JPH03118971A - Building-up roll for continuous casting - Google Patents

Building-up roll for continuous casting

Info

Publication number
JPH03118971A
JPH03118971A JP25463889A JP25463889A JPH03118971A JP H03118971 A JPH03118971 A JP H03118971A JP 25463889 A JP25463889 A JP 25463889A JP 25463889 A JP25463889 A JP 25463889A JP H03118971 A JPH03118971 A JP H03118971A
Authority
JP
Japan
Prior art keywords
roll
weld metal
overlay
building
continuous casting
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
Application number
JP25463889A
Other languages
Japanese (ja)
Inventor
Shogo Natsume
夏目 松吾
Yasuo Murai
康生 村井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP25463889A priority Critical patent/JPH03118971A/en
Publication of JPH03118971A publication Critical patent/JPH03118971A/en
Pending legal-status Critical Current

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  • Coating By Spraying Or Casting (AREA)

Abstract

PURPOSE:To obtain a building-up roll provided with heat and cracking resistant and cracking propagation resistance by forming building-up weld metal of austenitic stainless steel having the limited thickness as an intermediate layer between the building-up weld metal and roll raw material or underlaying weld metal. CONSTITUTION:Since the building-up weld metal of the austenitic stainless steel having >=3mm thickness as the intermediate layer has excellent toughness, high-temperature strength and corrosion resistance, it has an effect to reduce the speed of cracking generated on a surface layer part to propagate to the roll raw material area. Further, the underlaying weld metal can be formed as necessary and it has an effect to maintain toughness and strength of the outer peripheral part of the roll raw material. In addition, it plays a part for restoring a shape with respect to a repairing roll. In addition, there is not special restriction as the roll row material and low alloy heat resisting steel, etc., are used for this.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、高温における繰り返し加熱、冷却下で使用さ
れる連続鋳造用ロールにおいて、優れた耐熱亀裂性、耐
亀裂進展性を有する肉盛ロールに関するものである。
Detailed Description of the Invention (Field of Industrial Application) The present invention provides an overlay roll having excellent heat crack resistance and crack growth resistance in continuous casting rolls used under repeated heating and cooling at high temperatures. It is related to.

(従来の技術及び解決しようとする課M)連続鋳造用の
引き抜きロール、ガイドロール等は、高温金属片との接
触による加熱及び水蒸気や水による冷却を繰り返し受け
、極めて苛酷な使用条件となる。このような条件下にお
いて使用するためには、高い耐熱亀裂性、耐亀裂進展性
及び耐食性を有する材料によってロールを製作する必要
がある。
(Prior Art and Issues to Be Solved) Drawing rolls, guide rolls, etc. for continuous casting are repeatedly heated by contact with high-temperature metal pieces and cooled by steam or water, resulting in extremely severe usage conditions. In order to use the roll under such conditions, it is necessary to make the roll from a material that has high heat cracking resistance, crack propagation resistance, and corrosion resistance.

このような連続鋳造用ロールとしては、従来、低合金鋼
↓こよって製作した素地ロールの外周面に。
Conventionally, such rolls for continuous casting have been made of low-alloy steel.

高合金鋼、例えば、13Cr−Ni系鋼を肉盛溶接した
ものが提案され、実用化されている。
High-alloy steels, such as 13Cr-Ni steels, made by overlay welding have been proposed and put into practical use.

しかしながら、これらの肉盛ロールにおいては、使用中
の加熱、冷却の繰り返しによる熱応力のために、ロール
表面に亀裂が発生し、深く進展するので、ロールの使用
寿命を著しく低下するという問題があり、その改善が望
まれていた。
However, in these overlay rolls, cracks occur on the roll surface due to thermal stress caused by repeated heating and cooling during use, and they propagate deeply, which significantly shortens the service life of the roll. , improvement was desired.

このように、従来の連続鋳造用肉盛ロールでは。In this way, conventional overlay rolls for continuous casting.

