JP3468381B2 - Assembling type roll - Google Patents
Assembling type rollInfo
- Publication number
- JP3468381B2 JP3468381B2 JP23697694A JP23697694A JP3468381B2 JP 3468381 B2 JP3468381 B2 JP 3468381B2 JP 23697694 A JP23697694 A JP 23697694A JP 23697694 A JP23697694 A JP 23697694A JP 3468381 B2 JP3468381 B2 JP 3468381B2
- Authority
- JP
- Japan
- Prior art keywords
- outer layer
- composite sleeve
- graphite
- roll
- rolling
- 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.)
- Expired - Lifetime
Links
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は高耐摩耗性、耐焼付き性
を有すると共に、耐亀裂性に優れた組立式圧延用ロール
に関し、特に連続熱間薄板圧延機の作動ロールとして好
適なロールに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll for assembling type rolling having high wear resistance and seizure resistance and excellent crack resistance, and more particularly to a roll suitable as an operating roll for a continuous hot strip mill. .
【0002】[0002]
【従来の技術】従来、連続熱間薄板圧延機の作動ロール
にはグレン鋳鉄材質等を外層とする一体式複合ロールが
用いらていた。グレン鋳鉄材質はその金属組織中に黒鉛
が含まれており、圧延中に例えば絞り圧延事故に遭遇し
たときでも、黒鉛の効果により被圧延材の焼付きが少な
く、且つ亀裂の発生及び進展が比較的少ないので、安定
した材質として永年に亘って重用されてきた。しかし、
耐摩耗性については、ロールに要求される水準の高度化
に伴って、不満足となりつつあった。最近は、この要求
を満たすものとして、例えばWO88/07594号公報に開示さ
れている外層がハイス系材質の高耐摩耗性ロールの適用
が拡がりつつある。ハイス系材質のロールは耐摩耗性が
飛躍的に優れているので、圧延技術の向上に著しく貢献
しているが、耐焼付き性、耐亀裂性の点でまだ十分満足
されていない。2. Description of the Related Art Conventionally, an integral type composite roll having a grain cast iron material as an outer layer has been used as a working roll of a continuous hot strip rolling mill. The grain cast iron material contains graphite in its metal structure, and even when a rolling accident, for example, is encountered during rolling, there is less seizure of the rolled material due to the effect of graphite, and the occurrence and development of cracks are compared. It has been used for a long time as a stable material because it is very few. But,
The wear resistance was becoming unsatisfactory with the sophistication of the level required for rolls. Recently, as a material satisfying this requirement, for example, the application of a high wear-resistant roll whose outer layer is a high-speed material disclosed in WO88 / 07594 is spreading. Rolls made of high-speed steel material have dramatically improved wear resistance, and thus have significantly contributed to the improvement of rolling technology, but have not been sufficiently satisfied in terms of seizure resistance and crack resistance.
【0003】熱間圧延用ロールは、圧延中に例えば絞り
圧延事故に遭遇したとき、強圧を受けて被圧延材が焼付
き、それに起因して亀裂が発生及び進展しやすい。ま
た、噛み止め事故に遭遇したときは、その熱衝撃を受け
て亀裂が発生及び進展しやすい。これらの亀裂が著しく
進展した場合は、ロール全体の破損に至ることがある。
このような場合、ロールの破損による圧延作業の停止は
莫大な損害となるが、特にハイス系材質を用いた高価な
ロールの場合はその損害がさらに大きくなる。When a roll for hot rolling encounters, for example, a rolling accident during rolling, it is subjected to strong pressure to seize the material to be rolled, and as a result, cracks are likely to occur and propagate. In addition, when a bite prevention accident is encountered, a crack is likely to be generated and propagate due to the thermal shock. If these cracks grow significantly, the entire roll may be damaged.
In such a case, stopping the rolling operation due to damage to the rolls causes enormous damage, but particularly in the case of expensive rolls made of high-speed material, the damage is further increased.
【0004】ロール全体を作り替えると非経済的である
ので、胴部のみの取替えを可能にするものとして、種々
の組立式圧延用ロールが開示されている。例えば、実公
昭45-7640号公報には、熱亀裂の発生及び伝播に対して
強い材料からなるスリーブをアーバーに焼嵌めした組立
式熱間圧延用作動ロールが、特開昭50-3922号公報に
は、高合金鋳鋼の外層と低合金強靱鋳鋼の内層とからな
り、「外層の肉厚/内層の肉厚」比を0.4〜1.2とした外径
1000mm以上の大形厚肉高硬度複合スリーブが、特開昭54
-86463号公報には、ネック部径と胴部外径との比、胴部
廃却径と胴部外径との比を特定した圧延用ワークロール
において、スリーブの内径を軸受部径に略等しくした圧
延用組立式ワークロールが開示されている。Since it is uneconomical to remake the entire roll, various prefabricated rolling rolls have been disclosed as being able to replace only the body. For example, Japanese Utility Model Publication No. 45-7640 discloses an assembly type hot rolling working roll in which a sleeve made of a material strong against the occurrence and propagation of thermal cracks is shrink-fitted to an arbor, and is disclosed in Japanese Patent Application Laid-Open No. 50-3922. Consists of an outer layer of high-alloy cast steel and an inner layer of low-alloy tough cast steel, with an outer diameter of 0.4 to 1.2 for the "outer layer thickness / inner layer thickness" ratio.
A large, thick, high-hardness composite sleeve of 1000 mm or more is disclosed in
-86463 gazette discloses that in a work roll for rolling in which the ratio of the neck diameter to the outer diameter of the body and the ratio of the discarded diameter of the body to the outer diameter of the body are specified, the inner diameter of the sleeve is approximately equal to the bearing diameter. Equalized rollable work rolls are disclosed.
【0005】一方、特開平2-30730号公報には金属組織
中に黒鉛を含有させたハイス系材質の開示がある。同公
報の材質は、金属組織中に黒鉛と面積比で20%以上のMC
系、M4C3系、M2C系、M6C系の硬質炭化物とを有し、化学
成分が重量比でC:2.5〜4%、Si:2〜5%、Mn:0.1〜1.5
%、Ni:3〜8%、Cr:7%以下、Mo:4〜12%、V:2〜8%か
らなり、さらにCo:2〜8%を含むことができるFe基合金
であって、熱間或いは冷間圧延用ロール等に用いられ
る。また、特開平4-191347号公報には黒鉛を含まないハ
イス系材質を用いた組立式圧延ロール用中空スリーブ材
が、特開平4-344807号公報には外層を黒鉛を含まないハ
イス系材質、内層を強靱鋳鉄又は黒鉛鋼により形成した
H形鋼圧延用複合スリーブロールが開示されている。On the other hand, Japanese Patent Laid-Open No. 2-30730 discloses a high speed material containing graphite in its metal structure. The material of the publication is 20% or more of the area ratio of graphite and MC in the metal structure.
