JPH1068041A - High-speed steel series cast iron material containing graphite - Google Patents
High-speed steel series cast iron material containing graphiteInfo
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- JPH1068041A JPH1068041A JP22827196A JP22827196A JPH1068041A JP H1068041 A JPH1068041 A JP H1068041A JP 22827196 A JP22827196 A JP 22827196A JP 22827196 A JP22827196 A JP 22827196A JP H1068041 A JPH1068041 A JP H1068041A
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- Prior art keywords
- cast iron
- content
- graphite
- iron material
- casting
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、圧延ロール用、特
に複合ロールの外層用として得に好適な黒鉛晶出ハイス
系鋳鉄材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphite crystallized high-speed cast iron material which is suitable for use in a rolling roll, particularly for an outer layer of a composite roll.
【０００２】[0002]
【従来の技術】圧延用複合ロールの外層材として、黒鉛
晶出ハイス系鋳鉄材がある(特開平６−２５６８８９)。
この鋳鉄材は、黒鉛と複合炭化物(ＭＣ型、Ｍ7Ｃ3型、
Ｍ6Ｃ型、Ｍ2Ｃ型等)が晶出した組織を有しており、黒
鉛の作用による低摩擦係数及び良好な耐焼付性を具備す
ると共に、炭化物の存在による高耐摩耗性を具備してい
る。2. Description of the Related Art As an outer layer material of a composite roll for rolling, there is a graphite crystallized high-speed cast iron material (JP-A-6-256889).
This cast iron material is made of graphite and composite carbide (MC type, M 7 C 3 type,
M 6 C-type, has a structure in which M 2 C type, etc.) is crystallized out, together comprise a low friction coefficient and good seizure resistance due to the action of graphite, provided with a high wear resistance due to the presence of the carbide doing.
【０００３】[0003]
【発明が解決しようとする課題】鉄鋼圧延用複合ロール
の外層は、まず耐摩耗性が良好であらねばならず、その
ために、Ｃｒ、Ｍｏ、Ｗ、Ｖ、Ｎｂ等の炭化物形成元素
を所定量含有させる必要がある。しかし、これら炭化物
形成元素の含有は、一方で黒鉛化を阻害する。黒鉛の晶
出を促進するにはＳｉ含有量を増やすことが有効である
が、Ｓｉ量を増やすと、鋳造後の冷却時に割れが生じや
すくなる問題があった。本発明の目的は、Ｓｉの含有量
を増やすことなく、黒鉛を晶出し易くすることである。The outer layer of the composite roll for steel rolling must first have good wear resistance. For this purpose, a predetermined amount of carbide-forming elements such as Cr, Mo, W, V, and Nb is required. Must be included. However, the inclusion of these carbide-forming elements, on the other hand, inhibits graphitization. Increasing the Si content is effective in promoting crystallization of graphite, but increasing the Si content has a problem that cracks are likely to occur during cooling after casting. An object of the present invention is to facilitate crystallization of graphite without increasing the content of Si.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するた
め、本発明のハイス系鋳鉄材は、ＯとＮの含有量を低く
抑えることにより黒鉛の晶出を容易にしたものであり、
具体的には、鋳鉄溶湯の脱酸処理及び脱窒処理を行なう
ことにより、鋳鉄材に含まれるＯとＮを、夫々、Ｏ：１
００ppm以下、Ｎ：３００ppm以下となるようにした。よ
り具体的には、本発明の黒鉛晶出ハイス系鋳鉄材は、重
量％にて、Ｃ：１.８〜３.６％、Ｓｉ：１.０〜３.５
％、Ｍｎ：０.１〜２.０％、Ｎｉ：０.５〜１０.０％、
Ｃｒ：１.５〜１０.０％、Ｍｏ：０.１〜１０.０％、
Ｗ：０.１〜１０.０％、Ｖ、Ｎｂの一種又は二種を合計
量で１.０〜１０.０％含有し、Ｏ：１００ppm以下、
Ｎ：３００ppm以下であり、残部実質的にＦｅからな
る。In order to achieve the above object, the high-speed cast iron material of the present invention facilitates the crystallization of graphite by keeping the contents of O and N low.
Specifically, by performing deoxidation treatment and denitrification treatment of the cast iron melt, O and N contained in the cast iron material are respectively reduced to O: 1.
00 ppm or less, N: 300 ppm or less. More specifically, the graphite-crystallized high-speed cast iron material of the present invention has a C content of 1.8 to 3.6% and a Si content of 1.0 to 3.5% by weight.
