JP2003342676A - Cemented-carbide-made composite roll - Google Patents
Cemented-carbide-made composite rollInfo
- Publication number
- JP2003342676A JP2003342676A JP2002148577A JP2002148577A JP2003342676A JP 2003342676 A JP2003342676 A JP 2003342676A JP 2002148577 A JP2002148577 A JP 2002148577A JP 2002148577 A JP2002148577 A JP 2002148577A JP 2003342676 A JP2003342676 A JP 2003342676A
- Authority
- JP
- Japan
- Prior art keywords
- inner layer
- cemented carbide
- outer layer
- composite roll
- roll
- 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.)
- Granted
Links
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、薄帯材、板材、線
材、棒材などの鋼材をはじめとする金属材の圧延に用い
られる圧延用ロールに関し、特に靭性に優れる材料から
なる内層と、この内層の外周に超硬合金からなる外層を
備えた超硬合金製圧延用複合ロールに関するものであ
る。TECHNICAL FIELD The present invention relates to a rolling roll used for rolling a metal material such as a steel material such as a thin strip material, a plate material, a wire material and a bar material, and an inner layer made of a material having particularly excellent toughness, The present invention relates to a cemented carbide rolling composite roll provided with an outer layer made of cemented carbide on the outer circumference of the inner layer.
【0002】[0002]
【従来の技術】寸法精度の向上など圧延材に対する高品
質化、あるいはロール替え工数減少による生産性向上の
要求に応えるため、耐摩耗性、耐肌荒れ性などに優れた
炭化タングステン(WC)系超硬合金が線材、棒鋼、平
鋼、帯鋼などの圧延用ロールに適用されている。WC系
超硬合金は公知のごとく、WCをCo、Ni、Crなど
の金属元素で結合した焼結合金である。2. Description of the Related Art In order to meet the demand for higher quality of rolled materials such as improved dimensional accuracy, and improved productivity by reducing the number of man-hours required to change rolls, tungsten carbide (WC) -based alloys excellent in wear resistance and surface roughness are used. Hard alloys are applied to rolling rolls such as wire rods, steel bars, flat steels, and strip steels. As is well known, the WC-based cemented carbide is a sintered alloy in which WC is bonded with a metal element such as Co, Ni or Cr.
【0003】超硬合金は他のロール材と比較して高価で
あり、また耐摩耗性には優れるが、その高硬度のため靭
性に乏しい。そのため、超硬合金を圧延用ロールとして
使用する場合、超硬合金製の中空状のスリーブを、靭性
に優れた金属製軸材に嵌合する構造が一般的に採用され
ている。このような構造の場合、超硬合金製スリーブ内
面の粗度が粗い場合、嵌合時、局部的に過大な引張応力
が発生し、超硬合金製スリーブの破壊強度を超えてスリ
ーブが割れやすいという問題がある。Cemented carbide is more expensive than other roll materials and has excellent wear resistance, but it has poor toughness due to its high hardness. Therefore, when cemented carbide is used as a rolling roll, a structure in which a hollow sleeve made of cemented carbide is fitted to a metal shaft material having excellent toughness is generally adopted. In the case of such a structure, if the inner surface of the cemented carbide sleeve has a rough surface, excessive tensile stress is locally generated during fitting, and the sleeve is easily cracked beyond the fracture strength of the cemented carbide sleeve. There is a problem.
【0004】そこで近年、超硬合金からなる外層と靭性
に優れた鉄系合金からなる内層を金属接合した複合ロー
ルが、例えば特開平10−5823号公報、特開平10
−5824号公報などに開示されている。Therefore, in recent years, a composite roll in which an outer layer made of a cemented carbide and an inner layer made of an iron-based alloy having excellent toughness are metal-bonded has been disclosed in, for example, Japanese Patent Laid-Open Nos. 10-5823 and 10-23.
No. 5824 is disclosed.
