JP4787640B2 - Composite roll for rolling - Google Patents
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- JP4787640B2 JP4787640B2 JP2006074229A JP2006074229A JP4787640B2 JP 4787640 B2 JP4787640 B2 JP 4787640B2 JP 2006074229 A JP2006074229 A JP 2006074229A JP 2006074229 A JP2006074229 A JP 2006074229A JP 4787640 B2 JP4787640 B2 JP 4787640B2
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- 239000002131 composite material Substances 0.000 title claims description 35
- 238000005096 rolling process Methods 0.000 title claims description 28
- 239000000463 material Substances 0.000 claims description 70
- 239000011162 core material Substances 0.000 claims description 67
- 229910052804 chromium Inorganic materials 0.000 claims description 25
- 229910052750 molybdenum Inorganic materials 0.000 claims description 23
- 229910052720 vanadium Inorganic materials 0.000 claims description 22
- 239000012535 impurity Substances 0.000 claims description 20
- 229910052759 nickel Inorganic materials 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 15
- 229910052748 manganese Inorganic materials 0.000 claims description 15
- 229910052758 niobium Inorganic materials 0.000 claims description 12
- 229910001018 Cast iron Inorganic materials 0.000 claims description 11
- 229910052721 tungsten Inorganic materials 0.000 claims description 10
- 229910052719 titanium Inorganic materials 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 50
- 239000010439 graphite Substances 0.000 description 50
- 229910002804 graphite Inorganic materials 0.000 description 50
- 239000011651 chromium Substances 0.000 description 21
- 230000000694 effects Effects 0.000 description 15
- 238000007711 solidification Methods 0.000 description 15
- 230000008023 solidification Effects 0.000 description 15
- 238000002425 crystallisation Methods 0.000 description 14
- 230000008025 crystallization Effects 0.000 description 14
- 238000005266 casting Methods 0.000 description 10
- 150000001247 metal acetylides Chemical class 0.000 description 10
- 238000005087 graphitization Methods 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000009750 centrifugal casting Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 230000002401 inhibitory effect Effects 0.000 description 4
- 230000000670 limiting effect Effects 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000002054 inoculum Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
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- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Description
本発明は、鉄鋼の熱間圧延又は冷間圧延用の複合ロールに関する。 The present invention relates to a composite roll for hot rolling or cold rolling of steel.
鉄鋼の圧延用複合ロールとして、圧延材に接する外層(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、芯材を強靱性にすぐれるダクタイル鋳鉄材から形成したものが使用されている。
ハイス系鋳鉄材は、Ｃｒ、Ｖ、Ｍｏ、Ｗ等の合金元素を多く含んでおり、これら元素がＣと結合して炭化物を晶出することにより、すぐれた耐摩耗性を発揮する。また、ダクタイル鋳鉄材は、球状化黒鉛を晶出することにより、すぐれた強靱性を発揮する。
As a composite roll for steel rolling, the outer layer (working layer) in contact with the rolled material is formed from a high-speed cast iron material with excellent wear resistance, and the core material is formed from a ductile cast iron material with excellent toughness. ing.
The high-speed cast iron material contains a large amount of alloy elements such as Cr, V, Mo and W, and these elements combine with C to crystallize carbides, thereby exhibiting excellent wear resistance. Ductile cast iron exhibits excellent toughness by crystallizing spheroidized graphite.
この複合ロールの製作は、一般的には、外層を遠心力鋳造にて鋳造し、外層の凝固が完了した後、又は凝固途中に遠心力回転を停止し、次に、芯材を静置鋳造することにより行われ、外層と芯材は冶金学的に一体化される。
複合ロールには、外層と芯材の間に中間層を設けるものがある。この場合、外層の凝固完了後又は凝固途中に中間層を遠心力鋳造し、中間層の凝固が完了した後、又は凝固途中に遠心力回転を停止し、次に、芯材を静置鋳造することにより、外層、中間層及び芯材が冶金学的に一体化された複合ロールが製作される。
In general, the composite roll is manufactured by casting the outer layer by centrifugal casting, and after the solidification of the outer layer is completed or during the solidification, the centrifugal force rotation is stopped, and then the core material is statically cast. The outer layer and the core material are integrated metallurgically.
Some composite rolls provide an intermediate layer between an outer layer and a core material. In this case, after the solidification of the outer layer is completed or during the solidification, the intermediate layer is subjected to centrifugal force casting. After the solidification of the intermediate layer is completed or during the solidification, the centrifugal force rotation is stopped, and then the core material is statically cast. Thus, a composite roll in which the outer layer, the intermediate layer, and the core material are integrated metallurgically is manufactured.
ところで、芯材のダクタイル鋳鉄材は、黒鉛の球状化が不十分であったり、チャンキー黒鉛と称される異常黒鉛が発生すると、強度の低下を招く。 By the way, the ductile cast iron material of the core material causes a decrease in strength when the spheroidization of graphite is insufficient or abnormal graphite called chunky graphite is generated.
芯材にＣｒ、Ｖ、Ｍｏ、Ｗ等の炭化物生成元素が含まれると、炭化物が形成され、Ｃが炭化物の生成に消費される結果、黒鉛化が阻害される。また、炭化物量が増加すれば、芯材が硬く脆くなる不都合がある。しかしながら、冶金学的一体化の過程で、外層の合金成分が、直接又は中間層を介して、芯材へ混入することは不可避である。
一方、黒鉛化促進のために、Ｓｉ、Ｎｉ等の黒鉛化促進元素を添加するとチャンキー黒鉛の発生を招く。特に、熱間圧延用ロールは、一般的には、約０.５トン〜１６トンもある大型鋳造品であり、芯材鋳造時の凝固速度が遅いため、チャンキー黒鉛が発生し易い傾向にある。
If the core material contains a carbide generating element such as Cr, V, Mo, W, etc., carbide is formed, and as a result of C being consumed for the generation of carbide, graphitization is inhibited. Further, if the amount of carbide increases, the core material becomes hard and brittle. However, it is inevitable that the alloy component of the outer layer is mixed into the core material directly or through the intermediate layer in the process of metallurgical integration.
On the other hand, when graphitization promoting elements such as Si and Ni are added to promote graphitization, chunky graphite is generated. In particular, the hot rolling roll is generally a large cast product of about 0.5 to 16 tons, and the solidification rate at the time of casting the core material is slow, so that it tends to easily generate chunky graphite. is there.
