JPS61165212A - Work roll for hot rolling excellent in resistance to seizure - Google Patents

Work roll for hot rolling excellent in resistance to seizure

Info

Publication number
JPS61165212A
JPS61165212A JP522185A JP522185A JPS61165212A JP S61165212 A JPS61165212 A JP S61165212A JP 522185 A JP522185 A JP 522185A JP 522185 A JP522185 A JP 522185A JP S61165212 A JPS61165212 A JP S61165212A
Authority
JP
Japan
Prior art keywords
roll
rolling
plating
base material
seizure
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
JP522185A
Other languages
Japanese (ja)
Inventor
Hiroshi Suzuki
弘 鈴木
Masaaki Washida
政昭 鷲田
Nobuo Kakehi
筧 伸雄
Yoshihiro Nakagawa
中川 義弘
Takashi Hashimoto
隆 橋本
Takeru Morikawa
長 森川
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.)
Kubota Corp
Nippon Steel Corp
Original Assignee
Kubota Corp
Nippon Steel Corp
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 Kubota Corp, Nippon Steel Corp filed Critical Kubota Corp
Priority to JP522185A priority Critical patent/JPS61165212A/en
Publication of JPS61165212A publication Critical patent/JPS61165212A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B27/00Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use

Abstract

PURPOSE:To prevent seized matters from sticking to the roll surface during hot rolling by plating the body surface of a rolling-roll base material with Ni, Cr or its alloy. CONSTITUTION:The body par of a rolling-roll base material is plated with Ni, Cr or its alloy to form a plated layer of 0.05-0.003mm thickness on it. The base material of roll is preferably constituted of an outer shell part having a composition consisting of, by weight %, 2.0-3.5% C, 0.5-1.5% Si, 0.5-1.5% Mn, <=0.1% P, <=0.1% S, 0.5-2.0% Ni, 10-25% Cr, 0.5-3.0% Mo and the balance, substantially Fe, and an axial center part consisting of cast iron. By forming siad plated layer, the seizure between a rolling material and the work roll surface is eliminated. And the wearing amount of roll is reduced, and the roll profile is improved.

Description

【発明の詳細な説明】 (瀘東上の利用分野) 本発明は熱間圧延における作動ロールの表面に生ずる焼
き付きを防止するロールに関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Application in Ludong) The present invention relates to a roll that prevents seizure occurring on the surface of a working roll during hot rolling.

(従来の技術) 近年我国に於ける熱同圧延は益々高級鋼化指同となシ、
特殊元系を含む鋼板の製造の伝令が多くなってきた。ま
た同時にvi@懺家の品買喪求も益々高くなり、熱間圧
延の作動ロールの表面性状に起因する微小な成品衆面疵
も大きな問題となっている。
(Conventional technology) In recent years, hot rolling in Japan has been increasingly used to produce high-grade steel.
There has been an increase in the number of orders for the production of steel plates containing special elemental systems. At the same time, demand for vi@Kinya's products is increasing, and small defects on finished products due to the surface properties of hot rolling rolls have become a major problem.

特に特殊元系を含む鋼板を熱同圧延する場合、作動ロー
ルと圧延材が非常にM91し易く、圧延中に作動ロール
の表面に焼き付き、それ自体が製品の表面に微小な疵を
付ける。
In particular, when a steel plate containing a special element system is co-rolled, the working roll and the rolled material are very susceptible to M91, which seizes onto the surface of the working roll during rolling, which itself causes minute scratches on the surface of the product.

!たこのような焼き付きのある状態のまま圧延が進行す
ると、この焼き付き部の上に更に焼き付きが起こって徐
々に成長し1作動ロール後方にある補強ロールと作動ロ
ールの間でこの焼き付き付層物は圧延反力により押しつ
ぶされる。押しつぶされる時、この付着物のおる作動ロ
ール表面に圧縮応力が集中する。さらに圧縮応力が集中
した状態で次の圧延が進行するが、圧延材からの熱影響
及び圧延中の摩擦熱等によりロール表面層は高温になp
1大きな熱応力が生じる。このような過程の繰シ返しに
よシ、付層物の成長と圧縮応力の増加によりついに作動
ロールの変形応力以上に’zL付着物直下の作動ロール
表面に塑性変形音生じる。
! If rolling continues with a callus-like seizure, further seizure will occur on top of this seizure and gradually grow, and this seizure layer will develop between the reinforcing roll and the working roll located behind one working roll. It is crushed by the rolling reaction force. When crushed, compressive stress is concentrated on the surface of the working roll where this deposit is located. The next rolling process progresses with compressive stress concentrated, but the surface layer of the roll reaches a high temperature due to the thermal influence from the rolled material and the frictional heat during rolling.
1 Large thermal stress occurs. As this process is repeated, the growth of the deposits and the increase in compressive stress eventually cause plastic deformation noise on the surface of the working roll directly below the deposits, which exceeds the deformation stress of the working roll.

″また、塑性変形している付着物直下の作動ロール表面
内部には微小で多数のクラックが発生し、非常に剥離し
やすい状態となっている。
``Furthermore, a large number of minute cracks are generated inside the surface of the actuating roll directly under the plastically deformed deposits, making it extremely easy to peel off.

従って、このような状態で圧延を続行すると圧延材と作
動ロールとの間の剪断力により焼き付き付着物及び付着
物直下の作動ロール表面が容易に欠は落ち5作動ロール
の円周方向に凹状の疵を生じる。
Therefore, if rolling is continued in such a state, the shearing force between the rolling material and the working roll will cause the seizing deposits and the surface of the working roll directly under the deposits to easily chip and form a concave shape in the circumferential direction of the working roll. Causes scratches.

