CA2686377A1 - Method for hot rolling and for heat treatment of a strip of steel - Google Patents

Method for hot rolling and for heat treatment of a strip of steel Download PDF

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Publication number
CA2686377A1
CA2686377A1 CA002686377A CA2686377A CA2686377A1 CA 2686377 A1 CA2686377 A1 CA 2686377A1 CA 002686377 A CA002686377 A CA 002686377A CA 2686377 A CA2686377 A CA 2686377A CA 2686377 A1 CA2686377 A1 CA 2686377A1
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CA
Canada
Prior art keywords
strip
cooling
heating
temperature
coiling
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
CA002686377A
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French (fr)
Other versions
CA2686377C (en
Inventor
Joachim Ohlert
Ingo Schuster
Peter Sudau
Juergen Seidel
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SMS Siemag AG
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Individual
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Filing date
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Publication of CA2686377A1 publication Critical patent/CA2686377A1/en
Application granted granted Critical
Publication of CA2686377C publication Critical patent/CA2686377C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0252—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with application of tension
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties 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 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0452—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment with application of tension
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0463—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill

Abstract

The invention relates to a process for hot rolling and for heat treatment of a strip (1) of steel. To make it possible to produce high-strength and very high-strength strips having satisfactory toughnesses more economically in a continuous production plant, the process provides the steps: a) heating of the slab to be rolled; b) rolling of the slab to the desired strip thickness; c) cooling of the strip (1), with the strip (1) having a temperature above ambient temperature (T0) after cooling; d) rolling up of the strip (1) to produce a coil (2); e) rolling off of the strip (1) from the coil (2); f) heating of the strip (1); g) cooling of the strip (1) and h) transport of the strip (1) to a further destination, with the strip (1) having a temperature above ambient temperature (T0) before heating as per step T).

Claims (38)

1. A method for hot rolling and for heat treatment of a strip (1) of steel, comprising the steps:

a) heating the slab to be rolled;

b) rolling the slab to the desired strip thickness;
c) cooling the strip (1), wherein after cooling the strip has a temperature above the ambient temperature (T0);

d) coiling the strip (1) into a coil (2);
e) uncoiling the strip from the coil (2);
f) heating the strip (1);

g) cooling the strip (1) and h) removing the strip (1), wherein before the heating according to step f), the strip (1) has a temperature above the ambient temperature (T0).
2. The method according to claim 1, characterised in that when carrying step d) of claim 1, the coil (2) is located at a coiling station (3) and that when carrying out step e) of claim 1, it is located at an uncoiling station (4) spatially remote from the coiling station (3), wherein the coil (2) is transported from the coiling station (3) to the uncoiling station (4) between steps d) and e) in a thermally insulated manner.
3. The method according to claim 1 or 2, characterised in that step e) of claim 1 directly follows step d) of claim 1.
4. The method according to one of claims 1 to 3, characterised in that during cooling or after cooling according to step c) and/or according to step g) of claim 1, the strip (1) is subjected to a straightening process.
5. The method according to one of claims 1 to 4, characterised in that between the uncoiling according to step e) of claim 1 and the heating according to step f) of claim 1, the strip (1) is subjected to a straightening process.
6. The method according to one of claims 1 to 5, characterised in that between the heating according to step f) of claim 1 and the removal according to step h) of claim 1, the strip (1) is subjected to a straightening process.
7. The method according to one of claims 4 to 6, characterised in that the straightening process is effected by deflecting the strip (1) around base, deflecting, driving or other rollers.
8. The method according to one of claims 5 to 7, characterised in that the straightening process is carried out by means of a skin-pass frame.
9. The method according to one of claims 1 to 8, characterised in that the strip (1) is subjected to a straightening process during the heating according to step f) of claim 1.
10. The method according to one of claims 1 to 9, characterised in that the cooling of the strip (1) according to step c) of claim 1 comprises a laminar cooling and intensive cooling.
11. The method according to one of claims 1 to 10, characterised in that the cooling of the strip (1) according to step g) of claim 1 comprises a laminar cooling.
12. The method according to one of claims 1 to 11, characterised in that the cooling of the strip (1) according to step c) and/or according to step g) of claim 1 takes place in zones over the width of the strip.
13. The method according to one of claims 1 to 10, characterised in that the cooling of the strip (1) according to step g) of claim 1 comprises air cooling.
14. The method according to one of claims 1 to 13, characterised in that the cooling of the strip (1) according to step g) of claim 1 is carried by means of a high-pressure bar so that cleaning and/or descaling of the strip takes place at the same time.
15. The method according to one of claims 1 to 14, characterised in that the heating of the strip (1) according to step f) of claim 1 comprises inductive heating.
16. The method according to claim 15, characterised in that the inductive heating of the strip (1) takes place in an inert gas atmosphere.
17. The method according to one of claims 1 to 14, characterised in that the heating of the strip (1) according to step f) of claim 1 is effected by direct flame impingement of the strip.
18. The method according to claim 17, characterised in that the direct flame impingement of the strip (1) is effected by a gas jet comprising at least 75% oxygen in which a gaseous or liquid fuel is mixed.
19. The method according to claim 18, characterised in that the direct flame impingement is effected by a gas jet comprising pure oxygen.
20. The method according to one of claims 1 to 19, characterised in that the removal of the strip (1) according to step h) of claim 1 comprises coiling the strip (1).
21. The method according to one of claims 1 to 19, characterised in that the removal of the strip (1) according to step h) of claim 1 comprises pushing off plate-like cut portions of the strip (1).
22. The method according to one of claims 1 to 21, characterised in that before the cooling according to step c) of claim 1 the strip (1) has a temperature of at least 750°C.
23. The method according to one of claims 1 to 22, characterised in that after the cooling according to step c) of claim 1 and before coiling according to step d) of claim 1, the strip (1) has a temperature of at least 25°C and at most 400°C, preferably between 100°C and 300°C.
24. The method according to one of claims 1 to 23, characterised in that after the heating according to step f) of claim 1, the strip (1) has a temperature of at least 400°C, preferably between 400°C and 700°C.
25. The method according to one of claims 1 to 24, characterised in that the heating of the strip (1) according to step f) of claim 1 is effected so that the strip has different temperatures over its width.
26. The method according to one of claims 1 to 25, characterised in that after the cooling according to step g) of claim 1 and before removal according to step h) of claim 1, the strip (1) has a temperature of at most 200°C, preferably between 25°C and 200°C.
27. The method according to one of claims 1 to 26, characterised in that the steps e) to g) of claim 1 are carried out in reversing mode for which a coiling station (5) located after the cooling according to step g) of claim 1 is used.
28. The method according to one of claims 1 to 27, characterised in that the flatness of the strip (1) and/or the temperature of the strip (1) is measured at least at two locations in the strip treatment installation for monitoring the quality of the strip (1).
29. The method according to one of claims 1 to 28, characterised in that the running speed of the strip through the strip treatment installation, the in particular zone-related strip heating, the adjustment of the straightening rolls and/or the in particular zone-related cooling are controlled or regulated by a process model.
30. The method according to one of claims 1 to 29, characterised in that during passage through the strip treatment installation, the strip (1) is held under a defined strip tension at least in sections by means of drivers.
31. A method for hot rolling and for heat treatment of a strip (1) of steel, comprising the steps:

