JPH01122611A - Carrying roll for high temperature steel material - Google Patents
Carrying roll for high temperature steel materialInfo
- Publication number
- JPH01122611A JPH01122611A JP27825987A JP27825987A JPH01122611A JP H01122611 A JPH01122611 A JP H01122611A JP 27825987 A JP27825987 A JP 27825987A JP 27825987 A JP27825987 A JP 27825987A JP H01122611 A JPH01122611 A JP H01122611A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- coating layer
- cr2o3
- coated layer
- alloy
- 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
- 239000000463 material Substances 0.000 title claims description 22
- 229910000831 Steel Inorganic materials 0.000 title claims description 20
- 239000010959 steel Substances 0.000 title claims description 20
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 239000011247 coating layer Substances 0.000 claims description 34
- 239000011195 cermet Substances 0.000 claims description 21
- 239000002131 composite material Substances 0.000 claims description 11
- 238000011049 filling Methods 0.000 claims description 3
- 229910002441 CoNi Inorganic materials 0.000 claims description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract description 14
- 239000007921 spray Substances 0.000 abstract description 8
- 239000011148 porous material Substances 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 abstract description 5
- 230000009257 reactivity Effects 0.000 abstract description 3
- 229910000531 Co alloy Inorganic materials 0.000 abstract 1
- 229910000990 Ni alloy Inorganic materials 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 description 13
- 239000011651 chromium Substances 0.000 description 10
- 229910052804 chromium Inorganic materials 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000005507 spraying Methods 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 238000000137 annealing Methods 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 230000002265 prevention Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910000946 Y alloy Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- 150000001845 chromium compounds Chemical class 0.000 description 2
- 229910000423 chromium oxide Inorganic materials 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 101100032932 Mus musculus Raly gene Proteins 0.000 description 1
- 229910006501 ZrSiO Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/008—Rollers for roller conveyors
-
- 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
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0012—Rolls; Roll arrangements
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、高温鋼材用搬送ロールに関するものであり、
例えば熱処理炉内に配設される鋼板搬送用ロールについ
ての提案である。特に、本発明は、高温耐摩耗性とビル
ドアップ防止効果に優れると共にロール基体との密着性
に優れて剥離することがなく、かつ高温強度にも優れた
高温鋼材用搬送ロールの被覆層構造についての新規提案
である。[Detailed description of the invention] (Industrial application field) The present invention relates to a conveyor roll for high-temperature steel materials,
For example, this is a proposal for a roll for conveying steel plates disposed in a heat treatment furnace. In particular, the present invention relates to a coating layer structure of a conveyor roll for high-temperature steel materials that has excellent high-temperature wear resistance and build-up prevention effect, has excellent adhesion to the roll base so that it will not peel off, and has excellent high-temperature strength. This is a new proposal.
（従来の技術）
熱処理炉、例えば連続焼鈍炉内に配設されているハース
ロールは、６００〜１４００℃の酸化性または還元性雰
囲気中に長時間曝されており、しかも被焼鈍材をそうし
た雰囲気の中で搬送するのであるから、その表面は著し
く摩耗を受けると共に該ロール表面には被焼鈍材の付着
酸化物や鉄粉が堆積。(Prior Art) A hearth roll disposed in a heat treatment furnace, for example, a continuous annealing furnace, is exposed to an oxidizing or reducing atmosphere at 600 to 1400°C for a long time, and the material to be annealed is exposed to such an atmosphere. Since the roll is conveyed in a roll, its surface is subject to significant wear, and oxides of the material to be annealed and iron powder are deposited on the roll surface.
凝着して、いわゆるビルドアップを形成しやすい。They tend to stick together and form so-called build-ups.
このように、該ハースロールに摩耗やビルドアップによ
る凹凸が発生すると、被熱処理材（以下は「焼鈍材」の
例で述べる）である鋼板には、搬送に伴って疵が入る。In this way, when unevenness occurs on the hearth roll due to wear or build-up, the steel plate that is the material to be heat treated (hereinafter described as an example of "annealed material") will become flawed during transportation.
そのために、焼鈍材の品質低下を招いていた。This has led to a decline in the quality of the annealed material.
