JPH11158669A - Thermal-spray-coated roll for continuous acid pickling line - Google Patents
Thermal-spray-coated roll for continuous acid pickling lineInfo
- Publication number
- JPH11158669A JPH11158669A JP33260597A JP33260597A JPH11158669A JP H11158669 A JPH11158669 A JP H11158669A JP 33260597 A JP33260597 A JP 33260597A JP 33260597 A JP33260597 A JP 33260597A JP H11158669 A JPH11158669 A JP H11158669A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- carbide
- dispersed
- tungsten carbide
- steel plate
- 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.)
- Granted
Links
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、熱間圧延後、鋼板
表面に生成したスケールを酸洗除去する酸洗において鋼
板の搬送及び保持並びに曲げ加工に用いる鋼板の巻き付
き角度が６０度以下のロール、然も表層に溶射膜を付与
したロールに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll having a steel sheet winding angle of 60 degrees or less, which is used for carrying and holding and bending a steel sheet in pickling for removing scale formed on the steel sheet surface after hot rolling. Of course, the present invention relates to a roll having a sprayed film provided on a surface layer.
【０００２】[0002]
【従来の技術】従来、連続酸洗ライン用ロールはロール
直径が３００ｍｍ以上の場合はＪＩＳ５５０２の球状黒
鉛鋳鉄品（ＦＣＤ）が使用されロール直径が３００ｍｍ
以下の場合はＪＩＳ４８０５の高炭素クロム軸受鋼鋼材
が使用されていた。又、高クロム合金を溶接にて肉盛る
方式も従来から一般的に行われていた。又、実開平３−
３６３０２号公報に開示された炭化タングステン（Ｗ
Ｃ）５０〜８０パーセント、Ｃｒ１５〜３５パーセン
ト、Ｎｉ５〜１５パーセントとした超硬材質を溶射にて
被覆する方式も一部に行われている。2. Description of the Related Art Conventionally, when a roll for a continuous pickling line has a roll diameter of 300 mm or more, JIS 5502 spheroidal graphite cast iron (FCD) is used and the roll diameter is 300 mm.
In the following cases, JIS 4805 high carbon chromium bearing steel was used. Conventionally, a method of overlaying a high chromium alloy by welding has been generally used. In addition, 3-
No. 36302 discloses a tungsten carbide (W
C) A method of coating a super hard material of 50 to 80%, Cr 15 to 35%, and Ni 5 to 15% by thermal spraying is also partially performed.
【０００３】[0003]
【発明が解決しようとする課題】連続酸洗ライン用ロー
ルは熱間圧延後の板厚みが２〜９ｍｍの鋼板に接して回
転しているが板のエッジ部分の接触により摩耗が早期に
進展し、従来のＪＩＳ５５０２の球状黒鉛鋳鉄品（ＦＣ
Ｄ）及びＪＩＳ４８０５の高炭素クロム軸受鋼鋼材の場
合、ロールのビッカース硬度がＨｖ４００からＨｖ５０
０でこれらの材質を使用した場合、早期に表面が摩耗し
て１ヵ月から１．５ヵ月でロール交換を実施する必要が
あった。The rolls for the continuous pickling line rotate while being in contact with a steel plate having a thickness of 2 to 9 mm after hot rolling. The conventional JIS5502 spheroidal graphite cast iron product (FC
In the case of D) and JIS 4805 high carbon chromium bearing steel, the Vickers hardness of the roll is from Hv400 to Hv50.
When these materials were used at 0, the surface was worn out at an early stage, and it was necessary to carry out a roll change in 1 to 1.5 months.
【０００４】一方、ロールの耐摩耗性を向上させるため
に高クロム合金を溶接にて肉盛る方式が行われているが
この方法では溶融時にクロムが鉄マトリックスに固溶し
て、マトリックス全体が硬化し、延性が低下するため衝
撃に対する耐久性が低下して、ロールの転動による疲労
が原因で表面層に微小な亀裂が生じ、剥離を繰り返すこ
とにより減耗が進み、寿命は使用条件によりバラツキが
有るものの３から６ヵ月程度であった。On the other hand, in order to improve the abrasion resistance of the roll, a method of welding a high chromium alloy by welding has been used. However, in this method, chromium forms a solid solution in an iron matrix at the time of melting, and the entire matrix hardens. However, due to reduced ductility, durability against impact is reduced, and fine cracks are generated in the surface layer due to fatigue due to rolling of the roll, and wear is promoted by repeated peeling, and the life varies depending on use conditions. However, it took about 3 to 6 months.