圧延用複合ロールの芯材に用いられるダクタイル鋳鉄材の黒鉛を制御する技術として、Ｂｉを含有させるものがある(特許文献１及び特許文献２)。また、Ｂｉと共にＳｎを同時に添加するものがある(特許文献３)。 As a technique for controlling the graphite of the ductile cast iron material used for the core material of the composite roll for rolling, there is one that contains Bi (Patent Document 1 and Patent Document 2). In addition, there is one in which Sn is added simultaneously with Bi (Patent Document 3).
特許文献１及び特許文献２のダクタイル鋳鉄材は、Ｂｉによって黒鉛を微細化し、黒鉛粒数を増加させるものであるが、大型複合ロールの芯材のように凝固速度が遅い場合、黒鉛の微細効果が不十分であり、チャンキー黒鉛を晶出する問題がある。
特許文献３のダクタイル鋳鉄材は、大型複合ロールの芯材のように凝固速度が遅い場合でも黒鉛の微細晶出効果が得られるように、Ｂｉと同時にＳｎを適量含有させるものであるが、チャンキー黒鉛の晶出を完全に抑制するには不十分である。
Ｓｂは、黒鉛球状化の阻害作用が特に強い元素であるから、これまで、圧延用複合ロールの芯材を構成するダクタイル鋳鉄材に用いられたことはなかった。
The ductile cast iron materials of Patent Document 1 and Patent Document 2 refine graphite by Bi and increase the number of graphite grains. However, when the solidification rate is slow like the core material of a large composite roll, the fine effect of graphite Is insufficient, and there is a problem of crystallizing chunky graphite.
The ductile cast iron material of Patent Document 3 contains Sn in an appropriate amount at the same time as Bi so that a fine crystallization effect of graphite can be obtained even when the solidification rate is slow like the core material of a large composite roll. It is insufficient to completely suppress crystallization of key graphite.
Since Sb is an element that has a particularly strong inhibitory effect on the spheroidizing of graphite, it has never been used for a ductile cast iron material constituting the core material of a composite roll for rolling.
それゆえ、本発明の技術的課題は、外層にハイス系鋳鉄材、芯材にダクタイル鋳鉄材を用いた圧延用複合ロールにおいて、芯材におけるチャンキー黒鉛の晶出を防止した圧延用複合ロールを提供することである。 Therefore, the technical problem of the present invention is to provide a composite roll for rolling using a high-speed cast iron material for the outer layer and a ductile cast iron material for the core material. Is to provide.
本発明の圧延用複合ロールは、耐摩耗性にすぐれるハイス系鋳鉄材からなる外層の内側に、強靱性にすぐれるダクタイル鋳鉄の芯材が鋳造され、外層と芯材は冶金学的に一体化されており、外層は、重量％にて、Ｃ：１.０〜２.５％、Ｓｉ：０.２〜１.２％、Ｍｎ：０.２〜１.２％、Ｎｉ：０.０５〜３.０％、Ｃｒ：２.０〜８.０％、Ｖ：２.０〜８.０％を含有すると共に、Ｍｏ：１.４３〜８.０％及び／又はＷ：０.０５〜５.０％を含有し、残部Ｆｅ及び不可避の不純物からなり、芯材は、重量％にて、Ｃ：２.８〜４.０％、Ｓｉ：１.５〜４.５％、Ｍｎ：０.３〜１.０％、Ｎｉ：０.０５〜３.０％、Ｍｇ：０.０１〜０.１％、Ｓｂ：０.００１〜０.１％を含有し、Ｃｒ、Ｖ、Ｍｏ及びＷの含有量は合計量で４.０重量％以下であり、残部Ｆｅ及び不可避の不純物からなる。 In the composite roll for rolling of the present invention, a core material of ductile cast iron with excellent toughness is cast inside an outer layer made of high-speed cast iron material with excellent wear resistance, and the outer layer and the core material are integrated metallurgically. The outer layer is, by weight%, C: 1.0 to 2.5%, Si: 0.2 to 1.2%, Mn: 0.2 to 1.2%, Ni: 0.2%. Containing 0.5 to 3.0%, Cr: 2.0 to 8.0%, V: 2.0 to 8.0%, Mo: 1.43 to 8.0% and / or W: 0.0. Containing 05-5.0%, consisting of the balance Fe and inevitable impurities, the core material is C: 2.8-4.0%, Si: 1.5-4.5% in weight%, Mn: 0.3~1.0%, Ni: 0.05~3.0 %, Mg: 0.0 1 ~0.1%, Sb: containing 0.001 to 0.1%, Cr, The total content of V, Mo and W is 4.0% by weight or less, and the balance is Fe and Consisting of impurities of the variable avoided.
外層は、所望により、重量％にて、Ｔｉ：０.５％、Ｎｂ：２.０％以下及びＣｏ：５.０％以下の少なくとも１種をさらに含有することができ、その場合、芯材は、Ｃｒ、Ｖ、Ｍｏ、Ｗ、Ｔｉ及びＮｂの含有量が合計量で４.０重量％以下である。 The outer layer can further contain at least one of Ti: 0.5%, Nb: 2.0% or less, and Co: 5.0% or less in weight%, if desired. Has a total content of Cr, V, Mo, W, Ti and Nb of 4.0% by weight or less.
芯材は、所望により、重量％にて、Ｓｎ：０.００１〜０.１３％及び／又はＢｉ：０.０００３〜０.１％を含有することができる。 The core material, optionally, at wt%, Sn: 0.001~0.13% and / or Bi: may contain 0.000 from 3 to 0.1%.
外層と芯材の間に中間層を鋳造することもでき、外層、中間層及び芯材は冶金学的に一体化される。中間層の例として、重量％にて、Ｃ：１.５〜２.５％、Ｓｉ：０.２〜１.２％、Ｍｎ：０.２〜１.２％、Ｎｉ：０.０５〜３.０％、Ｃｒ：０.５〜４.０％、Ｖ：１.０〜４.０％を含有すると共に、Ｍｏ：０.５〜４.０％及び／又はＷ：０.０５〜３.０％を含有し、残部Ｆｅ及び不可避の不純物からなるもの、又は、重量％にて、Ｃ：１.０〜２.５％、Ｓｉ：０.５〜２.０％、Ｍｎ：０.２〜１.２％、Ｎｉ：０.０５〜３.０％、Ｃｒ：０.５〜４.０％、Ｖ：１.０〜４.０％を含有すると共に、Ｍｏ：０.５〜４.０％及び／又はＷ：０.０５〜３.０％を含有し、残部Ｆｅ及び不可避の不純物からなるものを挙げることができる。 An intermediate layer may be cast between the outer layer and the core material, and the outer layer, the intermediate layer, and the core material are integrated metallurgically. As an example of the intermediate layer, by weight%, C: 1.5 to 2.5%, Si: 0.2 to 1.2%, Mn: 0.2 to 1.2%, Ni: 0.05 to 3.0%, Cr: 0.5-4.0%, V: 1.0-4.0%, Mo: 0.5-4.0% and / or W: 0.05- Containing 3.0%, balance Fe and inevitable impurities, or by weight, C: 1.0 to 2.5%, Si: 0.5 to 2.0%, Mn: 0 0.2 to 1.2%, Ni: 0.05 to 3.0%, Cr: 0.5 to 4.0%, V: 1.0 to 4.0%, and Mo: 0.5 -4.0% and / or W: 0.05-3.0%, and what consists of remainder Fe and an unavoidable impurity can be mentioned.
