JPH06158263A - Roll for heat treatment furnace - Google Patents
Roll for heat treatment furnaceInfo
- Publication number
- JPH06158263A JPH06158263A JP31697292A JP31697292A JPH06158263A JP H06158263 A JPH06158263 A JP H06158263A JP 31697292 A JP31697292 A JP 31697292A JP 31697292 A JP31697292 A JP 31697292A JP H06158263 A JPH06158263 A JP H06158263A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- resistance
- heat
- heat treatment
- 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.)
- Withdrawn
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 22
- 238000000576 coating method Methods 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 13
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 9
- 239000000956 alloy Substances 0.000 claims abstract description 9
- 239000007769 metal material Substances 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims description 23
- 239000007921 spray Substances 0.000 claims description 13
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 9
- 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 claims description 9
- 230000035939 shock Effects 0.000 abstract description 11
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 9
- 238000007751 thermal spraying Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 description 16
- 238000012360 testing method Methods 0.000 description 15
- 229910004298 SiO 2 Inorganic materials 0.000 description 10
- 239000010410 layer Substances 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 229910001651 emery Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007750 plasma spraying Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 239000011195 cermet Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910018138 Al-Y Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 241001272720 Medialuna californiensis Species 0.000 description 1
- 101100032932 Mus musculus Raly gene Proteins 0.000 description 1
- 229910003310 Ni-Al Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、セラミックスや金属
等のロ−ル表面にセラミックが溶射された熱処理炉用ロ
−ルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll for a heat treatment furnace in which the surface of a roll of ceramics or metal is sprayed with ceramics.
【０００２】[0002]
【従来の技術】熱処理炉用ロ−ルは、その性質から非常
に厳しい環境下で使用されるが、これに要求される各種
の特性は、最近一段と過酷さを増してきている。耐熱
性、耐熱衝撃性、耐摩耗性などの各種特性は、過酷化す
る操業環境にとって益々重要となっている。また、これ
らの特性向上によるロ−ルの長寿命化は、通常これらの
部材が高価なところから、コストの低下をもたらす面か
らも重要である。2. Description of the Related Art Rolls for heat treatment furnaces are used in a very severe environment due to their properties, and the various characteristics required for them have recently become more severe. Various properties such as heat resistance, thermal shock resistance, and wear resistance are becoming more and more important for harsh operating environments. In addition, extending the life of the roll by improving these characteristics is also important from the standpoint of reducing the cost because these members are usually expensive.
【０００３】また、熱処理炉用ロ−ルは、還元性または
酸化性雰囲気中で６００〜１２００℃という高温で使用
されるので、使用中にロ−ル表面は通板材によって著し
い摩耗を受けるとともに、酸化鉄粉やその他の酸化物が
ロ−ル表面に堆積して、いわゆるビルドアップを発生す
る。Further, since the roll for heat treatment furnace is used at a high temperature of 600 to 1200 ° C. in a reducing or oxidizing atmosphere, the roll surface is significantly worn by the strip material during use. Iron oxide powder and other oxides are deposited on the surface of the roll, so-called build-up occurs.
【０００４】ビルドアップが発生すると、ロ−ル表面は
凸状となり通板材への疵入りの原因となり、製品の品質
低下を招く。そのために、ビルドアップが発生すると操
業を停止し、ロ−ル表面の手入れや損耗が激しい場合は
ロ−ルの交換を行っているのが現状である。こうしたメ
ンテナンス作業は、現在の炉内ロ−ルの耐久性が乏しい
ために頻繁に行われており、その都度操業停止を余儀無
くされ計画生産の支障となっている。またこれは、最終
的には製品コストを上昇させる要因ともなっていた。When build-up occurs, the roll surface becomes convex, causing flaws in the sheet-passing material, resulting in deterioration of product quality. Therefore, when build-up occurs, the operation is stopped, and when the roll surface is heavily cared for or worn, the roll is replaced. Such maintenance work is frequently performed due to the poor durability of the current furnace roll, and the operation must be stopped each time, which hinders the planned production. In addition, this was a factor that eventually increased the product cost.
