JP3520646B2 - Manufacturing method for section steel - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an H-beam, an I-beam,
The present invention relates to a method of manufacturing a section steel such as a channel section steel, and particularly to a method of manufacturing a section steel having excellent dimensional accuracy and shape by hot rolling and online cold straightening. [0002] Sectional steels such as H-section steels are generally produced by hot rolling using a double rolling mill and a universal rolling mill, and then are subjected to a roller straightening machine to correct bending and warping. . In this case, as problems in manufacturing the shaped steel, there are a problem of dimensional accuracy and shape defect at the time of rolling and a problem of shape defect at the time of roller straightening. First, an example of a dimensional defect in the case of an H-section steel is shown in FIG. FIG. 3A shows what is called the center deviation of the web.
This is a phenomenon in which the zero web 101 shifts up or down with respect to the center of the flange 102. This is mainly due to an improper position of the web with respect to the pass line in the universal rolling mill, and it is generally inevitable that the center of the web is deviated. Web center deviation S
Is defined by the following equation. S = | ab | / 2, where a and b are the distance between the flange end and the web surface. Next, FIG. 3B shows what is called flange thickness unevenness. This is a phenomenon in which a difference between the left and right or upper and lower flange thicknesses occurs. This mainly occurs at an early or middle stage of rolling mainly due to an inappropriate shift amount of the upper and lower horizontal rolls due to a change in the web height. When such flange thickness deviation occurs, the rolling reduction of each flange changes after the middle stage of rolling, so that the center deviation of the web occurs. FIG. 3C relates to a change in the flange width. The front and rear ends of the material to be rolled are not restricted by the material, and the intermediate portion is more easily extended than the front and rear ends. This is a phenomenon in which the width becomes smaller. This phenomenon remains in the product after straightening (because the front and rear ends are not straightened at the time of straightening), and in the final product stage, the increase amount ΔB of the flange width in the middle part is about 1 to 3 mm. This phenomenon may be reversed (the flange width at the front and rear ends is large) depending on the rolling method or the like. Among the problems of the dimensional accuracy described above, there have been proposed many methods for reducing the center deviation of the web, such as Japanese Patent Publication No. Hei 6-53289 and Japanese Patent Laid-Open Publication No. Hei 6-218413. For example, in the method disclosed in the former publication, a web or flange roller guide device is provided on the entrance side of the universal rolling mill, and a center deviation measuring device for the web is provided on the entrance side or exit side, and the measurement of the measuring device is performed. Based on the data, the vertical position of the roller guide device is separately adjusted on the mill driving side and the mill operating side. The latter publication discloses an apparatus in which guide blocks of flanges are provided on guide blocks positioned above and below a web. In each case, the center deviation of the web is reduced by individually adjusting the vertical position of the roller guide device with respect to the pass line. Next, FIG. 4 shows an example of a shape defect at the time of straightening the roller. (A) is a vertical bending, (B) is a horizontal bending, (C) is one or both of the flanges falling (warping), and (D) is an end (particularly a top in the rolling direction). Is shown. FIG. 5 shows an example of the web height variation caused by the roller straightener. The web height variation ΔH in the middle portion is usually in the range of 1.0 to 3.0 mm. The causes of the occurrence of such a shape failure of the H-section steel and the problems in the conventional countermeasures against the shape failure are as follows. [0009] The end of the rolled material, particularly the top in the rolling direction, is subject to the rolling method (difference in elongation between flange and web).
Inevitably, it becomes an unsteady part. In addition, the temperature tends to be low, and further, when biting into the rolling roll, the biting position is likely to be inappropriate, so that the rolled material comes into contact with a guide or the like, as shown in FIG. End bending occurs.
Even if you try to straighten this end bend with a roller straightener,
As shown in FIG. 6, since the straightening rolls 11 are staggered up and down, straightening cannot be performed, and the top portion 101 of the H-section steel 100 is an uncorrected portion. Therefore, the correction of the top part 101 can be performed only offline. Regarding the bending in the longitudinal direction shown in FIG. 4A, there is a temperature difference between the thick flange portion and the thin web portion at the rolling stage. Otherwise (generally, unless forced cooling or the like is carried out, heat is trapped between the lower flange portions of the H-section steel, so that the lower flange temperature is high), so that bending in the vertical direction particularly occurs. In addition, during the cooling after the end of the rolling, particularly in the case of cooling in the I-shaped posture (in general, the cooling floor is charged in the I-shaped state due to the loading efficiency of the cooling floor), as shown in FIG. Depending on the degree of close contact between the charging rows, bending in the left-right direction may occur (FIG. 4B). Conventionally, as a means for suppressing such bending, there have been many methods of reducing the temperature difference from the web portion by water cooling the flange portion during rolling (Japanese Patent Publication No. 6-75734, Japanese Unexamined Patent Application Publication No.
