JP2604518B2 - Steel plate straightening method - Google Patents
Steel plate straightening methodInfo
- Publication number
- JP2604518B2 JP2604518B2 JP4169516A JP16951692A JP2604518B2 JP 2604518 B2 JP2604518 B2 JP 2604518B2 JP 4169516 A JP4169516 A JP 4169516A JP 16951692 A JP16951692 A JP 16951692A JP 2604518 B2 JP2604518 B2 JP 2604518B2
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- cooling
- steel sheet
- thick steel
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Metal Rolling (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、厚鋼板の矯正方法に関
するものであって、特に熱間矯正後の再矯正の発生を抑
制することを目的とする。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for straightening a thick steel plate, and more particularly, to suppressing occurrence of re-straightening after hot straightening.
【０００２】[0002]
【従来の技術】図４は、従来技術による厚鋼板の圧延後
のフロー図である。図４の（ａ）は、図１に示す圧延機
１で圧延する前の厚鋼板の図である。図４の（ｂ）は、
圧延後の厚鋼板の図である。圧延においてプレートクラ
ウンのクラウン変化率により鋼板センターとエッジの伸
び差が発生し、耳波や中波などの形状不良が発生する。
また、上下ロールの周速差や上下面の厚鋼板の温度差に
より、反り及び全面的な波が発生する。2. Description of the Related Art FIG. 4 is a flow chart after rolling a thick steel plate according to the prior art. FIG. 4A is a diagram of a thick steel plate before rolling by the rolling mill 1 shown in FIG. (B) of FIG.
It is a figure of the thick steel plate after rolling. During rolling, a difference in elongation between the center of the steel plate and the edge occurs due to the crown change rate of the plate crown, and shape defects such as ear waves and medium waves occur.
Also, warpage and overall waves occur due to a difference in peripheral speed between the upper and lower rolls and a temperature difference between the thick steel plates on the upper and lower surfaces.
【０００３】図４の（ｃ）は、図１の熱間矯正機３で千
鳥配置したロールにより、繰り返し曲げ応力を加え、厚
鋼板の平坦度をフラットにした図である。図４の（ｄ）
は、熱間矯正後冷却床にて空冷した後の厚鋼板の図であ
る。熱間矯正機で矯正した時に鋼板のエッジが鋼板内部
より温度が低いため、空冷後鋼板の残留応力は鋼板エッ
ジ部で圧縮応力となり、耳波が発生しやすく形状不良が
発生する。FIG. 4C is a view in which the flatness of the thick steel plate is made flat by repeatedly applying bending stress by rolls arranged in a staggered manner by the hot straightening machine 3 of FIG. FIG. 4D
FIG. 4 is a view of a steel plate after air cooling on a cooling floor after hot correction. Since the edge of the steel sheet has a lower temperature than the inside of the steel sheet when straightened by the hot straightening machine, the residual stress of the steel sheet after air cooling becomes a compressive stress at the steel sheet edge, and an ear wave is easily generated, resulting in a defective shape.
【０００４】[0004]
【発明が解決しようとする課題】図４の従来法では、上
述のように鋼板エッジ部が鋼板内部より温度が低くエッ
ジ部の残留応力が圧縮応力となり、特に板厚６mm以下の
厚鋼板は耳波となり、再矯正発生率が８６．３％となっ
ていた（図３参照）。本発明は、このような従来技術の
課題を有利に解決するものであって、特に熱間矯正後の
再矯正の発生を可及的に抑制することができる厚鋼板の
矯正方法を提供することを目的とする。In the conventional method shown in FIG. 4, the temperature at the edge of the steel sheet is lower than that inside the steel sheet as described above, and the residual stress at the edge becomes a compressive stress. Waves were generated, and the recorrection incidence rate was 86.3% (see FIG. 3). The present invention advantageously solves such problems of the prior art, and in particular, provides a method of straightening a thick steel plate that can minimize the occurrence of re-straightening after hot straightening. With the goal.