【０００５】こうしたことから、耐久性の高い熱処理炉
用ロ−ルの要求が強く、最近ではロ−ルの表面改質の対
策の一つとして、各種溶射ロ−ルが提案され使用され始
めている。この溶射ロ−ルは、酸化物セラミックス系の
溶射ロ−ル、酸化物または硼化物などと耐熱金属とのサ
−メット系の溶射ロ−ルなどがあるが、それぞれに長所
もあるが短所もあって、現在までのところ満足のいく製
品は得られていない。即ち、サ−メット系の溶射ロ−ル
は、耐摩耗性および皮膜の耐剥離性には優れているが、
高温耐腐食性や耐ビルドアップ性に不十分であり、高温
域では使用出来ない。一方、セラミックス系溶射ロ−ル
は耐ビルドアップ性は良好であるが、耐熱衝撃性や耐摩
耗性が劣り、特に皮膜の耐剥離性が劣るためロ−ルの寿
命が短く実用上の利点はそれ程ない。For these reasons, there is a strong demand for a roll for a heat treatment furnace having high durability, and recently, various spraying rolls have been proposed and started to be used as one of the measures for surface modification of the roll. . This thermal spraying roll includes an oxide ceramics thermal spraying roll and a cermet thermal spraying roll of an oxide or boride and a refractory metal, but each has its own advantages and disadvantages. So far, no satisfactory product has been obtained so far. That is, the cermet type thermal spray roll is excellent in wear resistance and peeling resistance of the coating,
Insufficient in high temperature corrosion resistance and build-up resistance, it cannot be used in high temperature range. On the other hand, ceramic-based sprayed rolls have good build-up resistance, but have poor thermal shock resistance and wear resistance, and in particular the peeling resistance of the coating is poor, resulting in a short roll life and practical advantages. Not so much.
【０００６】[0006]
【発明が解決しようとしている課題】この発明は、耐熱
性、耐熱衝撃性、高温耐腐食性、耐摩耗性、耐ビルドア
ップ性および皮膜の耐剥離性といった優れた特性を有す
る溶射皮膜を形成した熱処理炉用ロ−ルを得ようとする
ものである。DISCLOSURE OF THE INVENTION The present invention forms a thermal spray coating having excellent properties such as heat resistance, thermal shock resistance, high temperature corrosion resistance, wear resistance, build-up resistance and film peeling resistance. It is intended to obtain a roll for a heat treatment furnace.
【０００７】[0007]
【課題を解決するための手段】この発明は、耐熱性金属
のロ−ル表面に、この金属材料と同等もしくはそれ以上
の耐熱性を有する耐熱性金属または耐熱性合金を溶射被
覆し、その上に２ＣａＯ・ＳｉＯ2 の溶射皮膜を形成し
たことを特徴とする熱処理炉用ロ−ルおよび請求項１記
載の熱処理炉用ロ−ルの溶射皮膜を、さらにクロム酸を
主成分とする溶液で処理しこれを３００℃以上で熱処理
してなることを特徴とする熱処理炉用ロ−ル（請求項
２）である。以下に、これらの発明をさらに説明する。According to the present invention, the roll surface of a heat-resistant metal is spray-coated with a heat-resistant metal or a heat-resistant alloy having a heat resistance equal to or higher than that of the metal material. A heat treatment furnace roll characterized by having a 2CaO.SiO 2 sprayed coating formed thereon and the heat treatment furnace roll according to claim 1 are further treated with a solution containing chromic acid as a main component. A roll for a heat treatment furnace (claim 2), characterized by being heat-treated at 300 ° C. or higher. Hereinafter, these inventions will be further described.