System, M 4 C 3 system, M 2 C type, and a hard carbide of M 6 C type, chemical composition in a weight ratio C: 2.5~4%, Si: 2~5 %, Mn: 0.1~1.5
%, Ni: 3 to 8%, Cr: 7% or less, Mo: 4 to 12%, V: 2 to 8%, and a Fe-based alloy that can further contain Co: 2 to 8%, It is used for hot or cold rolling rolls. Further, JP-A 4-191347 discloses a hollow sleeve material for assembling type rolling rolls using a high-speed material containing no graphite, and JP-A 4-344807 discloses a high-speed material containing no graphite as an outer layer, A composite sleeve roll for H-section steel rolling is disclosed in which the inner layer is made of tough cast iron or graphite steel.
【0006】これら従来から公知のロールにおいて、化
学成分又は材質の点で耐摩耗性、耐焼付き性を向上させ
ると共に耐亀裂性を向上させる配慮はなされているが、
材質が本来有する特性の域を越えるものでない。そし
て、外層が黒鉛を有するハイス系材質の複合スリーブを
用い、耐摩耗性、耐焼付き性、耐亀裂性、経済性の向上
を図った組立式圧延用ロールについての開示はない。[0006] In these conventionally known rolls, consideration is given to improving the wear resistance and seizure resistance as well as the crack resistance in terms of chemical composition or material.
It does not exceed the range of the original properties of the material. Further, there is no disclosure of a prefabricated rolling roll using a composite sleeve made of a high-speed material having an outer layer of graphite and having improved wear resistance, seizure resistance, crack resistance, and economic efficiency.
【0007】[0007]
【発明が解決しようとする課題】本発明の目的は、前述
のハイス系材質ロールの問題点を解消し、ハイス系材質
ロールが本来有する高耐摩耗性を発揮すると共に耐焼付
き性に優れ、さらに亀裂の発生進展によるロール破損の
恐れがない安定して使用できる経済性に優れた組立式圧
延用ロールを提供することにある。SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of HSS-based material rolls, to exhibit the high wear resistance inherent to HSS-based material rolls, and to have excellent seizure resistance. An object of the present invention is to provide a roll for assembling type rolling that is stable and can be used stably without the risk of roll breakage due to the development of cracks.
【0008】[0008]
【課題を解決するための手段】上記課題を解決するた
め、本発明者は胴部構成用複合スリーブの外層に適用す
る材質として黒鉛を有するハイス系材質の追究により高
耐摩耗性と耐焼付き性を得ると共に、仮りに焼付いた場
合でもそれに伴う亀裂の発生及び進展に対する抵抗性を
得るため外層に圧縮応力を付与しておくことに着目し
た。圧縮応力は、実際の圧延に用いられた多くのロール
の事例を解析し、追究の結果、200MPa以上を付与してお
く必要があり、このためには「外層の断面積/内層の断
面積」の値を0.7以下に設定すれば良く、その結果耐摩
耗性、耐焼付き性に優れると共に、耐亀裂性を備えた経
済的な組立式圧延用ロールが得られるという結論を得
た。In order to solve the above-mentioned problems, the present inventor has pursued a high-speed material having graphite as a material to be applied to the outer layer of the composite sleeve for forming the trunk portion, thereby obtaining high wear resistance and seizure resistance. At the same time, we focused on applying a compressive stress to the outer layer in order to obtain resistance to the occurrence and development of cracks accompanying it even if seizure occurs. As for the compressive stress, it is necessary to analyze the case of many rolls used for actual rolling, and as a result of investigation, it is necessary to give more than 200MPa. For this purpose, "cross-sectional area of outer layer / cross-sectional area of inner layer" It was concluded that the value of should be set to 0.7 or less, and as a result, an economical assembling roll for rolling having excellent wear resistance and seizure resistance as well as crack resistance can be obtained.
【0009】本発明の第1発明は、連続熱間薄板圧延機
の作動ロールであって、胴部構成用複合スリーブは遠心
力鋳造法、連続肉盛鋳造法、静置鋳造法のうちいずれか
の鋳造法で製作され、重量比でC:2〜4%、Si:0.5〜4
%、Mn:0. 1〜1.5%、Cr:1〜7%、Mo:2〜10%、V:2〜10
%の化学成分を含み残部が実質的にFe及び不可避的不純
物からなり、金属組織は基地組織と面積比で0.5〜5%の
黒鉛と0.2〜10%のMC系炭化物と40%以下のセメンタイ
トとを含み、硬さがHS:70以上の外層と、重量比でC:0.1
〜2%を含む鋳鋼又は鍛鋼又は黒鉛鋳鋼の内層とを金属
的に接合した胴部構成用複合スリーブを軸材に嵌合固定
されてなり、胴部構成用複合スリーブは、回転軸と直角
の断面における「外層の断面積/内層の断面積」の値が
0.7以下で、内径が軸材の軸受部の直径以上であること
を特徴とする組立式圧延用ロールである。A first aspect of the present invention is a continuous hot strip rolling mill.
The working roll of the
One of the force casting method, continuous overlay casting method and static casting method
Made by the casting method of C: 2-4% by weight, Si: 0.5-4
%, Mn: 0.1-1.5%, Cr: 1-7%, Mo: 2-10%, V: 2-10
% Chemical constituents and the balance is essentially Fe and unavoidable impurities
Made from the object, the metal structure comprises a 0.5% to 5% of graphite and 0.2 to 10% of the MC carbides and 40% or less of the cementite in the matrix structure and area ratio, hardness HS: 70 or more of the outer layer, the weight C: 0.1 in ratio
A composite sleeve for body part, which is metallically joined to an inner layer of cast steel, forged steel or graphite cast steel containing ~ 2%, is fitted and fixed to the shaft member, and the composite sleeve for body part is perpendicular to the rotation axis. The value of "cross-sectional area of outer layer / cross-sectional area of inner layer" in the cross section is
It is a roll for assembling rolling characterized in that it is 0.7 or less and the inner diameter is not less than the diameter of the bearing portion of the shaft material.
【0010】第2発明は、第1発明ロールの複合スリー
ブの外層の金属組織がMC系炭化物以外にさらにM2C系炭
化物、M6C系炭化物、M7C3系炭化物の何れか1種以上を
面積比で0.2〜20%含む組立式圧延用ロールである。The second invention is that the metal structure of the outer layer of the composite sleeve of the first invention roll is any one of M 2 C based carbide, M 6 C based carbide and M 7 C 3 based carbide in addition to the MC based carbide. It is an assembling type rolling roll containing the above in an area ratio of 0.2 to 20%.
