JPH09209071A - Composite roll for rolling and its production - Google Patents
Composite roll for rolling and its productionInfo
- Publication number
- JPH09209071A JPH09209071A JP1851796A JP1851796A JPH09209071A JP H09209071 A JPH09209071 A JP H09209071A JP 1851796 A JP1851796 A JP 1851796A JP 1851796 A JP1851796 A JP 1851796A JP H09209071 A JPH09209071 A JP H09209071A
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- Prior art keywords
- layer
- less
- outer layer
- intermediate layer
- molten metal
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鉄鋼圧延用複合ロ
ール及びその製造方法に関する。TECHNICAL FIELD The present invention relates to a composite roll for steel rolling and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】従来、鉄鋼圧延用複合ロールは、圧延材
に接触する外層(使用層)を耐摩耗性にすぐれるハイス系
鋳鉄材から形成し、内層を強靱性にすぐれる鋳鋼材から
形成したものが使用されている。2. Description of the Related Art Conventionally, in a composite roll for steel rolling, an outer layer (used layer) that comes into contact with a rolled material is formed of a high-speed cast iron material having excellent wear resistance, and an inner layer is formed of a cast steel material having excellent toughness. What has been used is being used.
【０００３】[0003]
【発明が解決しようとする課題】しかし、このロールを
遠心力鋳造により作製したとき、外層と内層との間に溶
着不良が発生したり、内層が所望通りの強靱性を具備す
ることができない問題があった。遠心力鋳造法により、
外層と内層を冶金学的に一体化させるには、まず、外層
を鋳込み、外層の外面が凝固した後、内面が未凝固の段
階で内層の溶湯を鋳込むが、外層のハイス系鋳鉄材は、
所定の耐摩耗性を確保するためにＣを多く含有して凝固
温度が低いのに対し、内層の鋳鋼材は所定の強靱性を確
保するためにＣの含有量は少なく凝固温度が高く、その
溶湯温度も高い。このため、高温の内層溶湯を投入する
と、外層中、凝固を開始したばかりの部分まで再び溶融
状態となり、外層成分(Ｃ、Ｃｒ、Ｍｏ、Ｗ、Ｖ等)の内
層成分への混入量が必要以上に増える結果、内層が高Ｃ
化及び高合金化して、内層の材質劣化による強靱性の低
下を招くことになる。一方、外層成分の内層への混入量
を少なくするために、外層内面の未凝固部分が少なくな
るまで温度を低下させてから内層の溶湯を鋳込むように
すると、外層と内層の溶着不良を生ずることになる。However, when this roll is manufactured by centrifugal casting, defective welding occurs between the outer layer and the inner layer, and the inner layer cannot have desired toughness. was there. By centrifugal casting method,
In order to integrate the outer layer and the inner layer metallurgically, first, the outer layer is cast, the outer surface of the outer layer is solidified, and then the molten metal of the inner layer is cast when the inner surface is not solidified. ,
While a large amount of C is contained to secure a predetermined wear resistance and the solidification temperature is low, the cast steel material of the inner layer has a small content of C and a high solidification temperature to secure a predetermined toughness. The molten metal temperature is also high. For this reason, when the high-temperature inner layer molten metal is added, the state of the outer layer, which has just started solidification, becomes molten again, and the amount of the outer layer components (C, Cr, Mo, W, V, etc.) mixed in the inner layer components is required. As a result, the inner layer has a high C
And alloying to a higher degree will lead to deterioration of toughness due to deterioration of the material of the inner layer. On the other hand, in order to reduce the amount of the outer layer components mixed into the inner layer, if the temperature of the inner layer of the outer layer is lowered until the unsolidified portion is reduced and then the molten metal of the inner layer is cast, welding failure between the outer layer and the inner layer occurs. It will be.
【０００４】本発明の目的は、高Ｃ材料の外層と低Ｃ材
料の内層を有する複合ロールを遠心力鋳造により作製す
るに際し、外層成分の内層への混入を少なくし、耐摩耗
性にすぐれる外層と強靱性にすぐれる内層を具えた複合
ロールを提供することである。An object of the present invention is to provide a composite roll having an outer layer made of a high C material and an inner layer made of a low C material by centrifugal force casting so that the outer layer components are less mixed into the inner layer and the abrasion resistance is excellent. (EN) Provided is a composite roll having an outer layer and an inner layer having excellent toughness.
【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、本発明の複合ロールは、外層及び内層のＣ％との差
が１.５％以内の中間層を、外層と内層の間に設けるこ
とにより、外層、中間層と内層の各材料の凝固温度が段
階的に大きくなるようにしたものである。なお、凝固温
度とは、特に指定のない限り、凝固を開始する時の温度
を意味するものとする。より具体的には、Ｃ含有量が
２.０〜３.２％（重量％、以下同じ）であるハイス系鋳
鉄材の外層の内面に、外層の外面が凝固した後、内面が
未凝固の段階で、Ｃ：０.８〜１.９％（但し、外層のＣ
％との差が１.５％以下）、Ｓｉ：３.０％以下、Ｍｎ：
２.０％以下、残部実質的にＦｅからなる溶湯を中間層
として鋳込み、少なくとも中間層の内面が未凝固の段階
で、Ｃ：０.２〜０.８％（但し、中間層のＣ％との差が
１.５％以内）、Ｓｉ：０.２〜３.０％、Ｍｎ：０.２〜
２.０％、残部実質的にＦｅからなる鋳鋼材の溶湯を内
層として鋳込むようにしたもので、本発明の複合ロール
は、Ｃ含有量が２.０〜３.２％であるハイス系鋳鉄材の
外層の内面に、Ｃ：０.８〜１.９％、Ｓｉ：３.０％以
下、Ｍｎ：２.０％以下、Ｃｒ：６.０％以下、Ｍｏ：
５.０％以下、Ｗ：５.０％以下、Ｖ：５.０％以下、残
部実質的にＦｅからなる中間層が溶着一体化され、該中
間層の内面に、Ｃ：０.２〜０.８％、Ｓｉ：０.２〜３.