Conversely, if the water cooling of the flange portion is not proper, a new shape defect such as a flange fall (inward warp or outward warp of the flange) as shown in FIG. 4C occurs. Regarding the shape failure of the H-section steel and the fluctuation of the web height shown in FIGS. 4 and 5, the shaft adjustment / width adjustment mechanism of the roller straightener RS is configured as shown in FIG. The H-shaped steel 100 is straightened after adjusting the axial spacing of the arranged horizontal straightening rolls 11 in the direction of the roll axis 13 by adjusting the thrust and the roll width, and adjusting the width of the vertical straightening rolls 12 arranged on the left and right sides. However, since the top part 101 and the bottom part 102 of the H-shaped steel 100 cannot be corrected due to the mechanism of the roller straightening machine 10, the top part 1 and the bottom part
The web height dimension H of the first and bottom portions 102 hardly fluctuates before and after the correction, and becomes larger than before the correction except for the end portions. The fluctuation amount ΔH of the web height is usually 1.0 to
It is 3.0 mm, and off-line work (press straightening, cutting, etc.) is required for a part outside the standard dimensions. The dimensional accuracy of an H-section steel or the like must be realized in a series of rolling steps including a rough rolling step, an intermediate rolling step, and a finish rolling step. As in the past, if only the individual control is performed in each rolling process alone, the amount of correction of dimensional fluctuation also has a certain limit value, that is, there is a limit value for each factor affecting the improvement of dimensional accuracy. It was something I could not hope for. Also, as for the shape defect, there is naturally a limit in the control value for suppressing the shape defect on-line, so that at present, there is no effective suppression means. The present invention has been made in view of the above situation, and aims to improve the dimensional accuracy of a shaped steel in a series of rolling steps, and to realize on-line roller correction with less shape defects. And According to the present invention, there is provided a method for producing a section steel according to the present invention, comprising: a breakdown mill, a coarse universal mill, a rough rolling step by a coarse edger mill, an intermediate rolling step by an intermediate universal mill and an intermediate edger mill, and Rolling the material to be rolled through a finish rolling step by a finish universal mill, and then, in a method of manufacturing a shaped steel in which the finish material is straightened by a roller straightening machine, the entrance side or the entrance side of the intermediate universal mill and the finish universal mill. A guide device for guiding the material to be rolled is provided on the entry side, and a constraint guide device for guiding the material to be rolled while being restrained is provided on the exit side of the finishing universal mill, and the size and shape of the material to be rolled or the material to be corrected are provided. Dimension meter for measuring the inlet or outlet of the intermediate universal mill or Are provided on both sides, the exit side of the finishing universal mill, and the entrance side or exit side or both sides of the roller straightening machine, respectively, and are optimally controlled based on measurement data provided by dimensioners provided on the entrance side and exit side of the universal mill. The optimum instruction value is determined by the system, and the rolling reduction value of each mill, the adjustment value of the horizontal roll thrust, the adjustment value of the short stroke of the edger mill, and the guide setting value of the guide device (the pass line, width and height of the guide. The same is controlled between passes or between bars to roll the material to be rolled, and then, based on the measurement data obtained by the dimension gauges provided on the entrance side and the exit side of the roller straightening machine, the optimal control value is obtained by the optimal control system. The guide setting value of the restraint guide device, the rolling reduction value of each mill, the roll thrust adjustment value, the short stroke adjustment value, and the And controls the thrust adjustment value and the roll width adjustment value width adjustment values and vertical straightening rolls over straightener roll gap set value and horizontal straightening rolls is characterized in that to correct the material to be rolled. In the present invention, the finished dimensions of the finished material are measured by a dimension meter provided on the output side of the finishing universal mill, and the measured data is used for each rolling mill, each edger mill, and the dimension meter on the entry side of the finishing universal mill. And the feed back to the restraining guide device, the measurement data from the dimension gauge on the entry side of the intermediate universal mill is fed back to the breakdown mill and coarse universal mill group, and the intermediate universal mill, intermediate edger mill, finish universal mill, and intermediate rolling mill group Feeds to the guide device of the finisher, and feeds the measurement data from the dimensioner on the entry side of the finish universal mill to the guide device for the finishing material.Based on the measurement data of these dimensioners, the optimal control system gives the optimal instruction. Judge the value,
