JPH0671321A - Coiling temperature controlling method for hot rolled steel sheet - Google Patents

Coiling temperature controlling method for hot rolled steel sheet

Info

Publication number
JPH0671321A
JPH0671321A JP4228847A JP22884792A JPH0671321A JP H0671321 A JPH0671321 A JP H0671321A JP 4228847 A JP4228847 A JP 4228847A JP 22884792 A JP22884792 A JP 22884792A JP H0671321 A JPH0671321 A JP H0671321A
Authority
JP
Japan
Prior art keywords
steel sheet
temperature
rolled steel
coiling temperature
tip
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.)
Withdrawn
Application number
JP4228847A
Other languages
Japanese (ja)
Inventor
Yoshiaki Kikawa
佳明 木川
Yoshio Oike
美雄 大池
Teruko Kawashima
輝子 川嶋
Hisakazu Inoue
尚和 井上
Yoshikazu Matsuura
義和 松浦
Hideki Urakawa
秀喜 浦川
Original Assignee
Kobe Steel Ltd
株式会社神戸製鋼所
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd, 株式会社神戸製鋼所 filed Critical Kobe Steel Ltd
Priority to JP4228847A priority Critical patent/JPH0671321A/en
Publication of JPH0671321A publication Critical patent/JPH0671321A/en
Withdrawn legal-status Critical Current

