EP0301228B1 - Procédé de fabrication de feuillard laminé à chaud - Google Patents

Procédé de fabrication de feuillard laminé à chaud Download PDF

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Publication number
EP0301228B1
EP0301228B1 EP88109771A EP88109771A EP0301228B1 EP 0301228 B1 EP0301228 B1 EP 0301228B1 EP 88109771 A EP88109771 A EP 88109771A EP 88109771 A EP88109771 A EP 88109771A EP 0301228 B1 EP0301228 B1 EP 0301228B1
Authority
EP
European Patent Office
Prior art keywords
rolled strip
rolling
hot
hot rolled
coil
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
EP88109771A
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German (de)
English (en)
Other versions
EP0301228A1 (fr
Inventor
Cestmir Dr. Dipl.-Ing. Lang
Lutz Dr. Dipl.-Ing. Meyer
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.)
Thyssen Stahl AG
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Thyssen Stahl AG
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Application filed by Thyssen Stahl AG filed Critical Thyssen Stahl AG
Priority to AT88109771T priority Critical patent/ATE67792T1/de
Publication of EP0301228A1 publication Critical patent/EP0301228A1/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
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • 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
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/68—Furnace coilers; Hot coilers

Definitions

  • Hot strip from these steels is used for direct further processing by forming or for the production of cold-rolled strip. Finished parts made from these steels are usually heat-treated by hardening and tempering to set the required strength and hardness values.
  • the tensile strength of hot strip made from these steels is high due to the carbon content. It depends on the pearlite content in the structure and on the formation of pearlite. In the case of steels with carbon contents between 0.4 and 0.7%, an increase in the pearlite content in the structure of 50-100% causes an increase in the tensile strength of 600 to 1100 N / mm2 (Journal of the Iron and Steel Institute, 205, 1967, page 653/664). There is an increase in the pearlite content in the structure with a reduction in the amount of ferrite if the cooling rate of the strip is high in the region of the ⁇ / ⁇ conversion.
  • Cooling rate in the area of the ⁇ / ⁇ conversion is the lamellar spacing of the pearlitic structure and thus also the strength.
  • increasing the cooling rate from 5 to 30 K / s reduces the lamellar spacing of the pearlite and thereby increases the tensile strength from 950 to 1300 N / mm2 (Atlas for heat treatment of Staehle, Verlag Stahl-Eisen, Duesseldorf, 1961, Plate II - 101 E and Mem.Sci.Revue de Metallurgie 75, 1978, pages 149/159).
  • the average lamella spacing of pearlite is between 0.1 and 0.2 ⁇ m.
  • the high strength means that the resulting high forming forces place a high load on the systems. This entails both increased energy consumption and a reduction in the lifespan of the systems.
  • the primary goal in the method according to the invention is the lamellar spacing of the pearlite, i.e. of the structural component, which accounts for more than half of the microstructure formation in the pearlitic-ferritic steels in question, and thereby lower the tensile strength.
  • the invention has for its object to reduce the tensile strength of hot strip from unalloyed or low-alloy steel with 0.3 to 0.9% C, without affecting the uniformity of the properties and structure over the length and width of the hot strip.
  • This object is achieved according to the invention by a method which is characterized in that the hot rolling and the cooling of the hot strip on the run-out roller table are controlled such that the ⁇ / ⁇ conversion in the hot strip only begins in the coiled coil and is ended in the coil.
  • the process according to the invention makes use of the fact that pearlitic-ferritic steels have a low temperature at the start of the ⁇ / ⁇ conversion on cooling and that a temperature increase occurs during the conversion into the pearlite stage.
  • the process according to the invention is carried out in such a way that the ⁇ / ⁇ conversion in the hot strip, which previously took place on the exit roller table of the hot strip mill, is shifted into the coil.
  • this solution means a coarsening of the pearlitic structure.
  • the lamellar spacing of pearlite is about twice as high as that of the structure with fine-lamellar pearlite.
  • the ferrite content in the structure is increased and thus the pearlite content is lowered. Both structural changes contribute to a reduction in the strength of the hot strip.
  • the already mentioned phenomenon contributes to a good uniformity of the properties and the microstructure formation according to the invention, according to which steels with a higher carbon content show a strong heat development during the transformation in the pearlite stage.
  • the heating for a steel with approximately 0.35% C is 20 to 30 K and for a steel with approximately 0.8% C 40 to 60 K.
  • the production steps are carried out in such a way that the ⁇ / ⁇ conversion in the hot strip only begins in the coiled coil and ends in the coil.
  • the heat development in the coil leads to an equalization of the temperature of the wound strip up to the outer and inner turns of the coil and at the same time to a decrease in the cooling rate in the area of the ⁇ / ⁇ conversion with the described consequences for the reduced strength of the hot strip.
  • the uniformity of the properties and the structure formation impaired. Furthermore, the winding state of the tape is negatively influenced by an undefined course of the conversion over the length of the tape.
  • a low tensile strength of 500 to 780 N / mm2 and a coarse-lamellar pearlite formation (average lamellar spacing of the pearlite greater than 0.3 ⁇ m) of the hot strip is achieved according to the invention when the cooling rate in the range of the ⁇ / ⁇ conversion of previously around 4-40 K / s is reduced to 0.05 K / s or less.
  • the specified parameters are particularly suitable for hot strip thicknesses of 2-3 mm and outlet roller table lengths between 100 and 150 m in order to ensure that the ⁇ / ⁇ conversion in the coiled coil is completed.
  • the method is applicable to steels made from Rest of iron and unavoidable impurities are produced.
  • the steel can be alloyed with Fe in addition to the remaining element
  • alloying elements serve to increase the hardenability (Cr, Ni, Mo, V, B) or the nitrogen setting (Ti, Zr) or to influence the sulfide form (Zr, Te).
  • Steels A, B, D, E, J, M, Q, R, X, Y fall under the invention.
  • Another important criterion of the method according to the invention is the lamella spacing of the pearlitic structure.
  • the steels produced by the process according to the invention have an average lamella spacing greater than 0.3 ⁇ m, while the steels with fine-lamellar pearlite have an average lamella spacing less than 0.2 ⁇ m.
  • the example of steels R and S makes it particularly clear that the complete ⁇ / ⁇ conversion in the wound coil is important.
  • the reel temperature of the steel S which does not fall under the invention, is 680 ° C higher than that of the steel R according to the invention at 665 ° C, the tensile strength of the steel S is significantly higher than that of the steel R.
  • the ⁇ / ⁇ conversion partially took place on the run-out roller table, the heat generated during the conversion leading to an increase in the reel temperature.
  • the ⁇ / ⁇ conversion took place completely in the coiled coil.
  • the increase in temperature during pearlite conversion led to an equalization of the temperature into the outer and inner turns of the coil and at the same time to a decrease in the cooling rate to 0.01 K / s, which led to a reduction in the strength of the strip.
  • the hot strips produced by the method according to the invention can be directly processed further at a lower cost by forming, such as bending, straightening, wrapping, etc., or rolled out to form cold strips.
  • the hot strips are characterized by uniformity of properties and structure over the length and width.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Claims (8)