この凹状疵は比較的深く鋭敏な形状を有しているため、
次の圧延材表面にこの作動ロール表面疵がプリントされ
1M品に有害な疵欠陥を付ける結果となる。そのため、
圧延全停止して頻繁に作動ロールを組替ることを余儀な
くされている。
This concave flaw has a relatively deep and sharp shape, so
These working roll surface flaws are printed on the surface of the next rolled material, resulting in harmful flaw defects on the 1M product. Therefore,
It is necessary to completely stop rolling and frequently change the working rolls.

従来このような問題に対して有効な対策がなく、関連す
る技術として冷間圧延の場合に使用されるロールにメッ
キを施す例がある(実公昭51−41072号公報)。
Conventionally, there has been no effective countermeasure against such problems, and a related technique involves plating rolls used in cold rolling (Japanese Utility Model Publication No. 51-41072).

しかし、この冷間圧延用作動ロールにメッキを施して表
面処理をする目的は。
However, what is the purpose of applying plating and surface treatment to this working roll for cold rolling?

ロール表面の光沢を増す事により鋼板の表面性状を改善
する点と、作動ロールの耐琴粍性の向上とが目的でめり
、熱間圧延用のように作動ロールの表面に高面圧と大き
な熱衝撃のかかる条件下で鋼板の作動ロールへの焼き付
きを防止することは考慮されていない。
The aim was to improve the surface properties of the steel sheet by increasing the gloss of the roll surface, and to improve the corrosion resistance of the working roll. No consideration is given to preventing the steel plate from seizing on the working roll under conditions of large thermal shock.

又、他の関連技術として特公昭51−2284号公報に
示されるものがおるが、この技術はロール表面にAtと
Cr f溶射するもので、熱処理用ノ・−スローラに用
いられており、熱間圧延ロールの焼き付き防止のために
メッキ金行なうものではない。
In addition, there is another related technology disclosed in Japanese Patent Publication No. 51-2284, which involves spraying At and Crf onto the roll surface, and is used for heat treatment no-slow rollers. Gold plating is not used to prevent rolling rolls from seizing.

(発明が解決しようとする問題点) 本発明は前記問題、即ち特殊元系を含む鋼板の熱間圧延
時、圧延ロール表向に被圧延材が焼き付き、それにより
圧延材に疵が生ずるという問題の解決全目的としたもの
である。
(Problems to be Solved by the Invention) The present invention solves the above-mentioned problem, that is, during hot rolling of a steel plate containing a special element system, the rolled material seizes on the surface of the rolling roll, thereby causing flaws in the rolled material. The overall purpose was to solve the problem.

(問題点を解決するための手段1作用)本発明によれば
、前述の目的を達成するため、熱間圧延に於いて、作動
ロール表面に焼き付き付層物が生成し難くするために、
圧延ロール基材の胴部表面に歯、Cr又はその合金をメ
ッキして焼き付き全防止するものである。ここに圧延ロ
ール基材とは本発明のメッキを施す前のロール金いう。
(Means for Solving Problems 1) According to the present invention, in order to achieve the above-mentioned object, in order to make it difficult for a seizing layer to form on the surface of a working roll during hot rolling,
The body surface of the roll base material is plated with teeth, Cr or its alloy to completely prevent seizure. Here, the rolling roll base material refers to the roll gold before being plated according to the present invention.

即ち、本発明の要旨は、圧延ロール基材の胴部に0.0
5〜0.003 m厚さのNl 、Cr又はその合金の
メッキ層を設けた事を特徴とする耐焼き付き性の優れた
熱間圧延用作動ロールである。
That is, the gist of the present invention is that 0.0
This working roll for hot rolling has excellent seizure resistance and is characterized by being provided with a plating layer of Nl, Cr or their alloys with a thickness of 5 to 0.003 m.

圧タ40−ル基材としては、0:2.O〜3.5%。As the pressure roll base material, the ratio is 0:2. O~3.5%.

Si:0.5〜1.5%、 Mn: 0.5〜1.5%
、P <0.1%、S<0.1%、Nl:0.5〜40
%、Cr: 10〜25%%Mo:0.5〜3.0%を
含み、残部実質的にFeよりなる外殻部と鋳鉄よりなる
軸芯部とからなる圧延ロール基材や、O:2.0〜3.
5%、 Sl:0.5〜1.5%、Mn:0.5〜1.
5%、P < 0.1%、S〈0.1%、 Ni: 0
.5〜2,0%、Cr:10−25%。
Si: 0.5-1.5%, Mn: 0.5-1.5%
, P < 0.1%, S < 0.1%, Nl: 0.5-40
%, Cr: 10 to 25%, Mo: 0.5 to 3.0%, and the remainder substantially consists of an outer shell portion made of Fe and a shaft core portion made of cast iron; 2.0-3.
5%, Sl: 0.5-1.5%, Mn: 0.5-1.
5%, P<0.1%, S<0.1%, Ni: 0
.. 5-2.0%, Cr: 10-25%.

Mo: 0.5〜3.0%、 Nbと■の一種又は二m
 k G 1.0%以下含み、残部実質的にFeよりな
る外殻部と鋳鉄よりなる軸芯部とからなる圧延ロール基
材音用いることが好ましい。また、圧延ロール基材の胴
部表面に凹凸を設けることも好ましい。
Mo: 0.5-3.0%, one or two of Nb and ■
It is preferable to use a rolling roll base material containing 1.0% or less of kG, the remainder of which consists of an outer shell made of substantially Fe and a shaft core made of cast iron. It is also preferable to provide irregularities on the surface of the body of the roll base material.

一般に、普通鋼圧延では焼き付き現象が少ないのに反し
て、特殊元素ヲ含んだ圧延材やステンレス圧延等ヤはこ
の焼き付き現象が多く見られ、特に高温での耐酸化性の
すぐれたステンし・ス圧延等に於いては圧延材のエツジ
部でこの現象が者しい。
In general, the seizure phenomenon is rare in rolled ordinary steel, but this phenomenon is often seen in rolled materials containing special elements and rolled stainless steel. In rolling, etc., this phenomenon is most noticeable at the edges of rolled materials.

