JPH07314006A - Method for hot-rolling joined slab - Google Patents

Method for hot-rolling joined slab

Info

Publication number
JPH07314006A
JPH07314006A JP11159894A JP11159894A JPH07314006A JP H07314006 A JPH07314006 A JP H07314006A JP 11159894 A JP11159894 A JP 11159894A JP 11159894 A JP11159894 A JP 11159894A JP H07314006 A JPH07314006 A JP H07314006A
Authority
JP
Japan
Prior art keywords
rolling
joining
hot
joined
width
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.)
Pending
Application number
JP11159894A
Other languages
Japanese (ja)
Inventor
Takaaki Nakamura
隆彰 中村
Seiji Arisumi
誠治 有墨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP11159894A priority Critical patent/JPH07314006A/en
Publication of JPH07314006A publication Critical patent/JPH07314006A/en
Pending legal-status Critical Current

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  • Metal Rolling (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

PURPOSE:To provide a hot-rolling method which enables pressurized joining of materials having high ratio of thickness to width of sheet bars and reduces breaking at the time of rolling after preliminary joining. CONSTITUTION:In continuous hot rolling in which the bars are joined before continuous finish rolling, >=5% of the cross-sectional area including both edge parts of the rear end part of a preceding material and the tip part of the succeeding material is preliminarily joined so that the max. gap between the end parts to be joined is <=5mm and rolling just after joining is executed using hot-rolling rolls having a relationship of Mt-Et>=100mum between the max. roll diameter (Mt) and the min. roll diameter (Et). Further, at the time, when rolling just after joining the sheet bars is executed at 35-60% draft, the adhesion by pressing wide materials are enabled and breaking is eliminated. In this way, even when they are sheet bars having high ratio of thickness to width, adhesion by pressing is enabled reducing the preliminarily joined area and the wide material is manufactured with a large rolling mill.

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、熱間圧延分野におい
て、鋼片(シートバー)を接合して連続化させる熱間圧
延材の接合のための圧延方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling method for joining hot-rolled materials for joining steel strips (sheet bars) to make them continuous in the field of hot rolling.

【0002】[0002]

【従来の技術】熱間圧延の連続化のための接合方法とし
ては、先行圧延材の後端部と後行圧延材の先端部を突き
合わせて圧接・接合する方法が知られている。この接合
方法として、特開昭61−144203号公報では幅方
向両端部を予接合した後に20%以上の圧下率で圧延
し、圧着する方法が提案されている。また、特開平5−
104107号公報では先行材と後行材の両端部を溶接
した後、圧延前後の板材クラウン比率を変えることによ
り圧着させる方法を提案している。
2. Description of the Related Art As a joining method for continuous hot rolling, a method is known in which the trailing end portion of the preceding rolled material and the leading end portion of the trailing rolled material are butted against each other and pressed and joined together. As this joining method, Japanese Patent Laid-Open No. 61-144203 proposes a method of pre-joining both end portions in the width direction, followed by rolling at a reduction rate of 20% or more and pressure bonding. In addition, JP-A-5-
Japanese Laid-Open Patent Publication No. 104107 proposes a method in which both ends of a preceding material and a following material are welded and then pressure-bonded by changing the crown ratio of the plate material before and after rolling.

【0003】[0003]

【発明が解決しようとする課題】しかし、いずれの場合
も、予備接合部が幅両縁部のみになるため、予備接合直
後の圧延もしくはその後の圧延時に破断することが多か
った。特に、幅広のシートバーの接合では、全断面積に
対する接合力が小さいために、連続圧延での張力に耐え
ることができなかった。
However, in any case, since the preliminary joining portion is only the both width edges, it often breaks during the rolling immediately after the preliminary joining or the subsequent rolling. In particular, in the joining of wide sheet bars, the joining force with respect to the entire cross-sectional area was small, so that it was not possible to withstand the tension in continuous rolling.

