JP2992188B2 - How to join billets - Google Patents
How to join billetsInfo
- Publication number
- JP2992188B2 JP2992188B2 JP5328733A JP32873393A JP2992188B2 JP 2992188 B2 JP2992188 B2 JP 2992188B2 JP 5328733 A JP5328733 A JP 5328733A JP 32873393 A JP32873393 A JP 32873393A JP 2992188 B2 JP2992188 B2 JP 2992188B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- steel
- joining
- slab
- heating
- 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.)
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- Pressure Welding/Diffusion-Bonding (AREA)
- Metal Rolling (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、熱間圧延ラインにお
ける鋼片の接合方法に関し、とくに圧延鋼片の鋼種の如
何を問わず、仕上げ圧延時に接合部の分離・破断等を生
じることのない良好な鋼片接合を実現しようとするもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining billets in a hot rolling line, and in particular, does not cause separation or breakage of joints at the time of finish rolling, regardless of the type of rolled billet. It is intended to realize good billet joining.
【０００２】[0002]
【従来の技術】鋼片の熱間接合方法として、圧延ライン
において、先行する鋼片の後端部と後行する鋼片の先端
部を突き合わせ、その上下に配置した少なくとも１対の
誘導コイルにより鋼片上に誘導電流を生じさせ、この誘
導電流による抵抗発熱により加熱しつつ押圧することに
よって先行鋼片と後行鋼片をオンラインで接合する方法
が知られている。（例えば特開昭62−234679号公報）。2. Description of the Related Art As a method for hot joining of billets, a rear end of a preceding billet and a leading end of a succeeding billet are abutted on a rolling line, and at least one pair of induction coils arranged above and below the billet. 2. Description of the Related Art A method is known in which an induced current is generated on a steel slab, and a preceding steel slab and a following steel slab are joined on-line by heating and pressing while being heated by resistance heat generated by the induced current. (For example, JP-A-62-234679).
【０００３】上記の技術は、２枚の鋼片の突き合わせ面
を、小ギャップを隔ててほぼ平行に対向させ、この突き
合わせ部を上下に挟んで対設した１対のコイル導体に電
流を流し、鋼片を垂直に貫通する誘導磁場によって鋼片
上に誘導電流を生じさせることにより、鋼片端部を加熱
しつつ突き合わせ面同士を押圧することによって、両鋼
片を接合するものであり、ここに、好適な突き合わせ面
の温度は1350〜1400℃程度とされている。[0003] In the above-mentioned technique, abutting surfaces of two steel slabs are opposed almost in parallel with a small gap therebetween, and an electric current is applied to a pair of coil conductors which are opposed to each other with the abutting portion sandwiched vertically. By generating an induced current on the slab by an induced magnetic field that penetrates the slab vertically, the slabs are joined by pressing the butted surfaces while heating the ends of the slab. The preferable temperature of the butted surface is about 1350 to 1400 ° C.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記し
たように1350〜1400℃程度の加熱温度で接合した鋼片
を、後続の複数スタンドからなる仕上げ圧延機により、
圧下比が10倍程度以上の圧延を行った場合、全ての鋼種
ついて、圧延終了まで接合部の破断を招くことなしに圧
延を完了することはできなかった。具体的な例を挙げる
と、特に SS400や炭素含有量が100ppm以下の極低炭素鋼
においてトラブルが多発したのである。However, as described above, a steel slab joined at a heating temperature of about 1350 to 1400 ° C. is processed by a finishing rolling mill comprising a plurality of subsequent stands.
When rolling was performed with a reduction ratio of about 10 times or more, rolling could not be completed for all steel types without breaking the joint until the end of rolling. As a specific example, troubles occurred frequently especially in SS400 and ultra-low carbon steel with a carbon content of 100 ppm or less.
【０００５】この発明は、上記の問題を有利に解決する
もので、鋼種の如何を問わず、その後の仕上げ圧延にお
いて板破断等のトラブルが発生することのない、有利な
加熱条件を与えることにより、良好な接合を実現できる
鋼片の接合方法を提案することを目的とする。The present invention advantageously solves the above-mentioned problems, and provides advantageous heating conditions that do not cause troubles such as plate breakage in the subsequent finish rolling regardless of the type of steel. It is an object of the present invention to propose a method of joining steel slabs that can realize good joining.
