JP2755082B2 - Manufacturing method of hot rolled steel sheet - Google Patents
Manufacturing method of hot rolled steel sheetInfo
- Publication number
- JP2755082B2 JP2755082B2 JP4346807A JP34680792A JP2755082B2 JP 2755082 B2 JP2755082 B2 JP 2755082B2 JP 4346807 A JP4346807 A JP 4346807A JP 34680792 A JP34680792 A JP 34680792A JP 2755082 B2 JP2755082 B2 JP 2755082B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- rolled steel
- hot
- scale
- rolling mill
- 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.)
- Expired - Fee Related
Links
Landscapes
- Control Of Metal Rolling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、密着性がよくかつ厚
さの薄いスケールを発生させる熱延鋼板の製造方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hot-rolled steel sheet which produces a scale having good adhesion and a small thickness.
【０００２】[0002]
【従来の技術】熱延鋼板表面に発生するスケールの付着
量が極めて少ない熱延鋼板の製造方法としては、特公平
４−３１７６２号公報に開示された技術がある。この技
術に基づく熱延鋼板の製造方法は、図３に示すように、
仕上圧延機２１から出た直後の熱延鋼板２２を、仕上圧
延機２１の後方に設けた複数のスプレーノズル２３を使
用し、２００℃／ｓｅｃ以上の冷却速度で５００℃以下
まで急冷する方法である。2. Description of the Related Art A method disclosed in Japanese Patent Publication No. 4-31762 is a method for producing a hot-rolled steel sheet in which the amount of scale generated on the surface of the hot-rolled steel sheet is extremely small. As shown in FIG. 3, a method for manufacturing a hot-rolled steel sheet based on this technique is as follows.
The hot-rolled steel sheet 22 immediately after exiting the finishing mill 21 is rapidly cooled to 500 ° C. or lower at a cooling rate of 200 ° C./sec or more using a plurality of spray nozzles 23 provided behind the finishing mill 21. is there.
【０００３】[0003]
【発明が解決しようとする課題】特公平４−３１７６２
号は熱延板表面スケールを低減させるために イ）鋼板表面に生成するウスタイトがマグネタイトに変
態する（約５００℃）とスケールが殆ど成長しない。 ロ) 仕上圧延機出側から５００℃以下までの時間に比例
してスケールが厚くなる。 を利用したもので、スケールの絶対量を抑制しようとい
う考え方である。[Problems to be Solved by the Invention]
In order to reduce the scale of the hot-rolled sheet surface, a) When the wustite formed on the surface of the steel sheet is transformed into magnetite (about 500 ° C.), the scale hardly grows. B) The scale becomes thicker in proportion to the time from the finish rolling mill exit side to 500 ° C. or less. The idea is to control the absolute amount of scale.
【０００４】しかしながら、５００℃以下まで急冷させ
ることにより、変態強化により強度が高すぎる鋼板がで
きたり、低温巻取りのため、コイルの巻取り形状が不良
となるという問題点があった。本発明はスケール剥離を
防止すると同時に、上記問題点を解決する熱延鋼板の製
造方法を提供することを目的としている。[0004] However, there has been a problem that a steel sheet having too high strength can be formed by transformation strengthening by rapidly cooling to 500 ° C or lower, or a coil winding shape becomes poor due to low temperature winding. An object of the present invention is to provide a method for manufacturing a hot-rolled steel sheet which prevents scale exfoliation and solves the above problems.
【０００５】[0005]
【課題を解決するための手段】本発明はマグネタイトの
密着性が図２に示すように良好であり、スケール剥離
は、そのスケールの大部分がマグネタイトより構成され
ている場合、厚みが若干あっても問題ないことに着目し
たものである。According to the present invention, the adhesion of magnetite is good as shown in FIG. 2, and the scale exfoliation has a slight thickness when the majority of the scale is composed of magnetite. It is noted that there is no problem.