【０００５】又、実開平３−３６３０２号公報に開示さ
れた炭化タングステン（ＷＣ）５０〜８０パーセント、
Ｃｒ１５〜３５パーセント、Ｎｉ ５〜１５パーセント
とした超硬材質を溶射にて被覆する方式では鋼板がロー
ルに９０度以上巻き付いて鋼板との接触面圧が小さいブ
ライドルロールには適用可能である。しかし巻き付き角
度が６０度以下で接触面圧の大きいロール、つまりフレ
ックスロール及びレベリングロールでは使用出来ないと
言う問題があった。その原因は皮膜自身の延性が過度に
不足しているためであった。そのため巻き付き角度が６
０度以下の鋼板の接触面圧が高いロールに適用可能な溶
射ロールが切望されていた。Also, tungsten carbide (WC) 50-80% disclosed in Japanese Utility Model Laid-Open Publication No. 3-36302,
The method in which a super hard material having Cr of 15 to 35% and Ni of 5 to 15% is coated by thermal spraying can be applied to a bridle roll in which a steel sheet is wound around a roll by 90 degrees or more and a contact pressure with the steel sheet is small. However, there is a problem that a roll having a wrapping angle of 60 degrees or less and a large contact surface pressure, that is, a flex roll and a leveling roll cannot be used. The cause was that the ductility of the film itself was excessively insufficient. Therefore, the winding angle is 6
A thermal spray roll applicable to a roll having a high contact surface pressure of a steel sheet having a temperature of 0 ° or less has been desired.
【０００６】[0006]
【課題を解決するための手段】上述した課題に対し解決
したものであって、その発明の要旨とするところは、 （１）熱間圧延後、鋼板表面に生成したスケールを酸洗
除去する酸洗に使用する鋼板の巻き角度が６０度以下の
ロールにおいて、炭化物が金属マトリックス中に分散す
る形の組構造を有する溶射皮膜を表層被覆する。 （２）前記（１）において添加する炭化物を炭化タング
ステン（ＷＣ）とする。 （３）前記（２）において添加する炭化タングステン
（ＷＣ）の組成比率が重量パーセントで１０〜４０パー
セントとするか、又は顕微鏡による組織拡大写真におい
て炭化タグステン（ＷＣ）の占める面積割合が７〜２８
パーセントになるようにする。Means for Solving the Problems To solve the above-mentioned problems, the gist of the present invention is as follows: (1) An acid for pickling and removing scales formed on a steel sheet surface after hot rolling. In a roll in which the winding angle of a steel plate used for washing is 60 degrees or less, a thermal spray coating having a set structure in which carbides are dispersed in a metal matrix is coated on the surface. (2) The carbide added in (1) above is tungsten carbide (WC). (3) The composition ratio of tungsten carbide (WC) to be added in the above (2) is set to 10 to 40% by weight, or the area ratio occupied by tagustene carbide (WC) is 7 to 28 in an enlarged microscopic photograph of the structure.
To be in percent.
【０００７】（４）前記（２）又は（３）において添加
する炭化タングステン（ＷＣ）の粒径を１０から１００
μｍの粒状にして金属マトリックス中に過度の固溶を伴
わずに均等に分散させた皮膜とする。 （５）前記（１）において分散させた炭化物の周囲を構
成するマトリックス成分をＮi はＣｏを主たる成分とし
た合金又はＮi とＣｏの双方を含有した合金とすること
にある。(4) The particle size of the tungsten carbide (WC) added in (2) or (3) is 10 to 100.
The film is formed into particles having a particle size of μm and uniformly dispersed in the metal matrix without excessive solid solution. (5) The matrix component constituting the periphery of the carbide dispersed in the above (1) is an alloy in which Ni is a main component of Co or an alloy containing both Ni and Co.
