EP4433617A1 - Verfahren zum herstellen eines warmbandes aus einem feinkornstahlwerkstoff - Google Patents
Verfahren zum herstellen eines warmbandes aus einem feinkornstahlwerkstoffInfo
- Publication number
- EP4433617A1 EP4433617A1 EP22818653.2A EP22818653A EP4433617A1 EP 4433617 A1 EP4433617 A1 EP 4433617A1 EP 22818653 A EP22818653 A EP 22818653A EP 4433617 A1 EP4433617 A1 EP 4433617A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hot strip
- hot
- temperature
- mpa
- cooling
- 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.)
- Pending
Links
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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
Definitions
- the invention relates to a method for producing a hot strip from a fine-grain steel material with a thickness dwB 1.75 mm and an average ferrite grain size of g s ⁇ 5 pm.
- Steel strips and fine-grain steel materials are usually manufactured in a multi-step process.
- a hot strip is first produced from a slab by means of several hot forming operations and then wound up into a coil.
- the hot strip produced in this way is then heat-treated and/or cold-rolled, thereby adjusting the thickness, the structure and the desired mechanical properties of the steel strip.
- known multi-step methods be designed more cost-effectively and simply.
- One possibility is to adjust the thickness of the steel strip as well as the structure after hot rolling for the possible end use.
- the rolling of a slab, in particular a thin slab, into a hot strip with a thickness dwB ⁇ 1.5 mm is known from the prior art.
- the slab or thin slab is heated to a material-specific forming temperature and rolled into a steel strip in a hot strip mill with a series of acceptance passes.
- the hot strip is then wound into a coil.
- the microstructure of the hot strip and the associated mechanical properties are set by the cooling conditions after hot forming and the cooling of the hot strip in the coil.
- the disadvantage of this known method is that the cooling in the coil is so slow due to the narrow windings of the strip that the usable microstructure is not reached immediately and must first be produced or set by an additional subsequent annealing treatment.
- the object of the invention is therefore the known method for producing a fine-grain steel material to be further developed in such a way that a hot-rolled steel sheet can be used immediately, both in terms of its thickness and its structure.
- the object of the invention is achieved by a method with the features of claim 1 and a hot strip with the features of claim 10 or claim 11.
- a hot strip made of a fine-grain steel material is obtained at least through the work steps:
- the hot strip is wound into a coil.
- the hot strip is cooled from the hot rolling temperature Tw to a temperature TH below the transformation temperature of the steel material using rapid cooling, in particular compact cooling.
- the transformation temperature TH is the temperature at which austenite decomposition begins.
- An approximate transition temperature TH can be read from the mean chemical analysis and an associated ZTU or ZTA diagram. Alternatively, equilibrium models can also be used to simulate the transition temperature TH.
- the transformation temperature TH determined in this way may have to be adjusted, since the segregation of the chemical elements during solidification can cause local deviations in the chemical analysis. This then shifts the local decomposition temperature and can thus shift it to higher or lower local transformation temperatures.
- the transformation temperature TH is to be adjusted in such a way that the core and transition area of the slab are preferably taken into account in the transformation temperature TH.
- the cooling of the hot strip by rapid cooling takes place at a relative cooling rate 3R of 3R>600 K/(s-mm), more preferably 3R>800 K/(s-mm).
- the cooling of the hot strip by rapid cooling begins within a period of t ⁇ 0.2 s, more preferably t ⁇ 0.1 s, after the last acceptance pass.
- the inventive combination of the features cooling rate, thickness of the hot strip and cooling to a temperature TH below the transformation temperature of pearlite, bainite and / or martensite produces a hot strip with the described yield strength of 300 MPa to 400 MPa at a thickness dwB ⁇ 1.5 mm and 400 MPa to 500 MPa with a thickness dwB of 1.5 mm and ⁇ 1.75 mm.
- the hot strip is preferably cooled from the hot rolling temperature Tw to a temperature below the transformation temperature TH within a distance of ⁇ 6 m, preferably ⁇ 4 m, after the last acceptance pass.
- the cooling to a temperature below the transformation temperature TH takes place using water as the coolant.
- Water is a standardized coolant here, easy to transport and to provide in terms of process technology.
- the cooling water used can also contain additives that modify the cooling properties of the water. Gases, in particular air, are also understood as additives to the cooling water in the sense of the invention. It is irrelevant whether the gases are used to transport the cooling water or to atomize the cooling water after or by means of a spray nozzle, for example.