【0011】第3発明は、第1発明ロール又は第2発明
ロールの複合スリーブの外層がさらに重量比でNi:0.2〜
4%、W:2〜10%、Co:1〜10%、Nb:1〜10%、Ti:0.01〜2
%、B:0.002〜0.2%、Cu:0.02〜1%の内の何れか1種以
上を含む組立式圧延用ロールである。In a third invention, the outer layer of the composite sleeve of the first invention roll or the second invention roll further has a weight ratio of Ni: 0.2 to.
4%, W: 2-10%, Co: 1-10%, Nb: 1-10%, Ti: 0.01-2
%, B: 0.002 to 0.2% and Cu: 0.02 to 1%.
【0012】[0012]
【作用】本発明における複合スリーブの外層材質が含む
合金元素量は、外層材質として必要な耐摩耗性、耐焼付
き性、耐亀裂性、硬さ、圧縮残留応力を確保する上で、
次の通り限定される。The amount of alloying elements contained in the material of the outer layer of the composite sleeve in the present invention depends on the wear resistance, seizure resistance, crack resistance, hardness and compressive residual stress required for the material of the outer layer.
Limited as follows.
【0013】C:2〜4重量%
Cは同時に含まれるCr、V、Mo、W等と結合して硬質の炭
化物を生成し、耐摩耗性の向上に寄与すると共に、黒鉛
を晶出して耐焼付き性を付与するのに必要である。Cが1
重量%未満では硬質の炭化物量が不足して耐摩耗性が得
られず、4重量%を越えるとセメンタイトや硬質の炭化
物が多くなりすぎて靭性が低下する。 C: 2 to 4 wt% C combines with Cr, V, Mo, W, etc. contained at the same time to form a hard carbide, which contributes to the improvement of wear resistance and at the same time, crystallizes graphite to cause calcination resistance. Necessary for imparting suppleness. C is 1
If it is less than 4% by weight, the amount of hard carbides is insufficient and wear resistance cannot be obtained. If it exceeds 4% by weight, cementite and hard carbides are too much and the toughness is lowered.
【0014】Si:0.5〜4重量%
Siは黒鉛化を促進するため0.5重量%以上必要である。
また、脱酸剤としても有効である。しかし、4重量%を
越えると材質的に脆化して靭性が低下する。また、黒鉛
を晶出させるために0.1重量%以上、好ましくは0.1〜0.
8重量%のSiを接種により添加する必要がある。接種Si
量が0.8重量%を越えると、接種剤が溶湯中に溶け難く
なり、鋳造組織にむらが生じ易くなる。この接種により
添加するSi量と溶湯中に最初から存在したいたSi量との
合計量が上記Siの含有量となる。 Si: 0.5-4 wt% Si is required to be 0.5 wt% or more in order to promote graphitization.
It is also effective as a deoxidizer. However, if it exceeds 4% by weight, the material becomes brittle and the toughness decreases. Further, in order to crystallize graphite, 0.1% by weight or more, preferably 0.1 to 0.
It is necessary to add 8 wt% Si by inoculation. Inoculation Si
If the amount exceeds 0.8% by weight, the inoculant becomes difficult to dissolve in the molten metal and uneven casting structure is likely to occur. The total amount of Si added by this inoculation and the amount of Si originally present in the molten metal becomes the content of Si.
【0015】Mn:0.1〜1.5重量%
Mnは溶湯の脱酸や脱硫に効果があり、0.1重量%以上必
要である。しかし、1.5重量%を越えると基地組織中に
残留オーステナイトを生じ易くなり、製作する際に安定
した硬さを得難くなるので好ましくない。 Mn: 0.1 to 1.5 wt% Mn is effective in deoxidizing and desulfurizing the molten metal, and is required to be 0.1 wt% or more. However, if it exceeds 1.5% by weight, retained austenite is likely to be generated in the matrix structure, and it becomes difficult to obtain stable hardness during manufacturing, which is not preferable.
【0016】Cr:1〜7重量%
Crは基地組織をベイナイト又はマルテンサイトにして硬
化するので、耐摩耗性の向上に有効であり、1重量%以
上必要である。しかし、7重量%を越えると基地組織の
靱性が低下するばかりでなく、M7C3系、M23C6系炭化物
を形成して、VによるVCのようなさらに硬質のMC炭化物
の生成を阻害するので、耐摩耗性向上効果が飽和する。 Cr: 1 to 7 wt% Cr is effective in improving the wear resistance because it hardens the matrix structure into bainite or martensite and is required to be 1 wt% or more. However, if it exceeds 7% by weight, not only the toughness of the base structure is deteriorated, but also M 7 C 3 system and M 23 C 6 system carbides are formed, and the formation of harder MC carbides such as VC by V is generated. Since it inhibits, the effect of improving wear resistance is saturated.
【0017】Mo:2〜10重量%
Moは基地組織中に固溶して基地組織を強化すると共に、
Cと結合してM2C系、M6C系炭化物を生成するので、耐摩
耗性の向上に有効であり、2重量%以上必要である。し
かし、10重量%を越えると黒鉛の晶出を阻害すると共
に、VCのようなさらに硬質のMC系炭化物の生成を少なく
する。 Mo: 2 to 10 wt% Mo is a solid solution in the base structure to strengthen the base structure,
Since it combines with C to form M 2 C-based and M 6 C-based carbides, it is effective in improving wear resistance, and 2% by weight or more is necessary. However, if it exceeds 10% by weight, crystallization of graphite is inhibited and the generation of harder MC-based carbides such as VC is reduced.
【0018】V:2〜10重量%
VはCと結合してVC、即ちMC系炭化物を生成する。VCの硬
さはHV 2500〜3000であり、炭化物の内で最も硬い。こ
のため、Vは耐摩耗性の向上に最も有効な必須元素であ
る。Vの量が2重量%未満ではVCの量が不足し、10重量%
を越えると黒鉛の晶出を阻害すると共に材質を脆化す
る。 V: 2-10 wt% V combines with C to form VC, that is, MC type carbide. The hardness of VC is HV 2500-3000, which is the hardest among carbides. Therefore, V is an essential element most effective in improving wear resistance. When the amount of V is less than 2% by weight, the amount of VC is insufficient, and 10% by weight
If it exceeds, the crystallization of graphite is inhibited and the material becomes brittle.
【0019】本発明における複合スリーブの外層材質
は、上記以外の合金元素として、さらに次の合金元素を
それぞれ単独又は複合して含むことができる。Ni:0.2〜4重量%
Niは黒鉛の晶出及び基地組織の焼入れ性向上に有効であ
る。含有量が0.2重量%以下ではその効果が期待でき
ず、4重量%を越えるとオーステナイトが安定化しす
ぎ、硬い基地組織であるベイナイト又はマルテンサイト
へ変態し難くなり、耐摩耗性が得られなくなる。The outer layer material of the composite sleeve of the present invention may further contain the following alloying elements, alone or in combination, as alloying elements other than the above. Ni: 0.2-4 wt% Ni is effective for crystallization of graphite and improvement of hardenability of matrix structure. If the content is 0.2% by weight or less, the effect cannot be expected, and if it exceeds 4% by weight, austenite is excessively stabilized, transformation to bainite or martensite having a hard matrix structure becomes difficult, and wear resistance cannot be obtained.
