WO2016059183A1 - Installation and method for producing heavy plate - Google Patents
Installation and method for producing heavy plate Download PDFInfo
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- WO2016059183A1 WO2016059183A1 PCT/EP2015/073943 EP2015073943W WO2016059183A1 WO 2016059183 A1 WO2016059183 A1 WO 2016059183A1 EP 2015073943 W EP2015073943 W EP 2015073943W WO 2016059183 A1 WO2016059183 A1 WO 2016059183A1
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- Prior art keywords
- temperature
- heavy plate
- heat treatment
- plate
- cooling
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Classifications
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- 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
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- 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
-
- 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
-
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/14—Plants for continuous casting
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/0263—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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
-
- 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
- B21B2001/225—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 by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Definitions
- the invention is directed to a method for producing heavy plates from a steel alloy, comprising continuously casting a molten steel and forming an existing casting into a slab with subsequent forming or hot rolling of the slab from the casting heat in several forming steps to a desired plate size and an immediately following , a targeted cooling of the resulting plate causing heat treatment of the plate, wherein the plate is cut in the direction of production before or after its heat treatment to a desired single sheet length.
- the invention is directed to an apparatus for carrying out such a method, which has a system which for immediate konsekutiven processing and / or processing a molten steel casting in which the molten steel is continuously pourable, a primary molding plant, in which a from the molten steel cast strand is moldable into a slab, a forming or rolling plant, in which the slab from the casting heat in several forming steps to a plate with a desired heavy plate dimension is rollable, and a heat treatment plant and arranged in the direction of production before or after the heat treatment plant heavy plate separation device comprises
- a system which for immediate konsekutiven processing and / or processing a molten steel casting in which the molten steel is continuously pourable
- a primary molding plant in which a from the molten steel cast strand is moldable into a slab
- a forming or rolling plant in which the slab from the casting heat in several forming steps to a plate with a desired heavy plate dimension is rollable
- the slab is rolled in several passes to the desired final thickness.
- a process for the production of steel sheet is known from EP 0 415 987 B1.
- a slab is produced by means of a continuous casting process, which is then heated after passing through a first forming step to reduce the slab thickness in an oven before entering a finishing mill in which the slab is rolled to steel or strip steel.
- the steel strip is subjected to a treatment consisting of a combination of targeted forming steps and targeted cooling and heating steps.
- the setting of the desired mechanical properties of the steel strip is effected by this combination of deformation at specifically set temperatures, the degree of deformation specifically carried out at a specific temperature and the deformation rates.
- the desired lengths of sheet are separated from the finish rolled steel sheet and stacked. After passing through the finishing train, no targeted heat treatment is carried out on the steel sheet produced.
- WO 2006/106376 A1 a method for the production of sheets having a thickness of 10-100 mm is known, which are produced from a continuously cast casting strand with a subsequent hot rolling.
- the hot rolling can be combined with cooling devices arranged between the individual rolling stands and a cooling of the rolled steel sheet effected thereby.
- the steel sheet After passing through the rolling mill, the steel sheet is passed through a heat treatment plant in the form of a cooling system and then steel plates are separated in the particular desired length.
- the invention has for its object to provide a solution for the production of plate, which does not bring the aforementioned disadvantages with it and allows the flexible production of different plate qualities.
- the object is achieved in that the heat treatment in the temperature range of 150 ° C - 1 .100 ° C as a combination of a targeted cooling of the obtained plate from the rolling heat to a desired first temperature with an immediately following targeted heating of the plate to a desired second temperature and an immediately subsequent cooling of the plate to a desired third temperature is performed.
- the object is achieved in that the heat treatment plant comprises at least one cooling device and at least one heater, which are designed such that a heat treatment of the heavy plate in the temperature range of 150 ° C - 1 .100 ° C in Form of a combination of a targeted cooling of the resulting plate from the rolling heat to a desired first temperature with an immediately following targeted heating of the heavy plate to a desired second temperature and an immediately subsequent cooling of the plate to a desired third temperature is feasible.
- a heat treatment is carried out which comprises a controlled cooling, a targeted reheating and in turn a targeted cooling of the heavy plate in several steps finished plate also formed over the width uniform temperature field with a resulting uniform structure in the finished plate, so that the plate a homogeneous mechanical property, d. H. has a homogeneous strength and / or toughness distribution.
