JP5391786B2 - Steel plate shape correction method and apparatus - Google Patents

Steel plate shape correction method and apparatus Download PDF

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JP5391786B2
JP5391786B2 JP2009092256A JP2009092256A JP5391786B2 JP 5391786 B2 JP5391786 B2 JP 5391786B2 JP 2009092256 A JP2009092256 A JP 2009092256A JP 2009092256 A JP2009092256 A JP 2009092256A JP 5391786 B2 JP5391786 B2 JP 5391786B2
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transformation
temperature
shape
steel sheet
heating
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JP2010240691A (en
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貴之 大塚
透 明石
茂 小川
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新日鐵住金株式会社
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  The present invention relates to a steel plate shape correction method and apparatus suitable for correcting the shape of a rolled steel plate having a defective shape by utilizing transformation superplastic deformation and creep deformation.
  About the steel plate after rolling, in any case of a thick plate and a thin plate, a shape defect may occur, such as warpage in the width direction and the rolling direction, and a wave shape. For steel plates with such shape defects, correct the shape with a straightening device such as skin pass rolling for thin plates after hot rolling or cold rolling, and correct the shape with a straightening device such as a cold leveler or oil leveler for thick steel plates. It is common.
  However, especially for high-strength steel sheets, a high reduction load is required to perform such shape correction, which leads to material deterioration and, ultimately, poor shape due to the load limit and torque limit on the equipment. In some cases, it could not be resolved, which in turn resulted in yield deterioration and productivity deterioration.
For this reason, Patent Document 1 discloses a technique for hot-correcting a thick steel plate after hot rolling is completed. Specifically, the correction is performed when the average temperature in the steel sheet surface is within the range from the transformation start temperature Ar 3 or higher to the transformation end temperature Ar 1 of the steel type. That is, a large correction effect is expected by predicting the transformation start point in the cooling process after completion of rolling and applying a hot leveler during transformation.
Moreover, the technique which corrects the rolled shape steel is also disclosed in Patent Document 2. According to the disclosed technique of Patent Document 2, correction is made at a temperature in the transformation range Ar 1 to Ar 3 , and it is mentioned that warpage and residual stress generated in the material can be eliminated. .
  Each of the disclosed techniques of Patent Documents 1 and 2 is a processing method that utilizes a softening phenomenon during transformation during cooling, that is, transformation superplasticity. In addition to Patent Documents 1 and 2 described above, systematic research has been conducted on Non-Patent Documents 1 and 2 regarding transformation superplastic phenomena.
However, according to the technique disclosed in Patent Document 1, hot correction is performed in the process of cooling the steel sheet after hot rolling. For this reason, it is necessary to apply hot correction at a delicate timing in relation to the transformation start temperature Ar 3 during cooling, and it is difficult to adjust the timing. Further, if the timing for applying hot correction is incorrect, the correction effect is completely obtained. In addition, there is a problem in that equipment damage is caused by rapid hardening of the material. Similarly, in the disclosed technique of Patent Document 2, it is very difficult to control transformation during cooling, and the material may suddenly harden due to a prediction error of the transformation point, often resulting in a decrease in shape correction capability and equipment damage. It was.
  In addition, since the transformation techniques of Patent Documents 1 and 2 have already finished transformation at the time of shape correction, it is difficult to control the transformation structure by cooling control after shape correction or to secure the material of the steel plate. The problem of becoming.
  On the other hand, Patent Documents 3 to 5 disclose structure refinement using α → γ transformation.