従来、このような焼鈍材の品質低下を防止するために、
操業を定期的に中断し、熱処理炉内を冷却してから、作
業者が炉内に入り二該ハースロールの表面を研削手入れ
をしたり、ロールそのものを取り替えたりしていた。Conventionally, in order to prevent such quality deterioration of annealed materials,
After periodically interrupting the operation and cooling the inside of the heat treatment furnace, workers enter the furnace to grind the surface of the hearth roll or replace the roll itself.
かような状況の下に使われている従来のハースロールと
しては、
（１１通板する被焼鈍材を、高Ｃｒ、高Ｎｉ含有の耐熱
合金製ロールを水冷または非水冷式で支持し、搬送に供
する金属ロール、
（２）前記（１）の耐熱合金製ロールの寿命延長を目的
とし、該耐熱合金製ロール表面に、Ａ１□０３やＺｒＯ
□、５ｉＯｚなどのセラミックスを被覆溶着したセラミ
ック被覆ロール、またはセラミックス、セラミックファ
イバー製のスリーブ状セラミックロール、
（３）黒鉛または黒鉛質繊維製スリーブ状カーボンロー
ル、
等が知られている。Conventional hearth rolls used under such circumstances are: (2) For the purpose of extending the life of the heat-resistant alloy roll described in (1) above, the surface of the heat-resistant alloy roll is coated with A1□03 or ZrO.
□, a ceramic coated roll coated with a welded ceramic such as 5iOz, a sleeve-shaped ceramic roll made of ceramic or ceramic fiber, (3) a sleeve-shaped carbon roll made of graphite or graphite fiber, etc. are known.
（発明が解決しようとする問題点）
上述した従来使用されているハースロールは、本発明者
らが希望する特性を満足するものではない。(Problems to be Solved by the Invention) The previously used hearth rolls described above do not satisfy the characteristics desired by the inventors.
すなわち、上記ｆｌ）に挙げた水冷金属ロールについて
は、ロール表面温度が低下するので、ビルドアンプの発
生防止には効果があるが、水冷による熱量損失が大きく
なるという欠点がある。一方、非水冷金属ロールの場合
、水冷による熱量損失は解消できるものの、炉内温度（
ロール温度）が８００℃以上にもなるので却ってビルド
アップが多発し、被焼鈍材の押疵の原因となって品質低
下を招いていた。That is, regarding the water-cooled metal roll mentioned in fl) above, since the roll surface temperature decreases, it is effective in preventing the build-up, but it has the disadvantage that the loss of heat due to water cooling becomes large. On the other hand, in the case of non-water-cooled metal rolls, although the heat loss due to water cooling can be eliminated, the furnace temperature (
Since the roll temperature (roll temperature) exceeds 800° C., build-up occurs frequently, causing dents in the material to be annealed and deteriorating quality.
次に、前記耐熱合金製ロールのもつ欠点を克服するもの
として、上記（２）に記述したロール；すなわち耐熱合
金製ロール表面に、Ａ１．○、 、 Ｚｒ０ｚ＋５ｔｏ
２等のセラミックスを被覆溶着したものがあるが、この
従来セラミック被覆ロールも、素材と溶着層との熱膨張
差に起因する剥離を生じやすく、これがロール寿命を決
定してしまうという問題点があった。なお、この剥離の
防止対策が研究され、その成果も発表されているが、ハ
ースロールに要求される特性をすべて満足するには至っ
ていない。Next, in order to overcome the drawbacks of the heat-resistant alloy roll, the roll described in (2) above; that is, A1. ○, , Zr0z+5to
There are rolls that are coated and welded with grade 2 ceramics, but these conventional ceramic coated rolls also tend to peel off due to the difference in thermal expansion between the material and the welded layer, and this has the problem of determining the life of the roll. Ta. Although measures to prevent this peeling have been studied and the results have been published, it has not yet been possible to satisfy all the characteristics required of hearth rolls.