中間層は、所望により、重量％にて、Ｔｉ：０.３％以下、Ｎｂ：１.０％以下及びＣｏ：３.０％以下の少なくとも１種をさらに含有することができる。
この場合、芯材は、Ｃｒ、Ｖ、Ｍｏ、Ｗ、Ｔｉ及びＮｂの含有量が合計量で４.０重量％以下である。
The intermediate layer may further contain at least one of Ti: 0.3% or less, Nb: 1.0% or less, and Co: 3.0% or less, by weight, if desired.
In this case, the core material has a total content of Cr, V, Mo, W, Ti, and Nb of 4.0% by weight or less.
ダクタイル鋳鉄材からなる本発明の圧延用複合ロールの芯材は、炭化物生成元素の芯材への混入を可及的に少なく抑えられており、また、適量のＳｉ、Ｎｉを含有することにより黒鉛化が促進され、適量のＭｇを含有することにより良好な球状化状態が有する黒鉛を晶出させることができる。また、黒鉛の球状化に悪影響を及ぼさない範囲内でＳｂを含有させることにより、チャンキー黒鉛の晶出が阻止されるので、芯材はすぐれた強靱性を具備することができる。
従って、ハイス系材料による高耐摩耗性の外層と、強靱性にすぐれる芯材を有する圧延用複合ロールを提供することができる。
The core material of the composite roll for rolling according to the present invention made of a ductile cast iron material suppresses the mixing of carbide-forming elements into the core material as much as possible, and also contains graphite in an appropriate amount of Si and Ni. The graphite having a good spheroidized state can be crystallized by containing an appropriate amount of Mg. Further, by containing Sb within a range that does not adversely affect the spheroidization of graphite, crystallization of chunky graphite is prevented, so that the core material can have excellent toughness.
Therefore, it is possible to provide a composite roll for rolling having an outer layer with high wear resistance made of a high-speed material and a core material having excellent toughness.
本発明の圧延用複合ロールは、公知の如く、外層の凝固完了後又は凝固途中に、外層の内側に芯材が鋳造され、外層と芯材とが冶金学的に一体化される。或はまた、外層の凝固完了後又は凝固途中に、外層の内側に中間層が鋳造され、さらに中間層の凝固完了後又は凝固途中に、中間層の内側に芯材が鋳造され、外層、中間層及び芯材が冶金学的に一体化される。
外層及び中間層の鋳造は、遠心力鋳造法により行われ、芯材の鋳造は、静置鋳造法により行われる。遠心力鋳造法として、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、垂直方向の縦型の各種方法を適用することができる。
図１は、外層と芯材の間に中間層を有する鋳造後の複合ロールを示しており、(1)は外層、(2)は芯材、(3)は中間層である。
なお、本発明の圧延用複合ロールは、公知の如く、ロール鋳造後、所定の焼入れ及び焼戻しが施された後、機械加工を行ない、最終製品となる。
As is well known, in the composite roll for rolling of the present invention, after completion of solidification of the outer layer or during solidification, a core material is cast inside the outer layer, and the outer layer and the core material are integrated metallurgically. Alternatively, after completion of solidification of the outer layer or during solidification, an intermediate layer is cast inside the outer layer, and after completion of solidification of the intermediate layer or during solidification, a core material is cast inside the intermediate layer, and outer layer, intermediate The layer and the core are integrated metallurgically.
The outer layer and the intermediate layer are cast by a centrifugal casting method, and the core material is cast by a stationary casting method. As the centrifugal casting method, various methods can be applied, in which the rotation axis of the cylindrical mold is a horizontal type in the horizontal direction, an inclined type in the oblique direction, and a vertical type in the vertical direction.
FIG. 1 shows a composite roll after casting having an intermediate layer between an outer layer and a core material. (1) is an outer layer, (2) is a core material, and (3) is an intermediate layer.
As is well known, the composite roll for rolling of the present invention is machined after roll casting, after predetermined quenching and tempering, and becomes a final product.
外層を構成する材料として、耐摩耗性にすぐれるハイス系鋳鉄材が使用される。このハイス系鋳鉄材は、重量％にて、Ｃ：１.０〜２.５％、Ｓｉ：０.２〜１.２％、Ｍｎ：０.２〜１.２％、Ｎｉ：０.０５〜３.０％、Ｃｒ：２.０〜８.０％、Ｖ：２.０〜８.０％を含有すると共に、Ｍｏ：１.４３〜８.０％及び／又はＷ：０.０５〜５.０％を含有し、所望により、Ｔｉ：０.５％以下、Ｎｂ：２.０％以下及びＣｏ：５.０％以下の少なくとも１種をさらに含有し、残部Ｆｅ及び不可避の不純物からなる。 As a material constituting the outer layer, a high-speed cast iron material having excellent wear resistance is used. This high-speed cast iron material has a weight percentage of C: 1.0 to 2.5%, Si: 0.2 to 1.2%, Mn: 0.2 to 1.2%, Ni: 0.05. ~3.0%, Cr: 2.0~8.0%, V: with containing 2.0~8.0%, Mo: 1.43 ~8.0% and / or W: 0.05 -5.0%, optionally further containing at least one of Ti: 0.5% or less, Nb: 2.0% or less, and Co: 5.0% or less, the balance Fe and inevitable impurities Consists of.
外層を構成する前記ハイス系鋳鉄材の成分限定理由は次の通りである。
Ｃは、耐摩耗性を向上させるために１.０％以上含有させる。２.５％を超えると材質が脆くなるので、上限を２.５％とする。
Ｓｉは、脱酸作用及び湯流れ性を確保するために０.２％以上含有させる。しかし、１.２％を超えると焼入れ性が低下し、材質が脆くなるので、上限を１.２％とする。
Ｍｎは、Ｓと結合してＭｎＳを形成し、Ｓによる脆化を防止するために０.２％以上含有させる。１.２％を超えると材質が脆くなるので、上限を１.２％とする。
Ｎｉは、基地の強化を図るために０.０５％以上含有させる。しかし、３.０％を越えても含有量の増加に対応する効果を得られないので、上限を３.０％とする。
The reasons for limiting the components of the high-speed cast iron material constituting the outer layer are as follows.
