JPH0191902A - Composite cermet roll - Google Patents
Composite cermet rollInfo
- Publication number
- JPH0191902A JPH0191902A JP24739187A JP24739187A JPH0191902A JP H0191902 A JPH0191902 A JP H0191902A JP 24739187 A JP24739187 A JP 24739187A JP 24739187 A JP24739187 A JP 24739187A JP H0191902 A JPH0191902 A JP H0191902A
- Authority
- JP
- Japan
- Prior art keywords
- cermet
- roll
- core material
- thermal expansion
- composite
- 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
- 239000011195 cermet Substances 0.000 title claims abstract description 60
- 239000002131 composite material Substances 0.000 title claims abstract description 18
- 239000011162 core material Substances 0.000 claims abstract description 37
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 150000004767 nitrides Chemical class 0.000 claims abstract description 4
- 239000011230 binding agent Substances 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 5
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 6
- 238000005098 hot rolling Methods 0.000 abstract description 4
- 150000001247 metal acetylides Chemical class 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract 2
- 230000003647 oxidation Effects 0.000 description 21
- 238000007254 oxidation reaction Methods 0.000 description 21
- 239000011651 chromium Substances 0.000 description 11
- 229910003470 tongbaite Inorganic materials 0.000 description 8
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 230000004584 weight gain Effects 0.000 description 3
- 235000019786 weight gain Nutrition 0.000 description 3
- 229910000531 Co alloy Inorganic materials 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 2
- 229910009043 WC-Co Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は、冷間、温間、熱間等の圧延において、用いら
れるサーメットロールに関し、特に合金製芯材の外周に
サーメットの外皮を強固に形成させたものである。Detailed Description of the Invention "Industrial Application Field" The present invention relates to a cermet roll used in cold, warm, hot rolling, etc., and particularly relates to a cermet roll used in rolling, such as cold rolling, warm rolling, and hot rolling. It was formed by
「従来の技術」
ｔ′来、圧延用部材には鋳鋼や工具鋼などの材料が使用
されているが、これら材料は耐摩耗性が低いために、そ
の使用寿命は短い、このため最近では、耐摩耗性にすぐ
れたＷＣ−Ｃｏ系超硬合金が使用されるようになってい
る。しかしＷＣ−Ｃｏ系超硬合金の比重は約１５であっ
て、鋳鋼や工具鋼などの２倍近くある。このため作動中
にびびりゃ振動が発生する問題、さらにロールの重量が
大きくなり、従って慣性力が大きくなり、ローラの周速
が被加工物の通過速度とのズレが大きく、両者間に大き
なスリセブ量が発生してローラ上の被加工物の品質が損
なわれる。そのためさらに下記のように改良したロール
がある。``Prior art'' Since then, materials such as cast steel and tool steel have been used for rolling members, but these materials have low wear resistance and have a short service life. WC-Co cemented carbide, which has excellent wear resistance, has come into use. However, the specific gravity of WC-Co cemented carbide is about 15, which is nearly twice that of cast steel or tool steel. As a result, there is a problem that vibrations occur during operation, and the weight of the roll increases, resulting in a large inertia force.The circumferential speed of the roller has a large discrepancy with the passing speed of the workpiece, and there is a large slit between the two. The quality of the workpiece on the rollers is compromised. Therefore, there are rolls that have been further improved as shown below.
特開昭５３−５８１４７号公報は、ロールを軽量化する
ため内層（芯材）を軽量のＴｉＣ−Ｘ１系サーメツト（
比重５．１）とし、その外周に硬質で耐摩耗性のあるＷ
Ｃ−Ｃｏ系超硬合金（比重１４．Ｏ）製の外層を設けた
複合ガイドロールを示している。このロールは内層と外
層との熱膨張率を互いに近似したものを使用すると記載
しているものの、その差が２５％と大きく、熱膨張率の
差による残留応力の発生を十分に低減できず、また内層
に超硬合金より靭性の劣るサーメットを用いるため、イ
Δ頼性が欠ける。JP-A-53-58147 discloses that the inner layer (core material) is made of lightweight TiC-X1 cermet (
Specific gravity 5.1), hard and wear-resistant W on the outer periphery
It shows a composite guide roll provided with an outer layer made of C--Co cemented carbide (specific gravity: 14.0). Although it is stated that this roll uses inner and outer layers with thermal expansion coefficients that are similar to each other, the difference is as large as 25%, and the generation of residual stress due to the difference in thermal expansion coefficients cannot be sufficiently reduced. Also, since cermet, which has lower toughness than cemented carbide, is used for the inner layer, reliability is lacking.
