (de) 1991-02-14

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