JPH05473B2 - - Google Patents
Info
- Publication number
- JPH05473B2 JPH05473B2 JP19154586A JP19154586A JPH05473B2 JP H05473 B2 JPH05473 B2 JP H05473B2 JP 19154586 A JP19154586 A JP 19154586A JP 19154586 A JP19154586 A JP 19154586A JP H05473 B2 JPH05473 B2 JP H05473B2
- Authority
- JP
- Japan
- Prior art keywords
- coating layer
- roll
- furnace
- heat
- spray coating
- 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
- 239000011247 coating layer Substances 0.000 claims description 32
- 239000011651 chromium Substances 0.000 claims description 20
- 229910045601 alloy Inorganic materials 0.000 claims description 16
- 239000000956 alloy Substances 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 15
- 229910052804 chromium Inorganic materials 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000011195 cermet Substances 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 12
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 10
- 229910006501 ZrSiO Inorganic materials 0.000 claims description 10
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 229910052715 tantalum Inorganic materials 0.000 claims description 7
- 229910052727 yttrium Inorganic materials 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 150000001845 chromium compounds Chemical class 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 description 8
- 150000002739 metals Chemical class 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 238000007751 thermal spraying Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- -1 Ta and Y Chemical class 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 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 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1225—Deposition of multilayers of inorganic material
-
- 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
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
- C23C18/1208—Oxides, e.g. ceramics
- C23C18/1216—Metal oxides
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Metallurgy (AREA)
- Ceramic Engineering (AREA)
- Chemically Coating (AREA)
- Coating By Spraying Or Casting (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
〔産業上の利用分野〕
本発明は連続熱処理炉内に配設され、ストリツ
