JPH0716686B2 - Heating method for joining billets - Google Patents
Heating method for joining billetsInfo
- Publication number
- JPH0716686B2 JPH0716686B2 JP20399990A JP20399990A JPH0716686B2 JP H0716686 B2 JPH0716686 B2 JP H0716686B2 JP 20399990 A JP20399990 A JP 20399990A JP 20399990 A JP20399990 A JP 20399990A JP H0716686 B2 JPH0716686 B2 JP H0716686B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- heating
- steel
- joining
- time
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Induction Heating (AREA)
- Metal Rolling (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、鋼片接合時における加熱方法に関し、とく
に誘導加熱方式を用いた短時間の急速加熱において、目
標温度までの精度良い加熱を可能ならしめようとするも
のである。Description: TECHNICAL FIELD The present invention relates to a heating method for joining steel slabs, and in particular, enables rapid heating up to a target temperature in rapid heating for a short time using an induction heating method. It is what you try to do.
（従来の技術） 従来、鋼片の熱間圧延に際しては、加熱炉から抽出した
鋼片を一本づつ圧延していたが、かような方法では、 ａ）鋼片先端の噛み込み不良、 ｂ）鋼片後端の絞り込み、 ｃ）鋼片先端のランナウトテーブル上での走行トラブ
ル、 ｄ）鋼片先後端の寸法不良、 など種々の問題が生じていたことから、最近では熱間仕
上げ圧延機の入側搬送ラインにおいて、先行する鋼片の
後端部と後行する鋼片の先端部とを順次接合してから仕
上げ圧延に供する連続圧延方法が採用されつつある。(Prior Art) Conventionally, when hot rolling a steel slab, the steel slabs extracted from the heating furnace were rolled one by one, but with such a method, a) defective biting of the tip of the steel slab, b ) Narrowing of the rear end of the steel slab, c) Trouble running on the runout table at the front end of the slab, d) Dimensional defects at the front and rear ends of the slab, and so on. A continuous rolling method in which the trailing end portion of the preceding steel piece and the leading end portion of the following steel piece are sequentially joined to each other and then subjected to finish rolling is being adopted in the entry side conveyance line.
それに伴い鋼片の接合方法についても種々の方法が開発
され、その中でも比較的短時間で接合を終了できる方法
として、例えば特開昭60−244401号公報に開示の誘導加
熱圧接法が報告されている。この方法は、第６図に示す
ように加熱手段としてソレノイド型コイルｓを用い、先
行鋼片1-aの後端部と後行鋼片1-bの先端部との接合部を
急速加熱したのち、両端部を押圧することによって、先
行、後行両鋼片を接合するものである。Along with it, various methods have been developed for the method of joining steel pieces, and among them, as a method capable of completing the joining in a relatively short time, for example, the induction heating pressure welding method disclosed in JP-A-60-244401 has been reported. There is. In this method, as shown in FIG. 6, a solenoid type coil s is used as a heating means, and the joint between the trailing end of the preceding steel piece 1-a and the leading end of the following steel piece 1-b is rapidly heated. After that, both the leading and trailing steel pieces are joined by pressing both ends.
（発明が解決しようとする課題） 鋼片の接合に際しては、接合部を、1250℃から融点直下
の接合可能温度範囲まで加熱する必要があるが、接合温
度は上限近傍の高温域に設定することが有利である。と
いうのは高温になるほど鋼片は軟化するので、押圧によ
る接合が容易になるからである。とはいえ加熱温度が融
点以上になると、第７図に示すように、接合部の一部が
融け落ちて接合部に隙間ができ、板幅方向に均一な接合
力、ひいては良好な接合面が得られないので、加熱温度
は鋼片の融点を超えないようにすることが肝要である。(Problems to be solved by the invention) When joining steel slabs, it is necessary to heat the joint to a temperature range from 1250 ° C to just below the melting point, but the joining temperature should be set to a high temperature range near the upper limit. Is advantageous. This is because the higher the temperature, the softer the steel slab, and the easier the joining by pressing. However, when the heating temperature becomes higher than the melting point, as shown in FIG. 7, a part of the joint part melts down to form a gap in the joint part, a uniform joint force in the plate width direction, and a good joint surface. Since it cannot be obtained, it is important that the heating temperature does not exceed the melting point of the steel slab.
