JPS58196103A - Warm rolling method of steel strip - Google Patents

Abstract

PURPOSE:To make use of the heat retained in a strip after hot rolling and to economize the consumption of driving power for cold rolling by subjecting said strip in a high temp. state to mechanical descaling then cooling the same to a proper temp. and cold rolling the cooled strip. CONSTITUTION:A strip which is uncoiled from a hot rolled coil 1 of a high temp. is passed through a rolling mill 2 of light rolling down to fine coil break and is then conducted to a mechanical descaling device 3, where the strip is descaled by blasting of a slurry contg. sand iron in the state of the high temp. The strip is conducted into a temp. controller 4 where the strip is cooled down to the temp. optimum for cold rolling and is then passed through a cold rolling mill 5. The temp. of the strip to be passed through the mill 5 is selected within the temp. range of about 50-250 deg.C and at the temp. at which the rolling load is least according to the steel kind of the strip. The heat is recovered through the salt bath or rolling mill oil or the like used in said controller 3, whereby the energy is economized additionally.

Description

【発明の詳細な説明】 本発明は、熱姉コイルの顕熱を冷間圧延に利用し、圧延
動力の軽減を図るス）　ＩＪツブの温間圧延法に係る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a warm rolling method for IJ tubes in which the sensible heat of a hot sister coil is used in cold rolling to reduce rolling power.

周知のように、熱間圧延された熱延コイルは通常４５０
〜７００℃で巻取られ、次工程での酸洗ラインにおける
製品の腰折れ対策或いはゴムロールの焼付きなどの設備
上の制約から、８０℃前後の投入温度となるよう冷却ヤ
ードで冷却される。As is well known, hot-rolled hot-rolled coils are usually 450
It is wound up at ~700°C, and cooled in a cooling yard to a charging temperature of around 80°C due to equipment constraints such as measures against bending of the product in the pickling line in the next process and seizure of rubber rolls.

この冷却には長時間を安し、且つ保有熱ロスを伴なうた
め、最近この熱延コイルを積極的に冷却し、その保有熱
を回収しようとする提案がなされている。Since this cooling requires a long period of time and involves a loss of retained heat, proposals have recently been made to actively cool the hot-rolled coil and recover the retained heat.

例えば、酸洗ライン前面でのソルトバス利用による蒸気
エネルギー変換などはその例であるが、その回収エネル
ギーの利用の面などの検討も含め。An example of this is steam energy conversion using a salt bath in front of a pickling line, but consideration should also be given to the use of recovered energy.

早期の具現化が要求されている。Early implementation is required.

一方従来から酸洗後の圧延については、冷間圧延と称し
、室温での圧延が常識となっている。ところが銅帯温度
を上昇させるにつれて、鋼宙の変形抵抗は変化し１ｗ４
種によって一旦軟化し、その后肖勢脆化によって硬化す
るものや、連続的に軟化し続けるもの力・あり、いずれ
にせよ圧延磁度を現在よりも上昇させることにより、圧
延消費動力の低下゛が図れる。On the other hand, rolling after pickling has traditionally been called cold rolling, and rolling at room temperature has become common knowledge. However, as the temperature of the copper strip increases, the deformation resistance of the steel chamber changes and becomes 1w4.
Some types soften once and then harden due to embrittlement, and others continue to soften, but in any case, by increasing the rolling magnetic field compared to the current level, the power consumption for rolling can be reduced. can be achieved.

これまでそれぞれの分封で省エネルギ一対策が瑛６Ｊさ
れ、実施されてきているか１両者の組合せ。Until now, energy saving measures have been taken for each package, and a combination of both has been implemented.

即ち博恨製造−貫プロセスとしての省エネルギ一対策は
、むしろ酸洗工程の存在がＰＩｉｉ路となって断たノ′
シているりが実情である。In other words, the energy saving measures as part of the manufacturing process were cut off due to the presence of the pickling process.
The reality is that it is very simple.

