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    • 专利摘要:
    The present invention relates to a method for determining the ferritic phase fraction xα after heating or during cooling of a steel strip (2) in a metallurgical plant. Moreover, the invention relates to an apparatus for carrying out the method. The object of the invention is to provide a method by which the ferritic phase content in the steel strip (2) online, can be determined quickly and with as much as possible means. This object is achieved by a method which comprises the following method steps: measuring a width w1 and a temperature T1 of the steel strip (2), wherein the steel strip (2) has a ferritic phase fraction xα1 during the measurements; - Heating or cooling of the steel strip (2), wherein in the steel strip (2) during heating at least partially a phase transition α → y from the ferritic state α in the austenitic state y and at least partially cooling a phase transition from the austenitic state y to the ferritic state y α takes place; Measuring a width w and a temperature T of the at least partially converted steel strip (2); Determining the ferritic phase fraction xα by where T0 is a reference temperature, and αα and αy are the linear thermal expansion coefficients of ferrite and austenite
    公开号:AT514380A1
    申请号:T50620/2013
    申请日:2013-09-26
    公开日:2014-12-15
    发明作者:
    申请人:Siemens Vai Metals Tech Gmbh；
    IPC主号:
    专利说明:

    1 201301281
    description
    Determination of the ferritic phase content after heating or cooling of a steel strip
    Field of engineering
    The present invention relates to a method and a computer program product for determining the ferritic phase fraction xa after heating or cooling a steel strip in a metallurgical plant, such as a annealing or a cooling line. Moreover, the invention relates to an apparatus for carrying out the method.
    State of the art
    According to the prior art, it is known to determine the phase components in a steel strip via the so-called Barkhausen noise or the measurement of the magnetic hysteresis. In addition, it is known to determine the phase proportions in a steel strip by a so-called post-mortem analysis, comprising the steps of sampling, sample preparation and a metallurgical analysis of the prepared sample. By means of post-mortem analysis, indirect (that is, the structure) can be deduced from the process conditions present in a cooling or heating section.
    A disadvantage of the measurement of the Barkhausen noise or the measurement of the magnetic hysteresis is that the measuring head must be brought very close to the tape. In addition, additional measuring devices are necessary, which are often not available in a metallurgical plant. This results in a considerable additional equipment and personnel.
    A disadvantage of the post-mortem analysis is that only a long time after the production of the steel strip is completed, the achievement of the required properties of the formed structure can be deduced. Due to the long time delay in the post-mortem analysis, it can be used for the controlled compensation of transient conditions in the production of the steel strip - e.g. with a slowing of the casting speed due to a pan change, which is associated with a reduction in the throughput speed of the steel strip through a cooling line in a cast-rolling composite plant - not be used.
    Summary of the invention
    The object of the invention is to overcome the disadvantages of the prior art and to provide a method, a computer program product, and a device for determining the ferrite phase content after heating or cooling a steel strip with which the ferritic phase content - online, i. without interruption to ongoing operations, - rapidly, i. within a short time for the measurement and evaluation, with the simplest possible means, i. without elaborate measuring instruments, - without a complex evaluation, and - can be determined with sufficiently high accuracy.
    This object is achieved by a method for determining the ferritic phase fraction xa after heating or cooling a steel strip according to claim 1. Advantageous embodiments are the subject of the dependent claims.
    Specifically, the method comprises the following method steps: measuring a width wi and a temperature of steel strip 7, the steel strip having a ferritic phase angle during the measurements; Heating or cooling of the steel strip, wherein in the steel strip at least partially a phase transformation α-> γ from a ferritic state a to the austenitic state γ and upon cooling at least partially a phase
    Conversion of the austenitic state y takes place in a ferritic state a; Measuring a width w and a temperature T of the at least partially converted steel strip; Determining the Ferritic Phase Component xa by: -w-wxal aa (7i-7q) -w Ky (T1-r0) + wxalKy (T1-r0) + w1 + w1 κγ (Τ-Γ0) X "~~ Wl [- aa (r-r0) + ay (r-7o)] where T0 is a reference temperature, and aa and αγ are the linear thermal expansion coefficients of ferrite and austenite.
