JP2931384B2 - Continuous casting roll with excellent heat crack resistance - Google Patents
Continuous casting roll with excellent heat crack resistanceInfo
- Publication number
- JP2931384B2 JP2931384B2 JP24443490A JP24443490A JP2931384B2 JP 2931384 B2 JP2931384 B2 JP 2931384B2 JP 24443490 A JP24443490 A JP 24443490A JP 24443490 A JP24443490 A JP 24443490A JP 2931384 B2 JP2931384 B2 JP 2931384B2
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- JP
- Japan
- Prior art keywords
- roll
- continuous casting
- thermal spray
- crack resistance
- base material
- 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 - Fee Related
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Landscapes
- Coating By Spraying Or Casting (AREA)
- Heat Treatment Of Articles (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、高温下で繰返し加熱・冷却を受ける連続鋳
造ロールにおいて、特に耐ヒートクラック性に優れた連
続鋳造ロールに関するものである。Description: TECHNICAL FIELD The present invention relates to a continuous casting roll that is repeatedly heated and cooled at a high temperature, and particularly to a continuous casting roll excellent in heat crack resistance.
（従来の技術） 連続鋳造ロールは、鋳片に強く押し付けられており、
鋳片と接触している部分が局部的に加熱され、すぐに冷
却されるため、ロール表面に引張残留応力が生じやす
く、早期にヒートクラックが発生するという問題があ
る。このヒートクラックはロールにかかる軸方向の曲げ
応力によって進展し、場合によってはロールが折損する
こともあるため、連続鋳造ロールは耐ヒートクラック性
に優れている必要がある。(Prior art) A continuous casting roll is strongly pressed against a slab,
Since the portion in contact with the slab is locally heated and immediately cooled, there is a problem that a tensile residual stress is likely to be generated on the roll surface and a heat crack is generated at an early stage. Since the heat crack develops due to the axial bending stress applied to the roll, and the roll may be broken in some cases, the continuous casting roll needs to have excellent heat crack resistance.
従来の連続鋳造ロールには、低合金鋼素地ロールの外
周面に11〜17Cr−Ni系鋼を肉盛したロールが使用されて
いる。また、一部には、このような成分系に更にMo、Ｖ
などの合金成分を添加したタイプの肉盛ロールも見受け
られる。更には、Ni基又はCo基自溶性合金を溶射・溶融
処理したものも見られる。As a conventional continuous casting roll, a roll in which 11-17 Cr-Ni-based steel is overlaid on the outer peripheral surface of a low alloy steel base roll is used. In addition, in some cases, Mo, V
A build-up roll of a type to which an alloy component such as the above is added is also found. Further, there is also a case where a Ni-based or Co-based self-fluxing alloy is sprayed and melted.
（発明が解決しようとする課題） しかし、前述のように連続鋳造ロールは加熱・冷却を
繰返し受けるためにヒートクラックが発生しやすい環境
下で使用されることから、連続鋳造機の操業条件が過酷
になるにつれて、耐ヒートクラック性に優れた13Cr系肉
盛ロールであつても早期にヒートクラックが発生・進展
するケースがあり、ロールの使用寿命が著しく低下し、
整備費の増加や生産性の低下などの問題があった。(Problems to be Solved by the Invention) However, as described above, the continuous casting roll is used in an environment where heat cracks are likely to occur due to repeated heating and cooling, so that the operating conditions of the continuous casting machine are severe. As it becomes, even in the case of 13Cr-based overlay rolls with excellent heat crack resistance, there are cases where heat cracks occur and develop early, and the service life of the rolls is significantly reduced,
There were problems such as an increase in maintenance costs and a decrease in productivity.
本発明にこのような状況に鑑みてなされたものであっ
て、耐ヒートクラック性に優れた連続鋳造ロールを提供
することを目的とするものである。The present invention has been made in view of such circumstances, and has as its object to provide a continuous casting roll having excellent heat crack resistance.