%, Mn: 0.1 to 2.0%, Ni: 0.5 to 10.0%,
Cr: 1.5 to 10.0%, Mo: 0.1 to 10.0%,
W: 0.1 to 10.0%, containing one or two of V and Nb in a total amount of 1.0 to 10.0%, O: 100 ppm or less,
N: 300 ppm or less, with the balance substantially consisting of Fe.
【０００５】本発明の鋳鉄材は必要に応じて、Ｃｏ：
０.５〜１０.０％を含有することができる。また、必要
に応じて、Ａｌ：０.０１〜０.５０％、Ｔｉ：０.０１
〜２.０％、Ｚｒ：０.０１〜２.０％の内の一種又は二
種以上を含有することができる。さらにまた、必要に応
じて、Ｂ：０.０１〜０.５０％を含有することができ
る。[0005] The cast iron material of the present invention may optionally contain Co:
0.5 to 10.0% can be contained. Further, if necessary, Al: 0.01 to 0.50%, Ti: 0.01
２2.0%, and one or more of Zr: 0.01-2.0%. Furthermore, if necessary, B: 0.01 to 0.50% can be contained.
【０００６】ＯとＮは、炭化物を安定化させる作用を有
するから、その含有量を少なくすることによって必要以
上の炭化物の生成が抑制され、黒鉛の晶出・析出が促進
されると考えられる。また、ＯとＮは非金属介在物とな
って材料の強靱性を劣化し、鋳造割れを起こし易くする
傾向にある。その含有量を少なくすることにより、鋳造
割れの発生を防止できる。Since O and N have a function of stabilizing carbides, it is considered that by reducing the content thereof, generation of unnecessary carbides is suppressed, and crystallization and precipitation of graphite are promoted. In addition, O and N tend to become nonmetallic inclusions, deteriorating the toughness of the material, and causing casting cracks. By reducing the content, the occurrence of casting cracks can be prevented.
【０００７】[0007]
Ｃ：１.８〜３.６％ Ｃは、主としてＦｅ及びＣｒと結合してＭ7Ｃ3型の高硬
度複合炭化物を形成すると共に、Ｍｏ、Ｖ、Ｎｂ、Ｗな
どと結合して、ＭＣ型、Ｍ6Ｃ型、Ｍ2Ｃ型等の高硬度複
合炭化物をも形成する。また、後述の黒鉛化促進元素で
あるＳｉの作用により、また熱処理により微細な黒鉛と
なって組織中に晶出・析出する。１.８％に満たないと
炭化物量が減少すると共に好適な黒鉛量が得られなくな
り、一方含有量が３.６％を超えると炭化物量及び黒鉛
量が過多となって材質が脆くなるめ、Ｃの含有量は１.
８〜３.６％に規定する。C: 1.8 to 3.6% C mainly combines with Fe and Cr to form an M 7 C 3 type high-hardness composite carbide, and combines with Mo, V, Nb, W, etc. to form MC. A high hardness composite carbide such as a mold, M 6 C type, M 2 C type, etc. is also formed. Further, by the action of Si, which is a graphitization promoting element to be described later, and by heat treatment, fine graphite is crystallized and precipitated in the structure. If it is less than 1.8%, the amount of carbides decreases and a suitable amount of graphite cannot be obtained. On the other hand, if the content exceeds 3.6%, the amount of carbides and graphite becomes excessive and the material becomes brittle, The content of C is 1.
8 to 3.6%.
【０００８】Ｓｉ：１.０〜３.５％ Ｓｉは、湯流れ性の確保及び黒鉛を晶出・析出させるた
めに必要な元素である。含有量が１.０％に満たない
と、所望の効果が得られない。一方、３.５％を超える
と黒鉛量が過多となり、黒鉛を起点とする摩耗が著しく
なる虞れがあり、さらに、鋳造割れを生じ易くなる。こ
のため、含有量は１.０〜３.５％に規定する。なお、黒
鉛の晶出を促進するには、鋳込み前のＳｉ量を上記成分
範囲よりも少なめにしておいて、鋳込み時に接種を行な
い、最終製品の成分で上記範囲内に調整するのが好まし
い。Si: 1.0-3.5% Si is an element necessary for securing the flowability of the molten metal and for crystallizing and precipitating graphite. If the content is less than 1.0%, the desired effect cannot be obtained. On the other hand, if it exceeds 3.5%, the amount of graphite becomes excessive, and there is a possibility that abrasion starting from graphite becomes remarkable, and casting cracks are more likely to occur. For this reason, the content is specified to be 1.0 to 3.5%. In order to promote the crystallization of graphite, it is preferable that the amount of Si before casting is set to be smaller than the above component range, inoculation is performed at the time of casting, and the content is adjusted within the above range with the components of the final product.