この現象金種々解析調査した結果、普通鋼圧延では高温
の圧延材の表向には常に酸化物が生成し、作動ロール表
面と圧延材との接触部(ロールバイト間)には酸化物が
介在しているのに反し、高温での耐酸化性のすぐれた圧
延材では作動ロール表面と圧延材との接触部は酸化物の
ない、又は必っでも少ない状狸で接触するいわゆる金属
接触状態になっていることが明らかとなった。この様な
状態では作動ロール表面の摩耗部1組織的凹み又は欠落
部に圧延材が焼き伺き付着しやすい状態になる。
As a result of various analyzes and investigations of this phenomenon, it has been found that in ordinary steel rolling, oxides are always generated on the surface of the hot rolled material, and oxides are present at the contact area between the working roll surface and the rolled material (between the roll bites). On the other hand, in rolled materials with excellent oxidation resistance at high temperatures, the contact area between the working roll surface and the rolled material is in a so-called metal contact state where there is no oxide, or there is only a small amount of oxide. It became clear that this was the case. In such a state, the rolled material is likely to burn and adhere to the structural depressions or missing parts of the worn part 1 on the surface of the working roll.

一般に金属は同柚の材質の場合に非常に焼き付きやすく
、材質の化学組成特性が異なるに従って焼き付き離くな
る。従って圧延材と特性、化学組成のかけはなれた純金
属のNi、Cr又はその合金全第1図に示す様に圧延ロ
ール基材光面にメッキ(電解メッキ又は無電解メッキ)
してメッキ都1とすることにより圧Itjf、材の作動
ロール表面への焼き付き全防止してロール組替えの減少
を計かり、圧延の生産性全大巾に向上させるのである。
In general, metals are very likely to seize when they are made of the same material, and the seize separates as the chemical composition of the materials differs. Therefore, as shown in Figure 1, all pure metals such as Ni, Cr, or their alloys, which have different properties and chemical compositions from rolled materials, are plated (electrolytic plating or electroless plating) on the light surface of the rolling roll base material.
By using plating as the first layer, it is possible to completely prevent the rolling material from sticking to the surface of the working roll, reduce the number of roll changes, and greatly improve rolling productivity.

このときメッキ厚では0.05 ++m〜0.003目
の範囲円が良好である。メッキ厚さが0.05 m+i
超になると圧延ロール基材とメッキ層の機械的性質。
At this time, a good plating thickness ranges from 0.05 ++ m to 0.003 m. Plating thickness is 0.05 m+i
The mechanical properties of the rolling roll base material and plating layer become super.

物理的性質が異なり、圧延に於ける強い衝撃、応力、熱
によってメッキ層が剥離する問題が6L筐た0、 00
3 m未満でるるとメッキ層かうすいために剥離の問題
はないが、本発明の目的でらる作動ロールと圧延材の間
の金属接触を防止するという効果がなくなる。
The physical properties are different, and there is a problem that the plating layer peels off due to strong impact, stress, and heat during rolling.
If the length is less than 3 m, the plating layer is so thin that there is no problem of peeling, but the effect of preventing metal contact between the working roll and the rolled material, which is the object of the present invention, is lost.

次に、メッキ層’iNl、Cr又はその合金と限定した
理由について述べる。工業的に現在実施されているメッ
キとしてNl 、Cr、Ou、Feの純金属とその合金
が一般であるが、圧延温度から考えてOu及びその合金
は融点の問題がらり、 Feについては母材である圧延
ロール基材がre主体であり、メッキの効果が少なく、
かつメッキ厚さ全0.05 +m −0,003調に制
御する事が難しい。−万、姐、0「及びその合金は工業
的に広く用いられ、メッキ厚さの制御も容易で6!l)
、’Efc高温での耐酸化性にすぐれ。
Next, the reason why the plating layer is limited to iNl, Cr or an alloy thereof will be described. Pure metals such as Nl, Cr, Ou, and Fe and their alloys are commonly used as plating currently practiced industrially, but considering the rolling temperature, Ou and its alloys have problems with the melting point, and Fe is used in the base metal. A certain rolling roll base material is mainly made of re, and the plating effect is small.
Moreover, it is difficult to control the total plating thickness to 0.05 + m -0,003. - 10,000, 0, and their alloys are widely used industrially, and the plating thickness can be easily controlled6!l)
, 'Efc Excellent oxidation resistance at high temperatures.

圧延ロール基材と圧延材とのH[接接触全防止する目的
から最適である。
It is most suitable for the purpose of completely preventing contact between the rolling roll base material and the rolling material.

本発明の圧延ロール基材にメッキを施す時期については
、通常作動ロール(纂1回圧延に供される毎に表面性状
の確保及び熱膨張を加味したサーマルクラウンを付ける
ためにロールグラインダーで研磨されるので、作動ロー
ルを研磨し圧延機に組込む葦での工程でメッキ処理を施
すのが良い。
Regarding the timing of plating the rolling roll base material of the present invention, it is important to note that the rolling roll base material of the present invention is usually polished with a roll grinder to ensure surface quality and to attach a thermal crown that takes into account thermal expansion each time the rolling roll is subjected to one round of rolling. Therefore, it is best to perform the plating process during the process of polishing the operating roll and installing it in the rolling mill.

