JPS60213383A - Continuous joining method of high-temperature thick steel plates - Google Patents

Abstract

PURPOSE:To improve productivity in rolling operation by pouring a high-temp. molten steel into the space formed of the ends of preceding and succeeding billets and copper straps and cooling said steel to solidify on a heat resistant traveling belt then subjecting the billets to continuous rolling. CONSTITUTION:A clearance W is maintained between the high-temp. billets 1 and 2 on the heat resistant traveling belt 8 and the apertures on both sides in the transverse direction are closed by water-cooled copper straps. The molten steel 3 is poured from a vessel 7 for the molten steel into the space formed of the rear end of the preceding billet 1, the front end of the succeeding billet 2 and the copper straps. The vessel 7 is removed upon completion of pouring. The billets 1, 2 are transferred on the belt 8 and the molten metal 3 cools to solidify, thus forming a joint layer 4. The billets 1, 2 joined via the layer 4 are conducted to rolling rolls by the belt 8 and are successively rolled to a product. Since the joining is completed simply by pouring and cooling of the molten steel, the productivity in the rolling operation is improved.

Description

【発明の詳細な説明】 本発明は、鋼材の接合方法に関し、さらに詳細には鋼材
の連続熱間圧延工程において先行鋼片と後行鋼片と【接
合する厚鋼材の接合方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining steel materials, and more particularly relates to a method for joining thick steel materials to be joined between a preceding steel billet and a following steel billet in a continuous hot rolling process of steel materials. .

従来、鋼材を熱間圧延する場合は、通常、所定長さの鋼
片を１本ずつ間欠的に圧延機に供給し、圧延を行ってい
る。この場合、鋼片の先端部と後端部においては形状不
良が生じて切り捨てるので製品歩留ｐが悪くなるば〃）
やでなく、鋼片端部がロールに噛み込み、あるいはロー
ルから排出されるたびに衝撃荷重が加わシ、ロール疵が
発生する機会が多くなり、ロール取替費用やロール取替
のための圧延停止の時間ロス等が問題となっていた。そ
こで、複数枚の鋼片をあらかじめ接続し、連続的に圧延
する工うにすれば、上記問題を生ずることがなく、生産
性？大幅に向上し得ることが考えられる。Conventionally, when hot rolling steel materials, steel slabs of a predetermined length are usually intermittently supplied one by one to a rolling mill for rolling. In this case, the tip and rear ends of the steel billet will have a defective shape and will be cut off, resulting in a poor product yield p.)
In addition, every time the end of the steel piece gets caught in the roll or is ejected from the roll, an impact load is applied, which increases the chances of roll flaws, resulting in roll replacement costs and rolling stoppages for roll replacement. The time loss was a problem. Therefore, if multiple pieces of steel are connected in advance and rolled continuously, the above problem will not occur and productivity will be improved. It is conceivable that this can be significantly improved.

一般に、比較的板厚の薄い鋼板（初期板厚１０＋ｗ＋以
下）を連続冷間圧延する場合には、第１図に示される工
うなフラッシュバット溶接等で鋼材を接続する方法が採
用されているが、熱間圧延工程では板厚が厚い（初期板
厚　３０〜２ぢ０■）ため溶接装置能力が不足し、この
ような方法では全断面を短時間で接合することは困難で
ある。Generally, when continuously cold rolling relatively thin steel plates (initial thickness 10+w+ or less), a method of connecting the steel materials using flash butt welding or the like shown in Figure 1 is used. In the hot rolling process, the welding equipment capacity is insufficient because the plate is thick (initial plate thickness 30 to 20 cm), and it is difficult to join the entire cross section in a short time using such a method.