（課題を解決するための手段） 本発明者等は、上記問題点を解決するために種々検討
を重ねた結果、母材ロール表面上の表層部及び溶射皮膜
の材質並びに線膨張係数を規定することにより、耐ヒー
トクラック性が飛躍的に向上し、ロールの長寿命化が可
能であることを見い出し、ここに本発明をなしたもので
ある。(Means for Solving the Problems) The present inventors have conducted various studies in order to solve the above problems, and as a result, have specified the material of the surface layer portion and the thermal spray coating on the surface of the base material roll and the linear expansion coefficient. As a result, it has been found that the heat crack resistance is remarkably improved, and the life of the roll can be extended, and the present invention is made here.
すなわち、本発明は、表層部が９〜20％Cr含有鋼から
なる母材ロールの胴部表面に、Fe:35〜65％、C:0.1〜2.
0％、Ni:30〜40％、Cr:9〜25％、B:0.5〜５％、Si:0.5
〜５％を含むFe基自溶性合金を溶射し、かつ該溶射皮膜
を溶融処理したロールであって、該溶射皮膜の溶融処理
後のRT（室温）〜500℃における線膨張係数がロール表
層部を形成する９〜20％Cr含有鋼のRT〜500℃における
線膨張係数と同じか又は小さいことを特徴とする耐ヒー
トクラック性に優れた連続鋳造ロールを要旨とするもの
である。That is, in the present invention, Fe: 35 to 65%, C: 0.1 to 2.
0%, Ni: 30-40%, Cr: 9-25%, B: 0.5-5%, Si: 0.5
A roll obtained by spraying a Fe-based self-fluxing alloy containing up to 5% and melt-treating the sprayed coating, wherein a coefficient of linear expansion at RT (room temperature) to 500 ° C. after the melted coating of the sprayed coating is a surface portion of the roll. The present invention is intended to provide a continuous casting roll excellent in heat crack resistance, characterized in that the coefficient of linear expansion at RT to 500 ° C. of a steel containing 9 to 20% Cr that forms is equal to or smaller than that of the steel.
以下に本発明を更に詳述する。 Hereinafter, the present invention is described in more detail.
（作用） 連続鋳造ロールは高温下で使用され、高温水蒸気や鋳
片との接触によって酸化や摩耗が生じやすい。また、操
業中に溶射層に発生したヒートクラックを通じて冷却水
が浸透し、溶射層とロール材との境界で酸化や腐食が進
行すると、溶射層の剥離が生じ易くなる。(Operation) The continuous casting roll is used at a high temperature, and is easily oxidized and worn due to contact with high-temperature steam or slab. In addition, when cooling water permeates through heat cracks generated in the sprayed layer during operation and oxidation and corrosion progress at the boundary between the sprayed layer and the roll material, the sprayed layer is likely to peel off.
したがって、母材ロールの表層部には、耐ヒートクラ
ック性の他に耐高温酸化性、耐食性、耐熱性、耐摩耗性
などが必要である。これらの性能を得るには、ロール表
層部のCr量は少なくとも９％以上必要であるが、20％を
超えるとその効果は飽和すると共に加熱・冷却による脆
化の危険性が増大する。Therefore, the surface layer of the base material roll needs to have high-temperature oxidation resistance, corrosion resistance, heat resistance, wear resistance, and the like, in addition to heat crack resistance. To obtain these properties, the amount of Cr in the surface layer of the roll must be at least 9% or more, but if it exceeds 20%, the effect is saturated and the risk of embrittlement due to heating and cooling increases.
このように耐高温酸化性や耐食性などを維持するに
は、ロール表層部のCr量が９〜20％であれば十分である
が、これらの特性をバランス良く向上させ、ロールを更
に長寿命化するには、母材ロールとして、13Cr−Ni系鋼
を使用するか、或いは適宜材質の母材ロール素材の表層
部に13Cr−Ni系鋼からなる溶接金属を肉盛した母材ロー
ルが望ましい。これは、共存元素やNi量にもよるが、13
Cr−Ni系鋼は、耐高温酸化性や耐熱性はもとより、高強
度であって良好な耐ヒートクラック性を示すためであ
る。In order to maintain high-temperature oxidation resistance and corrosion resistance as described above, it is sufficient if the amount of Cr in the surface layer of the roll is 9 to 20%. However, these characteristics are improved in a well-balanced manner and the life of the roll is further extended. To do this, it is desirable to use a 13Cr-Ni-based steel as the base material roll, or a base material roll in which a weld metal made of 13Cr-Ni-based steel is built up on the surface of a base material roll material of an appropriate material. This depends on the coexisting elements and the amount of Ni.