【0020】W:2〜10重量%
WはMoと同様に基地組織中に固溶して基地組織を強化す
ると共にCと結合してM2C系、M6C系炭化物を生成するの
で、耐摩耗性向上に有効であり、2重量%以上添加でき
る。しかし、10重量%を越えると、黒鉛の晶出を阻害す
ると共に、さらに硬質のVC等MC系炭化物の生成を少なく
する。 W: 2 to 10 wt% W, similar to Mo, forms a solid solution in the matrix structure and strengthens the matrix structure, and combines with C to form M 2 C-based and M 6 C-based carbides. It is effective in improving wear resistance and can be added in an amount of 2% by weight or more. However, if it exceeds 10% by weight, the crystallization of graphite is inhibited and the generation of hard MC-based carbides such as VC is reduced.
【0021】Co:1〜10重量%
Coは高温状態における基地を強化するので、特に熱間圧
延に用いたとき、耐摩耗性、耐肌あれ性の向上に有効で
あり、1重量%以上添加できる。しかし、Co量が10重量
%を越えると靭性が低下する。なお、Coにはセメンタイ
トを不安定にして黒鉛を晶出し易くする効果もある。 Co: 1 to 10 wt% Since Co strengthens the matrix in a high temperature state, it is particularly effective in improving wear resistance and skin roughness when used in hot rolling, and 1 wt% or more is added. it can. However, if the Co content exceeds 10% by weight, the toughness decreases. Co also has the effect of making cementite unstable and making it easy to crystallize graphite.
【0022】Nb:1〜10重量%
NbはVと同様にMC系の硬質炭化物を生成する。前述の通
りMC系炭化物は炭化物の中で最も硬いので、Nbは耐摩耗
性の向上に有効な元素であるが、過剰になると黒鉛の晶
出を阻害する。このため、Nbの添加量は1〜10重量%と
する。 Nb: 1 to 10 wt% Nb, like V, forms MC type hard carbide. As described above, MC-based carbides are the hardest of the carbides, so Nb is an element effective in improving wear resistance, but when it is excessive, it inhibits crystallization of graphite. Therefore, the amount of Nb added is 1 to 10% by weight.
【0023】Ti:0.01〜2重量%
Tiは黒鉛化阻害元素であるOやNと結合して、これらの元
素を酸化物や窒化物にすることにより固定する。その添
加量が0.01重量%未満では効果が期待できない。また、
含まれているOやNの量から、添加量の上限は2重量%で
十分である。 Ti: 0.01 to 2 wt% Ti bonds with O or N, which are graphitization inhibiting elements, and fixes these elements into oxides or nitrides. If the addition amount is less than 0.01% by weight, no effect can be expected. Also,
Based on the amounts of O and N contained, the upper limit of the amount added is 2% by weight.
【0024】B:0.002〜0.2重量%
Bは炭化物を微細化するが、添加量が0.002重量%未満で
はその効果を期待できず、0.2重量%を越えると炭化物
が不安定になる。 B: 0.002-0.2 wt% B makes the carbide fine, but if the addition amount is less than 0.002 wt%, its effect cannot be expected, and if it exceeds 0.2 wt%, the carbide becomes unstable.
【0025】Cu:0.02〜1重量%
CuはCoと同様にセメンタイトを不安定化し、黒鉛を晶出
し易くする作用がある。添加量が0.02重量%未満ではそ
の効果を期待できず、1重量%を越えると靭性が低下す
る。 Cu: 0.02 to 1 wt% Cu has an action of destabilizing cementite and facilitating crystallization of graphite similarly to Co. If the addition amount is less than 0.02% by weight, the effect cannot be expected, and if it exceeds 1% by weight, the toughness decreases.
【0026】上述の元素以外は、不純物を除いて残部は
実質的にFeである。不純物として主な元素はPとSである
が、Pは靭性低下防止のため0.05重量%以下、Sも同様理
由により0.03重量%以下にするのが望ましい。Other than the above-mentioned elements, the balance is substantially Fe except impurities. The main elements as impurities are P and S, but it is desirable that P is 0.05% by weight or less and S is 0.03% by weight or less for the same reason to prevent deterioration of toughness.
【0027】本発明における胴部構成用複合スリーブの
外層材質が具備すべき金属組織構成について研究を行っ
た結果は次の通りである。黒鉛:0.5〜5面積%
焼付き実験を行った結果、黒鉛量は耐焼付き性に比例
し、黒鉛量が0.5面積%未満では耐焼付き性向上の効果
が少なく、5面積%を越えると機械的性質が著しく低下
する。なお、黒鉛粒子の粒径は5〜50μmである。The results of studies on the metallographic structure that the outer layer material of the composite sleeve for forming the body of the present invention should have are as follows. Graphite: 0.5-5% area% As a result of a seizure test, the amount of graphite is proportional to seizure resistance. If the amount of graphite is less than 0.5% by area, the effect of improving seizure resistance is small, and if it exceeds 5% by area, it is mechanically resistant. The properties are significantly reduced. The particle size of the graphite particles is 5 to 50 μm.
【0028】MC系炭化物:0.2〜10面積%
耐摩耗性を向上させるためには、硬質炭化物が十分に分
散している必要がある。このため、最も硬質であるMC系
炭化物を0.2〜10面積%分散させる。MC系炭化物が0.2面
積%未満では耐摩耗性が十分でない。一方、10面積%を
越えてMC系炭化物を分散させるのは、黒鉛との共存関係
により、製作する上で困難である。 MC-based carbide: 0.2 to 10% by area In order to improve wear resistance, hard carbide must be sufficiently dispersed. Therefore, 0.2 to 10 area% of the hardest MC type carbide is dispersed. If the MC-based carbide is less than 0.2 area%, the wear resistance is not sufficient. On the other hand, it is difficult to disperse the MC-based carbide in excess of 10% by area due to the coexistence with graphite.
