JPH03254304A - Wear resistance conjugated roll - Google Patents
Wear resistance conjugated rollInfo
- Publication number
- JPH03254304A JPH03254304A JP2049032A JP4903290A JPH03254304A JP H03254304 A JPH03254304 A JP H03254304A JP 2049032 A JP2049032 A JP 2049032A JP 4903290 A JP4903290 A JP 4903290A JP H03254304 A JPH03254304 A JP H03254304A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- outer layer
- roll
- less
- wear
- 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
- 239000000463 material Substances 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 239000011162 core material Substances 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims description 28
- 239000012535 impurity Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 229910052721 tungsten Inorganic materials 0.000 claims 1
- 238000005096 rolling process Methods 0.000 abstract description 24
- 238000007788 roughening Methods 0.000 abstract description 3
- 239000010953 base metal Substances 0.000 abstract 2
- 230000000052 comparative effect Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 150000001247 metal acetylides Chemical class 0.000 description 12
- 239000000203 mixture Substances 0.000 description 9
- 230000004907 flux Effects 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 230000003746 surface roughness Effects 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000009750 centrifugal casting Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910001141 Ductile iron Inorganic materials 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
-
- 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
-
- 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
- B21B27/02—Shape or construction of rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/008—Continuous casting of metals, i.e. casting in indefinite lengths of clad ingots, i.e. the molten metal being cast against a continuous strip forming part of the cast product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、耐摩耗複合ロールに関し、特に高強度で耐摩
耗性、針肌あれ性に優れた耐摩耗複合ロールに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wear-resistant composite roll, and particularly to a wear-resistant composite roll that has high strength, excellent wear resistance, and excellent needle surface roughness.
〔従来の技術及び発明が解決しようとする課題〕圧延用
ロールに対する耐摩耗性及び針肌あれ性の要求はますま
す厳しいものになってきている。[Prior art and problems to be solved by the invention] Requirements for abrasion resistance and needle surface roughness for rolling rolls are becoming increasingly severe.
これは、これらのロール損耗による被圧延材の形状悪化
の防止とともに、ロール組替工数の低減の要求が強いた
めである。従来の遠心鋳造ロールでは、外層材の重力偏
析の抑制や軸となる鋳鉄材の黒鉛化をはかって、靭性の
維持をするために、外層材の化学組成に制約があり、上
述のような要求を十分に満たすことはできなかった。そ
こで、本発明者らは、外層材の化学組成の制約が少ない
新しいロール製造方法として、鋼材からなる芯材の周囲
に高周波コイルを用いて連続的に外層を形成するいわゆ
る連続肉盛鋳造法によるものを提案した（特開昭６１−
６０２５６号、特願昭６３−５０２７０２号）。This is because there is a strong demand to prevent deterioration of the shape of the rolled material due to wear of these rolls and to reduce the number of man-hours required for changing rolls. With conventional centrifugal casting rolls, there are restrictions on the chemical composition of the outer layer material in order to maintain toughness by suppressing gravity segregation of the outer layer material and graphitizing the cast iron material that forms the shaft. could not be fully satisfied. Therefore, the present inventors developed a new roll manufacturing method that has fewer restrictions on the chemical composition of the outer layer material, using the so-called continuous overlay casting method, in which the outer layer is continuously formed using a high-frequency coil around a core material made of steel. proposed something (Unexamined Japanese Patent Publication No. 1983-
No. 60256, Japanese Patent Application No. 63-502702).
このような製造方法の開発により、硬質の炭化物を形成
するＶ、ＷＳＭｏ等の元素を外層材に多量に添加できる
ようになり、従来の遠心鋳造ロールと比較して数倍の耐
用圧延量を有するロールの製造が可能となったのである
。しかしながらこのようなロールにおいても針肌あれ性
の点では、必ずしも十分に満足されるものではなく、ロ
ールの使用条件によっては、肌あれが生じて耐用圧延量
が従来の遠心鋳造ロールの２倍程度にとどまることもあ
った口
そこで本発明者らは、針肌あれ性の向上とロール組織に
ついて検討した結果、上記耐摩耗複合ロールノ肌あれ現
象はロール材のミクロ組織と密接な関係があり、これを
改善、制御することにより、針肌あれ性を向上できるこ
とを見出した。The development of such a manufacturing method has made it possible to add large amounts of elements such as V and WSMo that form hard carbides to the outer layer material, resulting in a rolling capacity several times greater than that of conventional centrifugal casting rolls. This made it possible to manufacture rolls. However, even such rolls are not necessarily fully satisfactory in terms of needle surface roughness, and depending on the usage conditions of the roll, surface roughness may occur and the rolling capacity may be approximately twice that of conventional centrifugal casting rolls. Therefore, the present inventors investigated the improvement of needle surface roughness and the roll structure, and found that the roughness phenomenon of the above-mentioned wear-resistant composite roll is closely related to the microstructure of the roll material. It has been found that by improving and controlling this, it is possible to improve the roughness of the needle skin.