０％、Ｍｎ：０.２〜２.０％、Ｃｒ：１.５％以下、Ｍ
ｏ：１.０％以下、Ｗ：１.０％以下、Ｖ：１.５％以
下、但しＣｒ＋Ｍｏ≧０.３％であり、残部実質的にＦ
ｅからなる鋳鋼材の内層が溶着一体化されている。In order to achieve the above object, in the composite roll of the present invention, an intermediate layer having a difference of C% of the outer layer and the inner layer of 1.5% or less is provided between the outer layer and the inner layer. As a result, the solidification temperature of each material of the outer layer, the intermediate layer and the inner layer is gradually increased. The coagulation temperature means the temperature at the start of coagulation unless otherwise specified. More specifically, after the outer surface of the outer layer is solidified on the inner surface of the outer layer of the high-speed cast iron material having a C content of 2.0 to 3.2% (weight%, the same applies hereinafter), the inner surface is not solidified. At the stage, C: 0.8 to 1.9% (however, C of the outer layer
%, 1.5% or less), Si: 3.0% or less, Mn:
A molten metal consisting of not more than 2.0% and the balance substantially Fe is cast as an intermediate layer, and at least at the stage where the inner surface of the intermediate layer is not solidified, C: 0.2 to 0.8% (however, C% of the intermediate layer is Difference is within 1.5%), Si: 0.2-3.0%, Mn: 0.2-
The melt of a cast steel material consisting of 2.0% and the balance substantially Fe is cast as an inner layer, and the composite roll of the present invention has a C content of 2.0 to 3.2%. On the inner surface of the outer layer of the cast iron material, C: 0.8 to 1.9%, Si: 3.0% or less, Mn: 2.0% or less, Cr: 6.0% or less, Mo:
An intermediate layer consisting of 5.0% or less, W: 5.0% or less, V: 5.0% or less, and the balance substantially consisting of Fe is welded and integrated, and C: 0.2 to 0.2% on the inner surface of the intermediate layer. 0.8%, Si: 0.2 to 3.
0%, Mn: 0.2 to 2.0%, Cr: 1.5% or less, M
o: 1.0% or less, W: 1.0% or less, V: 1.5% or less, but Cr + Mo ≧ 0.3%, and the balance substantially F
The inner layer of the cast steel material consisting of e is welded and integrated.
【０００６】外層のハイス系鋳鉄材として、Ｃ：２.０
〜３.２％、Ｓｉ：０.１〜２.０％、Ｍｎ：０.１〜２.
０％、Ｃｒ：３〜１０％、２×Ｍｏ＋Ｗ：５〜２２％、
Ｖ：３〜８％、残部実質的にＦｅからなる組成を示すこ
とができる。As a high speed cast iron material for the outer layer, C: 2.0
-3.2%, Si: 0.1-2.0%, Mn: 0.1-2.
0%, Cr: 3 to 10%, 2 × Mo + W: 5 to 22%,
V: 3 to 8%, with the balance being substantially Fe.