1. Procédé de fabrication de feuillard laminé à chaud avec des valeurs de résistance à la traction de Rm = 500 à 780 N/mm², en acier non allié ou faiblement allié à 0,3 à 0,9% de C, dans lequel une brame d'acier est austénisée et est laminée à chaud sous forme de feuillard laminé à chaud qui, après le refroidissement du feuillard laminé à chaud, est enroulé sous forme de bobine, caractérisé en ce que le laminage à chaud et le refroidissement du feuillard laminé à chaud sont commandés sur le train de rouleaux de sortie de telle manière que la conversion τ/α dans le feuillard laminé à chaud ne commence que sur la bande enroulée et est terminée dans la bobine.
2. Procédé selon la revendication 1, caractérisé en ce que la température de laminage final lors du laminage à chaud se trouve à 860°C ou plus, une vitesse de laminage dans la dernière cage finisseuse est réglée à au moins 7 m/s, et que la température d'enroulage est maintenue à 640°C ou plus par un faible refroidissement à l'eau.
3. Procédé selon la revendication 1, caractérisé en ce que, pour une teneur en carbone du feuillard laminé à chaud dans la plage de 0,33 à 0,49%, pour régler une résistance à la traction d'au plus 650 N/mm², la température de laminage final lors du laminage est de 860°C ou plus, une vitesse de laminage dans la dernière cage finisseuse est réglée à au moins 8 m/s et la température d'enroulage est maintenue à 680°C ou plus.
4. Procédé selon la revendication 1, caractérisé en ce que, pour une teneur en carbone du feuillard laminé à chaud dans la plage de 0,50 à 0,65%, pour régler une résistance à la traction d'au plus 730 N/mm², la température de laminage final lors du laminage à chaud se trouve à 860°C ou plus, une vitesse de laminage dans la dernière cage finisseuse est réglée à au moins 7,5 m/s, et la température d'enroulage est maintenue à 660°C ou plus.
5. Procédé selon la revendication 1, caractérisé en ce que, pour une teneur en carbone du feuillard laminé à chaud dans la plage de 0,66 à 0,90%, pour régler une résistance à la traction d'au plus 780 N/mm², la température de laminage final se trouve à 860°C ou plus, une vitesse de laminage dans la dernière cage finisseuse est réglée à au moins 7 m/s, et la température d'enroulage est maintenue à 640°C ou plus.
6. Procédé selon la revendication 1, caractérisé en ce que la température de refroidissement dans la bobine est réglée à 0,05 K/s ou moins.
7. Procédé selon la revendication 1, caractérisé en ce que le feuillard laminé à chaud est fabriqué dans un acier constitué de
Figure imgb0010
le reste du fer et les impuretés inévitables.
8. Procédé selon la revendication 7, caractérisé en ce que l'acier est allié, pour charger l'élément résiduaire Fe, avec
Figure imgb0011
seuls ou à plusieurs.
EP88109771A 1987-07-01 1988-06-20 Procédé de fabrication de feuillard laminé à chaud Expired - Lifetime EP0301228B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88109771T ATE67792T1 (de) 1987-07-01 1988-06-20 Verfahren zur herstellung von warmband.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3721641 1987-07-01
DE3721641A DE3721641C1 (de) 1987-07-01 1987-07-01 Verfahren zur Herstellung von Warmband