Links

Abstract

PURPOSE:To uniformize the mechanical characteristics all over the length by correcting the command target coiling temperature in a non-stationary part of a hot rolled steel sheet by adding the correcting amount of coiling temperature in a specific tip end part. CONSTITUTION:The coiling temperature of the hot rolled steel plate is controlled using plural water supplying banks arranged between a hot finishing mill and a coiling machine. The command target coiling temperature in the non-stationary part between the tip end part and a stationary part of the hot rolled steel sheet is corrected by adding the coiling temperature correcting amount of the tip end part found by a formular DELTACTx = (a(X)haim+b)X(1.0-c(X)x). In the formular, DELTATCx is the correcting amount of take-up temperature in the tip end part, haim is the target plate thickness, (x) is the distance from the tip end part to the normal part and (a), (b) and (c) are the constants for the strength of steel sheet, the coiling temperature and the plate thickness respectively. Thus, the precision of coiling temperature is improved all over the length.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明は、熱間仕上圧延後の熱延
鋼板の巻取り温度制御方法に関し、特に熱延鋼板全長に
わたり均一な機械的性質を得るための巻取り温度制御方
法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a winding temperature of a hot rolled steel sheet after hot finish rolling, and more particularly to a method for controlling a winding temperature for obtaining uniform mechanical properties over the entire length of the hot rolled steel sheet. Is.
【0002】[0002]
【従来の技術】熱間仕上圧延機により仕上圧延された高
温の熱延鋼板は巻取り機により巻取られて製品コイルと
なるが、その巻取りの際、要求される製品の機械的性質
を確保するため巻取り温度が定められている。この巻取
り温度を制御するために、冷却装置が熱間仕上圧延機と
巻取り機の間に設けられている。
2. Description of the Related Art A hot rolled hot rolled steel sheet finish-rolled by a hot finish rolling mill is wound up by a winding machine to form a product coil. At the time of winding, the required mechanical properties of the product are The winding temperature has been set to ensure this. To control the winding temperature, a cooling device is provided between the hot finish rolling mill and the winding machine.
【0003】図3は、熱延鋼板を所定の巻取り温度に制
御する巻取り温度制御設備の概念図である。図におい
て、1は熱間仕上最終圧延機(以下仕上圧延機と言
う)、2は巻取り機、3および4は仕上圧延機1と巻取
り機2の間のランアウトテーブルの上部および下部に設
置された冷却装置、5および6は仕上圧延機1の後面に
設置された仕上圧延出側温度計および板厚計、7は仕上
圧延機1の速度検出器、8は巻取り温度計、9はフィー
ドフォワード制御回路、10はフィードバック制御回路、
をそれぞれ示す。
FIG. 3 is a conceptual diagram of a winding temperature control facility for controlling the hot rolled steel sheet at a predetermined winding temperature. In the figure, 1 is a hot finishing final rolling mill (hereinafter referred to as a finishing rolling mill), 2 is a winding machine, and 3 and 4 are installed above and below a runout table between the finishing rolling machine 1 and the winding machine 2. The cooling devices 5 and 6 are the finishing rolling delivery side thermometer and the plate thickness gauge installed on the rear surface of the finishing rolling mill 1, 7 is the speed detector of the finishing rolling mill 1, 8 is the winding thermometer, and 9 is Feedforward control circuit, 10 is a feedback control circuit,
Are shown respectively.
【0004】冷却装置3および4は、各々1〜Nの注水
バンクに分割され、Nバンクは微調整用冷却バンクとし
て機能する。また、フィードフォワード制御回路9は、
仕上圧延出側温度計5、板厚計6および速度検出器7の
入力信号にもとづく演算結果を冷却装置3,4の1〜N
−1バンクに出力して熱延鋼板Sの冷却条件を制御する
機能を有する。また、フィードバック制御回路10は、巻
取り温度計8の入力信号にもとづく演算結果を冷却装置
3,4のNバンクに出力して熱延鋼板Sの冷却条件の微
調整制御を行う機能を有する。
The cooling devices 3 and 4 are each divided into 1 to N water injection banks, and the N banks function as fine adjustment cooling banks. Further, the feedforward control circuit 9 is
The calculation results based on the input signals of the finish rolling output side thermometer 5, the plate thickness gauge 6 and the speed detector 7 are 1 to N of the cooling devices 3 and 4.
-1 has a function of outputting to a bank and controlling the cooling condition of the hot rolled steel sheet S. Further, the feedback control circuit 10 has a function of outputting the calculation result based on the input signal of the winding thermometer 8 to the N banks of the cooling devices 3 and 4 to finely control the cooling conditions of the hot-rolled steel sheet S.
【0005】上記巻取り温度制御設備においては、熱間
仕上圧延された熱延鋼板Sは、フィードフォワード制御
回路9およびフィードバック制御回路10からの出力信号
により、仕上圧延機1と巻取り機2の間に設けられた冷
却装置3,4によって上部および下部から同時に注水さ
れて所定の温度にまで冷却され、巻取り機2に巻取られ
て製品コイルとなる。