【０００８】[0008]
【発明の実施の形態】熱間圧延後、鋼板表面に生成した
スケールを酸洗除去するライン設備に使用するロールの
溶射皮膜において炭化タングステン（ＷＣ）の粒が金属
マトリックス中に分散する形の組織構造とするのは炭化
タングステン（ＷＣ）を極力、マトリックス部分の金属
と反応させずに分散して添加させるのは炭化タングステ
ン（ＷＣ）の硬度及び高弾性率並びに靱性の優れた性質
を活用するためであるのと、マトリックス部分の金属に
タングステンが固溶してマトリックス部分に固くて脆い
金属間化合物相を形成するのを防ぐためである。BEST MODE FOR CARRYING OUT THE INVENTION After hot rolling, a structure in which tungsten carbide (WC) grains are dispersed in a metal matrix in a thermal spray coating of a roll used in a line facility for pickling and removing scale formed on the surface of a steel sheet. The structure is as follows. Tungsten carbide (WC) is added as dispersed as possible without reacting with the metal in the matrix part in order to utilize the excellent properties of tungsten carbide (WC) in hardness, high elastic modulus and toughness. This is to prevent tungsten from forming a solid solution in the matrix portion and forming a hard and brittle intermetallic compound phase in the metal in the matrix portion.
【０００９】マトリックス部分全体が硬化した場合に
は、皮膜自身の延性が低下して衝撃と剥離に対する耐久
性が大幅に低下する。溶射皮膜の金属マトリックス中に
分散させる炭化物を炭化タングステン（ＷＣ）とするの
は炭化タングステン自身のビッカース硬度がＨｖ１７８
０と従来技術の高クロム合金の中で析出形成する炭化ク
ロム（Ｃｒ3 Ｃ2)のビッカース硬度のＨｖ１３００より
高い値で、耐摩耗性が優れるからである。When the entire matrix portion is cured, the ductility of the film itself is reduced, and the durability against impact and peeling is greatly reduced. Tungsten carbide (WC) is used as the carbide dispersed in the metal matrix of the thermal spray coating because the Vickers hardness of the tungsten carbide itself is Hv178.
This is because chromium carbide (Cr 3 C 2 ), which is formed in a high chromium alloy of the prior art and has a Vickers hardness of higher than Hv1300, has excellent wear resistance.
【００１０】炭化タングステン以外の炭化物として炭化
ニオブ（ＮｂＣ）及び炭化モリブデン（Ｍｏ2 Ｃ）は炭
化物としての性質は優れるが素材の価格が高く皮膜の加
工費に高額になる。又、炭化物自身の弾性率が炭化ニオ
ブ（ＮｂＣ）は３４０００ｋｇ／ｍｍ2 、炭化チタン
（ＴｉＣ）は２２０００ｋｇ／ｍｍ2 であり炭化タング
ステン（ＷＣ）の７２０００ｋｇ／ｍｍ2 に比較して小
さい値である。そのため荷重を受けた場合の炭化物自体
の変形が炭化ニオブと炭化チタンは炭化タングステンに
比べて大きくなるために炭化物が脱落し易いと言う問題
があった。As carbides other than tungsten carbide, niobium carbide (NbC) and molybdenum carbide (Mo 2 C) have excellent properties as carbides, but the cost of the material is high and the processing cost of the coating is high. Further, elastic modulus niobium carbide carbide itself (NbC) is 34000kg / mm 2, titanium carbide (TiC) is a small value compared to 72000kg / mm 2 of tungsten carbide was 22000kg / mm 2 (WC). Therefore, there has been a problem that the carbide itself is easily deformed when a load is applied since the deformation of the carbide itself is larger in niobium carbide and titanium carbide than in tungsten carbide.
【００１１】溶射皮膜の金属マトリックス中に分散させ
る炭化タングステンの組成比率を重量パーセントで１０
〜４０パーセントとするのは１０パーセント未満では炭
化タングステンの分散密度が低く、溶射皮膜の平均ビッ
カース硬度がＨｖ６５０でしかなく耐摩耗性が不足する
ため、１０パーセントを下限としたものである。また、
４０パーセント超では炭化タングステンの分散が過密に
なり平均ビッカース硬度がＨｖ９００以上に上昇するこ
とに伴って、耐衝撃性が大幅に低下するためである。The composition ratio of tungsten carbide dispersed in the metal matrix of the thermal spray coating is 10% by weight.
If the content is less than 10%, the dispersion density of tungsten carbide is low, the average Vickers hardness of the thermal spray coating is only Hv650, and the wear resistance is insufficient, so the lower limit is 10%. Also,
If it exceeds 40%, the dispersion of tungsten carbide becomes too dense and the average Vickers hardness increases to Hv900 or more, so that the impact resistance is greatly reduced.