プを搬送するためのロールであつて、特に高温強
度、高温耐摩耗性と耐ビルドアツプ性に優れた炉
内ロールおよびその製造方法に関する。
〔従来の技術〕
従来、この種の溶射被覆した熱処理炉の炉内ロ
ールとしては、
(1) 耐熱合金製ロール表面にCo、Cr、Ni、Al、
等の耐熱金属または合金を溶射被覆した炉内ロ
ール、
(2) 耐熱合金製ロール表面にCrC、Cr2O3等のセ
ラミツクスとCo、Ni、Cr等の金属又は合金か
ら成るサーメツトを溶射被覆した炉内ロール、
(3) 耐熱合金製ロール表面にAl2O3、ZrO2、SiO2
等のセラミツクスを溶射被覆した炉内ロール、
等が考案され、使用されている。
しかし、これらはいずれも炉内ロールにおいて
希望する特性をすべて満足するに至つていない。
即ち、Co、Cr、Ni、Al等の耐熱金属または合金
を溶射被覆した炉内ロールや、CrC、Cr2O3等の
セラミツクスとCo、Cr、Ni等の金属からなるサ
ーメツトを溶射した炉内ロールにおいては耐摩耗
性及び耐剥離性に優れているが、凝着堆積に起因
するビルドアツプの発生防止には効果が薄い。
さらに、Al2O3、ZrO2等のセラミツクスを溶射
被覆した炉内ロールにおいては、セラミツクスの
熱膨張係数が母材金属に比べて小さく熱処理炉の
急速な昇温あるいは炉温変化を生じた場合、スポ
ーリング性破壊や、クラツクの発生による耐用性
の低下を起こす。また特開昭59−70712号公報等
に開示されているSiO2系表面被覆材料を溶射し
たロールは、耐ビルドアツプ性には優れているが
950℃以上で長時間使用するとSiO2等の結晶形態
は、非晶質から結晶化が進み、再結晶による収縮
でSiO2系溶射皮膜が剥離する等の問題がある。
〔発明が解決しようとする問題点〕
本発明者等は、これら酸化性又は還元性雰囲気
中で使用される炉内ロールに適用すべき耐剥離性
に優れ、かつビルドアツプ防止効果の大きい被覆
材料、被覆方法を種々研究の結果、炉内ロール基
体との密着性に優れ、剥脱することがなく、かつ
耐ビルドアツプ性にも優れた被覆ロールを見出
し、本発明を完成した。
すなわち、本発明は酸化性又は還元性雰囲気中
に設置されて使用するに際して、優れた耐剥離性
とビルドアツプ防止効果に優れた被覆層をロール
表面に形成した炉内ロールを提供することを目的
になされたものである。
〔問題点を解決するための手段〕
本発明の要旨とするところは下記のとおりであ
る。
(1) ZrSiO4を30〜80％含み、残部がCo、Cr、
Ni、Mo、Al、Ta、Ｙ等の耐熱金属または合
金からなるサーメツト溶射被覆層を有し、該被
覆層の表面に酸化クロムを被覆してなることを
特徴とする熱処理炉用炉内ロール。
(2) ロール基体表面に、ZrSiO4を30〜80％含み、
残部がCo、Cr、Ni、Mo、Al、Ta、Ｙ等の耐
熱金属または合金からなるサーメツト溶射被覆
層を施し、該溶射被覆層に可溶性クロム化合物
の溶液を塗布した後、溶液中のCrO3がCr2O3に
化学変化するに十分な温度に加熱し、次いで常
温まで冷却する一連の処理を１回若しくは２回
以上繰り返すことを特徴とする熱処理炉用炉内
ロールの製造方法。
〔作用〕
本発明を更に詳細に説明する。
高温雰囲気の熱処理炉において、鋼板を支持
し、搬送する炉内ロールの基体は耐熱鋼で作られ
る。この炉内ロールの表面にZrSiO4を30〜80重
量％含み、かつ残部がCo、Cr、Ni、Mo、Al、
Ta、Ｙ等の耐熱金属からなるサーメツト層の溶
射被覆層が、溶射法により0.05〜3.0mm厚さに施
され、その溶射被覆層に可溶性クロム化合物の溶
液を塗布した後、溶液中のCrO3がCr2O3に化学変
化するに充分な温度（250℃以上で、より好まし
くは500℃前後）まで加熱し、その後常温まで冷
却する一連の処理（可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
し、溶射被覆層の表面の少なくとも一部は酸化ク
ロムによつて被覆されており、かつ被覆層に存在
する一部気孔が酸化クロムによつて充填され、酸
化クロムと前記溶射被覆層が強固に結合したサー
メツト複合皮膜が形成される。
ZrSiO4は一般に鉄系金属との濡れ性、反応性
が悪いために熱処理炉の搬送ロールとして使用す
る場合、材質としては、耐ビルドアツプ性に対し
て好適な材料である。ところが溶射材料は溶射炎
により一部ZrO2と非晶質SiO2に分解されて被覆
されるので、高温下で使用する場合、ZrSiO4へ
の再結晶化が進み、再結晶による収縮で溶射被覆
層の剥離が起こる。
そこで本発明では、ZrSiO4に結合材としてCo、
Cr、Ni、Mo、Al、Ta、Ｙ等の耐熱金属又は合
金を適量配合した溶射被覆層に可溶性クロム溶液
を塗布し焼成することによつて、酸化クロムと前
記溶射被覆層が強固に結合されたサーメツト皮膜
を提供するものである。
ここで、可溶性クロム溶液を溶射被覆層に塗布
し、焼成することによつて、溶射被覆層中の気孔
を酸化クロムによつて封孔し、またその表面を酸
化クロムで被覆する目的は、溶射被覆層との結合