高温における繰り返し加熱、冷却下の使用条件に対し、
充分な耐亀裂進展性を有するものが得られていない。換
言すれば、従来の肉盛ロールは、ロール表層部の熱亀裂
発生に対しては、ある程度の性能を有する材料が肉盛さ
れているが1発生した亀裂の進展を防止或いは遅延させ
る措置が施されていないため、早期に亀裂が進展し、ロ
ールの長寿命化が図れないという状況である。
For use conditions such as repeated heating and cooling at high temperatures,
No material with sufficient crack growth resistance has been obtained. In other words, conventional overlay rolls are overlaid with materials that have a certain level of performance against the occurrence of thermal cracks on the roll surface, but measures are not taken to prevent or delay the propagation of cracks that have occurred. As a result, cracks develop early, making it impossible to extend the life of the roll.

本発明は、か)る要請に応えるべくなされたものであっ
て、特に優れた耐熱亀裂性、耐亀裂進展性を有する連続
鋳造用肉盛ロールを提供することを目的とするものであ
る。
The present invention was made in response to the above-mentioned request, and an object of the present invention is to provide an overlay roll for continuous casting that has particularly excellent heat crack resistance and crack growth resistance.

(課題を解決するための手段) 前述のように、連続鋳造用肉盛ロールの長寿命化を図る
ためには、耐熱亀裂性もさることながら、充分な耐亀裂
進展性を有する材料でロールを構成させる必要がある。
(Means for solving the problem) As mentioned above, in order to extend the life of the overlay roll for continuous casting, it is necessary to make the roll with a material that not only has heat crack resistance but also has sufficient crack propagation resistance. It needs to be configured.

本発明者等は、力いる課題を解決するため、耐熱亀裂性
及び耐亀裂進展性を兼ね備えた材料ならびにロール構造
について検討を推進した。
In order to solve the pressing problem, the present inventors have conducted studies on materials and roll structures that have both heat crack resistance and crack propagation resistance.

その結果、ロール表層部の肉盛溶接金属とロール素材又
は下盛溶接金属との間に、中間層として特定条件の肉盛
溶接金属を形成させることにより、可能であることを見
出し、ここに本発明をなしたものである。
As a result, we discovered that it is possible to achieve this by forming an overlay weld metal under specific conditions as an intermediate layer between the overlay weld metal on the roll surface and the roll material or underlay weld metal. It is an invention.

すなわち、本発明は、連続鋳造用のガイドロール、引き
抜きロール等の肉盛ロールにおいて、ロール表層部に形
成される肉盛溶接金属とロール素材若しくは下盛溶接金
属との間に、中間層として、厚さ3+++m以上のオー
ステナイト系ステンレス鋼の肉盛溶接金属を形成させた
ことを特徴とする連続鋳造用肉盛ロールを要旨とするも
のである。
That is, the present invention provides an overlay roll such as a guide roll or a drawing roll for continuous casting, as an intermediate layer between the overlay weld metal formed on the roll surface layer and the roll material or underlay weld metal. The gist of the present invention is an overlay roll for continuous casting, characterized in that overlay weld metal of austenitic stainless steel having a thickness of 3+++ m or more is formed.

以下に本発明を更に詳細に説明する。The present invention will be explained in more detail below.

(作用) 連続鋳造用肉盛ロールにおいては、ロール表層部は高温
金属片と直接接触するため、特に優れた耐熱亀裂性が要
求される。また、高温での耐食性及び耐摩耗性が要求さ
れる。
(Function) In an overlay roll for continuous casting, the surface layer of the roll comes into direct contact with a high-temperature metal piece, so particularly excellent heat cracking resistance is required. Furthermore, corrosion resistance and wear resistance at high temperatures are required.

耐熱亀裂性を支配する因子には、高温での線膨張係数、
絞り、耐力、変態点、組織などがあり、線膨張係数が小
さく、絞り、耐力が高く、変態点はないか若しくはあっ
ても加熱温度範囲よりも高いものが、優れた耐熱亀裂性
を示す傾向がある。
Factors governing thermal cracking resistance include the coefficient of linear expansion at high temperatures,
Materials with a narrowing of area, proof stress, transformation point, structure, etc., have a small coefficient of linear expansion, a high drawing stress, a high proof stress, and have no transformation point, or even if they have a transformation point, it is higher than the heating temperature range, and they tend to exhibit excellent thermal cracking resistance. There is.

また組織については、いわゆる単相の組織の方が優れて
いるとの傾向がある6 したがって、以下に示すような材料でロール表層部に肉
盛するのが好ましい。
Regarding the structure, there is a tendency that a so-called single-phase structure is better6. Therefore, it is preferable to overlay the surface layer of the roll with the following materials.