【０００７】外層と中間層のＣ％の差は１.５％以内で
あるので、両層の凝固温度の差が約１００℃を超えるこ
とはなく、外層の鋳造後、外層の内面の未凝固部分と中
間層の溶湯との温度差を小さくすることができる。ま
た、中間層の厚さは、通常、外層や内層の約１/３以下
であるので、その溶湯の熱量は少ない。従って、外層の
外面が凝固後、内面が未凝固の段階で、中間層の溶湯を
投入しても、外層中、凝固し始めたばかりの部分が中間
層の溶湯によって再溶融することはなく、そのまま凝固
が進行する一方、外層の未凝固部分は中間層溶湯と混じ
り合って、その後の冷却により凝固を開始する。従っ
て、外層成分の中間層への混入は両層の溶着に必要な最
小限度のものとなり、かつ外層と中間層の境界部に引け
巣等が発生することなく良好な溶着が得られる。なお、
中間層の部分は、ロールの使用上、負荷がかからないた
め、材質の劣化により伸び等が低下しても実用上、差し
支えない。また、中間層と内層のＣ％の差も１.５％以
内であり、両層の凝固温度の差が約１００℃を超えるこ
とはないので、外層と中間層の場合と同様、少なくとも
中間層の内面が未凝固の段階で内層を鋳込むとき、中間
層と内層とは良好な溶着が得られる。また、外層成分が
内層にまで混入することは殆んどなく、内層の材質劣化
は防止される。なお、内層を鋳込むとき、中間層は少な
くとも内面が未凝固状態であればよく、中間層全体が未
凝固であってもよいし、中間層の外層側部分が凝固して
いてもよい。外層成分の内層への混入防止の点では、後
者の方がより好ましい。但し、この段階で、外層は凝固
しているべきである。Since the difference in C% between the outer layer and the intermediate layer is within 1.5%, the difference in solidification temperature between both layers does not exceed about 100 ° C., and after the outer layer is cast, the inner surface of the outer layer is not solidified yet. The temperature difference between the part and the molten metal of the intermediate layer can be reduced. Moreover, since the thickness of the intermediate layer is usually about 1/3 or less of that of the outer layer and the inner layer, the amount of heat of the molten metal is small. Therefore, even if the molten metal of the intermediate layer is added at a stage where the outer surface of the outer layer has solidified and the inner surface has not solidified yet, the portion of the outer layer that has just begun to solidify does not remelt due to the molten metal of the intermediate layer. While solidification proceeds, the unsolidified portion of the outer layer mixes with the molten metal of the intermediate layer, and solidification is started by subsequent cooling. Therefore, the mixing of the components of the outer layer into the intermediate layer is the minimum necessary for welding both layers, and good welding can be obtained without generating shrinkage cavities or the like at the boundary between the outer layer and the intermediate layer. In addition,
Since no load is applied to the intermediate layer portion in use of the roll, there is no problem in practical use even if elongation or the like is reduced due to deterioration of the material. Further, the difference in C% between the intermediate layer and the inner layer is also within 1.5%, and the difference in solidification temperature between both layers does not exceed about 100 ° C. Therefore, at least as in the case of the outer layer and the intermediate layer, at least the intermediate layer. When the inner layer is cast when the inner surface of the inner layer is not solidified, good welding is obtained between the intermediate layer and the inner layer. Further, the components of the outer layer are hardly mixed into the inner layer, and the deterioration of the material of the inner layer is prevented. When the inner layer is cast, at least the inner surface of the intermediate layer may be in a non-solidified state, the entire intermediate layer may be unsolidified, or the outer layer side portion of the intermediate layer may be solidified. The latter is more preferable from the viewpoint of preventing the outer layer components from mixing into the inner layer. However, at this stage, the outer layer should be solidified.
【０００８】前記要領にて、外層と内層との間に中間層
を設けることにより、外層の中間層への混入は、良好な
溶着を得るのに最少限の量に抑えることができる。結果
として、内層を鋳込む際、外層成分の内層への混入は極
めて少なくなる。内層を鋳込む際、中間層成分が内層成
分に混入するため、内層にもＣｒ、Ｍｏ、Ｗ、Ｖ等の高
合金元素が含まれる。しかし、これら高合金元素の混入
量は少ないことと、内層のＣ含有量が０.８％以下と少
ないことから、初晶炭化物の生成が少なく、黒鉛鋼やダ
クタイル鋳鉄を鋳込む場合のようにチル化による強靱性
の大幅な劣化は生じない。By providing the intermediate layer between the outer layer and the inner layer in the above manner, the mixing of the outer layer into the intermediate layer can be suppressed to a minimum amount for obtaining good welding. As a result, when the inner layer is cast, the mixture of outer layer components into the inner layer is extremely small. When the inner layer is cast, the intermediate layer component is mixed with the inner layer component, so that the inner layer also contains high alloying elements such as Cr, Mo, W, and V. However, since the mixing amount of these high alloying elements is small and the C content of the inner layer is as low as 0.8% or less, the generation of primary crystal carbides is small, which is the case when casting graphite steel or ductile cast iron. No significant deterioration of toughness due to chilling occurs.
【０００９】内層はＣｒ、Ｍｏ、Ｗ、Ｖ等の高合金元素
の含有量が少ないから、外層の高硬度化のために焼入れ
速度を大きくしても、ベーナイト変態による硬化を抑制
し、パーライト変態を促進することができ、外層熱処理
時における内層の靱性劣化を防止することができる。Since the inner layer contains a small amount of high alloying elements such as Cr, Mo, W, and V, even if the quenching speed is increased to increase the hardness of the outer layer, hardening due to bainite transformation is suppressed and pearlite transformation is performed. Can be promoted, and deterioration of the toughness of the inner layer during heat treatment of the outer layer can be prevented.
【００１０】また、中間層を設けることにより、内層鋳
鉄材のより一層の低Ｃ化が可能となる。例えば、内層の
強靱性をより一層向上させるために、Ｃ含有量を０.４
％以下にすることも可能である。Further, by providing the intermediate layer, it becomes possible to further reduce the carbon content of the inner cast iron material. For example, in order to further improve the toughness of the inner layer, the C content should be 0.4.
It is also possible to set it to% or less.