C is contained by 1.0% or more in order to improve wear resistance. If the content exceeds 2.5%, the material becomes brittle, so the upper limit is set to 2.5%.
Si is contained in an amount of 0.2% or more in order to ensure deoxidation and hot water flow. However, if it exceeds 1.2%, the hardenability decreases and the material becomes brittle, so the upper limit is made 1.2%.
Mn combines with S to form MnS, and is contained in an amount of 0.2% or more in order to prevent embrittlement due to S. If the content exceeds 1.2%, the material becomes brittle, so the upper limit is made 1.2%.
Ni is contained in an amount of 0.05% or more in order to strengthen the base. However, even if it exceeds 3.0%, the effect corresponding to the increase in the content cannot be obtained, so the upper limit is made 3.0%.
Ｃｒは、Ｃと結合して炭化物を形成し、耐摩耗性を向上させるため、２.０％以上含有させる。一方、８.０％を超えると材質が脆くなるので、上限を８.０％とする。
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ため、２.０％以上含有させる。一方、８.０％を超えると偏析の防止が困難となるので、上限を８.０％とする。
ＭｏはＣと結合してＭ2Ｃ型又はＭ6Ｃ型の炭化物を形成し、耐摩耗性の向上に寄与するため、１.４３％以上含有させることが好ましい。一方、含有量があまりに多くなると残留オーステナイトが安定化し、高硬度が得られ難くなるので、上限を８.０％とする。
Ｗは、Ｍｏと同様、Ｃと結合してＭ2Ｃ型又はＭ6Ｃ型の炭化物を形成し、耐摩耗性の向上に寄与するため、０.０５％以上含有させることが好ましい。一方、５.０％を超えて含有すると材質が脆くなるので、上限を５.０％とする。
Ｔｉは、ＭＣ型炭化物を形成し、耐摩耗性の向上に寄与する他、溶湯中で酸化物を生成して、鋳造品質の健全性を向上させる作用を有するので含有することが好ましい。しかし、含有量が０.５％を超えると介在物が残留するので、上限は０.５％とする。
Ｎｂは、ＭＣ型炭化物を形成し、耐摩耗性の向上に寄与するので、含有することが好ましい。しかし、２.０％を超えて含有すると、偏析を発生し易くなるので上限を２.０％とする。
Cr is combined with C to form carbides and improves wear resistance, so 2.0% or more is contained. On the other hand, if it exceeds 8.0%, the material becomes brittle, so the upper limit is made 8.0%.
V is combined with C to form a high-hardness MC type carbide, and is contained in an amount of 2.0% or more in order to improve wear resistance. On the other hand, if it exceeds 8.0%, it becomes difficult to prevent segregation, so the upper limit is made 8.0%.
Mo combines with C to form M 2 C-type or M 6 C-type carbides and contributes to the improvement of wear resistance, so it is preferable to contain 1.43 % or more. On the other hand, when the content is too large, retained austenite is stabilized and it becomes difficult to obtain high hardness, so the upper limit is made 8.0%.
W, like Mo, combines with C to form M 2 C-type or M 6 C-type carbides and contributes to the improvement of wear resistance, so 0.05% or more is preferably contained. On the other hand, if the content exceeds 5.0%, the material becomes brittle, so the upper limit is made 5.0%.
Ti is preferably contained because it forms MC-type carbides and contributes to the improvement of wear resistance, and also generates oxides in the molten metal to improve the soundness of casting quality. However, if the content exceeds 0.5%, inclusions remain, so the upper limit is made 0.5%.
Nb is preferably contained because it forms MC-type carbides and contributes to improvement of wear resistance. However, if the content exceeds 2.0%, segregation tends to occur, so the upper limit is made 2.0%.
Ｃｏは、基地に固溶され、基地を強化する作用を有するので含有することが好ましい。しかし、５.０％を超えてても含有量の増加に対応する効果を得られないので、上限を５.０％とする。
なお、不純物元素であるＰ、Ｓは材質を脆くするため、できるだけ少ない方がよく、Ｐは０.１％以下、Ｓは０.０６％以下にすることが望ましい。
Co is preferably contained because it is dissolved in the matrix and has the effect of strengthening the matrix. However, even if it exceeds 5.0%, an effect corresponding to the increase in the content cannot be obtained, so the upper limit is made 5.0%.
Note that the impurity elements P and S are preferably as small as possible in order to make the material brittle, and it is desirable that P is 0.1% or less and S is 0.06% or less.
芯材を構成する材料として、強靱性にすぐれるダクタイル鋳鉄材が使用される。このダクタイル鋳鉄材は、重量％にて、Ｃ：２.８〜４.０％、Ｓｉ：１.５〜４.５％、Ｍｎ：０.３〜１.０％、Ｎｉ：０.０５〜３.０％、Ｍｇ：０.０１〜０.１％、Ｓｂ：０.００１〜０.１％を含有すると共に、所望により、Ｓｎ：０.００１〜０.１３％及び／又はＢｉ：０.０００３〜０.１％を含有し、Ｃｒ、Ｖ、Ｍｏ、Ｗ、Ｔｉ及びＮｂの含有量が合計量で４.０重量％以下であり、残部Ｆｅ及び不可避の不純物からなる。
上記成分を有するダクタイル鋳鉄材からなる芯材の組織は、パーライトを主体とする基地と、球状黒鉛及び少量の炭化物の３相からなり、チャンキー黒鉛のような異常黒鉛は観察されない。
As a material constituting the core material, a ductile cast iron material having excellent toughness is used. This ductile cast iron material is, by weight%, C: 2.8 to 4.0%, Si: 1.5 to 4.5%, Mn: 0.3 to 1.0%, Ni: 0.05 to 3.0%, Mg: 0.0 1 ~0.1 %, Sb: with containing 0.001 to 0.1%, optionally, Sn: .001 to .13% and / or Bi: containing 0.000 3 ~0.1%, Cr, V , Mo, W, the content of Ti and Nb is 4.0 wt% or less in total amount, the balance being Fe and unavoidable impurities.
The structure of the core material made of a ductile cast iron material having the above components is composed of a base mainly composed of pearlite, three phases of spherical graphite and a small amount of carbide, and no abnormal graphite such as chunky graphite is observed.
