JPH069707B2 - Descaling method for continuously cast steel billets - Google Patents
Descaling method for continuously cast steel billetsInfo
- Publication number
- JPH069707B2 JPH069707B2 JP63271048A JP27104888A JPH069707B2 JP H069707 B2 JPH069707 B2 JP H069707B2 JP 63271048 A JP63271048 A JP 63271048A JP 27104888 A JP27104888 A JP 27104888A JP H069707 B2 JPH069707 B2 JP H069707B2
- Authority
- JP
- Japan
- Prior art keywords
- scale
- steel
- descaling
- layer
- continuous casting
- 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 - Lifetime
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
- B21B45/04—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 for de-scaling, e.g. by brushing
- B21B45/08—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 for de-scaling, e.g. by brushing hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- 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)
- Metal Rolling (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は鋼片特に連続鋳造鋼片表面のスケールを除去す
る方法に関するものである。TECHNICAL FIELD The present invention relates to a method for removing scale on the surface of a steel billet, particularly a continuously cast steel billet.
従来連続鋳造設備で製造される鋼材は、連続鋳造設備の
機端を経てから、加熱炉まで搬送される際デスケーリン
グ工程は有さず、加熱炉から熱間圧延ラインの熱間圧延
機までの工程で、加熱炉における加熱酸化によるスケー
ルを除去するデスケーリング工程と、圧延中の鋼材の空
気酸化によるスケールを除去するデスケーリング工程を
設けている。上記のようなスケールは完全に除去して圧
延しないと、スケールが圧延時に鋼材表面に押し込まれ
て製品のスケール疵となったり、強制冷却時にスケール
が残存していると、スケール残留部と剥離部との冷却能
の差により、鋼材温度が板内で不均一になり平坦度不良
が発生し、製品スペックを満足しないという問題が生じ
る。Conventionally, steel products produced in continuous casting equipment do not have a descaling process when they are conveyed to the heating furnace after passing through the end of the continuous casting equipment, and from the heating furnace to the hot rolling mill of the hot rolling line. In the process, there are provided a descaling process for removing scale due to thermal oxidation in a heating furnace and a descaling process for removing scale due to air oxidation of steel material during rolling. If the scale as described above is not completely removed and rolled, the scale will be pushed into the steel surface during rolling to cause scale flaws in the product, or if the scale remains during forced cooling, the scale residual part and the peeling part Due to the difference in cooling capacity between the steel sheet and the steel sheet, the temperature of the steel material becomes non-uniform within the plate, resulting in poor flatness, which causes a problem that the product specifications are not satisfied.
これらを解決するための従来技術としては特公昭59-135
74号公報で示すように、鋼材をデスケーリングする際、
鋼材表面温度を高目に規制してヒートパターンを制御す
る技術および特公昭62-39044号公報で示すようにデスケ
ーリング終了後次のデスケーリング開始までの経過時間
を規制したものがある。As a conventional technique for solving these problems, Japanese Patent Publication No. 59-135
As shown in Japanese Patent Publication No. 74, when descaling a steel material,
There is a technique for controlling the heat pattern by controlling the steel surface temperature to a high level and a technique for controlling the elapsed time from the end of descaling to the start of the next descaling as shown in Japanese Patent Publication No. 62-39044.