Since the rolling reduction value of each mill, thrust adjustment value, short stroke adjustment value of the edger mill, and guide interval setting value of the guide roller device are controlled between passes or between bars, the dimensional accuracy is much better than the conventional method. Shaped steel can be rolled. Subsequently, the rolled material to be rolled is straightened by controlling the roller straightening machine by the optimum control system as described below. After finishing the rolling, the dimensions and shape of the finished material are measured with a dimension meter provided on the exit side of the finishing universal mill or on the entry side of the roller straightening machine, and the measurement data is sent to a constraint guide device provided on the exit side of the finishing universal mill. Feedback,
Guide setting values of the constraint guide device (guide path line,
Refers to width and height. same as below. ) By controlling
Controls how the next material comes out. Thereby, particularly, the occurrence of the bending of the end portion can be prevented. After finishing the rolling, measure the dimensions and shape of the finished material (the web height in this case) with the dimension meter on the exit side of the finishing universal mill.
The measured data is fed forward to the width adjustment mechanism of the horizontal straightening roll of the roller straightening machine, and the straightening is performed with the optimum inner method straightening dimension. Further, by controlling the width of the vertical straightening roll of the roller straightening machine, it is possible to manufacture a product having a small variation in web height. After finishing the rolling, the dimensions and shape of the finished material are measured with a dimension meter provided on the entrance or exit side of the roller straightener, and based on the measurement data, the roll gap adjustment, roll thrust adjustment, and roll width adjustment of the straightening roll By performing feedback or feed-forward for optimal size / shape control, a product excellent in size / shape can be manufactured. FIG. 1 is a block diagram showing an example of a control system used in the manufacturing method of the present invention. In the figure, BD is a breakdown mill, E1 is a rough edger mill, R1 is a rough universal mill, which constitutes a group of rough rolling mills for rolled materials. To roll. Reverse rolling is performed in the coarse edger mill E1 and the coarse universal mill R1. R2 and E2 are an intermediate universal mill and an intermediate edger mill which constitute an intermediate rolling mill group, respectively.
The rough-rolled material is further intermediate-rolled into an H-shaped cross section that is closer to the product shape. This intermediate universal mill R2
A guide device GR for guiding the material to be rolled is provided on the entry side of the intermediate mill R2.
1 is installed. This dimension gauge S1 is a finished dimension of the material to be rolled in the final pass of the coarse universal mill R1,
For example, the web height H, the flange width B, the web thickness t1, the flange thickness t2, and the web center deviation S shown in FIG. 9 are measured. In addition, intermediate universal mill R
2. Reverse rolling is also performed in the intermediate edger mill E2, and the guide device GR guides the flange or the web with a roller or a friction guide. F is a finishing universal mill, and a guide device GF having the same configuration as that of the above GR is provided on the entrance side thereof.
On the delivery side, a restraining guide device GFD for restraining and guiding the finishing material is installed. The constraint guide device GFD is also of a type in which a flange or a web is guided by a roller or a friction guide. The exit side of the intermediate edger mill E2 and the restraining guide device GF
A dimension gauge S2 and a dimension gauge S3 are installed on the exit side of D, respectively. The rolled material is finish-rolled to a target product size by the finish universal mill F. RS is a roller straightening machine connected to a rolling line composed of the above-mentioned respective mills and edger mills. On its inlet and outlet sides, a size / shape meter for measuring the size / shape of each part of the material to be straightened shown in FIG. K1 and a dimension / shape meter K2 are installed. P / C is a process computer for controlling the optimal size and shape. The measuring timings, measuring objects and control items of the dimension gauges S1, S2 and S3 are as shown in Table 1, and the dimension gauge S1 installed on the entrance side of the intermediate universal mill R2 has the measured values. , Breakdown Mill B
D and the coarse universal mill group, and the intermediate universal mill R2, the intermediate edger mill E
2. Feed forward to the guide device GR and finish universal mill F, respectively. The dimension meter S2 installed on the output side of the intermediate edger mill E2 feeds the measured value to the guide device GF on the input side of the finishing universal mill F. The dimension gauge S3 installed on the exit side of the restraining guide device GFD compares the measured value with all the rolling mills (BD, R1, R2, F) and the edger mill (E).