- both plates in the normalized state d. H. Steels with high toughness, as well as in the tempered state, d. H. Steels with high strength, as well as special steels in the tempered state, d. H. subjected to tempering steels to produce.
- heavy plate is understood to mean a flat product which is defined as heavy plate in accordance with standard EN 10029.
- the method can be used to produce a wide variety of grades, such as those denoted by the abbreviation EN 10025-2: 2004. It can be heavy plate "as rolled" (abbreviation + AR), but also a normalized Heavy plate (abbreviation + N) or a thermomechanically rolled heavy plate (abbreviation + M) and a quenched and tempered plate (abbreviation + QT) are produced. And all this with one and the same device or plant.
- An advantageous method for producing a normalized plate according to the invention may include the measure that the plate is cooled after the forming or hot rolling in the immediately following heat treatment from the rolling heat to the first desired temperature, which is below the complete transition temperature of ⁇ -iron ( ⁇ mixed crystal; austenite) in ⁇ -iron (a mixed crystal; ferrite), it is then heated to the desired second temperature, as Normalglühungstemperatur above the complete conversion temperature of ⁇ -iron in ⁇ -iron, the A C 3- Temperature, is in the range of homogeneous austenite, and finally cooled to ambient temperature than the desired third temperature.
- the first desired temperature which is below the complete transition temperature of ⁇ -iron ( ⁇ mixed crystal; austenite) in ⁇ -iron (a mixed crystal; ferrite)
- the desired second temperature as Normalglühungstemperatur above the complete conversion temperature of ⁇ -iron in ⁇ -iron, the A C 3- Temperature, is in the range of homogeneous austenite, and finally cooled to ambient temperature than the desired third temperature.
- the invention provides for the measures in a refinement that the plate after cooling or hot rolling in the immediately following heat treatment from the rolling heat to the first desired temperature is cooled, which is below the Bainit Strukturstemperatur, then by Heating is maintained at a temperature lying in the region of the bainite transformation as the desired second temperature and is finally cooled to ambient temperature as the desired third temperature.
- the invention is characterized in an embodiment by the measures that the plate is cooled after forming or hot rolling in the immediately following heat treatment from the rolling heat to the first desired temperature, which is below the martensite formation temperature, then by heating is heated to a below the transition temperature of ⁇ -iron in ⁇ -iron, the A c r temperature, tempering temperature than the desired second temperature and is finally cooled to ambient temperature than the desired third temperature.
- the intended heat treatment comprises a cooling to room temperature.
- the invention therefore also provides that the final cooling to ambient temperature is carried out as the desired third temperature as air cooling.
- the invention therefore further provides in an embodiment that the cooling of the heavy plate from the rolling heat in the heat treatment immediately following the forming or hot rolling of the heavy plate is carried out to the first desired temperature by means of a strong water or air cooling.
- the invention also provides in a development that a part of, in particular further cooling and / or heating steps comprehensive, heat treatment is carried out after the plate has undergone a straightening and before it is stacked.
- the plate after its heating is directed to the desired second temperature and subsequently stacked, which the invention also provides.
- the method can be carried out particularly expediently with a heavy plate, so that the invention is further distinguished by the fact that in the several forming steps a plate with a thickness of more than 8 mm, in particular a thickness of 40 mm - 400 mm, and a width of more than 1 .200 mm is generated.
- the device according to the invention in an expedient and advantageous embodiment is characterized in that the cooling of the heavy plate to the desired third temperature is at least partially outside the heat treatment plant.
- the device is characterized in that the heat treatment plant is designed such that the heavy plate after forming or hot rolling in an immediately subsequent heat treatment by means of the cooling device from the rolling heat the first desired temperature, which is below the complete transformation temperature of ⁇ -iron ( ⁇ -mixed crystal; austenite) in ⁇ -iron (a-mixed crystal; ferrite), can be cooled, that the heavy plate is subsequently heated to the desired second temperature by means of the heating device; which can be heated as normalizing temperature above the complete transformation temperature of ⁇ -iron in ⁇ -iron, the A C 3 temperature, in the region of the homogeneous austenite, and that the heavy plate is finally cooled to ambient temperature than the desired third temperature.
