JPS61238407A - Compound roll and its production - Google Patents
Compound roll and its productionInfo
- Publication number
- JPS61238407A JPS61238407A JP7837285A JP7837285A JPS61238407A JP S61238407 A JPS61238407 A JP S61238407A JP 7837285 A JP7837285 A JP 7837285A JP 7837285 A JP7837285 A JP 7837285A JP S61238407 A JPS61238407 A JP S61238407A
- Authority
- JP
- Japan
- Prior art keywords
- core material
- layer material
- slag
- roll
- outside layer
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、新規な複合ロール及びその製造方法に係シ、
特にエレクトロス２グ再溶解によりロール心材あるいは
多層材を肉盛した熱間圧延用複合ロール及びその製造法
に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a novel composite roll and a method for manufacturing the same.
In particular, the present invention relates to a composite roll for hot rolling in which a roll core material or a multilayer material is overlaid by re-melting with electroless two, and a method for manufacturing the same.
最近のホットストリップミルは、高速高負荷で使用され
るために、鋳鉄系ワークロールはよシ高満足させること
は非常に困難である。そこでロール心材には強靭性、外
層材には耐摩耗性、耐熱きれつ性を付与させるため２糧
類の溶湯を冶金的に結合させた複合ロールが用いられて
いる。Modern hot strip mills are used at high speeds and high loads, so it is very difficult to satisfy cast iron work rolls. Therefore, composite rolls are used in which two types of molten metals are metallurgically combined to provide toughness to the roll core material and wear resistance and heat cracking resistance to the outer layer material.
複合ロールの製造方法として、例えば特開昭５６−５８
９４６号に示されるように、遠心力で外層材を形成した
後にロール６部を鋳込むいわゆる遠心鋳造法や特開昭５
３−１４４８２８号に記載のように、最初に外層材を鋳
込み、所要の外層材凝固層を確保した後にロール心材と
なる溶湯によって未凝固外層材を排出置換させる中抜法
がよく知られている。As a method for manufacturing a composite roll, for example, Japanese Patent Application Laid-Open No. 56-58
As shown in No. 946, the so-called centrifugal casting method, in which six rolls are cast after forming the outer layer material by centrifugal force, and the JP-A No. 5
As described in No. 3-144828, a hollowing method is well known in which the outer layer material is first cast, the required solidified layer of the outer layer material is secured, and then the unsolidified outer layer material is discharged and replaced by the molten metal that becomes the roll core material. .
しかし、これらの方法では強靭化をはかるためにロール
心材に多層材よりも融点の高い鋼糸の材料を用いると、
両者を完全に溶着させることが非常に困難となる。溶着
性を高めるためにはロール心材は多層材と同等もしくは
低融点の鋳鉄系にせざるを得ない。その結果、ロール心
′ｓ（軸部）の強靭化が十分できないという問題があっ
た。However, in these methods, if a steel thread material with a higher melting point than the multilayer material is used as the core material of the roll in order to strengthen it,
It becomes very difficult to completely weld the two together. In order to improve weldability, the roll core material must be made of cast iron, which has a low melting point or is equivalent to the multilayer material. As a result, there was a problem in that the roll core's (shaft portion) could not be sufficiently strengthened.
本発明の目的は、強靭な鋼糸の心材と耐摩耗性及び耐熱
きれつ性に優れた鋳鉄系の外層材からなる複合ロールを
提供するにある。またエレクトロスラグ再溶解により心
材と外層材の溶着を良好に行うことのできる方法を提供
することにある。An object of the present invention is to provide a composite roll comprising a strong steel thread core material and a cast iron outer layer material having excellent wear resistance and heat cracking resistance. Another object of the present invention is to provide a method that can successfully weld the core material and the outer layer material by remelting the electroslag.
本発明の複合ロールは耐摩耗性、耐熱きれつ性及び強靭
性を兼備えたものであって、マトリックス中に晶出黒鉛
が分散した組織を有する外層材と鋼組成のロール心材と
によって構成されておシ、どちらか一方を消耗電極とし
てエレクトロスラグ再溶解により他方に溶着させること
にある。The composite roll of the present invention has wear resistance, heat cracking resistance, and toughness, and is composed of an outer layer material having a structure in which crystallized graphite is dispersed in a matrix and a roll core material of steel composition. The second method is to use one of the electrodes as a consumable electrode and weld it to the other by remelting the electroslag.