メッキ処理は第1図に示す様に圧延ロール基材胴部全面
に施すのが効果的であるが、メッキ層が厚<0.05m
に近くなるに従ってメッキ衣向が滑かになり、圧延に於
いて鋼板と作動ロールとの間の摩擦係数の低下をもたら
し、圧延材のスリップやカミ込み性の低下が懸念される
場合は次のようにすると良い。即ち、第2図に示す様に
胴1/3挙も可能である。これも本発明の目的である圧
延材焼き付き全防止するという意味では胴部全面にメッ
キを施すのと同様の効果がある。
It is effective to apply plating to the entire body of the roll base material as shown in Figure 1, but if the plating layer is less than 0.05 m thick,
As the plated coating gets closer to , the direction of the coating becomes smoother, which leads to a decrease in the coefficient of friction between the steel plate and the working roll during rolling.If there is a concern that the rolled material may slip or have a reduced tendency to jam, the following steps should be taken: It's good to do this. That is, as shown in FIG. 2, it is also possible to lift the torso by 1/3. This also has the same effect as plating the entire surface of the body in terms of completely preventing seizure of the rolled material, which is the objective of the present invention.

又、本発明においては、メッキを施す圧延ロール基材の
材質全以下の如くすることにより一層の効果を奏するこ
とかでさる。即ち、O:2.0〜3.5%、  81:
  0.5〜1.5 %、Mn:  0.5〜1.5%
、  P(01%、S<0.1 %、  Ni:  0
.5〜2.0 %、  Cr:10〜25%、 Mo:
 0.5〜3.0%、更に必要に応じてNbとVの一層
又は二種全容1.0%以下首肩し、残部実質的にFeよ
#)なる外殻部と鋼鉄よりなる軸芯部とからなる圧延ロ
ール基材とするのである。
Further, in the present invention, further effects can be obtained by using the following materials for the roll base material to be plated. That is, O: 2.0 to 3.5%, 81:
0.5-1.5%, Mn: 0.5-1.5%
, P(01%, S<0.1%, Ni: 0
.. 5-2.0%, Cr: 10-25%, Mo:
0.5 to 3.0%, and if necessary, one layer or two of Nb and V, with the total amount being 1.0% or less, and the remainder being substantially Fe, and a shaft core made of steel. The roll base material consists of parts.

本発明において圧廷ロール基材+Uクロムにすると好ま
しい理由について以下に述べる。
The reason why it is preferable to use the impression roll base material + U chromium in the present invention will be described below.

一般に、熱間圧延用ロール材質としてはアダマイト材、
高クロム材、高合金グし・ン材、高合金チルド材、ダク
タイル材が用いられる。
Generally, the roll material for hot rolling is adamite material,
High-chromium materials, high-alloy steel materials, high-alloy chilled materials, and ductile materials are used.

圧延ロール基材胴六面にNi 、Cr又はそれらの合金
でメッキ処理を施し、圧舛ロールとし−C供するに除し
ては圧延ロール基材とメッキ材の密層性、耐剥離性が問
題となる。
When the six sides of the roll base material body are plated with Ni, Cr, or an alloy thereof, and used as a rolled roll for use in -C, there are problems with the closeness and peeling resistance between the roll base material and the plating material. becomes.

作動ロールの胴表面は圧延材との接触による加熱に引続
いてロール冷却水によシ急冷される。この熱術撃により
ロール表面にはヒートクラックが微細に発生する。−万
、大きな圧延荷重によりロール表面には大きな圧縮面圧
がかかる。tfc、jH+圧延では作動ロールと補強ロ
ールの接触面圧(通常ヘルツ応力)がかかり、機械的応
力による損傷を与える。このような繰)返し熱衝撃、圧
延性■により作動ロールは表面損傷を受けるのであるが
、圧延ロール基材表面にメッキ処理を施す場合1作動ロ
ールの材質とメッキ層の密層性、耐剥離性の確保が重要
なキーポイントとなるのである。
The drum surface of the working roll is heated by contact with the rolled material and then rapidly cooled by roll cooling water. This thermal attack produces minute heat cracks on the roll surface. - 10,000, large compressive surface pressure is applied to the roll surface due to the large rolling load. In tfc, jH+ rolling, contact pressure (usually Hertzian stress) is applied between the operating roll and the reinforcing roll, causing damage due to mechanical stress. The working roll suffers surface damage due to such repeated thermal shocks and rolling properties, but when plating the surface of the rolling roll base material, the material of the working roll, the density of the plating layer, and the peeling resistance are important. Securing sex is an important key point.

同一条件で使用されたアダマイト、高クロム、ダクタイ
ル、高合金グし・ン、高合金チルド材の熱間圧延用作動
ロールに於けるヒートクラック全比較すると、アダマイ
ト、ダクタイルロールの場合、その太@さは大きく、か
つ一本一本のヒートクラックの深さも深い傾向にある。
A comparison of all heat cracks in working rolls for hot rolling of Adamite, high chromium, ductile, high alloy grease, and high alloy chilled materials used under the same conditions shows that in the case of Adamite and ductile rolls, the thickness The heat cracks tend to be large, and the depth of each heat crack tends to be deep.

−万、扁クロム、高合金グレン、高合金チルド材のロー
ルでは前の2材質に比べて微細でかつ深さも浅い。ただ
し、筒合金グし・ン、高合金チルド材のロールは材質の
機械的性質の面で高クロム材のロールに劣り、異常圧延
ではこのヒートクラックも部分的に深く入シ大きな損鴫
となる。
- Rolls made of flat chromium, high alloy grain, and high alloy chilled material are finer and shallower than the previous two materials. However, rolls made of cylindrical alloy steel and chilled high alloy materials are inferior to rolls made of high chromium materials in terms of the mechanical properties of the material, and in abnormal rolling, these heat cracks may partially penetrate deep and cause large losses. .

メッキ処理に於いてメッキm’e均一に母材に付けるた
めには母材の表面は無欠陥である事が望lしく、熱間圧
延用作動ロールの如きヒートクラックが発生し易い状態
で使用する場合にはヒートクラックが微細でかつ深さの
浅い事がメッキ処理を施す場合特に重要な因子で必る。
In order to apply the plating uniformly to the base material during the plating process, it is desirable that the surface of the base material be free of defects, and it is used in conditions where heat cracks are likely to occur, such as on working rolls for hot rolling. In this case, it is essential that the heat cracks be minute and shallow in depth, which is an especially important factor when performing plating processing.