- the heat treatment plant is designed such that the heavy plate after forming or hot rolling in an immediately subsequent heat treatment by means of the cooling device from the rolling heat the first desired temperature, which is below the complete transformation temperature of ⁇ -iron ( ⁇ -mixed crystal; austenite) in ⁇ -iron (a-mixed crystal; ferrite), can
- the device according to the invention is further characterized in that the heat treatment plant is designed such that the heavy plate after forming or hot rolling in a immediately following heat treatment by means of the cooling device from the rolling heat can be cooled to the first desired temperature, which is below the Bainit Strukturstemperatur, that the heavy plate is then by means of the heater by heating to a temperature lying in the bainite transformation temperature as the desired second temperature and that the heavy plate is finally at ambient temperature than the desired third temperature is cooled.
- a particularly advantageous embodiment of the apparatus for carrying out the method according to the invention for the production of sheets with the highest strength is characterized in that the heavy plate after forming or hot rolling in an immediately subsequent heat treatment by means of the cooling device from the rolling heat to the first desired temperature below can be cooled, that the heavy plate is then heated by means of the heater by heating to below the transition temperature of ⁇ -iron in ⁇ -iron, the A c r temperature, tempering temperature than the desired second temperature and that the plate finally to ambient temperature than the desired third temperature can be cooled.
- the device is designed to be used to produce a heavy plate having a thickness of more than 8 mm, in particular a thickness of 40 mm - 400 mm, and a width of more than 1 .200 mm in the several forming steps of the rolling mill is designed and trained, which the invention also provides.
- the device according to the invention in the production direction of the plate has a heating device downstream straightening system, which the invention also provides in development.
- the invention is also characterized by the fact that they one or more of the straightening machine in the production direction of the heavy plate downstream further heat treatment plant (s), which preferably each comprise at least one further cooling device and at least one further heating device / include.
- This embodiment of the invention makes it possible to carry out heat treatment processes or heat treatment measures on the rolled heavy plate even after straightening the produced heavy plate.
- Figure 1 is a schematic representation in the upper part of a device according to the invention for the production of continuous heavy plate and in the lower part of a schematic diagram of the temperature profile in each produced flat product over the length of the device and the individual parts of the device and device
- Figure 2 shows a schematic representation in the upper part of a device according to the invention for the production of single heavy plate and in the lower part of a diagram in a schematic representation of the
- an endless flat material thus passes through the individual plant parts or plant devices of the device 1 formed in the form of a production plant behind the heat treatment plant 5. Thereafter, the heavy plates 4 cut to individual plate lengths pass through a straightening system 6 and are then stacked by means of a discharge unit 7 in the usual way.
- the endless sheet material produced is already separated into individual sheet lengths prior to entry into the heat treatment unit 5, so that heavy plates 4 already divided into individual sheet lengths pass through the heat treatment unit 5 and then subsequently the straightening unit 6 and the discharge unit 7.
- the production of heavy plate in single sheet operation in the device 1 'according to the figure 2 is particularly for the production and processing of quenched sheets with very high shear strengths of advantage. Heavy plates with lower strengths, which on the other hand have lower strength values after passing through the heat treatment plant 5, can be produced both with the plant according to FIG. 2 in single sheet operation and with the plant according to FIG. 1 in continuous sheet operation.
- a molten steel is cast continuously in a casting plant 8 designed as a continuous casting plant in direct consecutive processing and / or processing.
- the cast strand forming thereby is formed in the usual way in a casting plant 8 associated with the original 9 to a slab, which then after passing through a descaling device 10 in a forming a forming system rolling mill 1 1 from the casting heat in several forming steps to a heavy plate 4 with each rolled rolled sheet.
- the ur- and formed heavy plate 4 then passes through the plant after the 1, the heat treatment plant 5 and is then separated by means of the separator 2, which is a cross-cutting device, to single length.
- the separator 2 which is a cross-cutting device
- the primary and shaped product heavy plate 4 is divided into individual sheet lengths prior to entry into the heat treatment plant 5 by means of the separating device 2, which is likewise designed as a cross-separating device, and driven through the heat treatment plant 5 as a single sheet.
- the heat treatment system 5 comprises a cooling device 12 and a heating device 13. Thereafter, the heavy plates 4 pass through the leveling device 6 and are stacked in the discharge unit 7. In a manner not shown can also be arranged between the straightener 6 and the discharge unit 7 more heat treatment equipment 5, if this should be necessary for qualities that must be subjected to a special heat treatment.
- These systems can also each comprise a cooling device and a heating device, so that a combination of increased air cooling or water cooling with a subsequent heating to a tempering temperature can also be carried out with these heat treatment plants.