【０００６】[0006]
【課題を解決するための手段】すなわちこの発明は、熱
間圧延ラインにおいて、先行する鋼片の後端部と後行す
る鋼片の先端部を加熱・押圧することによって、両鋼片
を接合するに際し、少なくとも接合該当部位の温度Ｔ
（℃）が、次式 Ｔ2 ≦Ｔ≦（Ｔ2 + Ｔ3 ）／２ ここで、Ｔ2 : 鋼片の固相線温度（℃） Ｔ3 : 鋼片の液相線温度（℃） を満足する温度条件下に押圧することを特徴とする鋼片
の接合方法（第１発明）である。That is, according to the present invention, in a hot rolling line, a rear end of a preceding steel slab and a front end of a succeeding steel slab are heated and pressed to join the two slabs. In doing so, at least the temperature T
(° C.) is the following equation: T 2 ≦ T ≦ (T 2 + T 3 ) / 2 where T 2 : solidus temperature of steel slab (° C.) T 3 : liquidus temperature of steel slab (° C.) The present invention is a method for joining steel slabs (first invention), characterized by pressing under a temperature condition satisfying the following.
【０００７】またこの発明は、熱間圧延ラインにおい
て、先行する鋼片の後端部と後行する鋼片の先端部を加
熱・押圧することによって、両鋼片を接合するに際し、
少なくとも接合該当部位の温度Ｔ（℃）が、下記 (1)式
又は (2)式を満足する温度条件下に押圧することを特徴
とする鋼片の接合方法（第２発明）である。 記 (1) Ｔ1 ≦Ｔ2 の場合 （Ｔ1 + Ｔ2 ）／２≦Ｔ≦（Ｔ2 + Ｔ3 ）／２ ---(1) (2) Ｔ1 ＞Ｔ2 の場合 Ｔ2 ≦Ｔ≦（Ｔ2 + Ｔ3 ）／２ ---(2) ここで、Ｔ1 : 酸化鉄スケールの溶融温度（℃） Ｔ2 : 鋼片の固相線温度（℃） Ｔ3 : 鋼片の液相線温度（℃）[0007] The present invention also provides a method for joining two steel slabs by heating and pressing a rear end of a preceding steel slab and a front end of a subsequent steel slab in a hot rolling line.
A method for joining steel slabs (second invention), characterized in that pressing is performed at least at a temperature T (° C.) at a portion corresponding to the joining satisfying the following expression (1) or (2). (1) When T 1 ≦ T 2 (T 1 + T 2 ) / 2 ≦ T ≦ (T 2 + T 3 ) / 2 --- (1) (2) When T 1 > T 2 T 2 ≦ T ≦ (T 2 + T 3 ) / 2 --- (2) where T 1 : melting temperature of iron oxide scale (° C.) T 2 : solidus temperature of steel slab (° C.) T 3 : steel Liquidus temperature of piece (℃)
【０００８】[0008]
【作用】以下、この発明を具体的に説明する。さて、良
好な鋼片接合を実現するには、接合に際し、接合対象部
位を、表面の酸化スケールが溶融除去できる温度まで昇
温するか、又は接合対象部位の少なくとも突き合わせ端
面を母材溶融状態とする必要があり、これらいずれかが
成り立つことが条件である。そこで、発明者らは、炭素
含有量が1.3 wt％〜５ppm の各種炭素鋼について、接合
後圧下率が５倍以上の圧延に耐え得る接合条件とくに好
適加熱温度範囲について調査を行った。なお接合の良否
は、接合後の仕上げ圧延における板破断の有無及び圧延
後の接合状態で判断した。この良否判断において、何ら
の問題なしに仕上げ圧延を実施できた場合は言うまでも
なく、圧延後に一部接合切れが生じた場合も実際上問題
がないので、良好な接合ということができる。The present invention will be specifically described below. By the way, in order to realize good steel billet joining, at the time of joining, the joining target site is heated to a temperature at which the oxide scale on the surface can be melted or removed, or at least the butt end face of the joining target site is brought into a base metal molten state. And it is a condition that either of these conditions is satisfied. Then, the present inventors investigated about the joining conditions which can endure the rolling whose reduction ratio after joining is 5 times or more, especially the suitable heating temperature range about various carbon steels whose carbon content is 1.3 wt%-5 ppm. In addition, the quality of joining was judged based on the presence or absence of sheet breakage in finish rolling after joining and the joining state after rolling. In this quality judgment, it goes without saying that the finish rolling can be carried out without any problem, and even if a partial break occurs after the rolling, there is practically no problem.