本発明はこれらの実情に鑑み、熱煤コイルの保奪熱を冷
延時のス）　ＩＪツブ温度の上昇に利用して圧延消費動
力の軽減に役立て、もってエネルギーの回収を図らんと
するものであり、特にデスケーリングとして酸洗を行な
わずに、温度制約のないメカニカルデスケーリングを適
用し、１ｗ＋温でのメカニカルデスケーリングを行なう
ことを特徴の１つとしている。In view of these circumstances, the present invention aims to utilize the heat retained and removed by the hot soot coil to raise the temperature of the IJ tube during cold rolling, thereby reducing the rolling power consumption and thereby recovering energy. One of the features is that mechanical descaling without temperature restrictions is applied without pickling as descaling, and mechanical descaling is performed at 1W+temperature.

従来から、砂鉄入りスラリーを吹付ける等のメカニカル
デスケーリングそのものは周知であるが。Mechanical descaling itself, such as spraying slurry containing iron sand, has been well known.

コイル顕熱回収の観点から、これを熱間でメカニカルデ
スケーリングを行なう例、はない。From the point of view of coil sensible heat recovery, there is no example of performing mechanical descaling in a hot state.

以下本発明を図面に示す実施例に基づいて具体的に説明
する。The present invention will be specifically described below based on embodiments shown in the drawings.

第１図にお０て１は熱延コイルであり、巻きほどかれた
高温のストリソ５プは軽圧下圧延１安２を通過して、メ
カニカルデスケーリング装置Ｉｔ３に導かれ、熱間のま
＼デスケーリン夛氷れ１次いで温度調節装置１ｔ４で、
冷間圧延に最適な温度まで冷却され、冷間圧延機５に導
く。図中６は浴接機、７はループカー、８はシャーを示
す。In Fig. 1, 1 is a hot-rolled coil, and the unwound high-temperature strip 5 passes through a light reduction rolling 1 and 2, is guided to a mechanical descaling device It3, and is heated while still hot. Descaling ice 1 and then temperature control device 1t4,
It is cooled to the optimum temperature for cold rolling, and then introduced to the cold rolling mill 5. In the figure, 6 indicates a bath welding machine, 7 indicates a loop car, and 8 indicates a shear.

冷間圧延機５に通板されるス）　ＩＪツブの温度は鋼種
に応じて異なる。例えば第２図に示すように。The temperature of the IJ tube passed through the cold rolling mill 5 differs depending on the steel type. For example, as shown in FIG.

鋼種Ａでは圧延時の銅帯温度と圧延負荷との関係は、温
度の上昇とともに圧延負荷は改善されるが。In steel type A, the relationship between the copper strip temperature during rolling and the rolling load is such that the rolling load improves as the temperature rises.

ある温度を超えると再び圧延負荷増大の方向にうつる。When the temperature exceeds a certain point, the rolling load increases again.

従ってこの一種では、７００〜１３０　℃が最適温度範
囲ａとなり、−刃組３図に示す鋼種Ｂでは、温度の上昇
をはソ比例的に圧延負荷が改善され、従ってこの場合に
は１３０℃以上の高い温度領域が最適範囲ａとして選択
される。Therefore, for this type, the optimum temperature range a is 700 to 130°C, and for steel type B shown in Fig. 3 of the blade set, the rolling load is improved proportionally to the rise in temperature, so in this case, the temperature range is 130°C or higher. A high temperature range is selected as the optimum range a.

しかしいずれの場合でも、５０℃以ドでは効果が小さく
、一方２５０℃以上では銅帯表面上に酸化膜が厚く生じ
、後工程の焼鈍工程で還元除去しにくくなる上、鋼種に
よってはｒ値（ラングフォート値）の低下を伴なうので
好まし≦ない。However, in any case, the effect is small at temperatures below 50°C, while at temperatures above 250°C a thick oxide film forms on the surface of the copper strip, making it difficult to reduce and remove in the subsequent annealing process, and depending on the steel type, the r value ( Langfort value) is accompanied by a decrease, so it is not preferable.