【０００６】スケールの厚さ、構成要素とスケール剥離
との関係を種々実験により検討した結果、複数の圧延機
を用いて熱間仕上圧延を行うに際し、最終圧延機前の圧
延機群により通常の熱延鋼板の場合と同様に加工性の観
点からＡｒ 3 点以上の温度で圧延し、最終圧延機直前の
圧延機と最終圧延機の間で被圧延鋼板を６００℃以下に
なるように水冷し、最終圧延機により被圧延鋼板の水切
りを行えば著しく低温に過冷されることがなくなり、ス
ケールを大部分マグネタイトで形成でき、スケール剥離
による問題が生じないこと、及びその後５５０℃以上の
範囲で巻き取れば、マグネタイトへの変態が進行し、ス
ケールの密着性が良くなることを把握した。又、５５０
℃以上の範囲で巻取りを行った場合、材質上の問題点、
コイル巻取形状の不良は解決されることについても確認
した。[0006] As a result of examining the relationship between the thickness of the scale, the components and the scale peeling by various experiments, it was found that a plurality of rolling mills were used.
When performing hot finish rolling using
Depending on the group of rolling machines, the view of workability is the same as for ordinary hot-rolled steel sheets.
Rolling at a temperature of at least Ar 3 points from the point
Reduce the temperature of the rolled steel sheet between the rolling mill and the final rolling mill to 600 ° C or less.
Water-cooled so that the final rolling mill
Ri no longer be subcooled to significantly low temperature by performing the scale can the formation in most magnetite, it does not cause problems due to scale peeling, and then if taken up at a range of above 550 ° C., transformation to magnetite It progressed, and it was understood that the adhesion of the scale was improved. 550
If winding is performed in the temperature range above ℃,
It was also confirmed that the defect of the coil winding shape could be solved.
【０００７】この発明に係る熱延鋼板の製造方法のポイ
ントは、仕上圧延機の最終圧延機前の圧延機群により仕
上圧延を終了させ、最終圧延機直前の圧延機と最終圧延
機の間で被圧延鋼板を６００℃以下にまで水冷により急
冷し、最終圧延機により被圧延鋼板の水切りを行った
後、５５０℃以上の温度範囲で巻き取るものである。[0007] In the method of manufacturing a hot-rolled steel sheet according to the present invention,
Cement, specification by the final rolling mill previous mill group of finish rolling mill
Finish the upper rolling, the rolling mill just before the final rolling mill and the final rolling
The steel plate to be rolled was rapidly cooled by water cooling to 600 ° C or lower between the mills, and the steel plate to be rolled was drained by the final rolling mill.
Then, it is wound up in a temperature range of 550 ° C. or more .
【０００８】[0008]
【作用】 本発明によれば、最終圧延機直前の圧延機と
最終圧延機の間で被圧延鋼板を６００℃以下に水冷によ
り急冷し、最終圧延機により被圧延鋼板の水切りを行
い、さらに５５０℃以上で巻取ることにより、著しく低
温に冷却されることがなくなり、スケールを大部分マグ
ネタイトで形成でき、その厚さもスケール剥離が問題と
ならない程度に抑制できる。According to the present invention, the rolling mill immediately before the final rolling mill
The steel plate to be rolled is cooled to 600 ° C or lower by water cooling between the final rolling mills .
Ri quenched, line draining of the rolled steel sheet by the final rolling mill
There, by winding an additional 550 ° C. or higher, significantly lower
No longer be cooled to the temperature, the scale can be formed in most magnetite, it can be suppressed to the extent that its thickness and scale peeling is not a problem.
【０００９】そして、圧延された熱延鋼板は、５５０℃
以上の温度で巻き取られるので、５００℃未満の低温巻
取りの場合とは異なり材質上の問題もなく、またコイル
の巻取り形状が悪化することもない。The rolled hot-rolled steel sheet is 550 ° C.