また特開昭５１−８４７１１号公報には、焼結されたＷ
Ｃ−Ｃｏ合金製の円柱の外周に、プレス成型したＷＣ−
Ｃｏ合金製の内筒を嵌合させて焼結させたロールが示さ
れている。しかし、内層側円柱と外層側円柱との熱膨張
率の差については何も考慮していない。Furthermore, Japanese Patent Application Laid-open No. 51-84711 discloses that sintered W
Press-molded WC- on the outer periphery of a cylinder made of C-Co alloy.
A roll with a Co alloy inner cylinder fitted and sintered is shown. However, no consideration is given to the difference in coefficient of thermal expansion between the inner cylinder and the outer cylinder.
さらに特開昭５５−８２１０３号公報は、耐熱合金より
なる芯材の外表面に、芯材よりもＣｒｙの多いＮｉ基合
金、 Ｃｏ六金合金Ｆｅ基合金等の耐食性合金粉末をＨ
ＩＰ法により被覆させた複合耐熱合金部側を示している
。この複合耐熱合金部材は、高温強度が向上するととも
に耐高温腐食性が向上しているが、芯材と外装の熱膨張
率の差については何も考慮していない。Furthermore, JP-A-55-82103 discloses that a corrosion-resistant alloy powder such as a Ni-based alloy, a Co-hexametal alloy, and an Fe-based alloy, which has more Cry than the core material, is applied to the outer surface of a core material made of a heat-resistant alloy.
The side of the composite heat-resistant alloy part coated by the IP method is shown. Although this composite heat-resistant alloy member has improved high-temperature strength and high-temperature corrosion resistance, no consideration is given to the difference in coefficient of thermal expansion between the core material and the exterior.
「問題点を解決するための手段」
本発明は靭性のある芯材の外周に、軽量かつ硬質のサー
メットの外皮を形成した複合サーメットロールである。"Means for Solving the Problems" The present invention is a composite cermet roll in which a lightweight and hard cermet outer skin is formed around the outer periphery of a tough core material.
芯材としては１例えばＳＣＭ４４０合金のような溶製材
により形成して靭性を向上し、その熱膨張率は約１２．
５Ｘ １０−’ ／”０のものを使用した。The core material is made of a melted material such as SCM440 alloy to improve toughness, and its coefficient of thermal expansion is approximately 12.
5×10−′/”0 was used.
外皮サーメットは、硬質相がｑ６ 、 Ｖａ 、 Ｖｌ
ａ属元素の炭化物、窒化物の一種以上からなり、サーメ
ットの結合相は、重量％で５≦Ｃｒ≦３０、５≦Ｎｉ≦
３０、残部がＦｅおよび不可避不純物からなる。The outer skin cermet has a hard phase of q6, Va, Vl
The binder phase of the cermet is composed of one or more carbides and nitrides of Group A elements, and the binder phase of the cermet is 5≦Cr≦30, 5≦Ni≦ in weight%.
30, the remainder consisting of Fe and unavoidable impurities.
このような成分にするとともに、外皮の熱膨張率を芯材
のそれに対し、常温から１０００℃までの各温度で±２
０％以下におさえ、芯材と外皮との間の残留応力を低減
した。なお熱膨張率の差が±２０％以」二だと接合界面
にクラックが発生し、接合不良となるので±２０％以下
にする必要がある。In addition to using such ingredients, the coefficient of thermal expansion of the outer skin is ±2 that of the core material at each temperature from room temperature to 1000°C.
The residual stress between the core material and the outer skin was reduced to 0% or less. Note that if the difference in thermal expansion coefficient is more than ±20%, cracks will occur at the bonding interface, resulting in poor bonding, so it is necessary to make it less than ±20%.