しかしながら上記した誘導加熱方式により、目標温度を
融点直下に設定して加熱を行う場合、温度計による測定
値が目標温度になった時点で加熱を停止したのでは、制
御系の遅れにより、加熱温度が融点を超えることがあ
る。すなわち誘導加熱方式は、急速加熱であるがゆえ
に、制御系のわずかなタイムラグによっても、オーバー
ヒートを生じるおそれが大きかったのである。However, when the target temperature is set just below the melting point by the above-mentioned induction heating method and heating is performed, if the heating is stopped when the measured value by the thermometer reaches the target temperature, the heating temperature may be delayed due to the delay in the control system. May exceed the melting point. That is, since the induction heating method is rapid heating, there is a high possibility that overheating may occur even with a slight time lag in the control system.
この発明は、上記の問題を有利に解決するもので、誘導
加熱方式による急速加熱に際しても、目標温度まで的確
に昇温できる加熱方法を提案することを目的とする。The present invention advantageously solves the above problems, and an object of the present invention is to propose a heating method capable of accurately increasing the temperature to a target temperature even during rapid heating by an induction heating method.
（課題を解決するための手段） この発明は、熱間仕上げ圧延機の入側において、先行す
る鋼片の後端部と後行する鋼片の先端部とを突き合わ
せ、ついで誘導加熱方式にて加熱、押圧して両者を接合
する方法おいて、 上記突き合わせ部を目標温度まで加熱するに際し、 鋼片の初期温度と昇温速度から目標温度までの昇温カー
ブを予測し、かつ制御系の遅れによるタイムラグを加味
して、目標温度に到達するまでの時間を算出し、得られ
た値に基づいて加熱処理を施すことからなる鋼片接合時
における加熱方法である。(Means for Solving the Problems) The present invention, on the inlet side of a hot finish rolling mill, abuts the trailing end portion of the preceding steel piece and the leading end portion of the following steel piece, and then uses an induction heating method. In the method of joining both by heating and pressing, when heating the butt section to the target temperature, predict the temperature rise curve from the initial temperature of the steel slab and the heating rate to the target temperature, and delay the control system. Is a heating method at the time of joining steel slabs, in which the time required to reach the target temperature is calculated by taking into account the time lag due to, and the heat treatment is performed based on the obtained value.
以下、この発明を具体的に説明する。The present invention will be specifically described below.
第１図に、この発明の実施に用いて好適な接合装置を組
み込んだ仕上げ圧延機の入側搬送ラインを模式で示す。FIG. 1 schematically shows an inlet side conveyance line of a finish rolling mill incorporating a joining device suitable for carrying out the present invention.
図中番号1-a,1-bはそれぞれ先行鋼片および後行鋼片、
２はコイルボックス、3-a,3-bおよび3-cはピンチロー
ル、４はレベラー、５は切断装置、そして６が接合装置
である。同図には接合装置６として、加熱、接合処理を
鋼片１の走行と同期させるいゆる走間で行う場合につい
て例示したが、これに対してかかる接合装置６を停止し
た状態で加熱、接合処理を行う場合には、破線７で示し
たルーパを利用することになる。また８はFSB（デスケ
ーラ）、９は仕上げ圧延機の第１スタンドである。Numbers 1-a and 1-b in the figure are the leading and trailing billets, respectively.
2 is a coil box, 3-a, 3-b and 3-c are pinch rolls, 4 is a leveler, 5 is a cutting device, and 6 is a joining device. In the figure, the joining device 6 is illustrated as a case where the heating and joining processes are performed between the runs in which the running of the steel slab 1 is synchronized. However, the joining device 6 is heated and joined in a stopped state. When performing the processing, the looper shown by the broken line 7 is used. Further, 8 is an FSB (descaler), and 9 is the first stand of the finish rolling mill.
この発明において、誘導加熱方式としては前掲第６図に
示したようなソレノイド方式だけでなく、第２図に示す
ように、交番磁界を鋼片の板厚方向に貫通させて印加す
るいわゆるトランスバース方式であっても良い。In the present invention, the induction heating method is not limited to the solenoid method as shown in FIG. 6 above, but as shown in FIG. 2, a so-called transverse method in which an alternating magnetic field is applied by penetrating in the plate thickness direction of the steel slab. It may be a method.