In the winding temperature control facility, the hot-rolled hot-rolled steel sheet S is output from the feedforward control circuit 9 and the feedback control circuit 10 by the finish rolling machine 1 and the winding machine 2. Water is simultaneously poured from the upper part and the lower part by the cooling devices 3 and 4 provided therebetween to be cooled to a predetermined temperature, and the product coil is wound up by the winder 2.
【0006】[0006]
【発明が解決しようとする課題】上述の如き巻取り温度
制御がなされても、仕上圧延後の熱延鋼板Sは通常 800
℃以上の高温状態にあるため、外部からの力特に上部か
らの注水により変形しやすい。また、熱延鋼板Sの幅方
向の端部は中央部に比べて温度降下量が大きく、端部と
中央部とで収縮量が異なるため、熱延鋼板Sの形状が悪
化しやすい。
Even if the winding temperature control is performed as described above, the hot rolled steel sheet S after finish rolling is usually 800
Since it is in a high temperature state above ℃, it is easily deformed by external force, especially by pouring water from above. Further, the end portion in the width direction of the hot-rolled steel sheet S has a larger temperature drop amount than the central portion, and the shrinkage amount is different between the end portion and the central portion, so that the shape of the hot-rolled steel sheet S is likely to deteriorate.
【0007】このため、ランアウトテーブル上を熱延鋼
板Sが走行する時、仕上圧延機1と巻取り機2との間で
張力が作用する熱延鋼板Sの定常部では、高温状態で外
力が作用しても変形に対する抵抗が大きく、また幅方向
で温度降下量の差があっても張力により形状悪化が修正
されるが、熱延鋼板Sの先端から定常部に到る間の先端
部(以下非定常部と言うこともある)では、巻取り機2
にかみ込むまでは張力がかからないため、変形に対する
抵抗が小さく非定常部の形状は悪くなる。このように形
状が悪くなると、山の部分と谷の部分で冷却の差を生
じ、巻取り温度が変動し、熱延鋼板S全長にわたり均一
な機械的性質が得られなくなる。
For this reason, when the hot-rolled steel sheet S travels on the run-out table, in the steady portion of the hot-rolled steel sheet S where tension acts between the finish rolling mill 1 and the winding machine 2, external force is applied at high temperature. Even if it acts, resistance to deformation is large, and even if there is a difference in the amount of temperature drop in the width direction, the deterioration of the shape is corrected by the tension, but the tip portion (from the tip of the hot rolled steel sheet S to the steady portion ( In the following, it may be referred to as an unsteady part), and the winder 2
Since no tension is applied until it is bitten in, the resistance to deformation is small and the shape of the unsteady part becomes poor. When the shape is deteriorated in this way, a difference in cooling occurs between the peak portion and the valley portion, the winding temperature fluctuates, and uniform mechanical properties cannot be obtained over the entire length of the hot-rolled steel sheet S.
【0008】上記現象は、熱間における強度が低い鋼板
や、板厚が薄い鋼板ほど、変形に対する抵抗が小さいた
め現れやすい。また、目標の巻取り温度が低い鋼板で
は、注水量が多くなり、より大きな力が作用するため、
上記の現象が著しくなる傾向にある。
The above-mentioned phenomenon is more likely to appear in a steel plate having a low hot strength and a steel plate having a thin plate thickness because the resistance against deformation is small. Also, in the case of a steel plate with a low target coiling temperature, the amount of water injection increases and a greater force acts, so
The above phenomenon tends to be remarkable.
【0009】このような問題の防止方法として、前熱延
鋼板の先端部における巻取り温度の実績値と目標値との
差をもとに次熱延鋼板の先端部の目標温度を修正する方
法が、例えば特公平 4−8125号公報や特開平 3−198905
号公報に提案されている。しかし、一般に、熱延鋼板の
強度、巻取り温度および板厚により熱延鋼板の先端部の
温度変動が異なるため、前記方法では、前熱延鋼板の影
響が大きく、次鋼板で強度や板厚などが異なると、目標
温度を修正する際の誤差が大きくなる。
As a method of preventing such a problem, a method of correcting the target temperature of the tip of the next hot-rolled steel sheet based on the difference between the actual value and the target value of the winding temperature at the tip of the pre-hot-rolled steel sheet However, for example, Japanese Patent Publication No. 4-8125 and Japanese Patent Laid-Open No. 3-198905
It is proposed in Japanese Patent Publication No. However, in general, the strength of the hot-rolled steel sheet, the winding temperature and the temperature variation of the tip portion of the hot-rolled steel sheet differ depending on the plate thickness. If the difference is different, the error in correcting the target temperature becomes large.
【0010】本発明は、上記の事情にもとづいてなされ
たものであって、その目的は、前熱延鋼板の強度、巻取
り温度および板厚に影響されることなく、熱延鋼板の先
端部における巻取り温度の精度向上を図り、これによ
り、熱延鋼板全長にわたり均一な機械的性質を得るため
の巻取り温度制御方法を提供することである。