【０００５】[0005]
【課題を解決するための手段】この目的達成のための本
発明の矯正方法は、厚鋼板を仕上圧延後、熱間矯正機で
矯正する方法において、熱間矯正機後方に冷却設備を設
け、冷却設備では、厚鋼板端部は空冷、厚鋼板中央部は
冷却水量０．１ｍ3 ／ｍ2 ・分〜０．４ｍ3 ／ｍ2 ・分
の弱冷却を施て、厚鋼板端部の温度を厚鋼板中央部に対
し１０℃〜３０℃高くすることを特徴とする。The straightening method of the present invention for achieving this object is a method of finishing a thick steel plate and rolling it, and then straightening it with a hot straightening machine, wherein cooling equipment is provided behind the hot straightening machine, the cooling facility, steel plate end air cooling, the steel plate center part is Te facilities weak cooling of the cooling water 0.1m 3 / m 2 · min ~0.4m 3 / m 2 · min, the temperature of the steel plate end To the center of the thick steel plate
Then, the temperature is raised by 10 ° C. to 30 ° C.
【０００６】以下図面に基づいて本発明を説明する。図
１は、本発明の実施例を示す図である。圧延機１は仕上
圧延機であり、板厚４．５〜２００mmの製品板厚まで圧
延する厚鋼板用の圧延機である。搬送ロール２は、圧延
機１で圧延した厚鋼板を搬送するロールである。熱間矯
正機３は、圧延後の厚鋼板に発生した耳波、中波、反り
などの形状不良を、千鳥配置したロールにより繰り返し
曲げ応力を加えて厚鋼板を平坦にする設備である。次の
搬送ロール４は、前記搬送ロール２と同じものである。
冷却設備５は、一般的に、高張力で高靭性な鋼板を製造
する時に加速冷却を施し、厚鋼板の組織を制御する目的
で使用するが、厚鋼板の４０ｋクラスの一般材には冷却
機能を使用せずに搬送ロールとしての機能のみ用いる。
搬送ロール６は、前記の搬送ロール２、搬送ロール４と
同じものである。The present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. The rolling mill 1 is a finish rolling mill, and is a rolling mill for a thick steel plate that rolls to a product thickness of 4.5 to 200 mm. The transport roll 2 is a roll that transports the thick steel plate rolled by the rolling mill 1. The hot straightening machine 3 is a facility for flattening a thick steel plate by repeatedly applying bending stress to a shape defect such as an ear wave, a medium wave, and a warp generated in a thick steel plate after rolling by a staggered roll. The next transport roll 4 is the same as the transport roll 2 described above.
The cooling equipment 5 is generally used for the purpose of controlling the structure of a thick steel plate by performing accelerated cooling when manufacturing a high tensile strength and high toughness steel plate. Is used, and only the function as a transport roll is used.
The transport roll 6 is the same as the transport roll 2 and the transport roll 4 described above.
【０００７】図２は、本発明による厚鋼板の圧延後のフ
ロー図である。図２の（ａ）は、図１に示す圧延機１で
圧延する前の厚鋼板の図である。図２の（ｂ）は、図４
の（ｂ）と同様に圧延後の厚鋼板の形状を示す図であ
る。図２の（ｃ）は、図４の（ｃ）と同様に熱間矯正を
行った後、鋼板エッジ部を除いて鋼板内部のみ（斜線で
示す）冷却を施した図である。冷却条件としては、水量
を０．１ｍ3 ／ｍ2 ・分〜０．４ｍ3 ／ｍ2 ・分で、鋼
板エッジ部を除いた鋼板中央部のみ加速冷却を施し、鋼
板エッジ部の温度を鋼板センター部より１０℃〜３０℃
高くすることが好ましい。図２の（ｄ）は、エッジ部の
温度が高い厚鋼板を空冷した図である。熱間矯正後鋼板
エッジ部の温度を鋼板内部の温度より高くすることによ
り、空冷後の残留応力は鋼板エッジ部で引張応力とな
り、耳波の発生を抑えフラットな厚鋼板となる。FIG. 2 is a flow chart after rolling a thick steel plate according to the present invention. FIG. 2A is a view of a thick steel plate before rolling by the rolling mill 1 shown in FIG. FIG. 2 (b) shows FIG.