1, E2), and also to the dimension gauge S2. [Table 1] However, in Table 1, R1 finish: measured at the last pass of R1 mil R2 even pass: measured at the even pass of R2 mil R2 last pass: measured at the last pass of R2 mil F finish: F mill FB: Feedback control FF: Feed forward control FBBt1: Breakdown finished web thickness (final beam blank web thickness) B: Flange width (see FIG. 9) H: Web height (same as above) t1: Web Thickness (same as above) t2: Flange thickness (same as above) P / L: Pass line (same as above) Axis: Shift amount in the horizontal roll thrust direction of each universal mill S: Web center deviation (= | ab- / 2) The dimension / shape meter K1 on the entry side of the roller straightening machine RS measures the size / shape of the material to be straightened before the straightening and sends the measured data to the roller straightening machine RS. Feed forward and correct the gap setting value of the horizontal straightening roll 11, the width setting value of the horizontal straightening roll 11 and the vertical straightening roll 12, and the thrust adjustment value of the horizontal straightening roll 11, and feed it back to the constraint guide device GFD, Of the guide setting value of the constraint guide device GFD with respect to. The dimension / shape meter K2 on the output side of the roller straightening machine RS measures the dimension / shape of the material to be straightened after the straightening, and feeds back the measurement data to the roller straightening machine RS.
The gap set value of the horizontal straightening roll 11, the width set value of the horizontal straightening roll 11 and the vertical straightening roll 12, and the thrust adjustment value of the horizontal straightening roll 11 are corrected. In these control system systems, the priority is automatically determined from a plurality of instruction values, and an optimal instruction is performed. Next, specific examples of the present invention will be described. (Example 1) Size of H-section steel, H200 × B200
× 8/12, H500 × B200 × 10/16, H900 × B300 × 16/28
Regarding species, conventional method-1 (FIG. 10) and conventional method-2 (FIG. 1)
1) and manufactured by the method of the present invention (FIG. 2), and finished dimensions and shapes of products were compared. In the conventional method-1, the rolling material is manufactured in an arrangement of each rolling mill as shown in FIG. 10, and the finished material is subsequently corrected by the roller straightening machine RS. Only the dimension gauge S3 is installed, and the rolling set value of each mill roll and the guide device G are set based on the data measured by the dimension gauge S3.
R, GF, and each guide setting value of the constraint guide device GFD are manually corrected, and the dimensions and shape of the product after the correction are manually measured, and the horizontal correction of the roller straightening machine RS is performed manually based on the measurement data. The gap setting value of the roll and the width setting values of the horizontal straightening roll and the vertical straightening roll are corrected. The conventional method-2 is one in which the rolling materials are manufactured in an arrangement of each rolling mill as shown in FIG. 11 and the finished material is subsequently corrected by a roller straightening machine RS. Dimension gauge S on the exit side of universal mill F
3 and feeds the measurement data from the dimension gauge S2 to the guide device GF on the entry side of the finishing universal mill F to automatically change the guide setting. The rolling setting of each mill roll, the guide setting of the guide device GR other than the GF, and the change of the roll gap setting and the roll width setting of the roller straightening machine RS based on the measurement data of the dimension gauge S3 are performed manually as in the conventional method-1. It was assumed that. The method of Example 1 is one in which the rolling mill is manufactured in an arrangement of each rolling mill as shown in FIG. 2, and the finished material is subsequently corrected by a roller straightening machine RS. A dimension gauge S3 is installed on the exit side of the restraining guide device GFD of the finishing universal mill F, and a dimension / shape gauge K1 is installed on the entrance side of the roller straightening machine RS. From these dimension / shape gauges S2, S3, K1 Optimum size / shape control is performed by the process computer P / C based on the measured data. That is,
The measurement data of the dimension gauge S3 is taken into the dimension gauge S2 and learned, and the learned data is fed forward to the guide device GF on the entry side of the finishing universal mill F to complete the rolling. The measurement data of the dimension / shape meter K1 is learned, the learned optimal indication value is fed back to the constraint guide device GFD, the shape control of the next material is performed, and the measurement data of the dimension / shape meter K1 is transmitted to the roller straightening machine RS. The roll gap adjustment, the thrust adjustment, and the roll width adjustment of the roller straightener RS are performed based on the measurement data based on the feedback, and the size and shape of the material are controlled. The items measured by the dimension gauges S2 and S3 and the dimension / shape gauge K1 in the first embodiment are as follows. Dimension gauge S2: B, t1, S Dimension gauge S3: H, B, t1, t2, S, t2 Uneven thickness dimension / shape gauge K1: H, B, t2, t1, flange fall (flange warpage) Finished dimensions of product Table 2 shows the shape comparison results. [Table 2] As is clear from Table 2, the present invention is more susceptible to the conventional method-1 and the conventional method-2, in which the center of the web is deviated, the product is bent in the vertical and horizontal directions, the ends are bent, the flanges fall, and the like.