そこで、第２図お工び第３図に見られるように、前後の
鋼片の端部金型ね合わせ、鋲ま７Ｃは釘状材を打込んだ
り、溶接したりして仮止めしたのちロール等で圧接する
方法があるが、これらの方法も板厚５０閣以上の厚鋼片
には殆んど採用不可能であり、ま７ｃ３０〜５０ｍｍの
板厚の場合でも重ね部を長＜（１００ｍ以上）取らなけ
ればならず、該部分は通常部とは異なる特殊な予圧延工
程上必要とし、さらに、これら接合部分鉱最終的には切
取ってスクラップ化されるので接合部分が長いほど製品
の歩留りが悪化するという欠点もあった。このため、初
期板厚３０〜２５０闘の厚鋼片を高能率、低コストで接
続して連続熱間圧延し得る技術の開発が強く要望されて
きた。Therefore, as shown in Fig. 2 and Fig. 3, the end molds of the front and rear steel pieces were fitted together, and the rivet 7C was temporarily fixed by driving a nail-like material or welding. There is a method of pressure welding with rolls, etc., but these methods are almost impossible to use for thick steel pieces with a thickness of 50 mm or more, and even in the case of a plate thickness of 30 to 50 mm, the overlapped part cannot be made long. 100m or more), and this part is required for a special pre-rolling process that is different from the normal part.Furthermore, these joint parts are ultimately cut off and scrapped, so the longer the joint part, the worse the product. There was also the drawback that the yield of For this reason, there has been a strong demand for the development of a technology that can connect and continuously hot-roll thick steel slabs with an initial thickness of 30 to 250 mm with high efficiency and low cost.

本発明は、以上の工うな従来の間鴎点に鑑み、厚鋼片を
簡単な工程で高能率に接合でき、し〃≧も、完全な接合
が得られる淳鋼材の接合方法會提供することｔ目的とす
るものであって、複数の鋼片を連続して圧延する鋼片の
熱間連続圧延工程において、先行鋼片の後端部と後行鋼
片の先端部を耐熱走行ベルト上に所定間隔ｔおいて設置
し、この間隙両側の開口部に外方１夛水冷した銅当金を
押し付け、前記先行鋼片後端部。In view of the above-mentioned conventional problems, the present invention provides a method for joining thick steel materials, which can join thick steel pieces with a simple process and with high efficiency, and which can also achieve a perfect joint. In the hot continuous rolling process of steel billets in which multiple steel billets are continuously rolled, the trailing end of the leading billet and the tip of the trailing billet are placed on a heat-resistant running belt. Installed at a predetermined interval t, one water-cooled copper dowel is pressed outward into the openings on both sides of this gap, and the rear end of the preceding steel piece is pressed.

後行鋼片先端部お工び銅当金で形成された空間に高温溶
鋼全注入し、前記ベルト上を走行させながら前記溶鋼を
冷却凝固させ１ｃのち、鋼片全連続圧延すること全特徴
とする。All of the high temperature molten steel is injected into the space formed by the copper dowel at the leading end of the trailing billet, the molten steel is cooled and solidified while running on the belt, and after 1c, the billet is fully continuously rolled. do.

以下、図面に工す本発明方法の詳細につき説明する。Hereinafter, details of the method of the present invention applied to the drawings will be explained.

第４図、第５図お工び第６図は本発明方法が実施される
状況全示したもので、第４図は溶鋼注入ならびに冷却時
の側断面図、第５図は同平面図、第６図は圧延時の側断
面図である。高温の鋼片１，２は耐熱走行ベルト８上に
載置されて移動する。この時、先行鋼片ｌの後端部と後
行鋼片２の先端部との間には、間ＮＷが保持されている
。仁のＷの間隙の鋼片幅方向両側の開口部分は、銅製の
当金９で閉塞される。この当金９はウォータジャケット
となっておジ、冷却水１０にＬ！ｌｌ冷却されるもので
あり、鋼片幅方向外方↓りＦｌの力で押し付けられてい
る。Figures 4 and 5 show the entire situation in which the method of the present invention is carried out. Figure 4 is a side sectional view during injection and cooling of molten steel, Figure 5 is a plan view of the same, FIG. 6 is a side sectional view during rolling. The hot steel pieces 1 and 2 are placed on a heat-resistant running belt 8 and moved. At this time, a gap NW is maintained between the rear end portion of the leading steel piece l and the tip end of the trailing steel piece 2. The openings on both sides of the gap W in the width direction of the steel strip are closed with copper pads 9. This deposit 9 becomes a water jacket, and the cooling water 10 is L! ll is cooled, and is pressed outward in the width direction of the steel piece with a force of Fl.