It is a figure which shows the shape of the thick steel plate after rolling similarly to (b) of FIG. FIG. 2C is a view in which after performing the hot straightening in the same manner as FIG. 4C, only the inside of the steel sheet (shown by oblique lines) is cooled except the steel sheet edge portion. The cooling conditions, the amount of water in 0.1m 3 / m 2 · min ~0.4m 3 / m 2 · min, subjected to accelerated cooling only steel central portion excluding the steel sheet edge portions, the steel sheet temperature of the steel sheet edge portions 10 ° C to 30 ° C from center
Preferably, it is higher. FIG. 2D is a diagram in which a thick steel plate having a high edge portion temperature is air-cooled. By making the temperature of the steel sheet edge after the hot straightening higher than the temperature inside the steel sheet, the residual stress after air cooling becomes a tensile stress at the steel sheet edge, thereby suppressing the generation of ear waves and forming a flat thick steel sheet.
【０００８】本発明の適用は、厚板４０ｋ、５０ｋクラ
スの圧延ままの一般材であり、制御冷却不適用鋼種であ
る。また板厚は６mm以下の残留応力による形状不良の発
生率が高い厚鋼板に適用する。冷却水量は、制御冷却
（加速冷却）の場合は最低でも０．５ｍ3 ／ｍ2 ・分以
上であるが、本発明は鋼板エッジ部の温度を鋼板内部よ
り高くし冷却後の残留応力を圧縮応力から引張応力にか
えることを目的とするため、０．１〜０．４ｍ3 ／ｍ2
・分の範囲がよい。[0008] The present invention is applied to as-rolled general materials of thick plates 40k and 50k class, and is a steel type to which controlled cooling is not applied. In addition, the present invention is applied to a thick steel plate having a high incidence of shape defects due to residual stress of 6 mm or less. In the case of controlled cooling (accelerated cooling), the amount of cooling water is at least 0.5 m 3 / m 2 · min or more. However, in the present invention, the temperature of the steel sheet edge is made higher than the inside of the steel sheet to compress the residual stress after cooling. 0.1-0.4 m 3 / m 2 for the purpose of changing from stress to tensile stress
・ The range of minutes is good.
【０００９】冷却水量が０．１ｍ3 ／ｍ2 ・分未満の場
合、鋼板中央部の温度をエッジ部の温度より低くするの
に多大な時間を要するため効率的ではない。また０．４
ｍ3／ｍ2 ・分超の場合は、鋼板の冷速が大きくなり、
鋼板の組織が圧延のままとは異なるようになり、引張強
さなど材質に影響を与えるようになるため適用できな
い。If the amount of cooling water is less than 0.1 m 3 / m 2 · min, it takes a lot of time to lower the temperature of the central part of the steel sheet from the temperature of the edge part, so that it is not efficient. Also 0.4
In the case of more than m 3 / m 2 · minute, the cooling speed of the steel sheet increases,
It is not applicable because the structure of the steel sheet is different from that of the as-rolled one, which affects the material such as tensile strength.
【００１０】[0010]
【実施例】図３の本発明では、厚鋼板（材質４０ｋ、５
０ｋの圧延まま、厚み４．５mm〜６．０mm、巾１０００
mm〜４５００mm）で、鋼板エッジ部が鋼板内部より温度
が高くエッジ部の残留応力が引張応力となり、鋼板の四
周部が拘束され耳波は発生せずフラットな鋼板となり、
再矯正発生率は４１．０％に低減され、従来法に比し格
段に優れていることが認められた。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention shown in FIG.
As rolled 0k, thickness 4.5mm-6.0mm, width 1000
mm ~ 4500mm), the temperature of the steel plate edge is higher than the inside of the steel plate, the residual stress at the edge becomes tensile stress, the four peripheral portions of the steel plate are restrained, and the plate becomes flat without ear waves,
The recorrection occurrence rate was reduced to 41.0%, and it was recognized that the rate was much superior to the conventional method.
【００１１】[0011]
【発明の効果】以上説明した本発明方法によれば、熱間
矯正後の厚鋼板の再矯正発生率が従来法に比較し著しく
低減されたため、形状不良の少ない高品質の厚鋼板を製
造することが可能となった。According to the method of the present invention described above, the rate of occurrence of re-correction of a thick steel sheet after hot straightening is significantly reduced as compared with the conventional method, so that a high-quality thick steel sheet with less shape defects can be manufactured. It became possible.
【図１】本発明方法を実施するための厚鋼板の矯正ライ
ン構成例を示す。FIG. 1 shows an example of a straightening line configuration of a thick steel plate for implementing the method of the present invention.