芯材を構成する前記ダクタイル鋳鉄材の成分限定理由は次の通りである。
Ｃは、黒鉛を晶出するために２.８％以上含有させる。しかし、４.０％を超えると黒鉛量が過多となり、強靱性の低下を招くので、上限を４.０％とする。
Ｓｉは、黒鉛化を促進するので１.５％以上含有させるものとし、２.０％以上の含有がより好ましい。しかし、含有量が多くなると基地が脆くなるので、上限を４.５％とする。
Ｍｎは、Ｓと結合してＭｎＳを形成し、Ｓによる脆化を防止するために０.３％以上含有させる。１.０％を超えると材質が脆くなるので、上限を１.０％とする。
Ｎｉは、黒鉛化を促進するので０.０５％以上含有させる。しかし、３.０％を越えても含有量の増加に対応する効果を得られないので、上限を３.０％とする。
Ｍｇは、黒鉛を球状化させるために０.０１％以上含有させる。しかし、０.１％を超えて含有すると黒鉛化が阻害され、強靱性の低下を招くので、上限を０.１％とする。
The reasons for limiting the components of the ductile cast iron material constituting the core material are as follows.
C is contained in an amount of 2.8% or more in order to crystallize graphite. However, if it exceeds 4.0%, the amount of graphite becomes excessive and the toughness is lowered, so the upper limit is made 4.0%.
Since Si promotes graphitization, it should be contained in an amount of 1.5% or more, more preferably 2.0% or more. However, since the base becomes brittle as the content increases, the upper limit is set to 4.5%.
Mn is combined with S to form MnS, and is contained in an amount of 0.3% or more in order to prevent embrittlement due to S. If it exceeds 1.0%, the material becomes brittle, so the upper limit is made 1.0%.
Ni accelerates graphitization, so 0.05% or more is contained. However, even if it exceeds 3.0%, the effect corresponding to the increase in the content cannot be obtained, so the upper limit is made 3.0%.
Mg is graphite is contained 0.0 1% or more in order to spheroidizing. However, if the content exceeds 0.1%, graphitization is inhibited and the toughness is lowered, so the upper limit is made 0.1%.
Ｓｂは、チャンキー黒鉛の晶出を抑制する作用を有する。チャンキー黒鉛は、前述の如く、Ｓｉ、Ｎｉ等の黒鉛化元素の含有によって晶出し易いが、Ｓｂの含有によって、このチャンキー黒鉛の晶出を阻止することができる。このチャンキー黒鉛晶出抑制作用を有効に発揮させるために、Ｓｂは、０.００１％以上含有させるものとし、０.００１５％以上含有させることが好ましい。
一方、Ｓｂは、黒鉛の球状化を阻害する作用があり、あまりに多く含有すると、芋虫状の黒鉛を発生させる傾向があり、強靱性の低下を招く。このため、Ｓｂの含有量の上限は０.１％とする。Ｓｂは、チャンキー黒鉛の晶出を抑制できれば、黒鉛球状化への悪影響を回避するためにその含有量は少ない方が好ましい。それゆえ、上限は、０.００８０％とすることが好ましい。
Sb has the effect | action which suppresses crystallization of chunky graphite. Chunky graphite is easy to crystallize by the inclusion of graphitizing elements such as Si and Ni as described above, but the crystallization of this chunky graphite can be prevented by the inclusion of Sb. In order to effectively exhibit this chunky graphite crystallization inhibiting action, Sb is contained in an amount of 0.001% or more, preferably 0.0015% or more.
On the other hand, Sb has an action of inhibiting the spheroidization of graphite, and if it is contained in an excessive amount, it tends to generate worm-like graphite, resulting in a decrease in toughness. For this reason, the upper limit of the Sb content is set to 0.1%. If Sb can suppress the crystallization of chunky graphite, it is preferable that the content of Sb is small in order to avoid adverse effects on graphite spheroidization. Therefore, the upper limit is preferably set to 0.0008%.
Ｓｎは、パーライトを安定化する作用があり、また、Ｓｂと同様、チャンキー黒鉛の晶出を抑制する作用を有するので、０.００１％以上含有することが好ましく、０.０２％以上含有することがより好ましい。一方、Ｓｂと同様、黒鉛の球状化を阻害する作用を有するため、上限は０.１３％、より好ましくは０.１０％とする。
Ｂｉは、Ｓｂと同様、チャンキー黒鉛の晶出を抑制する作用を有するので、０.０００３％以上含有させることが好ましい。Ｂｉもまた、黒鉛の球状化を阻害する元素であるので、上限は０.１％とする。
Sn has an action of stabilizing pearlite and, like Sb, has an action of suppressing crystallization of chunky graphite. Therefore, the content is preferably 0.001% or more, and 0.02% or more. It is more preferable. On the other hand, like Sb, it has the effect of inhibiting the spheroidization of graphite, so the upper limit is made 0.13%, more preferably 0.10%.
Bi, like Sb, because they have action to inhibit crystallization of chunky graphite, it is preferable to contain 0.000 to 3% or more. Since Bi is also an element that hinders the spheroidization of graphite, the upper limit is made 0.1%.
Ｃｒ、Ｖ、Ｍｏ、Ｗ、Ｔｉ及びＮｂは、炭化物を生成し、生成された炭化物によって芯材の強靱性の低下を招く。また、Ｃが炭化物生成のために消費されると、黒鉛化に必要なＣが不足することになり、結果として黒鉛化が阻害される。
それゆえ、Ｃｒ、Ｖ、Ｍｏ、Ｗ、Ｔｉ及びＮｂは、芯材に積極的に添加する元素ではないが、ハイス系鋳鉄材の外層にこれら元素を含まれる以上、外層と芯材、又は中間層と芯材を冶金学的に一体化させる際に外層から芯材へ不可避的に混入するので、芯材への混入量は合計量で４.０％以下となるように、外層及び中間層の成分を調整する。
Cr, V, Mo, W, Ti, and Nb generate carbides, and the generated carbides cause a decrease in toughness of the core material. Further, when C is consumed for the formation of carbides, C necessary for graphitization is insufficient, and as a result, graphitization is inhibited.
Therefore, Cr, V, Mo, W, Ti, and Nb are not elements that are positively added to the core material, but as long as these elements are contained in the outer layer of the high-speed cast iron material, the outer layer and the core material, or intermediate When the layers and the core material are integrated metallurgically, the outer layer and the intermediate layer are mixed so that the total amount of the core material is 4.0% or less because the outer layer inevitably mixes into the core material. Adjust the ingredients.
不純物元素であるＰ、Ｓは材質を脆くするため、できるだけ少ない方がよく、Ｐは０.１％以下、Ｓは０.０２％以下にすることが望ましい。
外層にＣｏが含まれる場合、芯材へ混入することがあるが、芯材に含まれるＣｏは特に有害ではないので、最大２％程度含まれていても差し支えない。
また、接種材として、Ｃａ、Ａｌ、Ｂａなどを添加することがあり、これら各成分が不純物として残留する場合もあるが、夫々、０.０５％以下の含有であれば差し支えない。
Impurity elements P and S are preferably made as small as possible in order to make the material brittle. P is preferably 0.1% or less and S is preferably 0.02% or less.