【０００９】得られた結果を、図１に示す。同図に示し
たとおり、好適加熱温度範囲は、炭素含有量に応じて大
きく変化し、炭素含有量が少ない場合は従来良好とされ
た1350〜1400℃よりもはるかに高温側であり、一方炭素
含有量が多い場合はより低温側であることが判明した。The results obtained are shown in FIG. As shown in the figure, the preferable heating temperature range greatly changes according to the carbon content, and when the carbon content is small, the heating temperature range is much higher than the conventionally good 1350 to 1400 ° C. It was found that the higher the content, the lower the temperature.
【００１０】ここに、上記の好適加熱温度範囲は、酸化
鉄スケールの溶融温度、鋼片の固相線温度及び鋼片の液
相線温度をパラメータとして利用すると良好に表現し得
ることが判明した。図２に、鋼片の炭素含有量と鋼片の
液相線温度及び固相線温度との関係を示す（同図は、鉄
鋼便覧第３版Ｉ基礎編（丸善株式会社）205 頁に示され
る算出式を用いて描図したものである）。また同図に
は、酸化スケールの溶融温度及び図１で求めた圧延状況
も併せて示す。It has been found that the preferred heating temperature range can be well expressed by using the melting temperature of the iron oxide scale, the solidus temperature of the slab, and the liquidus temperature of the slab as parameters. . FIG. 2 shows the relationship between the carbon content of the slab and the liquidus and solidus temperatures of the slab (the figure is shown on page 205 of the Iron and Steel Handbook, 3rd Edition, I Basic Edition (Maruzen Co., Ltd.)). It is drawn using the calculation formula shown below.) The figure also shows the melting temperature of the oxide scale and the rolling state obtained in FIG.
【００１１】図１及び図２を比較すると明らかなよう
に、炭素含有量に応じた最適加熱温度範囲は、鋼片の固
相線温度（Ｔ2 ）及び鋼片の液相線温度（Ｔ3 ）をパラ
メータとして好適に表現することができ、接合該当部位
の温度（Ｔ）が、次式 Ｔ2 ≦Ｔ≦（Ｔ2 + Ｔ3 ）／２ ここで、Ｔ2 : 鋼片の固相線温度（℃） Ｔ3 : 鋼片の液相線温度（℃） の範囲を満足すれば、何ら問題なしに仕上げ圧延を実施
することができた。As is apparent from a comparison between FIGS. 1 and 2, the optimum heating temperature range according to the carbon content is determined by the solidus temperature (T 2 ) of the slab and the liquidus temperature (T 3 ) of the slab. ) Can be suitably expressed as a parameter, and the temperature (T) of the portion corresponding to the joining is expressed by the following equation: T 2 ≦ T ≦ (T 2 + T 3 ) / 2 where T 2 : solid line of the billet Temperature (° C.) T 3 : If the liquidus temperature (° C.) of the billet was satisfied, the finish rolling could be performed without any problem.