    In this case - typically either immediately after the austenitic finish rolling (the steel strip having a fully austenitic structure in the last pass) of the steel strip in a hot rolling mill, or immediately after cooling (the steel strip having a fully ferritic structure after cooling) of the steel strip in a cooling line - the width and the temperature T ± of the steel strip measured, the steel strip having a ferritic phase content xal. This ferritic phase fraction xal is either sufficiently well known from the process regime (e.g., after austenitic finish rolling with xal = 0) or is determined once by methods for determining the phase proportions of the prior art. The two measurements for determining the width w ± and the temperature T ± are advantageously carried out without contact, e.g. by an optical width measurement or a pyrometer. For the highest possible accuracy, it is advantageous if both measurements take place at the same time on the same section of the - typically uncut - band. Subsequently, the steel strip is heated (e.g., in a heating section) or cooled (e.g., in a cooling section).
    Upon cooling, the structure of the steel strip is at least partially converted from the austenitic state γ (i.e., austenite) to a ferritic state a (e.g., a ferrite, or a martensite ...). Upon heating, the structure of the 4/30 4 201301281
    Steel bands are at least partially converted from a ferritic state a to the austenitic state y.
    After heating or cooling of the steel strip, in turn, the width w and the temperature T of the at least partially converted steel strip are determined. Again, it is advantageous if both measurements are made at the same time on the same section of the tape.
    Finally, the ferritic phase component xa is replaced by the
    Formula xa = wxa 1 ctg (7i-7b) -w ayCTg-roHwxmayClä-ToHwa + W! κγ (Τ-Γ0) _ wi [-aa (r-r0) + ay (r-r0)] is true, except for the determination of the ferritic phase portion xa next to the widths wx and w, the temperatures 7 ^ and T, only some physical Parameters for the steel strip, such as the length expansion functions αγ for austenite and aa are used for a ferrite. These functions are typically assumed to be linear; their parameters-usually referred to in the literature as linear expansion coefficients-are known to the person skilled in the art, e.g. from http://www.memory-metal.de/html/03 knowhow / PDF / MM 04 properties d.pdf or http://www.attempo.com/Daten/Kernmaterialien.pdf. Finally, T0 is a reference temperature of typically 20 ° C.
    In an alternative embodiment of the invention, the so-called spatial coefficient of linear expansion is used instead of the linear coefficient of linear expansion. It is inferred about the change in length and width of the steel strip during cooling to the ferritic phase content.
    By the invention, the converted microbial content can be read online, i. during operation of the metallurgical plant, with a sufficiently high accuracy and essentially determined by equipment that is typically already present in metallurgical plants. In addition, the ferritic phase fraction increased or decreased during the considered process step can be easily and quickly determined by the above formula.
    A practical class of application areas is covered by the method of claim 2. Concretely, in the method of determining the ferritic phase fraction xa after heating a steel strip, the following process steps are performed: measuring the width w-l and the temperature of the steel strip, the steel strip being completely in a ferritic state with xal = 1 during the measurements; Heating of the steel strip, wherein in the steel strip at least partially a phase transformation a-> y takes place from the ferritic state a into the austenitic state γ; Measuring a width w and a temperature T of the at least partially converted steel strip; Determining the ferritic phase component xa by -w -waa (Tx-T0) + wx + wx αγ (Τ-T0)
    Wl [-aa (T-T0) + aY (T-T0)] '
    This procedure assumes that the steel strip is initially completely in a ferritic state; this is often the case when the steel strip is cooled before, preferably immediately before, measuring the width w ± and the temperature 7 'in a cooling line (e.g., a laminar cooling line).
    In the technically important case of heating the steel strip by annealing, the measurement of the width w and the temperature T of the at least partially converted steel strip takes place during and / or after the annealing.