本発明に係る複合ロールのロール心材は好ましくはＣＯ
，３〜０．５重量％、０．５〜１．５重量％Ｃｒ鋼から
なるが、焼もどし硬さがＨ８３０〜５０であシ、ｐｅ
−ｃ−ｓｉ−Ｍｒｌ系にＮｉ、Ｃｒ。The roll core material of the composite roll according to the present invention is preferably CO
, 3-0.5% by weight, 0.5-1.5% by weight of Cr steel, but the tempering hardness is H830-50, PE
-Ni and Cr in the c-si-Mrl system.
ＭＯ，Ｖ、Ｗなどの元素を適当量含有し、その他通常の
不純物から構成されるものである。焼もどし硬さについ
て説明すると、硬さがＨ８３０未満では強度が不足し、
圧延時にロール変形やロールネック部の損傷を招く。ま
たＨ８５０を超えると、強靭性が低下し、ロール心材に
強靭性を具備せしめようとする本発明の目的を損なう不
都合が生じる。It contains appropriate amounts of elements such as MO, V, and W, and is composed of other usual impurities. Regarding tempering hardness, if the hardness is less than H830, the strength will be insufficient.
This results in roll deformation and damage to the roll neck during rolling. Moreover, if it exceeds H850, the toughness decreases, causing problems that impair the purpose of the present invention, which is to provide the roll core material with toughness.
多層材は好ましくは重量で、Ｃ３〜４％、Ｓ１１．５〜
２５％、Ｍｎ００３〜１％、ＮｉＯ，５〜１．５％、Ｃ
ｒ０．３〜０．８％からなる鋼からなる。The multilayer material preferably has C3-4% and S11.5-4% by weight.
25%, Mn003~1%, NiO, 5~1.5%, C
Made of steel containing r0.3-0.8%.
エレクトロスラグ再溶解は、鋳鉄組成のシェル内部ある
いは鋼組成のロール心材の外周を同心的に水冷鋳壓で囲
んで形成された空所内のスラグ浴中に消耗電極の先端を
挿入し、スラグ浴を介して前記消耗電極に通電すること
によって行われ、スラグ浴の抵抗熱により消耗電極、シ
ェルあるいはロール心材の空所壁面が溶解され、それら
の混合物が空所を充てんしていき、複合ロールが製造さ
れる。Electroslag remelting involves inserting the tip of a consumable electrode into a slag bath in a cavity formed by surrounding the inside of a shell made of cast iron or the outer periphery of a roll core made of steel concentrically with a water-cooled casting crock, and then the tip of the consumable electrode is inserted into the slag bath. The consumable electrode is melted by the resistive heat of the slag bath, and the cavity walls of the shell or roll core are melted, and the mixture fills the cavity, producing a composite roll. be done.
エレクトロスラグ再溶解によって複合ロールを製造する
と、シェルあるいは心材の円周方向及び心材あるいはス
ラグ浴に円周方向の回転を付与することによって溶込み
の均一化がはかられる。When a composite roll is manufactured by electroslag remelting, uniform penetration is achieved by imparting circumferential rotation to the shell or core material and to the core material or slag bath in the circumferential direction.
本発明者等は、ロール心材と多層材との溶着性について
種々検討した結果、ロール心材と多層材の不溶着は溶着
界面にスラグスキンが生成し、それがそのま＼残留する
ために生じることを見い出し友。スラグスキンの生成を
防止するためには、スラグの液相線温度を外・層材の液
相線温度以下にする必要があることがわかった。As a result of various studies on the welding properties between the roll core material and the multilayer material, the present inventors found that the non-welding of the roll core material and the multilayer material occurs because a slag skin is generated at the welding interface and remains as it is. Find a friend. It was found that in order to prevent the formation of slag skin, the liquidus temperature of the slag needs to be lower than the liquidus temperature of the outer layer material.