また、高クロム材は篩温に於いて機械的性質の低下が少
なく、面圧の大きな圧延条件に於いても圧縮降伏応力が
高いため他材質よやも降伏し難い。さらに、補強ロール
と作動ロールの間で慟らくヘルツ応力にも降伏せず、メ
ッキのV’BM性に有利に作用する。
In addition, high chromium materials have less deterioration in mechanical properties at sieve temperatures and have a high compressive yield stress even under rolling conditions with high surface pressure, so they are more difficult to yield than other materials. Furthermore, it does not yield to the Hertzian stress between the reinforcing roll and the working roll, which has an advantageous effect on the V'BM properties of the plating.

次に各成分の好ましい範囲について述べる。Next, preferred ranges of each component will be described.

0は(Fe−Cr)703型炭化物を安定にする範囲で
Crとのバランスをとpつつ目的とする炭化物の量によ
って決定される。0が2.0%未満では炭化物の遣が減
少し、メッキ処理を施して使用した場合、通板中にメッ
キ層下のロール材が降伏してしまい。
0 is determined by the desired amount of carbide while maintaining a balance with Cr within a range that stabilizes the (Fe-Cr)703 type carbide. If the content of 0 is less than 2.0%, the amount of carbide decreases, and when used after plating, the roll material under the plating layer will yield during sheet passing.

メッキの剥#11を招く。0が365%超の場合は炭化
物量が多すぎ1機械的性質の劣化を来たす。
This causes plating peeling #11. When 0 is more than 365%, the amount of carbides is too large, resulting in deterioration of mechanical properties.

81は溶湯の脱酸のため0.5%以上は必要でらるが、
1.5%を越えると機械的性質の劣化を米たす。
81 requires 0.5% or more to deoxidize the molten metal,
If it exceeds 1.5%, mechanical properties will deteriorate.

Mnは別の補助脱酸剤として0.5%は必要であると共
にSの悪影響’(i−MnSとして防止するのに有用で
あるが、1.5%を越えると機械的性質、特に靭性の点
で劣化が著しい。
Mn is necessary as another auxiliary deoxidizing agent at 0.5% and is useful for preventing the adverse effects of S (i-MnS), but if it exceeds 1.5%, it deteriorates mechanical properties, especially toughness. There is significant deterioration at some points.

Pはロール材質に於いては少ない程望ましく。The smaller the amount of P in the roll material, the more desirable it is.

材質を脆くするという点から上uJt ’i o、 1
%未満とした。
From the point of view of making the material brittle, 1
less than %.

SについてもPと同様の意味で0.1%未満としンt:
S is also less than 0.1% in the same sense as P:
.

Niには焼入性全向上させるので積極的に硬度調整のた
め添加されるが、そのためには0.5%以上は必要であ
る。’! 7’C2,0%を越えると熱的に不安定な残
留オーステナイトが増え、硬度が上がりにくいと共に熱
影響が加わった場合に変態し、メッキの剥離を招く。
Ni is actively added to adjust the hardness because it improves the hardenability, but 0.5% or more is required for this purpose. '! When the content exceeds 7'C2.0%, thermally unstable retained austenite increases, making it difficult to increase hardness and transforming when exposed to heat, resulting in peeling of the plating.

Crは10%未満ではM、O型の炭化物が多く晶出し5
強靭性が低下し、炭化物の微細均一化が得られず、また
25%を越えるとM、10.型炭化物の量が増えて強靭
性が低下する。
When Cr is less than 10%, many M and O type carbides crystallize5.
Toughness decreases, fine and uniform carbide cannot be obtained, and if it exceeds 25%, M, 10. The amount of mold carbide increases and the toughness decreases.

Moは焼入・焼戻し抵抗を高めると同時に炭化物中に入
って炭化物硬度を高め、焼戻し軟化抵抗金増すために有
効であるが、0.5%未満ではこの効果がうす<、3.
0%超添加してもその効果は飽和するためコストヲ考慮
して3.0%以下とする。
Mo is effective in increasing the quenching and tempering resistance, and at the same time enters into the carbide to increase the hardness of the carbide and increase the tempering softening resistance, but if it is less than 0.5%, this effect is weak.
Even if it is added in excess of 0%, the effect will be saturated, so it is set at 3.0% or less in consideration of cost.

Nbは鋳造組織の微細化に効果があり、 Nbの添加に
より析出硬化が促進されるが、1.0%超添加してもそ
の効果は飽和するためコストヲ考慮して1.0X以下と
する。
Nb is effective in refining the casting structure, and precipitation hardening is promoted by the addition of Nb, but the effect is saturated even if it is added in excess of 1.0%, so it is set to 1.0X or less in consideration of cost.

VもNbと同様の目的で添加するが、1.0%超ではv
O炭化物が多くなり、  Cr炭化物の減少につながる
ためかえって強靭性が低下する。このため1.0%以下
とする。
V is also added for the same purpose as Nb, but if it exceeds 1.0%, V
Since O carbide increases and Cr carbide decreases, the toughness actually decreases. For this reason, it is set to 1.0% or less.

好ましい軸芯材について以下に述べる。Preferred core materials will be described below.

複合ロールの製造法としては中抜鋳造法、遠心力鋳造法
1機械的な固定法等があるが、熱間圧延用としては外殻
と軸部が冶金学的に結合しており、かつ製造コストの安
い遠心カ鋳造法會採用することが望ましい。
Manufacturing methods for composite rolls include hollow casting, centrifugal casting, and mechanical fixing, but for hot rolling, the outer shell and shaft are metallurgically connected, and manufacturing It is desirable to use the centrifugal casting method, which is inexpensive.