    When annealing, it is particularly advantageous if the annealing time and / or annealing temperature during annealing is set as a function of the ferritic phase fraction xa, preferably regulated. 6/30 6 201301281
    The setting of the annealing time can be easily done via the passage speed of the strip through the annealer. It should be noted, however, that the speed of passage of the belt also changes the throughput through the annealer. In the case of directly coupled operation of a glow with a cooling zone (rapid cooling zone), the change in the throughput speed of the strip by the annealer also alters the speed during cooling (also quenching).
    The setting of the annealing temperature is usually carried out by burners.
    For example, in the case of an intercritical annealing in a continuous annealing line for smaller and quick corrections of the ferrite phase fraction xa, the throughput speed can be changed and the annealing temperature can be immediately followed, since the annealing temperature can of course be slower than the throughput speed. Subsequently, the passage speed of the belt is successively reduced back to the desired target, wherein the annealing temperature is adjusted in parallel, so that the actual phase component xa corresponds to the desired phase portion as closely as possible.
    In any case, by the controlled or regulated setting of the annealing time and / or the annealing temperature, the actual microstructure composition can be adjusted to a desired microstructural composition. The target microstructure is achieved particularly precisely when the annealing time and / or the annealing temperature is set in a regulated manner. In the controlled setting of the annealing time, a target-actual comparison between the target phase component and the actual phase component xa is made, the annealing is continued until the actual phase component xa corresponds to the desired phase portion as closely as possible. In the controlled setting of the annealing temperature, the annealing temperature is adjusted as long as the actual phase component xa matches the desired phase component, depending on the target / actual comparison between the desired phase component and the actual phase component xa equivalent.
    Another technically important special case of the method according to the invention for determining the ferritic phase content after cooling of a steel strip is covered by claim 7. Specifically, the following process steps are carried out: measuring the width w and the temperature Tt of the steel strip, during which the steel strip is completely in the austenitic state with xal = 0; Cooling the steel strip, at least in part taking place in the steel strip a phase transformation from the austenitic state y to a ferritic state a; Measuring a width w and a temperature T of the at least partially converted steel strip; Determination of the Ferritic Phase Component xa by _ -w -w αγ (T1-T0) + w1 + w1 αγ (Τ-T0) X "_ Wl [-aa (T-T0) + aY (T-T0)] '
    This special case occurs in particular when the steel strip is in the "austenitic state". finish rolling, i. the steel strip leaves the last rolling stand of the finishing train in the austenitic state and is then cooled.
    It is particularly advantageous if the steel strip is hot-rolled before, preferably immediately before, measuring the width wi and the temperature Ti. In the preferred embodiment, a partial phase transition from the austenitic state between hot rolling and the measurements of and is prevented.
    Typically, the steel strip is cooled after measuring the width w ± and the temperature in a cooling section.
    When hot rolling, it may be expedient if the measurement of the width w and the temperature T of the steel strip, which is at least partially transposed, takes place immediately before being wound up. However, these measurements could also be made before, e.g. during or after cooling in a cooling section, take place.
    The phase transformation can be set particularly accurately if the cooling is set during cooling in the cooling section as a function of the ferrite phase fraction xa determined in this way.
    In the simplest case, the cooling section is controlled. A particularly accurate adjustment of the phase transformation is regulated, i. by a target-actual comparison, wherein the deviation between the desired and the actual value of the ferritic phase component is used for the adjustment of the cooling section. As a result, the degree of conversion in the cooling section can be specified precisely even under transient operating conditions.
    The cooling can be controlled, for example, over the cooling time and / or the cooling intensity or preferably regulated, be set in dependence of the ferritic phase components xa.
