JPH10314938A - Overlaid roll by welding and its manufacture - Google Patents
Overlaid roll by welding and its manufactureInfo
- Publication number
- JPH10314938A JPH10314938A JP12272997A JP12272997A JPH10314938A JP H10314938 A JPH10314938 A JP H10314938A JP 12272997 A JP12272997 A JP 12272997A JP 12272997 A JP12272997 A JP 12272997A JP H10314938 A JPH10314938 A JP H10314938A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- layer
- build
- welding
- 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.)
- Pending
Links
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Coating By Spraying Or Casting (AREA)
- Heat Treatment Of Articles (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ツインロール型薄
板連続鋳造用モールドロールや連続鋳造装置のモールド
直下のフートロール、熱間圧延用ロールなど高温に晒さ
れる箇所に使用され、その表面に耐熱合金が肉盛された
肉盛ロールに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a portion exposed to high temperatures, such as a twin roll type continuous casting mold roll, a foot roll immediately below a mold of a continuous casting apparatus, a hot rolling roll, and has a heat resistant alloy on its surface. Relates to a build-up roll on which the build-up is performed.
【０００２】[0002]
【従来の技術】従来、高温に晒される連続鋳造に使用さ
れるモールドロールには、その表面に基Ｎｉ耐熱合金を
肉盛溶接した後、機械加工により所定寸法に形成された
ものがある。2. Description of the Related Art Conventionally, as a mold roll used for continuous casting exposed to high temperatures, there is a roll formed by welding a base Ni heat-resistant alloy to the surface thereof and then forming the same to a predetermined size by machining.
【０００３】[0003]
【発明が解決しようとする課題】しかし、苛酷な熱疲労
が発生する使用環境において、特にツインロール型薄板
連続鋳造用モールドロールの場合、モールドロール内部
は水冷され、モールドロール表面は、高温の溶湯と接す
るため、長時間使用した場合、小さい熱疲労亀裂が発生
してこれが大きい亀裂に伸展する。この亀裂が深い場合
には、その肉盛外周部を再研削せざるを得ない状態にな
り、このため肉盛厚みが減少してロールの寿命が短くな
るという問題があった。However, in a use environment in which severe thermal fatigue occurs, especially in the case of a twin-roll type continuous casting mold roll, the inside of the mold roll is water-cooled, and the surface of the mold roll is heated at a high temperature. Therefore, when used for a long time, small thermal fatigue cracks are generated and these cracks are extended to large cracks. When the crack is deep, the outer peripheral portion of the overlay has to be re-ground, so that there is a problem that the thickness of the overlay is reduced and the life of the roll is shortened.
【０００４】本発明のうち請求項１記載の発明は、上記
問題点を解決して、熱疲労亀裂の発生も少なく、長時間
の使用に耐えられる肉盛ロールおよびその製造方法を提
供することを目的とする。The first aspect of the present invention solves the above-mentioned problems and provides a build-up roll which is less likely to cause thermal fatigue cracks and which can be used for a long time, and a method of manufacturing the same. Aim.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に本発明の請求項１記載の肉盛ロールは、ロール母材の
外周面に溶接肉盛された肉盛層が形成された肉盛ロール
において、肉盛層の表層側に、肉盛層が再溶融処理され
た再溶融層部を形成したものである。According to a first aspect of the present invention, there is provided a build-up roll, wherein a welded build-up layer is formed on an outer peripheral surface of a roll base material. In the roll, on the surface side of the build-up layer, a re-melted layer portion in which the build-up layer is re-melted is formed.