外層にCr宮有量の多い材質を使用し、軸芯部に一系材
料全使用した場合、外層内面のCrが軸芯部に拡故して
Crす有量の高い軸芯部を形成しても材料の強靭性は余
り劣化しない。しかし、このように軸芯sを銅系材料と
した場合、上型部の引は巣を防止するための押湯を多く
必要とし、コスト的に高くなり、葦た弾性係数が大きい
ので熱応力や残留応力の点でも不利である。
If a material with a high Cr content is used for the outer layer and all materials of the same type are used for the shaft core, Cr on the inner surface of the outer layer will spread to the shaft core and form a shaft core with a high Cr content. However, the toughness of the material does not deteriorate much. However, when the shaft core s is made of a copper-based material in this way, the drawing of the upper mold part requires a large number of feeders to prevent cavities, resulting in high costs, and the high elastic modulus of the reeds causes thermal stress. It is also disadvantageous in terms of residual stress.

材料とする事が望゛ましく、普通、西鉄又はダクタイル
鋳鉄がよい。なお、一般に普通鋳鉄及びダクタイル鋳鉄
とは第1表に示す化学組成のもの會云う。
The material is preferably Nishitetsu or ductile cast iron. Generally, ordinary cast iron and ductile cast iron refer to those having the chemical compositions shown in Table 1.

次に作動ロールとメッキ層の′#着性の改善について説
明する。
Next, the improvement of the adhesion between the working roll and the plating layer will be explained.

一般に電気メッキは母材とメッキ層の付着力は弱い。従
って、この付層力全増加させるために母材とメッキ層の
接触面積音大きくしてやる事が有効である。
Generally, in electroplating, the adhesion between the base material and the plating layer is weak. Therefore, in order to increase the total layering force, it is effective to increase the contact area sound between the base material and the plating layer.

飢クロムロールの組織は硬いM703型カーバイドとパ
ーライト又はマルテンサイトと少建の残留オーステナイ
トから成り立っておフ、ロール中心方向にカーバイドの
方向性を持った組織を呈している。従って、このカーバ
イドと基地の腐食程度の異なる事全利用して高クロムロ
ール基材の表面全メッキ処理の前処理として強酸で腐食
し、ロール基材表面全凹凸状にし、その後メッキ処理し
てメッキ層と母材でろるロール基材との接触面積を増や
してやる事が好ましい。
The structure of the starch chromium roll is composed of hard M703 type carbide, pearlite or martensite, and a small amount of retained austenite, and exhibits a structure with carbide orientation toward the center of the roll. Therefore, taking full advantage of the difference in the degree of corrosion between carbide and base, as a pretreatment for plating the entire surface of a high chromium roll base material, the roll base material surface is corroded with strong acid to make the entire surface uneven, and then plated. It is preferable to increase the contact area between the layer and the base material of the rolling roll.

なお、ロール基材表面を腐食する方法については上記の
化学反応による方法の他に電気的に腐食する方法でもよ
く、又腐食ではなくてショットやカットワイヤー等のシ
ョツトブラスト法、放電ダル法もロール基材表面を凹凸
状態にするために採用出来る。
As for the method of corroding the surface of the roll base material, in addition to the chemical reaction method described above, electrical corrosion may be used, and instead of corrosion, shot blasting method such as shot or cut wire method, discharge dull method, etc. It can be used to make the surface of the base material uneven.

(実施例) 以−へ発明の実施例を示す。(Example) Examples of the invention are shown below.

〔実施例1〕 ホラトス) IJツブミル仕上前段スタンド用作動ロー
ル(胴径600mψ×胴長145o關t×全の 長3500kIIIlt1 重盾5t9001g)ベー
ル基材胴表面部にNl 、Cr又はこれらの合金メッキ
金メッキ厚さ6〜34μmVC’fzるような種々の条
件で電気メッキした。そして、これらのロール全従来か
ら頻繁に焼き付きの見られるステンレス圧延のりち特に
フェライト系ステンレス(8U8430系)圧延のF2
スタンド作動ロールとして使用した。その結果、焼き付
きは闘められず圧延材は良好な肌を呈した。
[Example 1] Horatos) IJ tube mill finished operating roll for front stage stand (body diameter 600mψ x body length 145o x total length 3500kIIIlt1 heavy shield 5t9001g) Nl, Cr or alloy plating gold plating on the barrel surface of veil base material Electroplating was carried out under various conditions such that the thickness was 6 to 34 μm. All of these rolls are used for stainless steel rolling where seizures frequently occur, especially F2 rolling for ferritic stainless steel (8U8430 series).
Used as a stand operating roll. As a result, the seizure could not be overcome and the rolled material had a good texture.

〔実施例2〕 ホットストリップミル仕上前段スタンド用作動ロール(
胴径590間ψ×胴長145o鴫t×全長3500則t
b M量5t800に9)のロール基材胴表面部のみ全
メッキ厚さ23〜34μm(Nlメッキ)、14〜17
μm(Crメッキ)になる様な条件で電気メッキした。
[Example 2] Actuation roll for hot strip mill finishing front stage stand (
Torso diameter 590 ψ x Torso length 145mm x Total length 3500mm
b M amount 5t800 9) Total plating thickness only on the roll base material body surface part 23-34 μm (Nl plating), 14-17
Electroplating was carried out under conditions such that the thickness was μm (Cr plating).

ロール化学組成は第2表に示す通シである。The chemical composition of the roll is as shown in Table 2.

第2弐             (%)■ A : Niメッキ  メッキ厚さ23〜34μmB 
: Crメッキ   メッキ厚さ14〜17μmA、B
のロールをホットストリップミルのF2スタンド作動ロ
ールとして、圧延材の焼き付き付層による肌荒れの発生
し易いフェライト系ステンレス(SU8430系)全圧
延した。
2nd 2 (%) A: Ni plating Plating thickness 23-34 μmB
: Cr plating Plating thickness 14-17 μm A, B
The roll was used as the F2 stand operation roll of a hot strip mill to perform full rolling of ferritic stainless steel (SU8430 series), which is prone to surface roughness due to the baked-on layer of the rolled material.