This is because the Cr-Ni-based steel has high strength and good heat crack resistance, as well as high temperature oxidation resistance and heat resistance.
ロール表面に溶射皮膜を形成すると、ロールが鋳片と
接触しても母材ロール素材は溶射皮膜を介して加熱され
るため、溶射層のないロールに比べて表面温度があがり
にくく、ヒートクラックが発生し難くなる。また、溶射
皮膜には方位性がないため、選択的なクラックが発生し
にくなり、連続鋳造ロールの耐ヒートクラック性を改善
できる。When a thermal spray coating is formed on the roll surface, the base material roll material is heated via the thermal spray coating even if the roll comes into contact with the slab, so the surface temperature is less likely to rise compared to a roll without a thermal spray layer, and heat cracks occur. Less likely to occur. Further, since the thermal spray coating has no orientation, selective cracks are less likely to occur, and the heat crack resistance of the continuous casting roll can be improved.
そのためには、以下の成分を含むFe基自溶性合金から
なる溶射皮膜とする必要がある。For that purpose, it is necessary to form a thermal spray coating made of a Fe-based self-fluxing alloy containing the following components.
Fe:35〜65％ Fe基自溶性合金の基本成分であるが、溶融処理した溶
射皮膜の線膨張係数（RT〜500℃）を９〜20％Cr含有鋼
のそれ以下にするには、35％以上が必要である。しか
し、65％を超えるとFe基自溶性合金の融点が高くなり、
溶射皮膜の溶融処理が著しく困難になる。したがつて、
Fe量は35〜65％の範囲とする。Fe: 35-65% It is a basic component of the Fe-based self-fluxing alloy, but in order to make the linear expansion coefficient (RT-500 ° C) of the sprayed coating that has been melt-processed lower than that of 9-20% Cr-containing steel, % Or more is required. However, if it exceeds 65%, the melting point of the Fe-based self-fluxing alloy increases,
The melting treatment of the thermal spray coating becomes extremely difficult. Therefore,
The Fe content is in the range of 35 to 65%.
C:0.1〜2.0％ Ｃは硬度の向上に寄与するが、0.1％未満ではその効
果が不十分であり、また2.0％を超えても効果は飽和し
てしまうので、Ｃ量は0.1〜2.0％の範囲とする。C: 0.1 to 2.0% C contributes to the improvement of hardness, but if it is less than 0.1%, its effect is insufficient, and if it exceeds 2.0%, the effect is saturated, so the C amount is 0.1 to 2.0%. Range.
Ni:30〜40％ Niは溶射皮膜の耐熱性や融点の降下に寄与するが、30
％未満ではその効果が得られず、また40％を超えると線
膨張係数が増加するので、Ni量は30〜40％の範囲とす
る。Ni: 30-40% Ni contributes to the heat resistance and the melting point of the thermal sprayed coating.
%, The effect cannot be obtained, and if it exceeds 40%, the linear expansion coefficient increases. Therefore, the Ni content is in the range of 30 to 40%.
Cr:9〜25％ Crは溶射皮膜の耐高温酸化性、耐熱性及び耐食性を向
上させるが、９％未満ではその効果が薄く、また25％を
超えてもその効果は殆ど変わらず、かえって溶融処理が
困難になるので、Cr量は９〜25％の範囲とする。Cr: 9 to 25% Cr improves the high-temperature oxidation resistance, heat resistance and corrosion resistance of the thermal sprayed coating. However, if it is less than 9%, its effect is small. Since the treatment becomes difficult, the Cr content is in the range of 9 to 25%.