Japanese Patent Laid-Open No. 08-300040 JP 2000-24715 A Japanese Patent Publication No.62-7247 Japanese Examined Patent Publication No.62-39228 Japanese Patent Laid-Open No. 10-8142
G. W. Greenwood, Proc, Roy, Soc, London, 283A, 403 (1965), pp.403--422 Miyao, Materials, 35, No.399 (1986) pp. 1352-1357
Therefore, the present invention has been devised to solve the above-mentioned problems, and the object of the present invention is that the temperature control and transformation control are very easy in the austenite transformation by heating, The temperature range Ac 1 to Ac 3 + 50 ° C. or lower is generally higher than the range of Ar 1 to Ar 3 which is the transformation temperature range during cooling. Therefore, transformation to superplastic deformation occurs during austenite transformation by heating. In addition, it has been found that the shape correction effect is increased by accompanying creep deformation, and further, transformation superplasticity that can simultaneously correct the shape of the steel sheet and improve the material quality by achieving grain refinement by austenite transformation Another object of the present invention is to provide a method and apparatus for correcting the shape of a steel sheet using creep deformation.
In order to solve the above-mentioned problems, the method for correcting the shape of a steel sheet according to claim 1 reheats the steel sheet after rolling and cooling to a temperature not lower than the transformation start temperature Ac 1 point and the transformation end temperature Ac 3 point + 50 ° C. or lower. Inducing austenite transformation, applying a tensile load while the transformation is in progress, causing transformation superplastic deformation and creep deformation, and using the generated transformation superplastic deformation and creep deformation to correct the shape of the steel sheet. It is characterized by performing.
In order to solve the above-described problems, the method for correcting the shape of a steel sheet according to claim 2 reheats the steel sheet after rolling and cooling to a temperature that is not lower than the transformation start temperature Ac 1 point and transformation end temperature Ac 3 point + 50 ° C. or lower. The austenite transformation is induced during heating and soaking to a temperature of one or more points of the Ac, and the superplastic deformation and creep deformation are generated by applying a tensile load to the steel plate while the transformation is in progress. The shape correction of the steel sheet is performed using the transformed superplastic deformation and creep deformation.
  According to a third aspect of the present invention, there is provided the method for correcting the shape of a steel sheet according to the first or second aspect, wherein uniform accelerated cooling is performed after the heating or the soaking.
The shape correction device for a steel sheet according to claim 4 is a heating means for heating the steel sheet after rolling and cooling to a temperature not lower than the transformation start temperature Ac 1 point and the transformation end temperature Ac 3 point + 50 ° C. or lower, and being heated by the heating means. And a load-loading means for generating transformation superplastic deformation and creep deformation by applying a tensile load to the steel sheet, and correcting the shape of the steel sheet using the generated transformation superplastic deformation and creep deformation. It is characterized by.
The shape straightening device according to claim 5 is a heating means for heating the steel sheet after rolling and cooling to a temperature not lower than the transformation start temperature Ac 1 point and the transformation end temperature Ac 3 point + 50 ° C. or lower, and the above Ac 1 point or higher temperature. A load-loading means for generating transformation superplastic deformation and creep deformation by applying a tensile load to the steel plate during soaking, and correcting the shape of the steel plate using the generated transformation superplastic deformation and creep deformation; It is characterized by providing.
  The shape correction device according to claim 6 is the invention according to any one of claims 4 and 5, wherein a uniform acceleration cooling device is installed immediately after the heating device or the heat equalizing device. And
According to the present invention having the above-described configuration, a tensile load is applied to the steel sheet in a temperature range of the transformation start temperature Ac 1 point or more and the transformation end temperature Ac 3 point + 50 ° C. or less, thereby causing the steel sheet to undergo phase transformation, so-called It is possible to cause transformation superplastic deformation and to generate creep deformation that occurs in a high temperature range. By utilizing this transformation superplastic deformation and creep deformation and continuously applying a tensile load to the steel plate that has been warped or locally deformed, it becomes possible to stretch the steel plate and eliminate these shape defects. Moreover, in addition to the effect of eliminating the shape defect by the same operation, the residual stress of the steel sheet can be removed. Sufficient elongation to eliminate shape defects and residual stress depends on the shape of the plate before straightening, but in most cases a range of 0.1% to 2% is sufficient. This elongation is such that it can be sufficiently added by transformation superplastic deformation and creep deformation. Moreover, according to this invention, since the austenite transformation by heating is caused with correction of these shape defects, the effect of crystal grain refinement described in, for example, Patent Documents 3 to 5 can be achieved at the same time. Furthermore, the present invention is very easy to control the temperature as compared with the case where a load is applied in the middle of cooling as in the prior art in that it uses a transformation during heating or soaking, and the material It is possible to improve the desired material by further miniaturizing the crystal grain size.