It can be seen that the improvement effect is remarkable in terms of the fluctuation of the web height. (Example 2) The same three sizes as those of Example 1 were produced by the method of the present invention, the conventional method-1 and the conventional method-2, and the finished dimensions and shapes of the products were compared. The conventional method-1 and the conventional method-2 are the same as the method of the first embodiment. The method of the second embodiment is such that the rolling material is manufactured in an arrangement of each rolling mill as shown in FIG. 1 and the finished material is subsequently corrected by a roller straightening machine RS.
1 The finished dimensions of the rough rolled material were measured, and based on the measured data, the rolling reduction of each roll of the finishing mill F to the finishing mill F, the thrust adjustment of the rolls, and the short stroke of the edger mill were automatically corrected. (The path schedule according to the preset model set in advance is automatically corrected). In addition, the automatic correction of the roll reduction setting of the intermediate universal mill R2 and the finishing universal mill F is performed on the front material (the material to be rolled immediately before the material).
Based on the measurement data of the dimension meter S3, priority is given to this data, and correction for reduction and adjustment for thrust are performed. Further, the measurement data of the dimension gauge S1 is fed forward to the guide setting of the guide device GR on the entry side of the intermediate universal mill R2, the measurement data of the dimension gauge S3 is taken into the dimension gauge S2, learned, and the learned data is finished. The feed is fed forward to the guide device GF on the entry side of the universal mill F to complete the rolling, and subsequently, the measurement data of the dimension gauge S3 and the measurement data of the dimension / shape gauge K1 are learned.
The learned optimum instruction value is fed back to the constraint guide device GFD to control the shape of the next material, and further, the measurement data of the dimension / shape meter K1 and the measurement data of the dimension / shape meter K2 are learned. The values are fed forward to the roller straightener RS, and based on the measurement data, the roll gap adjustment, thrust adjustment, and roll width adjustment of the roller straightener RS are performed to control the size and shape of the material. It is. The items measured by the dimension gauges S1, S2, S3 and the dimension / shape gauges K1, K2 in the second embodiment are as follows. Dimension gauge S1: B, t1, t2, S, t2 Uneven thickness gauge S2: B, t1, S Dimension gauge S3: H, B, t1, t2, S, t2 Uneven thickness dimension / shape gauge K1: H, B , T2, t1, flange fall (flange warpage) Dimension / shape meter K2: H, B, t2, t1, flange fall (flange warp) Table 3 shows comparison results of finished dimensions. [Table 3] As is evident from Table 3, the present invention is remarkably different from the conventional method-1 and the conventional method-2 in all respects of the web center deviation, the flange thickness deviation and the flange width difference. It can be seen that the product is excellent, and the bending of the product in the vertical and horizontal directions, the bending of the end portion, the falling of the flange, and the fluctuation of the web height are also superior to those of the first embodiment. As described above, according to the present invention, the dimensions of each part are measured by the dimension meter during each rolling process of the material to be rolled, and the optimum control is performed based on the measured data. The system controls the rolling reduction value of each mill, thrust adjustment value, short stroke adjustment value of the edger mill, and guide setting value of the guide device, so that the web center deviation, flange thickness deviation, flange width change It is possible to roll a section steel with extremely high overall dimensional accuracy including the above. In addition, the dimensions and shape of the finished material after the completion of rolling are measured by the dimension shape meters provided on the entrance and exit sides of the roller straightening machine, and based on these measurement data, the optimal control system is used to determine the finish universal mill exit side. While adjusting the guide setting value of the restraining guide device, the roll gap setting value of the roller straightening machine, the thrust