を強固にすることと、耐ビルドアツプ性に優れた
酸化クロムの特性を効果的に利用するためであ
る。
ここで、ZrSiO4の添加量の下限に関しては30
重量％未満になると、ビルドアツプの発生量が増
大し、使用に耐えなくなることから決められる。
一方その量が多くなると耐剥離性が劣化するので
上限を80％とする。
また、耐ビルドアツプ性が優れていても、溶射
被覆層がロール基体の耐熱鋼から剥離しては無意
味であり、この剥離を防止するだけの密着力が必
要となる。この密着力を確保するためには、サー
メツト層内に含まれるCo、Cr、Ni、Mo、Al、
Ta、Ｙなどの耐熱金属又は合金の含有量が多い
程、密着力は向上し、耐剥離性は向上する。溶射
被覆層の剥離を防止するためには、結合材として
の耐熱金属又は合金量は20％以上が必要であるこ
とが確認された。
このように耐ビルドアツプ性と耐剥離性に優れ
た高温強度を確保し、炉内ロールとしての機能を
発揮するためには、ZrSiO4の適正配合量は30〜
80重量％である。
なお、本発明において、サーメツト複合被覆層
の厚さは、0.05mmより薄いと皮膜が摩耗した場
合、被覆層の効果がなくなつて、種々の高温特性
が発揮できず、一方被覆層が3.0mmより厚くなる
と層内に応力が蓄積して素材から剥離しやすくな
るので、被覆層の厚さは0.05mm〜3.0mmの範囲内
が適している。
〔実施例〕
表１に示す配合比のZrSiO4と耐熱合金からな
る溶射被覆材料を溶射によつて0.3mm厚さに施し、
その溶射被覆層にクロム酸溶液（比重1.50）を塗
布した後、550℃に加熱し、その後冷却してサー
メツト複合被覆層を形成した炉内ロールを無酸化
雰囲気、使用温度1000℃で長時間実機試験した。
表−１に示すように本発明ロール〜は非常
に優秀な耐ビルドアツプ性、耐用性を示し、他の
試験品に関してはビルドアツプが発生したり、あ
るいは溶射被覆層の剥離等を生じた。
更に〜と同様のサーメツト複合被覆層を
100×100mmの耐熱鋼表面に形成し、1000℃に一時
間加熱した後、水冷する操作を繰り返し、剥離す
るまでの回数を剥離指数として第１図に示す。
金属又は合金量の減少により、耐剥離性の低下
が確認され、結合材としての金属又は合金量は20
％以上、好ましくは30％以上必要なことがわか
る。
また、本発明によるハースロールを亜鉛メツキ
鋼板用連続焼鈍炉の均熱帯に組込み実操業使用を
開始したところ、本発明のハースロールは１年間
の使用においてもその被覆層には摩耗やビルドア
ツプ等、なんらの変化も認められず、従来の耐熱
鋼及び特開昭59−70712号公報等に開示されてい
るSiO2系表面被覆材料を溶射したロールに比べ
数倍の耐用時間を得る事ができた。
尚、本発明はメツキ系の連続焼鈍炉に限らず冷
延鋼板や電磁鋼板等の連続焼鈍炉で使用する場合
にも有効である。
[Industrial Application Field] The present invention relates to a roll disposed in a continuous heat treatment furnace for conveying a strip, and particularly to an in-furnace roll having excellent high-temperature strength, high-temperature wear resistance, and build-up resistance. Regarding the manufacturing method. [Prior Art] Conventionally, this type of spray-coated heat treatment furnace roll has the following features: (1) Co, Cr, Ni, Al, Co, Cr, Ni, Al,
Furnace rolls coated with heat-resistant metals or alloys such as (2) Rolls made of heat-resistant alloys whose surfaces are spray-coated with cermets made of ceramics such as CrC, Cr 2 O 3 , and metals or alloys such as Co, Ni, Cr, etc. Furnace roll, (3) Heat-resistant alloy roll surface containing Al 2 O 3 , ZrO 2 , SiO 2
Furnace rolls coated with thermally sprayed ceramics have been devised and used. However, none of these methods satisfy all of the desired characteristics in the furnace roll.
