JPH0747766B2 - Hearth roll for continuous heat treatment - Google Patents
Hearth roll for continuous heat treatmentInfo
- Publication number
- JPH0747766B2 JPH0747766B2 JP61209139A JP20913986A JPH0747766B2 JP H0747766 B2 JPH0747766 B2 JP H0747766B2 JP 61209139 A JP61209139 A JP 61209139A JP 20913986 A JP20913986 A JP 20913986A JP H0747766 B2 JPH0747766 B2 JP H0747766B2
- Authority
- JP
- Japan
- Prior art keywords
- hearth roll
- heat treatment
- roughness
- continuous heat
- processed
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
- C21D9/563—Rolls; Drums; Roll arrangements
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、鋼板等の連続熱処理を行う際に、連続熱処
理炉内において鋼板の蛇行や押し疵不良等を生じないよ
うにした連続熱処理用ハースロールに関する。The present invention relates to a continuous heat treatment for continuous heat treatment of a steel sheet or the like, in which a meandering of the steel sheet, a flaw defect or the like does not occur in the continuous heat treatment furnace. Regarding Hearth Roll.
一般に、鋼板等を所定のラインスピードで通板して熱処
理を行う連続熱処理炉において、この炉内に設けられた
ハースロールにはその表面に対摩耗処理や鋼板の蛇行を
防ぐための手段等が施されている。Generally, in a continuous heat treatment furnace that heat-treats a steel sheet or the like at a predetermined line speed, the hearth roll provided in this furnace has a means for preventing abrasion treatment and meandering of the steel sheet on its surface. It has been subjected.
対摩耗処理としては、ハースロールの表面にタングステ
ンカーバイトやクロームカーバイト又はセラミック等を
溶射することによって耐摩耗性を付与することが行われ
ている。As the anti-wear treatment, the wear resistance is provided by spraying tungsten carbide, chrome carbide, ceramic or the like on the surface of the hearth roll.
また、鋼板の蛇行を防ぐためには、ハースロールの外形
線にクラウンと称する傾斜部を付与することが行われて
いるが、さらにハースロールの表面を適当な粗度に形成
して、先ず鋼板のスリップを防ぐことが前提となる。Further, in order to prevent the meandering of the steel sheet, an inclined portion called a crown is given to the outer shape line of the hearth roll. Preventing slippage is a prerequisite.
そこで、上記の問題に対処するために、従来はハースロ
ールの表面に前記耐摩耗性の高い材料を溶射した後、シ
ョットブラストを施してある程度の粗度を形成すること
により鋼板のスリップを防止していた。Therefore, in order to deal with the above problems, conventionally, after the material having high wear resistance is sprayed on the surface of the hearth roll, shot blasting is performed to form a certain degree of roughness to prevent the steel sheet from slipping. Was there.
しかしながら、従来のような鋼板のスリップを防止する
ためのハースロール表面の粗度を形成する方法にあって
は、該ロール表面に前記耐摩耗性の大きい材料を溶射し
た後の硬度の高い表面にショットブラストを施す方法で
あるために、ショットブラストによるロール表面粗度が
小さく、わずか数ケ月の操業によって鋼板のスリップな
いし蛇行が始まるといった問題点があった。However, in the method of forming the roughness of the hearth roll surface for preventing the slip of the steel sheet as in the prior art, a high hardness surface after spraying the material having high wear resistance on the roll surface is used. Since the method is shot blasting, there is a problem that the roll surface roughness due to shot blasting is small, and slip or meandering of the steel sheet starts after only a few months of operation.
この発明は、このような従来の問題点にかんがみてなさ
れたものであって、ハースロール表面にショットブラス
ト等による粗面化を施した後に所定膜厚に耐摩耗材を溶
射することにより、上記問題点を解決することを目的と
している。The present invention has been made in view of the above-mentioned conventional problems, in which the wear-resistant material is sprayed to a predetermined film thickness after roughening the hearth roll surface by shot blasting, etc. The purpose is to solve the problem.
