JPS63266038A - Production of composite material of high chrome cast iron and graphite - Google Patents
Production of composite material of high chrome cast iron and graphiteInfo
- Publication number
- JPS63266038A JPS63266038A JP62093731A JP9373187A JPS63266038A JP S63266038 A JPS63266038 A JP S63266038A JP 62093731 A JP62093731 A JP 62093731A JP 9373187 A JP9373187 A JP 9373187A JP S63266038 A JPS63266038 A JP S63266038A
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- graphite
- powders
- powder
- high chromium
- 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.)
- Pending
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 36
- 239000010439 graphite Substances 0.000 title claims abstract description 27
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 27
- 239000002131 composite material Substances 0.000 title claims abstract description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 40
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011812 mixed powder Substances 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 239000011651 chromium Substances 0.000 claims description 44
- 239000000463 material Substances 0.000 abstract description 27
- 239000000843 powder Substances 0.000 abstract description 11
- 238000001513 hot isostatic pressing Methods 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 20
- 239000002245 particle Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 150000001247 metal acetylides Chemical class 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000011162 core material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 102100037904 CD9 antigen Human genes 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 101000738354 Homo sapiens CD9 antigen Proteins 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 229910000859 α-Fe 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)
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は粉末冶金法によって優れた耐摩耗性と耐焼付性
を兼ね備えた高クロム鋳鉄と黒鉛の複合材料の製造方法
に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing a composite material of high chromium cast iron and graphite that has both excellent wear resistance and seizure resistance by a powder metallurgy method.
（従来の技術）
近年、圧延用複合ロールの外層材等に多用される高クロ
ム鋳鉄は、高硬度のＭ？Ｃ３型カーバイドを多量に含有
して耐摩耗性に優れるのが特徴である。しかし含有の高
濃度クロムのために熱伝導率が低く、耐焼付性に劣ると
いう欠点を有して、耐焼付性を必要とする部材への適用
は問題であった。(Prior art) In recent years, high chromium cast iron, which is often used as the outer layer material of composite rolling rolls, has a high hardness of M? It is characterized by containing a large amount of C3 type carbide and having excellent wear resistance. However, due to the high concentration of chromium it contains, it has low thermal conductivity and poor seizure resistance, making it difficult to apply it to members that require seizure resistance.
そこで、本発明者らは上記従来材の欠点を、高クロム材
組成を特定することによってその組織中に黒鉛を晶出せ
しめて改善する技術を開発し、これを特公昭６１−１６
４１５号公報、特公昭６１−１６３３６号公報に開示し
たのであり、黒鉛晶出の高クロム鋳鉄の組成概要を示す
と次の通りである。Therefore, the present inventors developed a technique to improve the above-mentioned drawbacks of the conventional materials by crystallizing graphite in the structure by specifying the composition of the high-chromium material.
It was disclosed in Japanese Patent Publication No. 415 and Japanese Patent Publication No. 61-16336, and the outline of the composition of high chromium cast iron with graphite crystallization is as follows.
Ｃ： ２．４〜３．４％、Ｓｔ ： ２．０〜３．４％
、Ｍｎ ： ０．５〜１．５％、Ｎｉ ： ４．５〜１
０％、Ｃｒ： ５〜１０％、ＭＯ二０．４〜１．５％、
残部実質的にＦｅゆ（発明が解決しようとする問題点）
上記発明の黒鉛を晶出せしめた高クロム鋳鉄は、Ｃｒが
強力な白銑化作用を有する成分であることから、黒鉛晶
出のためにはその量を抑制せざるを得ず、５〜１０％と
、前記従来の高クロム鋳鉄より低い含有量であり、従っ
て共晶カーバイド量の減少と共に耐摩耗性も低下する。C: 2.4-3.4%, St: 2.0-3.4%
, Mn: 0.5-1.5%, Ni: 4.5-1
0%, Cr: 5-10%, MO2 0.4-1.5%,
The remainder is substantially Fe (problem to be solved by the invention) The high chromium cast iron in which graphite is crystallized according to the above invention is free from graphite crystallization because Cr is a component that has a strong whitening effect. In order to achieve this, the amount must be suppressed, and the content is 5 to 10%, which is lower than that of the conventional high chromium cast iron, and therefore, as the amount of eutectic carbide decreases, the wear resistance also decreases.