    A computer program product for carrying out the method according to the invention, to which values for the width wx and the temperature T ± before the at least partial phase transformation, the width w and the temperature of the steel strip after the at least partial phase transformation, and physical parameters of the steel strip can be fed, has a calculation module for calculating the ferritic phase fraction xa _ -w-wxal aa (71-7¾) -w gy ^ -roj + wXgaayCTx-roj + Wa + W! αγ (Τ-Γ0)
    Xa "[-αα (τ-τ0) + αγ (τ-τ0)]. Thus, the computer program product can be loaded into a computer which executes the method according to the invention, for example in a metallurgical plant.
    A device for determining the ferritic phase fraction xa after heating or cooling a steel strip in a cooling section, in particular for carrying out the method according to the invention, comprises a first temperature measuring device for measuring Tx and a first width measuring device for measuring w1; a second temperature measuring device for measuring T and a second width measuring device for measuring w, wherein the first temperature measuring device and the first width measuring device are arranged before a heating or a cooling path, and the second temperature measuring device and the second width measuring device are arranged after the heating or cooling path; and - an arithmetic unit for determining the ferritic
    Phase fraction x - ~ w ~ wxai aa (7i ~ 7'o) ~ waY (Ti ~ ^ o) + w χα1αγ (τ + W! Ay (T-r0) "_ w1 [-aa (r-r0) + ay (r-r0)] wherein the arithmetic unit is technically connected to the first temperature measuring device, the first width measuring device, the second temperature measuring device and the second width measuring device.
    An influence on the phase transformation during operation of the device according to the invention is possible if the cooling section has at least one cooling nozzle with an adjusting device or the heating path at least one heating element with an adjusting device, wherein the arithmetic unit is signal technically connected to the adjusting device, so that the ferritic phase portion can be adjusted ,
    The adjusting device can be designed as a valve, for example a rotary ball valve, in the case of a cooling section, through which the cooling medium flows (for example water, air or water, etc.) through the valve. In another embodiment, e.g. the speed of a centrifugal pump can be adjusted, whereby the pressure of the cooling medium can be adjusted.
    The adjusting device for adjusting the temperature in a heating section constructed as an induction furnace can be designed as a so-called frequency converter, so that the inductor of the induction furnace with variable frequency and / or voltage level assigned to the frequency converter is driven. As a result, the heating of the steel strip can be adjusted specifically.
    The setting device for setting the annealing temperature in a annealer can be designed as a valve, for example a ball valve with rotary drive, wherein the valve is flowed through either by an oxidizer (typically air or oxygen) or a fuel (eg fuel oil, natural gas etc.) , The oxygen carrier and the fuel are burned in the burner. Of course, there may also be an adjusting device for the oxygen carrier and the fuel, so that, for example, the quantitative ratio between oxygen and fuel is kept constant (for example in the vicinity of the stoichiometric ratio).
    It is expedient if there is a control device between the arithmetic unit and the setting device. For high accuracy, it is advantageous if a control device is arranged therebetween.
    It is advantageous if the heating or cooling section has at least two sections in the transport direction of the steel strip, a first temperature measuring device and a first width measuring device being arranged before each section and a second temperature measuring device and a second width measuring device arranged after each section, and each section a computing unit for determining the ferrite phase content xa. As a result, the phase transformation can also be determined within the sections of the heating or cooling section.
    It is particularly advantageous if each cooling section has at least one cooling nozzle with an adjusting device, and the arithmetic unit is signal-wise connected to the adjusting device, so that the ferritic phase fraction in the cooling section can be adjusted. As a result, the phase change 11/30 11 201301281
    Conversion within the cooling section can be specifically influenced, e.g. controlled or regulated.
    In order to prevent a falsification of the temperature measured values Ti and T by cooling water, it is advantageous if a blow-off device for blowing off the steel strip is arranged in front of the first and / or the second temperature measuring device. The blow-off device may be e.g. to act an air nozzle, which blows cooling water from the steel strip by compressed air.