【００１２】上記の温度範囲は、何ら問題のない最適加
熱温度範囲であるが、実際上問題のない好適加熱温度範
囲は、次のように表すことができる。すなわち、好適加
熱温度範囲は、上記した鋼片の固相線温度（Ｔ2 ）及び
液相線温度（Ｔ3 ）並びに酸化鉄スケールの溶融温度
（Ｔ1 ）をパラメータとして的確に表現することがで
き、鋼片の固相線温度（Ｔ2 ）が酸化鉄スケールの溶融
温度（Ｔ1 ）以上の場合は、接合該当部位の温度（Ｔ）
が酸化鉄スケールの溶融温度（Ｔ1 ）と鋼片の固相線温
度（Ｔ2 ）との中間温度よりも高く、かつ鋼片の固相線
温度（Ｔ2 ）と液相線温度（Ｔ3 ）との中間温度よりも
低い範囲、すなわち次式(1) （Ｔ1 + Ｔ2 ）／２≦Ｔ≦（Ｔ2 + Ｔ3 ）／２ ---(1) で示される範囲、一方、鋼片の固相線温度（Ｔ2 ）が酸
化鉄スケールの溶融温度（Ｔ1 ）を下回る場合は、合該
当部位の温度（Ｔ）が鋼片の固相線温度（Ｔ2 ）よりも
高く、かつ鋼片の固相線温度（Ｔ2 ）と液相線温度（Ｔ
3 ）との中間温度よりも低い範囲、すなわち次式(2) Ｔ2 ≦Ｔ≦（Ｔ2 + Ｔ3 ）／２ ---(2) で示される範囲が好適加熱温度範囲であることが究明さ
れたのである。The above-mentioned temperature range is an optimum heating temperature range without any problem, but a preferable heating temperature range without any practical problem can be expressed as follows. That is, the preferable heating temperature range can be accurately expressed using the above-described solidus temperature (T 2 ) and liquidus temperature (T 3 ) of the slab and the melting temperature (T 1 ) of the iron oxide scale as parameters. If the solidus temperature (T 2 ) of the billet is equal to or higher than the melting temperature (T 1 ) of the iron oxide scale, the temperature (T)
Is higher than the intermediate temperature between the melting temperature (T 1 ) of the iron oxide scale and the solidus temperature (T 2 ) of the slab, and the solidus temperature (T 2 ) and liquidus temperature (T 3 ), ie, a range represented by the following equation (1) (T 1 + T 2 ) / 2 ≦ T ≦ (T 2 + T 3 ) / 2 --- (1) When the solidus temperature (T 2 ) of the slab is lower than the melting temperature (T 1 ) of the iron oxide scale, the temperature (T) of the corresponding portion is higher than the solidus temperature (T 2 ) of the slab. High and the solidus temperature (T 2 ) and liquidus temperature (T
3 ) The range of lower than the intermediate temperature, that is, the range expressed by the following formula (2) T 2 ≦ T ≦ (T 2 + T 3 ) / 2 --- (2) may be a preferable heating temperature range. It was determined.
【００１３】なお、Ｔ2 ，Ｔ3 は鋼種成分に応じて、若
干変化するけれども、いずれの鋼種においても、上記し
た温度条件を満足すれば、良好な接合が実現されること
が確かめられている。[0013] Incidentally, T 2, T 3, depending on the type of steel components, but varies slightly, in any of steel types, to satisfy the temperature conditions described above, it has been confirmed that good bonding is achieved .
【００１４】[0014]
【実施例】熱間圧延ラインの粗ミル出側と仕上ミル入側
との間に、誘導電流発熱を利用した接合機を設置し、こ
の接合機の前段でクロップシャーにて先行鋼片の後端部
と後行鋼片の先端部とを所望の端部形状に切断したの
ち、誘導電流にて種々の温度に加熱後、押圧接合し、つ
いで仕上げミルに供した。昇熱速度は予め 100℃／ｓと
なるように設定すると共に、接合機に供する粗圧延後の
シートバーの加熱直前温度も、加熱炉抽出温度、粗圧延
速度により調整し、1000℃±20℃となるようにした。[Embodiment] A joining machine utilizing induced current heat is installed between a rough mill exit side and a finishing mill entrance side of a hot rolling line. After cutting the end portion and the leading end portion of the succeeding steel slab into a desired end shape, the end portion was heated to various temperatures by an induced current, pressed, and then subjected to a finishing mill. The heating rate is set so as to be 100 ° C / s in advance, and the temperature just before heating the sheet bar after the rough rolling to be applied to the joining machine is also adjusted by the heating furnace extraction temperature and the rough rolling speed, and is 1000 ° C ± 20 ° C. It was made to become.