例えば、13%Cr系又は17%Cr系フェライト鋼は
線膨張係数が小さく変態点がなく、単相組織であり、耐
力については特に高いものではないが、絞りはかなり高
い値が得られることから、後述の実施例に示す如く優れ
た耐熱亀裂性を示す材料である。
For example, 13% Cr-based or 17% Cr-based ferritic steel has a small coefficient of linear expansion and no transformation point, and has a single-phase structure, and although its yield strength is not particularly high, it can obtain a considerably high value of area of area. , is a material that exhibits excellent heat cracking resistance as shown in the Examples below.

また、10〜14%Crを含有したマルテンサイj・系
鋼は、Ni含有量を2%以下に制限することにより、線
膨張係数を低い値に抑えることができ、且つ変態点を高
温度に維持することができる。
In addition, by limiting the Ni content to 2% or less, martensite steel containing 10 to 14% Cr can suppress the coefficient of linear expansion to a low value and maintain the transformation point at a high temperature. can do.

しかし、組織をマルテンサイト単相にするためには、N
iを0.5%以上添加する必要がある。Crを10〜1
4%の範囲に制限するのは、Crが10%未満になると
、線膨張係数の上昇による耐熱亀裂性の劣化を来たすこ
と、及び耐食性が大きく劣化するためであり、また、C
rが14%を超えると、溶接性を維持した状態でフェラ
イトの生成を抑えることができなくなるためである。
However, in order to make the structure a martensite single phase, N
It is necessary to add 0.5% or more of i. 10 to 1 Cr
The reason why the content of Cr is limited to 4% is that if the content of Cr is less than 10%, the thermal cracking resistance will deteriorate due to an increase in the coefficient of linear expansion, and the corrosion resistance will be significantly deteriorated.
This is because if r exceeds 14%, it becomes impossible to suppress the formation of ferrite while maintaining weldability.

更に、好ましくは高温での耐力を上昇させるため1Mo
、Nb、Vといった炭化物形成元素を組織的にフェライ
トが析出しない範囲で添加することが有利である。
Furthermore, preferably 1Mo to increase yield strength at high temperatures.
It is advantageous to add carbide-forming elements such as , Nb, and V to the extent that ferrite does not precipitate structurally.

このようなマルテンサイト系鋼も、前記フェライト系鋼
と同様、優れた耐熱亀裂性を示すものである。したがっ
て、ロール表層部には、前記フェライト系或いはマルテ
ンサイト系の溶接金属を肉盛により形成させることが好
ましい。
Such martensitic steel also exhibits excellent heat cracking resistance like the ferritic steel. Therefore, it is preferable to form the ferritic or martensitic weld metal on the roll surface layer by overlaying.

しかしながら、このような溶接金属をロール素材或いは
低合金鋼等の下盛溶接金属上に形成させるだけでは、ロ
ールの大幅な長寿命化を図ることがむずかしい。
However, it is difficult to significantly extend the life of the roll simply by forming such weld metal on the roll material or the underlay weld metal such as low alloy steel.

すなわち、優れた耐熱亀裂性を有する表層材を用いた場
合でも、亀裂が全く発生しないのではなく、厳しい使用
環境において、発生形態、時期の差こそあれ、亀裂は発
生するのである。この亀裂深さが数mff1程度の比較
的浅い時点までは、割れ発生速度、深さは表層材の耐熱
亀裂性に依存すると考えられるが、これより深い割れ深
さになると、割れという切欠が存在した状態での疲労特
性が亀裂の進展に大きく影響を及ぼすことになる。この
場合は耐熱亀裂性に対しては、あまり影響を及ぼさない
靭性が重要な因子の1つとなるが、前記フェライト基或
いはフルテンサイl−系では、高靭性の溶接金属を得る
ことが困難である。この点、マルテンサイト系において
Ni量を多く添加すれば、靭性はかなり改善されるが、
反面、線膨張係数の増大により耐亀裂性が劣化する。
In other words, even when a surface material with excellent heat crack resistance is used, cracks do not occur at all, but cracks do occur in harsh usage environments, although the form and timing of the occurrence may vary. Until the crack depth is relatively shallow, about several mff1, the crack initiation rate and depth are considered to depend on the heat cracking resistance of the surface material, but when the crack depth becomes deeper than this, a notch called a crack exists. The fatigue properties under such conditions will have a large effect on crack propagation. In this case, toughness is one of the important factors that does not have much influence on heat cracking resistance, but it is difficult to obtain a high-toughness weld metal with the ferrite-based or full-tensile l-based weld metal. In this regard, if a large amount of Ni is added in martensitic systems, the toughness can be improved considerably, but
On the other hand, crack resistance deteriorates due to an increase in linear expansion coefficient.