In other words, furnace rolls coated with heat-resistant metals or alloys such as Co, Cr, Ni, and Al, and furnace rolls coated with ceramics such as CrC, Cr2O3 , and cermets coated with metals such as Co, Cr, and Ni. Rolls have excellent abrasion resistance and peeling resistance, but are less effective in preventing build-up caused by adhesive deposits. Furthermore, in furnace rolls coated with ceramics such as Al 2 O 3 and ZrO 2 by thermal spraying, the coefficient of thermal expansion of the ceramics is smaller than that of the base metal, and if a rapid temperature rise or change in the temperature of the heat treatment furnace occurs. , resulting in decreased durability due to spalling failure and cracking. Furthermore, rolls coated with a SiO 2 surface coating material disclosed in Japanese Patent Application Laid-open No. 59-70712 have excellent build-up resistance.
When used for a long time at temperatures above 950°C, the crystal form of SiO 2 etc. progresses from amorphous to crystallized, causing problems such as the SiO 2 sprayed coating peeling off due to shrinkage due to recrystallization. [Problems to be Solved by the Invention] The present inventors have developed a coating material that has excellent peeling resistance and is highly effective in preventing build-up, which should be applied to furnace rolls used in these oxidizing or reducing atmospheres. As a result of various studies on coating methods, we have discovered a coated roll that has excellent adhesion to the furnace roll substrate, does not peel off, and has excellent build-up resistance, and has completed the present invention. That is, an object of the present invention is to provide a furnace roll having a coating layer formed on the roll surface with excellent peeling resistance and build-up prevention effect when used in an oxidizing or reducing atmosphere. It has been done. [Means for Solving the Problems] The gist of the present invention is as follows. (1) Contains 30 to 80% ZrSiO 4 with the remainder being Co, Cr,
1. A furnace roll for a heat treatment furnace, characterized in that it has a cermet spray coating layer made of a heat-resistant metal or alloy such as Ni, Mo, Al, Ta, Y, etc., and the surface of the coating layer is coated with chromium oxide. (2) Contains 30 to 80% ZrSiO 4 on the roll base surface,
After applying a cermet thermal spray coating layer, the remainder of which is made of a heat-resistant metal or alloy such as Co, Cr, Ni, Mo, Al, Ta, Y, etc., and applying a solution of a soluble chromium compound to the thermal spray coating layer, CrO 3 in the solution is applied. 1. A method for manufacturing a furnace roll for a heat treatment furnace, which comprises repeating a series of processes of heating to a temperature sufficient to chemically change Cr 2 O 3 to Cr 2 O 3 and then cooling to room temperature once or twice or more. [Function] The present invention will be explained in more detail. In a heat treatment furnace in a high-temperature atmosphere, the base of the furnace rolls that support and transport the steel plate is made of heat-resistant steel. The surface of this furnace roll contains 30 to 80% by weight of ZrSiO4 , and the balance is Co, Cr, Ni, Mo, Al,
A thermal spray coating layer of a cermet layer made of heat-resistant metals such as Ta and Y is applied to a thickness of 0.05 to 3.0 mm by thermal spraying, and after applying a solution of a soluble chromium compound to the thermal spray coating layer, CrO 3 in the solution is applied. A series of treatments (applying a solution of a soluble chromium compound - heating - cooling) by heating to a temperature sufficient to chemically change it into Cr 2 O 3 (250°C or higher, preferably around 500°C), and then cooling to room temperature. ) is applied once or twice or more, at least a part of the surface of the sprayed coating layer is covered with chromium oxide, and some of the pores present in the coating layer are filled with chromium oxide, and the chromium oxide A cermet composite film is formed in which the thermal spray coating layer and the thermal spray coating layer are firmly bonded. Since ZrSiO 4 generally has poor wettability and reactivity with iron-based metals, it is a suitable material for build-up resistance when used as a conveyor roll in a heat treatment furnace. However, the thermal spray material is partially decomposed into ZrO 2 and amorphous SiO 2 by the spray flame and coated, so when used at high temperatures, recrystallization to ZrSiO 4 progresses, and shrinkage due to recrystallization causes the thermal spray coating to deteriorate. Delamination of layers occurs. Therefore, in the present invention, Co is added to ZrSiO 4 as a binder.
By applying a soluble chromium solution to a thermally sprayed coating layer containing an appropriate amount of heat-resistant metals or alloys such as Cr, Ni, Mo, Al, Ta, Y, etc. and firing, the chromium oxide and the thermally sprayed coating layer are firmly bonded. The present invention provides a cermet film with a cermet coating. Here, by applying a soluble chromium solution to the sprayed coating layer and baking it, the pores in the sprayed coating layer are sealed with chromium oxide, and the purpose of coating the surface with chromium oxide is to This is to strengthen the bond with the coating layer and to effectively utilize the characteristics of chromium oxide, which has excellent build-up resistance. Here, the lower limit of the amount of ZrSiO 4 added is 30
This is determined because if it is less than % by weight, the amount of build-up will increase and it will become unusable.
On the other hand, if the amount increases, the peeling resistance deteriorates, so the upper limit is set at 80%. Further, even if the build-up resistance is excellent, it is meaningless if the thermal spray coating layer peels off from the heat-resistant steel of the roll base, and adhesion strength sufficient to prevent this peeling is required. In order to ensure this adhesion, Co, Cr, Ni, Mo, Al,
The higher the content of heat-resistant metals or alloys such as Ta and Y, the better the adhesion and the better the peeling resistance. It was confirmed that in order to prevent peeling of the thermal spray coating layer, the amount of heat-resistant metal or alloy as a binder must be 20% or more. In order to ensure high-temperature strength with excellent build-up resistance and peeling resistance, and to function as a furnace roll, the appropriate blending amount of ZrSiO 4 is 30~30~
It is 80% by weight. In the present invention, if the thickness of the cermet composite coating layer is less than 0.05 mm, the effect of the coating layer will be lost and various high-temperature properties will not be exhibited when the coating is worn away. The thickness of the coating layer is preferably within the range of 0.05 mm to 3.0 mm, as stress accumulates within the layer and it becomes easier to peel off from the material. [Example] A thermal spray coating material made of ZrSiO 4 and a heat-resistant alloy with the compounding ratio shown in Table 1 was applied to a thickness of 0.3 mm by thermal spraying.
After applying a chromic acid solution (specific gravity 1.50) to the sprayed coating layer, the roll was heated to 550℃ and then cooled to form a cermet composite coating layer. Tested. As shown in Table 1, the rolls of the present invention exhibited excellent build-up resistance and durability, while other test products exhibited build-up or peeling of the thermally sprayed coating layer. Furthermore, a cermet composite coating layer similar to ~
It was formed on a heat-resistant steel surface of 100 x 100 mm, heated to 1000°C for one hour, and then cooled with water. The number of times it took to peel off was shown in Figure 1 as the peeling index. It was confirmed that peeling resistance decreased due to a decrease in the amount of metal or alloy, and the amount of metal or alloy as a binder was 20%.
% or more, preferably 30% or more. In addition, when the hearth roll of the present invention was incorporated into the soaking zone of a continuous annealing furnace for galvanized steel sheets and actual operation was started, the hearth roll of the present invention showed wear and build-up in the coating layer even after one year of use. No changes were observed, and the service life was several times longer than that of conventional heat-resistant steel or rolls sprayed with SiO 2 surface coating material disclosed in Japanese Patent Application Laid-Open No. 59-70712. . The present invention is effective not only in continuous annealing furnaces for plating, but also in continuous annealing furnaces for cold-rolled steel sheets, electrical steel sheets, and the like.
【表】【table】
以上詳述したとおり、本発明ロールは、耐ビル
ドアツプ性と高温強度、高温耐摩耗性に著しく優
れており、ロール寿命延長に大きく貢献するもの
である。
As detailed above, the roll of the present invention has excellent build-up resistance, high-temperature strength, and high-temperature wear resistance, and greatly contributes to extending the life of the roll.
第１図は溶射被覆層中の耐熱合金含有量と剥離
指数との関係を示す図である。
FIG. 1 is a diagram showing the relationship between the heat-resistant alloy content in the thermally sprayed coating layer and the peeling index.
Claims (1)
Ni、Mo、Al、Ta、Ｙ等の耐熱金属または合金
からなるサーメツト溶射被覆層を有し、該被覆層
の表面に酸化クロムを被覆してなることを特徴と
する熱処理炉用炉内ロール。 ２ サーメツト溶射被覆層に存在する気孔が、酸
化クロムによつて封孔されていることを特徴とす
る特許請求の範囲第１項記載の熱処理炉用炉内ロ
ール。 ３ ロール基体表面に、ZrSiO4を30〜80％含み、
残部がCo、Cr、Ni、Mo、Al、Ta、Ｙ等の耐熱
金属または合金からなるサーメツト溶射被覆層を
施し、該溶射被覆層に可溶性クロム化合物の溶液
を塗布した後、溶液中のCrO3がCr2O3に化学変化
するに十分な温度に加熱し、次いで常温まで冷却
する一連の処理を１回若しくは２回以上繰り返す
ことを特徴とする熱処理炉用炉内ロールの製造方
法。[Claims] 1 Contains 30 to 80% ZrSiO 4 , with the balance being Co, Cr,
1. A furnace roll for a heat treatment furnace, characterized in that it has a cermet spray coating layer made of a heat-resistant metal or alloy such as Ni, Mo, Al, Ta, Y, etc., and the surface of the coating layer is coated with chromium oxide. 2. The furnace roll for a heat treatment furnace according to claim 1, wherein pores existing in the cermet spray coating layer are sealed with chromium oxide. 3 Contains 30 to 80% ZrSiO 4 on the roll base surface,
After applying a cermet thermal spray coating layer, the remainder of which is made of a heat-resistant metal or alloy such as Co, Cr, Ni, Mo, Al, Ta, Y, etc., and applying a solution of a soluble chromium compound to the thermal spray coating layer, CrO 3 in the solution is applied. 1. A method for manufacturing a furnace roll for a heat treatment furnace, which comprises repeating a series of processes of heating to a temperature sufficient to chemically change Cr 2 O 3 to Cr 2 O 3 and then cooling to room temperature once or twice or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19154586A JPS6347379A (en) | 1986-08-15 | 1986-08-15 | In-furnace roll for heat treating furnace and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19154586A JPS6347379A (en) | 1986-08-15 | 1986-08-15 | In-furnace roll for heat treating furnace and its production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6347379A JPS6347379A (en) | 1988-02-29 |
| JPH05473B2 true JPH05473B2 (en) | 1993-01-06 |
Family
ID=16276456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19154586A Granted JPS6347379A (en) | 1986-08-15 | 1986-08-15 | In-furnace roll for heat treating furnace and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6347379A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0819535B2 (en) * | 1989-08-17 | 1996-02-28 | トーカロ株式会社 | Roll for high temperature heat treatment furnace and method for manufacturing the same |
| WO1993011277A1 (en) * | 1991-11-29 | 1993-06-10 | Nippon Steel Hardfacing Co., Ltd. | Process for producing immersion member of molten metal bath |
| JPH03226517A (en) * | 1990-01-30 | 1991-10-07 | Nippon Steel Corp | In-furnace roll for heat treatment |
| JP3356889B2 (en) | 1994-08-26 | 2002-12-16 | プラクスエア エス ティ テクノロジー インコーポレイテッド | Hearth roll with excellent durability |
| 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. |
| JP2009102683A (en) * | 2007-10-22 | 2009-05-14 | Fujimi Inc | Thermal spraying powder |
| JP5356929B2 (en) * | 2009-06-24 | 2013-12-04 | Ｊｆｅスチール株式会社 | Hearth roll and manufacturing method thereof |
-
1986
- 1986-08-15 JP JP19154586A patent/JPS6347379A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6347379A (en) | 1988-02-29 |
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