すなわち、第１図に示す本発明の結果から明らかなよう
に、ロール心材と外層材の溶着界面に巻き込まれたスラ
グスキンの厚さは、融点の差ΔＴ（スラグスキンの液相
線温度−外層材の液相線温度）に関係し、スラグの液相
線温度が外層材の液相線温度よりも低い領域ではスラグ
の巻き込みが生ぜず、ロール心材と外層材は完全に溶着
することがわかる。なお、第１図はａ、 ７ Ｘ Ｃ−
１７％５ｉ−０，２２％Ｍｎ−０，０３５％Ｐ−０，０
１２％Ｓよシな ゛る内径４０麿、外径１１２ｍ＋、高
さ２５０ａｍのシェル内部空所にＪＩ８規格８４５Ｃよ
すなる直径２２ｍの消耗電極を挿入し、電圧３０Ｖ１電
流８００Ａでエレクトロスラグ再溶解を行つ之結果を示
したものでろる。That is, as is clear from the results of the present invention shown in FIG. It can be seen that in the region where the liquidus temperature of the slag is lower than the liquidus temperature of the outer layer material, no slag entrainment occurs and the roll core material and outer layer material are completely welded. . In addition, Fig. 1 shows a, 7 X C-
17%5i-0,22%Mn-0,035%P-0,0
A consumable electrode with a diameter of 22 m and made of JI8 standard 845C was inserted into the hollow space inside the shell with an inner diameter of 40 mm, an outer diameter of 112 m +, and a height of 250 am, made of 12% S, and the electroslag was remelted at a voltage of 30 V and a current of 800 A. It shows the results of the process.
一方、マトリックス中の黒鉛の形状はロールの性能例え
ば耐摩耗性、耐熱きれつ性あるいは強度に大きく影響し
、黒鉛は球状であることが望ましい。しかしながら、消
耗電極あるいはシェルに黒鉛球状化率の良好な鋳鉄を用
い九としても、一般的な組成のスラグを用いたエレクト
ロスラグ再溶解では黒鉛形状が不規則となる。第２図は
その一例を示したもので、同図（ａ）はエレクトロスラ
グ再溶解前のミクロ組織、（ｂ）は溶解後のミクロ組織
を示す。第２図（ｂ）はエレクトロスラグ再溶解によ）
黒鉛形状がくずれ、チャンキー状及び共晶状黒鉛が晶出
している。なお、第２図（ｂ）は第１図と同様の消耗電
極、シェルを用い、スラグを４０％ＣａＦｓ−３０％Ａ
ｔ５Ｏｓ ３０％ＣａＯとして３０ｖ。On the other hand, the shape of the graphite in the matrix greatly affects the performance of the roll, such as abrasion resistance, heat-cracking resistance, or strength, and it is desirable that the graphite be spherical. However, even if cast iron with a good graphite spheroidization rate is used for the consumable electrode or shell, the shape of the graphite becomes irregular when electroslag is remelted using slag of a general composition. FIG. 2 shows an example of this, in which (a) shows the microstructure before electroslag is remelted, and (b) shows the microstructure after melting. Figure 2 (b) is due to electroslag remelting)
The graphite shape is distorted and chunky and eutectic graphite is crystallized. In addition, Fig. 2(b) uses the same consumable electrode and shell as Fig. 1, and the slag is 40% CaFs-30% A.
t5Os 30v as 30% CaO.
黒鉛球状化方法として、エレクトロスラグ再溶解による
接種効果の低下を見込んで予め鋳鉄中に接種効果を有す
るＭｇ、Ｃｅを多く含有させておく方法が考えられるが
、一定の歩留を確保することが困難である。また、エレ
クトロスラグ再溶解中に接種剤を添加する方法では、蒸
気圧の高いＭｇ、Ｃｅはスラグ浴面で蒸発して大気中に
散逸してしまうので、接種効果を発揮するだけの量を残
留させるのが困難である。As a graphite spheroidization method, it is possible to include a large amount of Mg and Ce, which have an inoculating effect, in cast iron in advance in anticipation of a decrease in the inoculating effect due to electroslag remelting, but it is difficult to ensure a constant yield. Have difficulty. In addition, in the method of adding inoculant during electroslag remelting, Mg and Ce, which have high vapor pressure, evaporate on the slag bath surface and dissipate into the atmosphere, so only a sufficient amount remains to exert the inoculating effect. It is difficult to do so.