【0004】本発明の目的は、前記の問題を解決し、幅
広のシートバースラブの接合においても、圧延による破
断を起こさない製造方法を提供することにある。
An object of the present invention is to solve the above problems and to provide a manufacturing method which does not cause breakage due to rolling even when joining wide sheet slabs.

【0005】[0005]

【課題を解決するための手段】前記課題を解決するため
の本発明の要旨とするところは、連続仕上圧延前でバー
接合を行う熱延連続圧延において、接合端部の最大隙間
が5mm以下になるように、先行材の後端部と後行材の
先端部の両縁部を含め、断面積の5%以上を予備接合
し、接合直後の圧延を、鋼板圧延部位の最大ロール径
(Mt)と最小ロール径(Et)の間に、Mt−Et≧
100μmとなる関係をもつ熱間圧延ロールを用いて圧
延することを特徴とする接合鋼片の熱間圧延方法にあ
る。
The gist of the present invention for solving the above-mentioned problems is that in hot rolling continuous rolling in which bar joining is performed before continuous finishing rolling, the maximum gap at the joining end is 5 mm or less. As described above, 5% or more of the cross-sectional area is pre-joined including both the trailing edge of the preceding material and the leading edge of the trailing material, and rolling immediately after joining is performed by rolling the maximum roll diameter (Mt ) And the minimum roll diameter (Et), Mt-Et ≧
A hot rolling method for a joined steel slab is characterized by rolling using a hot rolling roll having a relationship of 100 μm.

【0006】この時、シートバーの接合直後の圧延を圧
下率35〜60%で行うとさらに接合が強固になる。
At this time, if the rolling of the sheet bar immediately after joining is carried out at a rolling reduction of 35 to 60%, the joining becomes stronger.

【0007】[0007]

【作用】本発明者らは、熱間で幅両縁部を接合された鋼
材を圧延するに当たり、シートバーの厚みが薄いほど、
また幅が広いほど接合後の圧延によって破断することに
気づいた。そこで、接合面積率を一定にして、厚幅比を
変化させて接合後の圧延実験を行ったところ、図1に示
すように厚幅比が大きくなるほど、接合強度が低下し、
破断に至ることが判明した。
When the present invention hot-rolls the steel material having both width edges joined, the thinner the sheet bar,
It was also noticed that the wider the width, the more likely it is to break by rolling after joining. Therefore, when a rolling experiment after joining was performed with the joining area ratio kept constant and the thickness-width ratio varied, the joining strength decreased as the thickness-width ratio increased, as shown in FIG.
It was found that it would break.

【0008】この破断面の観察を行ったところ、破断し
た材料は、予備接合以外の部分での接合が認められなか
った。そこで、別の実験によって先行材のテイルの伸び
代を測定したところ、厚幅比が大きくなるほど板幅中央
部の伸び代は小さくなり、未接合部分の接合が悪くなる
ことをつきとめた。そこで、本発明者らは、テイルの板
幅中央の伸び代を大きくする方法について鋭意検討を重
ねた。その結果、予備接合後の圧延ロールの形状を凸カ
ーブに変更することにより、伸び代が大きくなることが
わかった。有効な伸び代を得るための、ロールの凸度は
鋼板圧延部位の最大ロール径(Mt)と最小ロール径
(Et)の間に、Mt−Et≧100μmであり、これ
を本発明の構成要件の一つとした。
Observation of this fractured surface revealed that the fractured material was not joined in any part other than the preliminary joining. Then, when the elongation margin of the tail of the preceding material was measured by another experiment, it was found that the greater the thickness width ratio, the smaller the elongation margin at the central portion of the plate width and the poorer the joint at the unbonded portion. Therefore, the inventors of the present invention have made extensive studies on a method of increasing the expansion margin at the center of the plate width of the tail. As a result, it was found that by changing the shape of the rolling roll after the pre-bonding to a convex curve, the elongation margin was increased. The convexity of the roll for obtaining an effective elongation margin is Mt−Et ≧ 100 μm between the maximum roll diameter (Mt) and the minimum roll diameter (Et) of the steel sheet rolling portion, which is a constituent feature of the present invention. And one of them.