    Brief description of the drawings
    Further advantages and features of the present invention will become apparent from the following description of non-limiting embodiments, wherein the following figures show:
    1 is a side view and a representation in the
    Plan view of a part of a hot rolling mill with an apparatus for carrying out the method according to the invention
    2 shows a side view of a part of a hot rolling mill with a variant of the device for carrying out the method according to the invention
    FIG. 3 shows a schematic representation of a temperature profile in a continuous annealing line for the intercritical annealing of a steel strip
    Description of the embodiments
    1 shows a rear part of a hot rolling mill for the production of a steel strip. Specifically, the hot rolling mill produces a steel strip 2 made of CK60 material with a thickness of 2 mm and a width of 1800 mm. The steel strip 2 is finish rolled in the last rolling mill 1 of the finishing train not fully shown in the austenitic state at 12/30 12 201301281 a temperature of ^ FM = 800 ° C and leaves the last stand 1 with a transport speed of, for example. 6 to 8 m / s. Immediately after the finish rolling, the temperature T ± of the steel strip 2 is detected by a first temperature measuring device 4a, specifically a pyrometer. At the same time, the width w1 of the steel strip 2 is detected by a first width measuring device 5a, which is designed here as a camera. Subsequently, the steel strip 2 is cooled in a cooling section 6, whereby the austenitic phase fraction y in the structure of the steel strip 2 at least partially converts into ferritic phase components a. The aim of the invention is to determine the degree of conversion y - * a in the cooling section 6 or after the cooling section (for example before winding in the winding device 3). For this purpose, the steel strip 2 is moved in the transport direction shown by the arrow through the cooling section 6 and thereby cooled. The cooling of the belt 2 is carried out by a plurality of cooling nozzles, which have not been shown separately. After the cooling path 6, the temperature T and the width w of the steel strip 2 are detected by a second temperature measuring device 4b, specifically a pyrometer or a thermal camera, and a second width measuring device 5b. Subsequently, the steel strip is wound by the winding device 3 to a reel (engl, coil).
    Knowing the temperatures and widths at at least two points of the strip before and after cooling and assuming a fully austenitic initial state and the coefficient of linear expansion for ferrite and austenite, the ferritic phase fraction xa can be determined. This is outlined below:
    The width w of a steel strip as a function of the temperature T is given by w = w0 [l + a (T - Γ0)], where w0 corresponds to the width of the steel strip at a reference temperature To of typically 20 ° C and a is the linear coefficient of thermal expansion. Of course, instead of the linear approach, a higher order polynomial approach may also be used. 13/30 13 201301281
    Since the austenitic phase y has a different coefficient of linear expansion αγ than a ferritic phase with a ^, the width of a steel strip having a ferritic phase portion x ^ (i) and the yt phase yy may be in a mixed batch such as to be written to wwn 1 + XyCCy (Γ-Γ0) + ^ χ®α® (Γ-Γ0)
    Assuming that only one ferritic phase a (typically ferrite) is present in the steel strip during cooling, the previous expression simplifies to w = w0 [1 + χγαγ (Τ - T0) + xa aa (T - T0) ]
    It is further known that the sum of the austenitic phase and all the ferritic phases is always 1, i.
    Xy + ^ X ^ = 1 i
    If there is only one ferritic phase, then χγ + xa = 1. For the case with only one ferritic phase, w = w0 [l + (1-xa) cCy (T-T0) + xa aa (T-70)] ]
    Thus, for the ferritic phase component, - - 1 - av (T - T0) _ w0 yy * a- (J_To) {aa_a
    The width w1 of the steel strip at a temperature Tx at austenitic rolling is given by wx = w0 [1 + ay (Tx-Γ0)] where ≦ xy is the coefficient of linear expansion of austenite. By combining the last two equations, _ w [1 + CtyiTy - Γρ)] - Wy - WyCCytT - Tp)
    WiK (T-T0) -ay (T-T0) 14/30 14 201301281
    Specifically, for w ± = 1.8m, αγ = 1 10-5 1 / K (see http://www.memory-metals.de/html/03_knowhow/PDF/MM_04_properties_d.pdf) and aa = 6 10 6 1 / K (see http://www.attempo.com/Daten/Kernmaterialien.pdf) from the last equation at T = 400 ° C and a width of w = 1,7923 m a ferritic phase fraction xa = 20%.