【図２】本発明方法による圧延後の厚鋼板の形状フロー
図。FIG. 2 is a shape flow chart of a thick steel plate after rolling by the method of the present invention.
【図３】本発明と従来法の再矯正発生率の比較図表。FIG. 3 is a comparison chart of the incidence of re-correction between the present invention and the conventional method.
【図４】従来方法による圧延後の厚鋼板の形状フロー
図。FIG. 4 is a shape flow chart of a thick steel plate after rolling by a conventional method.
１ 圧延機 ２、４、６ 搬送ロール ３ 熱間矯正機 ５ 冷却設備 DESCRIPTION OF SYMBOLS 1 Rolling machine 2, 4, 6 Transport roll 3 Hot straightening machine 5 Cooling equipment
フロントページの続き (56)参考文献 特開 昭62−187519（ＪＰ，Ａ) 特開 平４−66271（ＪＰ，Ａ) 特開 昭61−238413（ＪＰ，Ａ) 特開 昭58−90313（ＪＰ，Ａ) 特開 昭62−263816（ＪＰ，Ａ) 実開 昭62−10907（ＪＰ，Ｕ)Continuation of the front page (56) References JP-A-62-187519 (JP, A) JP-A-4-66271 (JP, A) JP-A-61-238413 (JP, A) JP-A-58-90313 (JP, A) JP-A-62-263816 (JP, A) JP-A-62-190716 (JP, U)
Claims (1)
する方法において、熱間矯正機後方に冷却設備を設け、
冷却設備では、厚鋼板端部は空冷、厚鋼板中央部は冷却
水量０．１ｍ3 ／ｍ2 ・分〜０．４ｍ3 ／ｍ2 ・分の弱
冷却を施して、厚鋼板端部の温度を厚鋼板中央部に対し
１０℃〜３０℃高くすることを特徴とする厚鋼板の矯正
方法。Claims: 1. A method for finishing a thick steel plate and rolling it by a hot straightening machine, wherein a cooling facility is provided behind the hot straightening machine,
The cooling facility, steel plate end air cooling, the steel plate center part is subjected to a weak cooling of the cooling water 0.1m 3 / m 2 · min ~0.4m 3 / m 2 · min, the temperature of the steel plate end To the center of the steel plate
A method for correcting a thick steel plate, wherein the temperature is increased by 10 ° C to 30 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4169516A JP2604518B2 (en) | 1992-06-26 | 1992-06-26 | Steel plate straightening method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4169516A JP2604518B2 (en) | 1992-06-26 | 1992-06-26 | Steel plate straightening method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH067847A JPH067847A (en) | 1994-01-18 |
| JP2604518B2 true JP2604518B2 (en) | 1997-04-30 |
Family
ID=15887961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4169516A Expired - Lifetime JP2604518B2 (en) | 1992-06-26 | 1992-06-26 | Steel plate straightening method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2604518B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5151693B2 (en) * | 2008-05-29 | 2013-02-27 | 新日鐵住金株式会社 | Manufacturing method of high-strength steel |
| CN110548776A (en) * | 2019-08-08 | 2019-12-10 | 太原理工大学 | Method for preparing aluminum-magnesium-aluminum three-layer metal composite plate by prefabricating cross corrugated interface |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5890313A (en) * | 1981-11-20 | 1983-05-30 | Nippon Steel Corp | Cooling device for steel plate |
| JPS61238413A (en) * | 1985-04-16 | 1986-10-23 | Nippon Steel Corp | Uniform cooling method for thickness-controlled rolling material |
| JPS6210907U (en) * | 1985-07-03 | 1987-01-23 | ||
| JPS62187519A (en) * | 1986-02-12 | 1987-08-15 | Sumitomo Metal Ind Ltd | Control method for bending on hot leveler |
| JPS62263816A (en) * | 1986-05-12 | 1987-11-16 | Kobe Steel Ltd | Water amount determining method for high temperature steel plank cooling |
| JPH0466271A (en) * | 1990-07-04 | 1992-03-02 | Sumitomo Metal Ind Ltd | Method for restraining camber in stripe cutting on wide and thick steel plate |
-
1992
- 1992-06-26 JP JP4169516A patent/JP2604518B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH067847A (en) | 1994-01-18 |
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