【００１１】[0011]
【成分限定理由の説明】外層を構成するハイス系鋳鉄材
は、所望の耐摩耗性を具備させるために、その成分限定
理由は次の通りである。 Ｃ：２.０〜３.２％ 耐摩耗性を向上させるために２.０％以上とし、材質の
脆化を防ぐために３.２％以下とする。 Ｓｉ：０.１〜２.０％ ０.１％未満では脱酸作用及び湯流れ性が不足し、２.０
％を超えると焼入れ性が低下し、材質が脆くなるためで
ある。 Ｍｎ：０.１〜２.０％ ＭｎはＳと結合してＭｎＳを形成し、Ｓによる脆化を防
止する。また焼入れ性及び耐摩耗性を向上させる。一
方、あまりに多く含有すると材質が脆くなる。このた
め、含有量は０.１〜２.０％に規定する。 Ｃｒ：３〜１０％ Ｃｒは基地中に固溶し、焼入れ性を向上させると共に、
その一部がＣと結合して炭化物を形成し、耐摩耗性を向
上させる。３％未満ではかかる作用が不足し、一方１０
％を超えるとその作用が飽和すると共に材質が脆くな
る。 ２×Ｍｏ＋Ｗ：５〜２２％ Ｍｏ及びＷはＣと結合してＭ2Ｃ型又はＭ6Ｃ型の炭化物
を形成し、耐摩耗性を向上させると共にその一部は基地
中に固溶し、二次硬化に寄与する。ＭｏはＷの２倍の効
果があるため、成分範囲はＭｏ含有量の２倍とＷ含有量
との和(２Ｍｏ＋Ｗ)によって規定する。２Ｍｏ＋Ｗが５
％未満ではかかる作用が少なく、一方、２２％を超える
と炭化物量が多くなり、靱性が低下すると共に、基地中
に溶け込んだＭｏやＷによって残留オーステナイトが安
定化し、高硬度が得られ難い。 Ｖ：３〜８％ ＶはＣと結合し高硬度のＭＣ型炭化物を形成し、耐摩耗
性を向上させる。３％未満では炭化物量が少なく、耐摩
耗性が不足する。一方、８％を超えると偏析の防止が困
難になる。外層を構成するハイス系鋳鉄材は、上記合金
成分の他、残部実質的にＦｅで形成されるが、不純物元
素であるＳ、Ｐは材質を脆くするため、できるだけ少な
い方がよく、両元素とも０.１％以下にすることが望ま
しい。[Explanation of Reasons for Limiting Components] The reasons for limiting the components of the high speed cast iron material constituting the outer layer are as follows in order to provide desired wear resistance. C: 2.0 to 3.2% It is set to 2.0% or more to improve wear resistance, and 3.2% or less to prevent embrittlement of the material. Si: 0.1-2.0% If less than 0.1%, the deoxidizing action and the flowability of the molten metal are insufficient, so
This is because the hardenability deteriorates and the material becomes brittle when the content exceeds%. Mn: 0.1-2.0% Mn combines with S to form MnS and prevents embrittlement due to S. It also improves hardenability and wear resistance. On the other hand, if the content is too large, the material becomes brittle. Therefore, the content is specified to be 0.1 to 2.0%. Cr: 3 to 10% Cr dissolves in the matrix to improve hardenability and
A part of it combines with C to form a carbide, which improves wear resistance. If it is less than 3%, the effect is insufficient, while 10
If it exceeds%, the action is saturated and the material becomes brittle. 2 × Mo + W: 5 to 22% Mo and W combine with C to form an M 2 C type or M 6 C type carbide, which improves wear resistance and part of which dissolves in the matrix. Contributes to secondary curing. Since Mo is twice as effective as W, the component range is defined by the sum of twice the Mo content and the W content (2Mo + W). 2Mo + W is 5
If it is less than%, such an effect is small, while if it exceeds 22%, the amount of carbide increases and the toughness decreases, and the retained austenite is stabilized by Mo and W dissolved in the matrix, and it is difficult to obtain high hardness. V: 3-8% V combines with C to form a high hardness MC type carbide and improves wear resistance. If it is less than 3%, the amount of carbide is small and the wear resistance is insufficient. On the other hand, if it exceeds 8%, it becomes difficult to prevent segregation. The high-speed cast iron material constituting the outer layer is formed of Fe as the balance in addition to the above alloy components, but S and P, which are impurity elements, make the material brittle, so it is preferable that the content be as small as possible. It is desirable to set it to 0.1% or less.
【００１２】中間層を構成する材料は、外層の合金成分
が内層に混入するのを防止するため、その成分限定理由
は次の通りである。 Ｃ：０.８〜１.９％ 中間層の凝固点が、外層と内層の中間の凝固点をもつよ
うに設定するためである。 Ｓｉ：３.０％以下、Ｍｎ：２.０％以下 ＳｉとＭｎは、外層と内層の中間の成分範囲にすること
が好ましいためである。なお、内層に近い成分範囲に設
定することが好ましい。中間層の鋳造時の溶湯成分は、
上記の通りＣ、Ｓｉ、Ｍｎを含有し、残部は実質的にＦ
ｅであり、Ｃについては、外層溶湯のＣ％との差が１.