    2 shows a further side view of a rear part of another hot rolling mill for producing a steel strip 2. Herein, the temperature measured values Ti and T of the first and second temperature measuring devices 4a and 4b and the width measured values wi and w of the first and second width measuring devices 5a and 5b are symbolic shown.
    The measured values Ti, T, wi and w are processed in a computing unit 9, the actual value of the ferritic phase portion xa being determined taking into account further physical parameters of the steel. On the one hand, the actual value is displayed in a display unit 12, on the other hand, the actual value is fed to a control device 11, which by a target-actual comparison with a desired value of the sum of the ferritic phase components xa not shown Control deviation calculated. Depending on the control deviation, the control device outputs at least one manipulated variable u, which in an actual case is supplied to an electric motor M as an actuating device 8. Depending on the manipulated variable u, the motor M changes its rotational speed, which in turn influences the pressure of the cooling medium, which is supplied by the centrifugal pump 14 to the individual cooling nozzles 7 of the cooling section 6. This arrangement ensures that the actual value of the sum of the ferritic phase fractions in the steel strip 2 largely corresponds to the desired value, essentially independently of transient changes in the operation of the hot rolling mill. The two width measuring means 5a, 5b are formed in this embodiment as so-called line scan cameras below the belt 2. Not shown are the two designed as compressed air nozzles blow-off at the pyrometers 4a, 4b. 15/30 15 201301281
    3 shows an example of a schematic representation of the temperature control in a so-called continuous annealing line for producing a cold strip TRIP steel. In the entrance area of the plant, the width wi and the temperature Ti of the steel strip 2 present in an initial state A are measured. This is done by the first width measuring device 5a and the first temperature measuring device 4a. In the initial state A, the steel strip 2 contains ferritic and pearlitic phase components. Subsequently, the steel strip 2 is introduced into the heating line 15 formed as a anneal, wherein the steel strip 2 is heated. In the heating section 15, the steel strip is heated by a plurality of burners 16 arranged over the longitudinal extent of the heating section, as a result of which the ferritic constituents of the structure are partially converted into an austenitic structure. During annealing, the steel strip is in an intermediate state B characterized by the coexistence of ferritic and austenitic phases. The annealing temperature is adjusted at a certain throughput speed by the continuous annealing so that the actual austenite content in the steel strip before cooling corresponds as accurately as possible to the target specification. At the end of the heating section 15, in turn, the width w and the temperature T of the steel strip 2 present in the intermediate state B are measured; This is done by the second width measuring device 5b and the second temperature measuring device 4b. The actual austenite content is determined according to the method of determining the ferritic phase fraction xa after heating a steel strip taking into account w, wi, T, Ti, where the sum of the austenitic phase and all ferritic phases is always 1. Subsequently, the steel strip 2 is cooled in the cooling section 6, so that sets in the cooled steel strip 2, a preferably ferritic-bainitic (possibly with a martensitic remainder) structure with retained austenite islands. Immediately after the end of the cooling section 6, the width W2 and the temperature T2 of the steel strip 2 present in a final state C are measured; this is done by the third width measuring device 5c and the third temperature measuring device 4c. The determination of the phase fractions in the cooled steel strip 2 is carried out according to the method for determining the ferritic phase fraction xa after cooling of a steel strip taking into account wi, Ti, W2 and T2. 5
    Although the invention has been further illustrated and described in detail by the preferred embodiments, the invention is not limited by the disclosed examples, and other variations can be derived by those skilled in the art without departing from the scope of the invention. 17/30 17 201301281
    List of Reference Numerals 1 2 3 4 4a, 4b, 4c 5 5a, 5b, 5c 6 7 8 9 11 12 14 15 16