そして組織中の非粒状、特に網目状に生成する炭化物が
多く存在すると、この炭化物の部位に優先的にクラック
が発生、進展し、肌あれほこのようなりラックを起点と
して発生することがわかった。It was also found that when there are a large number of non-granular, especially mesh-like, carbides in the structure, cracks preferentially occur and propagate in the carbide areas, with cracks starting from the racks, which look like irregularities on the skin. .
従って本発明の目的は耐摩耗性が良好であるとともに、
針肌あれ性に優れた耐摩耗複合ロールを提供することで
ある。Therefore, the object of the present invention is to provide good wear resistance and
To provide a wear-resistant composite roll with excellent needle surface roughness.
上記目的に鑑み鋭意研究の結果、本発明者らは、耐摩耗
複合ロールの外層の肌あれ防止のためには、外層材中の
非粒状の炭化物量を低位に抑え、粒状炭化物をある程度
含有させればよいことを見出し、本発明に想到した。As a result of intensive research in view of the above objectives, the present inventors have found that in order to prevent roughening of the outer layer of the wear-resistant composite roll, the amount of non-granular carbide in the outer layer material should be kept to a low level, and the amount of granular carbide should be contained to a certain extent. The inventors have found that it is sufficient to do so, and have come up with the present invention.
すなわち、本発明の耐摩耗複合ロールは、面積比で、粒
状炭化物５〜３０％と、非粒状炭化物５％以下とを含有
する組織からなり、かつ基地の硬さがビッカース硬さ
（Ｈｖ） ５５０以上の外層材と、鋼製の芯材とからな
ることを特徴とする。That is, the wear-resistant composite roll of the present invention has a structure containing 5 to 30% of granular carbide and 5% or less of non-granular carbide in area ratio, and the hardness of the base is Vickers hardness.
(Hv) It is characterized by consisting of an outer layer material of 550 or more and a steel core material.
以下に本発明の詳細な説明する。The present invention will be explained in detail below.
本発明において粒状炭化物とは、ＭＣ，Ｍ、Ｃ３等であ
られされる炭化物のことである。前記粒状炭化物は一般
に高い硬度を有する。外層材中上記粒状炭化物の含有量
は面積率で５〜３０％である。粒状炭化物の含有量が５
％未満では十分な耐摩耗性向上の効果がなく、３０％を
超えると均一に分散するのが困難となる。In the present invention, granular carbide refers to carbide made of MC, M, C3, etc. The granular carbide generally has high hardness. The content of the granular carbide in the outer layer material is 5 to 30% in terms of area ratio. Granular carbide content is 5
If it is less than 30%, there will be no sufficient effect of improving wear resistance, and if it exceeds 30%, it will be difficult to uniformly disperse it.
また本発明において、非粒状炭化物とは、Ｍ２．［：、
、Ｍ−Ｃ３、Ｍ２Ｃ、Ｍ、Ｃ等で表される共晶炭化物が
成長することにより形成される非粒状組織のことである
。外層材中の上記非粒状炭化物の含有量は、面積率で５
％以下である。非粒状炭化物の含有量が５％を超えると
、クラックが発生しやすくなり、針肌あれ性が低下する
。Furthermore, in the present invention, non-granular carbide refers to M2. [:,
, M-C3, M2C, M, C, etc., is a non-granular structure formed by the growth of eutectic carbides. The content of the above-mentioned non-granular carbide in the outer layer material is 5 in terms of area ratio.
% or less. If the content of non-granular carbide exceeds 5%, cracks are likely to occur and the roughness of the needle surface is reduced.
また基地の硬さはビッカース硬さ （ｆｌｙ）で、５５
０以上である。基地のビッカース硬さが５５０未満であ
ると耐摩耗性が低下する。The hardness of the base is Vickers hardness (fly), which is 55
It is 0 or more. If the Vickers hardness of the base is less than 550, wear resistance will decrease.
粒状炭化物及び非粒状炭化物を上述の面積率で含有する
組織を有し、上記ビッカース硬さを有するには、具体的
には以下の組成の材質を外層とするのが好ましい。すな
わちその外層の化学成分はＣ１，０〜３．５重量％、Ｓ
ｉ３．０重量％以下、Ｍｎ１．５重量％以下、Ｃｒ２〜
１０重量％、ＭＯ９重量％以下、Ｗ２０重量％以下、７
２〜１５重量％、ＰＯ６０８重量％以下、Ｓ Ｏ，０６
重量％以下、残ｉＦｅ及び不純物元素からなる。In order to have a structure containing granular carbide and non-granular carbide at the above-mentioned area ratio and to have the above-mentioned Vickers hardness, specifically, it is preferable to use a material having the following composition as the outer layer. That is, the chemical components of the outer layer are C1.0 to 3.5% by weight, S
i 3.0% by weight or less, Mn 1.5% by weight or less, Cr2~
10% by weight, MO 9% by weight or less, W 20% by weight or less, 7
2-15% by weight, PO608% by weight or less, SO,06
Less than % by weight consists of remaining iFe and impurity elements.