熱面でデスケーリングされたストリップでは。In the thermally descaled strips.

また充分に高温を有しており、これを前記のように鋼種
に応じて、最適なｍ間圧延温度まで冷却するのか第２の
特徴である。この温度調節装置３としては、ソルトバス
或いは圧延油などが用られ。The second feature is that it has a sufficiently high temperature, and that it can be cooled down to the optimum rolling temperature for m depending on the steel type as described above. As this temperature control device 3, a salt bath, rolling oil, or the like is used.

所定の温度に維持される。maintained at a predetermined temperature.

従ってその殆んどの場合がストリップに対しては冷却作
用をもたらし、一部はこの温度調節装置から熱を回収す
ることもできる。又ストリップが何等かの理由により低
温となった場合には、この温度調節装置３で加熱を行な
うこともあり得る。In most cases, therefore, a cooling effect is exerted on the strip, and in some cases it is also possible to recover heat from this temperature regulating device. Further, if the temperature of the strip becomes low for some reason, the temperature control device 3 may be used to heat the strip.

２で示す軽圧下圧延機は、必ずしも必要なものではない
が、熱延コイルの腰折を微細化するという品質上の効果
があり、これを配置することは極めて好ましい。Although the light reduction rolling mill indicated by 2 is not necessarily necessary, it has the quality effect of making the bends in the hot-rolled coil finer, and it is extremely preferable to arrange it.

次に本発明の実施例を示す。Next, examples of the present invention will be shown.

熱延コイル温度；３００℃（−ｆ！ＩｆＡ）通板速度；
　１５０　ｍｐｍ メカニカルデスク−リング装置；　初砕砂妖人りスラリ
ー投射装筐出側温度 １７０℃ 温度調節装置；ソルトバス温度１２０℃冷間圧延機入側
ストリップ温度；１００℃冷間圧延圧十−率；７０％ ′帛温冷間圧処との圧延消費動力比収（８ｇ１表）第１
表 以上のように本発明によれば、熱延コイルの保有熱は同
じ系における冷間圧延消費動力低下となって直接に利用
されるので、極めて現実的な顕熱回収効果をあげること
ができる。Hot rolled coil temperature; 300°C (-f! IfA) Threading speed;
150 mpm Mechanical desk ring device; First crushing sand slurry projection device temperature on the outlet side of the casing 170°C Temperature control device; salt bath temperature 120°C Cold rolling mill inlet strip temperature: 100°C Cold rolling rolling ratio: 70 % 'Rolling power consumption specific yield with hot and cold rolling treatment (8g1 table) 1st
As shown in the table above, according to the present invention, the retained heat of the hot-rolled coil is directly used to reduce the power consumption of cold rolling in the same system, so it is possible to achieve a very realistic sensible heat recovery effect. .

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明による設備配置の説明図、第２図及び第
３図は異なった鋼種における冷間圧延時のｍ常温度と圧
延負荷との関係の図表である。 １：熱延コイル　　　　２：軽圧ド圧延機３：メカニカ
ルデスケーリング装置 ４：温度調節装置FIG. 1 is an explanatory diagram of the equipment arrangement according to the present invention, and FIGS. 2 and 3 are charts showing the relationship between normal temperature and rolling load during cold rolling for different steel types. 1: Hot rolled coil 2: Light rolling mill 3: Mechanical descaling device 4: Temperature adjustment device

Claims (1)

【特許請求の範囲】 高温の熱延コイルを巻き戻したストリップを。 尚温状態でメカニカルデスケーリングし、次いで該スト
リップを温度調節装置に導いて所定の温度域まで冷却し
冷間圧延することを特徴とする銅帯の温間圧延法。[Claims] A strip obtained by unwinding a hot-rolled coil at high temperature. 1. A method for warm rolling a copper strip, which comprises mechanically descaling the strip while it is still hot, and then introducing the strip to a temperature control device to cool it to a predetermined temperature range and cold rolling it.