【０００８】請求項１の発明の熱処理炉用ロ−ルは、基
材ロ−ルの耐熱性金属材料の表面に、この耐熱性金属材
料と同等もしくはそれ以上の耐熱性金属または耐熱性合
金を溶射被覆し、その上に２ＣａＯ・ＳｉＯ2 の溶射皮
膜を形成するものである。In the roll for heat treatment furnace of the invention of claim 1, a heat-resistant metal or heat-resistant alloy equal to or higher than the heat-resistant metal material is provided on the surface of the heat-resistant metal material of the base material roll. The thermal spray coating is performed, and the thermal spray coating of 2CaO.SiO 2 is formed on the surface.
【０００９】この発明の熱処理用ロ−ルの外表面の溶射
皮膜を構成する２ＣａＯ・ＳｉＯ2は、熱処理炉用ロ−
ルとして要求される耐熱性、耐熱衝撃性、耐摩耗性、高
温耐腐食性、皮膜の耐剥離性、耐ビルドアップ性といっ
た様々な利点を有している。即ち、２ＣａＯ・ＳｉＯ2
は、無機質材料としては熱膨脹率が非常に大きな値を示
し、金属と同程度の値を示す。また、この材料は無機質
材料の中では比較的低融点で、しかもその溶融物は低粘
性で、従って溶射時における溶融性が高いことが特徴で
ある。The 2CaO.SiO 2 constituting the thermal spray coating on the outer surface of the heat treatment roll of the present invention is a heat treatment furnace roll.
It has various advantages such as heat resistance, heat shock resistance, wear resistance, high temperature corrosion resistance, film peeling resistance, and build-up resistance that are required as a tool. That is, 2CaO ・ SiO 2
Shows a very large coefficient of thermal expansion as an inorganic material, which is similar to that of metal. Further, this material is characterized in that it has a relatively low melting point among inorganic materials, and its melt has a low viscosity, and therefore has a high meltability during thermal spraying.
【００１０】こうした２ＣａＯ・ＳｉＯ2 の特徴は、上
述した熱膨脹率の特徴とあいまって、溶射皮膜となった
場合に独特の溶射皮膜組織を形成する。即ち、溶射され
たこれらの材料は基材上で十分に溶融した皮膜を形成
し、その後の冷却過程で著しく収縮する。そして、この
冷却収縮にともなう寸法変化によって、溶射皮膜組織中
に微細な多数のクラックを発生する。このクラックは、
数μｍ程度と極めて微細であるが、基材に対して選択的
に垂直方向に発生する点が特徴である。この微細垂直の
クラックは、熱応力緩和に極めて有効に作用し、溶射皮
膜に対して優れた耐熱衝撃性を与えることになる。The characteristics of 2CaO.SiO 2 combined with the characteristics of the coefficient of thermal expansion described above form a unique thermal spray coating structure when a thermal spray coating is formed. That is, these sprayed materials form a sufficiently melted coating on the substrate and shrink significantly during the subsequent cooling process. Then, due to the dimensional change accompanying the cooling shrinkage, a large number of fine cracks are generated in the structure of the thermal spray coating. This crack is
It is extremely fine, about several μm, but is characterized in that it is selectively generated in the direction perpendicular to the substrate. The fine vertical cracks act extremely effectively for thermal stress relaxation, and give the thermal spray coating excellent thermal shock resistance.
【００１１】さらに、２ＣａＯ・ＳｉＯ2 の皮膜は、含
有する化学成分および溶射したときの溶射皮膜の組織の
特異性から、優れた耐ビルドアップ性、高温耐腐食性、
耐剥離性を有する点も特徴である。具体的には、種々の
反応成分、腐食成分に対して皮膜の濡れ性が小さく即ち
反応性が低いため、優れた耐ビルドアップ性、高温耐腐
食性を発現する。こうした反面、バナジウムやイオウ化
合物に対してはむしろ積極的に反応して安定な化合物を
皮膜表面に生成し、新たな腐食成分に対して保護膜的な
作用を果たす特徴がある。Further, the 2CaO.SiO 2 coating has excellent build-up resistance, high-temperature corrosion resistance, due to the chemical composition contained and the specificity of the structure of the sprayed coating when sprayed.