Publications (2)

Publication Number Publication Date
EP0301228A1 EP0301228A1 (fr) 1989-02-01
EP0301228B1 true EP0301228B1 (fr) 1991-09-25

Family

ID=6330614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88109771A Expired - Lifetime EP0301228B1 (fr) 1987-07-01 1988-06-20 Procédé de fabrication de feuillard laminé à chaud

Country Status (6)

Country Link
US (1) US4898629A (fr)
EP (1) EP0301228B1 (fr)
AT (1) ATE67792T1 (fr)
CA (1) CA1305023C (fr)
DE (2) DE3721641C1 (fr)
ES (1) ES2025246B3 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3934037C1 (fr) * 1989-10-12 1991-02-14 Thyssen Stahl Ag, 4100 Duisburg, De
US5279688A (en) * 1989-12-06 1994-01-18 Daido Tokushuko Kabushiki Kaisha Steel shaft material which is capable of being directly cut and induction hardened and a method for manufacturing the same
EP0593000B1 (fr) * 1992-10-15 1998-03-25 NMH STAHLWERKE GmbH Acier pour rails
FR2704238B1 (fr) * 1993-04-19 1995-07-21 Lorraine Laminage Procede de fabrication sous forme de bobines d'une bande d'acier laminee a chaud.
US5527401A (en) * 1993-06-30 1996-06-18 Samsung Heavy Industry Co., Ltd. High toughness and high strength untempered steel and processing method thereof
JP3422094B2 (ja) * 1994-10-14 2003-06-30 日本精工株式会社 転がり軸受
JP3565960B2 (ja) * 1995-11-01 2004-09-15 山陽特殊製鋼株式会社 軸受用鋼、軸受および転がり軸受
US5863361A (en) * 1997-05-01 1999-01-26 Pennock Corporation Method for steckel mill operation
US5899914A (en) * 1997-06-11 1999-05-04 Endius Incorporated Surgical instrument
JP4119516B2 (ja) * 1998-03-04 2008-07-16 新日本製鐵株式会社 冷間鍛造用鋼
DE19821299A1 (de) * 1998-05-13 1999-11-18 Abb Patent Gmbh Anordnung und Verfahren zum Erzeugen von Warmband
FR2841370B1 (fr) * 2002-06-19 2004-08-06 Technip France Procede d'immobilisation de sodium metallique sous forme de verre
RU2292404C1 (ru) * 2005-07-15 2007-01-27 Открытое акционерное общество "Северсталь" Способ производства полос для изготовления труб
WO2007064172A1 (fr) * 2005-12-01 2007-06-07 Posco Tole d'acier pour formage a la presse a chaud qui presente d'excellentes proprietes de traitement a chaud et de resilience, elements presses a chaud faits de cette tole et procede de fabrication de ceux-ci
JP4609585B2 (ja) * 2008-06-06 2011-01-12 住友金属工業株式会社 軟窒化用鋼、軟窒化用鋼材およびクランクシャフト

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5828329B2 (ja) * 1977-04-18 1983-06-15 日本鋼管株式会社 厚肉高靭性鋼板の製造方法
DE3070180D1 (en) * 1979-12-06 1985-03-28 Salzgitter Peine Stahlwerke Hot rolled strip or plate of denitrided steel and process for its production
US4505141A (en) * 1982-07-13 1985-03-19 Tippins Machinery Company, Inc. Apparatus for thermomechanically rolling hot strip product to a controlled microstructure
JPS59173240A (ja) * 1983-03-22 1984-10-01 Nippon Steel Corp 開缶性の優れた高強度イ−ジ−オ−プン缶蓋用鋼板
JPS6077921A (ja) * 1983-10-05 1985-05-02 Nippon Steel Corp スケ−ル密着性の優れた熱延鋼板の製造方法
JPS6152317A (ja) * 1984-08-20 1986-03-15 Kobe Steel Ltd 低温靭性にすぐれた熱延鋼板の製造方法
JPS61174322A (ja) * 1985-01-28 1986-08-06 Nippon Steel Corp 機械構造用鋼の圧延材軟質化法

Also Published As

Publication number Publication date
DE3721641C1 (de) 1989-01-12
US4898629A (en) 1990-02-06
CA1305023C (fr) 1992-07-14
DE3865139D1 (de) 1991-10-31
EP0301228A1 (fr) 1989-02-01
ES2025246B3 (es) 1992-03-16
ATE67792T1 (de) 1991-10-15

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