【０００６】また請求項２記載の発明は、ロール母材が
ステンレス鋼であり、肉盛材料がＮｉ基合金としたもの
である。さらに請求項３記載の肉盛ロールの製造方法
は、ロール母材の外周面に、アーク式粉体肉盛溶接によ
り所定厚さの肉盛層を形成し、次にこの肉盛層の表層側
をアーク熱により再溶融して再溶融層部を形成し、再溶
融層部の凝固後、ロール外周面を所定寸法に機械加工す
るものである。According to a second aspect of the present invention, the roll base material is stainless steel, and the overlay material is a Ni-based alloy. Further, in the method for manufacturing a build-up roll according to claim 3, a build-up layer having a predetermined thickness is formed on the outer peripheral surface of the roll base material by arc type powder build-up welding, and then the surface side of the build-up layer is formed. Is remelted by arc heat to form a remelted layer portion, and after solidification of the remelted layer portion, the outer peripheral surface of the roll is machined to a predetermined size.
【０００７】上記構成によれば、肉盛層を再溶融するこ
とにより、肉盛層の表層側でビード境界部がない均質化
された再溶融層を形成することができる。したがって、
ロールの表面にビード境界部に起因する熱疲労による亀
裂の発生を防止することができ、耐熱性に優れかつ長寿
命のロールを提供することができる。[0007] According to the above configuration, by re-melting the build-up layer, it is possible to form a homogenized re-melt layer having no bead boundary on the surface side of the build-up layer. Therefore,
It is possible to prevent the occurrence of cracks on the roll surface due to thermal fatigue caused by the bead boundary, and to provide a roll having excellent heat resistance and a long life.
【０００８】[0008]
【発明の実施の形態】ここで、本発明に係る薄板連続鋳
造設備のモールドロールの実施の形態を図１〜図８に基
づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an embodiment of a mold roll of a continuous sheet casting facility according to the present invention will be described with reference to FIGS.
【０００９】図１，図２に示すように、このモールドロ
ール１は、たとえば直径Ｄ＝２．０ｍ、幅Ｗ＝１．５ｍ
の円柱形状で、母材２にステンレス鋼が使用され、母材
２の外周面にＮｉ基合金粉体材料からなる肉盛溶接によ
り肉盛層３が形成されている。そしてこの肉盛層３の表
層側には、肉盛後に再溶融された再溶融層部３ａが形成
されている。As shown in FIGS. 1 and 2, this mold roll 1 has a diameter D = 2.0 m and a width W = 1.5 m, for example.
The base material 2 is made of stainless steel, and a build-up layer 3 is formed on the outer peripheral surface of the base material 2 by build-up welding made of a Ni-based alloy powder material. A re-melted layer portion 3a that is re-melted after the build-up is formed on the surface side of the build-up layer 3.
【００１０】このモールドロール１の製造方法は、先ず
ロール母材２を軸心周りに回転自在に配置し、ロール母
材２とトーチとの間にアークを形成するとともに、トー
チから肉盛材料である耐熱Ｎｉ基合金粉末を供給し、ロ
ール母材２を回転させつつトーチを幅方向に移動して外
周面全面にわたって肉盛を複数層形成し、所定厚さの肉
盛層３を形成する。ついでトーチと肉盛層３との間にア
ークを形成し、アーク熱により肉盛層３の表層側を全深
さの約半分程度再溶融して再溶融層部３ａを形成する。
そして、再溶融層部３ａの凝固後、ロールの外周面を所
定寸法に機械研削する。The method of manufacturing the mold roll 1 is as follows. First, a roll base material 2 is rotatably arranged around an axis, an arc is formed between the roll base material 2 and a torch, and a build-up material is formed from the torch. A certain heat-resistant Ni-based alloy powder is supplied, and the torch is moved in the width direction while rotating the roll base material 2 to form a plurality of overlays over the entire outer peripheral surface, thereby forming the overlay 3 having a predetermined thickness. Next, an arc is formed between the torch and the build-up layer 3, and the surface layer side of the build-up layer 3 is re-melted about half of the entire depth by the arc heat to form a re-melted layer portion 3a.
After the solidification of the remelted layer portion 3a, the outer peripheral surface of the roll is mechanically ground to a predetermined size.