【0005】前記従来の複合ロールは優れた性能を有す
るが、超硬合金と鉄系合金では、熱膨張係数がそれぞれ
約6×10−6/℃、12×10−6/℃と約2倍異な
るため、金属接合した後の冷却の際に、外層と内層との
接合境界部に大きな引張応力が発生する。この状態で圧
延を行うと、圧延による応力が接合境界部に作用し、こ
の合成応力が境界の接合強度を超えるとロールが破壊す
るおそれがある。Although the conventional composite roll has excellent performance, the coefficient of thermal expansion of the cemented carbide and the iron-based alloy is about 6 × 10 −6 / ° C. and 12 × 10 −6 / ° C., respectively, which is about twice as high. Since they are different from each other, a large tensile stress is generated in the joint boundary portion between the outer layer and the inner layer during cooling after the metal joining. If rolling is performed in this state, the stress due to rolling acts on the joint boundary portion, and if this combined stress exceeds the joint strength at the boundary, the roll may be destroyed.
【0006】この引張応力を緩和するため、例えば特開
平10−5824号公報には内層となる鉄系合金を20
0〜600℃でベイナイト変態、もしくは200〜85
0℃にてパーライト及びベイナイト変態を起こす材料が
好ましいと開示されている。In order to relieve this tensile stress, for example, Japanese Patent Laid-Open No. 10-5824 discloses an iron-based alloy of 20 as an inner layer.
Bainite transformation at 0-600 ° C, or 200-85
It is disclosed that materials that undergo pearlite and bainite transformation at 0 ° C. are preferred.
【0007】[0007]
【発明が解決しようとする課題】しかしながら、残留応
力は外層である超硬合金と内層の鉄系合金の体積比や内
層の形状、すなわち中心に孔を設けた中空形状である
か、もしくは中心に孔がない中実であるかなどの構造の
違いによって変化し、前記のような内層の変態による引
張応力の緩和はいまだ不十分であるという課題がある。However, the residual stress is the volume ratio between the cemented carbide as the outer layer and the iron-based alloy as the inner layer, the shape of the inner layer, that is, the hollow shape with a hole in the center, or There is a problem in that the relaxation of the tensile stress due to the transformation of the inner layer as described above is still insufficient, depending on the difference in the structure such as whether or not the hole is solid.
【0008】そこで、本発明は、超硬合金からなる外層
と鉄系合金からなる内層を金属接合させた複合ロールに
おいて、接合境界部の引張残留応力を緩和させるととも
に、圧延中のロール破壊を防止した安全性の高いロール
を提供することを目的とする。Therefore, the present invention relaxes the tensile residual stress at the joining boundary and prevents roll breakage during rolling in a composite roll in which an outer layer made of a cemented carbide and an inner layer made of an iron-based alloy are metal-joined. The purpose is to provide a highly safe roll.
【0009】[0009]
【課題を解決するための手段】すなわち、本発明の超硬
合金製複合ロールは、WC系超硬合金からなる外層と、
鉄系合金からなる内層が金属接合された超硬合金製複合
ロールにおいて、外層と接合された内層の外周部が実質
的にマルテンサイトを主体とする金属組織からなること
を特徴とする。That is, a cemented carbide composite roll of the present invention comprises an outer layer made of a WC-based cemented carbide,
In a cemented carbide composite roll in which an inner layer made of an iron-based alloy is metal-bonded, the outer peripheral portion of the inner layer bonded to the outer layer is substantially composed of a metal structure mainly composed of martensite.