例えば、特開昭６０−２６５８号公報で提案されている
″ Ｃｒ２Ｏ３とＣＯとのサーメット溶射皮膜を形成し
たハースロール”は、剥離防止対策においては一応の目
的を達し得ているが、溶射皮膜に存在する気孔がビルド
アップの起点となり、十分な効果が発揮されていない。For example, the "Hearth roll with a cermet sprayed coating of Cr2O3 and CO" proposed in Japanese Patent Application Laid-open No. 60-2658 has achieved a certain purpose in terms of preventing peeling, but the thermal sprayed coating has The existing pores become the starting point for build-up, and the sufficient effect is not exhibited.
さらにＣｏ単味では８５０℃以上の雰囲気中で酸化を生
じ長期間の使用が困難であった。Furthermore, Co alone causes oxidation in an atmosphere of 850° C. or higher, making it difficult to use for a long period of time.
また、特願昭６０−２６５８号公報で提案されている“
ＺｒＳｉ Ｏ，と耐熱合金からなるサーメット溶射層に
酸化クロムを封孔被覆してなるハースロール”は、剥離
防止および耐ビルドアツプ性に優れているが、ＺｒＳｉ
Ｏ４セラミツクスの硬度が低いために長時間の使用で
は溶射皮膜表面に摩耗が発生するという欠点があった。Also, as proposed in Japanese Patent Application No. 60-2658,
"Hearth roll" is made of a cermet sprayed layer made of ZrSiO, and a heat-resistant alloy and sealed with chromium oxide, which has excellent peeling prevention and build-up resistance.
Due to the low hardness of O4 ceramics, there is a drawback that wear occurs on the surface of the sprayed coating when used for a long time.
また、スリーブ状セラミックロールあるいはこのセラミ
ックスリーブをロールに嵌合させたロールは、セラミッ
クスリーブ自体の機械的強度が弱いため割れやすく、取
付は時などに十分な注意が必要となり、セラミックスの
長所である耐ビルドアツプ性が減殺されるという問題点
があった。In addition, sleeve-shaped ceramic rolls or rolls in which this ceramic sleeve is fitted onto a roll are prone to breakage because the mechanical strength of the ceramic sleeve itself is weak, and sufficient care must be taken during installation, which is an advantage of ceramics. There was a problem in that the build-up resistance was reduced.
次に、上記（３）に挙げたカーボンロールの場合は、高
温弱酸化性雰囲気から高温還元雰囲気のいずれの雰囲気
で使用されてもビルドアップの生成は比較的少ない。例
えば、特公昭４７−１３１６５号公報で提案された“Ｃ
ｒ、 Ｏｓを含浸したカーボンロール”は、弱酸化性雰
囲気中において良好なビルドアツプ性を示す。しかし、
Ｃｒ２Ｏ５含浸カーボンロールの使用温度は９００℃程
度で、それ以上の高温では酸化消耗が却って大きくなる
ので使用できない。Next, in the case of the carbon roll mentioned in (3) above, build-up is generated relatively little even if it is used in any atmosphere from a high-temperature weakly oxidizing atmosphere to a high-temperature reducing atmosphere. For example, the “C
"Carbon roll impregnated with r, Os" shows good build-up properties in a weakly oxidizing atmosphere.However,
The operating temperature of the Cr2O5-impregnated carbon roll is about 900°C, and it cannot be used at higher temperatures because the oxidation consumption becomes even greater.
また、カーボンロールは、非常に軟らかいことから、セ
ラミック溶射ロールと較べて耐摩耗性が劣っており、さ
らに連続焼鈍炉等で使用されるような大径ロール（φ８
００ ｎ以上）としては強度が不足するという問題点を
抱えていた。Furthermore, since carbon rolls are extremely soft, they have inferior wear resistance compared to ceramic spray rolls, and they are also used in large diameter rolls (φ8) used in continuous annealing furnaces.
00 n or more), the problem was that the strength was insufficient.
（発明が解決しようとする問題点）
上述した従来技術が抱えている欠点ならびに解決を必要
とする問題点に対し、本発明は、高温耐摩耗性とビルド
アップ防止効果に優れ、ロール基体との密着性に優れて
剥離することなく、かつ高温強度にも優れた高温鋼材用
搬送ロールを提供することを目的とする。(Problems to be Solved by the Invention) In order to solve the above-mentioned drawbacks of the prior art and problems that need to be solved, the present invention has excellent high-temperature abrasion resistance and build-up prevention effect, and a It is an object of the present invention to provide a conveyance roll for high-temperature steel material that has excellent adhesion, does not peel off, and has excellent high-temperature strength.