本発明者等は黒鉛球状化について種々検討した結果、球
状化スラグ系中にＭｇＦｚ６るいはＣｅＦｓ及びＭｇＯ
の少なくとも１種を１０〜３５重量％添加することで可
能なことがわかった。接種処理はスラグ中でイオン化し
たＭｇ６るいはＣｅとの反応により行うものでラシ、シ
かも鋳鉄溶湯は常時スラグ浴と接しているので効率よく
接種処理を行うことができる。As a result of various studies on graphite spheroidization, the present inventors found that MgFz6 or CeFs and MgO were added to the spheroidized slag system.
It has been found that this is possible by adding 10 to 35% by weight of at least one of the following. The inoculation process is carried out by reaction with ionized Mg6 or Ce in the slag, and since the molten cast iron is always in contact with the slag bath, the inoculation process can be carried out efficiently.
第３図は本発明の一例を示したもので、溶着部で２５％
添加し、第１図の方法と同一条件でエレクトロスラグ再
溶解した。同図から明らかなように、Ｍｇの接種効果に
より黒鉛の球状化は良好でお夛、第２図の）にみられた
よりなチャンキー及び共晶状黒鉛の晶出は認められない
。Figure 3 shows an example of the present invention, in which 25%
The electroslag was added and the electroslag was remelted under the same conditions as in the method shown in FIG. As is clear from the figure, due to the inoculation effect of Mg, the graphite was well spheroidized, and the chunky and eutectic graphite crystallization seen in Figure 2) was not observed.
本発明において、エレクトロスラグ再溶解に際して用い
られるスラグはロール心材と外層材の溶着外画へのスラ
グ巻き込みを防止して溶着を確実に行い、同時に黒鉛球
状化をはかることのできる組成にある。すなわち、スラ
グ系中ＫＭｇＦｘ６るいはＣａｒｓ及びＭｇＯの少なく
とも１種を１０〜３５重量％添加し、かつスラグの液相
線温度が外層材の液相線温度以下の組成におる。In the present invention, the slag used in electroslag remelting has a composition that can prevent the slag from being caught in the welding area between the roll core material and the outer layer material, ensure welding, and at the same time make graphite spheroidized. That is, 10 to 35% by weight of at least one of KMgFx6, Cars, and MgO is added to the slag system, and the liquidus temperature of the slag is lower than the liquidus temperature of the outer layer material.
スラグ中へのＭｇＦ＊６るいはＣｅＦｓ及びＭｇＯの添
加はスラグの液相線温度を低下させ、かつ黒鉛球状化に
有効であるが、添加量が１０重量％未満では効果が少な
く、３５重量％よシ大くなると電気抵抗が小さすぎて発
熱量不足を招き、かつスラグの蒸気圧が高くなυ安定し
几溶解が困難になる。Addition of MgF*6 or CeFs and MgO to slag lowers the liquidus temperature of slag and is effective in making graphite nodular, but if the amount added is less than 10% by weight, the effect is small, and if the amount is less than 10% by weight, If the slag becomes too large, the electrical resistance will be too low, resulting in insufficient heat generation, and the vapor pressure of the slag will be high and stable, making it difficult to melt.
本発明による複合ロールの製造方法の一例として、ロー
ル心材の外周に設は九空所を溶融金属で充てんする場合
について第４図に基づき説明する。As an example of the method for manufacturing a composite roll according to the present invention, a case will be described based on FIG. 4 in which nine cavities provided on the outer periphery of the roll core are filled with molten metal.
水冷定盤１上に水冷鋳型２を設置し、その内部に同心的
に鋼組成を有するロール心材３を置き、空間に鋳鉄組成
を有して外層材を形成する消耗電極４を挿入する。消耗
電極４の形状は棒状、パイプ状のいずれでもよい。なお
、この実施例では電極が１個の筒状であるが、２個以上
電極を設けてもよい。水冷定盤１上にはケーブル５の一
端が接続され、ケーブル５の他端は電源６へ接続される
。A water-cooled mold 2 is placed on a water-cooled surface plate 1, a roll core material 3 having a steel composition is placed concentrically therein, and a consumable electrode 4 having a cast iron composition forming an outer layer material is inserted into the space. The shape of the consumable electrode 4 may be either rod-like or pipe-like. In this embodiment, one cylindrical electrode is used, but two or more electrodes may be provided. One end of a cable 5 is connected to the water-cooled surface plate 1, and the other end of the cable 5 is connected to a power source 6.