【0010】前記本発明において、内層は化学成分が重
量比にてC:0.1〜2.0%、Ni:4.0%以下、C
r:4.0%以下、Mo:3.0%以下を含む鉄系合金
であることを特徴とする。また、内層は、B=270×
C(wt%)+90×Mn(wt%)+37×Ni(wt%)+70×
Cr(wt%)+83×Mo(wt%)に示すB値が300wt%
以上を満足することを特徴とする。さらに、ロール外層
の回転軸方向中央部における円周方向の圧縮残留応力
が、常温において100〜500MPaであることを特
徴とする。In the present invention, the chemical composition of the inner layer is C: 0.1 to 2.0% by weight, Ni: 4.0% or less, C:
It is an iron-based alloy containing r: 4.0% or less and Mo: 3.0% or less. Also, the inner layer is B = 270 ×
C (wt%) + 90 × Mn (wt%) + 37 × Ni (wt%) + 70 ×
B value shown in Cr (wt%) + 83 × Mo (wt%) is 300wt%
It is characterized by satisfying the above. Furthermore, the compressive residual stress in the circumferential direction of the central portion of the outer layer of the roll in the rotational axis direction is 100 to 500 MPa at room temperature.
【0011】[0011]
【作用】WC系超硬合金からなる外層と、鉄系合金から
なる内層が金属接合された複合ロールにおいて、外層と
接合された内層の外周部に実質的にマルテンサイトを主
体とする変態を発生させることにより、外層と内層との
接合境界部の引張残留応力を緩和できるとともに、なお
かつ十分な接合強度が得られ、圧延中に割れなどを防止
できる。In a composite roll in which an outer layer made of a WC-based cemented carbide and an inner layer made of an iron-based alloy are metal-bonded, a transformation mainly composed of martensite is generated on the outer peripheral portion of the inner layer bonded to the outer layer. By so doing, it is possible to relax the tensile residual stress at the joint boundary portion between the outer layer and the inner layer, obtain sufficient joint strength, and prevent cracking during rolling.
【0012】内層の外周部にマルテンサイトを生成させ
るためには、内層は以下に示す合金を重量比で含有する
必要がある。内層のC量は鉄系材料において重要な要因
である。Cはその含有量によって鉄系材料の基地組織を
決定するため最も基本的な成分である。Cが0.1%未
満の場合、内層はパーライト変態が主体となり、外層と
内層の境界接合部にて過大な引張残留応力が発生し、外
層と内層の境界接合部の剥離が生じやすい。また、2.
0%を超えると、オーステナイトが大量に残留するため
変態制御が難しく、残留応力の制御が困難となる。In order to generate martensite on the outer peripheral portion of the inner layer, the inner layer must contain the alloys shown below in a weight ratio. The amount of C in the inner layer is an important factor in iron-based materials. C is the most basic component because it determines the matrix structure of the iron-based material depending on its content. When C is less than 0.1%, the inner layer mainly undergoes pearlite transformation, excessive tensile residual stress is generated at the boundary joint between the outer layer and the inner layer, and delamination at the boundary joint between the outer layer and the inner layer is likely to occur. Also 2.
If it exceeds 0%, a large amount of austenite remains, which makes it difficult to control transformation and difficult to control residual stress.
【0013】Niは、オーステナイト安定化元素であ
り、焼入れ性を向上させる重要な元素である。しかしな
がら、4.0%を超えると、残留オーステナイト量が増
加し、基地組織が不安定となるため4.0%以下である
ことが好ましい。Ni is an austenite stabilizing element and is an important element for improving hardenability. However, if it exceeds 4.0%, the amount of retained austenite increases and the matrix structure becomes unstable, so it is preferably 4.0% or less.
【0014】Crは、Cと結合して炭化物を形成し硬さ
を向上させるため、機械的性質に影響を与える重要な元
素である。また、オーステナイトを安定化させる元素の
ため、変態制御を行なう上でも重要な元素である。Cr
が4.0%を超えると、残留オーステナイト量が増加
し、機械的性質が劣化し、また変態制御が難しくなる。Cr is an important element that affects mechanical properties because it combines with C to form a carbide to improve hardness. Further, since it is an element that stabilizes austenite, it is an important element in controlling transformation. Cr
If it exceeds 4.0%, the amount of retained austenite increases, the mechanical properties deteriorate, and it becomes difficult to control the transformation.