B:0.5〜５％ Ｂは溶射皮膜の融点を下げ、NiやFe、Crの酸化を軽減
すると共に硬度の維持に寄与するが、0.5％未満ではそ
の効果が不十分であり、また５％を超えても効果が飽和
するので、Ｂ量は0.5〜５％の範囲とする。B: 0.5 to 5% B lowers the melting point of the thermal spray coating, reduces oxidation of Ni, Fe, and Cr and contributes to maintaining hardness. However, if less than 0.5%, the effect is insufficient, and 5% Even if it exceeds, the effect is saturated, so the B content is in the range of 0.5 to 5%.
Si:0.5〜５％ SiはＢと同様に溶射皮膜を低融点とし、NiやFe、Crの
酸化を減少させるが、0.5％未満ではその効果が十分に
発揮されず、また５％を超えてもその効果はあまり変わ
らず、かえって溶融処理を阻害してしまうので、Si量は
0.5〜５％の範囲とする。Si: 0.5 to 5% Si makes the thermal spray coating low melting point like B and reduces the oxidation of Ni, Fe, and Cr, but if it is less than 0.5%, its effect is not sufficiently exhibited, and if it exceeds 5%, However, the effect does not change much and rather inhibits the melting process.
The range is 0.5 to 5%.
以上の成分組成からなる溶射皮膜を形成することによ
る効果を長期にわたって得るためには、操業中に起こる
溶射皮膜の剥離を防止しなければならない。In order to obtain the effect of forming a thermal sprayed coating having the above-described composition over a long period of time, it is necessary to prevent the thermal sprayed coating from peeling off during operation.
そのためには、溶射のままの状態では、溶射皮膜とロ
ール素材の密着強さは非常に低く、使用開始直後に溶射
皮膜は剥離してしまうことを考慮して、本発明では、溶
射皮膜の耐剥離性を向上させるために溶融処理するもの
である。For this purpose, in the present invention, in consideration of the fact that the adhesion between the thermal spray coating and the roll material is very low in the state of the thermal spray coating, and the thermal spray coating peels off immediately after the start of use, in the present invention, the thermal spray coating has a high resistance. In order to improve the releasability, a melting treatment is performed.
更に、本発明者等は、溶融処理した溶射皮膜のRT〜50
0℃における線膨張係数が９〜20％Cr含有鋼のそれと同
じか若しくは小さいと、溶射皮膜の耐剥離性を著しく改
善できることを見い出した。Further, the present inventors, RT ~ 50 of the melt-treated thermal spray coating.
It has been found that when the linear expansion coefficient at 0 ° C. is equal to or smaller than that of the steel containing 9 to 20% Cr, the peeling resistance of the thermal sprayed coating can be remarkably improved.
すなわち、連続鋳造ロールは加熱→水冷の熱サイクル
を繰返し受け、特にマシーンストップ時には高温まで加
熱され、すぐに水冷される。この時に、溶射皮膜の線膨
張係数がロール表層部の線膨張係数よりも大きければ、
加熱→冷却の熱サイクルに伴う体積の膨張／収縮率は溶
射皮膜の方が大きくなり、溶射皮膜とロール表層部の境
界で溶射皮膜は剥離しやすくなる。That is, the continuous casting roll is repeatedly subjected to a heat cycle of heating → water cooling, and particularly when the machine is stopped, it is heated to a high temperature and immediately cooled with water. At this time, if the linear expansion coefficient of the thermal spray coating is larger than the linear expansion coefficient of the roll surface layer,
The thermal spray coating has a larger volume expansion / shrinkage rate due to a heat cycle from heating to cooling, and the thermal spray coating is easily peeled off at the boundary between the thermal spray coating and the roll surface layer.
一方、RT〜500℃における溶射皮膜の線膨張係数がロ
ール表層部を形成する９〜20％Cr含有鋼のそれよりも小
さいか或いは同じであれば、溶射皮膜の剥離は起こりに
くくなるのである。なお、これらの効果を得るために
は、溶射皮膜の厚さは1mm以下であることが望ましい。On the other hand, if the thermal expansion coefficient of the thermal spray coating at RT to 500 ° C. is smaller than or the same as that of the 9-20% Cr-containing steel forming the roll surface layer, peeling of the thermal spray coating hardly occurs. In order to obtain these effects, the thickness of the thermal spray coating is desirably 1 mm or less.