The present invention has been made based on the above circumstances, and its purpose is to be free from the influence of the strength, the coiling temperature and the thickness of the pre-hot-rolled steel sheet, and the tip of the hot-rolled steel sheet. It is an object of the present invention to provide a winding temperature control method for improving the accuracy of the winding temperature in, and thereby obtaining uniform mechanical properties over the entire length of the hot-rolled steel sheet.
【0011】[0011]
【課題を解決するための手段】上記の目的を達成するた
め、本発明に係わる熱延鋼板の巻取り温度制御方法は、
熱間仕上圧延機と巻取り機の間に配設された複数個の注
水バンクにより熱延鋼板の巻取り温度を制御するにあた
り、熱延鋼板の最先端部から定常部に到る間の非定常部
における指令目標巻取り温度を、下記式により求められ
る先端部の巻取り温度補正量を加算して補正するもので
ある。 ΔCTX =(a×haim +b)×( 1.0−c×x) ただし、ΔCTX :先端部の巻取り温度補正量 haim :目標板厚 x:最先端から定常部までの距離 a,b,c:鋼板の強度、目標巻取り温度および板厚に
よる定数をそれぞれ示す。
In order to achieve the above object, a method for controlling a coiling temperature of a hot rolled steel sheet according to the present invention comprises:
When controlling the winding temperature of the hot-rolled steel sheet by a plurality of water injection banks installed between the hot finish rolling mill and the winder, it is necessary to control The command target winding temperature in the steady portion is corrected by adding the winding temperature correction amount of the tip portion obtained by the following formula. ΔCT X = (a × h aim + b) × (1.0−c × x) where ΔCT X : correction amount of winding temperature at the tip portion h aim : target thickness x: distance from the leading edge to the steady portion a, b , C: the strength of the steel plate, the target winding temperature, and the constant depending on the plate thickness, respectively.
【0012】[0012]
【作用】鋼板の強度、巻取り温度および板厚などによ
り、熱延鋼板における先端の非定常部と定常部の巻取り
温度の差の大きさおよび先端からの長さは異なる。した
がって、本発明では、非定常部と定常部の巻取り温度の
差の大きさおよび先端からの長さを、鋼板の強度、巻取
り温度および板厚などの関数として算出し、これをもと
に制御上の目標温度を補正する。このことにより、先端
部の巻取り温度を定常部と同様に目標温度とすることが
できる。
FUNCTION The magnitude of the difference in the winding temperature between the unsteady portion and the steady portion of the hot rolled steel sheet and the length from the tip of the hot rolled steel sheet differ depending on the strength of the steel sheet, the winding temperature, the sheet thickness, and the like. Therefore, in the present invention, the magnitude of the difference in the coiling temperature between the unsteady part and the stationary part and the length from the tip are calculated as a function of the strength of the steel plate, the coiling temperature, the plate thickness, etc. Correct the control target temperature. As a result, the winding temperature of the tip portion can be set to the target temperature as in the stationary portion.
【0013】例えば、非定常部の巻取り温度が定常部に
比べて低く現れる場合には、指令された目標巻取り温度
より非定常部のみ制御上の目標温度を高めに設定する。
このことにより、非定常部の注水量は定常部に比べて少
なくなり、通常であれば低くなるところが指令された目
標温度とすることができる。
For example, when the winding temperature of the unsteady portion appears lower than that of the steady portion, the control target temperature of only the unsteady portion is set higher than the commanded target winding temperature.
As a result, the amount of water injected in the unsteady part is smaller than that in the steady part, and it is possible to set the commanded target temperature to be lower than usual.
【0014】[0014]
【実施例】以下、本発明の実施例を説明する。本発明方
法は、基本的には前記図3に示す如き巻取り温度制御設
備に適用される。
EXAMPLES Examples of the present invention will be described below. The method of the present invention is basically applied to the winding temperature control equipment as shown in FIG.
【0015】目標巻取り温度をパラメータとし、計算に
よる、最先端部と定常部の巻取り温度の差と板厚との関
係の一例を図1に示す。この例は、鋼板の強度が30キロ
のものに対するものであるが、各強度のものについてこ
の関係を求める。
FIG. 1 shows an example of the relationship between the plate thickness and the difference between the winding temperatures of the leading edge portion and the steady portion, calculated by using the target winding temperature as a parameter. In this example, the strength of the steel plate is 30 kg, but this relationship is obtained for each strength.
【0016】上記関係をもとに、非定常部と定常部との
巻取り温度の差を、鋼板の強度、巻取り温度および板厚
の関数とする。一実施例として、先端部の巻取り温度補
正量を、下記式にて求める。 ΔCTX =(a×haim +b)×( 1.0−c×x) ただし、ΔCTX :先端部の巻取り温度補正量 haim :目標板厚 x:最先端からの距離 a,b,c:鋼板の強度、目標巻取り温度および板厚に
よる定数をそれぞれ示す。この補正量から、鋼板全長の
制御上の目標巻取り温度を算出する。 CTX =CTa +ΔCTX ただし、CTX :制御上の目標巻取り温度 CTa :指令された目標巻取り温度を示す。