以上の状態でホットスタートあるいはコールドスタート
法によってエレクトロスラグ再溶解をスタートさせる。Under the above conditions, electroslag remelting is started using a hot start or cold start method.
消耗電極４は一端全スラグ浴７中に浸漬し、他９ｓをケ
ーブル８を介して電源６へ接続する。スラグ浴７の液相
線温度は外層材の液相線温度よ）低く、かつ黒鉛球状化
が図られる組成に調整される。The consumable electrode 4 is completely immersed in the slag bath 7 at one end, and the other end 9s is connected to the power source 6 via a cable 8. The liquidus temperature of the slag bath 7 is lower (than the liquidus temperature of the outer layer material), and the composition is adjusted so that graphite spheroidization is achieved.
消耗電極４はスラグ浴７の抵抗熱によって溶解して溶融
金属となシ、スラグ浴７の下部に溶融金属浴１０を形成
する。そして凝固して外層材９となって空所を充てんし
ていく。また、溶融金属浴１０はロール心材３及び水冷
鋳型２によって冷却されるために凝固組織が微細になる
。その結果、マトリックス中の球状黒鉛は微細にかつ均
一に分布して耐熱きれつ性が向上する。The consumable electrode 4 is melted into molten metal by the resistance heat of the slag bath 7, forming a molten metal bath 10 below the slag bath 7. Then, it solidifies and becomes the outer layer material 9, which fills the void. Further, since the molten metal bath 10 is cooled by the roll core material 3 and the water-cooled mold 2, the solidified structure becomes fine. As a result, the spheroidal graphite in the matrix is finely and uniformly distributed, improving the heat resistance.
内径４００ｍ＋、高さ１１０００ａの水冷鋳型を定盤上
に設置し、その内部に同心的に直径２８０騙、高さ１５
００ｍの０．４重量％Ｃ−１重景％Ｃｒ鋼から成る２７
−ル心材を配して形成された空所に３．２重量％Ｃ−１
，８重量％３ｉ−０，４重量％Ｍｎ−１重量％Ｎｉ−０
，５重量％Ｃｒ、残部Ｆｅから成る円筒状消耗電極（外
層材）を挿入し、６０重量％ＣａＦｚ ２０重量％Ｃ
ａＯ−２０重量％５１０２から成るスラグに重量比１対
１のＭｇＦ２及びＭｇＯ’に１５重量％添加し、エレク
トロスラグ再溶解を行った。電圧は３０〜３５ｖ１電流
は７ｋＡとした。得られた複合ロールを切断して調査し
た結果、ロール心材と多層材の接合界面にスラグ巻き込
みがみられず、溶着は良好であった。ま九、黒鉛は微細
に分布し、球状化も良好であった。A water-cooled mold with an inner diameter of 400 m+ and a height of 11,000 a is installed on a surface plate, and a mold with a diameter of 280 m and a height of 15 mm is placed concentrically inside the mold.
00m 27 made of 0.4wt% C-1 heavy weight% Cr steel
- 3.2% by weight C-1 in the void formed by placing the core material
, 8% by weight 3i-0, 4% by weight Mn-1% by weight Ni-0
A cylindrical consumable electrode (outer layer material) consisting of , 5% by weight Cr and the balance Fe was inserted, and 60% by weight CaFz 20% by weight C was inserted.
To the slag consisting of aO-20% by weight 5102, 15% by weight of MgF2 and MgO' were added in a weight ratio of 1:1, and the electroslag was redissolved. The voltage was 30 to 35v and the current was 7kA. As a result of cutting and examining the obtained composite roll, no slag was observed at the bonding interface between the roll core material and the multilayer material, and the welding was good. Nineteenth, graphite was finely distributed and spheroidized well.
以上の実施例から明らかなように、鋼組成のロリ他方に
溶着させることによって、表面部が耐摩耗性及び耐熱き
れつ性に優れ、６部が強靭性に優れた複合ロールを製造
することができる。さらに特定の組成を有するスラグを
用いることによってロール心材と多層材の溶着界面にス
ラグ巻き込みを生ぜず、溶着が完全に行われ、かつ黒鉛
球状化を良好に行うことができる。As is clear from the above examples, it is possible to manufacture a composite roll in which the surface part has excellent wear resistance and heat cracking resistance and the 6 part has excellent toughness by welding the steel composition to the other roll. can. Further, by using a slag having a specific composition, no slag entrainment occurs at the welding interface between the roll core material and the multilayer material, complete welding is performed, and graphite spheroidization can be performed satisfactorily.