【００１５】実施例１ 鋼種は、炭素含有量が 20ppm〜1.3 wt％の炭素鋼を用い
た。圧延条件は、粗圧延後のシートバー幅：700 〜1900
mm、シートバー厚：25〜50mm、また７段目仕上げミル出
側鋼板厚：0.8 〜3.5 mmとした。交番磁場印加のための
コイルとして、一対の鉄心コイルを鋼片接合部の上下に
接合幅全体に磁場が作用するように配置した。上下コイ
ルには同一交流電源から電力を供給するものとし、投入
電力容量は最大6000kWとした。ここに加熱処理は、鋼片
の成分から固相線温度（Ｔ2 ）及び液相線温度（Ｔ3）
を求め、加熱到達温度ＴがＴ2 ≦Ｔ≦（Ｔ2 + Ｔ3 ）／
２を満足する条件で行った。得られた結果を表１に示
す。Example 1 As a steel type, a carbon steel having a carbon content of 20 ppm to 1.3 wt% was used. The rolling conditions are as follows: sheet bar width after rough rolling: 700 to 1900
mm, sheet bar thickness: 25 to 50 mm, and steel sheet thickness on the exit side of the seventh-stage finishing mill: 0.8 to 3.5 mm. As a coil for applying an alternating magnetic field, a pair of iron core coils were arranged above and below the billet joint so that the magnetic field acts on the entire joint width. Power is supplied to the upper and lower coils from the same AC power supply, and the input power capacity is set to a maximum of 6000 kW. Here, the heat treatment is performed based on the components of the steel slab, the solidus temperature (T 2 ) and the liquidus temperature (T 3 )
Is obtained, and the ultimate heating temperature T is T 2 ≦ T ≦ (T 2 + T 3 ) /
The test was performed under the conditions satisfying Condition 2. Table 1 shows the obtained results.
【００１６】[0016]
【表１】 [Table 1]
【００１７】同表から明らかなように、第１発明に従う
最適加熱温度範囲を満足する条件下で加熱接合処理を行
った場合には、いずれも良好な仕上げ圧延を実施するこ
とができた。As is clear from the table, when the heat bonding treatment was performed under the conditions satisfying the optimum heating temperature range according to the first invention, good finish rolling could be performed in each case.
【００１８】実施例２ 鋼種及び圧延条件は実施例１の場合と同様である。加熱
条件は、鋼片の成分から、酸化鉄スケールの溶融温度
（Ｔ1 ）、固相線温度（Ｔ2 ）及び液相線温度（Ｔ3 ）
を求め、加熱到達温度Ｔが（Ｔ1 + Ｔ2 ）／２≦Ｔ≦
（Ｔ2 + Ｔ3 ）／２を満足する条件で行った。ただし、
Ｔ1 ＞Ｔ2 の場合はＴ2 ≦Ｔ≦（Ｔ2 + Ｔ3 ）／２を満
足する条件で行った。得られた結果を表２に示す。Example 2 The steel type and rolling conditions are the same as in Example 1. The heating conditions are as follows: the melting temperature (T 1 ), the solidus temperature (T 2 ), and the liquidus temperature (T 3 ) of the iron oxide scale from the components of the slab.
Is obtained, and the temperature T reached by heating is (T 1 + T 2 ) / 2 ≦ T ≦
The test was performed under the condition that (T 2 + T 3 ) / 2 was satisfied. However,
In the case of T 1 > T 2 , the test was performed under the condition that T 2 ≦ T ≦ (T 2 + T 3 ) / 2. Table 2 shows the obtained results.
【００１９】[0019]
【表２】 [Table 2]
【００２０】同表から明らかなように、第２発明に従う
好適加熱温度範囲を満足する条件下で加熱接合処理を行
った場合には、いずれも実際上問題のない良好な仕上げ
圧延を実施することができた。As is clear from the table, when the heat-bonding treatment is performed under the conditions satisfying the preferable heating temperature range according to the second invention, good finish rolling without any practical problem is performed. Was completed.