ここに第２図に示したようなトランスバース方式によっ
て先行、後行鋼片の突き合わせ部ａの中央域に交番磁界
ｄを印加した場合、突き合わせ部ａには、第３図に示す
ような渦電流ｅが誘発されて、突き合わせ接触領域が優
先的に加熱されることになる。図中、番号10が鋼片１の
板厚方向に貫通させて交番磁界を発生させる交番磁界発
生コイルであり、かかる交番磁界発生コイル10は、鋼片
を上下に挟んで設置した一対のコア10-aとこれらのコア
に連続して巻き回したコイル10-bと電源10-cとからな
る。When an alternating magnetic field d is applied to the central area of the abutting portion a of the leading and trailing steel pieces by the transverse method as shown in FIG. 2, a vortex as shown in FIG. An electric current e will be induced, which will preferentially heat the butt contact area. In the figure, reference numeral 10 is an alternating magnetic field generating coil for penetrating in the plate thickness direction of the steel piece 1 to generate an alternating magnetic field. The alternating magnetic field generating coil 10 is a pair of cores 10 with the steel piece sandwiched vertically. -a, a coil 10-b continuously wound around these cores, and a power supply 10-c.
さてこの発明ではまず、切断装置によって先行する鋼片
の後端部と後行する鋼片の先端部とを切断する。In the present invention, first, the cutting device cuts the trailing end portion of the preceding steel piece and the trailing end portion of the following steel piece.
ついで両端部を突き合わせたのち、加熱、押圧処理を施
すわけであるが、かかる処理に際し、誘導加熱方式を採
用した場合には急速加熱であるがゆえに、制御系のわず
かなタイムラグによっても、オーバーヒートという不都
合が生じていたのである。Then, after abutting the both ends, heating and pressing are performed, but in such processing, if the induction heating method is adopted, since it is rapid heating, there is a slight time lag in the control system, which causes overheating. There was an inconvenience.
そこでこの発明では、鋼片の初期温度と昇温速度とから
目標温度までの昇温カーブを予測し、この予測カーブか
ら目標温度到達までの時間を算出し、この算出結果に基
づいて加熱を施すのである。Therefore, in the present invention, the temperature rising curve from the initial temperature and the temperature rising rate of the billet to the target temperature is predicted, the time until the target temperature is reached is calculated from this prediction curve, and heating is performed based on this calculation result. Of.
（作用） ここに昇温カーブの予測は、たとえば次のようにして行
う。(Operation) Here, the temperature rise curve is predicted as follows, for example.
第４図に示すように、目標温度をθＦ（℃）、初期温度
をθ１（℃）とし、加熱開始からt1（ｓ）後の板温をθ
２（℃）、さらにt2（ｓ）後の板温をθ３（℃）とする
と、加熱開始から（t1＋t2）経過後、目標温度までの到
達時間ｔは次式、 で表されることになる。As shown in FIG. 4, the target temperature is θ F (° C.), the initial temperature is θ 1 (° C.), and the plate temperature after t 1 (s) from the start of heating is θ.
Assuming that the plate temperature after 2 (° C.) and t 2 (s) is θ 3 (° C.), after reaching (t 1 + t 2 ) from the start of heating, the arrival time t to the target temperature is Will be represented by
ただし、A,Bは次式により表わされる。However, A and B are expressed by the following equations.
しかしながら上記のｔ秒後に加熱を停止すると、やはり
制御系のタイムラグにより、オーバーヒートするおそれ
がある。 However, if the heating is stopped after t seconds, the control system time lag may cause overheating.
そこでこの発明では、かかるタイムラグを加味し、タイ
ムラグがtLであるとすれば（ｔ−tL）後に加熱を停止す
るものであり、かくして目標温度まで的確に昇温するこ
とができるのである。Therefore, in the present invention, if such a time lag is taken into consideration and the time lag is t L , the heating is stopped after (t−t L ), and thus the temperature can be accurately raised to the target temperature.
以上、加熱後の測温データから昇温カーブを推定した場
合について説明したが、次に述べるプリセット方式によ
れば、とくに上記のような測温を行わなくても、目標温
度到達時間を検出することができる。The case where the temperature rise curve is estimated from the temperature measurement data after heating has been described above. However, according to the preset method described below, the target temperature arrival time is detected without performing the temperature measurement as described above. be able to.
すなわち、 印加電力:W（ｗ） 鋼片の比熱:C（J/K・ｇ） 鋼片の密度：ρ（g/cm3） 鋼片の厚み:D（mm） とし、また 鋼片の初期温度：θ１（℃） 加熱後の目標温度：θＦ（℃） とすれば、目標温度までの到達時間ｔは、次式 ここでa1，a2は定数 で表されるのである。That is, applied power: W (w) Specific heat of billet: C (J / K · g) Density of billet: ρ (g / cm 3 ) Thickness of billet: D (mm), and initial of billet Temperature: θ 1 (° C.) If the target temperature after heating is θ F (° C.), the arrival time t to reach the target temperature is Here, a 1 and a 2 are expressed by constants.