When Co is contained in the outer layer, it may be mixed into the core material. However, since Co contained in the core material is not particularly harmful, it may be contained up to about 2%.
In addition, Ca, Al, Ba, etc. may be added as an inoculum, and these components may remain as impurities, but they may be contained in amounts of 0.05% or less, respectively.
中間層は、外層の合金成分の芯材への混入量を少なくするために設けられ、中間層を形成する材料として、アダマイト材又は黒鉛鋼が好適に用いられる。 The intermediate layer is provided in order to reduce the amount of the alloy component of the outer layer mixed into the core material, and an adamite material or graphite steel is suitably used as a material for forming the intermediate layer.
アダマイト材は、重量％にて、Ｃ：１.５〜２.５％、Ｓｉ：０.２〜１.２％、Ｍｎ：０.２〜１.２％、Ｎｉ：０.０５〜３.０％、Ｃｒ：０.５〜４.０％、Ｖ：１.０〜４.０％を含有すると共に、Ｍｏ：０.５〜４.０％及び／又はＷ：０.０５〜３.０％を含有し、残部Ｆｅ及び不可避の不純物からなる。 The adamite material is C: 1.5-2.5%, Si: 0.2-1.2%, Mn: 0.2-1.2%, Ni: 0.05-5. 0%, Cr: 0.5-4.0%, V: 1.0-4.0%, Mo: 0.5-4.0% and / or W: 0.05-3. It contains 0% and consists of the balance Fe and inevitable impurities.
アダマイト材の成分限定理由は次の通りである。
Ｃは、含有量が１.５％より少ないと凝固点が高くなり、溶着不良が起こり易くなるので１.５％以上含有させる。一方、２.５％を超えて含まれると炭化物が過多となり材質が脆くなるので、上限は２.５％とする。
Ｓｉは、脱酸性及び湯流れ性の向上のために０.２％以上含有させる。しかし、１.２％を超えると焼入れ性が低下し、材質が脆くなるので、上限を１.２％とする。
Ｍｎは、Ｓを固定化してＳによる脆化を防ぐ役割を有するので０.２％以上含有させる。一方、含有量が多くなると靱性の低下を招くので、上限は１.２％とする。
Ｎｉは材質を強化する作用を有するので、０.０５％以上含有させる。しかし、３.０％を越えても含有量の増加に対応する効果を得られないので、上限を３.０％とする。
Ｃｒは材質を強化する作用を有するので、０.５％以上含有させる。一方、４.０％を超えると材質が脆くなるので、上限を４.０％とする。
Ｖは材質を強化する作用を有するので、１.０％以上含有させる。しかし、４.０％を超えると材質が脆くなるので、上限を４.０％とする。
The reasons for limiting the components of the adamite material are as follows.
If the content of C is less than 1.5%, the freezing point becomes high and poor welding tends to occur, so 1.5% or more is contained. On the other hand, if the content exceeds 2.5%, the carbides become excessive and the material becomes brittle, so the upper limit is made 2.5%.
Si is contained in an amount of 0.2% or more for deacidification and improvement of hot water flow. However, if it exceeds 1.2%, the hardenability decreases and the material becomes brittle, so the upper limit is made 1.2%.
Since Mn has a role of fixing S and preventing embrittlement due to S, it is contained in an amount of 0.2% or more. On the other hand, an increase in the content causes a decrease in toughness, so the upper limit is set to 1.2%.
Ni has an effect of strengthening the material, so 0.05% or more is contained. However, even if it exceeds 3.0%, the effect corresponding to the increase in the content cannot be obtained, so the upper limit is made 3.0%.
Since Cr has the effect | action which strengthens a material, 0.5% or more is contained. On the other hand, if it exceeds 4.0%, the material becomes brittle, so the upper limit is made 4.0%.
V has an effect of strengthening the material, so 1.0% or more is contained. However, if it exceeds 4.0%, the material becomes brittle, so the upper limit is made 4.0%.
Ｍｏは材質を強化する作用を有するため、０.５％以上含有させることが好ましい。一方、含有量が４.０％を超えると材質が脆くなるので、上限を４.０％とする。
Ｗは、Ｍｏと同様の作用を有し、材質を強化するため、０.０５％以上含有させることが好ましい。しかし、含有量が３.０％を超えると材質が脆くなるので、上限を３.０％とする。
なお、不純物元素であるＰ、Ｓは材質を脆くするため、できるだけ少ない方がよく、Ｐは０.１％以下、Ｓは０.０６％以下にすることが望ましい。
Since Mo has the effect | action which strengthens a material, it is preferable to make it contain 0.5% or more. On the other hand, if the content exceeds 4.0%, the material becomes brittle, so the upper limit is made 4.0%.
W has the same effect as Mo and strengthens the material, so 0.05% or more is preferably contained. However, if the content exceeds 3.0%, the material becomes brittle, so the upper limit is made 3.0%.
Note that the impurity elements P and S are preferably as small as possible in order to make the material brittle, and it is desirable that P is 0.1% or less and S is 0.06% or less.
黒鉛鋼は、重量％にて、Ｃ：１.０〜２.５％、Ｓｉ：０.５〜２.０％、Ｍｎ：０.２〜１.２％、Ｎｉ：０.１〜３.０％、Ｃｒ：０.５〜４.０％、Ｖ：１.０〜４.０％を含有すると共に、Ｍｏ：０.５〜４.０％及び／又はＷ：０.０５〜３.０％を含有し、残部Ｆｅ及び不可避の不純物からなる。 Graphite steel is, by weight%, C: 1.0-2.5%, Si: 0.5-2.0%, Mn: 0.2-1.2%, Ni: 0.1-3. 0%, Cr: 0.5-4.0%, V: 1.0-4.0%, Mo: 0.5-4.0% and / or W: 0.05-3. It contains 0% and consists of the balance Fe and inevitable impurities.
黒鉛鋼の成分限定理由は次のとおりである。
Ｃは、凝固点が高くなって溶着不良が起こり易くならないように、１.０％以上含有させる。一方、２.５％を超えて含まれると材質が脆くなるので、上限は２.５％とする。
Ｓｉは、脱酸性及び湯流れ性の向上並びに黒鉛化のために０.５％以上含有させる。しかし、２.０％を超えると材質が脆くなるので、上限を２.０％とする。
なお、ＣとＳｉ以外は、前記アダマイト材と同様である。
The reasons for limiting the components of graphite steel are as follows.