本発明においては、溶射方法や溶融処理方法は如何な
る方法も適用可能であるが、ロール芯部まで溶融処理温
度近傍に加熱すると母材ロール素材の強度低下や靱性の
劣化を招く恐れがあるので、高周波やガスバーナーなど
によってロール表面のみを加熱できる方法が好ましい。
また、母材ロール素材は、鋳鋼製のものや、母材に肉盛
溶接したものなど、如何なるものでも使用でき、一体型
ロールやスリーブタイプのものなど、形態も任意であ
る。In the present invention, any method can be applied to the thermal spraying method and the melting treatment method, but heating to the vicinity of the melting treatment temperature up to the roll core may cause a decrease in strength and toughness of the base material roll material, A method in which only the roll surface can be heated by high frequency or a gas burner is preferable.
The base material roll material may be any material such as a cast steel material or a build-up welded to the base material, and may have any form such as an integrated roll or a sleeve type.
次に本発明の実施例を示す。 Next, examples of the present invention will be described.
（実施例） 連続鋳造設備における引抜きロールに、本発明による
溶射ロールと従来の肉盛ロールをそれぞれ組込み、使用
時の亀裂発生度合いを調査した。(Example) The spraying roll according to the present invention and the conventional overlaying roll were each incorporated into a drawing roll in a continuous casting facility, and the degree of crack generation during use was investigated.
ロール素材としては、胴部が320φのドライブロール
であり、低合金鋼製ロールの表層部に厚さ約5mmの肉盛
溶接金属をバンドアーク溶接にて形成したものを用い
た。第１表に肉盛溶接金属の化学成分を示す。As the roll material, a drive roll having a body portion of 320φ and a low-alloy steel roll having a surface layer portion formed of a build-up weld metal having a thickness of about 5 mm by band arc welding was used. Table 1 shows the chemical components of the build-up weld metal.
溶射は、ガス溶射にて行い、溶融処理は高周波誘導加
熱を用いた。そして、溶融処理後の溶射皮膜の厚さは0.
3〜0.4mmとした。第２表に溶射粉末の化学成分を示す。Thermal spraying was performed by gas thermal spraying, and the high frequency induction heating was used for the melting process. And the thickness of the sprayed coating after the melting process is 0.
3 to 0.4 mm. Table 2 shows the chemical components of the thermal spray powder.
なお、ロールの組込み位置は、本発明による溶射ロー
ル並びに従来の肉盛ロール共に連鋳ロール群における矯
正ゾーンとした。各ロールを組込んだ後、約2000チャー
ジ使用後のロール表面の亀裂発生状態並びに亀裂の最大
深さ（クラックメーターにて計測）及び溶射皮膜の残存
状況を調査した。The roll was installed at the correction zone in the continuous casting roll group for both the thermal spray roll according to the present invention and the conventional overlay roll. After assembling each roll, the state of occurrence of cracks on the roll surface after use of about 2000 charges, the maximum depth of cracks (measured with a crack meter), and the remaining state of the thermal spray coating were examined.
第３表に調査結果を示す。 Table 3 shows the survey results.
本発明例は、約2000チャージ使用後もロール全面に溶
射皮膜が残存し、最大割れ深さが極めて浅く、良好な耐
ヒートクラック性を示した。In the example of the present invention, the sprayed coating remained on the entire surface of the roll even after using about 2000 charges, the maximum crack depth was extremely shallow, and good heat crack resistance was exhibited.
