JPS6023171B2 - Hearth roll for continuous heat treatment furnace - Google Patents
Hearth roll for continuous heat treatment furnaceInfo
- Publication number
- JPS6023171B2 JPS6023171B2 JP14513579A JP14513579A JPS6023171B2 JP S6023171 B2 JPS6023171 B2 JP S6023171B2 JP 14513579 A JP14513579 A JP 14513579A JP 14513579 A JP14513579 A JP 14513579A JP S6023171 B2 JPS6023171 B2 JP S6023171B2
- Authority
- JP
- Japan
- Prior art keywords
- heat treatment
- continuous heat
- treatment furnace
- roll
- hearth roll
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Tunnel Furnaces (AREA)
- Coating By Spraying Or Casting (AREA)
Description
【発明の詳細な説明】
本発明は連続式熱処理炉用ハースロールの改良に関する
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in hearth rolls for continuous heat treatment furnaces.
このようなハースロ−ルにおいては、部分的に突部の生
じるいわゆるビルドアップが形成されることがある。In such hearth rolls, so-called build-ups, in which protrusions are partially formed, may be formed.
このビルドアップは。This buildup is.
金属ロールにおいて結晶粒々界の腐食した部分に鉄もし
くはその酸化物が溶着、積層したり、ロール表面のロー
ルの酸化物が鉄、ケイ素、マンガンなどの酸化物で帯板
表面の鉄もしくはその酸化物と反応して化合物を形成し
たり、ロール表面の酸化物に気孔があり、ここに帯板の
スケールが付着、積層したり、あるいはロール表面の酸
化物が剥離してロールの金属層が表面に露出し、その部
分に帯板のスケールが付着、積層したりして形成される
が、いずれにしても鉄鋼業の冷間圧延工程における熱処
理炉では、ロールのビルドアップによるピックアップ癖
により製品の格落ち、肩化がなされる。また、癖発生を
予防するためにラインを停止して研摩したりロールを取
替えることが行なわれ、生産性を低下している。このた
め、従来から、ニッケルクロム合金を０．１肋の厚さで
溶射した後、この外層にジルコニア、安定化ジルコニア
、アルミナ、グレイアルミナのいずれかを０．５側位溶
射し、ビルドアップの形成を防止していたが、このよう
にしても完全にはビルドアップの形成を予防することが
できず、やはりロールの研摩や交換をしなければならな
かつた。In metal rolls, iron or its oxides may be welded or laminated on the corroded parts of the grain boundaries, or the roll oxides on the roll surface may be oxides of iron, silicon, manganese, etc., and iron or its oxides on the surface of the strip. The oxide on the roll surface may have pores, and the scale of the strip may adhere or stack up there, or the oxide on the roll surface may peel off and the metal layer of the roll may appear on the surface. It is formed when the scale of the strip adheres to the exposed area and is laminated, but in any case, in the heat treatment furnace in the cold rolling process of the steel industry, the quality of the product is affected by the pick-up habit caused by the build-up of the rolls. It falls and the shoulder is turned. Furthermore, in order to prevent the occurrence of curls, the line must be stopped to perform polishing or replace the rolls, which reduces productivity. For this reason, conventionally, a nickel-chromium alloy is thermally sprayed to a thickness of 0.1 rib, and then zirconia, stabilized zirconia, alumina, or gray alumina is thermally sprayed on the 0.5 side of this outer layer to reduce the build-up. However, even with this method, the formation of build-up could not be completely prevented, and the roll still had to be polished or replaced.
本発明は、前述した従釆のものにおける欠点を除去し、
顕著にビルドアツプの形成を防止できる連続式熱処理炉
用ハースロールを提供することを目的としてなされたも
ので、ロール表面にニッケルクロム合金を溶射し、この
外層に炭化クロムを前記ニッケルクロム合金との合計膜
厚が０．０３〜０．１肋となるように溶射したものであ
る。The present invention obviates the disadvantages of the above-mentioned alternatives and
This was developed with the aim of providing a hearth roll for continuous heat treatment furnaces that can significantly prevent the formation of build-up.A nickel-chromium alloy is thermally sprayed on the roll surface, and chromium carbide is added to the outer layer of the nickel-chromium alloy. It is thermally sprayed to a film thickness of 0.03 to 0.1.
ここで、ニッケルクロム合金を溶射するのは密着性を良
くするためである。また、炭化クロムは高温における温
度が高く、高温耐摩耗性が優れ、繊密な被膜を形成する
ものであり、したがって、ビルドアップの形成が防止さ
れ、そして、最後に＄程度の仕上げを行なえば良い。な
お、被膜の厚さが０．０３側未満と薄すぎると効果がな
く、また、従来のように溶射層の厚さを０．５柳の如く
厚くすると、炭化クロムの特性と合計膜厚の極薄化との
相乗効果によるビルドアップ形成防止効果が低下し、剥
離が発生しかねないので、０．１肌を上限値とする。。
つぎに、本発明の実施例を説明する。Here, the reason why the nickel chromium alloy is thermally sprayed is to improve adhesion. In addition, chromium carbide has a high temperature at high temperatures, has excellent high-temperature wear resistance, and forms a dense film, thus preventing the formation of build-up, and finally, if a finishing of about $. good. It should be noted that if the coating thickness is too thin (less than 0.03 mm), it will not be effective, and if the thickness of the sprayed layer is increased to 0.5 mm as in the past, the characteristics of chromium carbide and the total coating thickness will be affected. The upper limit is set at 0.1 skin because the synergistic effect with ultra-thinning may reduce the build-up prevention effect and cause peeling. .