この発明は、被処理材が，ラインスピード（mpm）に被
処理材板厚（mm）を乗じた値が100（mpm・mm）以上で処
理される連続熱処理炉のハースロールにおいて、表面粗
度Raを4.5μ乃至20μに形成した表面に膜厚が１μ以上
乃至100μ以下となるように耐摩耗材の溶射又はめっき
を施して表面粗度Raを4.5μ乃至20μにした連続熱処理
用ハースロールとしたものである。This invention is a hearth roll of a continuous heat treatment furnace in which a material to be treated is processed at a line speed (mpm) multiplied by a material thickness (mm) of 100 (mpm · mm) or more. A continuous heat treatment hearth roll with a surface roughness Ra of 4.5μ to 20μ by spraying or plating a wear resistant material on the surface with Ra of 4.5μ to 20μ to a film thickness of 1μ to 100μ It is a thing.
連続熱処理炉に設けられたハースロールは、被処理材の
通板速度に比例してハースロールの表面粗度を大きくし
ないと被処理材がハースロール表面上でスリップし、か
つ蛇行する不具合が生じる。For the hearth roll installed in the continuous heat treatment furnace, unless the surface roughness of the hearth roll is increased in proportion to the plate passing speed of the material to be processed, the material to be processed will slip on the surface of the hearth roll and meander. .
そこで、被処理材がラインスピード（mpm）×被処理材
板厚（mm）≧100（mpm・mm）で処理される連続熱処理炉
のハースロールには、その表面を先ずショットブラスト
等の粗面化手段によて表面粗度Raを4.5μ乃至20μと
し、しかる後にその表面に膜厚が１μ〜100μの範囲内
となるように耐摩耗材の溶射又はめっきを施すことによ
って表面の粗度Raを4.5μ乃至20μに保つことができた
ので、被処理材のハースロールに対するスリップや蛇行
が起こらない。Therefore, for the hearth roll of the continuous heat treatment furnace in which the material to be treated is processed at line speed (mpm) × material thickness (mm) ≧ 100 (mpm · mm), the surface should first be roughened by shot blasting etc. The surface roughness Ra is adjusted to 4.5 μ to 20 μ by means of a heat treatment means, and thereafter the surface roughness Ra is reduced by spraying or plating the wear resistant material so that the film thickness is within the range of 1 μ to 100 μ. Since it could be kept at 4.5μ to 20μ, slipping or meandering of the material to be processed against the hearth roll does not occur.
以下、この発明を図面に基づいて説明する。第１〜４図
は本発明の実施例の説明図である。The present invention will be described below with reference to the drawings. 1 to 4 are explanatory views of an embodiment of the present invention.
第１図において、１は直径がＤであるハースロールであ
って、1aは加工前の表面を示す。この加工前の表面1aを
鋼球や超硬金属球等を用いてショットブラストを施し、
又はレーザ照射等を施すことによって粗面化し、そのRa
値（中心線平均粗さ）が4.5μ乃至20μとなるようにす
る（第１図（ａ）参照）。次に、この粗面化した表面
に、セラミックやタングステンカーバイト（WC），クロ
ムカーバイト（Cr3C2）等の耐摩耗材がその膜厚が１μ
以上100μ以下の範囲となるように溶射又はめっきを行
う。そして、上記耐摩耗材を溶射することによって耐摩
耗性の大きい被膜２を形成するとともに、ハースロール
表面1aの粗度Raが4.5μ乃至20μの範囲で形成される。In FIG. 1, 1 is a hearth roll having a diameter of D, and 1a is a surface before processing. This surface 1a before processing is shot blasted using a steel ball or a super hard metal ball,
Alternatively, the surface is roughened by laser irradiation and the Ra
The value (average roughness of the center line) is set to 4.5 μ to 20 μ (see FIG. 1 (a)). Next, wear-resistant materials such as ceramics, tungsten carbide (WC), and chrome carbide (Cr 3 C 2 ) have a thickness of 1 μm on the roughened surface.