【0029】セメンタイト:40面積%以下
セメンタイトは耐焼付き性向上に寄与するが、軟質炭化
物であるため耐摩耗性向上効果が少ない。このため晶出
量を少なくしたいが、黒鉛とほぼ同時期に晶出するの
で、セメンタイトの晶出なしに黒鉛を晶出させることは
実際面で困難である。セメンタイトは過剰になると靭性
を低下させるので、40面積%以下にする必要がある。 Cementite: 40 area% or less Cementite contributes to the improvement of seizure resistance, but since it is a soft carbide, it has little effect of improving wear resistance. For this reason, it is desired to reduce the amount of crystallization, but since it crystallizes at about the same time as graphite, it is actually difficult to crystallize graphite without crystallization of cementite. If cementite is excessive, it decreases toughness, so it must be 40% by area or less.
【0030】M2C系炭化物、M6C系炭化物、M7C3系炭化物
の何れか1種以上:0.2〜20面積%
MC系炭化物以外に、さらにこれらの炭化物を分散させて
もよい。これらの炭化物が0.2面積%未満ではその影響
が十分に認められず、20面積%を越えるとセメンタイト
と合わせた炭化物の合計面積が過剰となり、靭性が低下
する。 M 2 C based carbide, M 6 C based carbide, M 7 C 3 based carbide
Any one or more of the following: 0.2 to 20 area% In addition to the MC-based carbide, these carbides may be further dispersed. If the content of these carbides is less than 0.2 area%, the effect is not sufficiently observed, and if the content exceeds 20 area%, the total area of the carbides including cementite becomes excessive and the toughness decreases.
【0031】本発明における複合スリーブは遠心力鋳造
法により製作するのが好ましいが、これにこだわること
なく、連続肉盛鋳造法、静置鋳造法等そのときの状況に
応じて他の鋳造法によっても製作できる。The composite sleeve of the present invention is preferably manufactured by a centrifugal casting method, but without being particular about this, a continuous overlay casting method, a stationary casting method, or another casting method depending on the situation at that time. Can also be produced.
【0032】複合スリーブの外層の硬さはHS:70以上が
必要である。これにより、外層材質が本来有している耐
摩耗性、耐焼付き性を確保すると共に、外層に圧縮残留
応力が付与されて、耐亀裂性が得られる。The hardness of the outer layer of the composite sleeve must be HS: 70 or more. As a result, the wear resistance and seizure resistance originally possessed by the outer layer material are secured, and compressive residual stress is imparted to the outer layer to obtain crack resistance.
【0033】複合スリーブの内層材質はC:0.1〜2重量%
を含む鋳鋼又は鍛鋼又は黒鉛鋳鋼である。これらの材質
において、Cが2重量%を越えると炭化物量又は黒鉛量が
過剰になるので、内層として必要な強さが得られない。
また、Cが0.1重量%未満のときは軟弱すぎるので、必要
な強さが得られない。The inner layer material of the composite sleeve is C: 0.1 to 2% by weight
Is a cast steel, a forged steel, or a graphite cast steel. In these materials, if C exceeds 2% by weight, the amount of carbide or the amount of graphite becomes excessive, so that the strength required for the inner layer cannot be obtained.
Further, when C is less than 0.1% by weight, the strength is too soft and the required strength cannot be obtained.
【0034】以上により構成される複合スリーブを軸受
部等を構成する軸材に嵌合固定して、本発明の組立式圧
延用ロールが得られる。このとき、複合スリーブの内
径、即ち嵌合径は、軸受部の直径以上にしないと嵌合作
業のときに複合スリーブの嵌入が難しくなるので、必然
的に制約される。The composite sleeve constructed as described above is fitted and fixed to the shaft material constituting the bearing portion or the like to obtain the assembly type rolling roll of the present invention. At this time, if the inner diameter of the composite sleeve, that is, the fitting diameter, is not larger than the diameter of the bearing portion, the fitting of the composite sleeve during the fitting operation becomes difficult, so that it is inevitably limited.
【0035】さらに、複合スリーブは回転軸と直角の断
面における「外層の断面積/内層の断面積」の値を0.7
以下にしておく必要がある。こうすることにより、複合
スリーブの外層は如何なる直径の時点で圧延に使用され
ても、常に200MPa以上の圧縮応力が付与された状態にな
る。この結果、異常圧延等により表面に引張応力が作用
して亀裂が発生するような事態に遭遇しても、圧縮応力
により打ち消されるので、亀裂の発生が阻止される。圧
縮応力が200MPa未満のときは容易に亀裂が発生する。こ
の圧縮応力は複合スリーブが本来有している外層の円周
方向残留応力と嵌合により外層に作用する円周方向嵌合
応力との合成応力である。Further, in the composite sleeve, the value of "the cross-sectional area of the outer layer / the cross-sectional area of the inner layer" in the cross section perpendicular to the rotation axis is 0.7.
You need to keep it below. By doing so, the outer layer of the composite sleeve is always subjected to a compressive stress of 200 MPa or more regardless of the diameter of the outer layer used for rolling. As a result, even if a situation occurs in which a tensile stress acts on the surface due to abnormal rolling or the like to cause a crack, it is canceled by the compressive stress, so the occurrence of a crack is prevented. When the compressive stress is less than 200 MPa, cracks easily occur. This compressive stress is a combined stress of the circumferential residual stress of the outer layer originally possessed by the composite sleeve and the circumferential fitting stress acting on the outer layer by fitting.
【0036】このように、本発明の組立式圧延用ロール
は複合スリーブの外層と内層の断面積、即ち胴部の直径
に制約されるので、外層の厚みを従来の一体式複合ロー
ルのように大きくできない点が相違する。本発明の組立
式圧延用ロールの態様は、複合スリーブの外層の断面積
を小さくするために、外層の使用開始の初径を従来ロー
ルと同等にして使用終了の廃却径を従来ロールよりも大
きくしたり、初径を小さくして廃却径を従来ロールと同
等にしたり、そのときの状況に応じて適宜実施できる。
しかしなるべく、初径を従来ロールと同様に大きくして
廃却径を大きくする方、即ち複合スリーブの内層の断面
積を大きくする方が、複合スリーブの強靱性が確保でき
るので好ましい。As described above, the prefabricated rolling roll of the present invention is restricted by the cross-sectional areas of the outer layer and the inner layer of the composite sleeve, that is, the diameter of the body portion. The difference is that it cannot be increased. Aspects of the roll for assembling rolling of the present invention, in order to reduce the cross-sectional area of the outer layer of the composite sleeve, the outer diameter of the outer layer is the same as the conventional roll at the beginning diameter of the start of use and the waste diameter at the end of use is larger than that of the conventional roll. The diameter can be increased or the initial diameter can be decreased to make the discarded diameter equal to that of the conventional roll, or can be appropriately performed depending on the situation at that time.
However, it is preferable to increase the initial diameter in the same manner as the conventional roll to increase the waste diameter, that is, to increase the cross-sectional area of the inner layer of the composite sleeve because the toughness of the composite sleeve can be secured.