【０００９】Ｍｎ：０.１〜２.０％ Ｍｎは、硬化能を増す働きがある。また、Ｓと結合して
ＭｎＳを生成し、Ｓによる脆化を防止するのに有効な元
素である。一方、含有量が多くなりすぎると靱性の低下
を招くため、含有量は０.１〜２.０％に規定する。Mn: 0.1 to 2.0% Mn has a function of increasing the curing ability. Further, it is an element effective for forming MnS by combining with S and preventing embrittlement due to S. On the other hand, if the content is too large, the toughness is reduced. Therefore, the content is specified to be 0.1 to 2.0%.
【００１０】Ｎｉ：０.５〜１０.０％ Ｎｉは、基地組織の改良と黒鉛を晶出・析出させる目的
で添加する。含有量が０.５％に満たないとその効果は
少ない。一方、１０.０％を超えると、Ｓｉの場合と同
様、黒鉛が過多となり、また、残留オーステナイトが増
加して、後の熱処理によって強靭組織を得ることが難し
くなり、耐摩耗性が劣化する。このため、含有量は、
０.５〜１０.０％に規定する。Ni: 0.5 to 10.0% Ni is added for the purpose of improving the matrix structure and crystallizing and precipitating graphite. If the content is less than 0.5%, the effect is small. On the other hand, if it exceeds 10.0%, as in the case of Si, graphite becomes excessive, and retained austenite increases, so that it becomes difficult to obtain a tough structure by a subsequent heat treatment, and wear resistance deteriorates. Therefore, the content is
It is regulated to 0.5 to 10.0%.
【００１１】Ｃｒ：１.５〜１０.０％ Ｃｒは、Ｆｅ、Ｍｏ、Ｎｂ、Ｗなどと共にＣと結合し
て、高硬度複合炭化物を形成し高温における耐摩耗性の
向上に寄与する。含有量が１.５％に満たないとその効
果が少なく、一方１０.０％を超えると好適な黒鉛量を
得ることが困難となる。このため、含有量は１.５〜１
０.０％に規定する。Cr: 1.5 to 10.0% Cr combines with C together with Fe, Mo, Nb, W, etc. to form a high-hardness composite carbide and contributes to improvement of wear resistance at high temperatures. If the content is less than 1.5%, the effect is small, while if it exceeds 10.0%, it becomes difficult to obtain a suitable amount of graphite. Therefore, the content is 1.5 to 1
It is regulated to 0.0%.
【００１２】Ｍｏ：０.１〜１０.０％ Ｍｏは、Ｆｅ、Ｃｒ、Ｎｂ、Ｗと共にＣと結合して、主
としてＭ7Ｃ型、Ｍ6Ｃ型、Ｍ2Ｃ型の複合炭化物を形成
し、常温及び高温硬度を高めて耐摩耗性の向上に寄与す
る。このため、少なくとも０.１％以上含有させる。一
方、あまりに多く含有すると、所定の黒鉛量を得ること
が困難になる。このため、上限は１０.０％に規定す
る。Mo: 0.1 to 10.0% Mo combines with C together with Fe, Cr, Nb and W to form a composite carbide mainly of M 7 C type, M 6 C type and M 2 C type. In addition, the hardness at normal and high temperatures is increased to contribute to the improvement of wear resistance. Therefore, the content is at least 0.1% or more. On the other hand, if the content is too large, it becomes difficult to obtain a predetermined amount of graphite. For this reason, the upper limit is defined as 10.0%.
【００１３】Ｗ：０.１〜１０.０％ Ｗも同様に、Ｆｅ、Ｃｒ、Ｍｏ、Ｎｂと共にＣと結合し
て、複合炭化物を形成し、常温及び高温硬度を高めて耐
摩耗性の向上に寄与する。このため、少なくとも０.１
％以上含有させる。一方、あまりに多く含有すると、所
定の黒鉛量を得ることが困難になる。このため。、上限
は１０.０％に規定する。W: 0.1 to 10.0% W also combines with C together with Fe, Cr, Mo, and Nb to form a complex carbide, and increases the hardness at ordinary and high temperatures to improve wear resistance. To contribute. Therefore, at least 0.1
% Or more. On the other hand, if the content is too large, it becomes difficult to obtain a predetermined amount of graphite. For this reason. , The upper limit is defined as 10.0%.
