JPH02274816A - Method for heating steel slab - Google Patents
Method for heating steel slabInfo
- Publication number
- JPH02274816A JPH02274816A JP9684389A JP9684389A JPH02274816A JP H02274816 A JPH02274816 A JP H02274816A JP 9684389 A JP9684389 A JP 9684389A JP 9684389 A JP9684389 A JP 9684389A JP H02274816 A JPH02274816 A JP H02274816A
- Authority
- JP
- Japan
- Prior art keywords
- heating
- steel billet
- steel
- present
- burner
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、鋼片の加熱方法に係り、特に鉛快削鋼やステ
ンレス鋼等の圧延中に発生する頭割れ防止に有効な鋼片
の加熱方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of heating a steel billet, and in particular to a method of heating a steel billet, which is effective for preventing head cracking that occurs during rolling of lead free-cutting steel, stainless steel, etc. Concerning heating method.
［従来の技術］
鉛快削鋼やステンレス鋼等は、圧延中にいわゆる頭割れ
が発生することが多い。従来、これを防止するため圧延
に先立ち、加熱炉内で、鋼片全長の加熱温度を普通材よ
り高くしていた。[Prior Art] In lead free-cutting steel, stainless steel, etc., so-called head cracking often occurs during rolling. Conventionally, in order to prevent this, the heating temperature of the entire length of the steel billet was set higher than that of ordinary material in a heating furnace prior to rolling.
［発明が解決しようとする課題］
しかし、鋼片の全長にわたって加熱温度を高くすること
は、燃料原単位の上昇を招く。さりとて、特に鋼片の先
端部を十分に加熱しておかないと、圧延時において、ミ
スロールを生じ、生産歩留りの低下を招き、また頭割れ
を生じたか否かを確認しながら圧延しなければならず、
圧延の時間間隔をもたせることによる操業能率が低下す
る。[Problems to be Solved by the Invention] However, increasing the heating temperature over the entire length of the steel billet results in an increase in the fuel consumption rate. If the tip of the billet, in particular, is not sufficiently heated, misrolls will occur during rolling, leading to a decrease in production yield, and rolling must be done while checking to see if cracks have occurred. figure,
Operational efficiency decreases due to the rolling time interval.
そこで本発明の主目的は、圧延工程での頭割れを防止で
き、しかも燃料原単位、歩留りおよび操業性が良好とな
る鋼片の加熱方法を提供することにある。SUMMARY OF THE INVENTION Therefore, the main object of the present invention is to provide a method for heating a steel billet that can prevent cracking during the rolling process and improve fuel consumption, yield, and operability.
［課題を解決するための手段］
上記課題を解決するための本発明は、装入口から抽出口
へ向かう方向と直交する状態で鋼片が搬送される加熱炉
において、加熱炉の側壁部に設けた加熱バーナーにより
、鋼片の圧延に際して先頭となる長手方向端部を加熱す
ることを特徴とするものである。[Means for Solving the Problems] The present invention for solving the above problems provides a heating furnace in which a steel billet is conveyed in a direction perpendicular to a direction from a charging port to an extraction port. The heating burner is used to heat the leading longitudinal end of the steel billet during rolling.
すなわち、第６図により説明すると、頭割れ発生の虞れ
のある鋼片に“ついては、従来法（ｂｌにおいて、普通
材（ａ）に比較して、鋼片の全長（先端〜後端）にわた
って加熱温度を例えばΔｔだけ高くする。これに対して
本発明では、鋼片先端部のみをΔｔだけ高くすることで
、加熱に要する燃料原単位を低減しようとするものであ
る。In other words, to explain with reference to Fig. 6, in the conventional method (bl), the entire length of the steel slab (from the tip to the rear end) is The heating temperature is increased, for example, by Δt.On the other hand, the present invention attempts to reduce the fuel consumption required for heating by increasing only the tip of the steel billet by Δt.