５％以内となるようにする。なお、鋳造後の中間層は、
Ｃｒ：６.０％以下、Ｍｏ：５.０％以下、Ｗ：５.０％
以下、Ｖ：５.０％以下をさらに含んでいる。その理由
は、Ｃｒ、Ｍｏ、Ｗ及びＶは、鋳造時に外層成分の比率
に応じて不可避的に中間層に混入するためであり、外層
から中間層への混入量をこの程度に抑えることにより、
外層成分の内層への混入量を、内層材質を劣化させない
程度に抑えることができる。The material constituting the intermediate layer prevents the alloy components of the outer layer from mixing into the inner layer, and the reasons for limiting the components are as follows. C: 0.8 to 1.9% This is because the freezing point of the intermediate layer is set to have an intermediate freezing point between the outer layer and the inner layer. Si: 3.0% or less, Mn: 2.0% or less It is preferable that Si and Mn are in a range of components between the outer layer and the inner layer. In addition, it is preferable to set the component range close to the inner layer. The molten metal composition during casting of the intermediate layer is
As described above, it contains C, Si and Mn, and the balance is substantially F.
e, and for C, the difference from the C% of the outer layer molten metal is 1.
Try to stay within 5%. The intermediate layer after casting is
Cr: 6.0% or less, Mo: 5.0% or less, W: 5.0%
Hereinafter, V: 5.0% or less is further included. The reason is that Cr, Mo, W and V are unavoidably mixed in the intermediate layer according to the ratio of the components of the outer layer at the time of casting, and by suppressing the mixing amount from the outer layer to the intermediate layer to this extent,
The amount of the outer layer component mixed into the inner layer can be suppressed to such an extent that the material of the inner layer is not deteriorated.
【００１３】内層を構成する鋳鉄材は、所望の強靱性を
具備させるために、その成分限定理由は次の通りであ
る。 Ｃ：０.２〜０.８％ 靱性向上のために、その含有量は低い程良いが、０.２
％以下では凝固点が高くなりすぎる。一方、０.８％を
超えると鋳造時及び高温熱処理時にネット状炭化物が析
出し、靱性が低下する。このため、０.２〜０.８％に規
定するが、靱性向上の観点からは０.２〜０.４％がより
好ましい。 Ｓｉ：０.２〜３.０％ 溶湯の凝固点を下げ、かつ湯流れ性を向上させると共に
フェライトの析出を促進する作用がある。０.２％以下
では、かかる作用が不足し、好ましくは１.０％以上含
有させるのがよい。一方、３.０％を超えると材質が脆
くなる。 Ｍｎ：０.２〜２.０％ Ｓと結合し、ＭｎＳを形成し、Ｓによる脆化を防止する
作用がある。０.２％以下ではかかる作用が不足し、一
方、２.０％を超えると材質が脆くなる。内層の鋳造時
の溶湯成分は、上記の通りＣ、Ｓｉ、Ｍｎを含有し、残
部は実質的にＦｅであり、Ｃについては、中間層溶湯の
Ｃ％との差が１.５％以内となるようにする。なお、鋳
造後の内層は、Ｃｒ：１.５％以下、Ｍｏ：１.０％以
下、Ｗ：１.０％以下、Ｖ：１.５％以下を含有してい
る。Ｃｒ、Ｍｏ、Ｗ及びＶは、鋳造時に中間層成分の比
率に応じて内層に不可避的に混入するためであり、内層
の材質を劣化させないために、この程度以下にしておく
とよい。但し、Ｃｒ、Ｍｏの少量の含有は、内層材の靱
性を向上させるため、Ｃｒ＋Ｍｏの下限値を０.３％以
上に設定した。The reasons for limiting the components of the cast iron material constituting the inner layer are as follows, in order to have desired toughness. C: 0.2 to 0.8% In order to improve toughness, the lower the content, the better, but 0.2
% Or less, the freezing point becomes too high. On the other hand, if it exceeds 0.8%, net carbides are precipitated during casting and during high temperature heat treatment, and the toughness decreases. Therefore, it is specified to be 0.2 to 0.8%, but from the viewpoint of improving the toughness, 0.2 to 0.4% is more preferable. Si: 0.2 to 3.0% It has the effects of lowering the freezing point of the molten metal, improving the flowability of the molten metal, and promoting the precipitation of ferrite. If the content is 0.2% or less, such action is insufficient, and it is preferable that the content be 1.0% or more. On the other hand, if it exceeds 3.0%, the material becomes brittle. Mn: 0.2-2.0% Combines with S to form MnS and has an action of preventing embrittlement due to S. If it is less than 0.2%, such action is insufficient, while if it exceeds 2.0%, the material becomes brittle. The molten metal component at the time of casting of the inner layer contains C, Si, and Mn as described above, and the balance is substantially Fe. Regarding C, the difference from the C% of the intermediate layer molten metal is within 1.5%. To be The inner layer after casting contains Cr: 1.5% or less, Mo: 1.0% or less, W: 1.0% or less, V: 1.5% or less. This is because Cr, Mo, W, and V are inevitably mixed in the inner layer in accordance with the ratio of the components of the intermediate layer during casting, and it is preferable to keep the amount of Cr, Mo, W, and V in this range or less in order not to deteriorate the material of the inner layer. However, since the inclusion of a small amount of Cr and Mo improves the toughness of the inner layer material, the lower limit of Cr + Mo is set to 0.3% or more.