Next, examples of the present invention will be described.
ニッケルクロム合金を０．０２側溶射し、この外層に炭
化クロムを０．０８側溶射し、最後に＄仕上げしたハー
スロールを、ＡＸガス雰囲気のもとに８５０午０へ８０
の／ｍｊｎ走行速度の冷延鋼板０．６×１０００肋に使
用したところ、従釆のハースロールにおいては３ケ月で
あった耐用規間が２年まで延びた。Nickel chromium alloy was thermally sprayed on the 0.02 side, chromium carbide was thermally sprayed on the outer layer on the 0.08 side, and the hearth roll, which had been finished with a $ finish, was heated from 850 to 80 in an AX gas atmosphere.
When used on a 0.6 x 1000 cold-rolled steel plate with a running speed of /mjn, the service life of the conventional hearth roll was extended to 2 years from 3 months.
本発明に係る連続式熱処理炉用ハースロールは、前述し
たように、ロール表面にニッケルクロム合金を港射し、
この外層に炭化クロムを、ニッケルクロム合金との合計
膜厚が０．０３〜０．１肋となるように溶射したので、
従来のロールにおいてライン停止して行なうロール研摩
間隔が２日に１回であったのが１週間に１回と延び、ま
た、従釆のロールにおけるロール取替の３ケ月も２年と
延び、さらには、従来のロールによるピックアップ頻発
生率の３％が０．２％まで低下した。以上のように、本
発明に係る連続式熱処理炉用ハースロールは、ロール表
面にニッケルクロム合金を港射し、この外層に炭化クロ
ムを、前記ニッケルクロム合金との合計膜厚が０．０３
〜０．１肋となるように溶射するようにしたので、ビル
ドアップの形成を顕著に防止することができるという効
果を有する。As mentioned above, the hearth roll for a continuous heat treatment furnace according to the present invention has a nickel-chromium alloy coated on the roll surface,
Chromium carbide was sprayed on this outer layer so that the total film thickness with the nickel chromium alloy was 0.03 to 0.1.
With conventional rolls, the interval for polishing the rolls when the line was stopped was extended from once every two days to once a week, and the three-month period required for replacing rolls on secondary rolls was extended to two years. Furthermore, the pick-up frequency rate of 3% with the conventional roll has decreased to 0.2%. As described above, the hearth roll for a continuous heat treatment furnace according to the present invention has a nickel-chromium alloy coated on the roll surface, chromium carbide on the outer layer, and a total film thickness of 0.03.
Since the thermal spraying was performed so as to have a thickness of ~0.1, the formation of build-up can be significantly prevented.
Claims (1)
層に炭化クロムを、前記ニツケルクロム合金との合金膜
厚が０．０３〜０．１ｍｍとなるように溶射したことを
特徴とする連続式熱処理炉用ハースロール。1. A continuous heat treatment furnace characterized in that a nickel chromium alloy is thermally sprayed on the roll surface, and chromium carbide is thermally sprayed on this outer layer so that the alloy film thickness with the nickel chromium alloy is 0.03 to 0.1 mm. hearth roll.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14513579A JPS6023171B2 (en) | 1979-11-08 | 1979-11-08 | Hearth roll for continuous heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14513579A JPS6023171B2 (en) | 1979-11-08 | 1979-11-08 | Hearth roll for continuous heat treatment furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5669321A JPS5669321A (en) | 1981-06-10 |
| JPS6023171B2 true JPS6023171B2 (en) | 1985-06-06 |
Family
ID=15378210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14513579A Expired JPS6023171B2 (en) | 1979-11-08 | 1979-11-08 | Hearth roll for continuous heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6023171B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58141338A (en) * | 1982-02-12 | 1983-08-22 | Kawasaki Steel Corp | Roll for continuous heat treatment furnace |
| JPS6033364A (en) * | 1983-08-01 | 1985-02-20 | Koei Seikou Kk | Hearth roll for heat treating furnace and preparation thereof |
| JPS62205223A (en) * | 1986-03-05 | 1987-09-09 | Kubota Ltd | Hearth roll for heat treatment furnace |
| JPH0353055A (en) * | 1989-07-19 | 1991-03-07 | Kobe Steel Ltd | Metallic roll having ceramic thermally sprayed surface |
| WO2022054559A1 (en) * | 2020-09-08 | 2022-03-17 | トーカロ株式会社 | Hearth roll |
-
1979
- 1979-11-08 JP JP14513579A patent/JPS6023171B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5669321A (en) | 1981-06-10 |
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