It is a figure which shows the structural example of the shape correction apparatus for implement | achieving the shape correction method of the steel plate to which this invention is applied. It is a figure which shows the structural example of the other shape correction apparatus for implement | achieving the shape correction method of the steel plate to which this invention is applied.
  Hereinafter, as a best mode for carrying out the present invention, a shape correction method for correcting a rolled steel sheet having a shape defect will be described in detail with reference to the drawings.
  Fig.1 (a) has shown the structural example of the shape correction apparatus 1 for implement | achieving the shape correction method of the steel plate to which this invention is applied. This shape correction device 1 has a shape defect such as warping at the end or partial deformation from the thick plate after being rolled and cooled in the thick plate rolling line. This is a device for selecting a thick plate and correcting the shape only for the thick plate. Whether or not a shape defect has occurred may be determined using any conventionally known standard.
  The shape correcting device 1 includes a first pinch roll 11 and a second pinch roll 12, and a heating device 13 and a heat equalizing device 14 are provided between the first pinch roll 11 and the second pinch roll 12. The uniform acceleration cooling device 15 is provided in order.
The first pinch roll 11 and the second pinch roll 12 are configured such that cylindrical rotary rolls are formed up and down, and a steel plate 2 having a shape defect can be sandwiched between the rotary rolls. The first pinch roll 11 and the second pinch roll 12 are each rotated in the direction of the arrow in the figure after sandwiching the steel plate 2 to be shape-corrected. As a result, the steel plate 2 is conveyed in the direction A. At this time, it is possible to apply a tensile load to the steel plate 2 by reducing the rotation speed of the first pinch roll 11 with respect to the second pinch roll 12.
The heating device 13 is an induction heating device, and can uniformly heat the steel plate 2 to an arbitrary temperature. The heating device 13 can heat the steel plate 2 to be straightened to a temperature of at least the transformation start temperature Ac 1 point and the transformation end temperature Ac 3 point + 50 ° C. or less. By this heating device 13, the steel plate 2 is gradually heated from the first pinch roll 11 toward the second pinch roll 12 to become a high temperature. Further, the uniform acceleration cooling device 15 is provided with a cooling water nozzle, and is a device capable of cooling the steel plate 2 uniformly in the width direction in an accelerated manner. The soaking device 14 is provided with a roof burner so that the steel plate 2 can be soaked and heated.
The shape correction device 1 having such a configuration is heated by the heating device 13 to a temperature not lower than the transformation start temperature Ac 1 point and transformation end temperature Ac 3 point + 50 ° C. or lower. In addition, while maintaining the temperature uniform by the heat equalizing device 14, the first pinch roll 11 and the second pinch roll 12 apply a tensile load of 5 MPa or more and 200 MPa or less, preferably 20 MPa or more and 60 MPa or less. To do. The steel sheet whose shape has been straightened is uniformly and rapidly cooled by the cooling device 15 and then passes through the pinch roll 12 to release the applied tension. A draining device (not shown) is provided before and after the cooling device 15.