Since the coil is wound at the above temperature, unlike the case of low-temperature coiling at less than 500 ° C., there is no problem in the material and the coil winding shape does not deteriorate.
【００１０】[0010]
【実施例】 本発明の１実施例の熱延鋼板の製造方法
を、図１に基づき説明する。本製造方法においては、仕
上圧延機が７スタンド（圧延機）で構成され、最終スタ
ンドである第７スタンド１ａをダミースタンド、すなわ
ち圧延を行わないスタンドとし、第６スタンド１ｂと第
７スタンド１ａの間に吐出圧力４０ｋｇ／ｃｍ2程度の
スプレーノズル３を複数設け、熱延鋼板２を６００℃以
下に急冷する。この場合、冷却水が第７スタンド１ａの
下流側に流れて、熱延鋼板２が必要以上に冷却されない
ように、第７スタンド１ａのロールを熱延鋼板２に接触
させて、水切りする必要がある。図示していないが、第
７スタンド１ａの下流側には温度計を配置し、熱延鋼板
２の表面温度を測定し、その温度に対応して冷却水の吐
出量を制御して、熱延鋼板２の表面温度を５５０℃以上
の範囲に保持するようにしている。EXAMPLE A method for manufacturing a hot-rolled steel sheet according to an example of the present invention will be described with reference to FIG. In this manufacturing method, finishing mill is composed of 7 stands (mill), the final Star
Dummy stand the seventh stand 1a is a command, Sunawa
And stand not performed Chi rolling, a plurality of discharge pressure 40 kg / cm 2 about the spray nozzle 3 between the sixth stand 1b and the seventh stand 1a, the hot-rolled steel sheet 2 600 ° C. or more
Quenched below. In this case, the roll of the seventh stand 1a needs to be brought into contact with the hot-rolled steel sheet 2 and drained so that the cooling water flows downstream of the seventh stand 1a and the hot-rolled steel sheet 2 is not cooled more than necessary. There is . Although not shown, a thermometer is arranged on the downstream side of the seventh stand 1a to measure the surface temperature of the hot-rolled steel sheet 2 and to control the discharge amount of the cooling water in accordance with the temperature. The surface temperature of the steel sheet 2 is kept within a range of 550 ° C. or more .
【００１１】この温度範囲に熱延鋼板２の表面温度を保
持すると、スケールとしてウスタイト（ＦｅＯ）が２、
マグネタイト（Ｆｅ3Ｏ4）が９３、ヘマタイト（Ｆｅ2
Ｏ3）が５の割合で生成される。このうち多く生成され
るマグネタイトは、厚さがもっとも薄い。薄いスケール
は密着性がよいことが定性的に知られているが、実際密
着力を測定してみると、図２のグラフに示すように、マ
グネタイトの密着力はウスタイトの１０倍、ヘマタイト
の４倍もあり、本発明に基づき製造された熱延鋼板はス
ケールが剥離しにくく、かつ歩留もよいことが分かる。When the surface temperature of the hot-rolled steel sheet 2 is maintained in this temperature range, wustite (FeO) is 2 as a scale.
93 magnetite (Fe 3 O 4 ) and hematite (Fe 2
O 3 ) is produced in a proportion of 5. Of these, magnetite, which is generated most, has the thinnest thickness. It is qualitatively known that a thin scale has good adhesion. However, when the actual adhesion is measured, as shown in the graph of FIG. 2, the adhesion of magnetite is 10 times that of wustite and 4 times that of hematite. It can be seen that the scale of the hot-rolled steel sheet manufactured according to the present invention is not easily peeled off and the yield is good.
【００１２】[0012]
【発明の効果】この発明により、スケールが剥離しにく
く、かつ歩留もよい熱延鋼板を製造することができる。According to the present invention, it is possible to manufacture a hot-rolled steel sheet in which the scale is hardly peeled off and the yield is good.