特に上記外層の化学成分において、非粒状炭化物の量を
面積率で５％以下に抑制するには、不純物元素としての
Ｂの含有量を３００ｐｐｍ以下にするのが好ましい。In particular, in the chemical components of the outer layer, in order to suppress the amount of non-granular carbides to 5% or less in terms of area ratio, it is preferable that the content of B as an impurity element is 300 ppm or less.
耐摩耗複合ロールの外層の化学成分の限定理由は以下の
通りである。The reasons for limiting the chemical components of the outer layer of the wear-resistant composite roll are as follows.
Ｃは耐摩耗性向上のための炭化物の形成に必要である。C is necessary for forming carbides to improve wear resistance.
その量が１，０重量％未満の場合、晶出炭化物量が少な
く、耐摩耗性の点で十分でない。When the amount is less than 1.0% by weight, the amount of crystallized carbide is small and the wear resistance is not sufficient.
方Ｃが３．５重量％を超えると炭化物量が過剰になり、
材質が脆化する。When the amount of C exceeds 3.5% by weight, the amount of carbide becomes excessive,
The material becomes brittle.
Ｓｌは脱酸剤として必要な元素である。また溶湯の流動
性を保つためにも必要である。その量が３゜０重量％を
超えると脆化しやすくなり不都合である。Sl is an element necessary as a deoxidizing agent. It is also necessary to maintain the fluidity of the molten metal. If the amount exceeds 3.0% by weight, it tends to become brittle, which is disadvantageous.
Ｍｎは脱酸作用とともに不純物であるＳをＭｎＳとして
固定する作用がある。その量が１．５重量％を超えると
残留オーステナイトが生じゃすくなり、安定して十分な
硬さを維持できない。Mn has a deoxidizing effect as well as an effect of fixing S, which is an impurity, as MnS. If the amount exceeds 1.5% by weight, the retained austenite becomes brittle and cannot maintain sufficient hardness stably.
Ｃｒは２重量％未満では焼入れ性に劣り、また１０重量
％を超えるとクロム系炭化物が過多となるため不都合で
ある。すなわちＣｒ系炭化物例えばＭ。Ｃ６はＭＣ５Ｍ
、Ｃ，、Ｍ２Ｃと比較して硬さが低く、耐摩耗性を低下
させる。If Cr is less than 2% by weight, hardenability is poor, and if it exceeds 10% by weight, chromium-based carbide becomes excessive, which is disadvantageous. That is, Cr-based carbide, for example M. C6 is MC5M
, C, , has lower hardness than M2C and reduces wear resistance.
旧は焼入れ性と高温硬さを得るために必要であるが、９
重量％を超えるとＣとＶとＭ。とのバランスにおいてＭ
、Ｃ系炭化物が増加し、靭性および針肌あれ性の点で好
ましくないので、Ｍ、含有量の上限は９重量％である。The former is necessary to obtain hardenability and high temperature hardness, but 9
If it exceeds the weight percentage, C, V and M. M in balance with
, C-based carbide increases, which is unfavorable in terms of toughness and roughness, so the upper limit of the M content is 9% by weight.
Ｗは高温硬さの維持の点で必要であるが、２０重量％を
超えるとＭ、Ｃ系炭化物が増加して靭性及び針肌あれ性
の点で好ましくないので、上限を２０重量％とする。W is necessary to maintain high-temperature hardness, but if it exceeds 20% by weight, M and C-based carbides increase, which is undesirable in terms of toughness and roughness, so the upper limit is set at 20% by weight. .
■は耐摩耗性の向上に効果のあるＭＣ系炭化物を形成す
るための必須元素である。従って２重量％未満では十分
な効果がなく、また１５重量％より多いと、溶湯の酸化
が激しくなり、大気中での溶解が困難になってくる。(2) is an essential element for forming MC-based carbides that are effective in improving wear resistance. Therefore, if it is less than 2% by weight, there is no sufficient effect, and if it is more than 15% by weight, the oxidation of the molten metal becomes severe and it becomes difficult to dissolve it in the atmosphere.
上記元素以外、鉄基合金は不純物を除いて実質的に鉄か
らなる。不純物として主なものはＰ及びＳであるが、Ｐ
は脆化防止のため０．０８重量％以下であり、Ｓは同様
に０．０６重量％以下であるのがよい。In addition to the above elements, the iron-based alloy consists essentially of iron excluding impurities. The main impurities are P and S, but P
is preferably 0.08% by weight or less to prevent embrittlement, and similarly S is preferably 0.06% by weight or less.