【００１２】溶射皮膜の金属マトリックス中に分散させ
る炭化タングステンを１０μｍから１００μｍの粒状に
して均等に分散させるのは炭化タングステンの粒径が１
０μｍ未満では分散して鋼板との接触界面に突出しても
鋼板側の粗度による凹凸が突出した炭化タングステン粒
径を上回るため金属マトリックスに接触して、当該部を
選択的に摩耗させるためである。炭化タングステンの粒
径の上限値を１００μｍとするのは１００μｍ超では炭
化タングステンの粒が鋼板から受ける荷重が大きくなり
脱落し易くなるのと、鋼板とロール間に相対的な速度差
が生じる場合はスリ疵となり鋼板の品位を損なうためで
ある。The reason why tungsten carbide dispersed in the metal matrix of the thermal spray coating is formed into particles of 10 μm to 100 μm and uniformly dispersed is that the tungsten carbide has a particle size of 1 μm.
If it is less than 0 μm, even if dispersed and projected to the contact interface with the steel sheet, the roughness due to the roughness of the steel sheet exceeds the projected tungsten carbide particle diameter, so that it comes into contact with the metal matrix and selectively wears the portion. . The upper limit of the particle size of tungsten carbide is set to 100 μm. If the upper limit of 100 μm is exceeded, the load applied to the tungsten carbide particles from the steel sheet increases and the tungsten carbide particles easily fall off. This is due to scratches and impairing the quality of the steel sheet.
【００１３】溶射皮膜の炭化物の周囲を構成するマトリ
ックス成分をＮi 又はＣｏを主たる成分とした合金又は
Ｎi とＣｏの双方を含有した合金とするのはＮi 及びＣ
ｏがきわめて安定な元素で炭化タングステンとの反応は
あるものの溶射条件を最適化して過度の固溶を抑制すれ
ば金属間化合物の生成が抑えられるためである。つまり
炭素及びタングステン並びにＮi 又Ｃｏの３元化合物相
の析出を最小とすることが出来き、皮膜の延性を保持出
来るためである。An alloy containing Ni or Co as a main component or an alloy containing both Ni and Co is used as the matrix component constituting the periphery of the carbide of the sprayed coating.
This is because, although o is an extremely stable element and reacts with tungsten carbide, the formation of intermetallic compounds can be suppressed by optimizing the spraying conditions to suppress excessive solid solution. That is, the precipitation of the ternary compound phase of carbon, tungsten, Ni and Co can be minimized, and the ductility of the film can be maintained.
【００１４】[0014]
【実施例】本発明者は以上の発明の連続酸洗ライン用溶
射ロールを実際の連続酸洗ラインの鋼板搬送ロールに適
用したので以下に説明する。酸洗ラインの入側において
コイルを巻きほどき払いだし後、鋼板の方向を水平にす
るために４５度の巻き付き角で鋼板に接触して回転する
直径が３００ｍｍφで胴長が２５００ｍｍのフレックス
ロール（デフレクターロールとも言う）に本考案の溶射
ロールを適用した。溶射皮膜は炭化タングステン（Ｗ
Ｃ）２０パーセントを合金中に分散して添加し、皮膜組
成をＷＣを２０パーセント、Ｎｉを６０パーセント、残
組成をＣ及びＳｉ並びにＦｅ他とし、ＷＣの粒径が５０
〜１００μｍ、溶射厚みを１．０ｍｍとした。当該溶射
皮膜を付与してフレックスロールにて厚み２．０〜９．
０ｍｍの鋼板を通板して連続使用した結果、従来の高ク
ロム合金の被覆材質を溶接肉盛りしたロールの摩耗速度
が０．００４ｍｍ／日であったのに対して当該発明の溶
射皮膜は０．００１１ｍｍ／日と摩耗速度の比率におい
て３．６倍の耐摩耗性を示した。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present inventor has applied the spraying roll for a continuous pickling line of the present invention to a steel sheet conveying roll in an actual continuous pickling line, and will be described below. After unwinding the coil on the entrance side of the pickling line, a roll of 300 mm in diameter and a body length of 2500 mm that rotates in contact with the steel plate at a winding angle of 45 degrees to make the direction of the steel plate horizontal ( The spraying roll of the present invention was applied to a deflector roll). The thermal spray coating is made of tungsten carbide (W
C) 20% dispersed in the alloy was added, the coating composition was 20% WC, 60% Ni, the remaining composition was C, Si, Fe, etc., and the particle size of WC was 50%.
１００100 μm, and the sprayed thickness was 1.0 mm. Apply the sprayed coating and apply a thickness of 2.0 to 9.