【0015】Moは、Cと結合して炭化物を形成するた
め、硬さつまり機械的強度を制御するために重要な元素
である。しかし、添加量が多すぎると靱性を低下させ
る。よって、Moは3.0%以下とする。Mo is an important element for controlling hardness, that is, mechanical strength, because it forms a carbide by combining with C. However, if the addition amount is too large, the toughness is reduced. Therefore, Mo is 3.0% or less.
【0016】Mnは、脱酸効果があり、焼入れ硬化性を
高める作用がある。しかし、2.0%を越えると靱性が
劣化するため2.0%以下が望ましい。[0016] Mn has a deoxidizing effect and has an effect of enhancing quench hardening. However, if it exceeds 2.0%, the toughness deteriorates, so 2.0% or less is desirable.
【0017】また、各々の成分のマルテンサイト変態へ
の寄与を鋭意研究した結果、ベイナイト開始温度に基づ
いた関係から、B=270×C(wt%)+90×Mn(wt%)
+37×Ni(wt%)+70×Cr(wt%)+83×Mo(wt
%)の式で表わされるB値が300wt%以上となった場
合に、内層の外周部にマルテンサイト変態が安定して得
られることが判った。Further, as a result of earnest research on the contribution of each component to the martensitic transformation, B = 270 × C (wt%) + 90 × Mn (wt%) from the relationship based on the bainite start temperature.
+37 x Ni (wt%) +70 x Cr (wt%) +83 x Mo (wt
It has been found that martensitic transformation can be stably obtained in the outer peripheral portion of the inner layer when the B value represented by the formula (%) is 300 wt% or more.
【0018】[0018]
【発明の実施の形態】(実施例1)次に、本発明の実施
例を図面に基づいて説明する。図1は圧延用複合ロール
を製造するのに用いるHIP法を説明する概略断面図を
示す。なお、図1において右半分部分は対称なため省略
した。図1において、内径φ150mm、長さ1000
mmのHIP缶2の中央に、表1の実施例1に示す組成
の鉄系合金からなる中実の内層1を配置した。また、重
量比でWC:50%、Co:50%からなる超硬合金粉
末をCIPにて成形を行った後、焼結して厚み2mmの
中間層素材4を作製した。そして、内層1の外周に中間
層として中間層素材4を配置した。Embodiment 1 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view for explaining the HIP method used to manufacture a composite roll for rolling. The right half of FIG. 1 is omitted because it is symmetrical. In FIG. 1, inner diameter φ150 mm, length 1000
A solid inner layer 1 made of an iron-based alloy having the composition shown in Example 1 of Table 1 was placed in the center of the HIP can 2 of mm. Further, a cemented carbide powder composed of WC: 50% and Co: 50% by weight was molded by CIP and then sintered to prepare an intermediate layer material 4 having a thickness of 2 mm. Then, the intermediate layer material 4 was arranged on the outer periphery of the inner layer 1 as an intermediate layer.
【0019】その後、中間層素材4の外面とHIP缶2
の内面との間に形成された空隙に、ロール外層として重
量比でWC:85%、Co:12%、Ni:3%からな
る超硬合金粉末3を充填した。Then, the outer surface of the intermediate layer material 4 and the HIP can 2
The void formed between the inner surface and the inner surface was filled with the cemented carbide powder 3 composed of WC: 85%, Co: 12%, and Ni: 3% by weight as a roll outer layer.