通常、連続鋳造鋼片は連続鋳造設備内のロール帯、二次
冷却帯で高温多湿状態にさらされていて第２図に示すよ
うに鋼片表面にファヤライト層（2FeO・SiO2）、ウスタ
イト層(FeO)、マグネタイト層(Fe3O4)、ヘマタイト層(F
e2O3)により構成されるスケール層が存在する。ファヤ
ライト層は初期の段階は、剥離性がよいが、時間の経過
とともにウスタイト層及び地鉄粒界に侵入し剥離性が悪
くなる。また、ウスタイト層中にはファヤライトからの
ガス発生及び鉄イオンの外部拡散等により空孔、ワレが
成長し、空孔等の成長と共に剥離性が悪くなる。全体の
スケール層は、第３図に示すように経過時間の増加とと
もに厚みを増し、空気酸化よりも、連続鋳造設備の機内
における水蒸気雰囲気の酸化の方がより大きい。連続鋳
造設備の機内では通常40〜80分で鋼片が通過するので、
スケール層の全体厚みは約０．５mm程度である。さらに
鋼片は連続鋳造設備の機端以降加熱炉又は熱間圧延機ま
で空気酸化にさらされ１〜数時間経て、スケール層の全
体厚みは０．８mm以上に成長していき、加熱炉を通過
後、加熱酸化によるスケールの成長が行われ、合計でス
ケール層の厚みは１．５mm以上まで成長する。この段階
以降、高圧水噴射によるデスケーリングを行う場合、特
に脱スケール性の悪い鋼性、例えばシリコンキルド、ア
ルミキルド鋼やＮｉ，Ｃｕ，Ｍｏ等を含有する鋼種では
ファヤライト層を完全に除去することはできない。この
ことは特公昭62-39044号公報（第６図）に示しているよ
うに、約８％の欠陥発生材が生じていることからも明ら
かである。すなわち従来技術の課題としては、脱スケー
ル性の悪い鋼材では、スケール除去を完全に行うことが
できず、そのために、スケール起因の欠陥発生部材がま
た多いことがあげられる。Normally, the continuously cast steel pieces are exposed to high temperature and high humidity in the roll zone and the secondary cooling zone in the continuous casting equipment. As shown in Fig. 2, the surface of the billet is a fayalite layer (2FeO ・ SiO 2 ), a wustite layer. (FeO), magnetite layer (Fe 3 O 4 ), hematite layer (F
There is a scale layer composed of e 2 O 3 ). The fayalite layer has good releasability in the initial stage, but the releasability deteriorates as it penetrates into the wustite layer and the ground iron grain boundaries with the passage of time. Further, in the wustite layer, vacancies and cracks grow due to gas generation from fayalite and external diffusion of iron ions, etc., and the peelability deteriorates as the vacancies grow. As shown in FIG. 3, the entire scale layer increases in thickness with the lapse of time, and the oxidation of the steam atmosphere in the machine of the continuous casting equipment is larger than that of the air oxidation. In the continuous casting facility, the steel pieces usually pass in 40 to 80 minutes, so
The total thickness of the scale layer is about 0.5 mm . Further, the billet is exposed to air oxidation from the end of the continuous casting equipment to the heating furnace or hot rolling mill, and after 1 to several hours, the total thickness of the scale layer grows to 0.8 mm or more. After passing, the scale is grown by heating and oxidation, and the total thickness of the scale layer grows to 1.5 mm or more. After this stage, when performing descaling by high-pressure water injection, it is particularly difficult to completely remove the fayalite layer in steel properties with poor descaling properties, for example, silicon killed, aluminum killed steel, and steel types containing Ni, Cu, Mo, etc. Can not. This is also clear from the fact that about 8% of the defect-generating materials are produced as shown in Japanese Examined Patent Publication No. 62-39044 (FIG. 6). That is, as a problem of the prior art, it is not possible to completely remove the scale in the steel material having poor descaling property, and therefore, there are many more defect-generating members due to the scale.
本発明は従来技術の上記課題を有利に解決するものであ
って、その特徴とするところは 連続鋳造設備で製造される鋼片を前記連続鋳造設備の機
端より加熱炉まで搬送する搬送ロール帯上にデスケーリ
ング装置を設置し、該デスケーリング装置により吐出圧
力１０kg／cm2以上の高圧水を前記鋼片の表面に噴射す
る連続鋳造鋼片の脱スケール方法である。The present invention advantageously solves the above-mentioned problems of the prior art, and is characterized in that a conveyor roll band for conveying a steel slab produced in a continuous casting facility from the end of the continuous casting facility to a heating furnace. This is a descaling method for a continuously cast steel slab in which a descaling device is installed on the top and high-pressure water having a discharge pressure of 10 kg / cm 2 or more is jetted onto the surface of the slab by the descaling device.