As a result of continuous use after passing a 0 mm steel plate, the spray rate of the sprayed coating of the present invention was 0, while the wear rate of the conventional roll coating of the high chromium alloy coating material was 0.004 mm / day. It showed 3.6 times the wear resistance in the ratio of 0.0011 mm / day to the wear rate.
【００１５】[0015]
【発明の効果】本発明の溶射ロールを連続酸洗ライン用
ロールに適用することにより、ロールの取替え周期が
３．６倍になりロールの加工費用と交換のための工事費
用が大幅に削減出来き、整備費を減額することが出来
た。By applying the thermal spray roll of the present invention to a roll for a continuous pickling line, the roll replacement cycle becomes 3.6 times, and the processing cost of the roll and the construction cost for replacement can be greatly reduced. Maintenance costs were reduced.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 司城 浩一 東京都中央区八重洲一丁目３番８号 日鉄 ハード株式会社内 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Koichi Shijo 1-3-8 Yaesu, Chuo-ku, Tokyo Nippon Steel Hard Co., Ltd.
Claims (5)
ルを酸洗除去する酸洗に使用する鋼板の巻き付き角度が
６０度以下のロールにおいて、炭化物が金属マトリック
ス中に分散する形の組織構造を有する溶射皮膜を表層に
有することを特徴とする連続酸洗ライン用溶射ロール。1. A structure in which carbide is dispersed in a metal matrix in a roll having a winding angle of 60 ° or less for a steel sheet used for pickling for removing scale generated on the steel sheet surface after hot rolling. A thermal spray roll for a continuous pickling line, characterized in that the thermal spray roll has a thermal spray coating having the following formula:
タングステン（ＷＣ）とした皮膜であることを特徴とす
る連続酸洗ライン用溶射ロール。2. A spraying roll for a continuous pickling line, characterized in that it is a film in which the carbide to be added is tungsten carbide (WC).
テン（ＷＣ）の組成比率が重量パーセントで１０〜４０
パーセントとするか、又は顕微鏡による組織拡大写真に
おいて炭化タングステン（ＷＣ）の占める面積割合が７
〜２８パーセントになるようにしたことを特徴とする連
続酸洗ライン用溶射ロール。3. The composition according to claim 2, wherein the composition ratio of tungsten carbide (WC) added is 10 to 40 in weight percent.
%, Or the area ratio of tungsten carbide (WC) in a microscopic photograph of the structure is 7%.
A thermal spray roll for a continuous pickling line, characterized in that the amount is set to 28%.
ングステン（ＷＣ）の粒径を１０から１００μｍの粒状
にして金属マトリックス中に過度の固溶を伴わずに均等
に分散させた皮膜であることを特徴とする連続酸洗ライ
ン用溶射ロール。4. A coating film in which the tungsten carbide (WC) added in claim 2 or 3 has a particle size of 10 to 100 μm and is uniformly dispersed without excessive solid solution in a metal matrix. A spraying roll for a continuous pickling line, characterized by:
囲を構成するマトリックス成分をＮi又はＣｏを主たる
成分とした合金又はＮi とＣｏの双方を含有した合金と
したことを特徴とする連続酸洗ライン用溶射ロール。5. A continuous pickling process according to claim 1, wherein the matrix component constituting the periphery of the dispersed carbide is an alloy containing Ni or Co as a main component or an alloy containing both Ni and Co. Thermal spray roll for line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33260597A JP3467396B2 (en) | 1997-12-03 | 1997-12-03 | Thermal spray roll for continuous pickling line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33260597A JP3467396B2 (en) | 1997-12-03 | 1997-12-03 | Thermal spray roll for continuous pickling line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11158669A true JPH11158669A (en) | 1999-06-15 |
| JP3467396B2 JP3467396B2 (en) | 2003-11-17 |
Family
ID=18256824
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33260597A Expired - Lifetime JP3467396B2 (en) | 1997-12-03 | 1997-12-03 | Thermal spray roll for continuous pickling line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3467396B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008100271A (en) * | 2006-10-20 | 2008-05-01 | Nippon Steel Corp | Roll for winding equipment for hot rolling and its adjusting method |
-
1997
- 1997-12-03 JP JP33260597A patent/JP3467396B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008100271A (en) * | 2006-10-20 | 2008-05-01 | Nippon Steel Corp | Roll for winding equipment for hot rolling and its adjusting method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3467396B2 (en) | 2003-11-17 |
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