【００１４】Ｖ、Ｎｂ：一種又は二種を合計量で１.０
〜１０.０％ ＶとＮｂは、Ｆｅ、Ｃｒ、Ｍｏ、Ｗと共にＣと結合し
て、主としてＭＣ型の炭化物を形成し、常温及び高温硬
度を高めて耐摩耗性の向上に寄与する。また、このＭＣ
型炭化物は、厚さ方向に枝状に生成し、基地の塑性変形
を抑制するから、機械的性質、さらには耐クラック性の
向上にも寄与する。このため、Ｖ及び／又はＮｂを１.
０％以上含有させる。一方、あまりに多く含有すると、
炭化物が偏析を起こし易くなり、所定の黒鉛量を得るこ
とが難しくなる。このため、Ｖ及び／又はＮｂの上限は
１０.０％に規定する。V, Nb: One or two kinds are 1.0 in total.
-10.0% V and Nb combine with C together with Fe, Cr, Mo, and W to mainly form MC-type carbides, increase hardness at normal temperature and high temperature, and contribute to improvement of wear resistance. Also, this MC
The type carbide is formed in a branch shape in the thickness direction and suppresses plastic deformation of the matrix, so that it contributes to improvement in mechanical properties and crack resistance. Therefore, V and / or Nb should be 1.
0% or more is contained. On the other hand, if contained too much,
Carbides are likely to cause segregation, making it difficult to obtain a predetermined amount of graphite. For this reason, the upper limit of V and / or Nb is specified to 10.0%.
【００１５】Ｏ：１００ppm以下 Ｏは炭化物を安定化させる作用があり、炭化物を必要以
上に増加させて、黒鉛を晶出し難くする。また、非金属
介在物となって材質の清浄度を低下させるため、Ｏの多
量含有は鋳造割れを発生し易くする。このため、本発明
では、適当な脱酸処理を施すことにより、Ｏの含有量が
１００ppm以下となるようにする。なお、望ましくは８
０ppm以下、より望ましくは４０ppm以下となるようにす
るのがよい。O: 100 ppm or less O has an effect of stabilizing carbides, increases carbides more than necessary, and makes it difficult to crystallize graphite. Further, since it becomes a non-metallic inclusion and lowers the cleanliness of the material, a large amount of O tends to cause casting cracks. Therefore, in the present invention, the O content is controlled to 100 ppm or less by performing an appropriate deoxidation treatment. Preferably, 8
The content is preferably set to 0 ppm or less, more preferably 40 ppm or less.
【００１６】Ｎ：３００ppm以下 Ｎは、非金属介在物となって材質の清浄度を低下させる
ため、Ｎの多量含有は鋳造割れを発生し易くするる。こ
のため、本発明では適当な脱窒処理を施すことにより、
Ｎの含有量が３００ppm以下となるようにする。なお、
望ましくは２５０ppm以下、より望ましくは１３０ppm以
下となるようにするのがよい。N: 300 ppm or less N becomes nonmetallic inclusions and lowers the cleanliness of the material. Therefore, a large amount of N tends to cause casting cracks. Therefore, in the present invention, by performing an appropriate denitrification treatment,
The content of N should be 300 ppm or less. In addition,
It is desirable that the content be desirably 250 ppm or less, more desirably 130 ppm or less.
【００１７】Ｃｏ：０.５〜１０.０％ 本発明の鋳鉄材は、必要に応じてＣｏを含有することが
できる。Ｃｏは、基地を改善する上で大きな効果があ
る。ＣｏはＣの拡散を抑制する特殊な作用があり、炭化
物形成には無関係に基地に固溶して強靭性を増すと共
に、硬度を高めて耐摩耗性の向上に寄与する。また、Ｃ
ｏは炭化物生成元素のオーステナイト中への固溶量を増
大させるため、基地の硬度と焼戻し抵抗が増大する。し
かし、あまりに多く含有してもその効果は飽和し、経済
的に不利である。このため、必要に応じて含有させる場
合でも、０.５〜１０.０％とする。Co: 0.5 to 10.0% The cast iron material of the present invention can contain Co if necessary. Co has a great effect on improving the base. Co has a special action of suppressing the diffusion of C, and forms a solid solution in the matrix irrespective of carbide formation to increase toughness, and also increases hardness to contribute to improvement of wear resistance. Also, C
O increases the solid solution amount of the carbide-forming element in austenite, so that the hardness of the matrix and the tempering resistance increase. However, the effect is saturated even if it is contained in too much, which is economically disadvantageous. For this reason, even if it is contained as necessary, it is set to 0.5 to 10.0%.