- the forming or rolling plant 1 1 is equipped in a conventional manner with means for profile and flatness adjustment and means for controlling the surface temperature of the rolling stock.
- the embodiment of the device 1 according to FIG. 1 is suitable for heavy plates with small thicknesses and low shear strengths, in which high shear rates can be achieved.
- the embodiment of the device V according to FIG. 2 it is also possible to produce heavy plates having the highest strength values, since the separation in the separating device 2 in the production direction 3 takes place immediately after leaving the rolling plant 11 from the rolling heat and thus in a high temperature range. In these Temperatures have the usual heavy plate processed materials still low shear strengths.
- heavy plates can be produced directly from the casting heat of a continuous casting plant. A cooling to room temperature of more than five minutes does not take place.
- the cast slabs have a thickness of at least 40 mm, wherein the maximum possible slab thickness is limited by the design and technical characteristics of the subsequent forming and rolling mill 1 1 and the required or desired at the outlet or thickness of the heavy plate 4.
- the width of the slab is not particularly limited but corresponds to the slab widths which can usually be achieved with such systems according to the state of the art.
- the continuous caster may be a sheetfed, a vertical turn, a vertical or a horizontal caster.
- a reduction in the thickness of the cast strand by deformation with liquid core (liquid core reduction) or a slight deformation in the area of the final solidification of the cast strand (dynamic soft reduction) is not necessary for carrying out the method according to the invention, but can be carried out if desired.
- the endlessly cast casting strand leaves the exit region of the primary molding installation 9 with an average temperature of from 1..150 ° C. to 1 .300 ° C. and solidified core.
- Steel grades or materials which are prone to scale formation are then descaled in the descaling device 10. In the case of high-alloyed materials, this process step may be omitted, although in these materials cleaning of the surface after a first forming step in the subsequent forming plant or rolling plant 11 is recommended.
- materials or steel grades are cleaned with a higher tendency to scale formation in the usual way before the first forming step in the forming or rolling mill 1 1, which is usually done with pressurized water or steam, but using alternative methods such as Cleaning with dry ice or water to which abrasive ingredients are added is also possible.
- the forming process carried out in the casting installation 8 and the primary molding installation 9 is then followed in the forming installation or rolling plant 11 by a forming or forming process comprising at least two forming steps with an accumulated logarithmic deformation degree of more than 0.7.
- a forming or forming process comprising at least two forming steps with an accumulated logarithmic deformation degree of more than 0.7.
- more than two scaffolds that perform at least two forming steps be part of the rolling mill 1 1, so that depending on the required final thickness of the plate further forming steps can follow.
- the heavy plate 4 which has been shaped and rolled to the desired plate size after passing through the rolling mill 1 1, leaves the rolling mill 1 1 at a temperature in the range from 950 ° C. to 1 .100 ° C.
- the heavy plate 4 at this point has a temperature which is above an optimum temperature for normalizing rolling.
- a heat treatment by means of the heat treatment system 5 follows directly from the rolling heat, to which the heavy plate 4 is fed directly after the deformation and rolling.
- the rolling stock, ie the heavy plate 4 remains for this purpose in the production plant or the device 1 or 1 '.
- a normalized plate 4 is produced.
- the rolled plate 4 is supplied in the heat treatment plant 5 of the cooling device 12 and cooled here to a temperature (T), in which the conversion of ⁇ -iron, ie the forming ⁇ -mixed crystal or austenite, in ⁇ -iron, ie the Forming a-solid solution or ferrite, has completely expired.
- T temperature
- the plate 4 is thus cooled to a temperature which is below the temperature line 15, which represents the lower end temperature of the conversion range of ⁇ -iron in ⁇ -iron.
- the cooling rates are in this case such that no fractions of hard microstructures such as martensite or bainite arise.
- the thus cooled heavy plate 4 is subjected to a Normalglühung, including the temperature of the plate 4 is increased over the A C 3 temperature of the respective material and is held there for a short time.
- This is done by means of the heating device 13, which passes through the heavy plate 4 after passing through the cooling device 12 in the production direction 3.
- the desired heating of the heavy plate 4 to a temperature above the A C 3 temperature by means of a conventional roller hearth furnace with open gas firing or radiant tube heating, by means of induction heating or by using the so-called "direct flame inpingement" or a combination of all
- the heating device 13 is designed such that it can be operated in a temperature range of 150 ° C. to 1 .100 ° C.