    rolling mill
    steel strip
    winding device
    Temperature measuring device first, second and third temperature measuring device width measuring device first, second and third width measuring device cooling section cooling nozzle
    setting device
    computer unit
    control device
    output unit
    rotary pump
    heating section
    Burner a Linear coefficient of thermal expansion T Temperature u Control value w Width x phase component xa Ferritic phase component Χγ Austenitic phase component A Initial condition: ferrite and perlite B Intermediate state: intercritical region (ferrite and austenite coexistence) C Final state: ferrite, bainite, martensite and residual
    Austenite 18/30
    权利要求:
    Claims (15)
    [1]
    Claims 1. A method for determining the ferritic phase fraction xa after heating or cooling a steel strip (2), comprising the steps of: measuring a width w1 and a temperature Ti of the steel strip (2), the steel strip (2) during the Measurements has a ferritic phase content xal; - Heating or cooling of the steel strip (2), wherein in the steel strip (2) during heating at least partially a phase transition α-> γ of a ferritic state a in the austenitic state γ and at least partially a phase transition from the austenitic state γ in a ferritic state a takes place; Measuring a width w and a temperature T of the at least partially converted steel strip (2); Determining the Ferritic Phase Component xa by: -w-wxai ctg (T1-ro) -way (T1-r0) + wxal «Y (T1-To) + w1 + w1 αγ (Τ-Γ0)" ~~ Wl [- ag (T-T0) + aY (T-T0)] 'where T0 is a reference temperature, and aa and αγ are the linear thermal expansion coefficients of ferrite and austenite.
    [2]
    2. A method for determining the ferritic phase fraction xa after heating a steel strip (2) according to claim 1, characterized by - measuring the width and the temperature T ± of the steel strip (2), wherein the steel strip (2) during the measurements completely in a ferritic state with xal = 1; - Heating the steel strip (2), wherein in the steel strip (2) at least partially takes place a phase transformation a γ of the ferritic state a in the austenitic state γ; Measuring a width w and a temperature T of the at least partially converted steel strip (2); Determining the ferritic phase fraction xa by -w-waa (T-1-T0) + w1 + w1 ay (T-Γ0) Wi [-aa {T-T0) + αγ (Τ-T0j 19/30 19 201301281
    [3]
    3. The method according to any one of the preceding claims, characterized in that the steel strip (2) before, preferably immediately before, the measurement of the width w ± and the temperature T ± is cooled in a cooling section.
    [4]
    4. The method according to any one of the preceding claims, characterized in that the measurement of the width w and the temperature T of the at least partially converted steel strip (2) takes place during or after the annealing.
    [5]
    5. The method according to claim 4, characterized in that the annealing time and / or the annealing temperature is set during annealing in dependence on the ferritic phase component xa.
    [6]
    6. The method according to claim 5, characterized in that the annealing time and / or the annealing temperature is controlled or regulated adjusted.
    [7]
    7. A method for determining the ferritic phase fraction xa after cooling a steel strip (2) according to claim 1, characterized by - measuring the width wx and the temperature Tx of the steel strip (2), wherein the steel strip (2) during the measurements completely in the austenitic state with xal = 0; - cooling the steel strip (2), wherein in the steel strip (2) at least partially a phase transformation from the austenitic state y to a ferritic state a takes place; Measuring a width w and a temperature T of the at least partially converted steel strip (2); Determining the Ferritic Phase Component xa by -w-w αγ (T1-T0) + w-1 + w-1 αγ (Τ-Γ0) w ± [-aa (T-Τ0) + αγ (Τ-T0)]
    [8]
    8. The method according to any one of claims 1 and 7, characterized in that the steel strip (2) before, is preferably hot rolled before measuring the width wx and the temperature Tx before 20/30 20 201301281.
    [9]
    9. The method according to any one of claims 1 and 7 to 8, characterized in that the measurement of the width w and the temperature T of the at least partially converted steel strip (2) takes place during or after cooling in a cooling section (6).
    [10]
    10. The method according to claim 9, characterized in that the cooling is set in dependence of the ferritic phase portion xa.