【００２１】比較例 鋼種及び圧延条件は実施例１の場合と同様である。加熱
条件は、鋼片の成分から、酸化鉄スケールの溶融温度
（Ｔ1 ）、固相線温度（Ｔ2 ）及び液相線温度（Ｔ3 ）
を求め、加熱到達温度Ｔが（Ｔ1 + Ｔ2 ）／２＞Ｔの条
件で行った。得られた結果を表３に示す。Comparative Example The steel type and rolling conditions were the same as in Example 1. The heating conditions are as follows: the melting temperature (T 1 ), the solidus temperature (T 2 ), and the liquidus temperature (T 3 ) of the iron oxide scale from the components of the slab.
And the heating temperature T was (T 1 + T 2 ) / 2> T. Table 3 shows the obtained results.
【００２２】[0022]
【表３】 [Table 3]
【００２３】同表から明らかなように、加熱条件がこの
発明を満足しない条件下で加熱接合処理を行った場合に
は、いずれも良好な仕上げ圧延を実施することはできな
かった。As is clear from the table, when the heating and joining treatment was carried out under heating conditions not satisfying the present invention, no satisfactory finish rolling could be carried out.
【００２４】以上、実施例では、主に炭素鋼を用いた場
合について説明したか、その他、電磁鋼板や高合金鋼に
適用した場合でも同様の効果が得られることが確認され
ている。また、接合順序は、加熱後に押圧しても、押圧
しつつ加熱しても同様な効果を得ることができ、さらに
加熱手段についても、誘導加熱以外のいずれの公知手段
によっても同様に良好な結果が得られることが確かめら
れている。In the above, the description has been made of the case where carbon steel is mainly used in the embodiments, and it has been confirmed that the same effect can be obtained when the present invention is applied to magnetic steel sheets and high alloy steels. In addition, the bonding order can be obtained by pressing after heating or by heating while pressing, and the same effect can be obtained. Furthermore, as for the heating means, similarly good results can be obtained by any known means other than induction heating. Is obtained.
【００２５】Ｃ含有量について本発明では、２０ｐｐｍ
以上の鋼について示したが、Ｔ2 ，Ｔ3 の温度は２０ｐ
ｐｍ近傍ですでにほとんど変化しないということは明白
であるためＣ＜２０ｐｐｍの鋼についても適用できるこ
とは言うまでもないことである。In the present invention, the C content is 20 ppm
As shown above, the temperature of T 2 and T 3 is 20p
Obviously, there is almost no change near pm, so that it goes without saying that it can be applied to steels with C <20 ppm.
【００２６】[0026]
【発明の効果】かくしてこの発明によれば、鋼種の如何
にかかわらず、熱間圧延ラインにおける鋼片接合を、そ
の後の仕上げ圧延における板破断等のトラブル発生なし
に、確実に達成することができる。As described above, according to the present invention, slab joining in a hot rolling line can be reliably achieved without any trouble such as plate breakage in subsequent finish rolling, regardless of the type of steel. .
【図１】鋼片の炭素含有量と好適加熱温度範囲との関係
を示したグラフである。FIG. 1 is a graph showing the relationship between the carbon content of a slab and a suitable heating temperature range.