外皮サーメットにおいて、硬質相の合計重量が３０％以
下だと耐摩耗性に劣り、９５％を越えて含有すると靭性
が劣るため、３０％以−ヒ９５％以下とした、また、硬
質相中に炭化クロムを含ませると、耐酸化性、耐肌荒性
、耐摩耗性が向上するが、Ｃｒ３Ｃ２）Ｃｒ７ Ｃ３、
（Ｃ：ｒ、 Ｆｅ） ７Ｃ３の一種または二種以上が２
０重量％以下だと耐酸化性に劣るため、炭化クロムを硬
質相に２０重量％以丘含ませた。In the outer cermet, if the total weight of the hard phase is less than 30%, the wear resistance will be poor, and if it exceeds 95%, the toughness will be poor. When chromium carbide is included, oxidation resistance, roughness resistance, and wear resistance are improved, but Cr3C2)Cr7C3,
(C:r, Fe) One or more of 7C3 is 2
Since oxidation resistance is poor if it is less than 0% by weight, 20% by weight or more of chromium carbide is included in the hard phase.
サーメットの結合相は、Ｃｒ、 Ｎｉが重量％で、それ
ぞれ５％未満だと耐酸化性に劣り、それぞれ３０％を越
えて含有すると靭性が劣るため、 ５≦Ｃｒ≦３０、５
≦Ｎｉ≦３０とした。さらにサーメットの成分を前記の
ものにすることにより、芯材と外皮との接合界面に、サ
ーメットを構成する接合相の重量比率よりも量の多い界
面相（オーステナイト相と考えられる）および拡散相が
存在し、接合は強固となる。The binder phase of cermet contains Cr and Ni in weight%, and if each content is less than 5%, the oxidation resistance will be poor, and if each content exceeds 30%, the toughness will be poor, so 5≦Cr≦30, 5
≦Ni≦30. Furthermore, by using the above-mentioned components of the cermet, an interfacial phase (considered to be an austenite phase) and a diffused phase are present at the bonding interface between the core material and the outer skin in an amount greater than the weight ratio of the bonding phase constituting the cermet. exists, and the bond becomes strong.
「実施例１」
ロールの芯材は、外径１４０ｍｍ、内径５０ ａｍ 、
長さ９５ｍｍの円筒形に、合金５Ｃ）４４４０を使用し
て溶解法により形成した。"Example 1" The core material of the roll has an outer diameter of 140 mm, an inner diameter of 50 am,
A cylindrical shape with a length of 95 mm was formed by a melting method using alloy 5C) 4440.
芯材の外周を被覆する６外皮は、下記第１表に示すＡ−
Ｃ３種類の組成のものを使用してそれぞれ芯材外周にサ
ーメットを形成し、それぞれの特質を比較した。なおサ
ーメットの硬質相となるＩＶａ、 Ｖａ 、 Ｖｌａ属
元素の炭化物、窒化物は、合計で３０〜９５ｗｔ％の範
囲にして、十分な耐摩耗性を有するとともに適切な靭性
を有するようにした。The 6 outer skins that cover the outer periphery of the core material are A- as shown in Table 1 below.
Cermets were formed on the outer periphery of the core materials using C3 types of compositions, and the characteristics of each were compared. The carbides and nitrides of IVa, Va, and Vla group elements, which form the hard phase of the cermet, were set in a total range of 30 to 95 wt% to ensure sufficient wear resistance and appropriate toughness.
外皮の形成は、各組成ごとにボールミルで混合し、成形
圧５００〜１０００ｋｇ／ Ｃｍ”でＣＩＰ成形し、こ
の成形体を前記芯材外周に嵌合して、１０００〜１３０
０℃で仮焼結することにより収縮させて両者を一体化さ
せた。この焼結後、さらに芯材と外皮との界面に界面相
を生じさせて強く結合させるため、前記仮焼結温度から
２５℃以下の温度間、１０００ ａｔｍに２時間保持す
るＨＩＰ処理をして外径２５０ｍｍ、内径 １４０■璽
長さ９５ｍｍの３種類の複合サーメットロールを作成し
た。各複合サーメットロールについて、芯材と外皮サー
メットの熱膨張率差を測定し、その結果を第２表に示し
た。なお熱膨張率差は、常温から１０００℃までの各温
度での最大となる値を示した。To form the outer skin, each composition is mixed in a ball mill, CIP molded at a molding pressure of 500 to 1000 kg/cm, and this molded body is fitted to the outer periphery of the core material to form a 1000 to 130 kg/cm.