本発明は連続鋳造装置の機端と加熱炉との間にデスケー
リング装置を設けて、特に剥離性の悪いファヤライト層
及び空孔、ワレを有するウスタイト層をかゝるスケール
が生長する前の初期生成段階で、高圧水噴射によって完
全に除去しようとするものである。このために、上記デ
スケーリング装置を機端にできるだけ近い位置に設置し
て鋼片が機端通過後、遅くとも１時間以内に高圧水噴射
が行われるようにすることが必要である。１時間以上経
過してウスタイト層とファヤライト層が０．５mm以上に
成長してしまうと後工程での高圧水によるデスケーリン
グではスケールを完全に剥離することは難しい。The present invention provides a descaling device between the end of the continuous casting device and the heating furnace, and the initial stage before the growth of the scale such as the farite layer and the wustite layer having pores and cracks, which have particularly poor peelability. It is intended to be completely removed by high-pressure water injection at the production stage. For this reason, it is necessary to install the descaling device at a position as close to the machine end as possible so that the high-pressure water jet is performed within one hour at the latest after the billet passes through the machine end. If the wustite layer and the fayalite layer grow to 0.5 mm or more after 1 hour or more, it is difficult to completely remove the scale by descaling with high-pressure water in the subsequent process.
本発明の実施例を図面に基づいて説明する。 An embodiment of the present invention will be described with reference to the drawings.
第１図は本発明の実施例による鋼材（鋼片及び鋼板）の
搬送工程を示す概要図である。鋼片は連続鋳造装置１の
機端２を経て加熱炉３まで搬送され、熱間圧延装置４の
粗圧延機５および仕上圧延機６を通過する。前記機端２
と加熱炉３との間にはデスケーリング装置１０が設けら
れている。このデスケーリング装置１０において、10〜
200kg／cm2程度の高圧水を 搬送速度10〜50ｍ／minで移動する鋼片表裏の表面に、
ノズル角度35〜55゜程度でかつ20〜60／min程度の量
を噴射する。これにより鋼片表面のヘマタイト層、マグ
ネタイト層、ウスタイト層は完全になくなりファヤライ
ト層もほとんど除去される。その後加熱炉３までは空気
酸化でスケールが０．３mm程度（ほとんどがウスタイト
層）生成し、さらに加熱炉３での加熱酸化によりスケー
ルが発生するが、この場合、ファヤライト層の生成が少
なく、その結果ウスタイト中の空孔、ワレの発生が抑制
されるため、剥離性の良いスケールが大部分を占める。
そのため加熱炉３と粗圧延機５との間のデスケーリング
装置７により、スケールはほぼ完全に除去される。FIG. 1 is a schematic diagram showing a conveying process of steel materials (steel pieces and steel sheets) according to an embodiment of the present invention. The billet is conveyed to the heating furnace 3 via the end 2 of the continuous casting apparatus 1 and passes through the rough rolling mill 5 and the finish rolling mill 6 of the hot rolling apparatus 4. The end 2
A descaling device 10 is provided between the heating furnace 3 and the heating furnace 3. In this descaling device 10,
High pressure water of about 200 kg / cm 2 is transferred to the front and back surfaces of the steel slab that moves at a transfer speed of 10 to 50 m / min.
The nozzle angle is about 35 to 55 ° and the amount is about 20 to 60 / min. As a result, the hematite layer, magnetite layer, and wustite layer on the surface of the billet are completely removed, and the faryalite layer is almost removed. After that, up to the heating furnace 3, a scale of about 0.3 mm (mostly a wustite layer) is generated by air oxidation, and further scale is generated by the heating oxidation in the heating furnace 3, but in this case, the formation of the fayalite layer is small, As a result, the generation of voids and cracks in the wustite is suppressed, and the scale with good peelability occupies the majority.
Therefore, the scale is almost completely removed by the descaling device 7 between the heating furnace 3 and the rough rolling mill 5.
その後鋼片は粗圧延機５及び仕上圧延機６で複数パス圧
延され、空気酸化によるスケールを０．２〜０．５mm程
度生じるが、デスケーリング装置８，９での高圧水噴射
によって完全に除去される。After that, the billet is rolled in multiple passes in the rough rolling mill 5 and the finish rolling mill 6 to generate a scale of about 0.2 to 0.5 mm due to air oxidation, but the descaling devices 8 and 9 completely inject high-pressure water. To be removed.