さらに不純物としては、微量のＢが含まれる。Furthermore, a trace amount of B is included as an impurity.
Ｂは基地中の非粒状炭化物の生成を助長し、かつその中
に濃縮され、それを脆化する。脆化されたネットワーク
状炭化物にそってマイクロクラックが生じ、そのクラッ
クを起点にして結晶粒単位で脱落摩耗を促進し、肌あれ
を生じるので、不純物としてのＢの量を制限しなくては
ならない。その濃度が３００ｐｐｍ以下の場合には基地
中に非粒状炭化物の生成が助長されず、共晶炭化物に沿
って発生するクラックもほとんど認められない。B promotes the formation of non-granular carbides in the matrix and is concentrated therein, making it brittle. Microcracks occur along the embrittled network-like carbide, and starting from these cracks, the wear and tear of crystal grains is accelerated, resulting in rough skin, so the amount of B as an impurity must be limited. . When the concentration is 300 ppm or less, the formation of non-granular carbides in the matrix is not promoted, and almost no cracks are observed along the eutectic carbides.
本発明の耐摩耗複合ロールの外層には、上記各成分の他
に必要に応じてＮ１、Ｃ０． Ｎｂを添加することがで
きる。In addition to the above-mentioned components, the outer layer of the wear-resistant composite roll of the present invention contains N1, C0. Nb can be added.
Ｎｉは焼入れ性を向上させる作用を有する。このため、
特に大型ロールのような焼入れ速度を速くできないもの
には添加するのが好ましい。しかしその含有量が５重量
％を超えると、オーステナイトが安定化しすぎ、熱処理
後の残留オーステナイトが過多となり、十分な硬さが得
られない。Ni has the effect of improving hardenability. For this reason,
It is particularly preferable to add it to large rolls where the quenching speed cannot be increased. However, if the content exceeds 5% by weight, the austenite becomes too stable and there is too much residual austenite after heat treatment, making it impossible to obtain sufficient hardness.
Ｃｏは、材質の靭性を向上させ、かつ熱間硬さを向上さ
せる作用がある。従ってＣｏを添加することにより針肌
あれ性、耐摩耗性の向上をはかることができる。上記向
上効果はその含有量が５重量％で、はぼ飽和することか
ら、その上限は５重量％である。Co has the effect of improving the toughness and hot hardness of the material. Therefore, by adding Co, it is possible to improve needle surface roughness and abrasion resistance. The above-mentioned improvement effect is almost saturated at a content of 5% by weight, so the upper limit is 5% by weight.
ＮｂはＶと同様に粒状炭化物を形成する。さらに粒状炭
化物であるＭＣ炭化物を微細にする作用を有する。これ
により、耐摩耗性、針肌あれ性を改善する。しかしその
含有量が５重量％を超えると溶湯の酸化が激しくなり、
大気中での溶解、鋳造が困難になる。Like V, Nb forms granular carbides. Furthermore, it has the effect of making MC carbide, which is a granular carbide, finer. This improves abrasion resistance and roughness of needle skin. However, if its content exceeds 5% by weight, the oxidation of the molten metal will become intense.
Melting and casting in the atmosphere becomes difficult.
本発明の耐摩耗複合ロールの芯材は鋳鋼や鍛鋼等の鋼材
を用いるが、この組成は一般的に用いられているもので
良く、特に制限されない。The core material of the wear-resistant composite roll of the present invention is made of steel such as cast steel or forged steel, but the composition thereof is not particularly limited and may be any commonly used material.
上述の組成の外層と、鋼製の芯材とからなる耐摩耗複合
ロールを魁造するには、通常の連続肉盛鋳造法により、
芯材のまわりに外層を形成した後、所望の形状に加工す
ればよいが、本発明のようにＢの含有量を３００ｐｐｍ
以下とするためには、肉盛前の芯材表面の被覆及び外層
用溶湯表面の被覆に使用するフラックスとして、Ｂ又は
Ｂ化合物を含まないものを使用するのが好ましい。In order to manufacture a wear-resistant composite roll consisting of an outer layer with the above composition and a steel core material, a normal continuous overlay casting method is used.
After forming the outer layer around the core material, it may be processed into a desired shape, but as in the present invention, the B content may be 300 ppm.
In order to achieve the following, it is preferable to use a flux that does not contain B or a B compound as the flux used to cover the surface of the core material before overlaying and to cover the surface of the molten metal for the outer layer.
このようなフラックスとしては、５１０２、Ｎａ２Ｏ及
び／又はに２０、その他Ｂ以外の金属の酸化物からなる
ものを適宜含有させる。Such a flux may appropriately contain 5102, Na2O and/or Ni20, and other oxides of metals other than B.
上記フラックスの作用は以下の通りである。The action of the above flux is as follows.