By pre-sintering at 0° C., the two were shrunk and integrated. After this sintering, in order to further generate an interfacial phase at the interface between the core material and the outer skin to form a strong bond, HIP treatment is performed at a temperature below 25°C from the preliminary sintering temperature and held at 1000 atm for 2 hours. Three types of composite cermet rolls with an outer diameter of 250 mm, an inner diameter of 140 cm, and a length of 95 mm were prepared. For each composite cermet roll, the difference in thermal expansion coefficient between the core material and the outer cermet was measured, and the results are shown in Table 2. Note that the difference in thermal expansion coefficient showed the maximum value at each temperature from room temperature to 1000°C.
またサーメッ）Ａ−Ｃを使用した各複合サーメットロー
ルの芯材と外皮との接合面部分の断面写真を、それぞれ
第１〜３図に示した。In addition, cross-sectional photographs of the joint surface portion between the core material and the outer skin of each composite cermet roll using Cermet A-C are shown in Figs. 1 to 3, respectively.
第１図の写真から、サーメッ）Ａを使用したものは、接
合界面のサーメット側に大きな割れが発生していること
がわかる。これは、芯材と外皮サーメットの熱膨張率差
が２５％と大きなためと考えられる。From the photograph in FIG. 1, it can be seen that in the case where Cermet A was used, large cracks occurred on the cermet side of the bonding interface. This is thought to be because the difference in thermal expansion coefficient between the core material and the outer cermet is as large as 25%.
第２図の写真から、サーメッ）Ｂを使用したものは、芯
材と外皮サーメットとの接合界面が良好な場合となって
いる。これは、芯材と外皮、との熱膨張率差が１８％で
あって、２０％以下になっているためと考えられる。From the photograph in FIG. 2, it can be seen that the bonding interface between the core material and the outer cermet is good in the case where cermet B is used. This is considered to be because the difference in thermal expansion coefficient between the core material and the outer skin is 18%, which is less than 20%.
第３図の写真から、サーメッ）Ｃを使用したものは、芯
材と外皮サーメットとの接合界面に拡散層とオーステナ
イト層が存在し、良好な接合となっている。この場合、
芯材と外皮サーメットとの熱膨張率差が５％と小さくな
っているとともに、Ｎｉ、 Ｃｒともに５ｗｔ％以上３
０％以下の範囲内であるためと考えられる。From the photograph in FIG. 3, it can be seen that in the case of using cermet C, there is a diffusion layer and an austenite layer at the bonding interface between the core material and the outer cermet, resulting in a good bond. in this case,
The difference in thermal expansion coefficient between the core material and the outer cermet is as small as 5%, and both Ni and Cr are 5wt% or more3.
This is considered to be because it is within the range of 0% or less.
以上より芯材の熱膨張率が、外皮の熱膨張率より＋２０
％以下であれば外皮が強く、かつ割れもなく接合される
ことがわかる。なお前記熱膨張率の差が、−２０％以内
であっても力の作用状態は同様であるので、同じく好ま
しい接合状態となる。From the above, the thermal expansion coefficient of the core material is +20 than the thermal expansion coefficient of the outer skin.
% or less, it can be seen that the outer skin is strong and can be joined without cracking. Note that even if the difference in the coefficient of thermal expansion is within -20%, the force is applied in the same manner, resulting in a similarly preferable bonding state.
なお前記実施例の芯材として、ＳＣＭ ４４Ｇを使用し
たが、その他の材料で熱膨張率がほぼ同一になるＹ Ｈ
Ｄ ５０、ＨＲＡ ２Ｂ８合金でも、合金の性質上、同
様に外皮を芯材外周に望ましく形成できる。Although SCM 44G was used as the core material in the above example, other materials may have almost the same coefficient of thermal expansion.
D 50 and HRA 2B8 alloys can also desirably form an outer skin around the core material due to the properties of the alloy.