【００１１】ここで使用されるロール母材２はステンレ
ス鋼であり、耐熱Ｎｉ基合金の成分は、図３の通りであ
る。次に、単に肉盛層３のみの従来ロールと、肉盛層３
に再溶融層３ａを形成した本発明ロールとを比較した実
験結果を説明する。なお各ロールは内部から水冷され
る。The roll base material 2 used here is stainless steel, and the components of the heat-resistant Ni-based alloy are as shown in FIG. Next, the conventional roll having only the overlay 3 and the overlay 3
An experimental result comparing the present invention roll with the remelted layer 3a formed thereon will be described. Each roll is water-cooled from the inside.
【００１２】肉盛層３のみの従来ロールは、図４に示す
Ｘ線解析による元素分析試験では、肉盛層３の表面でビ
ードの境界部にやや高いＮｉ元素の偏在が認められ、ま
た図６に示す硬さ分布試験では、ビードの境界部に平均
硬さより高い硬さの上昇が認められた。さらに従来ロー
ルの使用実験では、図８に示すようにロール使用時間と
熱疲労亀裂深さの関係が明らかにされ、使用２０分後か
ら僅かな亀裂の発生が見られ、使用時間の経過とともに
亀裂が拡張される実態が明らかになった。したがって、
従来ロールでは、ビードの境界部が熱疲労環境下で亀裂
を発生しやすくなっていると考えられる。In the conventional roll having only the build-up layer 3, in the elemental analysis test by the X-ray analysis shown in FIG. 4, a rather high uneven distribution of the Ni element was found at the bead boundary on the surface of the build-up layer 3. In the hardness distribution test shown in No. 6, an increase in hardness higher than the average hardness was observed at the bead boundary. Further, in the use experiment of the conventional roll, as shown in FIG. 8, the relationship between the roll use time and the thermal fatigue crack depth was clarified, and a slight crack was observed from 20 minutes after use, and the crack was observed as the use time elapsed. The fact that it is expanded became clear. Therefore,
In the conventional roll, it is considered that the boundary portion of the bead is liable to crack in a thermal fatigue environment.
【００１３】しかしながら、再溶融層３ａを形成した本
発明ロールは、図５に示すＸ線解析による元素分析試験
では、ビードの境界部にＮｉ元素の偏在が認められられ
ず、また図７に示す硬さ分布試験でも、ビードの境界部
は平均硬さと同じで特に硬さの上昇が認められなかっ
た。さらに本発明ロールは、ロール使用実験では、図８
に示すように熱疲労亀裂の発生は認められず、使用時間
の経過により発生する亀裂も極めて小さいことが分かっ
た。However, in the roll of the present invention on which the remelted layer 3a is formed, in the elemental analysis test by the X-ray analysis shown in FIG. 5, no uneven distribution of Ni element is recognized at the boundary of the bead. In the hardness distribution test, the boundary portion of the bead was the same as the average hardness, and no particular increase in hardness was observed. Further, in the roll use experiment, the roll of the present invention is shown in FIG.
No thermal fatigue cracking was observed as shown in Fig. 5, and it was found that the cracks generated with the elapse of use time were extremely small.
【００１４】なお、図８に示すロール使用実験では、亀
裂の最大幅を測定し、予め多数のデータから得られた亀
裂の最大幅と深さの関係に基づいて、亀裂の最大幅から
亀裂の深さを推定した。ここで使用される溶鋼はＳＵＳ
３０４のステンレス溶鋼であり、一対のモールドロール
により１０分間に１０ｔの溶鋼を薄板に連続鋳造したも
のである。In the roll use experiment shown in FIG. 8, the maximum width of the crack was measured, and the maximum width of the crack was determined from the maximum width of the crack based on the relationship between the maximum width of the crack and the depth obtained from a large number of data in advance. The depth was estimated. The molten steel used here is SUS
304 stainless steel molten steel is obtained by continuously casting 10 t of molten steel into a thin plate for 10 minutes by a pair of mold rolls.