［作 用］
鋼片の両端部は、他の部分に比較して冷却され易く、こ
の温度降下が大きいとき、特に鉛快削鋼やステンレス鋼
からなる鋼片であるとき、圧延工程で、鋼片の先端部で
頭割れが発生する。[Function] Both ends of a steel billet are easily cooled compared to other parts, and when this temperature drop is large, especially when the billet is made of lead free-cutting steel or stainless steel, the steel billet cools down during the rolling process. A crack occurs at the tip of the piece.
そこで、本発明に従って、加熱炉抽出口付近の側壁から
加熱バーナーにより、鋼片の先頭部のみを加熱すれば、
頭割れ防止を図ることができるとともに、鋼片の全長に
わたって加熱することを要しないので、従来法に比較し
て燃料原単位を低減できる。Therefore, according to the present invention, if only the leading end of the steel billet is heated with a heating burner from the side wall near the heating furnace extraction port,
In addition to being able to prevent head cracking, it is not necessary to heat the entire length of the steel billet, so fuel consumption can be reduced compared to conventional methods.
［発明の具体的構成］ 以下本発明を図面によりさらに具体的に説明する。[Specific structure of the invention] The present invention will be explained in more detail below with reference to the drawings.
第１図において、ｌはウオーキング・ビーム式加熱炉で
、その装入口ＩＡから装入した鋼片２を、図示しないウ
オーキング・ビーム上に乗せて、矢印方向に移動させる
過程で所定温度に加熱される。In Fig. 1, l denotes a walking beam type heating furnace, in which a steel billet 2 charged from the charging port IA is placed on a walking beam (not shown) and heated to a predetermined temperature while being moved in the direction of the arrow. Ru.
かくして、所定の温度まで加熱した鋼片２に対して、本
発明では、抽出口１０の付近の側壁ｌＣに取り付けた加
熱バーナ４．４゛により、鋼片２の、圧延時において先
頭面となる先端面２ａに対して急速加熱を行う。先端面
２ａが急速加熱された鋼片２は次いで抽出用ローラ３上
に乗せられ、抽出口ＩＢから抽出され、圧延工程に供さ
れる。Thus, in the present invention, the steel billet 2 heated to a predetermined temperature is heated by the heating burner 4.4' attached to the side wall LC near the extraction port 10 to heat the steel billet 2, which becomes the leading surface during rolling. Rapid heating is performed on the tip surface 2a. The steel piece 2 whose tip end surface 2a has been rapidly heated is then placed on the extraction roller 3, extracted from the extraction port IB, and subjected to a rolling process.
上記バーナ４には、配管５から燃焼用空気５０が、配管
６から燃料噴霧化用スチーム６０が、また配管７からは
燃料７０がそれぞれ供給され、燃焼される（バーナ４′
も同様であるが、図では省略しである）。The burner 4 is supplied with combustion air 50 from a pipe 5, fuel atomizing steam 60 from a pipe 6, and fuel 70 from a pipe 7, and is combusted (burner 4'
is similar, but is omitted in the figure).
配管５は、手動調整弁５１、オンオフ弁５２、短炎・長
炎切換弁５３を備えており、ここで、オンオフ弁５２は
鋼片２のトラッキング信号により、当該加熱バーナー４
と対応した位置に到達した時点で加熱バーナー４が作動
するようにし、また短炎・長炎切換弁５３は、鋼片２の
トラッキング信号により、鋼片２の長さ、すなわち鋼片
２の先端面２ａと側壁との離間距離に応じて、燃焼炎の
長さを切り換えるようにするものである。The piping 5 includes a manual adjustment valve 51, an on-off valve 52, and a short flame/long flame switching valve 53.
When the heating burner 4 reaches the position corresponding to The length of the combustion flame is changed according to the distance between the surface 2a and the side wall.
配管６．７にも、手動調整弁６１．７１およびオンオフ
弁６２．７２が取り付けられている。A manual regulating valve 61.71 and an on/off valve 62.72 are also attached to the pipe 6.7.
上記バーナ４の具体例としては、例えば第２図および第
３図に示したものを使用できる。燃料７０およびスチー
ム６０は、混合器８により混合された後、導管９の先端
から混合室ｌＯへと吹き出される。As a specific example of the burner 4, those shown in FIGS. 2 and 3 can be used, for example. After the fuel 70 and the steam 60 are mixed by the mixer 8, they are blown out from the tip of the conduit 9 into the mixing chamber IO.