C is contained in an amount of 1.0% or more so that the freezing point becomes high and poor welding is not likely to occur. On the other hand, if the content exceeds 2.5%, the material becomes brittle, so the upper limit is made 2.5%.
Si is contained in an amount of 0.5% or more for deacidification and improvement of hot water flow and graphitization. However, if it exceeds 2.0%, the material becomes brittle, so the upper limit is made 2.0%.
In addition, except C and Si, it is the same as that of the adamite material.
中間層を形成する前記アダマイト材及び黒鉛鋼は、所望により、Ｔｉを０.３％以下、Ｎｂを１.０％以下、Ｃｏを３.０％以下の範囲内で含有させることが好ましい。
Ｔｉ及びＮｂは、材質を強化する作用を有し、Ｃｏは、基地を強化する作用を有するからである。
The adamite material and graphite steel forming the intermediate layer preferably contain Ti within a range of 0.3% or less, Nb of 1.0% or less, and Co within a range of 3.0% or less as desired.
This is because Ti and Nb have a function of strengthening the material, and Co has a function of strengthening the base.
＜実施例１＞
次に、外層と芯材が冶金学的に一体化された圧延用複合ロールの実施例を掲げる。
内径５９０ｍｍの遠心力鋳造用金型に外層材溶湯を遠心力鋳造した。鋳込量は、肉厚で外層６６ｍｍである。金型の回転を止め、外層が鋳造された金型を垂直に立てて、両端に上型と下型を連設して、その内部に芯材溶湯を鋳込み、外層と芯材が冶金学的に一体化された供試ロールを作製した。供試ロールNo.１〜No.７の外層及び芯材の合金化学成分を表１に示す。No.１〜No.５が発明例、No.６及びNo.７が比較例である。
<Example 1>
Next, examples of the composite roll for rolling in which the outer layer and the core material are metallurgically integrated will be described.
A melt of the outer layer material was centrifugally cast on a centrifugal casting mold having an inner diameter of 590 mm. The casting amount is 66 mm for the outer layer. Stop the mold rotation, stand the mold with the outer layer cast vertically, connect the upper mold and the lower mold at both ends, cast the molten core material inside, and the outer layer and core material are metallurgical A test roll integrated with the above was prepared. Table 1 shows the alloy chemical components of the outer layers and core materials of the test rolls No. 1 to No. 7. No. 1 to No. 5 are invention examples, and No. 6 and No. 7 are comparative examples.
＜実施例２＞
次に、外層、中間層及び芯材が夫々冶金学的に一体化された圧延用複合ロールの実施例を掲げる。
内径８５０ｍｍの遠心力鋳造用金型に外層材溶湯を遠心力鋳造し、外層が完全に凝固した後引き続いて中間層材溶湯を遠心力鋳造し、外層と中間層とを溶着させた。鋳込量は、肉厚で外層９０ｍｍ、中間層２５ｍｍとした。中間層が凝固するのを待って、金型の回転を止め、外層と中間層を内有した金型を垂直に立てて、両端に上型と下型を連設して、その内部に芯材となる内層材溶湯を鋳込み、外層、中間層及び芯材が冶金学的に一体化された供試ロールを作製した。供試ロールNo.１１〜No.１７の外層、中間層及び芯材の合金化学成分を表２に示す。No.１１〜No.１５が発明例、No.１６及びNo.１７が比較例である。
<Example 2>
Next, examples of the composite roll for rolling in which the outer layer, the intermediate layer, and the core material are metallurgically integrated will be described.
The outer layer material melt was centrifugally cast on a centrifugal casting mold having an inner diameter of 850 mm, and after the outer layer was completely solidified, the intermediate layer material melt was centrifugally cast to weld the outer layer and the intermediate layer. The casting amount was 90 mm for the outer layer and 25 mm for the intermediate layer. Waiting for the middle layer to solidify, stop the mold rotation, stand the mold with the outer layer and the middle layer upright, connect the upper and lower molds at both ends, and core inside A molten inner layer material as a material was cast to prepare a test roll in which the outer layer, the intermediate layer, and the core material were integrated metallurgically. Table 2 shows the alloy chemical components of the outer layers, intermediate layers, and cores of the test rolls No. 11 to No. 17. No. 11 to No. 15 are invention examples, and No. 16 and No. 17 are comparative examples.
各圧延ロールの芯材の余長部より金属組織観察用試験片を採取し、金属顕微鏡(倍率５０倍)にて、黒鉛の晶出量及び球状化の状況並びにチャンキー黒鉛の晶出の有無を観察した。また、前記芯材の余長部より引張試験片を採取し、ＪＩＳに準拠して引張試験を行なった。
実施例１及び実施例２について、黒鉛の観察結果及び引張試験結果を表１及び表２に合わせて示す。
Samples for metallographic observation were collected from the extra length of the core material of each rolling roll, and the amount of crystallization and spheroidization of graphite and presence or absence of crystallization of chunky graphite were observed with a metal microscope (50 times magnification). Was observed. Further, a tensile test piece was collected from the extra length part of the core material, and a tensile test was performed in accordance with JIS.
About Example 1 and Example 2, the observation result of graphite and the tensile test result are shown according to Table 1 and Table 2 together.
表１及び表２の結果より、発明例のNo.１〜No.５及びNo.１１〜No.１５は、チャンキー黒鉛の晶出が観察されず、また、黒鉛の球状化が良好であり、高い引張強度を具えていることを示している。
これに対し、比較例のNo.６及びNo.１６は、Ｓｂの含有量が本発明の規定よりも少ないため、チャンキー黒鉛の晶出が観察され、引張強度の低下を招いている。また、比較例のNo.７及びNo.１７は、Ｓｂの含有量が本発明の規定よりも多いため、芋虫状黒鉛の晶出が観察され、黒鉛の球状化不良により、引張強さが低くなっている。
From the results of Tables 1 and 2, No. 1 to No. 5 and No. 11 to No. 15 of the invention examples show no crystallization of chunky graphite and good spheroidization of graphite. It shows that it has high tensile strength.
On the other hand, in No. 6 and No. 16 of the comparative examples, since the Sb content is less than that of the present invention, crystallization of chunky graphite is observed, which causes a decrease in tensile strength. In Comparative Examples No. 7 and No. 17, since the Sb content is larger than that of the present invention, worm-like graphite is crystallized, and the tensile strength is low due to poor spheroidization of graphite. It has become.