ＳｉＯ□はフラックスの主成分として好適な材料であり
、高温でも分解することなく安定して溶湯を被覆する。SiO□ is a material suitable as the main component of flux, and it stably coats the molten metal without decomposing even at high temperatures.
またＳｉ口２は耐火性を良好にする作用を有する。Moreover, the Si port 2 has the effect of improving fire resistance.
Ｎａ２Ｏとに、［］はともに５１０２のネットワークを
切断し、フラックスの流動性を向上させる働きがある。Both [] and Na2O have the function of cutting the 5102 network and improving the fluidity of the flux.
さらに上記の成分の他にＢ以外の金属酸化物を適宜加え
、これによってフラックスの流動性や表面張力を調節し
、望むフラックスとする。Furthermore, in addition to the above-mentioned components, metal oxides other than B are appropriately added to adjust the fluidity and surface tension of the flux to obtain a desired flux.
本発明の耐摩耗複合ロールは、針肌あれ性が向上してい
るとともに、耐摩耗性が良好である。このような効果が
得られる理由は、肌あれの原因となる非粒状炭化物の量
を少なく限定しているとともに、外層の基地においてＶ
Ｃ等の粒状炭化物の量の減少を防止し、かつ基地の硬さ
もある程度以上であるためと考えられる。The wear-resistant composite roll of the present invention has improved needle surface roughness and good wear resistance. The reason for this effect is that the amount of non-granular carbides that cause rough skin is limited to a small amount, and the V
This is thought to be because the amount of granular carbide such as C is prevented from decreasing and the hardness of the base is above a certain level.
本発明を以下の実施例によりさらに詳細に説明する。 The present invention will be explained in further detail by the following examples.
実施例１．２及び比較例１．２
鋼製の軸材と、第１表に示す組成の外層材用溶湯を用い
て、連続肉盛鋳造法により胴径３５０ ｍｍφ、胴長６
００ ｍｍのロールを鋳造し、熱処理を施した後、表面
をそれぞれ第２表に模式的に示すような孔型の形状に加
工し、条鋼圧延用複合ロールを作製した。Example 1.2 and Comparative Example 1.2 A steel shaft material and a molten metal for the outer layer material having the composition shown in Table 1 were used to form a shell with a diameter of 350 mmφ and a length of 6 by continuous overlay casting.
00 mm rolls were cast and heat treated, and then the surfaces of each roll were processed into a hole shape as schematically shown in Table 2 to produce a composite roll for rolling long steel.
また比較のためにＢ含有量が３００ｐｐｍより多い組成
の外層材溶湯を用いて、各実施例と同様の形状の条鋼圧
延用複合ロールを作成したく比較例１．２）。さらに従
来の鋳鉄材である合金ダクタイル鋳鉄を用いて、各実施
例と同様の形状の条鋼圧延用ロールを作製した（従来例
１．２）。For comparison, a composite roll for rolling long steel having the same shape as each example was created using a molten outer layer material having a composition with a B content of more than 300 ppm (Comparative Example 1.2). Further, using alloy ductile cast iron, which is a conventional cast iron material, a long bar rolling roll having the same shape as in each of the examples was manufactured (Conventional Example 1.2).
第１図に実施例１のロールと比較例１のロールの外層の
ミクロ組織の写真を示す。FIG. 1 shows photographs of the microstructures of the outer layers of the roll of Example 1 and the roll of Comparative Example 1.
実施例１のロールの組織は比較例１のそれと比べて、ネ
ットワーク状の非粒状炭化物がかなり少なくなっている
。The structure of the roll of Example 1 has considerably less network-like non-granular carbide than that of Comparative Example 1.
なお、上記各実施例及び比較例において、熱処理として
は１０４０℃の焼入れと、５３０℃で３回の焼戻しを行
った。In each of the above Examples and Comparative Examples, the heat treatment was quenching at 1040°C and tempering at 530°C three times.
次に、これらの条鋼圧延用ロールの実機による圧延試験
を行った。Next, a rolling test was conducted using an actual machine using these long steel rolling rolls.
圧延試験は、ロール−回の改削で何トンの圧延ができる
かを測定し、対応する各従来例の条鋼圧延用複合ロール
より何倍の圧延ができたかその増加率を示した。In the rolling test, the number of tons that could be rolled by changing the number of rolls was measured, and the rate of increase was shown as how much more could be rolled than the corresponding conventional composite roll for rolling steel strips.
結果を第２表に合わせて示す。The results are also shown in Table 2.
また各実施例及び比較例のロールの外層材の、粒状炭化
物及び非粒状炭化物の面積率、ショアー硬さ及び抗折力
を測定した。In addition, the area ratio of granular carbide and non-granular carbide, Shore hardness, and transverse rupture strength of the outer layer material of the roll of each Example and Comparative Example were measured.
結果を第３表に示す。The results are shown in Table 3.