Another feature is that it has peeling resistance. Specifically, the wettability of the film is low with respect to various reactive components and corrosive components, that is, the reactivity is low, so that excellent build-up resistance and high temperature corrosion resistance are exhibited. On the other hand, it has the characteristic that it reacts more positively with vanadium and sulfur compounds to form stable compounds on the film surface, and acts as a protective film against new corrosive components.
【００１２】しかしながら、２ＣａＯ・ＳｉＯ2 の皮膜
の特徴をさらに最大限に発揮させるには、基材とこれら
の間に金属溶射の中間層を形成することが必要である。
この中間層は、基材の金属と同等もしくはそれ以上の耐
熱性を有する金属または合金の溶射によって形成され
る。ここで用いられる金属は、例えばＣｏ、Ｎｉ、Ｃ
ｒ、Ａｌ、Ｙ、Ｔａ、Ｈｆであり、また合金の事例は、
Ｎｉ−Ｃｒ、Ｎｉ−Ａｌ、ＮｉＣｒＡｌＹ、ＣｏＮｉＣ
ｒＡｌＹである。なお、ここで用いられる基材ロ−ルの
材質は、従来と同様でよく、例えばJIS SCH22 などであ
る。However, in order to further maximize the characteristics of the 2CaO.SiO 2 coating, it is necessary to form an intermediate layer of metal spraying between the base material and these.
This intermediate layer is formed by thermal spraying of a metal or alloy having heat resistance equal to or higher than that of the base metal. The metals used here are, for example, Co, Ni, C
r, Al, Y, Ta, Hf, and examples of alloys are
Ni-Cr, Ni-Al, NiCrAlY, CoNiC
It is rAlY. The material of the base roll used here may be the same as the conventional one, for example, JIS SCH22.
【００１３】さらに、請求項２の発明は、請求項１の溶
射皮膜層をクロム酸を主成分とする溶液で処理し、さら
にこれを３００℃以上で熱処理するものであり、これに
よって皮膜の耐ビルドアップ性および耐摩耗性がさらに
優れた溶射被覆を有する熱処理用ロ−ルを得ることが出
来る。その理由は、Ｃｒ2 Ｏ3 を主成分とする酸化物が
形成されるためである。なお、熱処理温度は、反応の関
係から３００℃以上、好ましくは４００℃以上である。
また、けい酸塩系封孔剤の添加、セラミックコ−ティン
グ剤などの使用もできるが、Ｃｒ2 Ｏ3 を生成するクロ
ム酸系がもっとも良いことを確認した。Further, in the invention of claim 2, the sprayed coating layer of claim 1 is treated with a solution containing chromic acid as a main component, and further this is heat-treated at 300 ° C. or higher, whereby the coating resistance is improved. It is possible to obtain a heat treatment roll having a thermal sprayed coating which is further excellent in build-up property and wear resistance. The reason is that an oxide containing Cr 2 O 3 as a main component is formed. The heat treatment temperature is 300 ° C. or higher, preferably 400 ° C. or higher in terms of reaction.
Although a silicate-based sealing agent can be added and a ceramic coating agent can be used, it has been confirmed that a chromic acid-based one that produces Cr 2 O 3 is the best.
【００１４】ここでのクロム酸の処理は、例えば濃度３
０％のクロム酸溶液を溶射被覆部材の表面にハケ塗り或
いはスプレ−して数十度で１０分程度加熱乾燥する。そ
の後これを３００℃以上で加熱する。加熱温度の上限は
通常６００℃である。処理時間はおよそ６０分である。
ここでの加熱温度が３００℃未満であると前記した酸化
物が得られず、その効果を期待することが出来ない。The treatment of chromic acid here is carried out, for example, with a concentration of 3
The surface of the thermal spray coating member is brushed or sprayed with a 0% chromic acid solution and heated and dried at several tens of degrees for about 10 minutes. Then, this is heated at 300 ° C. or higher. The upper limit of the heating temperature is usually 600 ° C. The processing time is approximately 60 minutes.
If the heating temperature here is less than 300 ° C., the above oxide cannot be obtained, and the effect cannot be expected.
【００１５】ロ−ルの基材表面に溶射皮膜を形成するに
は、プラズマ溶射、爆発溶射、高速フレ−ム溶射、ガス
溶射などの方法を用いることが出来るが、十分に溶融し
た均質な溶射皮膜を形成するにはプラズマ溶射が好まし
い。In order to form a sprayed coating on the surface of the base material of the roll, methods such as plasma spraying, explosive spraying, high speed flame spraying and gas spraying can be used. Plasma spraying is preferred for forming the coating.
【００１６】[0016]
【作用】２ＣａＯ・ＳｉＯ2 で耐熱衝撃性、耐熱衝撃
性、耐摩耗性、高温耐腐食性、皮膜の耐剥離性、耐ビル
ドアップ性に優れた溶射皮膜を形成するとともに、この
溶射皮膜の特性をさらに発揮させるために、ロ−ル基材
と溶射皮膜の中間に、基材と同等またはそれ以上の耐熱
性を有する耐熱性金属または耐熱性合金を溶射被覆する
ものである。[Function] 2CaO / SiO 2 forms a thermal spray coating having excellent thermal shock resistance, thermal shock resistance, wear resistance, high temperature corrosion resistance, coating peeling resistance and build-up resistance, and the characteristics of this thermal spray coating. In order to further exhibit the above, the heat-resistant metal or heat-resistant alloy having heat resistance equal to or higher than that of the base material is spray-coated between the roll base material and the thermal spray coating.
【００１７】[0017]
（実施例１〜６） (Examples 1 to 6)
【００１８】ＳＵＳ３０４の基材表面に、表１に示すよ
うな中間層を溶射で形成した。この上に２ＣａＯ・Ｓｉ
Ｏ2 で厚さ１５０μｍの溶射皮膜を形成した。これにつ
いて以下の試験をして、その耐ビルドアップ性（ＭＮ
値）、耐摩耗性（ＤＳ／mg）、耐剥離性（回）を求め
た。An intermediate layer as shown in Table 1 was formed on the surface of the substrate of SUS304 by thermal spraying. 2CaO / Si on this
A thermal spray coating having a thickness of 150 μm was formed with O 2 . The following tests were conducted on this, and its build-up resistance (MN
Value), abrasion resistance (DS / mg), and peel resistance (times).
【００１９】結果を表１に示した。同表において、クロ
ム酸含浸処理は、３０％クロム酸溶液を塗布し４５０℃
で３０分間焼成した場合を示し、○印は該処理を実施し
たものを示す。また、表中の性能の中の△は特性不良を
示す。なお、表の溶射皮膜組成は溶射材料からみた成分
である。The results are shown in Table 1. In the table, the chromic acid impregnation treatment is performed by applying a 30% chromic acid solution at 450 ° C.
Shows the case where it was baked for 30 minutes, and the mark ◯ shows that the treatment was carried out. Further, Δ in the performances in the table indicates a characteristic defect. The composition of the thermal spray coating in the table is the component seen from the thermal spray material.
【００２０】[0020]
【表１】 [Table 1]
【００２１】耐ビルドアップ性は図１に示す方法で求め
た。同図に示すように、２枚の溶射試験片１の間（Ｂ
面、Ｃ面の間）と、上側（Ａ面）の溶射試験片１の上面
にビルドアップ原料２を散布した。図１に示すように半
月形ロ−ルで荷重をかけながら往復運動を行い、Ａ、
Ｂ、Ｃの各面のビルドアップ状況を評価した。試験は表
２に示す条件に調整して行った。評価は、下記の表３に
示す基準で得られる得点の合計点数（９点満点）で行っ
た。The buildup resistance was determined by the method shown in FIG. As shown in the figure, between the two thermal spray test pieces 1 (B
Surface, C surface) and the upper surface (A surface) of the thermal spray test piece 1 were sprayed with the buildup raw material 2. As shown in Fig. 1, a reciprocating motion is performed while applying a load with a half-moon shaped roll.
The buildup status of each side of B and C was evaluated. The test was conducted under the conditions shown in Table 2. The evaluation was performed based on the total score (9 points maximum) obtained according to the criteria shown in Table 3 below.
【００２２】[0022]
【表２】 [Table 2]
【００２３】[0023]
【表３】 [Table 3]
【００２４】耐摩耗性は図２に示す装置で行うスガ式摩
耗試験で求めた。この試験は図２に示すように、溶射試
験片３を往復運動させ、溶射皮膜４と外周にエメリ−ペ
−パ−５を巻いた円板との間で摩擦摩耗を生ぜしめるも
のである。円板は、試験片が１往復毎に０．９度ずつ回
転し、常に新しい面が当たるようになっている。エメリ
−ペ−パ−の種類、ここでの荷重は表４に示す通りとし
た。The wear resistance was determined by a Suga-type wear test conducted by the apparatus shown in FIG. In this test, as shown in FIG. 2, the thermal spray test piece 3 is reciprocated to cause frictional wear between the thermal spray coating 4 and the disk having the emery paper 5 wound around the outer periphery thereof. The disk rotates such that the test piece rotates 0.9 degrees each time the test piece reciprocates, and a new surface is constantly contacted. Table 4 shows the types of emery papers and the loads here.
【００２５】[0025]
【表４】 [Table 4]
【００２６】さらに耐摩耗性は、１mg摩耗するのに要し
た試験片の往復回数（ＤＳ／mg）で示した。また、耐剥
離性は、表５に示す熱衝撃を加え皮膜剥離が発生するま
での回数を求めた。Further, the abrasion resistance was indicated by the number of reciprocations of the test piece (DS / mg) required for abrasion of 1 mg. Further, the peeling resistance was determined by the number of times until the film peeling occurred by applying the thermal shock shown in Table 5.
【００２７】[0027]
【表５】 [Table 5]
【００２８】表１に示すように、本発明のものはいずれ
も耐ビルドアップ性、耐摩耗性、耐剥離性がいずれも優
れている。なお、表１には、この発明で特定した範囲か
ら外れた溶射皮膜の組成についての比較例１〜４を示し
た。同表に示すように、比較例のものはいずれも耐ビル
ドアップ性、耐摩耗性、耐剥離性のいずれかが劣り、良
好な溶射被覆皮膜は得られない。 ［実施例２］As shown in Table 1, all of the present inventions are excellent in build-up resistance, abrasion resistance and peeling resistance. In addition, Table 1 shows Comparative Examples 1 to 4 regarding the composition of the thermal spray coating outside the range specified in the present invention. As shown in the table, all of the comparative examples are inferior in build-up resistance, abrasion resistance and peeling resistance, and a good thermal spray coating cannot be obtained. [Example 2]
【００２９】２５Ｃｒ−２０Ｎｉ耐熱合金鋼ロ−ル（φ
１５０×Ｌ２０００）の表面に、中間層として耐熱合金
の８０Ｎｉ−２０Ｃｒの粉末をプラズマ溶射して厚さ１
０μｍの皮膜を形成した。この中間層の表面に２ＣａＯ
・ＳｉＯ2 の溶射材料をプラズマ溶射し、約３００μｍ
の皮膜を形成し本発明の熱処理炉用ロ−ルを得た。比較
例として、ロ−ル基材、中間層を同様としてこれにＺｒ
Ｏ2 −８mol ％Ｙ2 Ｏ3 の溶射材料をプラズマ溶射して
約３００μｍの皮膜を形成した。これらのロ−ルをけい
素鋼熱処理炉内に同一に並べて装着し、温度８００〜８
５０℃、雰囲気５０％Ｈ2 −５０％Ｎ2 の下で６か月の
耐用試験を行った。25Cr-20Ni heat-resistant alloy steel roll (φ
The surface of 150 × L2000) is plasma-sprayed with a powder of heat-resistant alloy 80Ni-20Cr as an intermediate layer to a thickness of 1
A 0 μm film was formed. 2CaO on the surface of this intermediate layer
・ Approximately 300 μm by plasma spraying of SiO 2 sprayed material
To form a film to obtain a roll for a heat treatment furnace of the present invention. As a comparative example, a roll base material and an intermediate layer were the same, and Zr
A thermal spray material of O 2 -8 mol% Y 2 O 3 was plasma sprayed to form a coating of about 300 μm. These rolls were installed in a silicon steel heat treatment furnace side by side in the same manner at a temperature of 800 to 8
A 6-month durability test was performed at 50 ° C. in an atmosphere of 50% H 2 -50% N 2 .
【００３０】その結果、本発明品のロ−ル表面にはスケ
−ルのビルトアップの発生は認められず、また局部的な
剥離やクラックもなく、使用期間中良好に使用すること
が出来た。これに対し、比較例品はロ−ル表面にスケ−
ルのビルドアップの発生が著しく、皮膜の剥離も各所に
認められて６か月の使用には耐えられないことが判明し
た。 ［実施例３］As a result, no scale build-up was observed on the roll surface of the product of the present invention, and there was no local peeling or cracking, and the product could be used satisfactorily during the period of use. . In contrast, the product of the comparative example is scaled on the roll surface.
It was found that the build-up of the rubber was notable and the peeling of the film was observed in various places, and it could not withstand 6 months of use. [Example 3]
【００３１】実施例２と同様にして、基材に２５Ｃｒ−
１２Ｎｉ耐熱合金鋼ロ−ル（φ１５０×Ｌ２０００）を
用い、中間層としてＮｉ−Ｃｒ−Ａｌ−Ｙ合金粉末をプ
ラズマ溶射し厚さ１００μｍの皮膜を形成した。この表
面に２ＣａＯ・ＳｉＯ2 の溶射材料をプラズマ溶射し、
約３００μｍの皮膜を形成し本発明の熱処理炉用ロ−ル
を得た。さらに、この溶射皮膜にクロム酸溶液を前記の
方法で含浸させ、これを４２０℃で熱処理を行いこの発
明の熱処理炉用ロ−ルを得た。In the same manner as in Example 2, 25Cr-was added to the base material.
A 12Ni heat-resistant alloy steel roll (φ150 × L2000) was used to plasma-spray Ni—Cr—Al—Y alloy powder as an intermediate layer to form a film having a thickness of 100 μm. Plasma-spray a 2CaO / SiO 2 thermal spray material on this surface,
A film having a thickness of about 300 μm was formed to obtain a roll for a heat treatment furnace of the present invention. Further, this thermal spray coating was impregnated with a chromic acid solution by the above-mentioned method and heat-treated at 420 ° C. to obtain a roll for a heat treatment furnace of the present invention.
【００３２】この熱処理炉用ロ−ルを実施例２と同一の
条件で耐用試験した。その結果、ロ−ル表面にはビルド
アップの発生や腐食は何も認められず、また剥離やき裂
などもなく、使用期間中問題なく使用することが出来
た。This roll for heat treatment furnace was subjected to a durability test under the same conditions as in Example 2. As a result, no build-up or corrosion was observed on the surface of the roll, and neither peeling nor cracking occurred, and the roll could be used without any problem during the period of use.
【００３３】[0033]
【発明の効果】本発明によれば、耐ビルドアップ性、耐
熱性、さらに耐熱衝撃性などに優れた溶射皮膜を有する
皮膜を表面にもったロ−ルが形成されるので、これによ
れば耐熱性、耐熱衝撃性、耐剥離性、高温耐腐食性など
の点で優れたロ−ルとして高い信頼性を得て、ロ−ルの
寿命延長にも大きく貢献することができる。EFFECTS OF THE INVENTION According to the present invention, a roll having a coating having a sprayed coating excellent in build-up resistance, heat resistance, and thermal shock resistance is formed on the surface. The roll is highly reliable in terms of heat resistance, thermal shock resistance, peeling resistance, high temperature corrosion resistance and the like, and can greatly contribute to extending the life of the roll.
【図１】この発明の溶射皮膜を形成した部材の耐ビルド
アップ性をテストするための試験機の概略説明図。FIG. 1 is a schematic explanatory view of a tester for testing build-up resistance of a member having a sprayed coating according to the present invention.
【図２】この発明の溶射皮膜を形成した部材の耐摩耗性
をテストするための試験機の概略説明図。FIG. 2 is a schematic explanatory view of a tester for testing the wear resistance of a member having a sprayed coating according to the present invention.
１，３……溶射試験片、２……ビルドアップ原料、４…
…溶射皮膜、５……エメリ−ペ−パ−。1, 3 ... Thermal spray test piece, 2 ... Build-up raw material, 4 ...
… Sprayed coating, 5 …… Emery paper.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川添 勝利 千葉県君津市君津１番地 新日本製鐵株式 会社君津製鉄所構内日鉄ハード株式会社君 津事業所内 (72)発明者 指山 和之 福岡県北九州市戸畑区中原先ノ浜46 新日 本製鐵株式会社八幡製鉄所戸畑構内日鉄ハ ード株式会社戸畑事業所内 (72)発明者 津田 拓也 福岡県北九州市戸畑区中原先ノ浜46 新日 本製鐵株式会社八幡製鉄所戸畑構内日鉄ハ ード株式会社戸畑事業所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoru Kawazoe 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corp. Kimitsu Works premises Nippon Steel Hard Co., Ltd. Kimitsu Works (72) Inventor Kazuyuki Sashiyama Fukuoka 46 Nakahara Sanohama, Tobata-ku, Kitakyushu, Japan Prefecture Nippon Steel Co., Ltd. Yawata Works Tobata Campus, Nippon Steel Hard Co., Ltd. Tobata Works (72) Inventor Takuya Tsuda, Fukuoka Prefecture Nippon Steel Co., Ltd. Yawata Works Tobata Campus Nippon Steel Hard Co., Ltd. Tobata Works
Claims (2)
料と同等もしくはそれ以上の耐熱性を有する耐熱性金属
または耐熱性合金を溶射被覆し、その上に２ＣａＯ・Ｓ
ｉＯ2 の溶射皮膜を形成したことを特徴とする熱処理炉
用ロ−ル。1. A heat-resistant metal or a heat-resistant alloy having heat resistance equal to or higher than that of the metal material is spray-coated on the roll surface of the heat-resistant metal, and 2CaO.S is formed thereon.
A roll for a heat treatment furnace, characterized in that a sprayed coating of iO 2 is formed.
皮膜を、さらにクロム酸を主成分とする溶液で処理しこ
れを３００℃以上で熱処理してなることを特徴とする熱
処理炉用ロ−ル。2. A heat treatment furnace characterized in that the thermal spray coating of the roll for heat treatment furnace according to claim 1 is further treated with a solution containing chromic acid as a main component and heat treated at 300 ° C. or higher. For rolls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31697292A JPH06158263A (en) | 1992-11-26 | 1992-11-26 | Roll for heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31697292A JPH06158263A (en) | 1992-11-26 | 1992-11-26 | Roll for heat treatment furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06158263A true JPH06158263A (en) | 1994-06-07 |
Family
ID=18082992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31697292A Withdrawn JPH06158263A (en) | 1992-11-26 | 1992-11-26 | Roll for heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06158263A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001049420A (en) * | 1999-06-23 | 2001-02-20 | Sulzer Metco Us Inc | Thermal spraying powder of dicalcium silicate, its coating and its production |
-
1992
- 1992-11-26 JP JP31697292A patent/JPH06158263A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001049420A (en) * | 1999-06-23 | 2001-02-20 | Sulzer Metco Us Inc | Thermal spraying powder of dicalcium silicate, its coating and its production |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000201 |