【図２】鋼片の炭素含有量と鋼片の液相線温度及び固相
線温度との関係を、酸化スケールの溶融温度及び図１で
求めた圧延状況と共に、示したグラフである。FIG. 2 is a graph showing the relationship between the carbon content of a slab and the liquidus temperature and solidus temperature of the slab, together with the melting temperature of the oxide scale and the rolling state obtained in FIG.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山田 博右 千葉県千葉市中央区川崎町１番地 川崎 製鉄株式会社 千葉製鉄所内 (72)発明者 二階堂 英幸 千葉県千葉市中央区川崎町１番地 川崎 製鉄株式会社 千葉製鉄所内 (72)発明者 磯山 茂 千葉県千葉市中央区川崎町１番地 川崎 製鉄株式会社 千葉製鉄所内 (72)発明者 森本 和夫 広島県広島市西区観音新町４丁目６番22 号 三菱重工業株式会社 広島研究所内 (72)発明者 若元 郁夫 広島県広島市西区観音新町４丁目６番22 号 三菱重工業株式会社 広島研究所内 (72)発明者 林 寛治 広島県広島市西区観音新町４丁目６番22 号 三菱重工業株式会社 広島製作所内 (56)参考文献 特開 平５−318143（ＪＰ，Ａ) 特開 平４−294802（ＪＰ，Ａ) 特開 昭63−26204（ＪＰ，Ａ) 特開 昭61−209715（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) B21B 1/26 B21B 15/00 B23K 20/00 340 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hiro right Yamada 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Chiba Works (72) Inventor Hideyuki Nikaido 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba (72) Inventor Shigeru Isoyama 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Corporation Chiba Works (72) Inventor Kazuo Morimoto 4-622 Kannonshinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Hiroshima Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Ikuo Wakamoto, Inventor 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd., Hiroshima Research Laboratory (72) Kanji Hayashi, Kannon Shinmachi 4, Nishi-ku, Hiroshima City, Hiroshima Prefecture No. 6-22, Hiroshima Works, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-5-318143 (JP, A) JP-A-4-294802 (JP, A) JP-A-63-26204 (JP, A) JP-A-61-209715 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) B21B 1/26 B21B 15/00 B23K 20/00 340
Claims (2)
の後端部と後行する鋼片の先端部を加熱・押圧すること
によって、両鋼片を接合するに際し、少なくとも接合該
当部位の温度Ｔ（℃）が、次式 Ｔ2 ≦Ｔ≦（Ｔ2 + Ｔ3 ）／２ ここで、Ｔ2 : 鋼片の固相線温度（℃） Ｔ3 : 鋼片の液相線温度（℃） を満足する温度条件下に押圧することを特徴とする鋼片
の接合方法。In a hot rolling line, at the time of joining both steel slabs by heating and pressing a rear end of a preceding steel slab and a front end of a succeeding steel slab, at least the temperature of a portion corresponding to the joint is determined. T (° C.) is the following equation: T 2 ≦ T ≦ (T 2 + T 3 ) / 2 where T 2 : solidus temperature of steel slab (° C.) T 3 : liquidus temperature of steel slab (° C.) A method for joining billets, characterized by pressing under temperature conditions satisfying (1).
の後端部と後行する鋼片の先端部を加熱・押圧すること
によって、両鋼片を接合するに際し、少なくとも接合該
当部位の温度Ｔ（℃）が、下記 (1)式又は (2)式を満足
する温度条件下に押圧することを特徴とする鋼片の接合
方法。 記 (1) Ｔ1 ≦Ｔ2 の場合 （Ｔ1 + Ｔ2 ）／２≦Ｔ≦（Ｔ2 + Ｔ3 ）／２ ---(1) (2) Ｔ1 ＞Ｔ2 の場合 Ｔ2 ≦Ｔ≦（Ｔ2 + Ｔ3 ）／２ ---(2) ここで、Ｔ1 : 酸化鉄スケールの溶融温度（℃） Ｔ2 : 鋼片の固相線温度（℃） Ｔ3 : 鋼片の液相線温度（℃）2. In a hot rolling line, at the time of joining both steel slabs by heating and pressing the rear end of the preceding steel slab and the front end of the subsequent steel slab, at least the temperature of the portion corresponding to the joint is determined. A method for joining steel slabs, wherein T (° C.) is pressed under a temperature condition satisfying the following expression (1) or (2). (1) When T 1 ≦ T 2 (T 1 + T 2 ) / 2 ≦ T ≦ (T 2 + T 3 ) / 2 --- (1) (2) When T 1 > T 2 T 2 ≦ T ≦ (T 2 + T 3 ) / 2 --- (2) where T 1 : melting temperature of iron oxide scale (° C.) T 2 : solidus temperature of steel slab (° C.) T 3 : steel Liquidus temperature of piece (℃)
Priority Applications (28)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5328733A JP2992188B2 (en) | 1993-12-24 | 1993-12-24 | How to join billets |