【００１４】[0014]
【発明の実施の形態】本発明の鉄鋼圧延用複合ロール
は、金型遠心力鋳造法により作製することができ、外層
用溶湯を鋳込み、外層の外面が凝固した後、内面が未凝
固の段階で、中間層用溶湯を鋳込み、中間層の少なくと
も内面が未凝固の段階で内層用溶湯を鋳込む。遠心力鋳
造法には、円筒状金型の回転軸が水平方向の横型、斜め
方向の傾斜型、鉛直方向の縦型の各種の方法を適用する
ことができる。BEST MODE FOR CARRYING OUT THE INVENTION The composite roll for steel rolling of the present invention can be produced by a die centrifugal force casting method, in which molten metal for the outer layer is cast, the outer surface of the outer layer is solidified, and then the inner surface is not solidified. Then, the molten metal for the intermediate layer is cast, and the molten metal for the internal layer is cast when at least the inner surface of the intermediate layer is not solidified. As the centrifugal casting method, various methods such as a horizontal type in which the rotation axis of a cylindrical mold is horizontal, an inclined type in an oblique direction, and a vertical type in a vertical direction can be applied.
【００１５】本発明の複合ロールは、鋳造後、外層に所
定の熱処理が施される。即ち、オーステナイト化温度か
ら６５０〜４００℃までの温度域を１００℃／Ｈｒ以上
の冷却速度で急冷し、良好な焼入れ組織を得た後、５０
０〜６００℃の温度で１回乃至数回の焼戻しを行なう。
本発明の外層材は、オーステナイト温度への加熱により
基地中に固溶したＭｏ、Ｗ、Ｖ等が焼戻しによって微細
炭化物として析出し、焼戻し２次硬化現象を生じるた
め、高温硬度にすぐれる。After casting, the composite roll of the present invention is subjected to a predetermined heat treatment on the outer layer. That is, after quenching the temperature range from the austenitizing temperature to 650 to 400 ° C. at a cooling rate of 100 ° C./Hr or more to obtain a good quenched structure, 50
Tempering is performed once to several times at a temperature of 0 to 600 ° C.
The outer layer material of the present invention is excellent in high temperature hardness because Mo, W, V, etc. solid-soluted in the matrix by heating to the austenite temperature are precipitated as fine carbides by tempering and a secondary hardening phenomenon of tempering occurs.
【００１６】外層の加熱方法として、ロール全体を加熱
炉に入れて加熱する方法、外層外周面の周りに誘導加熱
コイルや多数のガスバーナを配置しておき、これらによ
って外層のみを急速加熱する方法がある。As a method of heating the outer layer, there are a method of heating the entire roll in a heating furnace and a method of arranging an induction heating coil and a number of gas burners around the outer peripheral surface of the outer layer and rapidly heating only the outer layer. is there.
【００１７】[0017]
【実施例】次に、本発明の具体的実施例を掲げる。内径
８５１mm、長さ２５５０mmの横型遠心力鋳造用金型に、
外層用の溶湯を遠心力鋳造した。金型回転数はＧナンバ
ーで１４０、外層の鋳込み温度は１４４０℃、鋳込み厚
さは１００mmである。外層の内面温度が１２９０℃にな
ったとき、その内面に、中間層用の溶湯を遠心力鋳造し
た。中間層用溶湯の鋳込み開始時の温度は１５５５℃で
あり、鋳込み厚さは３０mmである。なお、中間層用溶湯
の投入時、外層は外面が凝固しているが、内面は未凝固
状態である。外層内面の未凝固部分は、中間層の溶湯と
混合され、中間層用溶湯投入時での混合溶湯の温度は、
計算上で約１４２０℃である。次に、中間層の内面温度
が１３７０℃になったとき、その内面に、内層用の溶湯
を遠心力鋳造した。内層用溶湯の鋳込み温度は１５８５
℃であり、鋳込み厚さは１００mmである。なお、内層用
溶湯の投入時、中間層は、外層側部分が一部凝固してお
り、内面は未凝固状態である。外層、中間層及び内層の
鋳造用溶湯の組成を表１に示す。外層、中間層及び内層
の材料の液相線と固相線の温度を表１に併せて示す。な
お、液相線は凝固開始温度、固相線は凝固終了温度を意
味する。EXAMPLES Next, specific examples of the present invention will be given. For horizontal centrifugal force casting mold with inner diameter 851mm and length 2550mm,
The molten metal for the outer layer was centrifugally cast. The number of rotations of the mold is 140 in G number, the casting temperature of the outer layer is 1440 ° C., and the casting thickness is 100 mm. When the inner surface temperature of the outer layer reached 1290 ° C., the molten metal for the intermediate layer was centrifugally cast on the inner surface of the outer layer. The temperature at the start of casting the molten metal for the intermediate layer is 1555 ° C., and the casting thickness is 30 mm. When the molten metal for the intermediate layer is charged, the outer surface of the outer layer is solidified, but the inner surface is unsolidified. The unsolidified portion of the inner surface of the outer layer is mixed with the molten metal of the intermediate layer, and the temperature of the mixed molten metal when the molten metal for the intermediate layer is charged is
The calculated temperature is about 1420 ° C. Next, when the inner surface temperature of the intermediate layer reached 1370 ° C., the inner layer melt was centrifugally cast on the inner surface. The casting temperature of the molten metal for the inner layer is 1585
C. and the casting thickness is 100 mm. When the molten metal for the inner layer is charged, the outer layer side portion of the intermediate layer is partially solidified, and the inner surface is unsolidified. Table 1 shows the composition of the molten metal for casting of the outer layer, the intermediate layer and the inner layer. Table 1 also shows the liquidus and solidus temperatures of the materials of the outer layer, the intermediate layer and the inner layer. The liquidus line means the solidification start temperature and the solidus line means the solidification end temperature.