Based on the above relationship, the difference in the coiling temperature between the unsteady part and the stationary part is a function of the strength of the steel plate, the coiling temperature and the plate thickness. As an example, the winding temperature correction amount of the tip end portion is obtained by the following formula. ΔCT X = (a × h aim + b) × (1.0−c × x) where ΔCT X : correction amount of coiling temperature at the tip h aim : target thickness x: distance from the leading edge a, b, c: The strength of the steel plate, the target winding temperature, and the constant depending on the plate thickness are shown. From this correction amount, a target coiling temperature for controlling the total length of the steel plate is calculated. CT X = CT a + ΔCT X where CT X is the target winding temperature for control CT a is the commanded target winding temperature.
【0017】上述した最先端部と定常部の巻取り温度の
差と板厚との関係および先端部の巻取り温度補正量の算
出式は、フィードフォワード制御回路9に入力されて記
憶される。そして、冷却される鋼板の指令情報が与えら
れた時、前記記憶した算出式等に基づいて、先端部の補
正量を算出し、制御上の目標巻取り温度を決定するとと
もに、この制御上の温度になるように、注水量を計算
し、出力する。
The above-described relationship between the difference between the coiling temperature at the most distal end portion and the stationary portion and the plate thickness and the formula for calculating the coiling temperature correction amount at the tip portion are input to and stored in the feedforward control circuit 9. Then, when the command information of the steel plate to be cooled is given, the correction amount of the tip portion is calculated based on the stored calculation formula and the like, the target winding temperature for control is determined, and Calculate and output the amount of water injection so that the temperature is reached.
【0018】板厚が 3mm、板幅1235mmで、目標巻取り温
度が 500℃、強度30キロの鋼板において、従来の方法で
冷却した時の巻取り温度の実績と、本発明の方法で冷却
した時の巻取り温度の実績を図2に示す。破線は従来方
法によるもの、実線は本発明方法によるものである。
A steel plate having a plate thickness of 3 mm, a plate width of 1235 mm, a target coiling temperature of 500 ° C., and a strength of 30 kg was cooled by the conventional method and the coiling temperature of the present invention. Fig. 2 shows the actual winding temperature. The broken line is based on the conventional method, and the solid line is based on the method of the present invention.
【0019】従来の方法では、鋼板先端部で巻取り温度
が指令された目標温度から大きく外れているのに対し、
本発明の方法では鋼板先端部の温度精度は非常に良好な
ものとなっている。
In the conventional method, the coiling temperature at the tip of the steel plate largely deviates from the commanded target temperature.
In the method of the present invention, the temperature accuracy of the tip of the steel sheet is very good.
【0020】[0020]
【発明の効果】本発明によれば、鋼板全長にわたり、巻
取り温度精度の向上、および機械的性質の均一化が達成
でき、その経済的効果は大きい。
According to the present invention, the accuracy of the coiling temperature can be improved and the mechanical properties can be made uniform over the entire length of the steel sheet, and its economic effect is great.
【図面の簡単な説明】[Brief description of drawings]
【図1】目標巻取り温度をパラメータとし、計算によ
る、最先端部と定常部の巻取り温度の差と板厚との関係
を示す図である。
FIG. 1 is a diagram showing a relationship between a difference between a winding temperature of a leading end portion and a steady portion and a plate thickness, which is calculated by using a target winding temperature as a parameter.
【図2】従来方法で冷却した時の巻取り温度実績と本発
明方法で冷却した時の巻取り温度実績を示す図である。
FIG. 2 is a diagram showing the actual winding temperature when cooled by the conventional method and the actual winding temperature when cooled by the method of the present invention.
【図3】熱間仕上圧延機と巻取り機との間の冷却設備の
概要図である。
FIG. 3 is a schematic diagram of cooling equipment between a hot finish rolling mill and a winding machine.
【符号の説明】[Explanation of symbols]
1:熱間仕上圧延機 2:巻取り機 3:上部冷却装置 4:下部冷却装置 5:仕上圧延出側温度計 6:板厚計 7:速度検出器 8:巻取り温度計 9:フィードフォワード制御回路 10:フィードバッ
ク制御回路
1: Hot finishing rolling mill 2: Winding machine 3: Upper cooling device 4: Lower cooling device 5: Finishing rolling delivery side thermometer 6: Plate thickness gauge 7: Speed detector 8: Winding thermometer 9: Feedforward Control circuit 10: Feedback control circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 井上 尚和 兵庫県加古川市金沢町1番地 株式会社神 戸製鋼所加古川製鉄所内 (72)発明者 松浦 義和 兵庫県加古川市金沢町1番地 株式会社神 戸製鋼所加古川製鉄所内 (72)発明者 浦川 秀喜 兵庫県加古川市金沢町1番地 株式会社神 戸製鋼所加古川製鉄所内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Naokazu Inoue 1 Kanazawa-machi, Kakogawa-shi, Hyogo Kamido Steel Works Kakogawa Works (72) Inventor Yoshikazu Matsuura Kanazawa-cho, Kakogawa-shi, Hyogo Kamizawa Co., Ltd. Toko Works Kakogawa Works (72) Inventor Hideki Urakawa 1 Kanazawacho, Kakogawa City, Hyogo Prefecture Kadodo Works Kakogawa Works

