JPH0657873B2 - Roll for heat treatment furnace - Google Patents
Roll for heat treatment furnaceInfo
- Publication number
- JPH0657873B2 JPH0657873B2 JP58109880A JP10988083A JPH0657873B2 JP H0657873 B2 JPH0657873 B2 JP H0657873B2 JP 58109880 A JP58109880 A JP 58109880A JP 10988083 A JP10988083 A JP 10988083A JP H0657873 B2 JPH0657873 B2 JP H0657873B2
- Authority
- JP
- Japan
- Prior art keywords
- roll
- heat treatment
- treatment furnace
- heat
- pickup
- 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
- 238000010438 heat treatment Methods 0.000 title claims description 17
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 239000011651 chromium Substances 0.000 description 35
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 239000000919 ceramic Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910001208 Crucible steel Inorganic materials 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 238000004901 spalling Methods 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000007751 thermal spraying Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は熱処理炉用ロール、特に各種金属板、例えば珪
素鋼板、ステンレス板、アルミニウム板、その他合金
板、銅およびその合金板等の熱処理において、雰囲気温
度３００〜1200℃の範囲で好適に使用しうる熱処理炉用
ロールに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to heat treatment furnace rolls, in particular heat treatment of various metal plates such as silicon steel plates, stainless steel plates, aluminum plates, other alloy plates, copper and alloy plates thereof. The present invention relates to a heat treatment furnace roll that can be suitably used in an atmosphere temperature range of 300 to 1200 ° C.
（従来技術） 従来、この種の熱処理炉用ロールとしては、 (1)高クロム、高ニッケル含有の耐熱合金製ロールを水
冷又は非水冷で直接被熱処理材を支持し、搬送に用いる
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
て、耐熱合金製ロール表面にAl2O3,ZrO2,SiO2,SiC等の
セラミックスを溶着被膜したもの、又は、セラミック
ス、セラミックファイバーをスリーブ状にして、被熱処
理材を支持し搬送に用いるセラミックロール、 (3)黒鉛又は黒鉛質繊維をスリーブ状にして被熱処理材
を支持し、搬送に用いるカーボンロール、等が考案され
使用されている。(Prior art) Conventionally, as a heat treatment furnace roll of this kind, (1) a metal roll used for transporting a heat-resistant alloy roll containing high chromium and high nickel directly supporting a heat-treated material with water cooling or non-water cooling, (2) wherein (1) the purpose of life extension of the heat-resistant alloy roll, that the Al 2 O 3, ZrO 2, ceramic SiO 2, SiC, etc. welded coating heat resistant alloy steel roll surface or ceramic, A ceramic roll in which sleeves of ceramic fibers are used to support the heat-treated material and is used for transportation, (3) A carbon roll in which sleeves of graphite or graphite fiber are used to support the heat-treated material and used for transportation, etc. have been devised. It is used.
しかし、これら何れの炉内ロールにおいても、希望する
特性をすべて満足するに至っていない。即ち、水冷金属
ロールにおいてはロール表面温度の低下により、ロール
ピックアップの発生には効果があるが、水冷による熱量
損失が非常に大きくなるという欠点がある。また非水冷
金属ロールにおいては、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℃以上の高温
下においては、ロールピックアップの多発により、被熱
処理材に押疵をつける等の品質低下をまねく結果とな
る。However, none of these in-furnace rolls has satisfied all the desired characteristics. That is, in the water-cooled metal roll, although the roll surface temperature is lowered, the roll-pickup is effective, but there is a drawback that the heat loss due to the water cooling becomes very large. With non-water-cooled metal rolls, heat loss due to water cooling can be eliminated, but when the furnace temperature (roll temperature) is 800 ° C or higher, the roll heat pick-up is frequent and the heat-treated material is scratched. This will result in a decline.