「実施例２」
次にサーメット中のＴ１ＣＮ、 Ｃｒｚ Ｃ２）Ｍｏ２
Ｃ、ｗｃ、ｖｃからなる硬質相成分と、Ｆｅ、 Ｇｏ
、 Ｃｒ、Ｗ、Ｎｏからなる結合相成分との重量割合を
変更することにより、それぞれの硬度と抗折力とを測定
して第３表に示した。"Example 2" Next, T1CN in cermet, Crz C2)Mo2
Hard phase components consisting of C, wc, and vc, and Fe, Go
The hardness and transverse rupture strength of each sample were measured by changing the weight ratio with the binder phase component consisting of Cr, W, and No, and are shown in Table 3.
第３表から硬質相が３０％未満だと硬度が小さくて耐摩
耗性に劣り、硬質相が９５％を越えて含有すると抗折力
が小さくなって靭性が劣る。よってサーメットの硬質相
は、３０ｗｔ％以上９５ｗｔ％以下が望ましい。Table 3 shows that if the hard phase content is less than 30%, the hardness is low and the wear resistance is poor, and if the hard phase content exceeds 95%, the transverse rupture strength is small and the toughness is poor. Therefore, the hard phase of the cermet is desirably 30 wt% or more and 95 wt% or less.
「実施例３」
複合サーメットロールの耐酸化性を調べるため、第４表
の７種類の組成のサーメットを使用したロールについて
それぞれ室温から１０００℃に加熱した場合の酸化増量
を測定して、その結果を第５表に示した。なお第４表の
サーメッ）Ａ−Ｃは、第１表のＡ−Ｃに対応するものと
同一である。"Example 3" In order to investigate the oxidation resistance of composite cermet rolls, the oxidation weight gain was measured when each roll using cermets with the seven types of compositions shown in Table 4 was heated from room temperature to 1000°C, and the results were are shown in Table 5. Note that cermets A to C in Table 4 are the same as those corresponding to A to C in Table 1.
サーノｙ ｈ Ａは、硬質相１）ＣＨＣｚが６ｗｔ％で
、酸化増量が２８Ｘ１０−２層ｇ／ｍｔｓ”であり、耐
酸化性に劣る。サーメットＢは硬質相のＣｒ３Ｃ２が２
１ｗｔ％であって２０ｗｔ％以上であり、酸化増量１５
ＸｉＯ−２／ｒａｔｓ”であり、耐酸化性を有する。ま
たサーメットＣは、硬質相のＣｒ３Ｃ２が２４ｗｔ％テ
醜化＃ＩＩ量１１×１０−２／ｌ１１１１２ と少なく
、耐酸化性は良好である。Cermet B has a hard phase 1) CHCz of 6 wt% and an oxidation weight gain of 28X10-2 layer g/mts, which is poor in oxidation resistance.Cermet B has a hard phase of Cr3C2 of 2
1 wt% and 20 wt% or more, and the oxidation weight increase is 15
Cermet C has a hard phase of Cr3C2 of 24 wt% and a low amount of oxidation #II of 11×10-2/l11112, and has good oxidation resistance.
サーメットＤは、硬質相のＣｒ１Ｃ２が２４ｖｔ％であ
るが酸化増量が２４Ｘ ｌ（１−２ｍｇ／ ｍ＋ｓ”で
あり、耐酸化性は劣る。これはサーメッ）Ｄの結合相が
重量％でＮｉ ４ｗｔ％、Ｏｒ ４ｗｔ％とともに５％
より少ないために＃酸化性が低下していると考えられる
。Cermet D has a hard phase of Cr1C2 of 24wt%, but the oxidation weight increase is 24X l (1-2mg/m+s), and its oxidation resistance is poor. , Or 5% with 4wt%
# It is considered that the oxidizing property is decreased because the amount is less.
サーメットＥは、硬質相のＣｒ３Ｃ２が２４ｗｔ％にな
っているので酸化増量は９Ｘ １０−２ｍｇ／ ａｍ”
であり、＃酸化性を有するが、結合相が重量％でＮｉ
５ａｔ％、Ｃｒ ３１ ｗｔ％であってＣｒが３０％以
上以上型れるので抗折力が５１ｋｚ／ｍｍ”であっで、
サーメットＣの場合が１９０ｋｇ／ ｍ ｍ ２である
のに比較して大幅に劣り望ましくない。Cermet E has a hard phase of Cr3C2 of 24 wt%, so the oxidation weight gain is 9X 10-2 mg/am.