【００１５】上記実施の形態によれば、再溶融層３ａを
形成することにより、元素偏在および硬さ上昇など性質
偏在のあるビードの境界部を無くして均質化することが
でき、その結果、熱疲労亀裂の発生を効果的に抑制する
ことができて、長時間の使用にも耐える長寿命のモール
ドロール１を提供することができる。According to the above-described embodiment, by forming the re-melted layer 3a, it is possible to eliminate the boundaries of beads having uneven distribution of properties such as uneven distribution of elements and increase in hardness, and to homogenize the beads. It is possible to provide a long-life mold roll 1 that can effectively suppress the occurrence of fatigue cracks and withstand long-term use.
【００１６】[0016]
【発明の効果】以上に述べたごとく本発明の請求項１記
載の発明によれば、肉盛層を再溶融することにより、肉
盛層の表層側でビード境界部を無い均質化された再溶融
層を形成することができる。したがって、ロールの表面
にビード境界部に起因する熱疲労による亀裂の発生を防
止することができ、耐熱性に優れかつ長寿命のロールを
提供することができる。As described above, according to the first aspect of the present invention, by re-melting the build-up layer, a homogenized re-form having no bead boundary on the surface side of the build-up layer is obtained. A molten layer can be formed. Therefore, it is possible to prevent the occurrence of cracks on the roll surface due to the thermal fatigue caused by the bead boundary, and to provide a roll having excellent heat resistance and a long life.
【図１】本発明に係るモールドロールの実施の形態を示
し、溶融層の拡大断面図である。FIG. 1 shows an embodiment of a mold roll according to the present invention and is an enlarged sectional view of a molten layer.
【図２】（ａ），（ｂ）はモールドロールの全体を示
し、（ａ）は側面図、（ｂ）は正面図である。FIGS. 2A and 2B show the entirety of a mold roll, wherein FIG. 2A is a side view and FIG. 2B is a front view.
【図３】同モールドロールに使用した肉盛材料成分を示
す図表である。FIG. 3 is a table showing components of a build-up material used for the mold roll.
【図４】（ａ），（ｂ）は同モールドロールと比較する
ための従来ロールの肉盛層元素分析結果を示し、（ａ）
は分析グラフ、（ｂ）は分析結果の最大値、最低値を示
す図表である。4 (a) and 4 (b) show the results of elemental analysis of a build-up layer of a conventional roll for comparison with the same mold roll, and FIG.
Is an analysis graph, and (b) is a chart showing the maximum and minimum values of the analysis results.
【図５】（ａ），（ｂ）は同モールドロールの肉盛層元
素分析結果を示し、（ａ）は分析グラフ、（ｂ）は分析
結果の最大値、最低値を示す図表である。5 (a) and 5 (b) show the results of elemental analysis of the buildup layer of the same mold roll, FIG. 5 (a) is an analysis graph, and FIG. 5 (b) is a chart showing the maximum and minimum values of the analysis results.
【図６】同モールドロールと比較するための従来ロール
の肉盛層硬さ分布を示すグラフである。FIG. 6 is a graph showing a build-up layer hardness distribution of a conventional roll for comparison with the same mold roll.
【図７】同モールドロールの肉盛層硬さ分布を示すグラ
フである。FIG. 7 is a graph showing a build-up layer hardness distribution of the mold roll.
【図８】同モールドロールの使用実験による使用時間と
熱疲労亀裂の発生の関係を示す図表である。FIG. 8 is a chart showing the relationship between the use time and the occurrence of thermal fatigue cracks in a use experiment of the same mold roll.