- the manufactured heavy plate 4 is cooled in air to ambient temperature, which is usually carried out. after the heavy plate 4 has left the heat treatment plant 5.
- the course of the dotted cooling curve and heat treatment line 16 shows the temperature profile in the production of high-strength sheets, which have useful properties that are characterized by a bainitic microstructure state.
- the rolled plate 4 is cooled in the heat treatment plant 5 by means of the cooling device 12 to temperatures between the beginning of the bainite transformation characterizing temperature line 17 and the beginning of the transformation of the microstructure in a martensite microstructure characterizing temperature line 18.
- the plate 4 is then held within the heat treatment plant 5 in this, lying between the temperature lines 17 and 18 area, so that the conversion of the structure in a bainite structure continues to run.
- the rolled plate 4 in the cooling device 12 of the heat treatment system 5 is relatively strongly cooled to temperatures below the temperature line 18 characterizing the beginning of the martensite transformation.
- the heavy plate 4 in the heater 13 to below the A i C -temperature of the respective material and thus below the temperature limiting the end of the conversion range of ⁇ -iron into ⁇ -iron.
- the heavy plate 4 is again cooled in air to ambient temperature after leaving the heat treatment plant 5.
- the method according to the invention as well as the device according to the invention make it possible to save energy in the production of heavy plates, which otherwise require a subsequent heat treatment integrated in the production process of a respective heavy plate in a single length in a production according to the methods known from the prior art.
- heavy plates 4 in the normalized state for example the quality S355J2 + N
- tempered plates for example the quality S355 + QT
- a steel grade or a steel quality can be produced in one casting sequence. Ie. It can be produced in the system in a casting sequence plates 4 steel melts whose chemical composition or basic composition is the same, but their heat treatment is different.
- the processes which can be carried out with the devices 1 and 1 'according to the invention do not apply compared to the prior art, the cooling of the slab produced to room temperature, their reheating before hot rolling and additionally the cooling and heating before a heat treatment.
- Another advantage of the devices 1 and 1 'according to the invention is that it is possible to produce with these plates 4 made of high-strength steels with a bainitic structure by annealing in the bainite stage.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15783979.6A EP3206808B1 (en) | 2014-10-16 | 2015-10-15 | Installation and method for producing heavy plate |
KR1020177010367A KR20170056668A (en) | 2014-10-16 | 2015-10-15 | Installation and method for producing heavy plate |
JP2017520350A JP2017538583A (en) | 2014-10-16 | 2015-10-15 | Apparatus and method for the production of rough plates |
CN201580056012.9A CN107075600A (en) | 2014-10-16 | 2015-10-15 | Apparatus and method for manufacturing heavy-gauge sheeting |
RU2017116602A RU2017116602A (en) | 2014-10-16 | 2015-10-15 | INSTALLATION AND METHOD FOR PRODUCING THICK SHEETS |
US15/518,604 US20170275729A1 (en) | 2014-10-16 | 2015-10-15 | Method of and for producing heavy plates |
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EP (1) | EP3206808B1 (en) |
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CN109491326A (en) * | 2017-09-12 | 2019-03-19 | 宝山钢铁股份有限公司 | A kind of slab edge optimization shearing property system |
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CN111889639B (en) * | 2020-08-04 | 2021-11-16 | 江苏华龙铸铁型材有限公司 | Production line for vertically and continuously casting ultra-long pipe and use method thereof |
EP4438746A1 (en) * | 2023-03-27 | 2024-10-02 | Primetals Technologies Austria GmbH | Method for directly producing a trip steel strip in a casting-rolling composite installation and a trip steel strip produced by the method |
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---|---|---|---|---|
CN109491326A (en) * | 2017-09-12 | 2019-03-19 | 宝山钢铁股份有限公司 | A kind of slab edge optimization shearing property system |
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EP3206808A1 (en) | 2017-08-23 |
CN107075600A (en) | 2017-08-18 |
KR20170056668A (en) | 2017-05-23 |
JP2017538583A (en) | 2017-12-28 |
US20170275729A1 (en) | 2017-09-28 |
DE102014221068A1 (en) | 2016-04-21 |
RU2017116602A3 (en) | 2018-11-19 |
EP3206808B1 (en) | 2021-02-17 |
RU2017116602A (en) | 2018-11-19 |
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