Claims (1)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 熱間仕上圧延機と巻取り機の間に配設さ
    れた複数個の注水バンクにより熱延鋼板の巻取り温度を
    制御するにあたり、熱延鋼板の最先端部から定常部に到
    る間の非定常部における指令目標巻取り温度を、下記式
    により求められる先端部の巻取り温度補正量を加算して
    補正することを特徴とする熱延鋼板の巻取り温度制御方
    法。 ΔCTX =(a×haim +b)×( 1.0−c×x) ただし、ΔCTX :先端部の巻取り温度補正量 haim :目標板厚 x:最先端から定常部までの距離 a,b,c:鋼板の強度、目標巻取り温度および板厚に
    よる定数をそれぞれ示す。
    1. When controlling the winding temperature of a hot-rolled steel sheet by a plurality of water injection banks arranged between a hot finish rolling mill and a winder, the hot-rolled steel sheet is moved from the most tip portion to a steady portion. A method for controlling a coiling temperature of a hot-rolled steel sheet, comprising: correcting a command target coiling temperature in a non-steady part in the meantime by adding a coiling temperature correction amount of a tip end obtained by the following formula. ΔCT X = (a × h aim + b) × (1.0−c × x) where ΔCT X : correction amount of winding temperature at the tip portion h aim : target thickness x: distance from the leading edge to the steady portion a, b , C: the strength of the steel plate, the target winding temperature, and the constant depending on the plate thickness, respectively.
JP4228847A 1992-08-27 1992-08-27 Coiling temperature controlling method for hot rolled steel sheet Withdrawn JPH0671321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4228847A JPH0671321A (en) 1992-08-27 1992-08-27 Coiling temperature controlling method for hot rolled steel sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4228847A JPH0671321A (en) 1992-08-27 1992-08-27 Coiling temperature controlling method for hot rolled steel sheet

Publications (1)

Publication Number Publication Date
JPH0671321A true JPH0671321A (en) 1994-03-15

Family

ID=16882808

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4228847A Withdrawn JPH0671321A (en) 1992-08-27 1992-08-27 Coiling temperature controlling method for hot rolled steel sheet

Country Status (1)

Country Link
JP (1) JPH0671321A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008238272A (en) * 2007-02-28 2008-10-09 Jfe Steel Kk Hot-rolling line
CN102962296A (en) * 2012-11-14 2013-03-13 河北省首钢迁安钢铁有限责任公司 Low-temperature coiling method for thick X120 pipeline steel hot rolled coils
CN110624953A (en) * 2019-09-30 2019-12-31 攀钢集团西昌钢钒有限公司 Method and device for processing X80 strip steel

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008238272A (en) * 2007-02-28 2008-10-09 Jfe Steel Kk Hot-rolling line
CN102962296A (en) * 2012-11-14 2013-03-13 河北省首钢迁安钢铁有限责任公司 Low-temperature coiling method for thick X120 pipeline steel hot rolled coils
CN110624953A (en) * 2019-09-30 2019-12-31 攀钢集团西昌钢钒有限公司 Method and device for processing X80 strip steel

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