【0009】しかし、予備接合による幅両縁部の強度が
小さいと、この効果は起こらない。これは、両縁部に接
合する両鋼片への拘束力があることによってはじめて、
幅中央部の圧着が起こるためである。幅中央部にある未
接合部分の圧着面積を増加するためには、予備接合は両
縁の一点の溶接でなく、断面積の少なくとも5%以上の
予備溶接が必要である。これにより、板幅中央部を延伸
させ、中央部を中心に圧接させ、強固な結合状態を作る
ことができる。
However, this effect does not occur if the strength at both edges of the width due to the preliminary joining is small. This is because there is a binding force to both steel pieces that are joined to both edges,
This is because the central portion of the width is pressed. In order to increase the crimping area of the unbonded portion in the center of the width, pre-bonding does not require welding at one point on both edges but pre-welding of at least 5% or more of the cross-sectional area is required. As a result, the central portion of the plate width can be stretched and pressed against the central portion to form a strong bonded state.

【0010】また、この方法で中央部を圧着させるため
には、接合端部の隙間は、最大5mm以下に抑える必要
がある。これ以上では、圧着力が弱くなり接合強度の上
昇は望めなくなる。上述の効果を有効に発揮させる接合
の方法は、溶接面積が小さい方が有効な通電加熱法より
も、アーク溶接や、レーザー接合などの方法が効果的で
ある。
Further, in order to crimp the central portion by this method, the gap between the joint ends must be suppressed to 5 mm or less at the maximum. If the pressure is higher than this, the pressure bonding force becomes weak, and it is impossible to expect an increase in the bonding strength. As a joining method for effectively exhibiting the above-mentioned effects, a method such as arc welding or laser joining is more effective than an electric heating method in which a smaller welding area is more effective.

【0011】通常の約1m幅以内の材料の圧延では、こ
の方法によって問題なく圧延できる。しかし、板幅が広
くなってくると、幅両縁部の接合面積を十分取れなかっ
たり、幅中央部の板の延伸量が不十分なため、接合力が
小さく、破断する恐れがある。そのため前記構成要件に
加え、1パス目の圧下率を高くし、35%以上にするこ
とで接合力を高めることができる。
In the usual rolling of a material having a width of about 1 m or less, this method can be used for rolling without problems. However, as the plate width becomes wider, the joining area at both edges of the width cannot be sufficiently obtained, or the amount of stretching of the plate at the center of the width is insufficient, so the joining force is small and there is a risk of breakage. Therefore, in addition to the above-mentioned structural requirements, the bonding force can be increased by increasing the rolling reduction of the first pass to 35% or more.

【0012】なお、圧下率の上限を60%にしたのは、
広幅になるほど圧延負荷が高くなり、これ以上ではロー
ル破損の恐れがでてくるためである。
The upper limit of the rolling reduction is set to 60% because
This is because as the width becomes wider, the rolling load becomes higher, and if the width exceeds this range, there is a risk of roll damage.

【0013】[0013]

【実施例】7スタンドのタンデム圧延機を用いて、バー
接合の実験を行った。これを表1に示す。No.1から
4は、厚幅比、接合直後圧延圧下率、ロール凸度を同一
にして、接合部の端部形状と接合方法を変えたテストを
行った。端部形状が隙間5mmをこえるNo.1,2
は、接合方法に関わらず圧延時に破断が起こった。これ
をフラットにするとアーク溶接では接合速度が遅いため
に、予備接合率が低く、圧延直後の温度も低下したが、
本発明範囲を保っているために、圧延時の破断は起こら
なかった。
Example A bar joining experiment was conducted using a 7-stand tandem rolling mill. This is shown in Table 1. No. For Nos. 1 to 4, the thickness ratio, the rolling reduction immediately after joining, and the roll convexity were made the same, and the tests were carried out by changing the end shape of the joined portion and the joining method. No. whose end shape exceeds a gap of 5 mm 1,2
Fracture occurred during rolling regardless of the joining method. If this is made flat, the welding speed in arc welding is slow, so the pre-bonding rate is low and the temperature immediately after rolling is also reduced.
Since the range of the present invention was maintained, no breakage occurred during rolling.