【0037】[0037]
【実施例】図1は本発明実施例ロールを説明する回転軸
方向の断面図、図2は同じく回転軸と直角方向の胴部の
断面図である。これらの図において、外層1と内層2と
が金属的に接合された胴部形成用の複合スリーブは軸受
部4以上の直径にて軸材3に焼嵌めにより嵌合固定され
ている。軸受部4のさらに端側には、軸受部4よりも直
径の小さい駆動部5がある。実施例として、表1に示す
No.1とNo.2の連続熱間薄板圧延用ロールを対象とし、そ
れぞれについて実施例 1及び 2と、それらを比較するた
めの比較例 1及び 2の組立式圧延用ロールを製作した。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a roll according to an embodiment of the present invention in the direction of a rotation axis, and FIG. In these figures, a body-forming composite sleeve in which the outer layer 1 and the inner layer 2 are metallically joined is fitted and fixed to the shaft member 3 by shrink fitting with a diameter of the bearing portion 4 or more. A drive unit 5 having a smaller diameter than the bearing unit 4 is provided on the further end side of the bearing unit 4. As an example, shown in Table 1
Targeting the No. 1 and No. 2 continuous hot strip rolling rolls, the assembling type rolling rolls of Examples 1 and 2 and Comparative Examples 1 and 2 for comparing them were manufactured.
【0038】[0038]
【表1】 [Table 1]
【0039】製作した各例複合スリーブの化学成分を表
2に示す。外層材質は何れも本発明の成分系であり、内
層材質は実施例 1と比較例 1がJIS-G-4105 SCM-440相当
の鍛鋼、実施例 2と比較例 2が黒鉛鋳鋼である。また、
実施例 1と比較例 1の複合スリーブは、中空円筒状に形
成した上記鍛鋼製の軸材を用い、例えばWO88/07594号公
報記載の方法と類似の連続肉盛鋳造法、実施例 2と比較
例 2は例えば特開昭50-3922号公報記載の方法と類似の
遠心力鋳造法により製作した。Table 2 shows the chemical components of the manufactured composite sleeves. The outer layer material is the component system of the present invention, and the inner layer material is Example 1 and Comparative Example 1 forged steel equivalent to JIS-G-4105 SCM-440, and Example 2 and Comparative Example 2 is graphite cast steel. Also,
The composite sleeves of Example 1 and Comparative Example 1 use the forged steel shaft material formed in a hollow cylindrical shape, for example, a continuous overlay casting method similar to the method described in WO88 / 07594, and compared with Example 2. Example 2 was produced by, for example, a centrifugal casting method similar to the method described in Japanese Patent Laid-Open No. 50-3922.
【0040】外層材質を鋳造するに際して、黒鉛を晶出
させるため、各例組成の接種前溶湯にSi含有の接種剤を
用いて接種した。接種剤はFe-Si系合金よりもCa-Si系合
金の方が、良好な黒鉛晶出が得られるので好ましい。各
例においては、Ca-60%Si合金を用い、表2に示すSi量
の接種をした。実施例 1と比較例 1は連続肉盛鋳造作業
中に鋳造しながら耐火枠内の溶湯中へ、実施例 2と比較
例 2は遠心力鋳造作業中に鋳造しながら湯受け内の溶湯
中へ接種した。When casting the material of the outer layer, in order to crystallize graphite, the molten metal before inoculation of each composition was inoculated with an inoculum containing Si. As the inoculant, a Ca-Si alloy is preferable to an Fe-Si alloy because good graphite crystallization can be obtained. In each example, Ca-60% Si alloy was used and inoculated with the amount of Si shown in Table 2. Example 1 and Comparative Example 1 were cast into the molten metal in the refractory frame while casting during the continuous build-up casting operation, and Example 2 and Comparative Example 2 were cast into the molten metal in the hot pan while casting during the centrifugal casting operation. I inoculated.
【0041】[0041]
【表2】 [Table 2]
【0042】鋳造した各例の複合スリーブに、所定の熱
処理と表3に示す諸元の加工を施した。これらの複合ス
リーブの外層の硬さ、黒鉛面積比、MC炭化物面積比、MC
炭化物以外の他形態炭化物の面積比を表4に示す。表3
より、各実施例は如何なる直径の外径時点においても
「外層断面積/内層断面積」の値が0.7以下であるが、各
比較例は初径時点で0.7を越え、使用することにより複
合スリーブの外径が小さくなった時点で0.7以下にな
る。The cast composite sleeves of the respective examples were subjected to predetermined heat treatment and processing of the specifications shown in Table 3. Hardness of outer layers of these composite sleeves, graphite area ratio, MC carbide area ratio, MC
Table 4 shows the area ratio of other form carbides than the carbides. Table 3
Therefore, in each example, the value of "outer layer cross-sectional area / inner layer cross-sectional area" is 0.7 or less at any outer diameter point, but each comparative example exceeds 0.7 at the initial diameter point, and the composite sleeve It becomes 0.7 or less when the outer diameter of becomes smaller.
【0043】[0043]
【表3】 [Table 3]
【0044】[0044]
【表4】 [Table 4]
【0045】各例の組立式圧延用ロールについて、外層
表面に作用している円周方向の圧縮応力の検討結果を表
6に示す。この圧縮応力は、複合スリーブの外層が本来
有していた円周方向の残留応力σ11と、焼嵌めにより発
生した円周方向の焼嵌め応力σ12とを合成した応力σ15
である。残留応力σ11は、各例と同等の複合スリーブを
それぞれ別に2個製作し、歪ゲージを貼付後その部分を4
0mm×40mm×40mmのブロックに切断して、開放法により
測定した値である。焼嵌め応力σ12は、表3と表5に示
す諸元を基にし、一般的に知られている厚肉円筒の計算
式を用いて計算により求めた値である。焼嵌め率は組立
式圧延用ロールに一般的に採用されている値を用いた
が、この値を変えることによっても圧縮応力は若干変動
する。Table 6 shows the examination results of the circumferential compressive stress acting on the surface of the outer layer of the assembling rolling roll of each example. This compressive stress is a stress σ 15 that is a combination of the residual stress σ 11 in the circumferential direction originally possessed by the outer layer of the composite sleeve and the shrinkage fitting stress σ 12 in the circumferential direction generated by shrink fitting.
Is. Residual stress σ 11 was obtained by manufacturing two composite sleeves, each of which is equivalent to each example, and applying a strain gauge to the part
It is a value measured by the open method after cutting into a block of 0 mm x 40 mm x 40 mm. The shrink-fitting stress σ 12 is a value obtained by calculation using a generally known calculation formula for a thick-walled cylinder based on the specifications shown in Tables 3 and 5. As the shrinkage fitting rate, a value generally adopted for the assembling type rolling roll was used, but the compressive stress is slightly changed by changing this value.