図２は、発明例No.１１の金属顕微鏡写真であり、良好な球状黒鉛を有している。図３は、比較例No.１６の金属顕微鏡写真であり、チャンキー黒鉛の晶出が観察される。 FIG. 2 is a metallographic micrograph of Invention Example No. 11, which has good spherical graphite. FIG. 3 is a metallographic micrograph of Comparative Example No. 16, in which crystallization of chunky graphite is observed.
上記実施例では、外層をハイス系鋳鉄材から形成した圧延用複合ロールについて説明したが、本発明の複合ロールの外層材は、上記のハイス系鋳鉄材に限定されるものではなく、耐摩耗性にすぐれるその他材料を用いることができる。その種材料として、例えば、高クロム材、高合金グレン材、アダマイト材を挙げることができる。
高クロム材として、重量％にて、Ｃ：２.０〜３.２％、Ｓｉ：０.５〜１.５％、Ｍｎ：０.５〜１.５％、Ｎｉ：１.０〜２.０％、Ｃｒ：１０.０〜２５.０％、Ｍｏ：０.５〜１.５％、Ｖ：２.０％以下、Ｎｂ：１.０％以下を含有し、残部Ｆｅ及び不可避の不純物からなるものを示すことができる。
高合金グレン材として、重量％にて、Ｃ：２.７〜３.９％、Ｓｉ：０.４〜１.５％、Ｍｎ：０.３〜１.０％、Ｎｉ：３.５〜５.０％、Ｃｒ：１.０〜２.５％、Ｍｏ：０.１〜２.０％、Ｗ：１.０％以下、Ｖ：２.０％以下、Ｃｏ：１.０％以下、Ｎｂ：１.０％以下を含有し、残部Ｆｅ及び不可避の不純物からなるものを示すことができる。
アダマイト材として、重量％にて、Ｃ：１.０〜２.８％、Ｓｉ：０.２〜２.０％、Ｍｎ：０.２〜１.２％、Ｎｉ：０.５〜５.０％、Ｃｒ：０.５〜２.５％、Ｍｏ：０.１〜２.０％を含有し、残部Ｆｅ及び不可避の不純物からなるものを示すことができる。
In the above-described embodiment, the rolling composite roll having the outer layer formed from the high-speed cast iron material has been described. However, the outer layer material of the composite roll of the present invention is not limited to the above-described high-speed cast iron material, and is wear resistant. Other materials that are superior can be used. Examples of the seed material include a high chromium material, a high alloy grain material, and an adamite material.
As a high chromium material, in weight%, C: 2.0-3.2%, Si: 0.5-1.5%, Mn: 0.5-1.5%, Ni: 1.0-2 0.0%, Cr: 10.0 to 25.0%, Mo: 0.5 to 1.5%, V: 2.0% or less, Nb: 1.0% or less, balance Fe and inevitable What consists of impurities can be shown.
As a high alloy grain material, C: 2.7-3.9%, Si: 0.4-1.5%, Mn: 0.3-1.0%, Ni: 3.5% by weight 5.0%, Cr: 1.0-2.5%, Mo: 0.1-2.0%, W: 1.0% or less, V: 2.0% or less, Co: 1.0% or less , Nb: 1.0% or less, and what consists of the balance Fe and inevitable impurities can be shown.
As an adamite material, C: 1.0-2.8%, Si: 0.2-2.0%, Mn: 0.2-1.2%, Ni: 0.5-5. It contains 0%, Cr: 0.5-2.5%, Mo: 0.1-2.0%, and can be composed of the balance Fe and inevitable impurities.
本発明の圧延用複合ロールは、外層が耐摩耗性にすぐれ、芯材は強靱性にすぐれるので、熱間圧延用及び冷間圧延用として利用され、ロール性能の向上により、圧延製品の品質改善に対する寄与も大きい。 The rolling composite roll of the present invention has excellent wear resistance in the outer layer and excellent toughness in the core material. Therefore, it is used for hot rolling and cold rolling. Greatly contributes to improvement.
Claims (11)
外層は、重量％にて、Ｃ：１.０〜２.５％、Ｓｉ：０.２〜１.２％、Ｍｎ：０.２〜１.２％、Ｎｉ：０.０５〜３.０％、Ｃｒ：２.０〜８.０％、Ｖ：２.０〜８.０％を含有すると共に、Ｍｏ：１.４３〜８.０％及び／又はＷ：０.０５〜５.０％を含有し、残部Ｆｅ及び不可避の不純物からなり、
芯材は、重量％にて、Ｃ：２.８〜４.０％、Ｓｉ：１.５〜４.５％、Ｍｎ：０.３〜１.０％、Ｎｉ：０.０５〜３.０％、Ｍｇ：０.０１〜０.１％、Ｓｂ：０.００１〜０.１％を含有し、Ｃｒ、Ｖ、Ｍｏ及び／又はＷは、外層から不可避的に混入される成分であって、合計量で４.０重量％以下であり、残部Ｆｅ及び不可避の不純物からなることを特徴とする圧延用複合ロール。 It is a composite roll for rolling in which a ductile iron core material with excellent toughness is cast inside the outer layer made of high-speed cast iron material with excellent wear resistance, and the outer layer and core material are metallurgically integrated. There,
The outer layer is C: 1.0-2.5%, Si: 0.2-1.2%, Mn: 0.2-1.2%, Ni: 0.05-3.0 by weight%. %, Cr: 2.0 to 8.0%, V: 2.0 to 8.0%, Mo: 1.43 to 8.0% and / or W: 0.05 to 5.0 %, Consisting of the balance Fe and inevitable impurities,
The core material is C: 2.8-4.0%, Si: 1.5-4.5%, Mn: 0.3-1.0%, Ni: 0.05-5. 0%, Mg: 0.01 to 0.1%, Sb: 0.001 to 0.1%, Cr, V, Mo and / or W are components inevitably mixed from the outer layer. And a total amount of 4.0% by weight or less, comprising a balance Fe and inevitable impurities, and a rolling composite roll.
芯材の成分中、Ｃｒ、Ｖ、Ｍｏ及び／又はＷは、中間層から不可避的に混入される成分であって、合計量で４.０重量％以下であり、残部Ｆｅ及び不可避の不純物からなる請求項５に記載の圧延用複合ロール。 The intermediate layer is C: 1.5-2.5%, Si: 0.2-1.2%, Mn: 0.2-1.2%, Ni: 0.05-5. 0%, Cr: 0.5-4.0%, V: 1.0-4.0%, Mo: 0.5-4.0% and / or W: 0.05-3. containing 0%, Ri Do balance of Fe and inevitable impurities,
Among the components of the core material, Cr, V, Mo and / or W are components inevitably mixed from the intermediate layer, and the total amount is 4.0% by weight or less, and the balance is Fe and unavoidable impurities. The composite roll for rolling according to claim 5.
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