前記、耐熱合金製ロールのロールピックアップ防止を図
る手段として、耐熱合金製ロール表面に種々のセラミッ
クスの溶着被膜あるいはスリーブ状にして使用したロー
ルにおいては、セラミックスとしてSiCを用いた場合、
特に８００℃以上の高温焼鈍を必要とする珪素鋼、ステ
ンレス鋼のストリップにおいてロール表面上に鉄粉もし
くは鉄酸化物粉体が付着し、被熱処理材に疵をつけるロ
ールピックアップが発生しやすい。この傾向は、還元性
の雰囲気中において著しい発生となる。As a means for preventing roll pickup of the heat-resistant alloy roll, in a roll used in the form of a welding coating or sleeve of various ceramics on the heat-resistant alloy roll surface, when SiC is used as the ceramics,
In particular, in a strip of silicon steel or stainless steel that requires high-temperature annealing at 800 ° C. or higher, iron powder or iron oxide powder adheres to the surface of the roll, and a roll pickup that scratches the heat-treated material is likely to occur. This tendency becomes remarkable in a reducing atmosphere.
また、炭素質スリーブを用いた場合は、炉内のわずかな
酸素や水蒸気によって酸化損耗が進行し耐用性が低下す
るため、炉内を非酸化性雰囲気にしなければならず煩雑
な操作が要求されかつ装置コストが高くなると同時に炭
素質スリーブの使用範囲が非酸化性雰囲気に限定され
る。Further, when a carbonaceous sleeve is used, the oxidation wear progresses due to slight oxygen and water vapor in the furnace and the durability deteriorates, so the furnace must be in a non-oxidizing atmosphere and complicated operation is required. At the same time, the cost of the apparatus becomes high, and at the same time, the use range of the carbonaceous sleeve is limited to the non-oxidizing atmosphere.
さらに、Al2O3質、ZrO2質等の場合、熱膨張係数が大き
く熱処理炉の急速な昇温あるいは炉温変動を生じた場
合、スポーリング性破壊やクラックの発生による耐用性
の低下を起こす。また、特公57-8874号公報等で提案さ
れている溶融SiO2質スリーブは熱膨張係数が小さい為、
耐スポーリング抵抗は大きいが1000℃以上で長時間使用
すると、溶融SiO2質の結晶形態は、非晶質から結晶化が
進み、低膨張性を失い耐用しなくなる。Furthermore, in the case of Al 2 O 3 quality, ZrO 2 quality, etc., if the thermal expansion coefficient is large and the temperature of the heat treatment furnace rises rapidly or the furnace temperature fluctuates, the durability will decrease due to spalling fracture and cracking. Wake up. Further, since the molten SiO 2 material sleeve proposed in Japanese Patent Publication No. 57-8874 has a small coefficient of thermal expansion,
Although it has a large resistance to spalling, when it is used at 1000 ° C. or higher for a long time, the crystalline form of the molten SiO 2 substance is changed from amorphous to crystallization and loses its low expansion property and becomes unusable.
また、製造過程における焼成においても結晶形態から10
00℃以下の温度でしか焼成できないため、焼成後の溶融
SiO2質スリーブは、低強度であり研削による平滑度が出
しにくいこと、また、使用中の機械的衝撃で破壊しやす
い等の問題がある。In addition, even during firing in the manufacturing process, 10
Since it can only be fired at temperatures below 00 ° C, it melts after firing.
The SiO 2 sleeve has problems that it is low in strength, it is difficult to obtain smoothness by grinding, and it is easily broken by mechanical impact during use.
（発明の目的） このような実情に鑑み本発明は、耐ロールピックアップ
性に優れ、かつ耐スポーリング性に優れ、高強度を有す
るとともに高温雰囲気下において、高耐用性を発現する
熱処理炉用ロールを提供しようとするものである。(Object of the Invention) In view of such circumstances, the present invention provides a roll for a heat treatment furnace, which has excellent roll pick-up resistance, spalling resistance, high strength, and high durability in a high temperature atmosphere. Is to provide.
（発明の構成・作用） 本発明は、高温雰囲気の熱処理炉内で被熱処理材の金属
板を支持し、これを搬送する熱処理炉用ロールにおい
て、金属板を支持するロール表面が３０〜７０重量％
（以下重量％を単に％と記載する）のCr2O3と、残部Al2
O3の２種類の酸化物から成ることを特徴とする熱処理炉
用ロールを要旨とする。(Structure / Operation of the Invention) In the roll for a heat treatment furnace that supports and transports a metal plate of a material to be heat treated in a heat treatment furnace in a high temperature atmosphere, the roll surface supporting the metal plate has a weight of 30 to 70 weight. %
Cr 2 O 3 (hereinafter simply referred to as% by weight) and the balance Al 2
The gist is a roll for a heat treatment furnace, which is composed of two kinds of oxides of O 3 .
以下、本発明について詳述する。Hereinafter, the present invention will be described in detail.
本発明のロールの被覆層は、Cr2O3３０〜７０％、残部A
l2O3からなる。The coating layer of the roll of the present invention comprises Cr 2 O 3 30 to 70% and the balance A.
It consists of l 2 O 3 .
Cr2O3は一般に、鉄系金属との濡れ性、反応性が悪いた
めに、高温雰囲気下で焼鈍する熱処理炉の搬送ロールと
して使用する場合、材質的に耐ピックアップ性に優れた
材料である。Since Cr 2 O 3 generally has poor wettability and reactivity with ferrous metals, it is a material with excellent pick-up resistance when used as a transport roll for a heat treatment furnace that is annealed in a high temperature atmosphere. .
ところが、Cr2O3単味の場合、成形体の製造上の問題か
ら制約を受ける。焼結体スリーブの場合、Cr2O3は気化
蒸発し易い傾向があり、固体反応を促進するために、高
温下で焼成を行なっても気孔等を発生して緻密で高強度
の成形体は得難い。この問題点を解決し、緻密で高強度
の成形体を得るためには、焼結反応の促進が必要とな
り、そのためにはAl2O3の添加が効果を発揮する。However, in the case of Cr 2 O 3 alone, there are restrictions due to manufacturing problems of the molded body. In the case of a sintered body sleeve, Cr 2 O 3 tends to evaporate and evaporate easily, and in order to accelerate the solid reaction, even if firing is performed at a high temperature, pores and the like are generated and a compact and high-strength formed body is obtained. Hard to get. In order to solve this problem and obtain a compact and high-strength compact, it is necessary to accelerate the sintering reaction, and for that purpose, addition of Al 2 O 3 is effective.
Al2O3はCr2O3と結晶形態が似ていること、熱膨張係数が
近似していること、さらには、Al2O3自体の特性とし
て、高強度焼結体を形成し易いこと等、高強度の成形体
を得るのに極めて効果的な添加材料である。而して、搬
送用ロールに適した成形体を得るためには、３０％以上
のAl2O3量が不可欠である。しかし、耐ピックアップ性
の問題からCr2O3量が３０％以上必要となるので、おの
ずからAl2O3量は７０％が添加量の上限となってくる。Al 2 O 3 has a similar crystal morphology to Cr 2 O 3 and a similar thermal expansion coefficient. Furthermore, Al 2 O 3 itself has the property of easily forming a high-strength sintered body. It is an extremely effective additive material for obtaining a high-strength molded product. Therefore, in order to obtain a molded product suitable for a roll for transportation, an Al 2 O 3 amount of 30% or more is indispensable. However, since the amount of Cr 2 O 3 is required to be 30% or more due to the problem of pick-up resistance, naturally the upper limit of the amount of Al 2 O 3 added is 70%.
また、無機材料スリーブ表面、耐熱合金製ロール表面に
溶着被膜により包囲してなるロールを得るための溶射法
においても、Cr2O3単体では、高強度化、緻密化はし難
く、無機材料スリーブ、耐熱合金製ロール等母体との接
着強度が充分でなく母材と溶着被膜との間で剥離し易
く、使用に耐えない。Further, even in the thermal spraying method for obtaining a roll in which the surface of the inorganic material sleeve and the surface of the heat-resistant alloy roll are surrounded by a welding coating, the strength and densification of the inorganic material sleeve are difficult to achieve with Cr 2 O 3 alone. The adhesive strength to the base material such as a heat-resistant alloy roll is not sufficient, and the base material and the weld coating are easily peeled off and cannot be used.
この問題の解決を図るためにもAl2O3を３０％以上加え
ることにより、溶着被膜の緻密化、強度の向上が可能と
なり、使用に供することができる。Al2O3はCr2O3と溶融
温度が近く、また固溶体を形成し易いので、溶射の場合
の添加材料としても優れている。この場合においてもCr
2O3量は耐ピックアップ性と被膜の緻密性および強度の
面から決定され、Cr2O3量３０〜７０％が必要でありAl2
O3量においてもCr2O3の残部すなわち７０〜３０％が必
要となることは焼成体スリーブの場合と同様である。In order to solve this problem, addition of Al 2 O 3 in an amount of 30% or more makes it possible to densify the welded film and improve the strength, and it can be used. Since Al 2 O 3 has a melting temperature close to that of Cr 2 O 3 and easily forms a solid solution, it is also an excellent additive material in the case of thermal spraying. Even in this case Cr
2 O 3 amount is determined in terms of denseness and strength of the resistance to pick-up resistance and the film, it is necessary to Cr 2 O 3 content 30 to 70% Al 2
The remaining amount of Cr 2 O 3 , that is, 70 to 30%, is required for the amount of O 3 as in the case of the fired sleeve.
次に、ロールピックアップ性について、調査を行なった
結果について述べる。Next, the result of the investigation on the roll pickup property will be described.
ロールピックアップ性試験に用いた試料は、表−１に示
すような粉末の焼結により製造したCr2O3−Al2O3系焼成
体、Cr2O3−Al2O3系溶射物および比較品としての耐熱鋳
鋼であり、之等についてロールピックアップ性を調査し
た。The samples used for the roll pick-up test were the Cr 2 O 3 —Al 2 O 3 -based fired body, the Cr 2 O 3 —Al 2 O 3 -based sprayed material produced by sintering the powder as shown in Table 1 and A heat-resistant cast steel as a comparative product, and the roll pick-up property was investigated with respect to others.
試験片は50×50mmの厚み１０mmの平板状であり、表−１
に示すようにNO.１〜NO.１１までの試料を用意した平板
２枚の50×50mmの面間にピック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１kg／cm2の荷重
を加え、更にピックアップ原料と２枚の平板がこすり合
わされるような動きを与える。この様な試験装置を雰囲
気制御可能な電気炉中に設置するものである。 The test piece was a flat plate with a thickness of 50 mm and a thickness of 10 mm.
As shown in Fig. 1, the samples of No. 1 to NO. 11 were prepared by placing iron oxide powder, which is a raw material for pickup, on the 50 x 50 mm surface of two flat plates, and superimposing 1 kg / cm 2 thereof. A load is applied, and further movement is performed such that the pickup raw material and the two flat plates are rubbed together. Such a test apparatus is installed in an electric furnace whose atmosphere can be controlled.
ロールピックアップ性の試験は、雰囲気温度1000℃H2(1
0％）−Ｈ2(90％）雰囲気で５時間行ない試験後試料を
取出して、ピック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する。この値を２枚の試験片面
積（50×50mm）で割算したピックアップ面積の割合をも
ってピックアップ発生率とした。ピックアップ発生率を
第１図に、また試験後の表面性状観察結果を表−２に示
した。Atmosphere temperature 1000 ℃ H 2 (1
0%)-H 2 (90%) atmosphere is performed for 5 hours, the sample is taken out after the test, and the area of the portion where the pickup is generated is measured using an image analyzer. The ratio of the pickup area obtained by dividing this value by the area of two test pieces (50 × 50 mm) was taken as the pickup occurrence rate. The pickup occurrence rate is shown in FIG. 1, and the surface property observation results after the test are shown in Table 2.
第１図に示したピックアップ発生率の幅は１０回の試験
におけるバラツキを示している。第１図に示したピック
アップ発生率の小さい順から挙げると、NO.８：Cr2O3７
０％−Al2O3３０％溶射物、NO.６：Cr2O3５０％−Al2O3
５０％溶射物、NO.７： Cr2O3７０％−Al2O3３０％焼結体、NO.５： Cr2O3５０％−Al2O3５０％焼結体、NO.４： Cr2O3３０％−Al2O3７０％溶射物、NO.３： Cr2O3３０％−Al2O3７０％焼結体、NO.１０： Cr2O3８５％−Al2O3１５％溶射物、NO.９： Cr2O3８５％−Al2O3１５％焼結体、NO.２： Cr2O3２０％−Al2O3８０％溶射物、NO.１： Cr2O3２０％−Al2O3８０％焼結体、NO.１１：耐熱鋳鋼
である。 The range of pick-up occurrence rates shown in FIG. 1 shows variations in 10 tests. From the smallest pick-up occurrence rate shown in Fig. 1, NO.8: Cr 2 O 3 7
0% -Al 2 O 3 30% sprayed material, NO. 6: Cr 2 O 3 50% -Al 2 O 3
50% spray product, NO.7: Cr 2 O 3 70 % -Al 2 O 3 30% sintered, NO.5: Cr 2 O 3 50 % -Al 2 O 3 50% sintered, NO.4 : Cr 2 O 3 30% -Al 2 O 3 70% sprayed material, NO. 3: Cr 2 O 3 30% -Al 2 O 3 70% sintered body, NO. 10: Cr 2 O 3 85% -Al 2 O 3 15% sprayed material, NO.9: Cr 2 O 3 85% -Al 2 O 3 15% sintered body, NO. 2: Cr 2 O 3 20% -Al 2 O 3 80% sprayed material, NO .1: Cr 2 O 3 20% -Al 2 O 3 80% sintered body, NO. 11: heat-resistant cast steel.
以上の結果からCr2O3を３０％以上含有しないと、ピッ
クアップの発生が極めて多くなり、当初の目的、即ち耐
ピックアップ性の良い材料としての条件を満足しない。
Cr2O3量３０％以上では耐ピックアップ性に優れるがCr2
O3量が７０％を越えると緻密で高強度の成形体を得るこ
とが困難となり、制約を受ける。即ち、粉体から製造し
た焼結体では、強度が不十分であることから、脆く機械
的な摩擦、衝撃により、表面に凹凸が発生し、そこを起
点として、ピックアップが多発する。他方、溶射物の場
合においてもCr2O3量が７０％を越えると溶射被膜の強
度不足に伴なう剥離の発生あるいは表面に微細な亀裂を
発生し、そのくぼみを起点として、ピックアップが発生
する。From the above results, if Cr 2 O 3 is not contained in an amount of 30% or more, pick-up is extremely generated, and the original purpose, that is, the condition as a material having good pick-up resistance is not satisfied.
When the Cr 2 O 3 content is 30% or more, the pick-up resistance is excellent, but Cr 2
If the amount of O 3 exceeds 70%, it becomes difficult to obtain a dense and high-strength molded product, which is a limitation. That is, since the sintered body manufactured from powder has insufficient strength, it is brittle and mechanical friction and impact generate unevenness on the surface, and the pick-up frequently occurs from there. On the other hand, even in the case of thermal sprayed products, when the amount of Cr 2 O 3 exceeds 70%, peeling occurs due to insufficient strength of the thermal spray coating or fine cracks occur on the surface, and pickup occurs starting from the depressions. To do.
この様にCr2O3量を３０〜７０％（好ましくは４０〜７
０％）含有し、残部Al2O3からなる被膜層をロールに構
成することにより、ピックアップ原料との反応性に乏し
く、かつ使用中の亀裂発生に伴なうピックアップ発生率
の低い熱処理炉用ロールの提供が可能となる。Thus, the amount of Cr 2 O 3 is 30 to 70% (preferably 40 to 7).
0%) and the balance is composed of a coating layer consisting of Al 2 O 3 for the roll, so that it has a low reactivity with pickup raw materials and a low pickup occurrence rate due to cracking during use. It becomes possible to provide rolls.
以下、実施例について説明する。Examples will be described below.
実施例 耐熱鋳鋼製ロール表面にCr2O3(30％）−Al2O3(70％）、
Cr2O3(50％）−Al2O3(50％）、Cr2O3(85％）−Al2O3(15
％）の夫々から成る溶射被膜を形成し、表面平滑度が１
００μｍ以下になるように研削し熱処理炉用ロールとし
た。Example Cr 2 O 3 (30%)-Al 2 O 3 (70%) on the surface of a heat-resistant cast steel roll,
Cr 2 O 3 (50%)-Al 2 O 3 (50%), Cr 2 O 3 (85%)-Al 2 O 3 (15
%) And the surface smoothness is 1
A roll for a heat treatment furnace was obtained by grinding so as to have a diameter of 00 μm or less.
また、粉末の焼結により製造したCr2O3(50％）−Al2O
3(50％）およびCr2O3(20％）−Al2O3(80％）の各焼結体
を、表面平滑度が１００μｍ以下になるように研削し、
焼結体スリーブを製作した。In addition, Cr 2 O 3 (50%)-Al 2 O produced by sintering powder
3 (50%) and Cr 2 O 3 (20%)-Al 2 O 3 (80%) sintered bodies were ground so that the surface smoothness was 100 μm or less,
A sintered sleeve was manufactured.
さらに、従来品として、耐熱鋳鋼製ロールを用意した。Further, a heat-resistant cast steel roll was prepared as a conventional product.
上記６種類の熱処理炉用ロールを実際の鋼板熱処理炉
（温度800〜1050℃、N2-H2-H2O雰囲気）で１８００時間
使用した結果を表−３に示す。Table 3 shows the results of using the above six types of heat treatment furnace rolls in an actual steel plate heat treatment furnace (temperature: 800 to 1050 ° C, N 2 -H 2 -H 2 O atmosphere) for 1800 hours.
（発明の効果） 上記、実施例の結果からも明らかな如く本発明のロール
は、耐ロールピックアップ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ので産業上稗益するころが極
めて大である。 (Effects of the Invention) As is clear from the results of the above examples, the roll of the present invention is extremely excellent in roll pick-up resistance and greatly contributes to the roll life extension. .
第１図は各種試料のピックアップ発生率を示したもので
ある。FIG. 1 shows pickup occurrence rates of various samples.
Claims (1)
属板を支持し、これを搬送する熱処理炉用ロールにおい
て、金属板を支持するロール表面が３０〜７０重量％の
Ｃｒ２Ｏ３と、残部Ａｌ２Ｏ３の２種類の酸化物から成
ることを特徴とする熱処理炉用ロール。1. A roll for heat treatment furnace which supports and conveys a metal plate of a material to be heat treated in a heat treatment furnace in a high temperature atmosphere, wherein the roll surface supporting the metal plate has a Cr 2 O 3 content of 30 to 70% by weight. And a balance consisting of two kinds of oxides, Al 2 O 3 , and a roll for a heat treatment furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58109880A JPH0657873B2 (en) | 1983-06-18 | 1983-06-18 | Roll for heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58109880A JPH0657873B2 (en) | 1983-06-18 | 1983-06-18 | Roll for heat treatment furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS602661A JPS602661A (en) | 1985-01-08 |
| JPH0657873B2 true JPH0657873B2 (en) | 1994-08-03 |
Family
ID=14521506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58109880A Expired - Lifetime JPH0657873B2 (en) | 1983-06-18 | 1983-06-18 | Roll for heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0657873B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE47675T1 (en) * | 1984-11-14 | 1989-11-15 | Centre Rech Metallurgique | METHOD OF MARKING THE SURFACE OF A ROLLER. |
| JPS6414154U (en) * | 1987-07-13 | 1989-01-25 | ||
| JPH0396342U (en) * | 1990-01-19 | 1991-10-02 | ||
| JPH049424A (en) * | 1990-02-22 | 1992-01-14 | Kubota Corp | Hearth roll for steel heat-treating furnace |
| WO2022054559A1 (en) * | 2020-09-08 | 2022-03-17 | トーカロ株式会社 | Hearth roll |
| CN112553565B (en) * | 2020-11-13 | 2023-04-21 | 厦门金鹭特种合金有限公司 | Interlayer for sintering hard alloy pressed product |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS512284A (en) * | 1974-06-26 | 1976-01-09 | Yaesu Rehabili Co Ltd | NYUYO KUSOCHI |
-
1983
- 1983-06-18 JP JP58109880A patent/JPH0657873B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS602661A (en) | 1985-01-08 |
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