【００１８】[0018]
【表１】 [Table 1]
【００１９】表１に示す成分の溶湯を鋳造後、得られた
複合ロールの外層、中間層及び内層の化学成分組成を表
２に示す。表２に示されるように、鋳造後の内層のＣ含
有量は０.６４％と少なく、また、Ｃｒ、Ｍｏ、Ｗ、Ｖ
の高合金元素の含有量も、夫々、０.４５％、０.３２
％、０.２１％、０.２８％と少ないことがわかる。Table 2 shows the chemical composition of the outer layer, the intermediate layer and the inner layer of the composite roll obtained after casting the molten metal having the components shown in Table 1. As shown in Table 2, the C content of the inner layer after casting was as low as 0.64%, and Cr, Mo, W, V
The contents of high alloying elements of 0.45% and 0.32 respectively
%, 0.21%, 0.28%.
【００２０】[0020]
【表２】 [Table 2]
【００２１】次に、この複合ロールを１０００℃で３時
間保持後、強制空冷により焼入れし、その後、５５０℃
で１０時間保持する焼戻し処理を３回繰り返す熱処理を
行なった。まず、得られた複合ロールに超音波探傷試験
を行なったところ、外層、中間層及び内層は完全に溶着
接合されていることが確認された。次に、外層の硬度測
定を行なったところ、ショア硬度で８２〜８４であり、
高硬度を有しており、耐摩耗性にすぐれている。さら
に、内層から試験片を採取し、引張試験を行なった。そ
の結果、引張強度８４０MPa、伸び２.３％であり、内層
は強靱性にすぐれることが確かめられた。内層の顕微鏡
組織を調べたところ、フェライトとパーライトからなる
良好な組織であり、ベーナイトは認められなかった。Next, after holding this composite roll at 1000 ° C. for 3 hours, it is quenched by forced air cooling, and then 550 ° C.
A heat treatment was performed in which the tempering treatment for 10 hours was repeated 3 times. First, an ultrasonic flaw detection test was performed on the obtained composite roll, and it was confirmed that the outer layer, the intermediate layer and the inner layer were completely welded and joined. Next, when the hardness of the outer layer was measured, the Shore hardness was 82 to 84,
Has high hardness and excellent wear resistance. Further, a test piece was taken from the inner layer and a tensile test was conducted. As a result, it was confirmed that the tensile strength was 840 MPa and the elongation was 2.3%, and the inner layer had excellent toughness. When the microscopic structure of the inner layer was examined, it was a good structure composed of ferrite and pearlite, and bainite was not observed.
【００２２】[0022]
【発明の効果】本発明によれば、外層、中間層及び内層
との溶着状態が良好であり、かつ、外層は所定の耐摩耗
性を具備し、内層は所定の強靱性を具備することができ
るから、高品質の鉄鋼圧延用ロールを製造することがで
きる。According to the present invention, the welded state with the outer layer, the intermediate layer and the inner layer is good, the outer layer has a predetermined wear resistance, and the inner layer has a predetermined toughness. Therefore, a high-quality steel rolling roll can be manufactured.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２２Ｃ 38/24 Ｃ２２Ｃ 38/24 (72)発明者 林 和彦 兵庫県尼崎市西向島町64番地 株式会社ク ボタ尼崎工場内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Internal reference number FI Technical indication location C22C 38/24 C22C 38/24 (72) Inventor Kazuhiko Hayashi 64 Nishimukojima-cho, Amagasaki-shi, Hyogo Co., Ltd. Kubota Amagasaki Factory
Claims (4)
下同じ)であるハイス系鋳鉄材の外層の内面に、Ｃ：０.
８〜１.９％、Ｓｉ：３.０％以下、Ｍｎ：２.０％以
下、Ｃｒ：６.０％以下、Ｍｏ：５.０％以下、Ｗ：５.
０％以下、Ｖ：５.０％以下、残部実質的にＦｅからな
る中間層が溶着一体化され、該中間層の内面に、Ｃ：
０.２〜０.８％、Ｓｉ：０.２〜３.０％、Ｍｎ：０.２
〜２.０％、Ｃｒ：１.５％以下、Ｍｏ：１.０％以下、
Ｗ：１.０％以下、Ｖ：１.５％以下、但しＣｒ＋Ｍｏ≧
０.３％であり、残部実質的にＦｅからなる鋳鋼材の内
層が溶着一体化されていることを特徴とする圧延用複合
ロール。1. The inner surface of the outer layer of the high-speed cast iron material having a C content of 2.0 to 3.2% (weight%, the same applies hereinafter) has a C content of 0.0.
8 to 1.9%, Si: 3.0% or less, Mn: 2.0% or less, Cr: 6.0% or less, Mo: 5.0% or less, W: 5.0% or less.