つまり高クロム鋳鉄の特徴である優れた耐摩耗性を最大
限に利用できず、それに黒鉛の晶出量及びサイズの制御
が困難であるなど、なお問題点を残していた。In other words, the excellent wear resistance characteristic of high chromium cast iron could not be utilized to the fullest, and problems still remained, such as difficulty in controlling the amount and size of graphite crystallization.
本発明は叙上の問題点に鑑みなされたものであり、従来
材並みの高濃度Ｃｒを含有して優れた耐摩耗性を有する
高クロム鋳鉄材質に、更に黒鉛を介在させて耐焼付性に
も優れるようにした材料の提供を目的とする。The present invention was made in view of the above-mentioned problems, and is made of a high chromium cast iron material that contains a high concentration of Cr and has excellent wear resistance as conventional materials, and further interposes graphite to improve seizure resistance. The purpose is to provide materials that have excellent properties.
（問題点を解決するための手段）
本発明における上記目的達成のための特徴的手段は、
重量百分率で、
Ｃ：２，０〜３．２％、 Ｓｉ：０．５〜３．０％、Ｍ
ｎ ： ０．５〜１．５％、 Ｐ ： ０．０８％以下
、Ｓ ： ０．０６％以下、 Ｎｉ ： １．０〜７
．０％、Ｃｒ：１０〜２５％、 Ｍｏ ： ０．５
〜３．０％、残部実質的にＦｅから成る高クロム鋳鉄粉
末中に、・重量百分率で０．２〜５％の黒鉛粉末を均一
に分散含有させた混合粉末を成形して後、熱間静水圧加
圧処理するようにした点にある。(Means for Solving the Problems) Characteristic means for achieving the above object in the present invention are as follows: C: 2.0 to 3.2%, Si: 0.5 to 3.0%, in weight percentages. M
n: 0.5-1.5%, P: 0.08% or less, S: 0.06% or less, Ni: 1.0-7
．． 0%, Cr: 10-25%, Mo: 0.5
~3.0%, the balance being essentially Fe, mixed powder containing graphite powder of 0.2 to 5% by weight is uniformly dispersed in the powder, and then heated. The key point is that hydrostatic pressure treatment is applied.
（実施例〉 先ず高クロム鋳鉄粉末の成分限定理由から述べる。(Example> First, we will discuss the reasons for limiting the components of high chromium cast iron powder.
Ｃ：２．０〜３．２％
Ｃは（Ｆｅ＋ Ｃｒ） −ｒ Ｃ３型炭化物を安定にす
る範囲で、Ｃｒとのバランスをとりつ＼、目的の炭化物
量により決定されるもので、本発明におけるＣｒｉでは
、Ｃの２．０％未満は前記炭化物量が少なく、耐摩耗性
が不足し、一方３．２％を越えると該炭化物が過剰とな
って機械的性質の低下、特に靭性の劣化が著しくなる。C: 2.0 to 3.2% C is determined by the desired amount of carbide while maintaining a balance with Cr within a range that stabilizes the (Fe+Cr)-r C3 type carbide. In terms of Cri, if the C content is less than 2.0%, the amount of carbides is small and the wear resistance is insufficient, while if it exceeds 3.2%, the carbides are excessive and the mechanical properties deteriorate, especially the toughness. becomes significant.
Ｓｉ：０．５〜３．０％
Ｓｉは脱酸作用を有し、溶湯の脱酸のためには０．５％
未満ではその効果はない。Si: 0.5-3.0% Si has a deoxidizing effect, and 0.5% is required for deoxidizing molten metal.
If it is less than that, there is no effect.
Ｓｔはまた黒鉛化促進元素であり、黒鉛粉末と高クロム
鋳鉄粉末の混合物成形体の熱間静水圧加圧（ＨＩ Ｐ）
処理時に、黒鉛のＣ原子が高クロム鋳鉄粉末中に拡散し
て脆化するのを防ぐのに有効である。が、同効果も０．
５％未満では見るべきものがなく、一方３．０％を越え
ると上記効果は飽和する。St is also an element that promotes graphitization, and is used in hot isostatic pressing (HI P) of a mixture compact of graphite powder and high chromium cast iron powder.
It is effective in preventing carbon atoms of graphite from diffusing into high chromium cast iron powder and causing embrittlement during processing. However, the same effect is also 0.
If it is less than 5%, there is nothing to be seen, while if it exceeds 3.0%, the above effect is saturated.
Ｍｎ ： ０．５〜１．５％
ＭｎはＳｉの脱酸作用を補助するものとして積極的に添
加されるが、０．５％未満の含有では脱酸は不十分であ
る。一方１．５％を越えて含有されると機械的性質、特
に靭性の点で劣化が著しくなる。Mn: 0.5-1.5% Mn is actively added to assist the deoxidizing effect of Si, but if the content is less than 0.5%, deoxidizing is insufficient. On the other hand, if the content exceeds 1.5%, mechanical properties, especially toughness, will deteriorate significantly.
Ｐ：０．０８％以下
Ｐは材質を脆（する元素であり、少ない程望ましいが、
不可避的にある程度は含有されるものであり、減量手段
の経済性を考慮して０．０８％以下と限定する。P: 0.08% or less P is an element that makes the material brittle, so the less the better,
It is unavoidably contained to some extent, and is limited to 0.08% or less in consideration of the economic efficiency of the weight reduction means.
Ｓ：０．０６％以下
ＳはＰと同様に材質を脆くするもので、少ない程望まし
いがやはり不可避的にある程度は含有され、減量手段の
経済性を考慮して０．０６％以下と限定した。S: 0.06% or less S, like P, makes the material brittle, and although it is desirable to have less S, it is still unavoidably contained to some extent, so it was limited to 0.06% or less in consideration of the economic efficiency of the weight reduction method. .
Ｎｉ ： １．０〜７．０％
Ｎｉは焼入性の向上、黒鉛の安定化及び積極的に硬度を
調整するために含有させるが、１．０％未満では上記効
果に見るべきものがなく、一方７．０％を越えると残留
オーステナイトが多くなり必要とする硬度が得がたい。Ni: 1.0 to 7.0% Ni is included to improve hardenability, stabilize graphite, and actively adjust hardness, but if it is less than 1.0%, the above effects will not be noticeable. On the other hand, if it exceeds 7.0%, retained austenite increases and it is difficult to obtain the required hardness.
望ましくは１．０〜４．０％である。It is preferably 1.0 to 4.0%.
Ｃｒ ： １０〜２５％
ＣｒはＣと結合して、（Ｆｅ、 Ｃｒ） ？ Ｃ３型の
高硬度炭化物を晶出させるのに必要であり、その量はＣ
量とのバランスと、必要な炭化物量により決定されるが
、本発明のＣ量に対しては、Ｃｒが１０％未満の場合Ｍ
３Ｃ型炭化物が多く晶出し耐摩耗性が劣化する。一方２
５％を越えて含有されるとＭ ２３ Ｃ６型の炭化物が
増加するが、同炭化物はＭＩ Ｃ３型炭化物に比し低硬
度であり、これまた耐摩耗性の劣化をもたらすのである
。Cr: 10-25% Cr combines with C to form (Fe, Cr)? It is necessary to crystallize C3 type high hardness carbide, and the amount is C3.
It is determined by the balance with the amount and the required amount of carbide, but for the amount of C in the present invention, if Cr is less than 10%, M
Many 3C type carbides crystallize and wear resistance deteriorates. On the other hand 2
If the content exceeds 5%, the M 23 C6 type carbide increases, but this carbide has a lower hardness than the MIC3 type carbide, which also causes deterioration of wear resistance.
Ｍｏ ： ０．５〜３．０％
Ｍｏは焼入焼戻し抵抗性を高めると共に炭化物中に入り
、炭化物の硬度を高めるのに有効であり、その含有量が
０．５％未満では同効果が少ない。Mo: 0.5 to 3.0% Mo increases the resistance to quenching and tempering, and also enters into the carbide and is effective in increasing the hardness of the carbide. If its content is less than 0.5%, the same effect is small. .
またＭｏは白銑化元素であるため３．０％を越えて含有
されると、黒鉛粉末を混合した原料粉末のＨＩＰ処理時
に黒鉛が不安定、つまり化合物化の傾向を強めるのであ
る。Furthermore, since Mo is a white ironing element, if it is contained in an amount exceeding 3.0%, graphite becomes unstable during HIP treatment of raw material powder mixed with graphite powder, that is, the tendency to become compounds increases.
次に混合の黒鉛粉末量を０．２〜５％とした理由を述べ
る。Next, the reason why the amount of graphite powder in the mixture was set to 0.2 to 5% will be described.
既述のように黒鉛粉末は高クロム鋳鉄の組織中に介在さ
せ、その潤滑作用によって同材質の耐焼付性を向上させ
るように混合するものであるが、その向上効果は０．２
％未満では期待できず、一方５％を越えると、混合時に
おける均一分散が困難となり、ＨＩＰ処理後の製品の強
度は著しく低下する。このため０．２〜５％と限定して
いるのであり、望ましくは０．２〜２．５％である。As mentioned above, graphite powder is interposed in the structure of high chromium cast iron and mixed so as to improve the seizure resistance of the same material by its lubricating effect, but the improvement effect is 0.2
If it is less than 5%, it cannot be expected; on the other hand, if it exceeds 5%, uniform dispersion during mixing becomes difficult, and the strength of the product after HIP treatment is significantly reduced. For this reason, it is limited to 0.2 to 5%, preferably 0.2 to 2.5%.
次に各粉末の粒度について述べると、望ましい平均粒径
は高クロム鋳鉄粉末で１０〜２００μｍ、黒鉛粉末では
２０〜３００μｍである。Next, regarding the particle size of each powder, the desirable average particle size is 10 to 200 μm for high chromium cast iron powder, and 20 to 300 μm for graphite powder.
これは平均粒径１０μｍ未満の高クロム鋳鉄粉末は酸化
されやすく、保管、取扱いに不便であり、一方２００μ
ｍを越えると均一混合が困難となるた・ めである。This is because high chromium cast iron powder with an average particle size of less than 10 μm is easily oxidized and is inconvenient to store and handle;
This is because if it exceeds m, it becomes difficult to mix uniformly.
黒鉛粉末について言えば、ＨＩＰ処理後の材質中の黒鉛
粒子径は、混合粉末中の粒子より縮小されるものであり
、組織中粒子が細粒に過ぎると潤滑作用ひいては耐焼付
性の向上が期待できず、この意味で黒鉛粉末粒子は平均
径で少なくとも２０μｍは欲しいのであり、より好まし
くは４０μｍ以上である。一方３００μｍを越えると均
一混合が困難になるのである。Regarding graphite powder, the diameter of the graphite particles in the material after HIP treatment is smaller than that in the mixed powder, and if the particles in the structure are too fine, it is expected that the lubricating effect and seizing resistance will improve. In this sense, the graphite powder particles are desired to have an average diameter of at least 20 μm, more preferably 40 μm or more. On the other hand, if the thickness exceeds 300 μm, uniform mixing becomes difficult.
なお、上記特定組成の高クロム鋳鉄粉末は通常の粉末冶
金手法によって製造できるものであることを付記してお
く。It should be noted that the high chromium cast iron powder having the above-mentioned specific composition can be manufactured by ordinary powder metallurgy techniques.
ところで、黒鉛粉末、フェロシリコン粉末、鉄粉末等の
混合粉末を焼結して「鋳鉄組織を有する材料の製造方法
」が特公昭６１−４００２８号公報に開示されているが
、同方法は、通常の溶製による小物の鋳鉄品が白銑化し
やすいのに比し、白銑化しない小容量鋳鉄品を製造する
方法であり、熱間静水圧加圧を行わない点においても本
発明とは異なるのである。By the way, ``a method for manufacturing a material having a cast iron structure'' by sintering a mixed powder of graphite powder, ferrosilicon powder, iron powder, etc. is disclosed in Japanese Patent Publication No. 61-40028. Compared to small cast iron products produced by melting, which easily turn into white pig iron, this method produces small-capacity cast iron products that do not turn into white pig iron, and is also different from the present invention in that hot isostatic pressing is not performed. It is.
下記第１表に、本発明実施例に用いた高クロム １鋳
鉄粉末の組成（表中のＡ）、比較例として従来の黒鉛を
晶出していない高クロム鋳鉄例の組成（同Ｂ）、及び黒
鉛を晶出した高クロム鋳鉄例の組成（同Ｃ）を示す。Table 1 below shows the composition of the high chromium 1 cast iron powder used in the examples of the present invention (A in the table), the composition of a conventional high chromium cast iron example in which graphite is not crystallized as a comparative example (B), and The composition (C) of an example of high chromium cast iron in which graphite has been crystallized is shown.
第１表
実施例１
上記Ａ組成の高クロム鋳鉄粉末の平均粒径８４μｍのも
のに、重量百分率で１．１％を含むように平均粒径７０
μｍの黒鉛粉末を添加し均一に混合して後、厚板状に成
形し、＾ｒガス雰囲気中で１１００℃、１０００ｋｇ
ｆ ／ ｃＩｌｌ、２時間の条件でＨＩＰ処理を行ない
、１００ Ｘ １００ Ｘ ５０ｆｌの厚板状材を得た
。同村の顕微鏡金属組織には、平均粒径３０μＩの黒鉛
が均一に分布しているのが認められた。Table 1 Example 1 The average particle size of the high chromium cast iron powder having composition A is 84 μm, and the average particle size is 70 μm so that the powder contains 1.1% by weight.
After adding μm graphite powder and mixing it uniformly, it was formed into a thick plate, and was heated to 1000 kg at 1100℃ in a gas atmosphere.
HIP treatment was performed under the conditions of f/cIll and 2 hours to obtain a plate-like material of 100 x 100 x 50 fl. In the microscopic metal structure of the same village, it was observed that graphite with an average particle size of 30 μI was uniformly distributed.
第１図は上記実施例の顕微鏡金属組織写真である。FIG. 1 is a microscopic metal structure photograph of the above example.
次に上記実施例材（Ａ組成）と、比較例として掲げた黒
鉛の晶出していない高クロム鋳鉄材（Ｂ組成）及び黒鉛
晶出高クロム鋳鉄材（Ｃ組成）について、ファビリー試
験及び摩耗試験を行った結果を示す。Next, Fabry tests and wear tests were performed on the above-mentioned example materials (composition A), high chromium cast iron materials with no graphite crystallization (composition B), and high chromium cast iron materials with graphite crystallization (composition C) as comparative examples. The results are shown below.
ｉ ファビリー試験は、１０φ×３５１の試験片を５Ｕ
Ｓ４３４製の一対の■ブロックで挟みつけ、３０ｋｇｆ
の荷重で押しつけながら該試験片を回転させ、回転に要
したトルクにより焼付きの有無、程度を調査するもので
ある。i In the fabili test, a 10φ x 351 test piece was used for 5U
Sandwiched between a pair of S434 blocks, 30kgf
The test piece is rotated while being pressed with a load of 1, and the presence and extent of seizure is investigated based on the torque required for rotation.
ａ）従来高クロム鋳鉄材（Ｂ組成）（黒鉛品出なし）
２１秒後にトルクの大巾な上昇が認められ、焼付が発生
した。a) Conventional high chromium cast iron material (composition B) (no graphite product) A large increase in torque was observed after 21 seconds, and seizure occurred.
ｂ）本発明実施例材（Ａｍ成）及び黒鉛晶出高クロム鋳
鉄材（Ｃ組成）。b) Example material of the present invention (Am composition) and graphite crystallized high chromium cast iron material (C composition).
いずれも、２分間の試験においてトルクの大きな変動は
認められず、焼付は発生しなかった。In either case, no large fluctuations in torque were observed during the 2-minute test, and no seizure occurred.
ｉｉ 摩耗試験は大戦式摩耗試験機によった。試験片
と摩擦する相手材として３４５Ｃ材を用い、荷重は１０
ｋｇｆで、摩耗減量を調査し、本発明実施例材（へ組成
）を基準１とし他を比較評価した。ii The abrasion test was performed using a Great War type abrasion tester. 345C material was used as the mating material that rubs against the test piece, and the load was 10
kgf, the abrasion loss was investigated, and the example materials of the present invention (composition) were used as standard 1, and the others were compared and evaluated.
ａ）本発明実施例材（Ａ組成）−・−・・−・・−１，
０ｂ）従来高クロム鋳鉄材（Ｂ組成） −０，９７０）
黒鉛晶出高クロム鋳鉄材（Ｃ組成）・−４、２７次に、
本発明による高クロム鋳鉄と黒鉛の複合材料をロール外
層に適用した実施例を示す。a) Example material of the present invention (composition A)--1,
0b) Conventional high chromium cast iron material (B composition) -0,970)
Graphite crystallized high chromium cast iron material (C composition) -4, 27 Next,
An example will be shown in which a composite material of high chromium cast iron and graphite according to the present invention is applied to the outer layer of a roll.
下記第２表に掲げる組成の高クロム鋳鉄粉末（平均粒径
８５μｍ）と、重量百分率で１．５％の黒鉛粉末（平均
粒径８０μｍ）の均一混合物により、片肉５（ｈａの円
筒状成形体を、フェライト基地から成る低炭素低合金鋼
のロール芯（φ２００ ｘ ｉ ７００）の外周に嵌設
成形して素ロールとし、該素ロールをＡｒガス中で、１
１００℃、２０００ｋｇｆ／ｃｎ！、 ’１時間の処理
条件でＨＩＰ処理を行って、φ２７６ Ｘ Ａ７００（
ｍｓ ）の複合ロールを得た。尚、ＨＩＰ処理は、Ａｒ
ガス等の不活性雰囲気中に限らず、Ｎ２ガス等の還元性
雰囲気中で行ってもよい。A homogeneous mixture of high chromium cast iron powder (average particle size 85 μm) having the composition listed in Table 2 below and graphite powder (average particle size 80 μm) with a weight percentage of 1.5% was used to form a cylindrical shape with a thickness of 5 ha. The body was fitted onto the outer periphery of a roll core (φ200 x i 700) made of low-carbon, low-alloy steel made of a ferrite base to form a raw roll, and the raw roll was heated for 1 hour in Ar gas.
100℃, 2000kgf/cn! , ' Perform HIP processing under 1 hour processing conditions to obtain φ276 x A700 (
ms) composite rolls were obtained. In addition, HIP processing is performed using Ar
The process is not limited to an inert atmosphere such as gas, but may be performed in a reducing atmosphere such as N2 gas.
該複合ロール外層の顕微鏡金属組織には、平均粒径４０
μ−の黒鉛の均一分布が認められた。The microscopic metal structure of the outer layer of the composite roll has an average grain size of 40
A uniform distribution of μ- graphite was observed.
第２図は上記顕微鏡金属組織である。FIG. 2 shows the above-mentioned microscopic metal structure.
次いで上記複合ロールに歪取り熱処理（６００℃Ｘ ２
０Ｈｒ）及び機械加工を施して後、超音波探傷を行った
結果、外層とロール芯との接合は良好であった。また外
層の硬度はＨ５８２であった。Next, the composite roll was subjected to strain relief heat treatment (600°C x 2
After 0 hours) and machining, ultrasonic flaw detection was performed, and as a result, the bond between the outer layer and the roll core was good. The hardness of the outer layer was H582.
なお上述のようにして得られるロールは、ホットストリ
ップミル仕上スタンド前段並びに後段用ワークロール、
同粗スタンド用ワークロール、条鋼圧延ロール等として
好適であり、ロール芯材に安価な鋼材の使用が可能な点
で有利なロールである。The rolls obtained as described above can be used as work rolls for the front and rear stages of the hot strip mill finishing stand.
This roll is suitable as a work roll for rough stands, a long steel rolling roll, etc., and is advantageous in that inexpensive steel can be used for the roll core material.
（発明の効果）
本発明は以上のとおりであり、Ｃｒ１０〜２５％を含む
高クロム鋳鉄粉末と黒鉛粉末の混合粉末を成形し、熱間
静水圧加圧処理によるようにしたので、組織中の黒鉛量
及び大きさのコントロールが可能となり、鋳造による黒
鉛晶出高クロム鋳鉄の如きＣｒｌの抑制を必要とせず、
多くの高硬度炭化物を保有させて上記試験結果から明ら
かなように、優れた耐焼付性及び耐摩耗性を兼備した材
料とすることができ、これらの特性を必要とする機械部
品、ロール及びローラの外層材等として優れた性能を発
揮するもので、本発明の工業的価値は著大である。(Effects of the Invention) The present invention is as described above, and a mixed powder of high chromium cast iron powder and graphite powder containing 10 to 25% Cr is molded and subjected to hot isostatic pressure treatment, so that It is possible to control the amount and size of graphite, and there is no need to suppress Crl as in high chromium cast iron with graphite crystallization by casting.
As is clear from the above test results, it is possible to create a material that possesses many high-hardness carbides and has both excellent seizure resistance and wear resistance, and is suitable for mechanical parts, rolls, and rollers that require these properties. The present invention exhibits excellent performance as an outer layer material, etc., and the industrial value of the present invention is enormous.
第１図及び第２図は本発明実施例の顕微鏡金属組織写真
（Ｘ ４００）である。FIGS. 1 and 2 are microscopic metallographic photographs (X 400) of examples of the present invention.
Claims (1)
：０．５〜１．５％、Ｐ：０．０８％以下、Ｓ：０．０
６％以下、Ｎｉ：１．０〜７．０％、Ｃｒ：１０〜２５
％、Ｍｏ：０．５〜３．０％、残部実質的にＦｅから成
る高クロム鋳鉄粉末中に、重量百分率で０．２〜５％の
黒鉛粉末を均一に分散含有させた混合粉末を成形して後
、熱間静水圧加圧処理することを特徴とする高クロム鋳
鉄と黒鉛の複合材料製造方法。(1) Weight percentage: C: 2.0-3.2%, Si: 0.5-3.0%, Mn
: 0.5-1.5%, P: 0.08% or less, S: 0.0
6% or less, Ni: 1.0-7.0%, Cr: 10-25
%, Mo: 0.5 to 3.0%, and the balance is formed into a mixed powder in which graphite powder of 0.2 to 5% by weight is uniformly dispersed in high chromium cast iron powder consisting essentially of Fe. A method for producing a composite material of high chromium cast iron and graphite, which is characterized by subjecting it to hot isostatic pressure treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62093731A JPS63266038A (en) | 1986-12-11 | 1987-04-15 | Production of composite material of high chrome cast iron and graphite |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61-295287 | 1986-12-11 | ||
| JP29528786 | 1986-12-11 | ||
| JP62093731A JPS63266038A (en) | 1986-12-11 | 1987-04-15 | Production of composite material of high chrome cast iron and graphite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63266038A true JPS63266038A (en) | 1988-11-02 |
Family
ID=26435025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62093731A Pending JPS63266038A (en) | 1986-12-11 | 1987-04-15 | Production of composite material of high chrome cast iron and graphite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63266038A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5290507A (en) * | 1991-02-19 | 1994-03-01 | Runkle Joseph C | Method for making tool steel with high thermal fatigue resistance |
| KR100450395B1 (en) * | 2000-08-24 | 2004-09-30 | 주식회사 포스코 | A guide liner with wear and sticking resistance |
| JP2022046530A (en) * | 2016-10-17 | 2022-03-23 | テネコ・インコーポレイテッド | Free graphite-containing powder |
-
1987
- 1987-04-15 JP JP62093731A patent/JPS63266038A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5290507A (en) * | 1991-02-19 | 1994-03-01 | Runkle Joseph C | Method for making tool steel with high thermal fatigue resistance |
| KR100450395B1 (en) * | 2000-08-24 | 2004-09-30 | 주식회사 포스코 | A guide liner with wear and sticking resistance |
| JP2022046530A (en) * | 2016-10-17 | 2022-03-23 | テネコ・インコーポレイテッド | Free graphite-containing powder |
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