１ モールドロール ２ ロール母材 ３ 肉盛層 ３ａ 再溶融層部 DESCRIPTION OF SYMBOLS 1 Mold roll 2 Roll base material 3 Overlay layer 3a Remelted layer part
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ２１Ｄ 9/38 Ｃ２１Ｄ 9/38 Ｚ Ｃ２３Ｃ 4/18 Ｃ２３Ｃ 4/18 // Ｂ２１Ｂ 27/00 Ｂ２１Ｂ 27/00 Ｂ Ｂ２２Ｄ 11/06 ３３０ Ｂ２２Ｄ 11/06 ３３０Ｂ 11/128 ３４０ 11/128 ３４０Ｚ Ｃ２２Ｆ 1/00 ６１４ Ｃ２２Ｆ 1/00 ６１４ 1/10 1/10 Ｋ Ｃ２３Ｃ 26/00 Ｃ２３Ｃ 26/00 Ｅ ────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. 6 Identification code FI C21D 9/38 C21D 9/38 Z C23C 4/18 C23C 4/18 // B21B 27/00 B21B 27/00 B B22D 11/06 330 B22D 11/06 330B 11/128 340 11/128 340Z C22F 1/00 614 C22F 1/00 614 1/10 1/10 K C23C 26/00 C23C 26/00 E
Claims (3)
層が形成された肉盛ロールにおいて、肉盛層の表層側
に、肉盛層が再溶融処理された再溶融層部を形成したこ
とを特徴とする肉盛ロール。1. A re-melting layer in which a build-up layer formed by welding on the outer peripheral surface of a roll base material is formed on a surface side of the build-up layer. A build-up roll, characterized by forming
料がＮｉ基合金としたことを特徴とする請求項１記載の
肉盛ロール。2. The cladding roll according to claim 1, wherein the roll base material is stainless steel, and the cladding material is a Ni-based alloy.
溶接により所定厚さの肉盛層を形成し、次にこの肉盛層
の表層側をアーク熱により再溶融して再溶融層部を形成
し、再溶融層部の凝固後、ロール外周面を所定寸法に機
械加工することを特徴とする肉盛ロールの製造方法。3. A build-up layer having a predetermined thickness is formed on the outer peripheral surface of the roll base material by arc type powder build-up welding, and then the surface side of the build-up layer is re-melted by arc heat and re-formed. A method for producing a build-up roll, comprising forming a molten layer portion, solidifying the re-melted layer portion, and then machining the outer peripheral surface of the roll to a predetermined size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12272997A JPH10314938A (en) | 1997-05-14 | 1997-05-14 | Overlaid roll by welding and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12272997A JPH10314938A (en) | 1997-05-14 | 1997-05-14 | Overlaid roll by welding and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10314938A true JPH10314938A (en) | 1998-12-02 |
Family
ID=14843148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12272997A Pending JPH10314938A (en) | 1997-05-14 | 1997-05-14 | Overlaid roll by welding and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10314938A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006231405A (en) * | 2005-01-31 | 2006-09-07 | Mitsui Eng & Shipbuild Co Ltd | High-temperature corrosion resistant metallic member, method for producing high-temperature corrosion resistant metallic member, and high-temperature corrosion resistant alloy |
| EP2428301A1 (en) | 2008-04-22 | 2012-03-14 | Siemens VAI Metals Technologies GmbH | Roller for supporting and transporting hot goods with a clad welding layer ; Welding material for use in building-up welding on a surface of a workpiece |
| JP2020020019A (en) * | 2018-08-03 | 2020-02-06 | 日本製鉄株式会社 | Tuyere for blast furnace and manufacturing method thereof |
-
1997
- 1997-05-14 JP JP12272997A patent/JPH10314938A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006231405A (en) * | 2005-01-31 | 2006-09-07 | Mitsui Eng & Shipbuild Co Ltd | High-temperature corrosion resistant metallic member, method for producing high-temperature corrosion resistant metallic member, and high-temperature corrosion resistant alloy |
| EP2428301A1 (en) | 2008-04-22 | 2012-03-14 | Siemens VAI Metals Technologies GmbH | Roller for supporting and transporting hot goods with a clad welding layer ; Welding material for use in building-up welding on a surface of a workpiece |
| US8845501B2 (en) | 2008-04-22 | 2014-09-30 | Siemens Vai Metals Technologies Gmbh | Process for producing a roll for supporting and conveying hot material, process for repairing a worn roll |
| JP2020020019A (en) * | 2018-08-03 | 2020-02-06 | 日本製鉄株式会社 | Tuyere for blast furnace and manufacturing method thereof |
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