このような背景をもとに、本発明者等が種々試作、研究
した結果、中間層として、オーステナイト系ステンレス
鋼を形成することが最もロール寿命の延長に有効である
ことを見い出した。
Based on this background, the inventors of the present invention made various prototypes and conducted research, and as a result, they found that forming an austenitic stainless steel as the intermediate layer is most effective in extending the life of the roll.

すなわち、オーステナイト系ステンレス鋼の溶接金属は
、特に優れた靭性を有していること、高温強度が高いこ
と、優れた耐食性を有していることから、表層部で発生
した亀裂がロール素材域へ進展する速度を低下させるの
に効果を発揮することが、後述の実施例に示す如く確認
された。なお、この中間層の厚さについては、厚い方が
有利と云えるが、ロールコストとの関連もあり、少なく
とも3mmが必要であり、5〜10mo+程度の厚さが
適当である。
In other words, austenitic stainless steel weld metal has particularly excellent toughness, high high-temperature strength, and excellent corrosion resistance, so cracks that occur in the surface layer can easily penetrate into the roll material area. It was confirmed that it is effective in reducing the rate of progress, as shown in the Examples below. Regarding the thickness of this intermediate layer, although it can be said that a thicker one is advantageous, it is also related to the roll cost, and therefore at least 3 mm is required, and a thickness of about 5 to 10 mo+ is appropriate.

なお、下盛溶接金属は必要に応じて形成すればよく、低
合金鋼などを用いる。これにより、ロー・ル素材外周部
の靭性、強度確保に効果があり、補修ロールに対しては
形状復元用としての役割も果たす。
Note that the underlay weld metal may be formed as necessary, and low alloy steel or the like is used. This is effective in ensuring the toughness and strength of the outer periphery of the roll material, and also plays a role in restoring the shape of the repair roll.

また、ロール素材としては、特に制限はなく、低合金耐
熱鋼などを用いる。
Further, there is no particular restriction on the roll material, and low alloy heat resistant steel or the like is used.

次に本発明の詳細な説明する。Next, the present invention will be explained in detail.

(実施例) 連続鋳造設備における引き抜きロールとして、第1表に
示す構成の肉盛ロールを製作し、組み込み、使用時の亀
裂発生及び進展度合について調査した。
(Example) Overlay rolls having the configuration shown in Table 1 were manufactured as drawing rolls in continuous casting equipment, and the occurrence and extent of cracking during use was investigated.

なお、組込みロールは、胴部が380+uaφのドライ
ブロールであり、ロール素材は低合金耐熱鋼からなって
いる。
The built-in roll is a drive roll with a body of 380+uaφ, and the roll material is made of low-alloy heat-resistant steel.

肉盛溶接は、いずれもバンドアーク溶接法により施工し
、肉盛ロールの組込み位置は連鋳ロール群における矯正
ゾーンとした。
All overlay welding was performed by band arc welding, and the overlay roll was installed in the straightening zone of the continuous casting roll group.

それぞれの肉盛ロールを組込んだ後、使用時の亀裂の最
大深さをクラックメーターで計測し、進展状況を調査し
た。
After each overlay roll was installed, the maximum depth of cracks during use was measured using a crack meter, and the progress of the cracks was investigated.

以上の試験結果を第1図に示す。第1図は各肉盛ロール
における使用チャージ数と亀裂最大深さの関係を示して
いる。
The above test results are shown in Figure 1. FIG. 1 shows the relationship between the number of charges used in each overlay roll and the maximum crack depth.