このような状態で先行鋼片１と後行鋼片２とｔ耐熱走行
ベルト８で移動させながら、前記Ｗの間隙、すなわち先
行鋼片ｌの後端部、後行鋼片２の先端部お工び銅当金９
にニジ形成された空間に溶鋼３を注入する。この溶銅３
は、空間の上方にセットされ高温の溶鋼６會収容した溶
鋼容器７ρ）ら注入される。溶鋼容器７は耐火物内張を
有するとリペまたはタンディツシュであり、図示しない
が下部の溶鋼注出ノズルにストッパを備え、このストッ
パの操作にエカ前記空間への溶鋼注入翻始ならひに閉止
が行われる。In this state, while moving the leading steel slab 1, the trailing steel slab 2, and the heat-resistant traveling belt 8, the gap W, that is, the rear end of the leading steel slab 1, the tip end of the trailing steel slab 2, and the Machined copper dowel 9
The molten steel 3 is injected into the space formed in the hole. This molten copper 3
is injected from a molten steel container 7ρ) set above the space and containing six volumes of high-temperature molten steel. The molten steel container 7 has a refractory lining and is equipped with a stopper on the lower molten steel pouring nozzle (not shown). It will be done.

図中５でボされているのは、溶９１４３の表面に浮遊す
るスラグである。In the figure, 5 is the slag floating on the surface of the melt 9143.

溶鋼３が前記空間を満たすまで注入が終れば前記溶鋼容
器７會撤去し、鋼片１，２はそのまま耐熱走行ベルト８
に↓り移送され、その閾に＃ｇＩ１４３は冷却凝固して
接合層４となり、先行鋼片１と後行鋼片２とはこの接合
層４を介して接合された状態となる。この状態で鋼片１
，２はさらに耐熱走行ベルト８で送られて圧延ロール１
１に導かれ、板厚１０ρ１ら１１に圧延され、さらに図
示しない下流側の圧延機群を順次通過して連続的に薄板
等の製品に圧延される。なお、１２は耐熱走行ベルト駆
動ローラである。When the injection of molten steel 3 is completed until it fills the space, the molten steel container 7 is removed, and the steel slabs 1 and 2 are placed on the heat-resistant running belt 8.
#gI 143 is transferred to the threshold and cooled and solidified to form a bonding layer 4, and the leading steel piece 1 and the trailing steel piece 2 are in a state of being joined via this bonding layer 4. In this state, steel piece 1
, 2 are further conveyed by a heat-resistant running belt 8 to the rolling roll 1.
1 and rolled to a plate thickness of 10ρ1 to 11, and then sequentially passed through a group of rolling mills on the downstream side (not shown) to be continuously rolled into products such as thin plates. Note that 12 is a heat-resistant running belt drive roller.

一般に鋼片の熱間圧延では、板厚はスラブの場合２００
〜２５０　ｗａ、　バー（Ｄ場合３０〜５゜瓢、温度は
スラブの場合１１５０℃程度、パーの場合１０００℃程
度に加熱されている。従って、接合部表面（前記鋼片１
，２の端面）を前もって高圧水等にエタデスヶーリング
し、さらに委すればその表面に還元剤やフラックスを吹
きっけた上で前記のように溶鋼を注入すると、溶鋼３は
その上表面に生じたスラグ５で大気を遮断しながら前記
接合部表面と接触し、その保有熱で鋼片１，２の一部が
溶融する。そして前記の如く溶鋼３が冷却凝固すること
によって鋼片１゜２は浴９４Ｉ４３が凝固した接合ｒｔ
ｔｉ４＊介して接合されることとなる。なお、上記フラ
ックスには公知の−ｑ酸、珪醒ソーダ等が用いられる。Generally, when hot rolling steel billets, the plate thickness is 200 mm for slabs.
~250 wa, the bar (30~5° for D) is heated to about 1150°C for slab and 1000°C for par.
, 2 (end faces of 2) in advance with high-pressure water, etc., and then spray a reducing agent or flux on the surface and then inject molten steel as described above, the molten steel 3 The generated slag 5 contacts the surface of the joint while blocking the atmosphere, and a portion of the steel slabs 1 and 2 melts due to the retained heat. Then, as mentioned above, the molten steel 3 cools and solidifies, and the steel slab 1゜2 becomes the joint rt where the bath 94I43 has solidified.
They will be joined via ti4*. In addition, the well-known -q acid, silicate soda, etc. are used for the above-mentioned flux.