【0020】次いで、HIP缶2を溶接密封し、真空ポ
ンプで脱気処理した後、HIP装置にて、HIP処理を
行なった。ここで、5は加熱ヒータ、6はHIP炉を表
わす。冷却後、HIP缶2を機械加工により除去した。
このようにして本発明の超硬合金の外層を有する複合ロ
ールを得た。本発明の複合ロールは、カラーチェックに
より、ロール端面に割れがないこと、また超音波探傷検
査により、外層、中間層および内層が健全に接合してい
ることを確認した。また、外層と接合された内層の外周
部、つまり外層と内層との接合境界部近傍の内層のサン
プルを採取し、この硬さを測定した。さらに、このサン
プルの組織を確認したところ、マルテンサイトを主体と
する金属組織からなっていた。Next, the HIP can 2 was welded and hermetically sealed, deaerated by a vacuum pump, and then HIP processed by a HIP device. Here, 5 is a heater and 6 is a HIP furnace. After cooling, the HIP can 2 was removed by machining.
Thus, a composite roll having an outer layer of the cemented carbide of the present invention was obtained. In the composite roll of the present invention, it was confirmed by color check that there was no crack on the end face of the roll, and by ultrasonic flaw detection that the outer layer, the intermediate layer and the inner layer were joined properly. Further, a sample of the outer peripheral portion of the inner layer joined to the outer layer, that is, the inner layer in the vicinity of the joint boundary portion between the outer layer and the inner layer was sampled, and the hardness was measured. Furthermore, when the structure of this sample was confirmed, it was composed of a metal structure mainly composed of martensite.
【0021】さらに、ロール外層の回転軸方向中央部に
おける円周方向の圧縮残留応力を、歪ゲージを用いた破
壊方法によって測定した。表2に、内層の外周部の硬さ
および外層の回転軸方向中央部における円周方向の圧縮
残留応力値を示す。Further, the compressive residual stress in the circumferential direction at the central portion of the outer layer of the roll in the rotational axis direction was measured by the fracture method using a strain gauge. Table 2 shows the hardness of the outer peripheral portion of the inner layer and the compressive residual stress value in the circumferential direction of the outer layer in the central portion in the rotational axis direction.
【0022】(実施例2)図2に圧延用複合ロールを製
造するのに用いるHIP法を説明する概略断面図を示
す。なお、図2において右半分部分は対称なため省略し
た。図2において、内径φ300mm、長さ1500m
mのHIP缶2の中央に、表1の実施例2に示す組成の
鉄系合金からなる中空円筒状の内層1を配置し、内層1
の外面とHIP缶2の内面との間に形成された空隙に、
ロール外層として予めプレス成形した重量比でWC:8
0%、Co:20%からなる超硬合金素材3を挿入し
た。(Embodiment 2) FIG. 2 shows a schematic cross-sectional view for explaining the HIP method used for manufacturing a composite roll for rolling. In FIG. 2, the right half part is omitted because it is symmetrical. In Fig. 2, inner diameter φ300mm, length 1500m
A hollow cylindrical inner layer 1 made of an iron-based alloy having the composition shown in Example 2 of Table 1 is disposed in the center of the HIP can 2 of m.
In the space formed between the outer surface of the HIP can 2 and the inner surface of the HIP can 2,
WC: 8 by weight ratio pre-pressed as outer layer of roll
A cemented carbide material 3 consisting of 0% and Co: 20% was inserted.
【0023】この超硬合金素材3の内面と内層1の外面
との間に約5mmの隙間を形成して、その隙間に重量比
でWC:30%、Co:70%の超硬合金からなる中間
層用の粉末4を充填した。A clearance of about 5 mm is formed between the inner surface of the cemented carbide material 3 and the outer surface of the inner layer 1, and the clearance is made of a cemented carbide of WC: 30% and Co: 70% by weight. Powder 4 for the intermediate layer was filled.