Thermal spraying or plating is performed so that the range is 100 μm or less. Then, by spraying the above wear-resistant material, the coating 2 having high wear resistance is formed, and the roughness Ra of the hearth roll surface 1a is formed in the range of 4.5 μ to 20 μ.
また、上記膜厚を例えば経済的理由から１μ以下とする
と、微小凹凸の凸部が早期に磨滅して地金が露出するた
めであり、上限を100μとしたのは、これ以上膜厚が大
きいと最終的に表面粗度Raが4.5〜20μの範囲に仕上ら
ないためである。In addition, if the film thickness is set to 1 μm or less for economic reasons, for example, the convex portions of the minute irregularities are worn out early and bare metal is exposed. The upper limit is 100 μ, and the film thickness is larger than this. Finally, the surface roughness Ra is not finished in the range of 4.5 to 20μ.
また、鋼板等がLSD値（ラインスピード×鋼板板厚）が1
00以上で処理される連続焼鈍炉等のハースロール表面の
粗度Raは、鋼板のスリップや蛇行を生じない条件とし
て、第２図に示すごとく、4.5μ以上に形成される必要
があるとともに、後述のピックアップを生じないために
20μ以下であることが必要とされるが、本発明はこの条
件に適応していることになる。In addition, steel plates, etc. have an LSD value (line speed x steel plate thickness) of 1
Roughness Ra of the hearth roll surface of a continuous annealing furnace or the like processed at 00 or more needs to be 4.5 μm or more as shown in FIG. 2 under the condition that the steel sheet does not slip or meander. In order not to cause the pickup described below
Although it is required that the thickness be 20 μ or less, the present invention is adapted to this condition.
また、表面粗度Raが20μを超えて大きくなると、還元性
雰囲気において操業される炉内でもその出入口から侵入
するO2が微量に存在して生じる酸化スケールの微小片が
ハースロール表面の微小凹凸部に付着し、鋼板にピック
アップと称される疵を生じることになる。Also, when the surface roughness Ra exceeds 20μ and becomes large, even in a furnace operated in a reducing atmosphere, a small amount of O 2 that enters from the entrance and exit of the oxide scale causes minute fragments of oxide scale to form minute irregularities on the hearth roll surface. It adheres to the part and causes a flaw called a pickup on the steel plate.
次に、従来のように、ハースロール表面に先ず耐摩耗材
を溶射又はめっきした後に、表面粗度を形成するため
に、例えばセラミック片を混入してショットブラストを
行っても、表面が硬いために前記Ra値は３〜５μ程度し
か得られず、早期にスリップが生じるのを避けられなか
った。Next, as in the prior art, after the wear resistant material is first sprayed or plated on the hearth roll surface, in order to form the surface roughness, for example, even if a ceramic piece is mixed and shot blasting is performed, the surface is hard. Since the Ra value was only about 3 to 5 μm, it was unavoidable that slip occurred at an early stage.
以上の関係を第３図に示す。縦軸は操業経過月数を、横
軸に粗度を示す。すなわち、ハースロール表面の粗度Ra
の最適範囲は斜線で示すように4.5μ乃至20μであるこ
とが知見されている。The above relationship is shown in FIG. The vertical axis shows the number of operating months, and the horizontal axis shows the roughness. That is, the roughness Ra of the hearth roll surface
It has been found that the optimum range of is from 4.5 μ to 20 μ as indicated by the diagonal lines.
第４図はハースロール表面の対摩耗性を示す線図であっ
て、縦軸は摩耗率、横軸は操業経過月数をとったもので
ある。図から明らかなように、ハースロールにショット
ブラストのみを施した場合は約20ケ月の操業で粗度が約
80％低下し、もし粗度を20μに形成しても約10ケ月の操
業で粗度が第３図における最適範囲の下限になることを
示し、また溶射されたタングステンカーバイトやクロム
カーバイト等の粗度は長期にわたって10〜20％程度の低
下にとどまることを示している。FIG. 4 is a diagram showing the wear resistance of the hearth roll surface, in which the vertical axis represents the wear rate and the horizontal axis represents the number of elapsed months of operation. As can be seen from the figure, when only the shot blast is applied to the hearth roll, the roughness is about 20 months of operation.