（問題点を解決するための手段）
上掲の目的に対し本発明は、その解決のために、ロール
表面の被覆層の主体を、Ｃｒ、Ｏ，を５θ〜８０ｖｏｌ
％含み、かつ残部がＭＣｒＡｌＹの組成式（ただし、Ｍ
は、Ｎｉ、 ＣｏおよびＣｏＮｉ合金を示す）で表され
る合金との混合物からなるサーメット溶射被覆層で構成
し、この溶射被覆層をＣｒｚＯｓで被覆すると共に該被
覆層に存在する気孔中にＣｒｚＯ，、を含浸充填するこ
とにより封孔してなるサーメット複合化被覆層としたこ
とを特徴とする高温鋼材用搬送ロール、
を提案する。(Means for Solving the Problems) In order to solve the above-mentioned object, the present invention mainly consists of Cr, O, and 5θ to 80 vol of the coating layer on the roll surface.
%, and the remainder is MCrAlY (however, M
is composed of a cermet thermally sprayed coating layer made of a mixture of Ni, Co and an alloy represented by CoNi alloy, and this thermally sprayed coating layer is coated with CrzOs and CrzO, We propose a conveyor roll for high-temperature steel material, characterized by having a cermet composite coating layer formed by impregnating and filling the pores with a cermet composite coating layer.
（作 用）
以下に、本発明におけるサーメット複合化被覆層が上記
のように限定される理由について詳細に説明する。(Function) Below, the reason why the cermet composite coating layer in the present invention is limited as described above will be explained in detail.
連続焼鈍炉などの高温雰囲気中に設置され、被処理鋼帯
を支持し搬送するのに用いられるハースロールは、その
基体は耐熱鋼で造られるのが普通である。The base of a hearth roll, which is installed in a high-temperature atmosphere such as a continuous annealing furnace and used to support and convey a steel strip to be processed, is usually made of heat-resistant steel.
本発明は、耐熱鋼製ロール基体に次のようにして複合化
被覆層を形成する。すなわち、まずロールの基体表面に
Ｃｒ、 Ｏ，を５０〜８０ ｖｏｌ％含み、かつ残部が
ＭＣｒＡｌＹの組成式（ただしＭはＮｉ、ＣｏおよびＣ
ｏＮｉ合金）で表される合金の混合物からなる酸化物サ
ーメットの溶射被覆層を０．０５〜３．０ｍｍ厚さで形
成する。引き続き、その溶射被覆層の上に、水溶性クロ
ム化合物の溶液を塗布した後、溶液中のＣｒＯ，ＩがＣ
ｒ、 ０．に化学変化するに充分な温度（２５０℃以上
、好ましくは５５０℃前後）にまで加熱し、その後常温
まで冷却する一連の処理（水溶性クロム化合物の溶液の
塗布−加熱−冷却）を１回もしくは２回以上施すことに
より、溶射被覆層の表面および該溶射被覆層中に存在す
る気孔中に酸化クロム（ＣｒｔＯ３）を被覆もしくは含
浸充填し、封孔すると共に、前記溶射被覆層と含浸充填
されたＣｒ、 Ｏ、が強固に結合したサーメット複合化
被覆層を形成する。In the present invention, a composite coating layer is formed on a roll base made of heat-resistant steel in the following manner. That is, first, the base surface of the roll contains 50 to 80 vol% of Cr, O, and the remainder has a composition formula of MCrAlY (where M is Ni, Co, and C).
A thermally sprayed coating layer of an oxide cermet made of a mixture of alloys represented by (oNi alloy) is formed to a thickness of 0.05 to 3.0 mm. Subsequently, after applying a solution of a water-soluble chromium compound on the thermal spray coating layer, CrO,I in the solution is converted to C.
r, 0. A series of treatments (application of a solution of a water-soluble chromium compound - heating - cooling) of heating to a temperature sufficient to cause a chemical change (250°C or higher, preferably around 550°C) and then cooling to room temperature is carried out once or By applying it two or more times, the surface of the thermal sprayed coating layer and the pores present in the thermal sprayed coating layer are coated or impregnated and filled with chromium oxide (CrtO3), and the pores are sealed. Forms a cermet composite coating layer in which Cr and O are strongly combined.