なおこのプリセット方式においても、タイムラグを加味
する必要があるのはいうまでもない。Needless to say, it is necessary to add a time lag also in this preset method.
このプリセット方式によれば、温度測定は初期温度だけ
でよく、加熱開始後にとくに測温する必要がないという
利点がある。According to this preset method, the temperature can be measured only at the initial temperature, and there is an advantage that it is not necessary to measure the temperature after the start of heating.
なお加熱、押圧処理としては、 ｉ）接合予定部の温度が目標温度に達した時点で加熱を
停止し、ついで押圧する方法、 ii）接合予定部の温度が接合可能温度に達したならば、
加熱は継続したまま（ただし鋼片の溶融温度は超えな
い）で、押圧を開始する方法、 iii）最初から鋼片同士を押圧し、接触部の加熱も同時
に行う方法 など種々の方法が考えられるが、この発明ではいずれの
方法でも良く、とくにiii）の方法は有効である。とい
うのは熱間仕上げ圧延の前段階では、鋼片はまだ1000〜
1100℃程度の高温状態にあるので、単なる押圧だけでも
各鋼片の接合は幾分かは進行するところ、かかる押圧処
理を行いつつ加熱を施してやればその接合が効果的に促
進され、接合時間の短縮および加熱に要する投入電力量
の削減が期待できるからである。As the heating and pressing treatment, i) a method of stopping heating when the temperature of the planned joining portion reaches the target temperature and then pressing, ii) if the temperature of the planned joining portion reaches the possible joining temperature,
Various methods are conceivable, such as a method of starting pressing while continuing heating (but not exceeding the melting temperature of the steel pieces), iii) pressing the steel pieces from the beginning and simultaneously heating the contact parts. However, any method may be used in the present invention, and the method iii) is particularly effective. Because, before the hot finish rolling, the billets are still 1000 ~
Since it is at a high temperature of about 1100 ° C, the joining of the steel pieces will proceed to some extent by just pressing, but if heating is performed while performing such pressing treatment, the joining will be effectively promoted and the joining time This is because it can be expected to reduce the amount of electric power required for heating and heating.
なお上記の押圧処理は、鋼片端部の突き合わせ部を前後
に挟んで設けたピンチロールで容易に実施することがで
き、ここに押圧力は３〜5kg/mm2程度で充分である。The above-mentioned pressing process can be easily carried out with pinch rolls provided by sandwiching the abutting parts of the steel piece front and back, and a pressing force of about 3 to 5 kg / mm 2 is sufficient.
（実施例） 実施例１ 前掲第１図に示した接合装置を用い、次の要領で鋼片の
接合を行った。(Example) Example 1 Using the joining apparatus shown in FIG. 1 above, the steel pieces were joined in the following manner.
実験に用いた鋼片は、先行鋼片1-aおよび後行鋼片1-bと
も、厚み:30mm,幅:1000mmの低炭素鋼シートバーであ
る。The steel pieces used in the experiment are low carbon steel sheet bars having a thickness of 30 mm and a width of 1000 mm for both the preceding steel piece 1-a and the following steel piece 1-b.
さて先行シートバー1-aの後端部および後行シートバー1
-bの先端部を、ドラムシャー５によって切断し、両端部
を突き合わせたのち、第６図に示したソレノイド型誘導
コイルによって加熱を開始した。このときの加熱条件は
次のとおりであり、加熱時間の推定は前掲第４図に示し
た方式に従って行った。Now, the trailing edge of the leading seat bar 1-a and the trailing seat bar 1
The tip end of -b was cut by the drum shear 5, both ends were abutted, and then heating was started by the solenoid type induction coil shown in FIG. The heating conditions at this time are as follows, and the heating time was estimated according to the method shown in FIG.
・投入電力:2000kw ・目標温度θＦ:1300℃ ・１回目の測温時間：t1:0.5s ・２回目の測温時間t2:1s この時 ・初期温度θ１:1000℃ ・t1経過後の板温θ２:1040℃ ・t2経過後の板温θ３:1120℃ であった。・ Power input: 2000kw ・ Target temperature θ F : 1300 ℃ ・ First temperature measurement time: t 1 : 0.5s ・ Second temperature measurement time t 2 : 1s At this time ・ Initial temperature θ 1 : 1000 ℃ ・ t 1 The plate temperature after the lapse of temperature was θ 2 : 1040 ° C. and the plate temperature after the lapse of t 2 was θ 3 : 1120 ° C.