第
２
表
第２表より各実施例の条鋼圧延用複合ロールは、従来例
（合金ダクタイル鋳鉄）による条鋼圧延用ロールに比べ
大幅に圧延量が増加しており、合金ダクタイル鋳鉄ロー
ルの２倍以上の耐用性があるのがわかる。また各比較例
の複合ロールよりも圧延量が増加している。これはＢ含
有量が３００ｐｐｍを超える比較例のより針肌あれ性が
向上しているためである。Table 2 From Table 2, the rolling amount of the composite roll for rolling long steel of each example is significantly increased compared to the roll for rolling long steel of the conventional example (alloy ductile cast iron), which is more than twice that of the alloy ductile cast iron roll. It can be seen that it has durability. Moreover, the amount of rolling is increased compared to the composite rolls of each comparative example. This is because the roughness of needle skin is improved compared to the comparative example in which the B content exceeds 300 ppm.
実施例３及び比較例３
鋼製の軸材と、第４表に示す組成の外層材用溶湯を用い
て、連続肉盛鋳造法により胴径６００ ｍｍφ、胴長１
８００ｍｍのロールを鋳造し、熱処理を施し、熱間薄板
圧延用複合ロールを作製した。Example 3 and Comparative Example 3 Using a steel shaft material and a molten metal for the outer layer material having the composition shown in Table 4, a body with a diameter of 600 mmφ and a body length of 1 was formed by continuous overlay casting.
A roll of 800 mm was cast and heat treated to produce a composite roll for hot thin plate rolling.
また比較のために従来の遠心鋳造法により、第４表に示
す組成の合金グレンロールを作製した（比較例３）。For comparison, an alloy grain roll having the composition shown in Table 4 was produced by a conventional centrifugal casting method (Comparative Example 3).
これらのロールを実機圧延機のＦ４スタンドのワークロ
ールとして使用した。その後各ロールのＩＤ００を圧延
当りの摩耗量を測定した。These rolls were used as work rolls for the F4 stand of an actual rolling mill. Thereafter, the amount of wear per rolling was measured using ID00 of each roll.
結果を第４表に合わせて示す。The results are also shown in Table 4.
また実施例３及び比較例３のロールの粒状炭化物及び非
粒状炭化物の面積率、ショアー硬さを測定した。結果を
第４表に合わせて示す。In addition, the area ratio of granular carbide and non-granular carbide and Shore hardness of the rolls of Example 3 and Comparative Example 3 were measured. The results are also shown in Table 4.
第４表より、本発明の耐摩耗複合ロールは、比較例３の
合金グレンロールと比べて、約４．５倍の耐摩耗性を有
するのがわかる。また、圧延終了後、実施例３の圧延用
ロールの表面を目視にて観察したところ、顕著な肌あれ
ばなく、熱間薄板圧延用ロールとして十分な耐用性を有
するものであった。Table 4 shows that the wear-resistant composite roll of the present invention has about 4.5 times the wear resistance of the alloy grain roll of Comparative Example 3. Further, after the rolling was completed, the surface of the rolling roll of Example 3 was visually observed, and it was found that there was no noticeable roughness, and it had sufficient durability as a roll for hot thin plate rolling.
本発明の耐摩耗複合ロールは、その外層材が粒状炭化物
及び非粒状炭化物を所定量含有している。In the wear-resistant composite roll of the present invention, the outer layer material contains a predetermined amount of granular carbide and non-granular carbide.
さらに、ＶＣ系の硬質炭化物を含有しているので、耐摩
耗性も良好である。またクラックの発生が抑制され、ク
ラックを起点として表面が結晶単位で脱落摩耗すること
がない。これにより、針肌あれ性が良好な圧延用複合ロ
ールとなっている。Furthermore, since it contains VC-based hard carbide, it has good wear resistance. In addition, the occurrence of cracks is suppressed, and the surface is prevented from being worn away in crystal units starting from cracks. As a result, the composite roll for rolling has good needle roughness.
このため、圧延魁品の形状が良好となり、さらに歩留り
向上等も期待できる。For this reason, the shape of the rolled product is improved, and further improvement in yield can be expected.
また改削までの耐用圧延量が増加するため、ロール組替
の回数を減らすことができ、圧延作業の省力化も可能と
なる。In addition, since the rolling capacity until reshaping increases, the number of roll changes can be reduced, and it is also possible to save labor in rolling work.
第１図（ａ）は本発明の耐摩耗複合ロールの外層材の金
属組織を示す写真であり、
第１図ｂ）はＢ含有量が３００ｐｐｍを超える比較例の
複合ロールの外層材の金属組織を示す写真である。FIG. 1(a) is a photograph showing the metallographic structure of the outer layer material of the wear-resistant composite roll of the present invention, and FIG. 1b) is a photograph showing the metallographic structure of the outer layer material of the composite roll of the comparative example in which the B content exceeds 300 ppm. This is a photo showing.