上記Ｃｒ、 Ｏ，は、一般に鉄系金属との濡れ性および
反応性が悪い材料として知られており、前記高温網帯搬
送ロールとしては耐ビルドアツプ性に優れるから好適な
材料と云える。しかしながら、Ｃｒ、 ０３単体の溶射
皮膜では、温度変動に対するフレキシビリティが悪くロ
ール基体との剥離が起こりやすく、高温熱処理炉用ハー
スロールとしては不向きであった。The above-mentioned Cr and O are generally known as materials with poor wettability and reactivity with iron-based metals, and can be said to be suitable materials for the high-temperature mesh belt conveying roll because they have excellent build-up resistance. However, the thermal spray coating of Cr, 03 alone has poor flexibility against temperature fluctuations and tends to peel off from the roll base, making it unsuitable for hearth rolls for high-temperature heat treatment furnaces.
そこで、本発明では、ＣｒｔＯ，の結合材として、ＭＣ
ｒＡｌＹなる組成式で表される合金を適量配合した溶射
被覆層とすると共にこの被覆層に対して水溶性クロム溶
液を塗布し焼成することとしたのである。その結果、化
学変化したＣｒ１ｅｓが前記溶射被覆層の気孔中に含浸
充填され、ひいては、該Ｃｒ２Ｏ．どうしが強固に結合
された状態のサーメット溶射皮膜が提供できるのである
。なお、ＭＣｒＡｌＹＣｏＮｉ合金は、ＭＣｒＡｌＹが
鉄系金属との反応性が悪く、耐熱性に優れていることと
ロール基体との密着性に優れていることによる。Therefore, in the present invention, MC is used as a binder for CrtO.
It was decided to form a thermally sprayed coating layer containing an appropriate amount of an alloy represented by the compositional formula rAlY, apply a water-soluble chromium solution to this coating layer, and then bake it. As a result, the chemically changed Cr1es is impregnated and filled into the pores of the thermally sprayed coating layer, and as a result, the Cr2O. This makes it possible to provide a cermet sprayed coating in which the cermets are firmly bonded together. Note that the MCrAlYCoNi alloy has poor reactivity with iron-based metals, has excellent heat resistance, and has excellent adhesion to the roll base.
なお、水溶性クロム溶液を溶射被覆層に塗布し焼成する
ことによって、溶射被覆層中の気孔中にＣｒ、 ０ 、
を含浸充填することによって封孔し、かつ該被覆層の表
面をＣｒｔＯ３で被覆する理由は、溶射被覆層の粒子間
結合を強力にすることと、耐ビルドアツプ性に優れたＣ
ｒ、 Ｏ、の特性を効果的に利用することにある。In addition, by applying a water-soluble chromium solution to the thermal spray coating layer and baking it, Cr, 0,
The reason for sealing the pores by impregnating and filling them with CrtO3 and coating the surface of the coating layer with CrtO3 is to strengthen the interparticle bonding of the thermal spray coating layer and to use CrtO3, which has excellent build-up resistance.
The objective is to effectively utilize the characteristics of r and O.
次に本発明者らは、上記サーメット被覆層の高温耐摩耗
性、ビルドアップ防止効果および耐熱衝撃性を調査した
。この調査は、表１に示す■〜■の配合比のＣｒ、 Ｏ
、とＣｏＮｉＣｒＡｌ Ｙ合金からなる溶射被覆材料を
２Ｏ．３ ｍ厚さに溶射被覆し、得られた溶射被覆層に
クロム酸水溶液を塗布した後５５０℃に加熱して水分を
蒸発させると共にＣｒＯ３をＣｒｔＯ、に変化させ、そ
の後冷却してサーメット複合化被覆層を形成した。この
ようにして得られたものについて種々の試験片を用意し
た。Next, the present inventors investigated the high-temperature abrasion resistance, build-up prevention effect, and thermal shock resistance of the cermet coating layer. This investigation was carried out using Cr, O at the mixing ratios of ■ to ■ shown in Table 1.
, and a CoNiCrAl Y alloy with 2O. Thermal spray coating was applied to a thickness of 3 m, and the resulting thermal spray coating layer was coated with a chromic acid aqueous solution, heated to 550°C to evaporate water and change CrO3 to CrtO, and then cooled to form a cermet composite coating. formed a layer. Various test pieces obtained in this way were prepared.
表 １
まず、高温摩耗試験は、直径１２０ｍｍ、胴長１００
ｍｌのＳＵＳ ３０４スリ一ブ状試験片を得て、この試
験片に９５０℃の還元雰囲気中、５０回転−１１時間、
ＩＯＸＩＯＸ５５ｍ＋＋のＳｉＣを１５ｋｇの荷重で接
触させるという状況の下で、そのときの摩耗度合いを調
査したものである。Table 1 First, the high temperature abrasion test was conducted with a diameter of 120 mm and a body length of 100 mm.
ml of SUS 304 sliver-shaped test piece was obtained, and this test piece was subjected to 50 rotations for 11 hours in a reducing atmosphere at 950°C.
The degree of wear was investigated under the condition that SiC of IOXIOX 55m++ was brought into contact with a load of 15 kg.
また、ビルドアツプ性試験は、５０ Ｘ ３０ｍ１ 、
厚み１０１１のＳＯ５３０４平板を使用した。試験片を
各々２枚づつ組合せてその対向面にビルドアップ原料で
ある鉄酸化物粉末をのせて重ね合わせ、その上に８ ｋ
ｇ／ｃｍ２の荷重を加え、さらにビルドアップ原料と２
枚の試験片をこすり合わせるように設定して行うもので
ある。この試験装置は雰囲気制御可能な電気炉中に設定
する。なお、このビルドアツプ性試験は、雰囲気温度９
５０℃、Ｈ（５％）−Ｎ２（９５％）雰囲気で４時間行
った。試験後、試料を取り出してビルドアップを発生し
ている部分の面積を画像解析装置を用いて測定した。ビ
ルドアップ発生率はビルドアップ面積の割合をもって示
した。表２に、高温摩耗試験およびビルドアツプ性試験
の結果を示した。In addition, the build-up test was performed using 50 x 30 m1,
An SO5304 flat plate with a thickness of 1011 mm was used. Two test pieces each were assembled, and iron oxide powder, which is a build-up raw material, was placed on the opposite side of the test pieces.
A load of g/cm2 is applied, and the build-up raw material and 2
This is done by rubbing two test pieces together. This test equipment is set up in an electric furnace where the atmosphere can be controlled. This build-up test was conducted at an ambient temperature of 9.
The test was carried out at 50° C. for 4 hours in a H (5%)-N2 (95%) atmosphere. After the test, the sample was taken out and the area of the part where buildup was occurring was measured using an image analysis device. The buildup incidence rate was expressed as a percentage of the buildup area. Table 2 shows the results of the high temperature abrasion test and build-up test.
耐熱衝撃試験は、１００ Ｘ １００ Ｘ ２０ｍの耐
熱鋼を使用した試験片を、電気炉で１１００℃まで加熱
した後水冷する操作を剥離するまで繰り返すことにより
行った。その結果を第１図に示す。The thermal shock resistance test was conducted by heating a 100 x 100 x 20 m test piece made of heat-resistant steel in an electric furnace to 1100°C and then cooling it with water repeatedly until it peeled off. The results are shown in FIG.
以上の試験結果から、本発明で用いるサーメット溶射材
料について、Ｃｒ２Ｏ，の添加量の下限が５０ｖｏｌ％
未満になると、ビルドアップの発生量および摩耗量が増
大し、使用に耐えなくなることが判った。一方、その量
が多くなると耐剥離性が低下するので、上限は８０ ｖ
ｏｌ％とした。From the above test results, the lower limit of the amount of Cr2O added to the cermet thermal spray material used in the present invention is 50 vol%.
It has been found that if it is less than that, the amount of build-up and wear increases, making it unusable. On the other hand, as the amount increases, the peeling resistance decreases, so the upper limit is 80 V.
It was set as ol%.
また、溶射被覆層の剥離を防止するために採用したサー
メット中の結合材、すなわちＭＣｒＡ］Ｙ合金は、２０
ｖｏｌ％以上、好ましくは３０ ｖｏｌ％以上とする
ことが必要であることが確認された。In addition, the binder in the cermet, that is, the MCrA]Y alloy used to prevent the peeling of the thermally sprayed coating layer, is
It was confirmed that it is necessary to set the content to vol% or more, preferably 30 vol% or more.
なお、本発明ロール表面に形成するサーメット複合化被
覆層は、その厚さが０．０５ｍ１より薄いと皮膜が摩耗
した場合に被覆層の効果がなくなり、種々の高温特性が
減殺される。一方、該被覆層厚が３．０額より厚くなる
と層内に応力が蓄積されて素材から剥離しやすくなるの
で、被覆層の厚さとしては０．０５１１〜３．０鰭の範
囲内が好ましい。If the thickness of the cermet composite coating layer formed on the roll surface of the present invention is thinner than 0.05 m1, the effect of the coating layer will be lost when the coating is worn, and various high-temperature properties will be diminished. On the other hand, if the thickness of the coating layer becomes thicker than 3.0 fins, stress will accumulate in the layer and it will easily peel off from the material, so the thickness of the coating layer is preferably within the range of 0.0511 to 3.0 fins. .
なお、上述した本発明にかかる高温鋼材用搬送ロールは
、例示した冷延鋼板の連続焼鈍炉に限らず、めっき鋼板
や電磁鋼板等の焼鈍炉、あるいは棒鋼やパイプ等の焼鈍
炉で使用する場合にも有効である。Note that the above-described conveyor roll for high-temperature steel according to the present invention is not limited to the continuous annealing furnace for cold-rolled steel sheets as exemplified, but can also be used in annealing furnaces for plated steel sheets, electromagnetic steel sheets, etc., or in annealing furnaces for steel bars, pipes, etc. It is also effective for
耐熱鋼製ロール表面に、ＣｒｚＯ，、５０ｖｏｌ％とＣ
ｏＣｒＡＩＹ合金５０ｖｏｌ％からなるサーメット溶射
材料と、Ｃｒ２０３８０ ｖｏｌ％とＮｌＣｒＡＩＹ合
金２０ｖｏｌ％からなるサーメット溶射材料を２Ｏ．４
鰭厚さに溶射被覆し、得られたそれら溶射被覆層にクロ
ム酸水溶液を塗布した後５５０℃に加熱して水分を蒸発
させると共にＣｒＯ＋をＣｒｚＯ３に変化させ、その後
冷却してサーメット複合化被覆層を形成した。このよう
にして得られた２本のハースロールを、冷延鋼板用連続
焼鈍炉の均熱帯に組み込み、実操業に使用したところ、
本発明にかかる上記ハースロールは、２年間の継続使用
においてさえも前記サーメット複合化被覆層には摩耗や
ビルドアップ等、何らの変化も認められなかった。これ
は従来の耐熱鋼およびＡＩｚＯｉ系表面被系材面被覆材
料た既存のハースロールに較べ数倍の耐用時間を示すも
のである。CrzO, 50 vol% and C on the surface of the heat-resistant steel roll.
A cermet thermal spray material consisting of 50 vol% oCrAIY alloy and a cermet thermal spray material consisting of 20380 vol% Cr and 20 vol% NlCrAIY alloy were mixed into 2O. 4
Thermal spray coating is applied to the fin thickness, and the resulting thermal spray coating layer is coated with a chromic acid aqueous solution, heated to 550°C to evaporate water and convert CrO+ to CrzO3, and then cooled to form a cermet composite coating layer. was formed. When the two hearth rolls obtained in this way were installed in the soaking zone of a continuous annealing furnace for cold-rolled steel sheets and used in actual operation,
In the hearth roll according to the present invention, no changes such as wear or build-up were observed in the cermet composite coating layer even after two years of continuous use. This shows a service life several times longer than existing hearth rolls made of conventional heat-resistant steel and AIzOi-based surface coating materials.