# has oxidizing properties, but the binder phase is Ni by weight%
5 at% and 31 wt% of Cr, and since Cr is more than 30%, the transverse rupture strength is 51 kHz/mm".
Compared to the case of Cermet C, which is 190 kg/m 2 , it is significantly inferior and undesirable.
さらにサーメー７トＦは、硬質相のＣｒワＣ３が２４ｗ
ｔ％になっているので酸化増量はＩＱＸ １０１０−２
ｒ／ｌｌ１１２であり、耐酸化性は良好である。サーメ
ットＧは、硬質相のＣｒ３Ｃ２とＣｒ７Ｃ３との合計が
２４ｗｔ％になっているので酸化増量は ＩＩＸ １０
”２ｍｇ７層１１２であり、耐酸化性は良好である。ま
たサーフ−２トＨは、硬質相のＣｒ７Ｃ３と（Ｃｒ、Ｆ
ｅ） ７ Ｃ３との合計が２４ｗｔ％になっているので
酸化増量は１１Ｘ １０’ ｒｔｒｇ／ ■”であり、
耐酸化性は良好である。Furthermore, Thermate 7F has a hard phase of Cr wax C3 of 24w.
Since it is t%, the oxidation increase is IQX 1010-2
r/ll112, and the oxidation resistance is good. Cermet G has a total of 24 wt% of the hard phase Cr3C2 and Cr7C3, so the oxidation weight increase is IIX 10
"2mg7 layer 112, and has good oxidation resistance. Surf-2t H also has a hard phase of Cr7C3 and (Cr, F
e) Since the total amount with 7C3 is 24wt%, the oxidation weight increase is 11X 10'rtrg/■'',
Oxidation resistance is good.
以上より外皮サーメットにおいて耐酸化性を有するには
、硬質相のＣｒｌ Ｃ２）Ｃｒ７ Ｃ１、（Ｃｒ、Ｆｅ
）７Ｃ３の合計が２０ｗｔ％以上であることが望ましい
。またＮｉ、 Ｃｒは、それぞれ５ｗｔ％以上であるこ
とが望ましいが、その量が多すぎると耐靭性が劣るので
、３０ｗｔ％以下が望ましい。From the above, in order for the outer skin cermet to have oxidation resistance, the hard phase Crl C2) Cr7 C1, (Cr, Fe
) It is desirable that the total amount of 7C3 is 20 wt% or more. Further, it is desirable that Ni and Cr are each 5 wt% or more, but if the amount is too large, the toughness will be poor, so it is desirable that the content be 30 wt% or less.
「発明の効果」
本発明の複合サーメットロールは、芯材とその外皮サー
メットとのそれぞれの熱膨張率の差を２０％以下にする
ことにより、芯材と外皮との界面での残留応力を緩和さ
せるとともに両者の接合を強固にできるので、熱間圧延
装置に使用されても割れや接合不良の問題を防止できる
。また芯材を溶解法による合金製としたので、複合サー
メットロールは靭性を有し、しかも外皮サーメットの硬
質相成分を３０ｗｔ％以上９５ｗｔ％以下としたことに
よりロールとして優れた耐摩耗性を有する。さらに硬質
相中にクロム炭化物を多く含ませることにより、外皮サ
ーメットは耐食性、耐酸化性を有する。"Effects of the Invention" The composite cermet roll of the present invention alleviates residual stress at the interface between the core material and the outer skin by reducing the difference in thermal expansion coefficient between the core material and the outer skin cermet to 20% or less. At the same time, the bonding between the two can be made strong, so even when used in a hot rolling machine, problems such as cracking and poor bonding can be prevented. Furthermore, since the core material is made of an alloy made by a melting method, the composite cermet roll has toughness, and since the hard phase component of the outer cermet is 30 wt% or more and 95 wt% or less, the roll has excellent wear resistance. Furthermore, by including a large amount of chromium carbide in the hard phase, the outer cermet has corrosion resistance and oxidation resistance.