【0024】次いで、HIP缶2を溶接密封し、真空ポ
ンプで脱気処理した後、HIP装置にて、HIP処理を
施した。冷却後、HIP缶2を機械加工により除去し
た。このようにして本発明の超硬合金の外層を有する複
合ロールを得た。実施例1同様の検査をしたところ、外
層と内層とが中間層を挟んで健全に接合しており、外層
と接合された内層の外周部はマルテンサイトを主体とす
る金属組織からなることが確認できた。表2に、内層の
外周部の硬さおよび外層の圧縮残留応力値を示す。Next, the HIP can 2 was welded and hermetically sealed, deaerated by a vacuum pump, and then HIP processed by a HIP device. After cooling, the HIP can 2 was removed by machining. Thus, a composite roll having an outer layer of the cemented carbide of the present invention was obtained. When the same inspection as in Example 1 was performed, it was confirmed that the outer layer and the inner layer were joined to each other with the intermediate layer interposed therebetween, and that the outer peripheral portion of the inner layer joined to the outer layer was composed of a metal structure mainly composed of martensite. did it. Table 2 shows the hardness of the outer peripheral portion of the inner layer and the compressive residual stress value of the outer layer.
【0025】(実施例3)中間層の施工を行なわなかっ
た以外は、実施例2と同様の方法で、表1の実施例3に
示す組成の鉄系合金からなる中空円筒状の内層を用い
て、内層と超硬合金の外層とが直接に接合した複合ロー
ルを製造した。実施例1同様の検査をしたところ、外層
と内層が健全に接合しており、外層と接合された内層の
外周部はマルテンサイトを主体とする金属組織からなる
ことが確認できた。表2に、内層の外周部の硬さおよび
外層の圧縮残留応力値を示す。(Example 3) A hollow cylindrical inner layer made of an iron-based alloy having the composition shown in Example 3 of Table 1 was used in the same manner as in Example 2 except that the intermediate layer was not applied. Thus, a composite roll in which the inner layer and the outer layer of the cemented carbide were directly bonded was manufactured. When the same inspection as in Example 1 was carried out, it was confirmed that the outer layer and the inner layer were joined together soundly, and that the outer peripheral portion of the inner layer joined with the outer layer was composed of a metallic structure mainly composed of martensite. Table 2 shows the hardness of the outer peripheral portion of the inner layer and the compressive residual stress value of the outer layer.
【0026】(比較例1)実施例1と同様の方法で、表
1の比較例1に示す組成の鉄系合金からなる中空円筒状
の内層を用いて複合ロールを製造した。ロール製造後、
実施例1同様の検査をしたところ、外層、中間層と内層
の接合部に全周にわたって割れが発生していた。また、
超音波探傷で検査したところ、ロール全面に割れが進展
していた。また、外層と接合された内層の外周部のサン
プルを採取し組織を確認したところ、ベイナイトを主体
とする金属組織からなっていた。表2に、内層の外周部
の硬さおよび外層の圧縮残留応力値を示す。Comparative Example 1 In the same manner as in Example 1, a composite roll was manufactured using a hollow cylindrical inner layer made of an iron-based alloy having the composition shown in Comparative Example 1 in Table 1. After roll production
When the same inspection as in Example 1 was conducted, cracks were found at the joints of the outer layer, the intermediate layer and the inner layer over the entire circumference. Also,
When inspected by ultrasonic flaw detection, cracks developed on the entire surface of the roll. Further, when a sample of the outer peripheral portion of the inner layer joined to the outer layer was sampled and the structure was confirmed, it was found to be composed of a metal structure mainly composed of bainite. Table 2 shows the hardness of the outer peripheral portion of the inner layer and the compressive residual stress value of the outer layer.
【0027】(比較例2)実施例2と同様の方法で、表
1の比較例2に示す組成の鉄系合金からなる中空円筒状
の内層を用いて複合スリーブロールを製造した。ロール
製造後、実施例1同様の検査をしたところ、外層と内層
とが中間層を挟んで健全に接合しており、またロール全
面にわたっても割れは確認されなかった。また、外層と
接合された内層の外周部のサンプルを採取し組織を確認
したところ、ベイナイトを主体とする金属組織からなっ
ていた。しかしながら、外層の回転軸方向中央部におけ
る円周方向の圧縮残留応力が559MPaと高いもので
あった。Comparative Example 2 In the same manner as in Example 2, a composite sleeve roll was manufactured using a hollow cylindrical inner layer made of an iron-based alloy having the composition shown in Comparative Example 2 in Table 1. After the roll was manufactured, the same inspection as in Example 1 was carried out. As a result, the outer layer and the inner layer were bonded to each other with the intermediate layer interposed therebetween, and no crack was observed on the entire surface of the roll. Further, when a sample of the outer peripheral portion of the inner layer joined to the outer layer was sampled and the structure was confirmed, it was found to be composed of a metal structure mainly composed of bainite. However, the compressive residual stress in the circumferential direction at the central portion of the outer layer in the rotational axis direction was as high as 559 MPa.