第１図は巻き込みスラグの厚さと融点の差の関係を示す
線図、第２図は従来スラグによるエレクトロスラグ再溶
解前後の外層材の金属組織を示す写真、第３図は本発明
を実施した外層材の金属組織を示す写真、第４図は本発
明のロールの製造法の一例を示す構成図である。
ｌ・・・水冷定盤、２・・・水冷鉤形、３・・・ロール
心材、日Figure 1 is a diagram showing the relationship between the thickness of the slag involved and the difference in melting point, Figure 2 is a photograph showing the metallographic structure of the outer layer material before and after remelting the electroslag using conventional slag, and Figure 3 is a diagram showing the relationship between the thickness of the slag and the difference in melting point. FIG. 4 is a photograph showing the metal structure of the outer layer material, and is a configuration diagram showing an example of the method for manufacturing the roll of the present invention. l...Water-cooled surface plate, 2...Water-cooled hook shape, 3...Roll core material, day
Claims (1)
とからなる複合ロールにおいて、前記心材は鋼組成より
なり、前記外層材は晶出黒鉛がマトリックス中に分散し
た組織を有する鋳鉄組成よりなり、前記心材と外層材と
は溶着していることを特徴とする複合ロール。 ２、鋼組成から成るロール心材と、晶出黒鉛がマトリッ
クス中に分散した組織の鋳鉄組成から成る多層材で構成
される複合ロールの製造方法において、前記ロール心材
または外層材のいずれかを、スラグ中にＭｇＦ＿２、Ｃ
ｅＦ＿３及びＭｇＯの少なくとも１種を１０〜３５重量
％含有し、かつスラグの液相線温度が外層材の液相線温
度以下であるスラグを用いたエレクトロスラグ再溶解に
より形成することを特徴とする複合ロールの製造方法。[Claims] 1. A composite roll consisting of a roll core material and an outer layer material having better wear resistance than the core material, wherein the core material is made of steel, and the outer layer material has crystallized graphite dispersed in a matrix. 1. A composite roll comprising a cast iron composition having a texture, wherein the core material and the outer layer material are welded together. 2. In a method for manufacturing a composite roll comprising a roll core material made of steel and a multilayer material made of a cast iron composition with a structure in which crystallized graphite is dispersed in the matrix, either the roll core material or the outer layer material is made of slag. MgF_2,C inside
It is characterized by being formed by electroslag remelting using slag containing 10 to 35% by weight of at least one of eF_3 and MgO and having a liquidus temperature of the slag that is lower than the liquidus temperature of the outer layer material. Method for manufacturing composite rolls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7837285A JPS61238407A (en) | 1985-04-15 | 1985-04-15 | Compound roll and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7837285A JPS61238407A (en) | 1985-04-15 | 1985-04-15 | Compound roll and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61238407A true JPS61238407A (en) | 1986-10-23 |
Family
ID=13660177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7837285A Pending JPS61238407A (en) | 1985-04-15 | 1985-04-15 | Compound roll and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61238407A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04220105A (en) * | 1990-02-08 | 1992-08-11 | Hitachi Ltd | Composite roll for rolling metal, manufacture thereof and rolling mill |
| CN1059365C (en) * | 1995-12-12 | 2000-12-13 | 冶金工业部钢铁研究总院 | Manufacture of composite milling roller |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572862A (en) * | 1980-06-04 | 1982-01-08 | Hitachi Ltd | Composite roll and its manufacture |
-
1985
- 1985-04-15 JP JP7837285A patent/JPS61238407A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS572862A (en) * | 1980-06-04 | 1982-01-08 | Hitachi Ltd | Composite roll and its manufacture |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04220105A (en) * | 1990-02-08 | 1992-08-11 | Hitachi Ltd | Composite roll for rolling metal, manufacture thereof and rolling mill |
| CN1059365C (en) * | 1995-12-12 | 2000-12-13 | 冶金工业部钢铁研究总院 | Manufacture of composite milling roller |
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