An intermediate layer consisting of 0% or less, V: 5.0% or less and the balance substantially consisting of Fe is welded and integrated, and C: is formed on the inner surface of the intermediate layer.
0.2-0.8%, Si: 0.2-3.0%, Mn: 0.2
~ 2.0%, Cr: 1.5% or less, Mo: 1.0% or less,
W: 1.0% or less, V: 1.5% or less, but Cr + Mo ≧
The composite roll for rolling is characterized in that the inner layer of the cast steel material is 0.3%, and the balance substantially consists of Fe, and is fused and integrated.
２.０〜３.２％、Ｓｉ：０.１〜２.０％、Ｍｎ：０.１
〜２.０％、Ｃｒ：３〜１０％、２×Ｍｏ＋Ｗ：５〜２
２％、Ｖ：３〜８％、残部実質的にＦｅからなる請求項
１に記載のロール。2. The high-speed cast iron material constituting the outer layer is C:
2.0-3.2%, Si: 0.1-2.0%, Mn: 0.1
~ 2.0%, Cr: 3-10%, 2xMo + W: 5-2
The roll according to claim 1, wherein 2%, V: 3 to 8%, and the balance substantially Fe.
内層を順次鋳込んで圧延用複合ロールを製造する方法で
あって、Ｃ：２.０〜３.２％を含有するハイス系鋳鉄材
の溶湯を外層として鋳込む工程、外層の外面が凝固した
後、内面が未凝固の段階で、Ｃ：０.８〜１.９％(但
し、外層のＣ％との差が１.５％以下)、Ｓｉ：３.０％
以下、Ｍｎ：２.０％以下、残部実質的にＦｅからなる
溶湯を中間層として鋳込む工程、少なくとも中間層の内
面が未凝固の段階で、Ｃ：０.２〜０.８％(但し、中間
層のＣ％との差が１.５％以内)、Ｓｉ：０.２〜３.０
％、Ｍｎ：０.２〜２.０％、残部実質的にＦｅからなる
鋳鋼材の溶湯を内層として鋳込む工程、を有することを
特徴とする圧延用複合ロールの製造方法。3. A method for producing a composite roll for rolling by sequentially casting an outer layer, an intermediate layer and an inner layer by a centrifugal casting method, which is a high-speed cast iron containing C: 2.0 to 3.2%. In the step of casting the molten metal of the material as the outer layer, after the outer surface of the outer layer is solidified and the inner surface is not solidified, C: 0.8 to 1.9% (however, the difference from the outer layer C% is 1.5%). % Or less), Si: 3.0%
Hereinafter, a step of casting a molten metal consisting of Mn: 2.0% or less and the balance substantially consisting of Fe as an intermediate layer, at a stage where at least the inner surface of the intermediate layer is unsolidified, C: 0.2 to 0.8% (however, , The difference from the C% of the intermediate layer is within 1.5%), Si: 0.2 to 3.0
%, Mn: 0.2-2.0%, and the remainder being a step of casting a molten metal of a cast steel material consisting essentially of Fe as an inner layer.
は、Ｃ：２.０〜３.２％、Ｓｉ：０.１〜２.０％、Ｍ
ｎ：０.１〜２.０％、Ｃｒ：３〜１０％、２×Ｍｏ＋
Ｗ：５〜２２％、Ｖ：３〜８％、残部実質的にＦｅであ
る請求項３に記載の方法。4. The molten metal of the high speed cast iron material constituting the outer layer is C: 2.0 to 3.2%, Si: 0.1 to 2.0%, M
n: 0.1 to 2.0%, Cr: 3 to 10%, 2 × Mo +
The method according to claim 3, wherein W: 5 to 22%, V: 3 to 8%, and the balance being substantially Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1851796A JPH09209071A (en) | 1996-02-05 | 1996-02-05 | Composite roll for rolling and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1851796A JPH09209071A (en) | 1996-02-05 | 1996-02-05 | Composite roll for rolling and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09209071A true JPH09209071A (en) | 1997-08-12 |
Family
ID=11973829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1851796A Pending JPH09209071A (en) | 1996-02-05 | 1996-02-05 | Composite roll for rolling and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09209071A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007144442A (en) * | 2005-11-25 | 2007-06-14 | Hitachi Metals Ltd | Composite roll for rolling |
| WO2007077637A1 (en) | 2005-12-28 | 2007-07-12 | Hitachi Metals, Ltd. | Centrifugally cast composite roll |
| CN107243618A (en) * | 2017-05-15 | 2017-10-13 | 唐山亿联盛轧辊有限公司 | A kind of production method of compound high speed steel roll |
-
1996
- 1996-02-05 JP JP1851796A patent/JPH09209071A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007144442A (en) * | 2005-11-25 | 2007-06-14 | Hitachi Metals Ltd | Composite roll for rolling |
| WO2007077637A1 (en) | 2005-12-28 | 2007-07-12 | Hitachi Metals, Ltd. | Centrifugally cast composite roll |
| US8308622B2 (en) | 2005-12-28 | 2012-11-13 | Hitachi Metals, Ltd. | Centrifugally cast composit roll |
| CN107243618A (en) * | 2017-05-15 | 2017-10-13 | 唐山亿联盛轧辊有限公司 | A kind of production method of compound high speed steel roll |
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