【００１８】Ａｌ：０.０１〜０.５０％、Ｔｉ：０.０
１〜２.０％、Ｚｒ：０.０１〜２.０％ 本発明の鋳鉄材は、必要に応じて、Ａｌ、Ｔｉ、Ｚｒの
内の一種又は二種以上を含有することができる。Ａｌ、
Ｔｉ、Ｚｒは溶湯中で酸化物を生成して、溶湯中の酸素
含有量を低下させ、製品の健全性を向上させると共に、
生成した酸化物が結晶核として作用するために凝固組織
の微細化に効果がある。一方、あまりに多く含有すると
介在物となって残存する不都合がある。このため、Ａ
ｌ、Ｔｉ、Ｚｒを添加する場合でも、鋳鉄材における含
有量は夫々、Ａｌ：０.０１〜０.５０％、Ｔｉ：０.０
１〜２.０％、Ｚｒ：０.０１〜２.０％となるようにす
る。Al: 0.01 to 0.50%, Ti: 0.0
1 to 2.0%, Zr: 0.01 to 2.0% The cast iron material of the present invention can contain one or more of Al, Ti, and Zr as necessary. Al,
Ti and Zr generate oxides in the molten metal, reduce the oxygen content in the molten metal, improve the soundness of the product,
Since the generated oxide acts as a crystal nucleus, it is effective in refining the solidified structure. On the other hand, if the content is too large, there is an inconvenience of remaining as inclusions. Therefore, A
Even when l, Ti, and Zr are added, the content in the cast iron material is 0.01 to 0.50% for Al, and 0.0 for Ti, respectively.
1 to 2.0%, Zr: 0.01 to 2.0%.
【００１９】Ｂ：０.０１〜０.５０％ 本発明の鋳鉄材は、必要に応じて、Ｂをさらに含有する
ことができる。Ｂは、溶湯中の酸素と結合して、脱酸効
果を示す。その他、生成した酸化物を核とする凝固組織
の微細化効果、および基地中に溶け込んだＢによる焼入
れ性の増大効果を有する。圧延ロールのように質量の大
きな鋳物の場合、冷却速度を速くすることは一般に困難
であるが、焼入れ性の向上により、良好な焼入れ組織を
得易くなる。一方、含有量が多すぎると材質が脆くなり
好ましくない。このため、必要に応じて含有させる場合
でも、鋳鉄材における含有量は０.０１〜０.５０％とな
るようにする。B: 0.01 to 0.50% The cast iron material of the present invention can further contain B, if necessary. B combines with oxygen in the molten metal to exhibit a deoxidizing effect. In addition, it has an effect of refining a solidified structure with the generated oxide as a nucleus and an effect of increasing hardenability due to B dissolved in the matrix. In the case of a casting having a large mass such as a rolling roll, it is generally difficult to increase the cooling rate, but it is easy to obtain a good quenched structure by improving the hardenability. On the other hand, if the content is too large, the material becomes brittle, which is not preferable. For this reason, even if it is contained as necessary, the content in the cast iron material is set to 0.01 to 0.50%.
【００２０】本発明のハイス系鋳鉄材は上記成分を含有
し、残部はＦｅ及び不可避的に混入する不純物で形成さ
れる。例えば、Ｐ、Ｓは原料より不可避的に混入する
が、材質を脆くするので少ない程好ましく、Ｐ：０.２
％以下、Ｓ：０.１％以下にするのがよい。The high-speed cast iron material of the present invention contains the above-mentioned components, and the balance is formed of Fe and impurities unavoidably mixed. For example, P and S are inevitably mixed in from the raw material, but are preferably as small as possible because they make the material brittle. P: 0.2
%, S: 0.1% or less.
【００２１】[0021]
【発明の実施の形態】本発明のハイス系鋳鉄材は、大気
中で溶製された鋳鉄溶湯中に、所定量の脱酸元素及び脱
窒元素を添加することにより、溶湯中で酸化物及び窒化
物を生成し、溶湯中の酸素及び窒素の含有量を低減し
て、得られた鋳鉄材に含まれるＯとＮの含有量を低減す
る。脱酸元素として、Ｓｉ、Ｍｎ、Ａｌ、Ｔｉ、Ｚｒ、
Ｂ、Ｃａ等の元素及びこれらの化合物、脱窒元素とし
て、Ｓｉ、Ａｌ、Ｔｉ、Ｖ等の元素及びこれらの化合物
を挙げることができるが、これらに限定されるものでは
ない。なお、脱酸元素としてＣａを投入した場合、Ｃａ
は、Ｃａ酸化物又はスラグとして殆んど排除されるた
め、鋳造品中におけるＣａの含有量は殆んど皆無とな
る。BEST MODE FOR CARRYING OUT THE INVENTION A high-speed cast iron material according to the present invention is prepared by adding a predetermined amount of a deoxidizing element and a denitrifying element to a molten cast iron melted in the atmosphere to form an oxide and A nitride is generated, the contents of oxygen and nitrogen in the molten metal are reduced, and the contents of O and N contained in the obtained cast iron material are reduced. As deoxidizing elements, Si, Mn, Al, Ti, Zr,
Elements such as B and Ca and their compounds and denitrifying elements include elements such as Si, Al, Ti and V and their compounds, but are not limited thereto. When Ca is added as a deoxidizing element, Ca
Is almost eliminated as Ca oxide or slag, so that the content of Ca in the cast product is almost nil.