adjustment value of the horizontal straightening roll, the roll width adjustment value, the width adjustment value of the vertical straightening roll are controlled, Manufactures shape steel that can realize roller straightening online and has remarkably excellent dimensions and shapes in all aspects of edge bending, longitudinal bending, flange fall, and web height fluctuation can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram showing an example of a control system used in the present invention. FIG. 2 is a configuration diagram showing another control system of the present invention. FIG. 3 is an explanatory view showing an example of a dimensional defect of an H-section steel. FIG. 4 is an explanatory view showing an example of a shape defect of an H-section steel. FIG. 5 is an explanatory diagram showing a change in a web height of an H-section steel. FIG. 6 is an explanatory diagram of a roller straightening machine. FIG. 7 is an explanatory diagram of a shaft adjustment / width adjustment mechanism of the roller straightening machine. FIGS. 8A and 8B are explanatory diagrams showing the arrangement of H-section steels on the cooling floor, wherein FIG. 8A is a plan view, FIG. 8B is a cross-sectional view taken along line AA, and FIG.
Is a cross-sectional view taken along line BB, and (d) is a cross-sectional view taken along line CC. FIG. 9 is an explanatory view showing dimensions of each part of the H-section steel. FIG. 10 is a configuration diagram of a first example of a conventional method for comparison. FIG. 11 is a configuration diagram of a second example of the conventional method for comparison. [Description of Signs] BD: Breakdown Mill E1: Coarse Edger Mill R1: Coarse Universal Mill R2: Intermediate Universal Mill E2: Intermediate Edger Mill F: Finishing Universal Mill RS: Roller Straighteners S1, S2, S3: Dimension Meters K1, K2: Dimension / shape meter P / C: Process computer

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI B21D 3/02 B21B 37/00 BBG (72) Inventor Kiyoo Omori 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Steel Pipe Co., Ltd. (72 Inventor Minoru Komatsubara 1-2-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References JP-A-6-15327 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) B21B 37/00-37/78 B21B 1/08 B21B 39/16 B21D 3/02

Claims (1)

(57) [Claims 1] Through a breakdown mill and a coarse universal mill, a rough rolling process using a coarse edger mill, an intermediate rolling process using an intermediate universal mill and an intermediate edger mill, and a finish rolling process using a finishing universal mill. In a method for producing a shaped steel in which a material to be rolled is rolled, and then the finished material is straightened by a roller straightening machine, the material to be rolled is guided to an entry side or an entry / exit side of the intermediate universal mill and an entry side of the finish universal mill, respectively. A guide device for guiding the rolled material while restraining the material to be rolled on the exit side of the finishing universal mill, and providing a dimension gauge for measuring the size and shape of the material to be rolled or the material to be straightened to the intermediate mill. The entrance or exit or both sides of the universal mill, the exit of the finished universal mill Side, provided on the entrance or exit side or both sides of the roller straightening machine, respectively, based on the measurement data by the dimension meter provided on the entrance side, exit side of the universal mill, determine the optimal indicated value by the optimal control system, Roll set value of each mill,
The horizontal roll thrust adjustment value, the short stroke adjustment value of the edger mill, and the guide setting value of the guide device are controlled between passes or between bars to roll the material to be rolled, and subsequently provided on the entrance side and the exit side of the roller straightening machine. Based on the measurement data obtained by the dimension meter, an optimal control value is determined by an optimal control system, and guide setting values of the restraining guide device, rolling reduction values of each mill, roll thrust adjustment values, short stroke adjustment values, and A method for manufacturing a shaped steel, comprising: controlling a roll gap setting value of a roller straightening machine, a thrust adjustment value of a horizontal straightening roll, a roll width adjustment value, and a width adjustment value of a vertical straightening roll to straighten a material to be rolled.