その結果、13本通板後に於いても良好な表向性状を保
ち、焼き付きは全く認められなかった。
As a result, good surface properties were maintained even after 13 passes, and no burn-in was observed.

また、圧延材の先端及び後端通過時の衝撃力による凹マ
ークも全く認められず、メッキの剥離開所はなかった。
Furthermore, no concave marks were observed due to the impact force when the rolling material passed through the leading and trailing ends, and there were no peeling openings in the plating.

摩耗量については、Aロールではメッキ金施さない場合
の約115.Bロールテハ約1/7であシ、耐摩耗性の
向上効果も認められた。
Regarding the amount of wear, the amount of wear is approximately 115. The B roll thickness was reduced to about 1/7, and the effect of improving wear resistance was also observed.

〔実施例3〕 ホットストリップミル仕上前段スタンド用作動ロール(
胴径590IIII+lψ×胴長1450s+mtX全
長3500+mt、重量5t800助)のロール基材胴
表面部のみ全メッキ厚さ23〜34μrrL(Nlメッ
キ)、14〜17μ5(Crメッキ)になる様な条件で
電気メッキした。ロール化学組成は第3衣に示す通9で
ある。
[Example 3] Hot strip mill finishing front stage actuating roll (
A roll base material with a body diameter of 590 III + lψ x body length 1450 s + mt . The roll chemical composition is as shown in Figure 3.

A : Niメッキ  メッキ厚さ23〜34μmB 
: Crメッキ  メッキ厚さ14〜17μmA、Bの
ロール全ホットストリップミルのF2スタンド作動ロー
ルとして、圧延材の焼き付き伺着による肌荒れの発生し
易いフェライト系ステンレス(SUS430系)を圧延
した。
A: Ni plating, plating thickness 23-34μmB
: Cr plating Ferritic stainless steel (SUS430 series), which is prone to surface roughness due to seizure and adhesion of the rolled material, was rolled as the F2 stand operation roll of a full-roll hot strip mill with a plating thickness of 14 to 17 μm A and B.

その結果、10本通板後に於いても良好な表面性状を保
ち、焼き付きは全く認められなかった。
As a result, even after passing 10 sheets, good surface quality was maintained and no burn-in was observed.

また、圧延材の先端及び後端通過時の衝撃力による凹マ
ークも全く認められず、メッキの剥離箇所はなかった。
Furthermore, no concave marks were observed due to the impact force when the rolling material passed through the leading and trailing ends, and there was no peeling of the plating.

摩耗量について、へロールではメッキを施さない場合の
約115、Bロールでは約臀で必9、耐摩耗性の向上効
果も認められた。
Regarding the amount of wear, the amount of wear for the roll without plating was approximately 115, and the amount of wear for the B roll was approximately 9 at the buttock.The effect of improving wear resistance was also observed.

〔実施例4〕 ホットストリップミル仕上前段スタンド用作動ロール(
胴径600mψ×胴長1450簡t×全長3500mt
、重)15900 kr )のロール基材胴表面部のみ
を、メッキする前処理として塩[11:蒸留水1の80
℃水溶液で30分間腐食処理し。
[Example 4] Actuation roll for hot strip mill finishing front stage stand (
Body diameter 600mψ x body length 1450t x total length 3500mt
As a pretreatment for plating only the surface of the roll base material (15,900 kr), salt [11 parts distilled water 1 part 80
Corrosion treated with an aqueous solution at ℃ for 30 minutes.

その後水酸化ナトリウムで中和し、メッキ厚さ8〜15
μmになるよりに電気メッキ金施した。なお。
After that, it is neutralized with sodium hydroxide, and the plating thickness is 8 to 15 mm.
Electroplated gold was applied to the thickness of μm. In addition.

腐食処理しfc衣表面さは6μmでめった。After corrosion treatment, the surface thickness of the fc coating was reduced to 6 μm.

ロール化学組成は第4衣に示す通りである。The roll chemical composition is as shown in the fourth coating.

第4衆    (%) A : Niメッキ  メッキ厚さ27〜35μmB 
 :  Cr メッキ  メッキ厚さ 7〜10μmA
、Bのロール全ホットストリップミルのF3スタンド用
作動ロールとして、圧延材の焼き付き付着による肌荒れ
の発生し易いフェライト系ステンし・ス(SU8430
系)を圧延した。
Fourth group (%) A: Ni plating Plating thickness 27-35μmB
: Cr plating Plating thickness 7-10 μmA
, Roll B As the operating roll for the F3 stand of the hot strip mill, we used ferritic stainless steel (SU8430
series) was rolled.

その結果、20本通板後に於いても良好な表面性状を維
持し、焼き付きは全く認められなかった。
As a result, good surface quality was maintained even after 20 passes, and no burn-in was observed.

[1圧延材の先端及び後端通過時の衝撃力による凹マー
クも全く認められず、メッキの剥離個所はなかった。摩
耗量については、Aロールではメッキを施さない場合の
約173.Bロールでハ約115であり、耐摩耗性の向
上効果も認められた。
[1] There were no concave marks caused by the impact force when the rolled material passed through the front and rear ends, and there were no peeled-off spots in the plating. Regarding the amount of wear, the amount of wear is approximately 173. C of the B roll was approximately 115, and the effect of improving wear resistance was also observed.