第１表にデスケーリング装置７〜１０の一仕様を示す。
鋼片は厚板40〜60kクラスのもので、機端２での厚みは
240mm、幅が１〜２．２mであり、仕上圧延機６の出側で
板厚４〜 180mmの鋼板に減厚されるものとする。Table 1 shows specifications of the descaling devices 7 to 10.
The billet is a thick plate 40-60 k class, and the thickness at the end 2 is
It has a thickness of 240 mm and a width of 1 to 2.2 m , and is reduced to a steel plate having a thickness of 4 to 180 mm on the exit side of the finish rolling mill 6.
第４図は鋼材（鋼片及び鋼板）の表面温度分布を示す。
機端２と加熱炉３との間にデスケーリング装置１０を設
けると、高圧水噴射時に一時点に鋼片表面温度が約１０
℃低下するが、鋼片内部の保有熱によってすぐに復熱す
るため、温度降下はデスケーリング装置１０がない場合
とほとんど同じである。FIG. 4 shows the surface temperature distribution of steel materials (steel pieces and steel sheets).
When the descaling device 10 is provided between the machine end 2 and the heating furnace 3, the surface temperature of the billet is about 10 at a certain point during high-pressure water injection.
However, the temperature drop is almost the same as in the case without the descaling device 10, because the temperature decreases by 0 ° C., but the heat retained inside the steel slab recovers immediately.
次に、上記仕様のデスケーリング装置１０によって通板
試験を行い、ショットブラスト処理後のスケール起因の
欠陥発生結果を、かかるデスケーリング装置を設置しな
い場合と比較して、第５図に示す（鋼片のＮ数：本発明
・213枚、比較例・249枚）。 Next, a strip running test was conducted by the descaling device 10 having the above specifications, and the result of scale-induced defect generation after shot blasting is shown in FIG. 5 in comparison with the case where such a descaling device is not installed (steel). N number of pieces: 213 sheets of the present invention, 249 sheets of comparative example).
本発明によればスケール起因の欠陥発生機の比率が27.7
％から2.9％に大幅に改善されている。According to the present invention, the ratio of scale-induced defect generators is 27.7.
% To 2.9%.
本発明は連続鋳造鋼片の製造直後において、剥離性の悪
いスケールが生長する前に完全にこれを除去するので、
後工程で発生したスケールも極めて除去し易くなり、こ
れによりスケール起因による欠陥発生が甚だしく減少す
る。従って、その工業的効果は甚大である。Immediately after the production of continuous cast steel slabs, the present invention completely removes this before the scale with poor peelability grows.
The scale generated in the subsequent process is also extremely easy to remove, which significantly reduces the generation of defects due to scale. Therefore, its industrial effect is enormous.
【図面の簡単な説明】 第１図は本発明の実施例による鋼材の搬送工程を示す概
略図、 第２図はスケール層の構造を示す概略断面図、 第３図はスケール層の厚さと経過時間との関係を示す
図、 第４図は本発明による鋼材表面温度推移を示す図、 第５図は本発明と従来法との比較を示す欠陥発生材の比
率を示す図である。 １…連続鋳造装置、 ２…連続鋳造装置の機端、 ３…加熱炉、 ４…熱間圧延装置、 ５…粗圧延機、 ６…仕上圧延機、 ７〜１０…デスケーリング装置。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a steel material conveying process according to an embodiment of the present invention, FIG. 2 is a schematic sectional view showing a structure of a scale layer, and FIG. 3 is a thickness and progress of the scale layer. FIG. 4 is a diagram showing a relationship with time, FIG. 4 is a diagram showing a transition of a steel material surface temperature according to the present invention, and FIG. 5 is a diagram showing a ratio of a defect generating material showing a comparison between the present invention and a conventional method. DESCRIPTION OF SYMBOLS 1 ... Continuous casting apparatus, 2 ... End of continuous casting apparatus, 3 ... Heating furnace, 4 ... Hot rolling apparatus, 5 ... Rough rolling machine, 6 ... Finishing rolling machine, 7-10 ... Descaling apparatus.