- Additives in the sense of the invention can also be chemical substances that are suitable for modifying the boiling point or other physical or chemical properties of the cooling water.
- a relative water volume flow of V>0.002 m 3 /kg, preferably V>0.004 m 3 /kg, based on the mass flow of the hot strip, is preferably set during the cooling. In this area there is enough water for the desired cooling effect provided without unduly burdening the water management of a hot strip mill.
- a controller or regulator having at least one process model specifies a target value for the cooling rate before the last acceptance pass and/or adjusts it during the hot forming of the hot strip.
- the process model simulates, preferably online, the microstructure development during the hot rolling process on the basis of the chemical analysis of the hot strip to be rolled and other process parameters.
- process parameters are understood to mean all process parameters that are directly or indirectly connected to the production of a hot strip in a hot strip mill.
- Direct process parameters are, for example, the rolling speed, slab temperature, brazing.
- Analysis or sample acceptance, indirect process parameters are, for example, roll age, cooling water composition or plant conditions. Simulation models that simulate a structure based on chemical analyzes and known temperature profiles are known from the prior art.
- the control and regulation of the rolling train determines possible temperature profiles of the hot strip on the basis of existing target specifications or actual values using known temperature models. This preferably takes place cyclically during the ongoing process.
- the actual structure of the hot strip is also cyclically simulated from these temperature profiles by the structure model. If the actual microstructure deviates from the target microstructure, the target specifications, for example the intensity of the cooling at different points in the rolling train or the pass reduction, are adjusted by the control or regulation.
- the process model uses an optimization algorithm to determine the target value for the cooling rate to be set, with which the target structure, in particular the ferrite grain size, is reached.
- Such a control or regulation improves the setting of the mechanical properties of the finished hot strip by the targeted setting of the structure development in the course of the hot rolling process.
- the controller can better compensate and optimize possible fluctuations with the help of the process model.
- a microstructure sensor determines the microstructure of the hot strip and the process model the measured actual microstructure at the Target value determination of the cooling rate taken into account.
- the use of a microstructure sensor at one point within the hot strip mill makes it possible not only to determine possible microstructure developments on the basis of a chemical analysis, but also to take into account an actual state of the microstructure when predicting the microstructure development. This makes the target value determination for the cooling rate more accurate and the deviation smaller.
- the hot strip consists preferably of a steel material with the analysis
- N 0.000% to 0.050%, preferably 0.001% to 0.025%
- Nb 0.00% to 0.10%, preferably 0.01% to 0.06%
- V 0.00% to 0.10%, preferably 0.01% to 0.06%
- the hot strip temperature of the hot strip is preferably at least 50° C., more preferably at least 30° C. and at most 100° C., above the Ae3 temperature of the alloy of the hot strip before the last acceptance pass before rapid cooling. This ensures that the formation of ferrite in the hot strip does not take place until rapid cooling begins and that the more easily deformable austenite is present during the forming of the hot strip in the roll stands. Furthermore, the object of the invention is achieved by a hot strip that is produced by a method according to one of claims 1 to 9.
- FIG. 1 example of a casting-rolling plant
- FIG. 4 a) conventional structure of a fine-grain steel; b) Microstructure using the method according to the invention.
- FIG. 1 shows the schematic structure of a casting and rolling plant for the production of a hot strip.
- the continuous casting plant 1 produces a slab or thin slab from a liquid melt.
- the slab is heated to the temperature before the first tapping in the roughing train 3.
- FIG. 2 shows a diagram with the temperature curve a of a hot strip from the first tapping in the roughing stand to winding into a coil in the coiler.
- the hot strip is rolled in several steps to a thickness of ⁇ 1.6 mm. Without further influences, this occurs Temperature curve, for example, according to curve a.
- the furnace between the roughing stands and the first pass in the finishing stand is not used to heat up the pre-strip, but to homogenize the temperature between the core and the outer layer of the pre-strip.
- the finished hot strip is cooled to a temperature of ⁇ 520°C by a compact cooling system. This is followed by cooling to an exemplary coiling temperature of 150° C. by laminar cooling.
- Table 1 shows an example of an analysis of a fine-grain material.