一方、比較例４に示すように、溶射粉末Ｄを溶射した
場合では最大割れが深さが大きく、比較例５の肉盛のみ
の場合とほぼ同じであり、使用早期に皮膜が剥離したこ
とを示しており、溶射皮膜の効果が殆ど得られなかっ
た。なお、比較例５は600℃で肉盛溶接後、熱処理のみ
を施したものである。On the other hand, as shown in Comparative Example 4, when the thermal spraying powder D was sprayed, the maximum crack had a large depth, which was almost the same as the case of only the overlay of Comparative Example 5, indicating that the coating was peeled off at the early stage of use. This shows that the effect of the thermal spray coating was hardly obtained. In Comparative Example 5, only the heat treatment was performed after the overlay welding at 600 ° C.
（発明の効果） 以上詳述したように、本発明によれば、耐ヒートクラ
ック性に優れた連続鋳造ロールを提供することができる
ので、ロールの使用寿命を顕著に向上でき、コスト低
減、生産性向上に寄与する効果は大きい。 (Effects of the Invention) As described in detail above, according to the present invention, a continuous casting roll excellent in heat crack resistance can be provided, so that the service life of the roll can be remarkably improved, and cost reduction and production can be achieved. The effect contributing to the improvement of the performance is great.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) C23C 4/02 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 6 , DB name) C23C 4/02
Claims (3)
％Cr含有鋼からなる母材ロールの胴部表面に、Fe:35〜6
5％、C:0.1〜2.0％、Ni:30〜40％、Cr:9〜25％、B:0.5
〜５％、Si:0.5〜５％を含むFe基自溶性合金を溶射し、
かつ該溶射皮膜を溶融処理したロールであって、該溶射
皮膜の溶融処理後のRT（室温）〜500℃における線膨張
係数がロール表層部を形成する９〜20％Cr含有鋼のRT〜
500℃における線膨張係数と同じか又は小さいことを特
徴とする耐ヒートクラック性に優れた連続鋳造ロール。(1) In weight% (hereinafter the same), the surface portion is 9 to 20%.
Fe: 35 to 6 on the body surface of a base material roll made of steel containing
5%, C: 0.1-2.0%, Ni: 30-40%, Cr: 9-25%, B: 0.5
Thermal spraying Fe-based self-fluxing alloy containing ~ 5%, Si: 0.5 ~ 5%
And a roll obtained by subjecting the sprayed coating to a melting treatment, wherein a linear expansion coefficient at 500 ° C. after the fusion treatment of the sprayed coating is from 9 to 20% of the steel containing a 20 to 20% Cr forming a roll surface layer.
A continuous casting roll excellent in heat crack resistance, having a coefficient of linear expansion equal to or smaller than that at 500 ° C.
求項１に記載のロール。2. The roll according to claim 1, wherein said base material roll is made of 13Cr-Ni steel.
接金属を内盛したロールである請求項１に記載のロー
ル。3. The roll according to claim 1, wherein the base material roll is a roll in which a 13Cr-Ni-based weld metal is buried in a surface portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24443490A JP2931384B2 (en) | 1990-09-13 | 1990-09-13 | Continuous casting roll with excellent heat crack resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24443490A JP2931384B2 (en) | 1990-09-13 | 1990-09-13 | Continuous casting roll with excellent heat crack resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04124255A JPH04124255A (en) | 1992-04-24 |
| JP2931384B2 true JP2931384B2 (en) | 1999-08-09 |
Family
ID=17118600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24443490A Expired - Fee Related JP2931384B2 (en) | 1990-09-13 | 1990-09-13 | Continuous casting roll with excellent heat crack resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2931384B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA934072B (en) | 1992-06-19 | 1994-01-19 | Commw Scient Ind Res Org | Rolls for metal shaping |
| IT1317891B1 (en) * | 2000-08-04 | 2003-07-15 | Ct Sviluppo Materiali Spa | COMPOSITION FOR HIGH RESISTANCE ELEMENTS, IN PARTICULAR INTENDED FOR HOT WEAR AND THERMAL FATIGUE, ROLLERS COATED WITH |
| US9745648B2 (en) * | 2013-06-17 | 2017-08-29 | Höganäs Ab (Publ) | Powder |
-
1990
- 1990-09-13 JP JP24443490A patent/JP2931384B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04124255A (en) | 1992-04-24 |
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