80% decrease, showing that the roughness becomes the lower limit of the optimum range in Fig. 3 in about 10 months of operation even if the roughness is formed to 20μ, and also the sprayed tungsten carbide, chromium carbide, etc. It shows that the roughness of the is reduced by about 10 to 20% over a long period of time.
以上説明したように、本発明によればハースロール表面
を先ず表面必要粗度Raを4.5μ乃至20μに形成した後、
耐摩耗材をその膜厚が、１μ以上100μ以下となるよう
に溶射又はめっきを施すことによって表面粗度Raを4.5
〜20μとしたために、LSD≧100で操業される連続熱処理
炉のハースロールにおいて、鋼板等のスリップ，蛇行や
ピックアップを防止するとともに、ハースロールの寿命
を大幅に伸長できるという効果が得られる。As described above, according to the present invention, the hearth roll surface is first formed with the required surface roughness Ra of 4.5 μ to 20 μ,
The surface roughness Ra is 4.5 by spraying or plating the wear resistant material so that the film thickness becomes 1 μ or more and 100 μ or less.
Since it is set to -20 μm, in the hearth roll of the continuous heat treatment furnace operated with LSD ≧ 100, it is possible to prevent the slip, meandering and pickup of the steel plate and the like, and to significantly extend the life of the hearth roll.
第１図（ａ），（ｂ）は本発明に係る実施例の説明図、
第２図はラインスピードに対応するハースロール表面の
必要粗度を示す線図、第３図はハースロール表面の粗度
の最適範囲を示す線図、第４図はハースロールの摩耗率
と寿命の関係を示す線図である。 １……ハースロール、1a……ハースロール表面、２……
被膜。1 (a) and 1 (b) are explanatory views of an embodiment according to the present invention,
Fig. 2 is a diagram showing the required roughness of the hearth roll surface corresponding to the line speed, Fig. 3 is a diagram showing the optimum range of the roughness of the hearth roll surface, and Fig. 4 is the wear rate and life of the hearth roll. It is a diagram showing the relationship of. 1 …… Hearth roll, 1a …… Hearth roll surface, 2 ……
Coating.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 安永 久雄 千葉県千葉市川崎町１番地 川崎製鉄株式 会社千葉製鉄所内 (72)発明者 笠井 聡 千葉県千葉市川崎町１番地 川崎製鉄株式 会社千葉製鉄所内 (56)参考文献 特開 昭61−253385（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hisao Yasunaga 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Chiba Works (72) Inventor Satoshi Kasai 1 Kawasaki-cho, Chiba Chiba Steel Co., Ltd. Chiba Steel In-house (56) Reference JP-A-61-253385 (JP, A)
Claims (1)
処理材の板厚（mm）を乗じた数値が100（mpm・mm）以上
で処理される連続熱処理炉のハースロールにおいて、表
面粗度Raを4.5μ乃至20μに形成した表面に膜厚が１μ
以上乃至100μ以下となるように耐摩耗材の溶射又はめ
っきを施して表面粗度Raを4.5μ乃至20μに形成したこ
とを特徴とする連続熱処理用ハースロール。1. A surface of a hearth roll of a continuous heat treatment furnace in which a material to be processed is processed at a line speed (mpm) multiplied by a plate thickness (mm) of the material to be processed is 100 (mpm · mm) or more. Roughness Ra is 4.5μ to 20μ and the film thickness is 1μ on the surface.