【0046】[0046]
【表5】 [Table 5]
【0047】[0047]
【表6】 [Table 6]
【0048】表6により、本発明の実施例ロールは何れ
も使用外層が如何なる直径のときでも200MPaをはるかに
越えた圧縮応力を有しているので、耐亀裂性が付与さ
れ、材質が本来有している耐亀裂性に加えて、焼嵌めに
よりさらに十分な耐亀裂性を有するものとなっている。
比較例ロールは使用により外径が小さくなって廃却径に
近づくと200MPaを越えるが、直径が大きい使用開始の初
径近くでは200MPa未満のため、耐亀裂性が十分といえな
い。According to Table 6, since all the rolls of the present invention have a compressive stress far exceeding 200 MPa regardless of the diameter of the outer layer used, crack resistance is imparted and the material is originally present. In addition to the existing crack resistance, shrink fitting provides more sufficient crack resistance.
The comparative roll has a smaller outer diameter due to use, and exceeds 200 MPa as it approaches the waste diameter, but it has a large diameter and is less than 200 MPa near the initial diameter at the start of use, so crack resistance cannot be said to be sufficient.
【0049】以上は外層の耐亀裂性に注目して検討した
が、さらに複合スリーブでは、内層の肉厚が薄くなると
引張残留応力が増加して、圧延に使用中に複合スリーブ
の内面、即ち焼嵌め面から割損するか又は塑性変形によ
り焼嵌め率が低下することがある。このため、複合スリ
ーブの内面に発生する円周方向の引張応力についての検
討を加えた。In the above, the crack resistance of the outer layer was paid attention to. Further, in the composite sleeve, the tensile residual stress increases as the thickness of the inner layer becomes thinner, and the inner surface of the composite sleeve, that is, the sintered sleeve, is used during rolling. The shrinkage rate may decrease due to fracture from the fitting surface or plastic deformation. Therefore, we examined the tensile stress in the circumferential direction generated on the inner surface of the composite sleeve.
【0050】各例の組立式圧延用ロールについて、内層
の内表面、即ち焼嵌め面に作用している円周方向の引張
応力検討結果を表6に併記する。この引張応力は、複合
スリーブの内層が本来有していた円周方向の残留応力σ
21と、焼嵌めにより発生した円周方向の焼嵌め応力σ22
と、使用中の圧延荷重により加わる円周方向の圧延応力
σ23と、同じく熱により加わる円周方向の熱応力σ24と
を合成した応力σ25である。残留応力σ21は、前述同様
別に製作した各例同等の複合スリーブの内面を旋削加工
して、ザックス法により測定した値である。焼嵌め応力
σ22は、表3と表5に示す諸元を基にして、前述同様計
算により求めた値である。焼嵌め率も前述同様である。Table 6 also shows the results of examination of the tensile stress in the circumferential direction acting on the inner surface of the inner layer, that is, the shrink-fitted surface of the roll for assembling type rolling of each example. This tensile stress is due to the residual stress σ in the circumferential direction originally possessed by the inner layer of the composite sleeve.
21 and the shrinkage stress σ 22 in the circumferential direction generated by shrinkage fitting.
And a rolling stress σ 23 in the circumferential direction applied by the rolling load during use and a thermal stress σ 24 in the circumferential direction also applied by heat, which is a stress σ 25 . The residual stress σ 21 is a value measured by the Sachs method after turning the inner surface of a composite sleeve which is produced separately as in the above example and is equivalent to each example. The shrink fitting stress σ 22 is a value obtained by the same calculation as described above based on the specifications shown in Tables 3 and 5. The shrink fitting rate is also the same as described above.
【0051】圧延応力σ23は、模型ロールの実験結果か
ら得た次の実験式により求めた。
σ23={3.6-0.6(r2/r1)}・{P/(π・r1・L)}
σ23:圧延応力〔=合成応力〕(MPa)
P :圧延荷重 (kN)
r1 :複合スリーブの内面半径〔=焼嵌め面半径〕(mm)
r2 :複合スリーブの外表面半径 (mm)
L :複合スリーブの長さ〔=焼嵌め面の長さ〕(mm)The rolling stress σ 23 was obtained by the following empirical formula obtained from the experimental results of the model roll. σ 23 = {3.6-0.6 (r 2 / r 1 )} ・ {P / (π ・ r 1・ L)} σ 23 : Rolling stress (= composite stress) (MPa) P: Rolling load (kN) r 1 : Inner surface radius of composite sleeve [= shrink fitting surface radius] (mm) r 2 : Outer surface radius of composite sleeve (mm) L: Composite sleeve length [= shrink fitting surface length] (mm)
【0052】熱応力σ24は、温度分布T(r)が与えられた
ときの一般的熱応力式を基にし、複合スリーブの内面に
対して外表面の温度が△T℃だけ高くなると仮定した次
式により求めた。
σ24={(α・E)/(1-ν)}・{△T/3}・{〔2r2+r1)/(r2+r1)}
σ24:熱応力〔=合成応力〕(MPa)
α :複合スリーブの熱膨張係数=1.2×10-5 (1/℃)
E :複合スリーブの弾性係数=21×104 (MPa)
ν :複合スリーブのポアソン比=0.3
△T:複合スリーブの外面と内面の温度差=40 (℃)
r1 :複合スリーブの内面半径〔=焼嵌め面半径〕(mm)
r2 :複合スリーブの外表面半径 (mm)The thermal stress σ 24 is based on the general thermal stress equation when the temperature distribution T (r) is given, and it is assumed that the temperature of the outer surface becomes higher than the inner surface of the composite sleeve by ΔT ° C. It was calculated by the following formula. σ 24 = {(α ・ E) / (1-ν)} ・ {△ T / 3} ・ {[2r 2 + r 1 ) / (r 2 + r 1 )} σ 24 : Thermal stress [= synthetic stress ] (MPa) α: Thermal expansion coefficient of composite sleeve = 1.2 × 10 -5 (1 / ° C) E: Elastic coefficient of composite sleeve = 21 × 10 4 (MPa) ν: Poisson's ratio of composite sleeve = 0.3 ΔT: Temperature difference between outer surface and inner surface of compound sleeve = 40 (℃) r 1 : Inner surface radius of compound sleeve [= shrink fitting surface radius] (mm) r 2 : Outer surface radius of compound sleeve (mm)
【0053】本発明の実施例 1と比較例 1の複合スリ
ーブの内層材は、鍛鋼であり、引張強さは735MPaであ
る。同じく実施例 2と比較例 2は、黒鉛鋳鋼であり、引
張強さは588MPaである。これらの内層材質が有している
強さと表6の複合スリーブ内面に発生する応力とを比較
すると、本発明の実施例ロールは何れも、使用外層が如
何なる直径のときでも、発生する引張応力に比べてはる
かに大きい強さを有するので、割損に対して安全であ
る。これに対して、比較例ロールは、使用により外径が
小さくなって廃却径近くになると、残留応力が小さくな
ることにより内面の合成応力が小さくなり、割損や内面
の塑性変形の危険がなくなるが、直径が大きい使用開始
の初径近くでは、残留応力が大きいことにより合成応力
が引張強さ以上又はそれに近くなり、割損や内面の塑性
変形の危険がある。The inner layer material of the composite sleeves of Example 1 and Comparative Example 1 of the present invention is forged steel, and the tensile strength is 735 MPa. Similarly, Example 2 and Comparative Example 2 are made of graphite cast steel and have a tensile strength of 588 MPa. Comparing the strength possessed by these inner layer materials with the stress generated on the inner surface of the composite sleeve in Table 6, it can be seen that the rolls of the examples of the present invention are It has a much greater strength compared to it and is therefore safe against fracture. On the other hand, in the comparative example roll, when the outer diameter becomes small due to use and becomes close to the discarded diameter, the residual stress becomes small and the combined stress of the inner surface becomes small, and there is a risk of fracture and plastic deformation of the inner surface. However, since the residual stress is large near the initial diameter at the start of use where the diameter is large, the composite stress becomes equal to or higher than the tensile strength or is close to it, and there is a risk of fracture and plastic deformation of the inner surface.