【００２２】本発明の黒鉛晶出ハイス系鋳鉄材は、外層
が中実状内層又は円筒状内層に、溶着又は焼き嵌めされ
た二層複合ロール、あるいは外層と内層との間に中間層
を鋳造形成した三層複合ロールの外層材として好適に使
用される。内層材として、高級鋳鉄、ダクタイル鋳鉄、
黒鉛鋼等の強靭性を有する材料が使用され、中間層材と
してアダマイト材が使用される。中実複合ロールは、金
型遠心力鋳造法により外層、必要に応じて中間層を鋳造
した後、その内部に内層が静置鋳造することにより作製
できる。スリーブ状のロールの場合、内層も遠心力鋳造
により作製される。遠心力鋳造法には、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
各種の方法を用いることができる。The graphite-crystallized high-speed cast iron material of the present invention is a two-layer composite roll in which an outer layer is welded or shrink-fitted to a solid inner layer or a cylindrical inner layer, or an intermediate layer is formed between the outer layer and the inner layer. It is suitably used as an outer layer material of the three-layer composite roll. High grade cast iron, ductile cast iron,
A tough material such as graphite steel is used, and an adamite material is used as an intermediate layer material. The solid composite roll can be manufactured by casting an outer layer and, if necessary, an intermediate layer by a centrifugal force casting method, and then casting the inner layer inside the inner layer. In the case of a sleeve-shaped roll, the inner layer is also made by centrifugal casting. Various methods can be used for the centrifugal casting method, in which the rotation axis of the mold is horizontal, horizontal, oblique, or vertical.
【００２３】本発明のハイス系鋳鉄材を外層に用いた複
合ロールの場合、鋳造後、外層に所定の熱処理が施され
る。例えば、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、５００〜６００℃の温
度で１回乃至数回の焼戻しが行なわれる。In the case of the composite roll using the high-speed cast iron material of the present invention for the outer layer, a predetermined heat treatment is applied to the outer layer after casting. For example, from an austenitizing temperature of 650 to 400
After rapidly cooling the temperature range up to 100 ° C. at a cooling rate of 100 ° C./Hr or more to obtain a good quenched structure, tempering is performed once or several times at a temperature of 500 to 600 ° C.
【００２４】[0024]
【実施例】高周波誘導溶解炉にて、表１に示す各種成分
組成の合金溶湯を溶製し、遠心力鋳造に付して供試用の
中空円筒体を得た。遠心力鋳造時の金型回転数はＧナン
バーが１４０、鋳込み温度は１３００℃であり、得られ
た供試材は外径３１８mm、内径２３８mm、長さ５５０mm
である。EXAMPLES In a high-frequency induction melting furnace, molten alloys having various component compositions shown in Table 1 were melted and subjected to centrifugal casting to obtain hollow cylinders for test purposes. The number of rotations of the mold during centrifugal casting was G number 140, the casting temperature was 1300 ° C, and the obtained test material was 318 mm in outer diameter, 238 mm in inner diameter, and 550 mm in length.
It is.
【００２５】表１中、No.１は、脱酸処理と脱窒処理を
行なわなかった例、No.２及びNo.３は鋳鉄溶湯中にフェ
ロチタン(Ｆｅ−Ｔｉ)を０.０５重量％投入した例、No.
４はフェロチタンの他に脱酸剤としてＡｌを０.０５重
量％投入した例、No.５は、フェロチタンの他に脱酸剤
としてＢを０.０３重量％投入した例である。なお、フ
ェロチタンの投入量が０.０５重量％程度であれば、Ｔ
ｉは、Ｔｉ酸化物及びＴｉ窒化物としてほぼ完全に取り
除かれるため、鋳造品中におけるＴｉ含有量は実質的に
皆無である。In Table 1, No. 1 is an example in which deoxidation treatment and denitrification treatment were not performed, and No. 2 and No. 3 contained 0.05% by weight of ferro-titanium (Fe-Ti) in molten cast iron. Example of input, No.