従って、前述の（２）（３）式から、A,Bはそれぞれ Ａ＝26.2 Ｂ＝−1020 となり、従って（１）式より ｔ＝2.2 となる。Therefore, from the above equations (2) and (3), A and B are respectively A = 26.2 B = -1020, and therefore from equation (1) t = 2.2.
なお制御系に特有のタイムラグtL:0.5s ∴（ｔ−tL）＝1.7s 従って２回目の測温時点から1.7s後に通電をカットし
た。Incidentally, the time lag peculiar to the control system t L : 0.5 s ∴ (t−t L ) = 1.7 s Therefore, the energization was cut off 1.7 s after the second temperature measurement.
その結果、ｔ秒後に板温は1290℃となり、ほぼ目標どお
りの温度に加熱できた。As a result, the plate temperature became 1290 ° C. after t seconds, and it was possible to heat the temperature to almost the target.
（発明の効果） かくしてこの発明によれば、鋼片の加熱方法として、急
速加熱である誘導加熱方式を利用した場合であっても、
目標温度まで的確に昇温することができ、オーバーヒー
トが発生するおそれはない。(Effect of the Invention) Thus, according to the present invention, even when the induction heating method that is rapid heating is used as the method for heating the steel slab,
The temperature can be accurately raised to the target temperature, and there is no risk of overheating.
第１図は、この発明の実施に用いて好適な加熱、接合装
置を組み込んだ仕上げ圧延機の入側搬送ラインの模式
図、 第２図は、トランスバース方式の誘導加熱装置の模式
図、 第３図は、トランスバース方式によって誘発された渦電
流の流れを示した図、 第４図は、測温データによる昇温カーブ予測要領の説明
図、 第５図は、プリセット方式による昇温カーブ予測要領の
説明図、 第６図は、ソレノイド方式の誘導加熱装置の模式図、 第７図は、オーバーヒートによって接合面の一部が融け
落ちた状態を示した図である。 1-a…先行鋼片、1-b…後行鋼片 ２…コイルボックス 3-a,3-b,3-c…ピンチロール ４…レベラー、５…切断装置 ６…接合装置、７…ルーパ ８…FSB、９…第１スタンド 10…交番磁界発生コイル 10-a…コア、10-b…コイル 10-c…電源FIG. 1 is a schematic diagram of an inlet side transfer line of a finish rolling mill incorporating a heating and joining device suitable for carrying out the present invention, and FIG. 2 is a schematic diagram of a transverse induction heating device. Fig. 3 is a diagram showing the flow of eddy currents induced by the transverse method, Fig. 4 is an explanatory diagram of the procedure for predicting the temperature rise curve based on the temperature measurement data, and Fig. 5 is prediction of the temperature rise curve by the preset method. FIG. 6 is a schematic diagram of a solenoid type induction heating device, and FIG. 7 is a diagram showing a state in which a part of the joint surface is melted down due to overheating. 1-a ... Leading billet, 1-b ... Trailing billet 2 ... Coil box 3-a, 3-b, 3-c ... Pinch roll 4 ... Leveler, 5 ... Cutting device 6 ... Joining device, 7 ... Looper 8 ... FSB, 9 ... First stand 10 ... Alternating magnetic field generating coil 10-a ... Core, 10-b ... Coil 10-c ... Power supply
───────────────────────────────────────────────────── フロントページの続き (72)発明者 武智 敏貞 千葉県千葉市川崎町１番地 川崎製鉄株式 会社千葉製鉄所内 (72)発明者 青木 富士男 千葉県千葉市川崎町１番地 川崎製鉄株式 会社千葉製鉄所内 (56)参考文献 特開 昭63−90302（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Toshisada Takechi 1 Kawasaki-cho, Chiba-shi, Chiba Inside Kawasaki Steel Co., Ltd. (72) Inventor Fujio Fujio 1 Kawasaki-cho, Chiba-shi Kawasaki Steel Co., Ltd. Chiba Inside a steel mill (56) References JP-A-63-90302 (JP, A)
Claims (1)
る鋼片の後端部と後行する鋼片の先端部とを突き合わ
せ、ついで誘導加熱方式にて加熱、押圧して両者を接合
する方法おいて、 上記突き合わせ部を目標温度まで加熱するに際し、 鋼片の初期温度と昇温速度から目標温度までの昇温カー
ブを予測し、かつ制御系の遅れによるタイムラグを加味
して、目標温度に到達するまでの時間を算出し、得られ
た値に基づいて加熱処理を施すことを特徴とする鋼片接
合時における加熱方法。1. At the entrance side of a hot finish rolling mill, the trailing end of a preceding steel slab and the leading end of a following steel stake are butted against each other and then heated and pressed by an induction heating system to join the two. In this method, when heating the butt section to the target temperature, predict the temperature rising curve from the initial temperature of the steel slab and the temperature rising rate to the target temperature, and add the time lag due to the delay of the control system to obtain the target. A heating method at the time of joining steel bills, characterized in that the time required to reach the temperature is calculated, and heat treatment is performed based on the obtained value.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20399990A JPH0716686B2 (en) | 1990-08-02 | 1990-08-02 | Heating method for joining billets |