【0028】このスリーブロールを焼嵌めによって軸に
固定し、実際の圧延に用いたところ、圧延後、外層と内
層の接合部に割れが発生した。これは、圧延中に作用す
る圧延荷重などの応力が作用した結果、外層と内層の接
合部に作用する引張残留応力と相俟って境界の接合強度
以上の応力が作用したことが原因と考えられる。When this sleeve roll was fixed to the shaft by shrinkage fitting and used for actual rolling, cracks occurred at the joint between the outer layer and the inner layer after rolling. It is thought that this is because the stress, such as the rolling load acting during rolling, acted as a result of the tensile residual stress acting on the joint between the outer layer and the inner layer, and the stress above the joint strength at the boundary. To be
【0029】(比較例3)実施例3と同様の方法で、表
1の比較例3に示す組成の鉄系合金からなる中空円筒状
の内層を用いて複合ロールを製造した。ロール製造後、
実施例1同様の検査をしたところ、外層と内層の接合部
に全周にわたって割れが発生していた。またロール全面
に割れが進展していた。また、外層と接合された内層の
外周部のサンプルを採取し組織を確認したところ、ベイ
ナイトを主体とする金属組織からなっていた。Comparative Example 3 In the same manner as in Example 3, a composite roll was manufactured using a hollow cylindrical inner layer made of an iron-based alloy having the composition shown in Comparative Example 3 in Table 1. After roll production
When the same inspection as in Example 1 was conducted, cracks were found at the joint between the outer layer and the inner layer over the entire circumference. In addition, cracks had spread all over the roll. Further, when a sample of the outer peripheral portion of the inner layer joined to the outer layer was sampled and the structure was confirmed, it was found to be composed of a metal structure mainly composed of bainite.
【0030】 表1 内層の成分含有量(重量%) C Mn Cr Ni Mo B値 実施例1 0.49 0.53 1.62 3.05 0.53 532 実施例2 1.12 0.37 0.54 1.00 0.51 452 実施例3 0.27 0.68 1.18 2.24 0.29 324 比較例1 0.19 0.76 0.66 1.58 0.20 241 比較例2 0.30 0.43 0.99 2.14 0.15 281 比較例3 0.37 0.49 1.02 − 0.19 231 −:検出されず[0030] Table 1 Inner layer content (% by weight) C Mn Cr Ni Mo B value Example 1 0.49 0.53 1.62 3.05 0.53 532 Example 2 1.12 0.37 0.54 1.00 0.51 452 Example 3 0.27 0.68 1.18 2.24 0.29 324 Comparative Example 1 0.19 0.76 0.66 1.58 0.20 241 Comparative Example 2 0.30 0.43 0.99 2.14 0.15 281 Comparative Example 3 0.37 0.49 1.02-0.19 231 -: Not detected
【0031】 [0031]
【0032】以上の結果から、本発明は、超硬合金から
なる外層と接合された鉄系合金からなる内層の外周部に
実質的にマルテンサイトを主体とする変態を発生させる
ことにより、外層と内層との接合境界部の引張残留応力
を緩和できる。また、前述の内層のB値を300wt%
以上とすることにより、外層と内層との接合境界部の引
張残留応力を確実に緩和できることがわかった。From the above results, according to the present invention, the outer layer of the cemented carbide and the outer layer of the iron-based alloy are joined to each other to generate a transformation mainly containing martensite in the outer peripheral portion of the inner layer of the ferrous alloy. It is possible to relax tensile residual stress at the joint boundary with the inner layer. In addition, the B value of the inner layer is 300 wt%
By the above, it was found that the tensile residual stress at the joint boundary portion between the outer layer and the inner layer can be reliably relaxed.