No. 4 is an example where 0.05% by weight of Al was added as a deoxidizing agent in addition to ferrotitanium, and No. 5 was an example where 0.03% by weight of B was added as a deoxidizing agent in addition to ferrotitanium. If the input amount of ferro-titanium is about 0.05% by weight, T
Since i is almost completely removed as Ti oxide and Ti nitride, there is substantially no Ti content in the casting.
【００２６】各供試材より組織観察用の試験片を採取
し、ミクロ組織を顕微鏡観察し、晶出黒鉛の面積率を測
定した。その結果を表１に併せて示している。A specimen for observing the structure was collected from each test material, the microstructure was observed under a microscope, and the area ratio of the crystallized graphite was measured. The results are also shown in Table 1.
【００２７】[0027]
【表１】 [Table 1]
【００２８】表１の結果より、Ｓｉ含有量がほぼ同じで
も、Ｏの含有量が少なくなると、黒鉛の晶出量が多くな
ることを示しており、Ｏが４０ppm以下になれば、黒鉛
を面積率で３.８％以上晶出させることができる。The results in Table 1 show that, even when the Si content is almost the same, the crystallization amount of graphite increases when the O content decreases, and when the O content is 40 ppm or less, the graphite is reduced in area. At a rate of 3.8% or more.
【００２９】なお、各供試材は、鋳造後、金型から取り
外した際、外観を目視検査したところ、No.１の表面に
は、管軸方向に伸びるクラックの発生が観察された。但
し、クラックの深さは比較的浅く、その後の機械加工で
除去できる程度であった。なお、供試No.２〜No.５に
は、クラックの発生は全く認められなかった。これらの
結果より、Ｎの含有量が多いと、鋳造割れに対する感受
性が高くなる不都合のあることがわかる。When each test material was removed from the mold after casting, the appearance was visually inspected. As a result, cracks extending in the tube axis direction were observed on the surface of No. 1. However, the depth of the crack was relatively shallow, and could be removed by subsequent machining. No cracks were observed in Test Nos. 2 to 5 at all. From these results, it is understood that when the content of N is large, there is an inconvenience that the sensitivity to casting cracks increases.
【００３０】[0030]
【発明の効果】本発明の黒鉛晶出ハイス系鋳鉄材を外層
として用いた複合ロールは、黒鉛の晶出を容易にし、製
作途中で鋳造割れを発生しにくい利点を有しており、熱
間圧延あるいは冷間圧延用の圧延用複合ロールの外層材
として好適である。The composite roll using the graphite-crystallized high-speed cast iron material of the present invention as an outer layer has the advantage that the crystallization of graphite is facilitated and casting cracks are less likely to occur during the production. It is suitable as an outer layer material of a rolling composite roll for rolling or cold rolling.
Claims (4)
ｉ：１.０〜３.５％、Ｍｎ：０.１〜２.０％、Ｎｉ：
０.５〜１０.０％、Ｃｒ：１.５〜１０.０％、Ｍｏ：
０.１〜１０.０％、Ｗ：０.１〜１０.０％、Ｖ、Ｎｂの
一種又は二種を合計量で１.０〜１０.０％含有し、Ｏ：
１００ppm以下、Ｎ：３００ppm以下であり、残部実質的
にＦｅからなる黒鉛を有するハイス系鋳鉄材。C. 1.8 to 3.6% by weight of C,
i: 1.0 to 3.5%, Mn: 0.1 to 2.0%, Ni:
0.5 to 10.0%, Cr: 1.5 to 10.0%, Mo:
0.1 to 10.0%, W: 0.1 to 10.0%, one or two kinds of V and Nb are contained in a total amount of 1.0 to 10.0%, and O:
A high-speed cast iron material containing 100 ppm or less, N: 300 ppm or less, and the balance substantially consisting of Fe.
請求項１に記載のハイス系鋳鉄材。2. The high-speed cast iron material according to claim 1, which contains 0.5 to 10.0% of Co.
０１〜２.０％、Ｚｒ：０.０１〜２.０％の内の一種又
は二種以上を含有している請求項１又は２に記載のハイ
ス系鋳鉄材。3. Al: 0.01 to 0.50%, Ti: 0.5%.
The high-speed cast iron material according to claim 1 or 2, which contains one or more of Zr: 0.01 to 2.0% and Zr: 0.01 to 2.0%.