【発明の効果】本発明の組立式圧延用ロールは、材質が
本来有する耐摩耗性、耐焼付き性に優れる共に、十分な
耐亀裂性を有し、かつ耐割損性を有している。その結
果、圧延に用いて異常事態が発生してもロールの受ける
被害が阻止されるので、それに基づく圧延機の停止やロ
ールの損害が抑制される。EFFECTS OF THE INVENTION The assembling type rolling roll of the present invention is excellent in abrasion resistance and seizure resistance inherent in the material, and has sufficient crack resistance and fracture resistance. As a result, even if an abnormal situation occurs during rolling, damage to the rolls is prevented, so that the rolling mill is stopped and the rolls are prevented from being damaged.
【図1】本発明実施例ロールを説明する回転軸方向の断
面図である。FIG. 1 is a cross-sectional view of a roll according to an embodiment of the present invention in a rotation axis direction.
【図2】本発明実施例ロールを説明する回転軸と直角方
向の胴部の断面図である。FIG. 2 is a cross-sectional view of a body part of a roll according to an embodiment of the present invention in a direction perpendicular to a rotation axis.
1:外層 2:内層 3:軸材 4:軸受
部 5:駆動部1: Outer layer 2: Inner layer 3: Shaft material 4: Bearing part 5: Drive part
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) C22C 1/00 - 49/14 B21B 27/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. 7 , DB name) C22C 1/00-49/14 B21B 27/00
Claims (3)
て、胴部構成用複合スリーブは遠心力鋳造法、連続肉盛
鋳造法、静置鋳造法のうちいずれかの鋳造法で製作さ
れ、重量比でC:2〜4%、Si:0.5〜4%、Mn:0. 1〜1.5
%、Cr:1〜7%、Mo:2〜10%、V:2〜10%の化学成分を含
み残部が実質的にFe及び不可避的不純物からなり、金属
組織は基地組織と面積比で0.5〜5%の黒鉛と0.2〜10%
のMC系炭化物と40%以下のセメンタイトとを含み、硬さ
がHS:70以上の外層と、重量比でC:0.1〜2%を含む鋳鋼
又は鍛鋼又は黒鉛鋳鋼の内層とを金属的に接合した胴部
構成用複合スリーブを軸材に嵌合固定されてなり、胴部
構成用複合スリーブは、回転軸と直角の断面における
「外層の断面積/内層の断面積」の値が0.7以下で、内
径が軸材の軸受部の直径以上であることを特徴とする組
立式圧延用ロール。1. A working roll for a continuous hot strip mill.
The composite sleeve for body part is made by centrifugal casting, continuous overlay
Manufactured by either casting method or stationary casting method
By weight ratio, C: 2-4%, Si: 0.5-4%, Mn: 0.1-1.5
%, Cr: 1~7%, Mo : 2~10%, V: 2 to 10% of the chemical components containing
The balance consists essentially of Fe and unavoidable impurities , and the metal structure has a matrix structure with an area ratio of 0.5 to 5% graphite and 0.2 to 10%.
Of MC-based carbide and 40% or less of cementite, and the hardness is HS: 70 or more of the outer layer, and C: 0.1 to 2% by weight of the cast steel or forged steel or graphite cast steel containing the inner layer is metallically joined The body section composite sleeve is fitted and fixed to the shaft material, and the body section composite sleeve has a value of “outer layer cross-sectional area / inner layer cross-sectional area” of 0.7 or less in a cross section perpendicular to the rotation axis. An assembly type rolling roll having an inner diameter equal to or larger than a diameter of a bearing portion of a shaft material.
織は、MC系炭化物以外にさらにM2C系炭化物、M6C系炭化
物、M7C3系炭化物の何れか1種以上を面積比で0.2〜20
%含むことを特徴とする請求項1記載の組立式圧延用ロ
ール。2. The metal structure of the outer layer of the composite sleeve for forming a body portion is, in addition to MC type carbide, an area of at least one of M 2 C type carbide, M 6 C type carbide and M 7 C 3 type carbide. 0.2 to 20 in comparison
%, The prefabricated rolling roll according to claim 1.
に重量比でNi:0.2〜4%、W:2〜10%、Co:1〜10%、Nb:1
〜10%、Ti:0.01〜2%、B:0.002〜0.2%、Cu:0.02〜1%
の内の何れか1種以上を含むことを特徴とする請求項1
又は請求項2記載の組立式圧延用ロール。3. The outer layer of the composite sleeve for forming the body part further comprises Ni: 0.2 to 4%, W: 2 to 10%, Co: 1 to 10%, Nb: 1 by weight ratio.
~ 10%, Ti: 0.01-2%, B: 0.002-0.2%, Cu: 0.02-1%
2. Any one or more of the above are included.
Alternatively, the prefabricated rolling roll according to claim 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23697694A JP3468381B2 (en) | 1994-09-30 | 1994-09-30 | Assembling type roll |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23697694A JP3468381B2 (en) | 1994-09-30 | 1994-09-30 | Assembling type roll |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08100241A JPH08100241A (en) | 1996-04-16 |
JP3468381B2 true JP3468381B2 (en) | 2003-11-17 |
Family
ID=17008557
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23697694A Expired - Lifetime JP3468381B2 (en) | 1994-09-30 | 1994-09-30 | Assembling type roll |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3468381B2 (en) |
-
1994
- 1994-09-30 JP JP23697694A patent/JP3468381B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH08100241A (en) | 1996-04-16 |
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