    [11]
    11. The method according to claim 11, characterized in that the cooling time and / or the cooling intensity is set controlled or regulated during the cooling.
    [12]
    12. Computer program product for carrying out the method according to one of the preceding claims, characterized in that the computer program values for the width wx and the temperature Tx before the at least partial phase transformation, the width w and the temperature T of the steel strip after the at least partial phase transformation, and physical Parameters of the steel strip can be fed, and the computer program product has a calculation module for calculating the ferritic phase component xa x "= - up has.
    [13]
    13. Device for determining the ferritic phase fraction xa after heating or cooling of a steel strip (2), in particular for carrying out the method according to one of claims 1 to 11, comprising - a first temperature measuring device (4a) for measuring Tx and a first width measuring device ( 5a) for measuring wx; a second temperature measuring device (5a) for measuring T and a second width measuring device (5b) for measuring w, the first temperature measuring device (4a) and the first width measuring device (5a) in front of a heating section or a cooling section (6), and the second temperature measuring means (4b) and the second width measuring means (5b) are arranged after the heating path or the cooling path (6); - A calculation unit (9) for determining the ferritic ™ _________ j__j η _WW xal aa (r1-r0) -w aY (T1-r0) + w xalay (T1-r0) + w1 + w1 αγ (Τ-Τ0 ) L · n 9. ss ώ 3. n "cs j__l sx" ^. Ι [-αα (Τ-Τ0) + αγ (Τ-Τ0) wherein the arithmetic unit (9) signal with the first temperature measuring device (4a), the first width measuring device (5a), the second temperature measuring device (4b) and the second width measuring device (5b) is connected.
    [14]
    14. The device according to claim 13, wherein the cooling section (6) has at least one cooling nozzle (7) with an adjusting device (8) or the heating path at least one heating element with an adjusting device (8), characterized in that the arithmetic unit (9) with signaling technology the adjusting device (8) is connected, so that the ferritic phase component can be adjusted.
    [15]
    15. The device according to claim 14, characterized in that between the arithmetic unit (9) and the adjusting device (8) a control device or a control device (11) is arranged, wherein the control or regulating device (11) signal technically with the arithmetic unit (9) and the adjusting device (8) is connected. 22/30
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    法律状态:
    2015-07-15| PC| Change of the owner|Owner name: PRIMETALS TECHNOLOGIES AUSTRIA GMBH, AT Effective date: 20150520 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT3712013A|AT513750B1|2013-05-03|2013-05-03|Determination of the ferritic phase components during cooling of a steel strip|
    ATA50620/2013A|AT514380B1|2013-05-03|2013-09-26|Determination of the ferritic phase content after heating or cooling of a steel strip|ATA50620/2013A| AT514380B1|2013-05-03|2013-09-26|Determination of the ferritic phase content after heating or cooling of a steel strip|
    CN201480025062.6A| CN105408505B|2013-05-03|2014-04-04|Ferritic phase component is determined after steel bar is heated or cooled|
    KR1020157031599A| KR102226160B1|2013-05-03|2014-04-04|Determining the ferrite phase fraction after heating or cooling of a steel strip|
    RU2015141153A| RU2679154C2|2013-05-03|2014-04-04|Determining ferrite phase fraction after heating or cooling of steel strip|
    PCT/EP2014/056779| WO2014177341A1|2013-05-03|2014-04-04|Determining the ferrite phase fraction after heating or cooling of a steel strip|
    BR112015027205A| BR112015027205B1|2013-05-03|2014-04-04|process and device for determining the xalpha ferritic phase fraction, after heating or cooling a steel strip|
    US14/888,821| US10655197B2|2013-05-03|2014-04-04|Determining the ferrite phase fraction after heating or cooling of a steel strip|
    EP14718355.2A| EP2992117B1|2013-05-03|2014-04-04|Determining the ferrite phase fraction after heating or cooling of a steel strip|
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