- the degrees of deformation that are technically possible in this analysis in the individual acceptance passes and an example of the actual degree of deformation are shown in the diagram in FIG. It can be seen here that the forming work can essentially take place in the first four stands. The possible degrees of deformation then decrease, with this having a positive effect on the tolerances of the finished hot strip. Thereby, this method can adjust and maintain a fine grain from the beginning of the working.
- FIG. 4 a) and b) each show microsections of a rolled hot strip. Both hot strips consist of the same alloy, ie they are rolled from slabs from a single batch.
- Figure a) shows the cut of a conventionally produced hot strip.
- FIG. b) shows the cut of a hot strip produced according to the invention. Both hot strips were each wound into a coil after the hot rolling.
- a comparison of the microstructures shows that the method according to the invention produces a significantly finer grain directly after the hot rolling.
- the mean grain boundary is 5.5 ⁇ m in Figure a) and 4.4 ⁇ m in Figure b).
- the microstructure set in FIG. b) allows the hot strip to be used directly without further subsequent heat treatment.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021212902.1A DE102021212902A1 (de) | 2021-11-17 | 2021-11-17 | Verfahren zum Herstellen eines Warmbandes aus einem Feinkornstahlwerkstoff |
| PCT/EP2022/082238 WO2023089012A1 (de) | 2021-11-17 | 2022-11-17 | Verfahren zum herstellen eines warmbandes aus einem feinkornstahlwerkstoff |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4433617A1 true EP4433617A1 (de) | 2024-09-25 |
Family
ID=84440033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22818653.2A Pending EP4433617A1 (de) | 2021-11-17 | 2022-11-17 | Verfahren zum herstellen eines warmbandes aus einem feinkornstahlwerkstoff |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4433617A1 (de) |
| JP (1) | JP2024543075A (de) |
| CN (1) | CN118176310A (de) |
| DE (1) | DE102021212902A1 (de) |
| WO (1) | WO2023089012A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102023210877A1 (de) * | 2023-11-02 | 2025-05-08 | Sms Group Gmbh | Vorrichtung und Verfahren zur Herstellung eines warmgewalzten Metallbands |
| DE102023135965A1 (de) * | 2023-12-20 | 2025-06-26 | Sms Group Gmbh | Verfahren zum Betrieb einer Warmbandproduktionsanlage und Warmbandproduktionsanlage zur Herstellung eines Warmbandes |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2166121A1 (de) * | 1999-09-16 | 2010-03-24 | JFE Steel Corporation | Dünne Stahlplatte mit höher Festigkeit und Verfahren zu deren Herstellung |
| JP4062118B2 (ja) * | 2002-03-22 | 2008-03-19 | Jfeスチール株式会社 | 伸び特性および伸びフランジ特性に優れた高張力熱延鋼板とその製造方法 |
| JP3900061B2 (ja) * | 2002-10-23 | 2007-04-04 | 住友金属工業株式会社 | 熱延鋼板の製造方法 |
| CN102242308B (zh) * | 2005-08-03 | 2013-03-27 | 住友金属工业株式会社 | 热轧钢板及冷轧钢板及它们的制造方法 |
| WO2008096394A1 (ja) * | 2007-02-02 | 2008-08-14 | Sumitomo Metal Industries, Ltd. | 微細フェライト組織を有する熱延鋼板の製造方法、及び熱延鋼板 |
| JP5092433B2 (ja) * | 2007-02-02 | 2012-12-05 | 住友金属工業株式会社 | 熱延鋼板及びその製造方法 |
| JP6519011B2 (ja) * | 2015-05-11 | 2019-05-29 | 日本製鉄株式会社 | 熱延鋼板およびその製造方法 |
-
2021
- 2021-11-17 DE DE102021212902.1A patent/DE102021212902A1/de active Pending
-
2022
- 2022-11-17 CN CN202280073259.1A patent/CN118176310A/zh active Pending
- 2022-11-17 WO PCT/EP2022/082238 patent/WO2023089012A1/de not_active Ceased
- 2022-11-17 JP JP2024527813A patent/JP2024543075A/ja active Pending
- 2022-11-17 EP EP22818653.2A patent/EP4433617A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN118176310A (zh) | 2024-06-11 |
| JP2024543075A (ja) | 2024-11-19 |
| DE102021212902A1 (de) | 2023-05-17 |
| WO2023089012A1 (de) | 2023-05-25 |
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