また、上記工程において、溶鋼の凝固時には収縮を生ず
るので後行鋼片２の後方刀１ら力Ｆｚｋ加えて押し付け
る。次に、溶鋼３が冷却し凝固が完了した状態で銅当金
９を取り除き、鋼片１，２は圧延ロール１１に送給され
て連続圧延されるが、圧延ローラに入る前に接合層４の
上外面に残存しているスラグ５はデスケーラ（図示しな
いンに工って除去される。なお、第６図のＣＦＩ）は先
行鋼片１の圧延状況を、（ｂ）は接合ｉ、１ｉ４が圧延
ロール１１を通過した後の後行鋼片２の圧延状況を示し
ている。In addition, in the above process, since contraction occurs when the molten steel solidifies, a force Fzk is applied to the rear blade 1 of the trailing steel piece 2 to press it. Next, after the molten steel 3 has cooled and solidified, the copper dowel 9 is removed, and the steel slabs 1 and 2 are fed to the rolling rolls 11 and continuously rolled. The slag 5 remaining on the upper and outer surfaces of the slab is removed by a descaler (not shown).The CFI in Figure 6 shows the rolling status of the preceding slab 1, and (b) shows the rolling status of the preceding slab 1. shows the rolling status of the trailing steel billet 2 after passing through the rolling rolls 11.

く実施例〉 供試鋼片として板厚２５０■、板幅１０００ｍｍのスラ
ブと板厚５０ｍ、板幅１０００■のバー上用い、本発明
による方法に工って鋼片の接合試験葡行い、溶鋼の温度
、鋼片間の間隙Ｗ【椎々に変化させた場合の接合状態を
調査、検討した。Examples〉 A slab with a thickness of 250mm and a width of 1000mm and a bar with a thickness of 50m and a width of 1000mm were used as specimen steel pieces, and a joining test of the steel pieces was conducted using the method according to the present invention. We investigated and examined the bonding conditions when the temperature and the gap W between the steel pieces were varied.

その結果に＆表に示す。The results are shown in &Table.

この試験の結果に工れば、溶鋼の温度が低い場合や間隙
が狭い場合に接合不良が生じ、逆に間隙が広過ぎる場合
に収縮にＬる割れや凝固時間が長くなる不具合を生じ、
連続圧延が不可能となる。（賦香１，５，６．１０）Ｌ
かし、溶鋼温度や間隙？適正にした場合には良好な接合
状態が得られ、連続圧延が可能であった。（賦香２，３
，４，７．９）かくして、適正な溶鋼温度や間隙Ｗの［
［’ｌｉ−選定することにニジ、本発明に↓つて高温鋼
片を高能率に接合して連続圧延上行うことが充分可能で
あることが立証された。Based on the results of this test, poor joining will occur if the temperature of the molten steel is low or the gap is narrow, and conversely, if the gap is too wide, cracks due to shrinkage or problems such as a prolonged solidification time will occur.
Continuous rolling becomes impossible. (Incense 1, 5, 6.10) L
However, molten steel temperature and gap? When properly applied, a good bonding state was obtained and continuous rolling was possible. (Incense 2, 3
, 4, 7.9) Thus, appropriate molten steel temperature and gap W [
It has been proved that it is possible to join high-temperature steel billets with high efficiency and carry out continuous rolling according to the present invention.