【図１】本発明の１実施例の熱延鋼板の製造方法を示す
説明図である。FIG. 1 is an explanatory view showing a method for manufacturing a hot-rolled steel sheet according to one embodiment of the present invention.
【図２】スケールの密着力を示すグラフである。FIG. 2 is a graph showing the adhesion of a scale.
【図３】従来の熱延鋼板の製造方法を示す説明図であ
る。FIG. 3 is an explanatory view showing a conventional method for manufacturing a hot-rolled steel sheet.
１ａ 仕上圧延機の第７スタンド １ｂ 仕上圧延機の第６スタンド ２ 熱延鋼板 ３ スプレーノズル 1a 7th stand of finishing mill 1b 6th stand of finishing mill 2 hot rolled steel plate 3 spray nozzle
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭61−195702（ＪＰ，Ａ) 特開 昭50−59251（ＪＰ，Ａ) 特開 平４−197510（ＪＰ，Ａ) 特開 昭62−289314（ＪＰ，Ａ) 特公 昭53−24178（ＪＰ，Ｂ２) 特公 昭63−27089（ＪＰ，Ｂ２) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-195702 (JP, A) JP-A-50-59251 (JP, A) JP-A-4-197510 (JP, A) JP-A 62-195 289314 (JP, A) JP-B 53-24178 (JP, B2) JP-B 63-27089 (JP, B2)
Claims (1)
うに際し、最終圧延機前の圧延機群によりＡｒ3点以上
の温度で圧延し、最終圧延機直前の圧延機と最終圧延機
の間で被圧延鋼板を６００℃以下になるように水冷し、
前記最終圧延機により前記被圧延鋼板の水切りを行った
後、５５０℃以上の温度範囲で巻き取ることを特徴とす
る熱延鋼板の製造方法。1. A hot finish rolling using a plurality of rolling mills .
At the time of rolling, Ar 3 points or more depending on the rolling mill group before the last rolling mill
Rolling at the temperature of the last rolling mill and the last rolling mill
The steel plate to be rolled is water cooled so as to be 600 ° C. or less ,
The final rolling mill was used to drain the steel plate to be rolled.
Thereafter, winding is performed in a temperature range of 550 ° C. or higher .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4346807A JP2755082B2 (en) | 1992-12-25 | 1992-12-25 | Manufacturing method of hot rolled steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4346807A JP2755082B2 (en) | 1992-12-25 | 1992-12-25 | Manufacturing method of hot rolled steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06190426A JPH06190426A (en) | 1994-07-12 |
| JP2755082B2 true JP2755082B2 (en) | 1998-05-20 |
Family
ID=18385945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4346807A Expired - Fee Related JP2755082B2 (en) | 1992-12-25 | 1992-12-25 | Manufacturing method of hot rolled steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2755082B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5463888B2 (en) * | 2009-12-09 | 2014-04-09 | 新日鐵住金株式会社 | Manufacturing method and manufacturing apparatus for hot-rolled steel sheet |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5059251A (en) * | 1973-09-26 | 1975-05-22 | ||
| JPS604722B2 (en) * | 1976-08-18 | 1985-02-06 | 株式会社興人 | Exhaust smoke purification method and device |
| JPS61195702A (en) * | 1985-02-26 | 1986-08-30 | Sumitomo Metal Ind Ltd | Rolling method for hot rolled steel sheet |
| JPS62289314A (en) * | 1986-06-06 | 1987-12-16 | Kawasaki Steel Corp | Manufacture of hot rolled strip steel having good scale adhesion |
| US4740987A (en) * | 1986-06-30 | 1988-04-26 | American Telephone And Telegraph Company, At&T Bell Laboratories | Distributed-feedback laser having enhanced mode selectivity |
| JPH04197510A (en) * | 1990-11-28 | 1992-07-17 | Nkk Corp | Optimal finishing temperature control method for hot rolling mill |
-
1992
- 1992-12-25 JP JP4346807A patent/JP2755082B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06190426A (en) | 1994-07-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |