JP4229508B2 - High temperature hearth roller - Google Patents
High temperature hearth roller Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、高温の連続焼鈍炉内に設置されて鋼板などの搬送に用いられる搬送用ローラー(ハースローラー)に係り、更にくわしくは、800℃以上でもビルドアップの発生がすくなく、かつ耐用寿命の長いハースローラーに係るものである。
【０００２】
【従来の技術】
鋼板などの焼鈍には、炉内にハースローラーを設置した連続焼鈍炉が使用されている。熱処理温度は600〜1200℃、雰囲気は弱酸化ないしは還元雰囲気で、ローラーはかかる温度・雰囲気で回転しながら鋼板と接触している。したがってローラー表面は摩耗しやすく、かつ鋼板の表面に付着した酸化物や鉄粉が表面に固着して、いわゆるビルドアップと称せられる現象が発生する。
【０００３】
ビルドアップを防止するために、表面にセラミックをコーティングしたローラーが提案されている(特開昭６４−２５８)。特開昭６４−２５８号に開示されたローラーではビルドアップの発生は大幅に抑制できるが、皮膜はもろく、熱衝撃で剥離する欠点を有していた。
特開昭６０−１４８６１号に提案されている耐熱合金皮膜は耐剥離性は優れているが、ビルドアップの抑制は満足できるものではない。
又ビルドアップの発生しにくい皮膜形成材料として下記に示すサーメット材料が提案され実用に供されている。
1) ５〜20％のＣｒ2Ｏ3・Ａｌ2Ｏ3とＣｏＮｉＣｒＡｌＹからなる溶射材料
(特開平２−２７０９５５)
2) 51〜95ｖｏｌ％のＡｌ2Ｏ3とＭＣｒＡｌＹ(ＭはＦｅ，Ｎｉ，Ｃｏ)
(特開昭６３−１９９８５７)
3) 30〜80％のＺｒＳｉＯ4と、ＭＣｒＡｌＹ(ＭはＦｅ，Ｎｉ，Ｃｏ)に加えて
クロム酸化学緻密化処理(特開昭６３−４７３７９)
4) 40％ＳiＯ2とＭＣｒＡｌＹ(ＭはＦｅ，Ｎｉ，Ｃｏ)
(特開昭６３−４７３７９)
5) Ａｌ2Ｏ3・ＭｇＯを最上層とするＡｌ2Ｏ3・ＭｇＯ＋結合金属の多層皮膜
（特開昭６０−５６０５８）
【０００４】
上述のように各種サーメットが被覆されるようになってハースローラーの課題の多くは解決されてきた反面、又新たな問題も起こってきた。
それは、近年800℃以上の高温で使用されるＣＡＬやＣＧＬと称せられる一部の製造ラインのハースローラーでは、鋼板表面の酸化マンガンとローラー表面の溶射皮膜の耐熱合金が反応して皮膜が劣化し、ローラーの耐摩耗性と耐ビルドアップ性が低下して寿命が著しく低下する問題である。
【０００５】
【発明が解決ようとする課題】
本発明はかかる問題に鑑みてなされたもので、その目的は、上記したＣＡＬやＣＧＬ等の800℃以上の高温のラインで使用しても耐摩耗性と耐ビルドアップ性の低下の少ない皮膜を被覆したハースローラーを提供せんとするものである。
【０００６】
【課題を解決するための手段】
本発明者らは上記問題に関して鋭意研究を行った結果、次の知見を得た。
すなわち、800℃以上の高温で鋼板表面の酸化マンガンとハースローラーの皮膜の中のクロムが反応して、反応生成物(複合酸化物)を生成し、これが皮膜の劣化をもたらすことがわかった。
本発明は以上の知見をもとになされたもので、次の構成からなる。
(1) ハースローラーの外周面に耐熱合金粉末と酸化物セラミック粉末が混合された組成の溶射材料が溶射された構造からなり、該耐熱合金粉末の組成が、
炭素：0〜２質量％、Ｃｒ：0〜10質量％、Ｃｏ及び／又はＮｉ：66〜70質量％、
Ａｌ：８〜15質量％、Ｗ，Ｍｏ，Ｔａ，Ｎｂ，Ｆｅから選ばれた１種又は２種以
上の元素：計10 〜 15 質量％
であって、これら各成分の合計が 100 質量％になり、該酸化物セラミック粉末は、該合金粉末100質量部に対して10〜70質量部の割合で混合された組成からなることを特徴とする高温ハースローラー。
(2) 上記セラミックが、Ｙ2Ｏ3，ＺｒＯ2−ＣａＯ，ＺｒＯ2−Ｙ2Ｏ3，Ａｌ2Ｏ3，ＺｒＯ2−Ａｌ2Ｏ3の中から選ばれた１種または２種以上のセラミックである(1)に記載の高温ハースローラー。
【０００７】
【発明の実施の形態】
高温域（800℃以上）では、上述のように酸化マンガンと溶射皮膜内のクロムが反応して複合酸化物を生成し、これが皮膜を劣化させる原因と考えられる。クロムは耐酸化性と耐鉄付着性には有益な元素であるが、酸化マンガンとの耐反応性に劣るので、10％以下が好ましい。10％を超えると酸化マンガンとの反応によって皮膜が劣化して寿命が低下する。
アルミニウムは皮膜表面にアルミナ系の安定した酸化膜を形成し、耐酸化性と耐鉄付着性には極めて有益で、かつ酸化マンガンとの耐反応性にも優れた元素であり、８〜50％の添加が好ましい。８％未満では十分な効果が得られない。
また、50％を超えると合金の融点が下がり、耐熱性が低下するので好ましくない。
Ｗ，Ｍｏ，Ｎｂ，Ｔａ，Ｆｅは、合計で20％までの添加は皮膜の硬度向上に効果があるが、20％を超えると耐酸化性が劣ってくるので好ましくない。
酸化物は、耐摩耗性と酸化マンガンに対する耐反応性を向上させるのに必須の成分であり、合金粉末100部に対して10〜70部の割合で混合するのが好ましい。
70部を超えると熱衝撃で剥離するようになるので好ましくない。
10部未満では、十分な効果が得られない。
本発明で使用する酸化物セラミックは、酸化マンガンに反応し難く、かつ耐熱、耐摩耗性に優れたＹ2Ｏ3，ＺｒＯ2−ＣａＯ,ＺｒＯ2−Ｙ2Ｏ3，Ａｌ2Ｏ3，ＺｒＯ2−Ａｌ2Ｏ3等のセラミックが好ましい。
【０００８】
これらの溶射粉末は、プラズマ溶射ガン、高速燃焼炎溶射ガン，爆発溶射ガンなどを単独使用あるいは適宜併用することにより好適に溶射できる。
溶射皮膜の厚さは、概ね50〜300μmの範囲が好ましい。
300μmを超える膜厚は、皮膜の剥離を引き起こす。
50μm未満では、十分な耐久性が得られない。
【０００９】
（実施例）
実施例1（耐ビルドアップ性のテスト)
試験片の材質：ＳＵＳ３０４
寸法：50×50×10mm厚
上記試験片の片面に下記表1の▲１▼〜▲５▼の組成の溶射粉末を200μm厚さに溶射した。
また比較材として、耐熱合金の組成が本発明の範囲から外れる組成の溶射粉末を溶射した試料を4種類および従来から使用されているサーメット系材料を溶射した試料３種類を作製した。
【００１０】
試験片は３枚ずつ作製し、1枚は酸化マンガンとの反応性のテスト、１枚は鉄粉の付着性のテスト、１枚は実施例２で行う熱衝撃テストに使用した。
酸化マンガンとの反応性のテスト、鉄粉の付着性のテストは、いずれも研磨した溶射膜の上に酸化マンガンの粉末または鉄粉を載せ、実用炉と同じ雰囲気（２％Ｈ２＋Ｎ２雰囲気）中、1000℃で100時間加熱した。
試験後、皮膜表面の付着状況を観察するとともに、試験片を切断して切断面の顕微鏡観察を行い、酸化マンガンとの反応性および鉄粉の付着性を調べた。
本発明の溶射材料の試験結果は表２に、比較例の結果は表３に示す。
なお、溶射粉末としては耐熱合金の粉末と酸化物セラミックの粉末を表１に記した割合で混合したものを使用した。酸化物セラミックの混合割合は耐熱金属100部に対する割合である。
【００１１】
【表１】
【表２】
【表３】
以上の結果より、本発明例の溶射皮膜は、比較例のものに比べて酸化マンガンとの反応、鉄粉の付着に対して強い抵抗性を有していることが確認できた。
【００１５】
実施例２（皮膜の耐熱衝撃性テスト）
実施例1で作製した試験片について耐熱衝撃性テストを行った。
条件：
1000℃の温度から水冷を繰返す。
ワレが発生するまでの回数で評価した。
結果
本発明例の試験片▲１▼〜▲５▼はいずれも20回までワレが発生しなかった。
このように、本発明例試験片は、耐熱衝撃性においても満足な性能を有することが確認できた。
【００１６】
実施例３
直径900mm，長さ4600mmの鉄鋼の連続焼鈍炉のハースローラーに本発明例▲１▼の組成の溶射材料を200μm溶射し、研磨仕上げした後、連続焼鈍炉の中に取り付けて、２％Ｈ2＋Ｎ2雰囲気中、1000℃で使用し、500時間経過後、1000時間経過後の表面状況を調べた。
500時問後、1000時間後、いずれも表面は平滑で皮膜の剥離もなく、酸化マンガン、鉄粉の付着はなかった。
一方、従来から使用されているサーメット系材料（ＮｉＣｒＡｌＹ100部＋アルミナ11部）を溶射したものでは、酸化マンガンとの反応によって表面が激しく荒らされ、鉄粉も固着していた。
【００１７】
【発明の効果】
以上詳記したように、本発明は、酸化マンガンに対する耐反応性と鉄粉の耐付着性に極めて優れたハースローラーを提供したものである。即ち、本発明ローラーを用いた連続炉においては、ローラーへのビルドアップに起因する通板材表面品質の不具合あるいはこれを避けるための手数のかヽかるハースローラー交換の頻度が大巾に低減するものであり、品質，コストの両面に亘る本発明の貢献が絶大である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transfer roller (Heath roller) that is installed in a high-temperature continuous annealing furnace and used to transfer steel sheets and the like, and more specifically, build-up does not easily occur even at 800 ° C. or higher and has a long service life. It concerns a long hearth roller.
[0002]
[Prior art]
For annealing steel sheets, a continuous annealing furnace having a hearth roller installed in the furnace is used. The heat treatment temperature is 600 to 1200 ° C., the atmosphere is a weak oxidizing or reducing atmosphere, and the roller is in contact with the steel plate while rotating at such temperature and atmosphere. Therefore, the roller surface is easily abraded, and oxides or iron powders adhered to the surface of the steel sheet adhere to the surface, and a phenomenon called so-called build-up occurs.
[0003]
In order to prevent buildup, a roller whose surface is coated with ceramic has been proposed (Japanese Patent Laid-Open No. 64-258). The roller disclosed in Japanese Patent Application Laid-Open No. 64-258 can greatly suppress the build-up, but the film is brittle and has the disadvantage of peeling off by thermal shock.
Although the heat resistant alloy film proposed in Japanese Patent Application Laid-Open No. 60-14861 has excellent peel resistance, the suppression of buildup is not satisfactory.
Further, the following cermet materials have been proposed and put into practical use as film-forming materials that are unlikely to cause buildup.
1) Thermal spray material consisting of 5-20% Cr 2 O 3 .Al 2 O 3 and CoNiCrAlY
(JP-A-2-270955)
2) 51~95vol% of Al 2 O 3 and MCrAlY (M is Fe, Ni, Co)
(Japanese Patent Laid-Open No. 63-199857)
3) Chromic acid chemical densification treatment in addition to 30-80% ZrSiO 4 and MCrAlY (M is Fe, Ni, Co) (JP-A-63-47379)
4) 40% SiO 2 and MCrAlY (M is Fe, Ni, Co)
(Japanese Patent Laid-Open No. 63-47379)
5) Al 2 O 3 · MgO + multi-layer coating of Al 2 O 3 · MgO + binding metal with Al 2 O 3 · MgO as the uppermost layer
[0004]
While various cermets have been coated as described above, many of the problems of the hearth roller have been solved, but new problems have also occurred.
In the hearth roller of some production lines called CAL and CGL used at high temperatures of 800 ° C or higher in recent years, the coating deteriorates due to the reaction between manganese oxide on the steel plate surface and the heat-resistant alloy of the sprayed coating on the roller surface. This is a problem that the wear resistance and build-up resistance of the roller are lowered and the service life is remarkably reduced.
[0005]
[Problem to be Solved by the Invention]
The present invention has been made in view of such problems, and its purpose is to form a film with little deterioration in wear resistance and build-up resistance even when used in a high-temperature line of 800 ° C. or higher such as CAL or CGL. It is intended to provide a coated hearth roller.
[0006]
[Means for Solving the Problems]
As a result of intensive studies on the above problems, the present inventors have obtained the following knowledge.
In other words, it was found that manganese oxide on the steel sheet surface and chromium in the hearth roller film react at a high temperature of 800 ° C. or more to produce a reaction product (composite oxide), which causes the film to deteriorate.
The present invention has been made on the basis of the above knowledge and has the following configuration.
(1) thermal spray material composition oxide ceramic powder and heat resistant alloy powder on the outer circumferential surface of the hearth rollers are mixed is made of sprayed structure, the assembled configuration of the end heat-resistant alloy powder,
Carbon: 0-2 wt%, Cr: 0 wt%, Co and / or Ni: 66-70 wt%,
Al: 8 to 15% by mass, one or more elements selected from W, Mo, Ta, Nb, and Fe: 10 to 15 % by mass in total
The total of these components is 100 % by mass, and the oxide ceramic powder has a composition mixed at a ratio of 10 to 70 parts by mass with respect to 100 parts by mass of the alloy powder. High temperature hearth roller.
(2) The ceramic is one or more selected from Y 2 O 3 , ZrO 2 —CaO, ZrO 2 —Y 2 O 3 , Al 2 O 3 , ZrO 2 —Al 2 O 3 . The high-temperature hearth roller according to (1), which is ceramic.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In a high temperature range (800 ° C. or higher), manganese oxide and chromium in the sprayed coating react to form a composite oxide as described above, which is considered to cause the coating to deteriorate. Chromium is an element useful for oxidation resistance and iron adhesion, but is inferior in resistance to manganese oxide, so 10% or less is preferable. If it exceeds 10%, the film deteriorates due to the reaction with manganese oxide and the life is shortened.
Aluminum forms an alumina-based stable oxide film on the surface of the film, and is an element that is extremely beneficial for oxidation resistance and iron adhesion, and excellent in resistance to manganese oxide, and is 8 to 50%. Is preferable. If it is less than 8%, a sufficient effect cannot be obtained.
On the other hand, if it exceeds 50%, the melting point of the alloy is lowered and the heat resistance is lowered.
Addition of up to 20% of W, Mo, Nb, Ta, and Fe is effective in improving the hardness of the film, but if over 20%, the oxidation resistance is inferior, which is not preferable.
The oxide is an essential component for improving wear resistance and resistance to manganese oxide, and is preferably mixed at a ratio of 10 to 70 parts with respect to 100 parts of the alloy powder.
If it exceeds 70 parts, it will be peeled off by thermal shock.
If it is less than 10 parts, sufficient effects cannot be obtained.
The oxide ceramic used in the present invention does not easily react with manganese oxide, and has excellent heat resistance and wear resistance. Y 2 O 3 , ZrO 2 —CaO, ZrO 2 —Y 2 O 3 , Al 2 O 3 , ZrO A ceramic such as 2- Al 2 O 3 is preferred.
[0008]
These spray powders can be suitably sprayed by using a plasma spray gun, a high-speed combustion flame spray gun, an explosion spray gun or the like alone or in combination as appropriate.
The thickness of the sprayed coating is preferably in the range of approximately 50 to 300 μm.
A film thickness exceeding 300 μm causes peeling of the film.
If it is less than 50 μm, sufficient durability cannot be obtained.
[0009]
(Example)
Example 1 (Test for build-up resistance)
Specimen material: SUS304
Size: 50 × 50 × 10 mm thickness Sprayed powder of the composition of (1) to (5) in Table 1 below was sprayed to a thickness of 200 μm on one side of the above test piece.
In addition, as a comparative material, four types of samples sprayed with a thermal spray powder having a composition of a heat resistant alloy deviating from the scope of the present invention and three types of samples sprayed with a cermet-based material conventionally used were prepared.
[0010]
Three test pieces were prepared, one for the reactivity test with manganese oxide, one for the iron powder adhesion test, and one for the thermal shock test performed in Example 2.
In both the reactivity test with manganese oxide and the iron powder adhesion test, manganese oxide powder or iron powder was placed on the polished sprayed film, and in the same atmosphere as a practical furnace (2% H2 + N2 atmosphere) Heated at 1000 ° C. for 100 hours.
After the test, the adhesion state of the coating surface was observed, the test piece was cut and the cut surface was observed with a microscope, and the reactivity with manganese oxide and the adhesion of iron powder were examined.
Table 2 shows the test results of the thermal spray material of the present invention, and Table 3 shows the results of the comparative example.
As the thermal spraying powder, a mixture of a heat-resistant alloy powder and an oxide ceramic powder in the proportions shown in Table 1 was used. The mixing ratio of the oxide ceramic is a ratio with respect to 100 parts of the refractory metal.
[0011]
[Table 1]
[Table 2]
[Table 3]
From the above results, it was confirmed that the thermal spray coating of the present invention example had stronger resistance to the reaction with manganese oxide and the adhesion of iron powder than the comparative example.
[0015]
Example 2 (thermal shock resistance test of film)
The test piece produced in Example 1 was subjected to a thermal shock resistance test.
conditions:
Repeat water cooling from a temperature of 1000 ° C.
Evaluation was made by the number of times until cracking occurred.
Results In all of the test pieces (1) to (5) of the inventive example, cracking did not occur up to 20 times.
As described above, it was confirmed that the test piece of the present invention had satisfactory performance in terms of thermal shock resistance.
[0016]
Example 3
After spraying 200 μm of the thermal spray material of the composition of the present invention example (1) onto a hearth roller of a continuous annealing furnace of steel with a diameter of 900 mm and a length of 4600 mm, it was polished and mounted in a continuous annealing furnace, and 2% H 2 It was used at 1000 ° C. in a + N 2 atmosphere, and after 500 hours, the surface condition after 1000 hours was examined.
After 500 hours and after 1000 hours, the surface was smooth and there was no peeling of the film, and there was no adhesion of manganese oxide or iron powder.
On the other hand, when the conventional cermet material (NiCrAlY 100 parts + alumina 11 parts) is sprayed, the surface is severely damaged by the reaction with manganese oxide, and the iron powder is fixed.
[0017]
【The invention's effect】
As described in detail above, the present invention provides a hearth roller that is extremely excellent in the resistance to manganese oxide and the adhesion resistance of iron powder. That is, in the continuous furnace using the roller of the present invention, the frequency of the hearth roller replacement, which is troublesome to avoid the defect of the sheet material surface quality due to the build-up to the roller or the trouble, is greatly reduced. The contribution of the present invention over both quality and cost is tremendous.
Claims (2)
炭素：0〜２質量％、Ｃｒ：0〜10質量％、Ｃｏ及び／又はＮｉ：66〜70質量％、
Ａｌ：８〜15質量％、Ｗ，Ｍｏ，Ｔａ，Ｎｂ，Ｆｅから選ばれた１種又は２種以
上の元素：計10 〜 15 質量％
であって、これら各成分の合計が 100 質量％になり、該酸化物セラミック粉末は、該合金粉末100質量部に対して10〜70質量部の割合で混合された組成からなることを特徴とする高温ハースローラー。Consists spray material having a composition oxide ceramic powder and heat resistant alloy powder on the outer circumferential surface of the hearth rollers are mixed is sprayed structure, the assembled configuration of the end heat-resistant alloy powder,
Carbon: 0-2 wt%, Cr: 0 wt%, Co and / or Ni: 66-70 wt%,
Al: 8 to 15% by mass, one or more elements selected from W, Mo, Ta, Nb, and Fe: 10 to 15 % by mass in total
The total of these components is 100 % by mass, and the oxide ceramic powder has a composition mixed at a ratio of 10 to 70 parts by mass with respect to 100 parts by mass of the alloy powder. High temperature hearth roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02107899A JP4229508B2 (en) | 1999-01-29 | 1999-01-29 | High temperature hearth roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02107899A JP4229508B2 (en) | 1999-01-29 | 1999-01-29 | High temperature hearth roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000219911A JP2000219911A (en) | 2000-08-08 |
| JP4229508B2 true JP4229508B2 (en) | 2009-02-25 |
Family
ID=12044861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02107899A Expired - Fee Related JP4229508B2 (en) | 1999-01-29 | 1999-01-29 | High temperature hearth roller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4229508B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191448A (en) * | 2010-03-12 | 2011-09-21 | 宝山钢铁股份有限公司 | Metal ceramic powders used for thermal spraying on furnace roller surface |
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| IT1317891B1 (en) * | 2000-08-04 | 2003-07-15 | Ct Sviluppo Materiali Spa | COMPOSITION FOR HIGH RESISTANCE ELEMENTS, IN PARTICULAR INTENDED FOR HOT WEAR AND THERMAL FATIGUE, ROLLERS COATED WITH |
| JP4774786B2 (en) * | 2005-03-31 | 2011-09-14 | Ｊｆｅスチール株式会社 | Thermal spray coating for furnace structure coating and method for forming the same |
| JP5296299B2 (en) * | 2006-06-01 | 2013-09-25 | 日鉄住金ハード株式会社 | Hearth roll with excellent Mn build-up resistance and thermal shock resistance. |
| WO2009150867A1 (en) * | 2008-06-10 | 2009-12-17 | 日鉄ハード株式会社 | Thermal spraying material and hearth roll |
| BRPI0909979A2 (en) * | 2008-06-10 | 2015-10-27 | Nippon Steel Hardfacing | heating roller and thermal spray material |
| JP2010253510A (en) * | 2009-04-24 | 2010-11-11 | Ihi Corp | Conveying role, conveying apparatus and hot-rolling apparatus |
| US20170037498A1 (en) * | 2014-04-16 | 2017-02-09 | Indian Institute Of Science | Gamma - gamma prime strengthened tungsten free cobalt-based superalloy |
| WO2023277063A1 (en) * | 2021-06-30 | 2023-01-05 | Ｊｆｅスチール株式会社 | Coating material for in-furnace structure, surface coating method, and in-furnace structure |
-
1999
- 1999-01-29 JP JP02107899A patent/JP4229508B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191448A (en) * | 2010-03-12 | 2011-09-21 | 宝山钢铁股份有限公司 | Metal ceramic powders used for thermal spraying on furnace roller surface |
| CN102191448B (en) * | 2010-03-12 | 2013-04-24 | 宝山钢铁股份有限公司 | Metal ceramic powders used for thermal spraying on furnace roller surface |
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| Publication number | Publication date |
|---|---|
| JP2000219911A (en) | 2000-08-08 |
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