フロントページの続き (72)発明者 長田 元宏 千葉県君津市君津１番地 新日本製鐵株式 会社君津製鐵所内 (72)発明者 前田 弘志 千葉県君津市君津１番地 新日本製鐵株式 会社君津製鐵所内 (72)発明者 山田 友教 千葉県君津市君津１番地 新日本製鐵株式 会社君津製鐵所内 (56)参考文献 実開 昭62−61352（ＪＰ，Ｕ) 特公 昭59−11362（ＪＰ，Ｂ２) 実公 昭52−56348（ＪＰ，Ｙ２)Front Page Continuation (72) Inventor Motohiro Nagata 1 Kimitsu, Kimitsu-shi, Chiba Inside Nippon Steel Co., Ltd. (72) Hiroshi Maeda 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Kimitsu In-house (72) Inventor, Yumonori Yamada 1 Kimitsu, Kimitsu-shi, Chiba In-house of Nippon Steel Co., Ltd. (56) Bibliography 62-61352 (JP, U) JP 59-11362 (JP, B2) Jitsuko Sho 52-56348 (JP, Y2)
Claims (1)
鋳造設備の機端より加熱炉まで搬送する搬送ロール帯上
にデスケーリング装置を設置し、該デスケーリング装置
により吐出圧力10kg／cm2以上の高圧水を前記鋼片の表
面に噴射する ことを特徴とする連続鋳造鋼片の脱スケール方法。1. A descaling device is installed on a conveyor roll belt that conveys a steel slab produced by a continuous casting facility from the machine end of the continuous casting facility to a heating furnace, and the discharge pressure is 10 kg / cm by the descaling device. A method for descaling continuously cast steel pieces, comprising spraying two or more high-pressure water onto the surface of the steel pieces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63271048A JPH069707B2 (en) | 1988-10-28 | 1988-10-28 | Descaling method for continuously cast steel billets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63271048A JPH069707B2 (en) | 1988-10-28 | 1988-10-28 | Descaling method for continuously cast steel billets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02121714A JPH02121714A (en) | 1990-05-09 |
| JPH069707B2 true JPH069707B2 (en) | 1994-02-09 |
Family
ID=17494678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63271048A Expired - Lifetime JPH069707B2 (en) | 1988-10-28 | 1988-10-28 | Descaling method for continuously cast steel billets |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH069707B2 (en) |
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| DE102005047936A1 (en) * | 2005-10-06 | 2007-04-12 | Sms Demag Ag | Method and device for cleaning slabs, thin slabs, profiles or the like |
| CN101181718B (en) * | 2007-12-11 | 2010-06-02 | 武汉钢铁(集团)公司 | Method for producing wide strip steel by bar strip continuous casting and rolling as well as system therefor |
| CN104384209B (en) * | 2014-12-03 | 2016-06-01 | 首钢总公司 | A kind of method eliminating the clear striped of machine |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5256348U (en) * | 1975-10-21 | 1977-04-23 | ||
| JPS5911362A (en) * | 1982-07-12 | 1984-01-20 | Gosei Senriyou Gijutsu Kenkyu Kumiai | Monoazo dye for polyester fiber |
| JPS6261352U (en) * | 1985-10-03 | 1987-04-16 |
-
1988
- 1988-10-28 JP JP63271048A patent/JPH069707B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100880148B1 (en) * | 2001-09-07 | 2009-01-23 | 에스엠에스 데마그 악티엔게젤샤프트 | Apparatus for cleaning slab in front of roller forging furnace of mini mill and its working method |
| CN104550279A (en) * | 2014-11-26 | 2015-04-29 | 南京钢铁股份有限公司 | De-scaling method for steel plate at TMCP delivery state |
| CN104550237A (en) * | 2014-11-28 | 2015-04-29 | 中冶南方工程技术有限公司 | Continuous casting-direct rolling device for producing rod wire and section bar and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02121714A (en) | 1990-05-09 |
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