a) heating the slab to be rolled;

b) rolling the slab to the desired strip thickness;
c) cooling the strip (1), wherein after cooling the strip (1) has a temperature above the ambient temperature (T0);

d) coiling the strip (1) on a first coiler (22);

e) reversing the strip (1) between the first coiler (22) and a second coiler (23) wherein the strip is subject to heating between the coilers (22, 23), wherein before the heating according to step e), the strip (1) has a temperature above the ambient temperature (T0).
32. The method according to one of claims 1 to 31, characterised in that a strip tension is built up by means of drivers (34, 35) before and after the cooling of the strip (1).
33. The method according to one of claims 1 to 32, characterised in that a strip (1) is guided transversely to its longitudinal axis by means of a lateral guidance (33.1, 33.2).
34. The method according to claim 33, characterised in that the lateral guidance (33.1, 33.2) takes place in the area of the cooling of the strip (1).
35. The method according to claim 34, characterised in that the lateral guidance (33.1, 33.2) takes place in the area of the laminar cooling of the strip (1).
36. The method according to claim 32 and one of claims 33 to 35, characterised in that the lateral guidance (33.1, 33.2) of the strip (1) takes place before the driver (34, 35) and opens after passing the strip head and closes at the strip end.
37. The method according to one of claims 1 to 36, characterised in that a measurement of the strip temperature is made by means of a low-temperature radiation pyrometer.
38. The method according to one of claims 1 to 37, characterised in that a measurement of the strip temperature is made before, inside and/or after the cooling and/or heating devices.
CA2686377A 2007-06-22 2008-06-04 Method for hot rolling and for heat treatment of a strip of steel Expired - Fee Related CA2686377C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE102007029280.7 2007-06-22
DE102007029280 2007-06-22
DE102008010062.5 2008-02-20
DE102008010062A DE102008010062A1 (en) 2007-06-22 2008-02-20 Process for hot rolling and heat treatment of a strip of steel
PCT/EP2008/004435 WO2009000387A1 (en) 2007-06-22 2008-06-04 Process for hot rolling and for heat treatment of a steel strip

Publications (2)

Publication Number Publication Date
CA2686377A1 true CA2686377A1 (en) 2008-12-31
CA2686377C CA2686377C (en) 2011-09-27

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Family Applications (1)

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CA2686377A Expired - Fee Related CA2686377C (en) 2007-06-22 2008-06-04 Method for hot rolling and for heat treatment of a strip of steel

Country Status (23)

Country Link
US (1) US20100175452A1 (en)
EP (1) EP2162557B1 (en)
JP (1) JP5485147B2 (en)
KR (1) KR101153732B1 (en)
CN (1) CN101755058B (en)
AR (1) AR067091A1 (en)
AT (1) ATE504665T1 (en)
AU (1) AU2008267505B2 (en)
BR (1) BRPI0812324A2 (en)
CA (1) CA2686377C (en)
DE (2) DE102008010062A1 (en)
DK (1) DK2162557T3 (en)
EG (1) EG25307A (en)
ES (1) ES2362052T3 (en)
MX (1) MX2009013530A (en)
MY (1) MY148425A (en)
PL (1) PL2162557T3 (en)
RU (1) RU2429922C1 (en)
SI (1) SI2162557T1 (en)
TW (1) TWI412410B (en)
UA (1) UA98653C2 (en)
WO (1) WO2009000387A1 (en)
ZA (1) ZA200907733B (en)

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