一方、この例では、燃焼用空気５０が、−次空気５０Ａ
と二次空気５０Ｂとに分けられており、それぞれ−次空
気導入口５４Ａおよび二次空気導入口５４Ｂからバーナ
４内に導入されるようになっている。On the other hand, in this example, the combustion air 50 is
and secondary air 50B, which are introduced into the burner 4 through a secondary air inlet 54A and a secondary air inlet 54B, respectively.
−次空気５０Ａは、−次空気導管ｌｌ内に導入され、旋
回羽根１２によって乱流化された後、前記混合部ｌＯへ
吹き出される。また二次空気５０Ｂは二次空気導管１３
を通じて一部閉塞された環状路１４から吹き出される。The secondary air 50A is introduced into the secondary air conduit ll, made turbulent by the swirl vane 12, and then blown out to the mixing section IO. Further, the secondary air 50B is supplied to the secondary air conduit 13
The air is blown out from the partially closed annular passage 14 through the air.
混合室１０では一次空気５０Ａにより、噴霧化された燃
料７０が効率的に燃焼され、加熱炉ｌ内に火炎１５が形
成される。また二次空気５０Ｂは環状路１４から吹き出
され、火炎１５の周囲に２次空気の流れ１６を形成する
。上記例において、−次空気５０Ａ量／二次空気量比を
変えることにより、火炎の長さを調節することができる
。In the mixing chamber 10, the atomized fuel 70 is efficiently combusted by the primary air 50A, and a flame 15 is formed in the heating furnace 1. Further, the secondary air 50B is blown out from the annular passage 14 to form a secondary air flow 16 around the flame 15. In the above example, the length of the flame can be adjusted by changing the secondary air 50A amount/secondary air amount ratio.
本発明におけるバーナによる鋼片先端面の加熱温度は、
鋼片中央部の平均温度に比して、５０〜１００℃、すな
わち、５％程度高めにするのがよい。The heating temperature of the tip surface of the steel billet by the burner in the present invention is:
It is preferable that the temperature is 50 to 100°C, that is, about 5% higher than the average temperature at the center of the steel piece.
また加熱バーナの本数は、１本でもよいが複数本設けて
もよい。Further, the number of heating burners may be one, but a plurality of heating burners may be provided.
他方、本発明者らは、第４図に示す鋼片測温位ＩｆＡＳ
Ｂ （位置Ａは先端面から２０ｍｍから離間した面にお
ける中心、位ｆｆ１Ｂはその面の端を示す）を目標温度
とするための鋼片加熱時間を調べたところ、第５図に示
す結果が得られた。すなわち、この加熱時間は、バーナ
ーと鋼片先端部との間の離間距離に依存し、この離間距
離が大きい程、加熱時間を長（とる必要がある。また上
記位置Δ、Ｂに対応したグラフ（Ａ）、（Ｂ）に見られ
るように、鋼片先端部の中心部を目標温度にするために
は、加熱時間を長くしなければならないことが判った。On the other hand, the present inventors have developed the temperature measurement potential IfAS shown in FIG.
When we investigated the heating time of the steel slab to achieve the target temperature at B (position A is the center of the plane 20 mm away from the tip surface, and position ff1B indicates the edge of that plane), we obtained the results shown in Figure 5. It was done. That is, this heating time depends on the distance between the burner and the tip of the steel billet, and the larger the distance, the longer the heating time (need to be). As seen in (A) and (B), it was found that the heating time had to be increased in order to bring the center of the tip of the billet to the target temperature.
［実施例］ 次に実施例により本発明の効果を明らかにする。[Example] Next, the effects of the present invention will be clarified through examples.
生産量５００００１／月の工場に本発明を適用したとこ
ろ、従来法との比較の下で、第１表の結果を得た。When the present invention was applied to a factory with a production volume of 500,001/month, the results shown in Table 1 were obtained in comparison with the conventional method.