（発明の効果）
以上の接触ならびに冷却の結果かられかるように、本発
明によれば、高温耐摩耗性ならびにビルドアップ防止効
果に優れると共にロール基体との密着性に優れ、さらに
高温強度にも優れた特性を示す高温鋼材用搬送ロールと
することができる。(Effects of the Invention) As can be seen from the above contact and cooling results, the present invention has excellent high-temperature wear resistance and build-up prevention effects, excellent adhesion to the roll base, and even high-temperature strength. It can be made into a conveyor roll for high-temperature steel materials that exhibits excellent properties.
第１図は、ＣｏＮｉＣｒＡｌ Ｙ合金添加量と剥離まで
の回数との関係を示すグラフである。
特許出願人 新日本製鐵株式会社
同 トーカロ株式会社FIG. 1 is a graph showing the relationship between the amount of CoNiCrAl Y alloy added and the number of times until peeling. Patent applicant: Nippon Steel Corporation Tocalo Co., Ltd.
Claims (1)
０〜８０ｖｏｌ％含み、かつ残部がＭＣｒＡｌＹの組成
式（ただし、Ｍは、Ｎｉ、ＣｏおよびＣｏＮｉ合金を示
す）で表される合金との混合物からなるサーメット溶射
被覆層で構成し、この溶射被覆層をＣｒ＿２Ｏ＿３で被
覆すると共に該被覆層に存在する気孔中にＣｒ＿２Ｏ＿
３を含浸充填することにより封孔してなるサーメット複
合化被覆層としたことを特徴とする高温鋼材用搬送ロー
ル。1. The main body of the coating layer on the roll surface is Cr_2O_3.
0 to 80 vol%, and the remainder is composed of a cermet sprayed coating layer consisting of a mixture with an alloy represented by the composition formula of MCrAlY (where M represents Ni, Co and CoNi alloy), and this thermal sprayed coating layer is coated with Cr_2O_3, and Cr_2O_
1. A conveying roll for high-temperature steel material, characterized in that the cermet composite coating layer is formed by impregnating and filling the cermet composite coating layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27825987A JPH01122611A (en) | 1987-11-05 | 1987-11-05 | Carrying roll for high temperature steel material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27825987A JPH01122611A (en) | 1987-11-05 | 1987-11-05 | Carrying roll for high temperature steel material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01122611A true JPH01122611A (en) | 1989-05-15 |
Family
ID=17594845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27825987A Pending JPH01122611A (en) | 1987-11-05 | 1987-11-05 | Carrying roll for high temperature steel material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01122611A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003340512A (en) * | 2002-05-22 | 2003-12-02 | Nippon Steel Hardfacing Co Ltd | Undriven roll |
| JP2006307296A (en) * | 2005-04-28 | 2006-11-09 | Sumitomo Metal Ind Ltd | Method for continuously heat-treating metallic strip and horizontal continuous heat treating furnace |
| JP2010253510A (en) * | 2009-04-24 | 2010-11-11 | Ihi Corp | Conveying role, conveying apparatus and hot-rolling apparatus |
| JP2011006729A (en) * | 2009-06-24 | 2011-01-13 | Jfe Steel Corp | Hearth roll and manufacturing method therefor |
-
1987
- 1987-11-05 JP JP27825987A patent/JPH01122611A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003340512A (en) * | 2002-05-22 | 2003-12-02 | Nippon Steel Hardfacing Co Ltd | Undriven roll |
| JP2006307296A (en) * | 2005-04-28 | 2006-11-09 | Sumitomo Metal Ind Ltd | Method for continuously heat-treating metallic strip and horizontal continuous heat treating furnace |
| JP2010253510A (en) * | 2009-04-24 | 2010-11-11 | Ihi Corp | Conveying role, conveying apparatus and hot-rolling apparatus |
| JP2011006729A (en) * | 2009-06-24 | 2011-01-13 | Jfe Steel Corp | Hearth roll and manufacturing method therefor |
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