(発明の効果) 以上詳述したように、本発明によれば作動ロール表面の
圧延材の焼き付きがなくなり、かつ作動ロールの摩耗量
の減少の改善、特にプロフィルの改善が認められ、作動
ロール表面性状の改善に大巾な効果が認められる。従っ
て1本発明により、表面性状のきわめて優れた熱延鋼板
の製造が可能となり1歩留りの向上はもとよυ作動ロー
ルの組替等の大巾な減少等、コストメリットも非常に高
くなる。
(Effects of the Invention) As described in detail above, according to the present invention, seizure of the rolled material on the surface of the working roll is eliminated, and an improvement in reducing the amount of wear on the working roll, especially an improvement in the profile, is observed, and the surface of the working roll is Significant effects on improving properties are recognized. Therefore, according to the present invention, it is possible to manufacture hot-rolled steel sheets with extremely excellent surface properties, which not only improves the yield but also greatly reduces the need for changing the υ operating rolls, resulting in very high cost benefits.

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

第1図はロール胴長方向全長にわたってメッキした本発
明ロール例の説明図。 第2図はロール胴長方向両端部のみメッキした本発明ロ
ール例の説明図である。 1:メッキ部、2:メッキなし部。
FIG. 1 is an explanatory diagram of an example of a roll of the present invention plated over the entire length in the longitudinal direction of the roll body. FIG. 2 is an explanatory diagram of an example of a roll of the present invention in which only both ends in the roll body length direction are plated. 1: plated area, 2: non-plated area.

Claims (4)

【特許請求の範囲】[Claims] (1)圧延ロール基材の胴部に0.05〜0.003m
m厚さのNi、Cr又はその合金のメッキ層を設けた事
を特徴とする耐焼き付き性の優れた熱間圧延用作動ロー
ル。
(1) 0.05 to 0.003 m in the body of the roll base material
An operating roll for hot rolling with excellent seizure resistance, characterized in that it is provided with a plating layer of Ni, Cr or an alloy thereof with a thickness of m.
(2)圧延ロール基材がC:2.0〜3.5%、Si:
0.5〜1.5%、Mn:0.5〜1.5%、P<0.
1%、S<0.1%、Ni:0.5〜2.0%、Cr:
10〜25%、Mo:0.5〜3.0%を含み、残部実
質的にFeよりなる外殻部と鋳鉄よりなる軸芯部とから
なる特許請求の範囲第1項記載の熱間圧延用作動ロール
(2) The rolling roll base material has C: 2.0 to 3.5% and Si:
0.5-1.5%, Mn: 0.5-1.5%, P<0.
1%, S<0.1%, Ni: 0.5-2.0%, Cr:
10 to 25%, Mo: 0.5 to 3.0%, and the remainder consists of an outer shell portion substantially made of Fe and a shaft core portion made of cast iron. Actuation roll.
(3)圧延ロール基材がC:2.0〜3.5%、Si:
0.5〜1.5%、Mn:0.5〜1.5%、P<0.
1%、S<0.1%、Ni:0.5〜2.0%、Cr:
10〜25%、Mo:0.5〜3.0%、NbとVの一
種又は二種を各1.0%以下含み、残部実質的にFeよ
りなる外殻部と鋳鉄よりなる軸芯部とからなる特許請求
の範囲第1項記載の熱間圧延用作動ロール。
(3) The rolling roll base material has C: 2.0 to 3.5% and Si:
0.5-1.5%, Mn: 0.5-1.5%, P<0.
1%, S<0.1%, Ni: 0.5-2.0%, Cr:
10 to 25%, Mo: 0.5 to 3.0%, containing 1.0% or less each of one or both of Nb and V, with the remainder essentially consisting of an outer shell portion made of Fe and a shaft core portion made of cast iron. A working roll for hot rolling according to claim 1, comprising:
(4)圧延ロール基材の胴部表面に凹凸を設けた特許請
求の範囲第1〜3項のいずれかの項記載の熱間圧延用作
動ロール。
(4) The working roll for hot rolling according to any one of claims 1 to 3, wherein the body surface of the roll base material is provided with irregularities.
JP522185A 1985-01-16 1985-01-16 Work roll for hot rolling excellent in resistance to seizure Pending JPS61165212A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP522185A JPS61165212A (en) 1985-01-16 1985-01-16 Work roll for hot rolling excellent in resistance to seizure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP522185A JPS61165212A (en) 1985-01-16 1985-01-16 Work roll for hot rolling excellent in resistance to seizure

Publications (1)

Publication Number Publication Date
JPS61165212A true JPS61165212A (en) 1986-07-25

Family

ID=11605138

Family Applications (1)

Application Number Title Priority Date Filing Date
JP522185A Pending JPS61165212A (en) 1985-01-16 1985-01-16 Work roll for hot rolling excellent in resistance to seizure

Country Status (1)

Country Link
JP (1) JPS61165212A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63174706A (en) * 1987-01-13 1988-07-19 Sumitomo Metal Ind Ltd Rolling roll having excellent edge wear resistance
JPS6487005A (en) * 1987-09-30 1989-03-31 Tocalo Co Ltd Roll for rolling process and its manufacture
JPH01258805A (en) * 1988-04-08 1989-10-16 Tocalo Co Ltd Roll for rolling process
WO2000051756A1 (en) * 1999-02-26 2000-09-08 Kanto Special Steel Works, Ltd. Roll for rolling

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63174706A (en) * 1987-01-13 1988-07-19 Sumitomo Metal Ind Ltd Rolling roll having excellent edge wear resistance
JPH0536122B2 (en) * 1987-01-13 1993-05-28 Sumitomo Metal Ind
JPS6487005A (en) * 1987-09-30 1989-03-31 Tocalo Co Ltd Roll for rolling process and its manufacture
JPH0469481B2 (en) * 1987-09-30 1992-11-06 Tocalo Co Ltd
JPH01258805A (en) * 1988-04-08 1989-10-16 Tocalo Co Ltd Roll for rolling process
JPH0469483B2 (en) * 1988-04-08 1992-11-06 Tocalo Co Ltd
WO2000051756A1 (en) * 1999-02-26 2000-09-08 Kanto Special Steel Works, Ltd. Roll for rolling
GB2367075A (en) * 1999-02-26 2002-03-27 Kanto Special Steel Works Ltd Roll for rolling

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