【0033】[0033]
【発明の効果】本発明の超硬合金からなる外層と鉄系合
金からなる内層を金属接合させた複合ロールによれば、
接合境界部の引張残留応力を緩和させるとともに、圧延
中のロール破壊を防止した安全性の高いロールを得るこ
とができる。According to the composite roll of the present invention, the outer layer made of cemented carbide and the inner layer made of iron-based alloy are metal-bonded to each other.
It is possible to obtain a highly safe roll that relieves the tensile residual stress at the joint boundary portion and prevents roll breakage during rolling.
【図1】圧延用複合ロールを製造するのに用いるHIP
法を説明する概略断面図を示す。FIG. 1 HIP used to manufacture a composite roll for rolling
The schematic sectional drawing explaining a method is shown.
【図2】他の圧延用複合ロールを製造するのに用いるH
IP法を説明する概略断面図を示す。FIG. 2 H used to manufacture another composite roll for rolling
The schematic sectional drawing explaining IP method is shown.
1 内層、 2 HIP缶、 3 超硬合金粉末(超硬
合金素材)、4 中間層素材(中間層用粉末)、 5
加熱ヒータ、 6 HIP炉1 inner layer, 2 HIP can, 3 cemented carbide powder (cemented carbide material), 4 intermediate layer material (intermediate layer powder), 5
Heater, 6 HIP furnace
Claims (4)
金からなる内層が金属接合された超硬合金製複合ロール
において、外層と接合された内層の外周部が実質的にマ
ルテンサイトを主体とする金属組織からなることを特徴
とする超硬合金製複合ロール。1. In a cemented carbide composite roll in which an outer layer made of a WC-based cemented carbide and an inner layer made of an iron-based alloy are metal-bonded, the outer peripheral portion of the inner layer bonded to the outer layer substantially forms martensite. A cemented carbide composite roll characterized by comprising a metallic structure as a main component.
0.1〜2.0%、Ni:4.0%以下、Cr:4.0%以
下、Mo:3.0%以下を含む鉄系合金であることを特
徴とする請求項1に記載の超硬合金製複合ロール。2. The chemical composition of the inner layer is C: in a weight ratio.
The iron-based alloy containing 0.1 to 2.0%, Ni: 4.0% or less, Cr: 4.0% or less, and Mo: 3.0% or less. Cemented carbide composite roll.
0×Mn(wt%)+37×Ni(wt%)+70×Cr(wt%)+
83×Mo(wt%)に示すB値が300wt%以上を満足
することを特徴とする請求項1または2に記載の超硬合
金製複合ロール。3. The inner layer is B = 270 × C (wt%) + 9
0 x Mn (wt%) + 37 x Ni (wt%) + 70 x Cr (wt%) +
The cemented carbide composite roll according to claim 1 or 2, wherein a B value represented by 83 x Mo (wt%) satisfies 300 wt% or more.
円周方向の圧縮残留応力が、常温において100〜50
0MPaであることを特徴とする請求項1〜3のいずれ
かに記載の超硬合金製複合ロール。4. The compressive residual stress in the circumferential direction at the central portion of the outer layer of the roll in the rotation axis direction is 100 to 50 at room temperature.
It is 0 MPa, The composite roll made from a cemented carbide in any one of Claims 1-3 characterized by the above-mentioned.
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KR102553279B1 (en) * | 2018-01-31 | 2023-07-06 | 가부시키가이샤 프로테리아루 | Cemented carbide composite roll |
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