Claims (6)
物５％以下とを含有する組織からなり、かつ基地の硬さ
がビッカース硬さ（Ｈｖ）５５０以上の外層材と、鋼製
の芯材とからなることを特徴とする耐摩耗複合ロール。(1) An outer layer material consisting of a structure containing 5 to 30% of granular carbide and 5% or less of non-granular carbide in terms of area ratio, and a base hardness of 550 or more Vickers hardness (Hv), and a steel A wear-resistant composite roll characterized by comprising a core material.
記外層の化学成分がＣ１．０〜３．５重量％、Ｓｉ３．
０重量％以下、Ｍｎ１．５重量％以下、Ｃｒ２〜１０重
量％、Ｍｏ９重量％以下、Ｗ２０重量％以下、Ｖ２〜１
５重量％、Ｐ０．０８重量％以下、Ｓ０．０６重量％以
下、残部Ｆｅ及び不純物元素からなることを特徴とする
耐摩耗複合ロール。(2) In the wear-resistant composite roll according to claim 1, the chemical components of the outer layer are C1.0 to 3.5% by weight, Si3.
0 weight % or less, Mn 1.5 weight % or less, Cr 2 to 10 weight %, Mo 9 weight % or less, W 20 weight % or less, V2 to 1
5% by weight of P, 0.08% by weight or less of P, 0.06% by weight or less of S, the balance being Fe and impurity elements.
記外層のＢ含有量が３００ｐｐｍ以下であることを特徴
とする耐摩耗複合ロール。(3) The wear-resistant composite roll according to claim 2, wherein the outer layer has a B content of 300 ppm or less.
ールにおいて、前記外層がＮｉを５．０重量％以下含有
することを特徴とする耐摩耗複合ロール。(4) The wear-resistant composite roll according to any one of claims 1 to 3, wherein the outer layer contains 5.0% by weight or less of Ni.
ールにおいて、前記外層がＣｏを５．０重量％以下含有
することを特徴とする耐摩耗複合ロール。(5) The wear-resistant composite roll according to any one of claims 1 to 4, wherein the outer layer contains 5.0% by weight or less of Co.
ールにおいて、前記外層がＮｂを５．０重量％以下含有
することを特徴とする耐摩耗複合ロール。(6) The wear-resistant composite roll according to any one of claims 1 to 5, wherein the outer layer contains 5.0% by weight or less of Nb.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2049032A JP2960458B2 (en) | 1990-02-28 | 1990-02-28 | Wear resistant composite roll |
| DE4106420A DE4106420C2 (en) | 1990-02-28 | 1991-02-28 | Process for producing a wear-resistant composite roller |
| FR9102409A FR2658838B1 (en) | 1990-02-28 | 1991-02-28 | WEAR RESISTANT COMPOSITE ROLLER. |
| KR1019910003262A KR950006273B1 (en) | 1990-02-28 | 1991-02-28 | Method for wear-resistant compound roll manufacture |
| US07/858,425 US5225007A (en) | 1990-02-28 | 1992-03-24 | Method for wear-resistant compound roll manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2049032A JP2960458B2 (en) | 1990-02-28 | 1990-02-28 | Wear resistant composite roll |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03254304A true JPH03254304A (en) | 1991-11-13 |
| JP2960458B2 JP2960458B2 (en) | 1999-10-06 |
Family
ID=12819751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2049032A Expired - Lifetime JP2960458B2 (en) | 1990-02-28 | 1990-02-28 | Wear resistant composite roll |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2960458B2 (en) |
| KR (1) | KR950006273B1 (en) |
| DE (1) | DE4106420C2 (en) |
| FR (1) | FR2658838B1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07233441A (en) * | 1994-02-21 | 1995-09-05 | Taiheiyo Seiko Kk | High hardness caliber forged roll |
| JP2007061827A (en) * | 2005-08-29 | 2007-03-15 | Hitachi Metals Ltd | External layer material for rolling roll, and rolling roll |
| WO2007077637A1 (en) | 2005-12-28 | 2007-07-12 | Hitachi Metals, Ltd. | Centrifugally cast composite roll |
| US8156651B2 (en) | 2004-09-13 | 2012-04-17 | Hitachi Metals, Ltd. | Centrifugally cast external layer for rolling roll and method for manufacture thereof |
| WO2012176834A1 (en) * | 2011-06-22 | 2012-12-27 | 株式会社リケン | Pressure ring and fabrication method therefor |
| WO2016031519A1 (en) * | 2014-08-25 | 2016-03-03 | 株式会社クボタ | Outer layer material for composite rolls for rolling, and composite roll for rolling |
| JP2017514016A (en) * | 2014-04-14 | 2017-06-01 | ウッデホルムス アーベーＵｄｄｅｈｏｌｍｓ Ａｂ | Cold work tool steel |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2686905B1 (en) * | 1992-02-04 | 1995-03-24 | Chavanne Ketin | COMPOSITE WORKING CYLINDER FOR HOT ROLLING OF FLAT PRODUCTS AND LAMINATION METHOD INCLUDING APPLICATION. |