By applying a tensile load to the steel plate 2 by the first pinch roll 11 and the second pinch roll 12 in the temperature range of the transformation start temperature Ac 1 point or more and the transformation end temperature Ac 3 points + 50 ° C. or less, the steel plate 2 is It is possible to cause phase transformation to cause so-called transformation superplastic deformation. This transformation superplastic deformation is a phenomenon that causes plastic deformation even if the stress applied to the material during the progress of the phase transformation caused by heating the steel plate 2 to the above temperature range is a stress below the yield stress, Also called transformation plasticity. In addition, creep deformation also develops at the same temperature range. By utilizing this transformation superplastic deformation and creep deformation and stretching the steel plate 2 that has been warped or locally deformed, it is possible to eliminate these shape defects. Note that according to the present invention, have a maximum of Ac 3 point + 50 ℃ below the heating temperature of the steel plate 2. This is because if this heating temperature exceeds Ac 3 point + 50 ° C., the grain growth further progresses, and it becomes impossible to expect improvement in the material quality of the steel sheet due to the refinement. At this time, it is desirable to heat this heating temperature to Ac 3 point or higher. The reason is that if it is less than Ac 3 , the transformation superplasticity may not be completed, and the expected effect may be diminished. In addition, about this heating temperature, it is desirable to make Ac 3 point +10 degrees C or less into an upper limit further. The reason is that if the temperature exceeds Ac 3 point + 10 ° C., it takes a long time to lower the temperature, and the work efficiency is deteriorated.
FIG. 1 (b) corresponds to the position of the steel plate in FIG. 1 (a), a preferable temperature history for realizing the present invention, a volume fraction transition of the austenite phase generated by the temperature transition, and a transformation. Superplastic strain and creep strain are shown. The steel sheet is heated in a heating zone from room temperature to a temperature of Ac 3 points + 10 ° C., and is soaked in the soaking zone at Ac 3 points + 10 ° C. The steel plate undergoes austenite transformation in the heating zone and the soaking zone, but since the steel plate 2 is loaded with tensile stress during this time, transformation superplastic strain and creep strain occur. The shape of the steel plate 2 is corrected by transformation superplastic strain and creep strain, or the residual stress is removed, further grain size refinement by austenite transformation is performed, and then uniform accelerated cooling is performed, so that the austenite almost disappears. Here, the uniform accelerated cooling desirably has a temperature distribution within 10 ° C. in the width direction and a cooling rate of 30 ° C. or more per second. During uniform accelerated cooling, transformation superplastic deformation occurs like heating, and the occurrence of residual stress and shape defects due to cooling is suppressed. Further, by adjusting the accelerated cooling rate optimally, the crystal grains can be further refined and the target structure can be created.
  FIG. 2 shows a configuration example of another shape correcting device 3 for realizing the shape correcting method of the steel sheet to which the present invention is applied. In the shape correction device 3, the same components and members as those of the shape correction device 1 described above are denoted by the same reference numerals, and the following description is omitted.
  This shape correction device 3 is warped or partially deformed from a thin plate after being subjected to rough rolling and finish rolling in a hot rolling line, and further cooled and wound on a coil. It is an apparatus for selecting a thin plate in which a shape defect such as the above occurs and correcting the shape only for the thin plate. Whether or not a shape defect has occurred may be determined using any conventionally known standard.
  The shape correction device 3 includes a coil rewinding unit 31 and a coil winding unit 32, and a heating device 13 and a heat equalizing device 14 are sequentially provided between the coil rewinding unit 31 and the coil winding unit 32. ing.
  The coil rewinding part 31 is formed with a core 36 on which the coil 5 that is considered to have a defective shape is mounted. One end of the steel plate 8 of the coil 5 attached to the core 36 passes between the heating device 13 and the soaking device 14 and is attached to the core 37 in the coil winding portion 32. Under this state, the coil winding portion 32 is rotated in the direction of the arrow in the drawing, whereby the steel plate 8 of the coil 5 attached to the coil rewinding portion 31 is wound by the coil winding portion 32. It will be.