A hearth roll for continuous heat treatment, characterized in that a wear-resistant material is sprayed or plated to have a surface roughness Ra of 4.5 μ to 20 μ so as to be not less than 100 μ and not more than 100 μ.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61209139A JPH0747766B2 (en) | 1986-09-05 | 1986-09-05 | Hearth roll for continuous heat treatment |
| DE8787112889T DE3767283D1 (en) | 1986-09-05 | 1987-09-03 | DEVICE FOR CONTINUOUS GLOWING OF METAL STRIPS AND ROLLER HERE FOR THIS. |
| ES87112889T ES2019913B3 (en) | 1986-09-05 | 1987-09-03 | APPARATUS FOR CONTINUOUS ANNEALING OF METALLIC BAND AND THE ROLLERS OF THE SAME CAMERA. |
| EP87112889A EP0266509B1 (en) | 1986-09-05 | 1987-09-03 | Apparatus for continuously annealing metal strip and hearth roll therefor |
| ZA876579A ZA876579B (en) | 1986-09-05 | 1987-09-03 | Method and apparatus for continuously annealing metal strip and hearth roll therefor |
| BR8704646A BR8704646A (en) | 1986-09-05 | 1987-09-04 | OVEN FOR HEATING TREATMENT, RECOVERY OVEN AND SILL ROLL FOR THE SAME |
| KR1019870009780A KR950006692B1 (en) | 1986-09-05 | 1987-09-04 | Apparatus for annealing metal strip |
| AU78110/87A AU600516B2 (en) | 1986-09-05 | 1987-09-07 | Method and apparatus for continuously annealing metal strip and hearth roll therefor |
| US07/358,477 US4909485A (en) | 1986-09-05 | 1989-05-30 | Apparatus for continuously annealing metal strip and hearth roll therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61209139A JPH0747766B2 (en) | 1986-09-05 | 1986-09-05 | Hearth roll for continuous heat treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6365017A JPS6365017A (en) | 1988-03-23 |
| JPH0747766B2 true JPH0747766B2 (en) | 1995-05-24 |
Family
ID=16567944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61209139A Expired - Fee Related JPH0747766B2 (en) | 1986-09-05 | 1986-09-05 | Hearth roll for continuous heat treatment |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0747766B2 (en) |
| ZA (1) | ZA876579B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007148414A1 (en) * | 2006-06-21 | 2007-12-27 | Nippon Steel Corporation | Delivery roll, and hearth roll for continuous annealing furnace |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011205051A (en) | 2009-06-26 | 2011-10-13 | Fujifilm Corp | Light-reflecting substrate and process for manufacture thereof |
| JP2012033853A (en) | 2010-04-28 | 2012-02-16 | Fujifilm Corp | Insulation light reflection substrate |
| US9573404B2 (en) | 2011-10-28 | 2017-02-21 | Fujifilm Corporation | Manufacturing method and manufacturing apparatus of support for planographic printing plate |
| WO2018092898A1 (en) * | 2016-11-17 | 2018-05-24 | Ｊｆｅスチール株式会社 | Sheet-passing method for steel sheet, production equipment for thin steel sheet, and production method for steel sheet |
| WO2018092360A1 (en) * | 2016-11-17 | 2018-05-24 | Ｊｆｅスチール株式会社 | Sheet-passing method for steel sheet, and production equipment for thin steel sheet |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61253385A (en) * | 1985-04-30 | 1986-11-11 | Kawasaki Steel Corp | Manufacture of roll for heat treating furnace |
-
1986
- 1986-09-05 JP JP61209139A patent/JPH0747766B2/en not_active Expired - Fee Related
-
1987
- 1987-09-03 ZA ZA876579A patent/ZA876579B/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007148414A1 (en) * | 2006-06-21 | 2007-12-27 | Nippon Steel Corporation | Delivery roll, and hearth roll for continuous annealing furnace |
| JP2008001927A (en) * | 2006-06-21 | 2008-01-10 | Nippon Steel Corp | Conveying roll and hearth roll for continuous annealing furnace |
| US8328705B2 (en) | 2006-06-21 | 2012-12-11 | Nippon Steel Corporation | Conveying roll, and hearth roll in a continuous annealing furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6365017A (en) | 1988-03-23 |
| ZA876579B (en) | 1988-03-07 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |