JPH02141522A - Hearth roll for heat treatment furnace - Google Patents
Hearth roll for heat treatment furnaceInfo
- Publication number
- JPH02141522A JPH02141522A JP29512588A JP29512588A JPH02141522A JP H02141522 A JPH02141522 A JP H02141522A JP 29512588 A JP29512588 A JP 29512588A JP 29512588 A JP29512588 A JP 29512588A JP H02141522 A JPH02141522 A JP H02141522A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- sintered body
- layer
- body layer
- barrel part
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims description 7
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 3
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 3
- 239000002344 surface layer Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 abstract description 16
- 238000005245 sintering Methods 0.000 abstract description 10
- 239000000956 alloy Substances 0.000 abstract description 7
- 229910045601 alloy Inorganic materials 0.000 abstract description 6
- 239000002775 capsule Substances 0.000 abstract description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract description 3
- 125000006850 spacer group Chemical group 0.000 abstract description 3
- 238000012856 packing Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 29
- 230000000694 effects Effects 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 229910001208 Crucible steel Inorganic materials 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001513 hot isostatic pressing Methods 0.000 description 2
- OKJPEAGHQZHRQV-UHFFFAOYSA-N iodoform Chemical compound IC(I)I OKJPEAGHQZHRQV-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 102100037328 Chitotriosidase-1 Human genes 0.000 description 1
- 101000879661 Homo sapiens Chitotriosidase-1 Proteins 0.000 description 1
- 229910002061 Ni-Cr-Al alloy Inorganic materials 0.000 description 1
- 229910000946 Y alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000008393 encapsulating agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、熱処理炉内におけるハースロール（鋼材搬送
用ロール）に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hearth roll (a roll for conveying steel materials) in a heat treatment furnace.
鋼板連続焼鈍炉等の鋼材熱処理炉（炉温：約６００〜１
３００°Ｃ）におけるハースロールとして、従来より耐
熱鋳鋼、代表的にはＪＩＳ Ｇ５１２２ Ｓ ＣＨＩ３
．５ＣＨ２２等の高Ｃｒ−高Ｎｉ系、またはそのＦｅの
一部がＹ、Ｃ０．Ｗ等で置換された高級耐熱鋳鋼からな
るロールが使用されてきた。Steel heat treatment furnaces such as steel plate continuous annealing furnaces (furnace temperature: approx. 600 to 1
Conventionally, heat-resistant cast steel, typically JIS G5122 S CHI3, has been used as hearth rolls at temperatures up to 300°C.
．． High Cr-high Ni system such as 5CH22, or a part of its Fe is Y, C0. Rolls made of high-grade heat-resistant cast steel substituted with W or the like have been used.
高温雰囲気炉内における上記ハースロールの実使用上量
も問題となるのは、そのロール表面にビルドアップが生
じ易いことである。ビルドアップは、ハースロールに担
持されて搬送される鋼材の表面酸化物（スケール）や金
属粉がロール表面に付着し、化学反応により凝着してロ
ール表面に肌荒れ・損傷が生じる現象であり、−旦ピル
ドアップが発生すると、後続する鋼材の表面に疵が付き
、その品質や歩留りを著しく低下させる原因となる。The practical use of the hearth roll in a high-temperature atmosphere furnace is also problematic because build-up tends to occur on the roll surface. Build-up is a phenomenon in which surface oxides (scale) and metal powder of steel materials carried and transported on hearth rolls adhere to the roll surface and adhere due to chemical reactions, causing roughness and damage to the roll surface. - Once pill-up occurs, the surface of subsequent steel products will be scratched, causing a significant decrease in quality and yield.
この対策として、近時はハースロール表面に、Ｃｒ、Ａ
ｎ、Ｙを含むＮｉ基合金（３５Ｃｒ −１０Ａｌ−０．
５Ｙ−Ｎｉ系）の被覆層を形成し、あるいはアルミナＣ
ＡＥ□０３）やジルコニア（ＺｒＯｚ）等のセラミック
を溶射被覆することも試みられている。As a countermeasure to this problem, recently, the surface of the hearth roll is coated with Cr, A, etc.
Ni-based alloy containing n, Y (35Cr-10Al-0.
5Y-Ni system) or alumina C
Attempts have also been made to thermally spray coat ceramics such as AE□03) and zirconia (ZrOz).
前記Ｎｉ基合金でハースロール表面を被覆することによ
りビルドアップ減少効果を得ることはできるが、１００
０℃をこえる高温域における効果は小さく、しかもその
被覆層は溶射により形成されるので、ロール母材表面と
の密着性が低く、剥離し易い欠点がある。またセラミッ
ク溶射皮膜は、鋼材表面スケールの溶融物に対する濡れ
性が小さく、卓抜したビルドアップ抵抗性を示すけれど
も、機械的・熱的衝撃による亀裂・剥離を生じ易く、ロ
ール保護膜としての安定性に乏しい。Although it is possible to reduce build-up by coating the hearth roll surface with the Ni-based alloy,
The effect at high temperatures above 0° C. is small, and since the coating layer is formed by thermal spraying, it has the disadvantage of poor adhesion to the surface of the roll base material and easy peeling. Furthermore, although ceramic sprayed coatings have low wettability to molten materials on steel surface scales and exhibit excellent build-up resistance, they are susceptible to cracking and peeling due to mechanical and thermal shock, and are not stable as roll protective coatings. poor.
本発明は上記問題点を解決することを目的としてなされ
たものである。The present invention has been made to solve the above problems.
〔課題を解決するための手段および作用〕本発明に係る
ハースロールは、ロール胴部の表層がＡ？０．５〜１５
％、Ｃｒ：３０〜６０％、残部は実質的にＣＯからなり
、所望によりＣｏの一部が、Ｎｂ ： ０．５〜１０％
、 Ｚｒ：０．５〜１０％、Ｍｏｎ０゜５〜１０％、Ｗ
： ０．５〜１０％、Ｙ ： ０．１〜１％の群から選
ばれる１種ないしは２種以上、合計１０％以下の元素を
以て置換されている化学成分組成を有する金属粉末の焼
結体からなることを特徴としている。 本発明のハース
ロールの胴部表層をなす焼結体の成分限定理由は次のと
おりである。[Means and effects for solving the problem] In the hearth roll according to the present invention, the surface layer of the roll body is A? 0.5-15
%, Cr: 30-60%, the remainder substantially consists of CO, and if desired, a part of Co, Nb: 0.5-10%
, Zr: 0.5~10%, Mon0°5~10%, W
: 0.5-10%, Y: 0.1-1% A sintered body of metal powder having a chemical composition substituted with one or more elements selected from the group of 10% or less in total. It is characterized by consisting of. The reasons for limiting the components of the sintered body forming the surface layer of the body of the hearth roll of the present invention are as follows.
Ｃｏ ： Ｂａ１ａｎｃｅ
Ｃｏは高温強度が高く、またＣｒとの合金化により良好
な耐酸化性を示す元素であり、本発明において胴部表層
をなす焼結体の高温特性を確保するための基本成分であ
る。Co: Ba1ance Co is an element that has high high-temperature strength and exhibits good oxidation resistance when alloyed with Cr, and is a basic component for ensuring high-temperature properties of the sintered body forming the surface layer of the body in the present invention. be.
Ａｌ２．：０．５〜１５％
Ａｌ２．は高温雰囲気において焼結体層の表面に緻密で
極めて安定な酸化皮膜を形成する。その酸化皮膜は、鋼
材の表面酸化物（スケール）との反応性が小さく、焼結
体層に良好な耐ビルドアップ性を付与する。この効果は
、０．５％以上のＡｌ２．含有により得られる。Ａｌ量
の増加と共にその効果は向上するが、多量の添加に伴っ
て、焼結体層の靭性・延性の低下をみるので、１５％を
上限とする。Al2. :0.5-15% Al2. forms a dense and extremely stable oxide film on the surface of the sintered body layer in a high temperature atmosphere. The oxide film has low reactivity with surface oxides (scale) of the steel material, and provides good build-up resistance to the sintered body layer. This effect is due to the presence of 0.5% or more Al2. Obtained by containing. Although the effect improves as the amount of Al increases, the toughness and ductility of the sintered body layer decreases with the addition of a large amount, so the upper limit is set at 15%.
好ましくは、１〜１０％である。Preferably it is 1 to 10%.
Ｃｒ：３０〜６０％
Ｃｒは、Ｃｏとの合金化により焼結体層の耐酸化性を高
めるほか、焼結体層表面に高温での安定性にすぐれた酸
化皮膜を形成する。その酸化皮膜も、鋼材の表面スケー
ルと焼結体層との反応を抑制し、ビルドアップ抵抗性を
高める。この効果は、含有量３０％以上において顕著に
あられれる。しかし、６０％をこえると、焼結体層が脆
弱化するので、６０％を上限とする。Cr: 30-60% Cr not only improves the oxidation resistance of the sintered body layer by alloying with Co, but also forms an oxide film with excellent stability at high temperatures on the surface of the sintered body layer. The oxide film also suppresses the reaction between the surface scale of the steel material and the sintered body layer, increasing the build-up resistance. This effect is noticeable when the content is 30% or more. However, if it exceeds 60%, the sintered body layer becomes brittle, so 60% is the upper limit.
本発明ハースロールの胴部表面の焼結体層は、必要に応
じて添加される下記元素の１種または２種以上を含有す
る。２種以上を複合含有する場合の合計の含有量の上限
を１０％としたのは、それらの元素の多量添加に伴う耐
酸化性の低下をさけるためである。The sintered body layer on the body surface of the hearth roll of the present invention contains one or more of the following elements added as necessary. The reason why the upper limit of the total content when two or more elements are contained in combination is set at 10% is to avoid a decrease in oxidation resistance due to the addition of a large amount of these elements.
Ｎｂ：０．５〜１０％ Ｎｂは焼結体層の高温強度の向上に寄与する。Nb: 0.5-10% Nb contributes to improving the high temperature strength of the sintered body layer.
その効果は０．５％から認められ、含有量の増加に伴っ
て強められるが、１０％をこえると焼結体層の耐酸化性
が低下するので、０．５〜１０％とする。好ましくは１
〜８％である。なお、Ｎｂは通常Ｔａを付随する。Ｔａ
は本発明においてＮｂと同効物質であるので、本明細書
のＮｂの表示は、Ｎｂ単体のほか、Ｔａを付随するＮｂ
を意味し、その場合のＮｂ含有量の規定は両元素の合計
量を意味しているものとする。The effect is observed from 0.5% and becomes stronger as the content increases, but if it exceeds 10%, the oxidation resistance of the sintered body layer decreases, so it is set at 0.5 to 10%. Preferably 1
~8%. Note that Nb usually accompanies Ta. Ta
is a substance with the same effect as Nb in the present invention, so Nb in this specification is not only Nb alone but also Nb accompanied by Ta.
In this case, the Nb content is defined as the total amount of both elements.
Ｚ ｒ ： ０．５〜ｌＯ％
Ｚｒは上記ＮｂおよびＴａと同じように焼結体層の高温
強度を高める。この効果を得るには０．５％を必要とし
、その増量に伴って効果の増加をみるが、１０％をこえ
ると焼結体層の耐酸化性が低くなるので、０．５〜１０
％とする。好ましくは１〜８％である。Zr: 0.5-1O% Zr increases the high-temperature strength of the sintered body layer in the same way as the above-mentioned Nb and Ta. To obtain this effect, 0.5% is required, and the effect increases as the amount increases, but if it exceeds 10%, the oxidation resistance of the sintered body layer decreases, so 0.5% to 10% is required.
%. Preferably it is 1 to 8%.
Ｍｏ：０．５〜１０％ Ｍｏは焼結体層の強度、特に高温強度を大きく高める。Mo: 0.5-10% Mo greatly increases the strength of the sintered body layer, especially the high temperature strength.
その効果は、０．５％からあられれ、含有量と共に増大
するが、１０％をこえると、低融点酸化物の生成に伴う
耐酸化性の低下を招くので、０゜５〜１０％とする。好
ましくは１〜７％である。The effect starts from 0.5% and increases with the content, but if it exceeds 10%, it causes a decrease in oxidation resistance due to the formation of low melting point oxides, so it is set at 0.5 to 10%. . Preferably it is 1 to 7%.
Ｗ： ０．５〜１０％
Ｗは上記Ｍｏと同じく焼結体層の高温強度の向上に奏効
する。この効果を得るには、０．５％以上を必要とする
が、多量の添加は、高温域における焼結体層の耐酸化性
の極端な低下を引き起こすので、１０％をこえてはなら
ない。好ましくは１〜７％である。W: 0.5 to 10% W is effective in improving the high-temperature strength of the sintered body layer, like the above-mentioned Mo. To obtain this effect, 0.5% or more is required, but addition of a large amount causes an extreme decrease in the oxidation resistance of the sintered body layer in a high temperature range, so the content should not exceed 10%. Preferably it is 1 to 7%.
Ｙ ： ０．１〜１％
Ｙは活性金属であり、焼結体層表面の酸化皮膜の密着力
を高め、熱処理炉内の温度変化に伴う酸化皮膜のスポー
リング破壊を防止する。この効果は含有量０．１％以上
において得られるが、１％をこえると、優先酸化が生じ
添加効果が飽和するので、０．１〜１％とする。好まし
くは、０．５〜０．８％である。Y: 0.1-1% Y is an active metal that increases the adhesion of the oxide film on the surface of the sintered body layer and prevents spalling and destruction of the oxide film due to temperature changes in the heat treatment furnace. This effect can be obtained at a content of 0.1% or more, but if the content exceeds 1%, preferential oxidation occurs and the effect of addition becomes saturated, so the content is set at 0.1 to 1%. Preferably it is 0.5 to 0.8%.
第１図は本発明のハースロールの断面構造の例を示して
いる。（１０）はその表面に被加熱鋼材が担持される胴
部であり、（２０）はその胴部に取付けられた軸体であ
る。ロール胴部（１０）は、金属材料からなる中空円筒
体である基体（１１）の外周面を前記規定の成分組成を
有する焼結体層（１２）で被覆した積層構造を有してい
る。その胴部の表面層をなす焼結体層（１２）は、前記
成分組成を有する金属粉末（単一の金属の粉末のほか、
２種以上の金属粉末を所定の成分組成となるように配合
した混合粉末でもよい）を焼結原料とし、公知の焼結体
形成法、例えばホットプレス法や熱間静水圧加圧焼結法
を適用し、基体である中空円筒体（１１）の外周面に焼
結原料粉末充填層を与え加圧下に焼結処理する方法、ま
たは冷間静水圧加圧成形法により中空円筒体（１１）の
外周面に前記金属粉末の圧粉層を与えたのち焼結処理す
る方法等により形成することができる。焼結処理温度は
、概ね１１５０〜１２５０”ｃとしてよい。また、その
焼結体層（１２）の層厚は約１〜１０（財）であればよ
い。FIG. 1 shows an example of the cross-sectional structure of the hearth roll of the present invention. (10) is a body on which the heated steel material is supported, and (20) is a shaft attached to the body. The roll body (10) has a laminated structure in which the outer peripheral surface of a base (11), which is a hollow cylinder made of a metal material, is covered with a sintered body layer (12) having the above-described specified composition. The sintered body layer (12) forming the surface layer of the body is made of metal powder (in addition to single metal powder) having the above-mentioned composition.
A mixed powder in which two or more metal powders are blended to have a predetermined composition) is used as a sintering raw material, and a known sintered body forming method is used, such as a hot pressing method or a hot isostatic pressing sintering method. The hollow cylinder (11) is formed by a method in which a layer of sintering raw material powder is applied to the outer peripheral surface of the hollow cylinder (11) that is the base body and sintered under pressure, or by a cold isostatic pressing method. It can be formed by a method of applying a powder layer of the metal powder to the outer peripheral surface of the metal powder and then sintering it. The sintering temperature may be approximately 1150 to 1250''c. The thickness of the sintered body layer (12) may be approximately 1 to 10 cm.
なお、第１図では、ロール軸（２０）が胴部（１０）を
貫通する長尺材であり、その軸心に冷却水送通孔（２１
）が形成された内部水冷構造を有し、またそのロール軸
（２０）と胴部（１０）とがスペーサ（３０，３０）を
介して嵌着された構成を有しているが、むろんそのロー
ル軸（２０）の形状や内部水冷構造および胴部（１０）
との嵌め合せ構造等は図示の例に限定されるものではな
い。また、胴部（１０）の基体（１１）や軸体（２０）
の材質は、例えば従来よりこの種のロールの構成材料と
して使用されている耐熱合金材料、例えば５ＣＨ１３，
５ＣＨ２２等、使用環境条件に必要な材質特性を有する
ものを任意に選択使用すればよい。In addition, in FIG. 1, the roll shaft (20) is a long material that penetrates the body (10), and the cooling water passage hole (21
), and the roll shaft (20) and body (10) are fitted through spacers (30, 30). Shape of roll shaft (20), internal water cooling structure, and body (10)
The fitting structure and the like are not limited to the illustrated example. In addition, the base body (11) of the body (10) and the shaft body (20)
The material is, for example, a heat-resistant alloy material conventionally used as a constituent material of this type of roll, such as 5CH13,
5CH22 or the like may be arbitrarily selected and used, having material characteristics required for the usage environment conditions.
（Ｉ）供試材の調製
ロール胴部基体（１１）として耐熱合金（２５Ｃｒ−２
ＯＮｉ−ＩＮｂ−０，４Ｃ−Ｆｅ、５ＣＨ２２相当）型
中空円筒体（外径１３０ｍｍ、胴長４８０論）、および
焼結原料として所定成分組成を有する金属粉末（平均粒
径２０μｍ）をそれぞれ準備し、熱間静水圧加圧焼結工
程に従い、前記中空円筒体の外周面側にカプセル材を用
いて金属粉末を充填し、脱気したのち密封し、１２００
ｋｇｆ／ｃｎｌの加圧下に１２００°Ｃで２時間を要し
て焼結処理を行った。焼結処理後、機械加工によりカプ
セル材の除去および焼結体層の（１２）表面仕上げを行
ってロール胴部（１０）を得た。機械加工後の焼結体層
の層厚は４ ｍｍである。(I) Preparation of test material The roll body base (11) is a heat-resistant alloy (25Cr-2
ONi-INb-0,4C-Fe, 5CH22 equivalent) type hollow cylinder (outer diameter 130 mm, body length 480 mm) and metal powder (average particle size 20 μm) having a predetermined composition as a sintering raw material were prepared. , according to the hot isostatic pressing sintering process, the outer peripheral surface of the hollow cylindrical body was filled with metal powder using a capsule material, degassed, and then sealed.
The sintering process was performed at 1200°C for 2 hours under a pressure of kgf/cnl. After the sintering treatment, the encapsulant was removed by machining and the surface of the sintered body layer (12) was finished to obtain a roll body (10). The layer thickness of the sintered body layer after machining is 4 mm.
そのロール胴部（１０）を、別途準備したロール軸体（
２０，２０）にスペーサ（３０）を介して嵌着し第１図
に示すハースロールに組立てた。The roll body (10) is attached to a separately prepared roll shaft (
20, 20) via a spacer (30), and assembled into a hearth roll shown in FIG.
〔ＩＩ）ビルドアップ試験
上記ハースロールを試験炉（炉温１１５０°Ｃ）内に配
置し、第２図に示す ようにそのロール面に普通鋼々板
（Ｓ）をのせた状態でロールを５ＲＰＭの回転速度で回
転させ、延べ１ｏｏｏ時間操業後のロール胴部表面（焼
結体層表面）のビルドアップ発生の有無を目視観察する
。[II) Build-up test The above hearth roll was placed in a test furnace (furnace temperature: 1150°C), and the roll was rotated at 5 RPM with an ordinary steel plate (S) placed on the roll surface as shown in Figure 2. After operating for a total of 100 hours, the roll body surface (sintered body layer surface) was visually observed for build-up.
第１表に各供試ハースロールの胴部表層の成分構成とビ
ルドアップ試験結果を示す。表中、Ｎ０． １〜７は、
胴部表層が本発明所定の成分組成を有する焼結体層から
なる発明例である。Ｎ０．１０ ＬとＮ０．１０２は比
較例であり、Ｎ０．１０１は従来の代表的ハースロール
材である５ＣＨ２２相当の耐熱鋳鋼からなる遠心鋳造中
空筒体をロール胴部とした例、Ｎ０． １０２は、Ｎ０
． １〜７のロール胴部基体と同じ中空筒体の表面にＮ
１−Ｃｒ−ＡＮ−Ｙ系合金被覆層を形成した例である。Table 1 shows the composition of the body surface layer of each sample hearth roll and the results of the build-up test. In the table, N0. 1 to 7 are
This is an example of the invention in which the surface layer of the body is composed of a sintered body layer having a predetermined composition according to the present invention. No. 10 L and No. 102 are comparative examples, No. 101 is an example in which the roll body is a centrifugally cast hollow cylinder made of heat-resistant cast steel equivalent to 5CH22, which is a typical conventional hearth roll material, and No. 102 is N0
．． N on the surface of the same hollow cylinder as the roll body base of Nos. 1 to 7.
This is an example in which a 1-Cr-AN-Y alloy coating layer was formed.
また、表中、「耐ビルドアップ性」欄の「Ｏ」はビルド
アップ発生なし、「××」はビルドアップ顕著に発生、
「×」はやや軽度であるが、鋼板の表面疵発生の原因と
なる程のビルドアップが発生したことをそれぞれ意味し
ている。In addition, in the table, "O" in the "Buildup Resistance" column indicates that no buildup occurs, and "XX" indicates that buildup significantly occurs.
"X" means that build-up occurred, although it was somewhat mild, to the extent that it caused surface flaws on the steel plate.
このＫＭ結果から、従来のハースロール（Ｎ０．１０１
）およびＮｉ−Ｃｒ−Ａｌ！、−Ｙ系合金被覆層を有
するロール（Ｎ１１１０２）ではビルドアップの発生を
避は得ないのに対し、発明例Ｎα１〜７は、高温長時間
操業においても安定した耐ビルドアップ性を有している
ことがわかる。From this KM result, the conventional hearth roll (N0.101
) and Ni-Cr-Al! , -Y-based alloy coating layer (N11102) inevitably causes build-up, whereas invention examples Nα1 to 7 have stable build-up resistance even in high-temperature long-term operation. I know that there is.
本発明のハースロールは、その胴部表層が一定の成分組
成を有する焼結体層であることにより、１０００℃をこ
える高温使用条件下にもすぐれて安定した耐ビルドアッ
プ性を有している。また、その焼結体層は胴部基体との
密着力が強く亀裂・剥離を生じ難い。従って、本発明の
ハースロールは長期に亘って肌荒れ等のない健全な表面
を保持し、ロールメンテナンスに要するコスト・労力の
大幅な低減、熱処理炉操業効率の向上、被処理鋼材の表
面品質・歩留間上等に奏効する。The hearth roll of the present invention has excellent and stable build-up resistance even under high-temperature usage conditions of over 1000°C because the surface layer of the body is a sintered body layer having a certain composition. . In addition, the sintered body layer has strong adhesion to the body base and is unlikely to crack or peel. Therefore, the hearth roll of the present invention maintains a healthy surface without roughness over a long period of time, significantly reduces the cost and labor required for roll maintenance, improves the operating efficiency of heat treatment furnaces, and improves the surface quality and speed of the steel to be treated. It is effective for Ruma Jyoto.
第１図は本発明ハースロールの断面構造の例を示す図、
第２図は実施例関係のビルドアップ試験要領を示す説明
図である。
１０：ハースロール胴部、１１；胴部基体、１２；焼結
体層、２０：ロール軸、Ｓ：鋼板。FIG. 1 is a diagram showing an example of the cross-sectional structure of the hearth roll of the present invention;
FIG. 2 is an explanatory diagram showing the procedure of the build-up test related to the embodiment. 10: hearth roll body, 11: body base, 12: sintered body layer, 20: roll shaft, S: steel plate.
Claims (1)
：３０〜６０％を含有し、残部は実質的にＣｏである金
属粉末の焼結体からなることを特徴とする耐ビルドアッ
プ性にすぐれた熱処理炉用ハースロール。 ２、ロール胴部の表層が、Ａｌ：０．５〜１５％、Ｃｒ
：３０〜６０％、およびＮｂ：０．５〜１０％、Ｚｒ：
０．５〜１０％、Ｍｏ：０．５〜１０％、Ｗ：０．５〜
１０％、Ｙ：０．１〜１％の群から選ばれる１種ないし
は２種以上の元素、合計１０％以下を含有し、残部は実
質的にＣｏである金属粉末の焼結体からなることを特徴
とする耐ビルドアップ性にすぐれた熱処理炉用ハースロ
ール。[Claims] 1. The surface layer of the roll body contains Al: 0.5 to 15%, Cr
A hearth roll for a heat treatment furnace having excellent build-up resistance, characterized by being made of a sintered body of metal powder containing 30 to 60% of Co and the remainder being substantially Co. 2. The surface layer of the roll body is Al: 0.5-15%, Cr
:30-60%, and Nb:0.5-10%, Zr:
0.5-10%, Mo: 0.5-10%, W: 0.5-10%
10%, Y: 0.1 to 1% of one or more elements selected from the group, a total of 10% or less, and the remainder is substantially Co. A hearth roll for heat treatment furnaces with excellent build-up resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29512588A JPH02141522A (en) | 1988-11-22 | 1988-11-22 | Hearth roll for heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29512588A JPH02141522A (en) | 1988-11-22 | 1988-11-22 | Hearth roll for heat treatment furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02141522A true JPH02141522A (en) | 1990-05-30 |
Family
ID=17816611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29512588A Pending JPH02141522A (en) | 1988-11-22 | 1988-11-22 | Hearth roll for heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02141522A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102649991A (en) * | 2011-02-25 | 2012-08-29 | 上海宝钢设备检修有限公司 | High-temperature-resistant water-cooling furnace bottom roll |
| CN107760931A (en) * | 2017-10-22 | 2018-03-06 | 孙荣华 | Stabilizing roller built-up welding cobalt-base alloys working face |
-
1988
- 1988-11-22 JP JP29512588A patent/JPH02141522A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102649991A (en) * | 2011-02-25 | 2012-08-29 | 上海宝钢设备检修有限公司 | High-temperature-resistant water-cooling furnace bottom roll |
| CN107760931A (en) * | 2017-10-22 | 2018-03-06 | 孙荣华 | Stabilizing roller built-up welding cobalt-base alloys working face |
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