| CN1301815C (en) * | 2005-06-01 | 2007-02-28 | 东北大学 | Electromagnetic continuous casting method of composite roller and its casting equipment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2399730A (en) * | 1942-05-04 | 1946-05-07 | Int Nickel Co | Method of producing alloyed iron rolls |
| JPS5887249A (en) * | 1981-11-18 | 1983-05-25 | Hitachi Metals Ltd | Wear resistant cast iron for material of roll |
| JPS63114937A (en) * | 1986-11-04 | 1988-05-19 | Kubota Ltd | Composite roll for rolling and its outer layer material |
| WO1988007594A1 (en) * | 1987-03-24 | 1988-10-06 | Hitachi Metals, Ltd. | Abrasion-resistant composite roll and process for its production |
| JPS63266043A (en) * | 1987-04-23 | 1988-11-02 | Nkk Corp | Roll for hot rolling |
| IT1226780B (en) * | 1988-06-10 | 1991-02-07 | Innocenti Santeustacchio Spa | IRON ALLOY USED TO REALIZE THE WORKING LAYER OF LAMINATION CYLINDERS |
| US5225007A (en) * | 1990-02-28 | 1993-07-06 | Hitachi Metals Ltd. | Method for wear-resistant compound roll manufacture |
-
1990
- 1990-02-28 JP JP2049032A patent/JP2960458B2/en not_active Expired - Lifetime
-
1991
- 1991-02-28 DE DE4106420A patent/DE4106420C2/en not_active Expired - Lifetime
- 1991-02-28 FR FR9102409A patent/FR2658838B1/en not_active Expired - Lifetime
- 1991-02-28 KR KR1019910003262A patent/KR950006273B1/en not_active IP Right Cessation
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07233441A (en) * | 1994-02-21 | 1995-09-05 | Taiheiyo Seiko Kk | High hardness caliber forged roll |
| US8156651B2 (en) | 2004-09-13 | 2012-04-17 | Hitachi Metals, Ltd. | Centrifugally cast external layer for rolling roll and method for manufacture thereof |
| JP2007061827A (en) * | 2005-08-29 | 2007-03-15 | Hitachi Metals Ltd | External layer material for rolling roll, and rolling roll |
| WO2007077637A1 (en) | 2005-12-28 | 2007-07-12 | Hitachi Metals, Ltd. | Centrifugally cast composite roll |
| US8308622B2 (en) | 2005-12-28 | 2012-11-13 | Hitachi Metals, Ltd. | Centrifugally cast composit roll |
| WO2012176834A1 (en) * | 2011-06-22 | 2012-12-27 | 株式会社リケン | Pressure ring and fabrication method therefor |
| US9599223B2 (en) | 2011-06-22 | 2017-03-21 | Kabushiki Kaisha Riken | Compression ring and its production method |
| JP2017514016A (en) * | 2014-04-14 | 2017-06-01 | ウッデホルムス アーベーＵｄｄｅｈｏｌｍｓ Ａｂ | Cold work tool steel |
| US10472704B2 (en) | 2014-04-14 | 2019-11-12 | Uddeholms Ab | Cold work tool steel |
| WO2016031519A1 (en) * | 2014-08-25 | 2016-03-03 | 株式会社クボタ | Outer layer material for composite rolls for rolling, and composite roll for rolling |
| KR20170045226A (en) * | 2014-08-25 | 2017-04-26 | 구보다코포레이션 | Outer layer material for composite rolls for rolling, and composite roll for rolling |
| CN106574332A (en) * | 2014-08-25 | 2017-04-19 | 株式会社久保田 | Outer layer material for composite rolls for rolling, and composite roll for rolling |
| CN106574332B (en) * | 2014-08-25 | 2019-08-06 | 株式会社久保田 | The cladding material and rolling composite roll of rolling composite roll |
| US10376937B2 (en) | 2014-08-25 | 2019-08-13 | Kubota Corporation | Outer layer material for composite roll for rolling and composite roll for rolling |
| JP2016043389A (en) * | 2014-08-25 | 2016-04-04 | 株式会社クボタ | Outer layer material of composite roll for rolling, and the composite roll for rolling |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2960458B2 (en) | 1999-10-06 |
| KR910021542A (en) | 1991-12-20 |
| FR2658838B1 (en) | 1994-05-20 |
| DE4106420A1 (en) | 1991-08-29 |
| FR2658838A1 (en) | 1991-08-30 |
| KR950006273B1 (en) | 1995-06-13 |
| DE4106420C2 (en) | 1996-07-11 |
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