At this time, by slightly increasing the rotational speed of the coil winding unit 32 or by adjusting the rotational speed of the coil rewinding unit 31 slightly lower than that of the coil winding unit 32, In the winding process of the steel plate 8 by the take-up portion 32, a tensile load can be applied. That is, the steel plate 8 in the heating device 13 and the soaking device 14 is heated from at least the transformation start temperature Ac 1 point to the transformation end temperature Ac 3 point + 50 ° C. or less, and one end is coiled. The other end of the return portion 31 is fixed to the coil winding portion 32 and a tensile load is applied. Similarly, the tensile load applied to the steel plate 8 is a tensile load of 5 MPa or more and 200 MPa or less, preferably 20 MPa or more and 60 MPa or less.
That is, by applying a tensile load to the steel plate 8 by the coil unwinding portion 31 and the coil winding portion 32 in the temperature range of the transformation start temperature Ac 1 point or more and the transformation end temperature Ac 3 points + 50 ° C. or less, the steel plate 8 is It is possible to cause phase transformation to cause so-called transformation superplastic deformation. In addition, creep deformation occurs simultaneously in the temperature range. By utilizing this transformation superplastic deformation and creep deformation, the steel sheet 8 that has been warped or locally deformed is stretched to eliminate these shape defects.
According to the present invention, for example, in any of the above embodiments, the above-described shape is obtained by heating the steel sheet to be straightened from the transformation start temperature Ac 1 point or more to the transformation end temperature Ac 3 points + 50 ° C. or less. In addition to correcting defects, it is possible to reduce the crystal grain size of the material. That is, according to the present invention, it is possible to simultaneously perform shape correction and material improvement by transformation structure control.
In addition, according to the present invention, a predetermined tensile load is applied in the temperature range of the transformation start temperature Ac 1 point or more and the transformation end temperature Ac 3 points + 50 ° C. or less, and both temperature control and load control are optimally controlled. Is required. In the present invention, since the austenite transformation is caused by heating to the transformation temperature range, temperature control is very easy as compared with the case where a load is applied during cooling as in the prior art.
  In addition, according to the present invention, uniform accelerated cooling is performed after heating or soaking, and in addition to shape correction by transformation superplastic deformation and creep deformation, material refinement of the steel sheet accompanying fine graining and steel structure control is realized at the same time. It may be. In such a case, it is possible to install a uniform acceleration cooling device immediately after the heating device or the soaking device, and perform shape correction by transformation superplastic deformation and creep deformation. As a result, in addition to the shape correction, it is possible to simultaneously realize the improvement of the material quality of the steel sheet accompanying fine graining and the creation of the target steel structure.
The present invention is not limited to the embodiment described above. For example, for thick and thin steel plates having residual stress, regardless of whether or not shape defects occur, the steel sheet after rolling and cooling has a transformation start temperature Ac of 1 point or higher and a transformation end temperature Ac of 3 points + 50 ° C. or lower. It is possible to remove the residual stress through transformation superplasticity and creep generated by heating to a temperature and further applying a tensile load to the steel sheet. Such residual stress removal is based on exactly the same principle and method as in the case of correcting a steel sheet in which a shape defect has occurred.
That is, the present invention heats the steel sheet after rolling and cooling to a temperature not lower than the transformation start temperature Ac 1 point and the transformation end temperature Ac 3 point + 50 ° C. or lower, and further causes transformation superplasticity generated by applying a tensile load to the steel plate. Further, the method may be embodied as a method for removing the residual stress of the steel sheet, in which the residual stress of the steel sheet is removed through creep.
Further, the present invention heats the steel sheet after rolling and cooling to a temperature not lower than the transformation start temperature Ac 1 point and the transformation end temperature Ac 3 point + 50 ° C. or lower, and is applied to the steel plate during soaking at a temperature not lower than Ac 1 point. The present invention may be embodied as a method for removing residual stress of a steel sheet in which residual stress of the steel sheet is removed through transformation superplasticity and creep caused by loading.
  As a result, the residual stress remaining in the steel sheet can be removed for the reason described above.
  In order to verify the effectiveness of the above-described method for correcting the shape of a steel sheet according to the present invention, a verification experiment described below was performed.