第1図より、比較例の肉感ロールは早期に浅い亀裂が発
生し、その後、使用チャージ数の増加に伴い急激に亀裂
深さが大きくなるのに対し1本発明例の肉盛ロールは、
中間層相当部の深さにおいて亀裂進展速度が低下してい
る。特に、表層材として13Cr系マルテンサイト鋼を
肉盛した本発明例の肉感ロール(B)は、初期の亀裂発
生深さが浅いことも相まって、最終調査チャージ数にお
ける亀裂深さもかなり浅くなることが確認された。
From FIG. 1, it can be seen that shallow cracks occur early on in the textured roll of the comparative example, and then the crack depth rapidly increases as the number of charges used increases, whereas in the cladding roll of the example of the present invention,
The crack growth rate decreases at the depth corresponding to the intermediate layer. In particular, in the fleshy roll (B) of the present invention example in which 13Cr-based martensitic steel is overlaid as the surface layer material, the initial crack initiation depth is shallow, and the crack depth at the final investigated charge number is also quite shallow. confirmed.

【以下余白1 (発明の効果) 以上詳述したように、本発明によれば、連続鋳造用ロー
ルに必要な耐熱亀裂性及び耐亀裂進展性を備えた肉盛ロ
ールを提供することができ、ひいてはロール寿命の延長
化に伴う操業コストの低減に大きく寄与することができ
る。
[Margin 1 (Effects of the Invention) As detailed above, according to the present invention, it is possible to provide an overlay roll having heat crack resistance and crack propagation resistance necessary for a roll for continuous casting, In turn, it can greatly contribute to the reduction of operating costs due to the extension of roll life.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は実施例で得られた各肉盛ロールにおける使用チ
ャージ数と亀裂最大深さの関係を示す図である。
FIG. 1 is a diagram showing the relationship between the number of charges used and the maximum crack depth in each overlay roll obtained in Examples.

Claims (3)

【特許請求の範囲】[Claims] (1)連続鋳造用のガイドロール、引き抜きロール等の
肉盛ロールにおいて、ロール表層部に形成される肉盛溶
接金属とロール素材若しくは下盛溶接金属との間に、中
間層として、厚さ3mm以上のオーステナイト系ステン
レス鋼の肉盛溶接金属を形成させたことを特徴とする連
続鋳造用肉盛ロール。
(1) In overlay rolls such as guide rolls and drawing rolls for continuous casting, an intermediate layer with a thickness of 3 mm is placed between the overlay weld metal formed on the roll surface layer and the roll material or underlay weld metal. An overlay roll for continuous casting, characterized in that the overlay weld metal of the austenitic stainless steel described above is formed.
(2)ロール表層部に形成される肉盛溶接金属が、13
%Cr系又は17%Cr系フェライト鋼である請求項1
に記載の連続鋳造用肉盛ロール。
(2) The overlay weld metal formed on the roll surface layer is 13
Claim 1 which is %Cr-based or 17%Cr-based ferritic steel.
Overlay roll for continuous casting described in .
(3)ロール表層部に形成される肉盛溶接金属が、10
〜14wt%の範囲でCrを含有したマルテンサイト系
鋼である請求項1に記載の連続鋳造用肉盛ロール。
(3) The overlay weld metal formed on the roll surface layer is 10
The overlay roll for continuous casting according to claim 1, which is a martensitic steel containing Cr in a range of 14 wt%.
JP25463889A 1989-09-29 1989-09-29 Building-up roll for continuous casting Pending JPH03118971A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25463889A JPH03118971A (en) 1989-09-29 1989-09-29 Building-up roll for continuous casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25463889A JPH03118971A (en) 1989-09-29 1989-09-29 Building-up roll for continuous casting

Publications (1)

Publication Number Publication Date
JPH03118971A true JPH03118971A (en) 1991-05-21

Family

ID=17267799

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25463889A Pending JPH03118971A (en) 1989-09-29 1989-09-29 Building-up roll for continuous casting

Country Status (1)

Country Link
JP (1) JPH03118971A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011050994A (en) * 2009-09-03 2011-03-17 Nippon Steel Corp Cast slab holding roll of continuous casting machine
CN102717225A (en) * 2012-06-05 2012-10-10 新疆众和股份有限公司 Method for repairing damage of non-work surface of roller

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011050994A (en) * 2009-09-03 2011-03-17 Nippon Steel Corp Cast slab holding roll of continuous casting machine
CN102717225A (en) * 2012-06-05 2012-10-10 新疆众和股份有限公司 Method for repairing damage of non-work surface of roller
CN102717225B (en) * 2012-06-05 2015-05-20 新疆众和股份有限公司 Method for repairing damage of non-work surface of roller

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