| US07/844,670 US5323951A (en) | 1990-08-02 | 1991-08-01 | Method of joining steel sheet bars in hot rolling and a continuous hot rolling method |
| PCT/JP1991/001031 WO1992002315A1 (en) | 1990-08-02 | 1991-08-01 | Method of joining billets during hot rolling and method of continuous hot rolling |
| EP91913663A EP0495989B1 (en) | 1990-08-02 | 1991-08-01 | Method of joining billets during hot rolling and method of continuous hot rolling |
| CA002067772A CA2067772C (en) | 1990-08-02 | 1991-08-01 | Method of joining steel sheet bars in hot rolling and a continuous hot rolling method |
| DE69114467T DE69114467T2 (en) | 1990-08-02 | 1991-08-01 | METHOD FOR CONNECTING STICKS IN HOT ROLLING AND METHOD FOR CONTINUOUS HOT ROLLING. |
| CN91108654A CN1037587C (en) | 1990-08-02 | 1991-08-01 | Connecting process and continuous hot-rolling process for billet in hot-rolling |
| KR92700794A KR960012859B1 (en) | 1990-08-02 | 1992-04-02 | Method of joining billets during hot rolling and method of continuous hot rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20399990A JPH0716686B2 (en) | 1990-08-02 | 1990-08-02 | Heating method for joining billets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0489114A JPH0489114A (en) | 1992-03-23 |
| JPH0716686B2 true JPH0716686B2 (en) | 1995-03-01 |
Family
ID=16483101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20399990A Expired - Fee Related JPH0716686B2 (en) | 1990-08-02 | 1990-08-02 | Heating method for joining billets |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0716686B2 (en) |
-
1990
- 1990-08-02 JP JP20399990A patent/JPH0716686B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0489114A (en) | 1992-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2180914C (en) | Method and apparatus for continuous finishing hot-rolling a steel strip | |
| WO1992002315A1 (en) | Method of joining billets during hot rolling and method of continuous hot rolling | |
| JPH0716686B2 (en) | Heating method for joining billets | |
| JP2905377B2 (en) | Method of joining billets in hot rolling | |
| JP4081910B2 (en) | Steel slab joining method in continuous hot rolling | |
| JP2905347B2 (en) | Method of joining billets in hot rolling | |
| JP3054293B2 (en) | Method of joining billets in continuous hot rolling | |
| JP3283388B2 (en) | How to join billets | |
| JP2938689B2 (en) | Method of joining billets in hot rolling | |
| JPH0716687B2 (en) | Joining method of billets in hot rolling | |
| JP2975147B2 (en) | Method of joining billets in hot rolling | |
| JP3328503B2 (en) | Joining method of materials to be rolled in continuous hot rolling | |
| JPH08141602A (en) | Method for joining slab in hot rolling | |
| JP3126875B2 (en) | Continuous hot rolling of billets | |
| JP2000271605A (en) | Method for joining steel slabs in continuous hot-rolling | |
| JPH0824932A (en) | Continuous hot rolling method of slab | |
| JP3020635B2 (en) | Method of joining billets in hot rolling | |
| AU710706B2 (en) | Method and apparatus for continuous finishing hot-rolling a steel strip | |
| JPH0716684B2 (en) | Continuous rolling method for billet | |
| JPH0489109A (en) | Method for joining billets in hot rolling | |
| JP3901436B2 (en) | Hot rolling method | |
| JP3126745B2 (en) | Method of joining billets in hot rolling | |
| JP2905392B2 (en) | How to join billets | |
| JPH0330473B2 (en) | ||
| JPH0471601B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |