JPH02232339A - Graphite-containing high chromium cast iron material having excellent wear resistance and resistance to roughening of surface - Google Patents
Graphite-containing high chromium cast iron material having excellent wear resistance and resistance to roughening of surfaceInfo
- Publication number
- JPH02232339A JPH02232339A JP5169789A JP5169789A JPH02232339A JP H02232339 A JPH02232339 A JP H02232339A JP 5169789 A JP5169789 A JP 5169789A JP 5169789 A JP5169789 A JP 5169789A JP H02232339 A JPH02232339 A JP H02232339A
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- resistance
- cast iron
- carbide
- wear resistance
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 43
- 239000010439 graphite Substances 0.000 title claims abstract description 43
- 239000000463 material Substances 0.000 title claims abstract description 36
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 21
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 21
- 239000011651 chromium Substances 0.000 title claims description 28
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 15
- 238000007788 roughening Methods 0.000 title abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 9
- 238000005096 rolling process Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 238000005087 graphitization Methods 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- 238000005979 thermal decomposition reaction Methods 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 239000011162 core material Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 2
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 229910003470 tongbaite Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- 229910001037 White iron Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、主としてロール材として使用される耐摩耗性
および耐肌荒性並びに耐焼付性に優れた高クロム鋳鉄材
に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high chromium cast iron material that is mainly used as a roll material and has excellent wear resistance, roughness resistance, and seizure resistance.
（従来の技術）
高クロム鋳鉄ロール材は、冶金学的には基地組織中に高
硬度のＭ７Ｃ：ｌ型クロム炭化物を含んでおり、耐摩耗
性に優れるのが特徴である。かかる高クロムロール材に
よって圧延使用層たる外層が形成された複合ロールは、
ホットストリップミル用ワークロール等として普及して
いる。(Prior Art) High chromium cast iron roll material contains high hardness M7C:l type chromium carbide in its base structure metallurgically, and is characterized by excellent wear resistance. A composite roll in which the outer layer used for rolling is formed of such high chromium roll material,
Popular as work rolls for hot strip mills, etc.
しかし、高クロム鋳鉄ロール材は、熱伝導率が低《焼付
が生じ易いという問題があった。However, high chromium cast iron roll materials have a problem of low thermal conductivity (ie, they are prone to seizure).
そこで、本出願人は、特公昭６１−１６４１５号および
特公昭６１−１６３３６号において開示した通り、高ク
ロム組織中に黒鉛を晶出させ、耐焼付性を著しく改善し
た黒鉛晶出高クロム鋳鉄材を開発した。Therefore, as disclosed in Japanese Patent Publication Nos. 61-16415 and 61-16336, the present applicant has developed a graphite-crystallized high-chromium cast iron material with significantly improved seizure resistance by crystallizing graphite in a high-chromium structure. developed.
この黒鉛晶出高クロム鋳鉄材を圧延使用層として有する
圧延用ロールによって、従来、焼付が生じ易いとされて
いるステンレス鋼等の特殊鋼を圧延したところ、焼付の
発生も生じず、良好な結果が得られた。When special steel such as stainless steel, which is conventionally thought to be susceptible to seizure, was rolled using a rolling roll having this graphite crystallized high chromium cast iron material as a rolling layer, no seizure occurred and good results were obtained. was gotten.
（発明が解決しようとする課題）
しかしながら、上記黒鉛晶出高クロム鋳鉄材は、晶出黒
鉛の粒径が８０μｍ程度以上と大きく、また黒鉛の間隔
も大きいため、この黒鉛が摩耗や表面損傷の起点となり
、耐摩耗性や耐肌荒性に劣るという問題がある。(Problems to be Solved by the Invention) However, in the graphite-crystallized high-chromium cast iron material, the grain size of the crystallized graphite is large, about 80 μm or more, and the distance between the graphite is large, so this graphite is susceptible to wear and surface damage. There is a problem that it becomes a starting point and has poor abrasion resistance and roughness resistance.
本発明はかかる問題に鑑みなされたもので、耐焼付性を
損うことなく、耐摩耗性および耐肌荒性に優れた高クロ
ノ、鋳鉄材を提供することを目的とする。The present invention was made in view of this problem, and it is an object of the present invention to provide a high chronograph cast iron material that has excellent wear resistance and roughness resistance without impairing seizure resistance.
（課題を解決するための手段）
上記目的を達成するためになされた本発明は、化学ｔｅ
ｌ成が重量％で
Ｃ：２．６〜３．６％、 Ｎｉ：３．０〜５．０％Ｓｉ
： １．０〜２．３％、 Ｃｒ： ５ 〜１０
％Ｍｎ ： ０．５〜１．５％、 Ｍｏ ： ０，４
〜３．０％残部実質的にＦｅからなり、組織中に晶出
した黒鉛と熱処理により析出した微細黒鉛とが共存して
いることを発明の構成とするものである。(Means for Solving the Problem) The present invention, which has been made to achieve the above object, is a chemical te
C: 2.6-3.6%, Ni: 3.0-5.0%Si
: 1.0~2.3%, Cr: 5~10
%Mn: 0.5-1.5%, Mo: 0.4
The composition of the invention is such that the balance of ~3.0% is substantially composed of Fe, and crystallized graphite in the structure coexists with fine graphite precipitated by heat treatment.
（作 用）
本発明の黒鉛を有する高クロム鋳鉄材の化学組成は下記
の理由により限定される。単位は重量％である。(Function) The chemical composition of the high chromium cast iron material containing graphite of the present invention is limited for the following reasons. The unit is weight %.
Ｃ：２．６〜３．６ ％
ＣはＣｒと結合してＣｒ炭化物を形成し、また後述のＳ
ｉ， Ｎｉの黒鉛生成元素により細かい黒鉛となって晶
出する。２．６％未満ではＣｒ炭化物量が減少すると共
に黒鉛の晶出もほとんどなくなる。一方、３．６％を越
えると、本発明の場合Ｃｒ含有量が１０％以下とされて
いるので、過飽和のＣが高濃度のＳｉ，Ｎｉのため多量
に黒鉛化し、晶出黒鉛が過剰となー，て耐摩耗性が劣化
する。C: 2.6-3.6% C combines with Cr to form Cr carbide, and also contains S as described below.
It crystallizes into fine graphite due to the graphite-forming elements of i and Ni. If it is less than 2.6%, the amount of Cr carbides decreases and crystallization of graphite almost disappears. On the other hand, if it exceeds 3.6%, since the Cr content is set to be 10% or less in the case of the present invention, a large amount of supersaturated C will graphitize due to the high concentration of Si and Ni, resulting in excessive crystallized graphite. Well, the wear resistance deteriorates.
Ｓｉ：１．０〜２．３％
Ｓｉは高クロム材質に黒鉛を晶出させるために必要で、
１．０％未満ではこの効果がほとんどなく、２．３％を
越えると黒鉛量が過多となり耐摩耗性を劣化させる．な
おＳｉの添加については、鋳込前ＯＳｉ量を上記限定範
囲より低目にしておき、鋳込時に接種を行い最終製品の
組成で上記範囲に入るように調整する方が黒鉛の晶出に
有効である。Si: 1.0-2.3% Si is necessary to crystallize graphite in high chromium materials.
If it is less than 1.0%, this effect is almost absent, and if it exceeds 2.3%, the amount of graphite becomes excessive and deteriorates the wear resistance. Regarding the addition of Si, it is more effective for graphite crystallization to keep the amount of OSi lower than the above limited range before casting, inoculate during casting, and adjust the composition of the final product so that it falls within the above range. It is.
Ｍｎ ： ０．５〜１．５％
Ｍｒ＋は溶湯の脱酸のためにＳｔと共に積極的に添加す
る。０．５％未満ではこの効果が不足し、１．５％を越
えると機械的性質特に靭性の劣化が著しくなる。Mn: 0.5 to 1.5% Mr+ is actively added together with St to deoxidize the molten metal. If it is less than 0.5%, this effect is insufficient, and if it exceeds 1.5%, the deterioration of mechanical properties, particularly toughness, becomes significant.
Ｎｉ：３．０〜５．０％
Ｎｊは基地組織の改良と黒鉛を晶出させるために積極的
に含有させるもので、３．０％未満では黒鉛の晶出が困
難となる。一方、５．０％を越えるとＳｉの場合と同様
、晶出黒鉛が粗大化しかつ量的にも多すぎる。また、残
留オーステナイトが増加して、耐肌荒性の面で問題とな
る。Ni: 3.0 to 5.0% Nj is actively included to improve the matrix structure and crystallize graphite, and if it is less than 3.0%, crystallization of graphite becomes difficult. On the other hand, if it exceeds 5.0%, as in the case of Si, the crystallized graphite becomes coarse and too large in quantity. In addition, retained austenite increases, which poses a problem in terms of skin roughness resistance.
Ｃｒ：５〜１０％
ＣｒはＣと結合してＣｒ炭化物を形成するが、５％未満
では該炭化物が少なく耐摩耗性の点で劣り、１０％を越
えると上記Ｎｉ， Ｓｉの組成範囲では黒鉛が晶出困難
となる．
Ｍｏ ： ０．４〜３．０％
Ｍｏは焼入焼戻し抵抗を高めると共に、炭化物中に入り
、炭化物硬度を高めると同時に焼戻軟化抵抗を向上させ
るのに有効である。その含有量が０．４％未満ではこの
ような効果が少なく、一方３．０％を越えると白銑化傾
向が強く黒鉛の晶出が困難となる。Cr: 5-10% Cr combines with C to form Cr carbide, but if it is less than 5%, there are few carbides and the wear resistance is inferior, and if it exceeds 10%, it will become graphite in the above Ni and Si composition range. becomes difficult to crystallize. Mo: 0.4 to 3.0% Mo increases the quenching and tempering resistance, enters into the carbide, and is effective in increasing the hardness of the carbide and simultaneously improving the tempering and softening resistance. If the content is less than 0.4%, such effects will be small, while if it exceeds 3.0%, there will be a strong tendency to white iron, making it difficult to crystallize graphite.
本発明の高クロム鋳鉄材は、以上のほか残部実質的にＦ
ｅで形成されるが、ＰおよびＳは共に一般的に材質を脆
くするので少ないほど望ましく、両者とも０．１％以下
に止めるのがよい。また、Ｎｂ，Ｖは鋳造Ｍｉ織の微細
化に効果があり、Ｆｅの一部に代えて各々単独又は複合
して１．０％以下含有することができる。In addition to the above, the high chromium cast iron material of the present invention has the remainder substantially F.
However, since both P and S generally make the material brittle, it is desirable to have a smaller amount, and it is better to keep both of them at 0.1% or less. Further, Nb and V are effective in making the cast Mi weave finer, and can be contained in an amount of 1.0% or less each alone or in combination in place of a part of Fe.
上記高クロム鋳鉄材は、金型鋳造を行うだけで、粒径ｌ
０〜４０μ藩程度の細粒状黒鉛を晶出させることができ
る。かかる細粒黒鉛は摩耗や肌荒れの起点となりにくく
、良好な特性を得ることができるが、晶出量が比較的少
ないため耐焼付性が不足する。そこで、本発明では、耐
摩耗性や耐肌荒性を損うことなく、良好な耐焼付性を確
保するため、クロム炭化物の分解熱処理を施し、基地中
に微細な黒鉛を析出させた。析出黒鉛の粒径は５μｍ程
度以下であり、粒子間隔も１０μｍ程度であって、耐摩
耗性等の特性を劣化させることがなく、耐焼付性のみな
らず耐クラック性の向上をも図ることができる。The above-mentioned high chromium cast iron material can be produced with a grain size of l by simply performing die casting.
Fine granular graphite of about 0 to 40 μm size can be crystallized. Although such fine-grained graphite is less likely to become a starting point for wear and surface roughness and can provide good properties, the amount of crystallization is relatively small, resulting in insufficient seizure resistance. Therefore, in the present invention, in order to ensure good seizure resistance without impairing wear resistance or roughening resistance, chromium carbide is subjected to decomposition heat treatment to precipitate fine graphite in the matrix. The particle size of the precipitated graphite is about 5 μm or less, and the particle spacing is about 10 μm, so it does not deteriorate properties such as wear resistance and can improve not only seizure resistance but also crack resistance. can.
前記分解熱処理は、鋳造後、オーステナイト域温度で数
時間〜数十時間保持することによって行われる。該熱処
理によって鋳造歪も除去される。The decomposition heat treatment is carried out by holding at an austenite region temperature for several hours to several tens of hours after casting. Casting distortion is also removed by the heat treatment.
該熱処理後、適宜の熱処理が引き続き施される。After the heat treatment, an appropriate heat treatment is subsequently performed.
（実施例）
本発明の黒鉛を有する高クロム鋳鉄材は、主として圧延
用複合ロールの使用層である外層材として使用される。(Example) The high chromium cast iron material containing graphite of the present invention is mainly used as an outer layer material of a rolling composite roll.
その内層（軸芯）材としては、高級鋳鉄やダクタイル鋳
鉄等の強靭性のある鋳鉄材又は黒鉛鋳鋼等の鋳鋼材が適
宜使用される。As the inner layer (shaft core) material, a tough cast iron material such as high-grade cast iron or ductile cast iron, or a cast steel material such as graphite cast steel is appropriately used.
また、前記複合ロールの製造方法としては、遠心力鋳造
法により外層を鋳造した後、外層を内有した遠心力鋳造
用鋳型を起立させて静置鋳型を構成し、その内部に内層
材溶湯を注湯し、外層と内層とを溶着一体化する方法が
あり、簡便であるので一般に適用されている。In addition, as a manufacturing method for the composite roll, after casting the outer layer by centrifugal force casting, a centrifugal force casting mold containing the outer layer is stood up to form a stationary mold, and the inner layer material molten metal is placed inside the stationary mold. There is a method of pouring molten metal and welding the outer layer and the inner layer together, and this method is commonly used because it is simple.
尚、外層と内層との溶着に際して、外層から内層へのＣ
ｒの混入を防止するためには、外層と内層との間に中間
層を設けるとよい。中間層を設けることにより、内層の
靭性確保のみならず、外層と内層との溶着部の品質改善
をも図ることができる。In addition, when welding the outer layer and the inner layer, the C from the outer layer to the inner layer
In order to prevent mixing of r, it is preferable to provide an intermediate layer between the outer layer and the inner layer. By providing the intermediate layer, it is possible not only to ensure the toughness of the inner layer, but also to improve the quality of the welded portion between the outer layer and the inner layer.
以上のようにして鋳造された複合ロールは、残留応力の
低減や黒鉛析出のために既述の炭化物分解熱処理を施し
た後、残留オーステナイトを熱的安定相へ変態させるた
めの熱処理が施される。通常、炭化物分解熱処理後、冷
却速度をコントロールして空冷焼入れ又は噴霧水冷焼入
れが施され、その後５００〜６００゜Ｃで保持して歪取
りないし焼戻し熱処理が施され、基地を二次カーバイド
とバーライト、あるいは焼戻しマルテンサイトとバーラ
イトの混合相とする方法が採られる。The composite roll cast as described above is subjected to the aforementioned carbide decomposition heat treatment to reduce residual stress and precipitate graphite, and then heat treated to transform retained austenite into a thermally stable phase. . Usually, after carbide decomposition heat treatment, air-cooling quenching or spray water-cooling quenching is performed by controlling the cooling rate, and then heat treatment is performed to remove distortion or temper by holding at 500 to 600°C, and the base is made of secondary carbide and barlite. Alternatively, a method of forming a mixed phase of tempered martensite and barlite is adopted.
本発明の高クロム材は、ロール材のみならず、圧延付帯
設備におけるローラ材、例えばホッＩ・ランテーブルロ
ーラ等の中空円筒状ローラの外層材としても適用可能な
ことは勿論である。It goes without saying that the high chromium material of the present invention can be used not only as a roll material but also as an outer layer material of a hollow cylindrical roller such as a hot I run table roller, etc., in a rolling equipment.
次に具体的実施例を掲げて説明する。製品胴径φ６８０
閣、胴長１８００ｍｍ，全長４２００閾の複合ロールを
下記のようにして製造した。Next, specific examples will be listed and explained. Product body diameter φ680
A composite roll having a body length of 1800 mm and a total length of 4200 mm was manufactured as follows.
（１）外層として、下記第１表に示す化学組成（重量％
）の高クロム鋳鉄溶湯を用い、これを遠心力鋳造機上で
回転する鋳型に１４１０℃の鋳込温度で肉厚８０ｌｌＩ
Ｉｍ（鋳込重量２ ” ４００ ｋｇ）鋳込んだ．第１
表
（注）残部実質的にＦｅ
（２）鋳込み開始後２３分後に外層は完全に凝固した。(1) As the outer layer, the chemical composition shown in Table 1 below (wt%
) was poured into a mold rotating on a centrifugal casting machine at a casting temperature of 1410°C to a wall thickness of 80llI.
Im (casting weight 2” 400 kg) cast.1st
Table (Note) The remaining portion was substantially Fe (2) The outer layer was completely solidified 23 minutes after the start of casting.
（３）その後鋳型を垂直に立てて上部から軸芯材として
ダクタイル鋳鉄を１３６５゜Ｃで鋳込み、鋳型内を完全
に満たした後、上端を押湯保温材でカバーした。(3) After that, the mold was stood vertically, and ductile cast iron was cast from the top as a shaft core material at 1365°C, and after the inside of the mold was completely filled, the upper end was covered with a riser heat insulating material.
（４）完全に冷却後、ロール素材を鋳型から取出し、炭
化物分解および歪取り熱処理として１０００゜Ｃ×１０
Ｈｒ保持後、５５０゜Ｃまで強制空冷し、５５０゜Ｃ×
１５Ｈｒ保持後、常温まで冷却した。その後、機械加工
を行って製品ロールを得た。(4) After completely cooling, the roll material is taken out from the mold and heat treated at 1000°C x 10 for carbide decomposition and strain relief heat treatment.
After holding for hours, forced air cooling to 550°C, 550°C×
After holding for 15 hours, it was cooled to room temperature. Thereafter, machining was performed to obtain a product roll.
（５）製品ロールの胴部を超音波探傷した結果、外層と
軸芯とは完全に溶着しているのが確認された。また、外
層を光学顕微鏡により組織観察した結果を第１図および
第２図に示す。第１図は熱処理後のもの、第２図は熱処
理前のものであり、倍率は共に５０倍である。第１図よ
り明らかな通り、熱処理により、比較的細かい晶出黒鉛
と５μｍ程度の微細な析出黒鉛とが共存している状態が
観察される。(5) As a result of ultrasonic flaw detection of the body of the product roll, it was confirmed that the outer layer and the shaft core were completely welded. Further, the results of microstructural observation of the outer layer using an optical microscope are shown in FIGS. 1 and 2. FIG. 1 shows the image after heat treatment, and FIG. 2 shows the image before heat treatment, both at a magnification of 50 times. As is clear from FIG. 1, as a result of the heat treatment, a state in which relatively fine crystallized graphite and fine precipitated graphite of about 5 μm coexist is observed.
（発明の効果）
以上説明した通り、本発明の黒鉛を有する高クロム鋳鉄
材によれば、基地組織中に細粒状晶出黒鉛と微細に分散
した析出黒鉛とが共存するので、耐焼付性を損うことな
く、粗粒状黒鉛の存在に起因した耐摩耗性や耐肌荒性の
劣化を有効に防止することができ、更には細粒ないし微
細粒状黒鉛がクランクの進展を効果的に阻止し、耐クラ
ック性ひいては耐折損の向上をも図ることができる。ま
た、本発明材は、Ｃｒ含有量が比較的少ないため、本発
明材と強靭材とを複合化した場合、Ｃｒの混入、拡散に
よる強靭材の靭性劣化が比較的軽微で済むという利点が
ある。(Effects of the Invention) As explained above, according to the high chromium cast iron material containing graphite of the present invention, fine grained crystallized graphite and finely dispersed precipitated graphite coexist in the matrix structure, so that the seizure resistance is improved. It is possible to effectively prevent the deterioration of wear resistance and roughness resistance caused by the presence of coarse graphite without causing any damage, and furthermore, the fine or fine graphite particles effectively prevent the progression of the crank. It is also possible to improve crack resistance and breakage resistance. Furthermore, since the material of the present invention has a relatively low Cr content, when the material of the present invention and a tough material are combined, there is an advantage that the deterioration of toughness of the tough material due to mixing and diffusion of Cr is relatively slight. .
第１図および第２図は実施例に係る黒鉛を有する高クロ
ム鋳鉄材の製造過程における金属組織写真（共に倍率５
０倍）であり、第１図は黒鉛析出熱処理後、第２図は同
熱処理前の＆ｌｌ織を示す。
箪２図Figures 1 and 2 are photographs of metallographic structures in the manufacturing process of high chromium cast iron materials containing graphite according to Examples (both magnification: 5
0 times), and FIG. 1 shows the &ll weave after graphite precipitation heat treatment, and FIG. 2 shows the &ll weave before the same heat treatment. Chest 2
Claims (1)
１．０〜２．３％、Ｃｒ：５〜１０％Ｍｎ：０．５〜１
．５％、Ｍｏ：０．４〜３．０％残部実質的にＦｅから
なり、組織中に晶出した黒鉛と熱処理により析出した微
細黒鉛とが共存していることを特徴とする耐摩耗性およ
び耐肌荒性に優れた黒鉛を有する高クロム鋳鉄材。(1) Chemical composition in weight percent: C: 2.6-3.6%, Ni: 3.0-5.0%, Si:
1.0-2.3%, Cr: 5-10% Mn: 0.5-1
．． 5%, Mo: 0.4 to 3.0%, the balance substantially consists of Fe, and has wear resistance characterized by the coexistence of crystallized graphite in the structure and fine graphite precipitated by heat treatment. A high chromium cast iron material containing graphite with excellent roughness resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1051697A JPH0776407B2 (en) | 1989-03-02 | 1989-03-02 | High chrome cast iron material with graphite having excellent wear resistance and rough surface resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1051697A JPH0776407B2 (en) | 1989-03-02 | 1989-03-02 | High chrome cast iron material with graphite having excellent wear resistance and rough surface resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02232339A true JPH02232339A (en) | 1990-09-14 |
| JPH0776407B2 JPH0776407B2 (en) | 1995-08-16 |
Family
ID=12894092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1051697A Expired - Fee Related JPH0776407B2 (en) | 1989-03-02 | 1989-03-02 | High chrome cast iron material with graphite having excellent wear resistance and rough surface resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0776407B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6116336A (en) * | 1984-06-12 | 1986-01-24 | Fujitsu Ltd | Fortran input/output control processing system |
| JPS6116415A (en) * | 1984-06-30 | 1986-01-24 | 株式会社東芝 | Wiring unit |
| JPH01168842A (en) * | 1987-12-24 | 1989-07-04 | Nippon Steel Corp | Graphite-crystallization-type high-chromium composite roll |
-
1989
- 1989-03-02 JP JP1051697A patent/JPH0776407B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6116336A (en) * | 1984-06-12 | 1986-01-24 | Fujitsu Ltd | Fortran input/output control processing system |
| JPS6116415A (en) * | 1984-06-30 | 1986-01-24 | 株式会社東芝 | Wiring unit |
| JPH01168842A (en) * | 1987-12-24 | 1989-07-04 | Nippon Steel Corp | Graphite-crystallization-type high-chromium composite roll |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0776407B2 (en) | 1995-08-16 |
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