【0014】No.7は、厚幅比が大きくなり、圧下率
が30%と小さいために幅両縁部の拘束力が弱く、また
No.8はロール凸度が50μmと小さいために幅中央
部の延伸が小さく、いずれも破断した。その他の例で
は、いずれも本発明範囲内であり、圧延による破断は起
こらなかった。
No. In No. 7, since the thickness width ratio is large and the rolling reduction is as small as 30%, the binding force at both width edges is weak, and No. In Roll No. 8, the roll convexity was as small as 50 μm, so the stretching in the width center portion was small, and all were broken. In all the other examples, all were within the scope of the present invention, and fracture due to rolling did not occur.

【0015】[0015]

【表1】 [Table 1]

【0016】[0016]

【発明の効果】以上のように、本発明によれば、厚幅比
の大きなシートバーでも予備接合面積を少なくして圧接
することが可能であり、大型圧延機によって幅広材を製
造することも可能となる。
As described above, according to the present invention, even a sheet bar having a large thickness / width ratio can be pressure-welded with a small pre-bonding area, and a wide material can be manufactured by a large rolling mill. It will be possible.

【図面の簡単な説明】[Brief description of drawings]

【図1】厚幅比による接合強度変化(破断限界)を示し
た図である。
FIG. 1 is a diagram showing a change in bonding strength (breaking limit) depending on a thickness width ratio.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 連続仕上圧延前でバー接合を行う熱延連
続圧延において、接合端部の最大隙間が5mm以下にな
るように、先行材の後端部と後行材の先端部の両縁部を
含め、断面積の5%以上を予備接合し、接合直後の圧延
を、鋼板圧延部位の最大ロール径(Mt)と最小ロール
径(Et)の間に、Mt−Et≧100μmとなる関係
をもつ熱間圧延ロールを用いて圧延することを特徴とす
る接合鋼片の熱間圧延方法。
1. In hot rolling continuous rolling in which bar joining is performed before continuous finishing rolling, both edges of the trailing edge of the preceding material and the leading edge of the following material are set so that the maximum gap between the joining edges is 5 mm or less. 5% or more of the cross-sectional area including the portion is preliminarily joined, and the rolling immediately after joining is performed such that Mt-Et ≧ 100 μm between the maximum roll diameter (Mt) and the minimum roll diameter (Et) of the steel sheet rolling portion. A method for hot-rolling a joined steel slab, which comprises rolling using a hot-rolling roll having a groove.
【請求項2】 接合鋼片の圧延を圧下率35〜60%で
行う請求項1記載の接合鋼片の熱間圧延方法。
2. The hot rolling method for joining steel pieces according to claim 1, wherein the joining steel pieces are rolled at a rolling reduction of 35 to 60%.
JP11159894A 1994-05-25 1994-05-25 Method for hot-rolling joined slab Pending JPH07314006A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11159894A JPH07314006A (en) 1994-05-25 1994-05-25 Method for hot-rolling joined slab

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11159894A JPH07314006A (en) 1994-05-25 1994-05-25 Method for hot-rolling joined slab

Publications (1)

Publication Number Publication Date
JPH07314006A true JPH07314006A (en) 1995-12-05

Family

ID=14565421

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11159894A Pending JPH07314006A (en) 1994-05-25 1994-05-25 Method for hot-rolling joined slab

Country Status (1)

Country Link
JP (1) JPH07314006A (en)

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