以上の説明ニジ明らη≧なとおシ、本発明方法は耐熱走
行ベルト上に所定間１！Ｊａ−おいて設置され九両鋼片
間に溶鋼を注入、凝固させることに工って厚鋼片の接合
を行うものであり、接合前に鋼片端部を特別な形状に成
形しておく必要が全くなく、溶鋼の注入、冷却だけで接
合が完了し、きわめて高能率に鋼片の接合を行うことが
でき、圧延作業の生産性向上に寄与するところが大きい
。また、連続熱間圧延設備は一般に製鋼工場に近接して
設けられることが多いので、本発明方法は製鋼造塊作業
の余り湯等を利用して軽済的にも有利に実施することが
できる。It is clear from the above explanation that η≧, and the method of the present invention is applied to the heat-resistant running belt for a predetermined period of time. This is a method to join thick steel pieces by injecting molten steel between two steel pieces and solidifying it, and the ends of the steel pieces must be formed into a special shape before joining. There is no problem at all, and joining can be completed simply by injecting molten steel and cooling, making it possible to join billets with extremely high efficiency, which greatly contributes to improving the productivity of rolling operations. Furthermore, since continuous hot rolling equipment is generally installed close to a steelmaking factory, the method of the present invention can be carried out advantageously in terms of cost by utilizing leftover hot water from steelmaking ingot operations. .

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

第１図は鋼板の接合方法を示す説明図、第２図、第３図
は従来の鋼片接合方法を示す説明図、第４図は本発明方
法による溶鋼注入、冷却時の側断面図、第５図は同平面
図、第６図は圧延時の側断面図である。 図面中、 １は先行鋼片、 ２は後行鋼片、 ３は溶鋼、 ４は接合層、 ７は溶鋼容器、 ８は耐熱走行ベルト、 ９は銅当金、 １０は冷却水、 １１は圧延ロールである。 特許出願人 三菱重工業株式会社 復代理人 弁理士　光　石　士　部（他１名〕Fig. 1 is an explanatory diagram showing a method of joining steel plates, Figs. 2 and 3 are explanatory diagrams showing a conventional method of joining steel plates, and Fig. 4 is a side sectional view of molten steel injection and cooling according to the method of the present invention. FIG. 5 is a plan view of the same, and FIG. 6 is a side sectional view during rolling. In the drawing, 1 is a leading steel piece, 2 is a trailing steel piece, 3 is molten steel, 4 is a bonding layer, 7 is a molten steel container, 8 is a heat-resistant running belt, 9 is a copper dowel, 10 is a cooling water, 11 is a rolling It's a roll. Patent applicant: Mitsubishi Heavy Industries, Ltd. Patent attorney: Shibu Mitsuishi (and 1 other person)

Claims (1)

【特許請求の範囲】[Claims] 複数の鋼片を連続して圧延する鋼片の熱間連続圧延工程
において、先行鋼片の後端部と後行鋼片の先端部全耐熱
走行ベルト上に所足間隙會おいて設置し、この間隙両側
の開口部に外方工ｐ水冷した銅当金全弁し付け、前記先
行鋼片後端部、後行鋼片先端部お工び銅当金で形成され
た空間に高温溶鋼を注入し、前記ベルト上を走行させな
がら前記溶鋼を冷却凝固させたのち鋼片を連続圧延する
ことを特徴とする高温厚鋼材の連続接合法。In the continuous hot rolling process of steel billets in which a plurality of steel billets are continuously rolled, the rear end of the leading steel billet and the tip of the trailing steel billet are all placed on the heat-resistant running belt with a certain gap, Attach water-cooled copper dowels to the openings on both sides of this gap, and pour high-temperature molten steel into the space formed by the copper dowels at the rear end of the preceding steel piece and the tip of the trailing steel piece. A method for continuously joining high-temperature thick steel materials, characterized in that the molten steel is injected, cooled and solidified while traveling on the belt, and then the billet is continuously rolled.