請求項１乃至３のいずれかに記載のハイス系鋳鉄材。4. The high-speed cast iron material according to claim 1, which contains B: 0.01 to 0.50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22827196A JP3268210B2 (en) | 1996-08-29 | 1996-08-29 | High-speed cast iron with graphite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22827196A JP3268210B2 (en) | 1996-08-29 | 1996-08-29 | High-speed cast iron with graphite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1068041A true JPH1068041A (en) | 1998-03-10 |
| JP3268210B2 JP3268210B2 (en) | 2002-03-25 |
Family
ID=16873867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22827196A Expired - Lifetime JP3268210B2 (en) | 1996-08-29 | 1996-08-29 | High-speed cast iron with graphite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3268210B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2835850A1 (en) * | 2002-02-12 | 2003-08-15 | Winsert Inc | Iron-based alloy used in the production of a valve seat ring in an internal combustion engine contains alloying additions of carbon, chromium, silicon, molybdenum, nickel and optionally cobalt, vanadium, niobium, manganese and tungsten |
| US6616777B1 (en) * | 1998-07-14 | 2003-09-09 | Honda Giken Kogyo Kabushiki Kaisha | Fe alloy material for thixocasting and method for heating the same |
| KR100611201B1 (en) | 2005-01-06 | 2006-08-09 | 현대제철 주식회사 | High speed steel compound roll for hot strip milling having excellent roughness-resistance |
| JP2008264828A (en) * | 2007-04-19 | 2008-11-06 | Fujikoo:Kk | Composite roll for hot rolling, manufacturing method of the same and hot rolling method |
| US7611590B2 (en) | 2004-07-08 | 2009-11-03 | Alloy Technology Solutions, Inc. | Wear resistant alloy for valve seat insert used in internal combustion engines |
| US7754142B2 (en) | 2007-04-13 | 2010-07-13 | Winsert, Inc. | Acid resistant austenitic alloy for valve seat inserts |
| EP2354264A1 (en) * | 2010-01-15 | 2011-08-10 | Maschinenfabrik Köppern GmbH. & Co. KG | Wear-resistant, heat-resistant material and use of same |
| CN106756533A (en) * | 2016-11-23 | 2017-05-31 | 安徽瑞鑫自动化仪表有限公司 | A kind of temperature sensor steel alloy and preparation method thereof |
| CN107287495A (en) * | 2017-07-17 | 2017-10-24 | 西安工业大学 | A kind of Wear-resistant food mechanical material and preparation method thereof |
-
1996
- 1996-08-29 JP JP22827196A patent/JP3268210B2/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6616777B1 (en) * | 1998-07-14 | 2003-09-09 | Honda Giken Kogyo Kabushiki Kaisha | Fe alloy material for thixocasting and method for heating the same |
| FR2835850A1 (en) * | 2002-02-12 | 2003-08-15 | Winsert Inc | Iron-based alloy used in the production of a valve seat ring in an internal combustion engine contains alloying additions of carbon, chromium, silicon, molybdenum, nickel and optionally cobalt, vanadium, niobium, manganese and tungsten |
| US6916444B1 (en) | 2002-02-12 | 2005-07-12 | Alloy Technology Solutions, Inc. | Wear resistant alloy containing residual austenite for valve seat insert |
| US7611590B2 (en) | 2004-07-08 | 2009-11-03 | Alloy Technology Solutions, Inc. | Wear resistant alloy for valve seat insert used in internal combustion engines |
| KR100611201B1 (en) | 2005-01-06 | 2006-08-09 | 현대제철 주식회사 | High speed steel compound roll for hot strip milling having excellent roughness-resistance |
| US7754142B2 (en) | 2007-04-13 | 2010-07-13 | Winsert, Inc. | Acid resistant austenitic alloy for valve seat inserts |
| JP2008264828A (en) * | 2007-04-19 | 2008-11-06 | Fujikoo:Kk | Composite roll for hot rolling, manufacturing method of the same and hot rolling method |
| EP2354264A1 (en) * | 2010-01-15 | 2011-08-10 | Maschinenfabrik Köppern GmbH. & Co. KG | Wear-resistant, heat-resistant material and use of same |
| CN106756533A (en) * | 2016-11-23 | 2017-05-31 | 安徽瑞鑫自动化仪表有限公司 | A kind of temperature sensor steel alloy and preparation method thereof |
| CN107287495A (en) * | 2017-07-17 | 2017-10-24 | 西安工业大学 | A kind of Wear-resistant food mechanical material and preparation method thereof |
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|---|---|
| JP3268210B2 (en) | 2002-03-25 |
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