| PCT/JP1994/002113 WO1995016525A1 (en) | 1993-12-16 | 1994-12-15 | Method of and apparatus for joining metal pieces |
| US09/352,163 US6184508B1 (en) | 1993-12-16 | 1994-12-15 | Apparatus for joining metal pieces using induction heating |
| EP95902966A EP0691163B1 (en) | 1993-12-16 | 1994-12-15 | Method of and apparatus for joining metal pieces |
| CN94191633A CN1069070C (en) | 1993-12-16 | 1994-12-15 | Method of and apparatus for joining metal pieces |
| DE69430275T DE69430275T2 (en) | 1993-12-16 | 1994-12-15 | Method of joining pieces of metal |
| US08/513,789 US5951903A (en) | 1993-12-16 | 1994-12-15 | Method and apparatus for joining metal pieces |
| DE69432377T DE69432377T2 (en) | 1993-12-16 | 1994-12-15 | Method and device for connecting pieces of metal |
| CA002255435A CA2255435C (en) | 1993-12-16 | 1994-12-15 | Method and apparatus for joining metal pieces |
| EP00100924A EP1008398B1 (en) | 1993-12-16 | 1994-12-15 | Method for joining metal pieces |
| CNB031452701A CN100371096C (en) | 1993-12-16 | 1994-12-15 | Method of connecting metal plate |
| KR1019950703412A KR100249663B1 (en) | 1993-12-16 | 1994-12-15 | Method and apparatus for joining metal pieces |
| CA002255463A CA2255463C (en) | 1993-12-16 | 1994-12-15 | Method and apparatus for joining metal pieces |
| DE69432326T DE69432326T2 (en) | 1993-12-16 | 1994-12-15 | Method of joining pieces of metal |
| CNB031452698A CN1283378C (en) | 1993-12-16 | 1994-12-15 | Apparatus for joining metal pieces |
| EP01111336A EP1122019B1 (en) | 1993-12-16 | 1994-12-15 | Apparatus and method for joining metal pieces |
| CA002255442A CA2255442C (en) | 1993-12-16 | 1994-12-15 | Method and apparatus for joining metal pieces |
| EP00100933A EP1008399B1 (en) | 1993-12-16 | 1994-12-15 | Method for joining metal pieces |
| CA002255417A CA2255417C (en) | 1993-12-16 | 1994-12-15 | Method for joining metal pieces |
| DE69430474T DE69430474T2 (en) | 1993-12-16 | 1994-12-15 | METHOD AND DEVICE FOR CONNECTING METAL PIECES |
| CA002156195A CA2156195C (en) | 1993-12-16 | 1994-12-15 | Method and apparatus for joining metal pieces |
| TW083112115A TW302306B (en) | 1993-12-16 | 1994-12-23 | |
| US09/351,463 US6252211B1 (en) | 1993-12-16 | 1999-07-12 | Method of joining metal pieces |
| US09/352,164 US6262402B1 (en) | 1993-12-16 | 1999-07-12 | Method and apparatus for joining metal pieces using induction heating |
| US09/352,157 US6218649B1 (en) | 1993-12-12 | 1999-07-12 | Method and apparatus for joining metal pieces using induction heating |
| US09/351,372 US6248984B1 (en) | 1993-12-16 | 1999-07-12 | Method and apparatus for joining metal pieces |
| CN00102272A CN1126612C (en) | 1993-12-16 | 2000-02-18 | Apparatus for connecting metal plate band |
| CN00102271A CN1126611C (en) | 1993-12-16 | 2000-02-18 | Method for connecting metal plate bands |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5328733A JP2992188B2 (en) | 1993-12-24 | 1993-12-24 | How to join billets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07178418A JPH07178418A (en) | 1995-07-18 |
| JP2992188B2 true JP2992188B2 (en) | 1999-12-20 |
Family
ID=18213573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5328733A Expired - Fee Related JP2992188B2 (en) | 1993-12-12 | 1993-12-24 | How to join billets |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2992188B2 (en) |
-
1993
- 1993-12-24 JP JP5328733A patent/JP2992188B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07178418A (en) | 1995-07-18 |
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