第１．２．３図は、それぞれ本発明の異なる実施例の複
合サーメットロールをそれぞれ切断した芯材と外皮との
接合部を示す顕微鏡金属組織写真である。Figures 1.2.3 are microscopic metallographic photographs showing the joints between the core material and the outer skin, which are obtained by cutting composite cermet rolls of different embodiments of the present invention.
Claims (6)
に、常温から１０００℃までの温度における熱膨張率差
が前記合金の熱膨張率の±２０％以下であるサーメット
の外皮を形成したことを特徴とする複合サーメットロー
ル。(1) The outer surface of the roll core material made of an alloy manufactured by the melting method is coated with a cermet outer skin whose thermal expansion coefficient difference at temperatures from room temperature to 1000°C is less than ±20% of the thermal expansion coefficient of the alloy. A composite cermet roll characterized by forming.
、鉄を主成分とする合金製であることを特徴とする複合
サーメットロール。(2) A composite cermet roll according to claim 1, wherein the core material of the roll is made of an alloy whose main component is iron.
の硬質相が、IVａ、Ｖａ、VIａ属元素からなる炭化物、
窒化物の一種以上からなり、硬質相の合計重量がサーメ
ット重量の３０％以上９５％以下であり、残部の結合相
がＦｅ、Ｎｉ、Ｃｏ、Ｃｒ、Ｗ、Ｍｏの一種以上及び、
不可避不純物よりなることを特徴とする複合サーメット
ロール。(3) In claim 1, the hard phase of the outer cermet is a carbide consisting of elements of groups IVa, Va, and VIa,
consisting of one or more types of nitrides, the total weight of the hard phase is 30% to 95% of the cermet weight, and the remaining binder phase is one or more of Fe, Ni, Co, Cr, W, Mo, and
A composite cermet roll characterized by comprising unavoidable impurities.
の硬質相の２０重量％以上が、Ｃｒ＿３Ｃ＿２、Ｃｒ＿
７Ｃ＿３、（Ｃｒ、Ｆｅ）＿７Ｃ＿３の一種又は二種以
上からなることを特徴とする複合サーメットロール。(4) In claim 3, 20% by weight or more of the hard phase of the outer skin cermet is Cr_3C_2, Cr_
A composite cermet roll comprising one or more of 7C_3 and (Cr, Fe)_7C_3.
メットの結合相は、重量％で５≦Ｃｒ≦３０、５≦Ｎｉ
≦３０、残部がＦｅおよび不可避不純物で構成されるこ
とを特徴とする複合サーメットロール。(5) In claims 3 and 4, the binder phase of the cermet is 5≦Cr≦30, 5≦Ni in weight%.
≦30, the balance being composed of Fe and unavoidable impurities.
との界面に、サーメットを構成する結合相の重量比率よ
りも量の多い界面相が存在することを特徴とする複合サ
ーメットロール。(6) A composite cermet roll according to claims 1 to 5, characterized in that an interfacial phase exists in an amount greater than the weight ratio of the binder phase constituting the cermet at the interface between the core material and the outer skin. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24739187A JP2648307B2 (en) | 1987-09-30 | 1987-09-30 | Composite cermet roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24739187A JP2648307B2 (en) | 1987-09-30 | 1987-09-30 | Composite cermet roll |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0191902A true JPH0191902A (en) | 1989-04-11 |
| JP2648307B2 JP2648307B2 (en) | 1997-08-27 |
Family
ID=17162731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24739187A Expired - Fee Related JP2648307B2 (en) | 1987-09-30 | 1987-09-30 | Composite cermet roll |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2648307B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105522138A (en) * | 2015-11-11 | 2016-04-27 | 丹阳恒庆复合材料科技有限公司 | Technique and equipment for forged steel roll neck high-chrome cast iron composite roller |
-
1987
- 1987-09-30 JP JP24739187A patent/JP2648307B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105522138A (en) * | 2015-11-11 | 2016-04-27 | 丹阳恒庆复合材料科技有限公司 | Technique and equipment for forged steel roll neck high-chrome cast iron composite roller |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2648307B2 (en) | 1997-08-27 |
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