  First, the shape correction device 3 is manufactured. The heating device 13 has a length of 1 m, the soaking device 14 has a length of 2 m, and each can be heated up to 1000 ° C. The heating method of the heating device 13 and the soaking device 14 are both electromagnetic induction methods.
  Table 1 shows examples of the steel sheet to be actually subjected to shape correction and various conditions.
  The steel type is a high-tensile hot-rolled sheet having a tensile strength of 1000 MPa, and this component is 0.6% by mass, 2.0% Si, and 3.0% Mn.
  The plate thickness of the steel plate is 1 mm, the plate width is 200 mm, and the coil length is 50 m.
  As correction conditions, the heating device 13 is heated to 820 ° C., and the soaking device 14 is kept at a substantially uniform temperature of 820 ° C. The tensile load is set to 30 MPa by the coil rewinding part 31 and the coil winding part 32. The plate passing speed is 1 mpm.
  As a result, the steel plate having a wave height of 10 mm before correction was able to reduce the wave height to 1 mm or less after correction, and the steepness improved from 0.1% to 0.01%.
  Moreover, when the cooling device 15 was installed immediately after the pinch roll 12 of the shape correction device 3 and the crystal grain size before and after the correction was measured, the crystal particle size that was about 3 to 4 μm before the correction was corrected. After that, it was about 1 μm, and the effect of refining crystal grains could be confirmed.
DESCRIPTION OF SYMBOLS 1, 3 Shape correction apparatus 2, 8 Steel plate 11 1st pinch roll 12 2nd pinch roll 13 Heating apparatus 14 Heat equalization apparatus 15 Uniform acceleration cooling apparatus 31 Shape correction apparatus 32 Coil winding part 36 Core of coil rewinding part 37 Core of coil winding part

Claims (6)

  1. The steel sheet after rolling and cooling is reheated to a temperature of transformation start temperature Ac 1 point or higher and transformation end temperature Ac 3 point + 50 ° C. or lower to induce austenite transformation, and a tensile load is applied to the steel plate during the transformation. To cause transformation superplastic deformation and creep deformation,
    A method for correcting the shape of a steel sheet, wherein the shape correction of the steel sheet is performed using the generated transformation superplastic deformation and creep deformation.
  2. The steel sheet after rolling and cooling is reheated to a temperature not lower than the transformation start temperature Ac 1 point and the transformation end temperature Ac 3 point + 50 ° C. or lower,
    Austenite transformation is induced during heating and soaking to a temperature of one or more points of the Ac, and a transformation superplastic deformation and a creep deformation are generated by applying a tensile load to the steel plate during the transformation.
    A method for correcting the shape of a steel sheet, wherein the shape correction of the steel sheet is performed using the generated transformation superplastic deformation and creep deformation.
  3.   3. The method for correcting the shape of a steel sheet according to claim 1, wherein uniform accelerated cooling is performed after the heating or the soaking.
  4. Heating means for heating the steel sheet after rolling and cooling to a temperature not lower than the transformation start temperature Ac 1 point and the transformation end temperature Ac 3 point + 50 ° C. or lower;
    A load that causes transformation superplastic deformation and creep deformation by applying a tensile load to the steel plate during heating by the heating means, and corrects the shape of the steel plate using the generated transformation superplastic deformation and creep deformation. A shape correction device for a steel sheet, comprising: a load means.
  5. Heating means for heating the steel sheet after rolling and cooling to a temperature not lower than the transformation start temperature Ac 1 point and the transformation end temperature Ac 3 point + 50 ° C. or lower;
    The shape of the steel sheet using transformation superplastic deformation and generates a creep deformation, transformation superplastic deformation and creep deformation is the generated by loading a tensile load to the steel plate to heat stroke equalizing above Ac 1 point or more temperature A shape correction device for a steel sheet, comprising: a load loading means for performing correction.
  6. The steel plate shape correction device according to any one of claims 4 and 5, wherein a uniform acceleration cooling device is installed immediately after the heating device or the soaking device.
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