第 １ 表
び操業性が良好となる鋼片の加熱方法を提供することが
できる。1. It is possible to provide a method for heating a steel billet that provides good surface appearance and operability.
第１図は本発明法を実施するための加熱炉の平面図、第
２図は加熱バーナー例の縦断面図、第３図はそのｌｌｌ
−■線矢視図、第４図は鋼片の測温位置を示す図、第５
図は鋼片の加熱時間を示すグラフ、第６図は本発明の加
熱方法を従来法等と比較して示すグラフで、（ａ）は普
通材、（ｂ）は従来法、（Ｃ１は本発明法を示す。
■・・・ウオーキングビーム式加熱炉、２・・・鋼片、
４．４′・・・加熱バーナー、５．６．７・・・配管、
５０・・・燃焼用空気、５０Ａ・・・−次空気、５０Ｂ
・・・二次空気、６０・・・燃料噴霧化用スチーム、７
０・・・燃料、５１．６１．７１・・・手動調整弁、５
２．６２．７２・・・オンオフ弁、５３・・・短炎・長
炎切換弁。
［発明の効果］
以上の通り、本発明によれば、圧延工程での頭割れを防
止でき、しかも燃料原単位、歩留りおよ第１図
第４図
ヅ
第５図
コＵ
ｂＵ（○
バーナー 〜＠キ夫ｊ艷Ｊ２−距亀
（α）
第
図
（ｂ）
（Ｃ１Fig. 1 is a plan view of a heating furnace for carrying out the method of the present invention, Fig. 2 is a longitudinal cross-sectional view of an example of a heating burner, and Fig. 3 is its lll.
-■ Line arrow view, Figure 4 is a diagram showing the temperature measurement position of the steel piece, Figure 5
The figure is a graph showing the heating time of a steel billet, and Figure 6 is a graph showing a comparison of the heating method of the present invention with the conventional method, etc. (a) is a normal material, (b) is a conventional method, (C1 is a graph of the present invention). The invention method is shown.■...Walking beam heating furnace, 2...Steel billet,
4.4'... Heating burner, 5.6.7... Piping,
50...Combustion air, 50A...-Next air, 50B
...Secondary air, 60...Steam for fuel atomization, 7
0...Fuel, 51.61.71...Manual adjustment valve, 5
2.62.72...On-off valve, 53...Short flame/long flame switching valve. [Effects of the Invention] As described above, according to the present invention, head cracking in the rolling process can be prevented, and the fuel consumption rate, yield, and ＠Kio J艷J2-Takame (α) Figure (b) (C1
Claims (1)
鋼片が搬送される加熱炉において、加熱炉の側壁部に設
けた加熱バーナーにより、鋼片の圧延に際して先頭とな
る長手方向端部を加熱することを特徴とする鋼片の加熱
方法。(1) In a heating furnace where the steel billets are conveyed in a direction perpendicular to the direction from the charging port to the extraction port, the heating burner installed on the side wall of the heating furnace is used to roll the steel billets at the leading end in the longitudinal direction. A method of heating a steel billet, characterized by heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9684389A JPH02274816A (en) | 1989-04-17 | 1989-04-17 | Method for heating steel slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9684389A JPH02274816A (en) | 1989-04-17 | 1989-04-17 | Method for heating steel slab |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02274816A true JPH02274816A (en) | 1990-11-09 |
Family
ID=14175795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9684389A Pending JPH02274816A (en) | 1989-04-17 | 1989-04-17 | Method for heating steel slab |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02274816A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0413655U (en) * | 1990-05-26 | 1992-02-04 | ||
| JP2011115851A (en) * | 2009-11-04 | 2011-06-16 | Jfe Steel Corp | Method of manufacturing seamless steel pipe |
-
1989
- 1989-04-17 JP JP9684389A patent/JPH02274816A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0413655U (en) * | 1990-05-26 | 1992-02-04 | ||
| JP2011115851A (en) * | 2009-11-04 | 2011-06-16 | Jfe Steel Corp | Method of manufacturing seamless steel pipe |
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