JPH0243342A - High-hardness austenitic cast iron - Google Patents
High-hardness austenitic cast ironInfo
- Publication number
- JPH0243342A JPH0243342A JP19481988A JP19481988A JPH0243342A JP H0243342 A JPH0243342 A JP H0243342A JP 19481988 A JP19481988 A JP 19481988A JP 19481988 A JP19481988 A JP 19481988A JP H0243342 A JPH0243342 A JP H0243342A
- Authority
- JP
- Japan
- Prior art keywords
- hardness
- cast iron
- austenitic cast
- resistance
- iron
- 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
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract 3
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 239000000295 fuel oil Substances 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 229910002804 graphite Inorganic materials 0.000 description 10
- 239000010439 graphite Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 6
- 150000001247 metal acetylides Chemical class 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は優れた耐食性と耐摩耗性を兼備えて、耐食性を
必要とする摺動部材、たとえば低質重油使用内燃機関の
シリンダライナ等に好適な高硬度オーステナイト鋳鉄に
関する。Detailed Description of the Invention (Field of Industrial Application) The present invention has both excellent corrosion resistance and wear resistance, and is suitable for sliding members that require corrosion resistance, such as cylinder liners of internal combustion engines that use low-quality heavy oil. Regarding high hardness austenitic cast iron.
（従来の技術およびその問題点）
シリンダライナはピストンリングと摺動しつ＼気密性を
保持しなければならないことから、基本的には耐摩耗性
七面帽焼付性が必要とされる。従って組織中に適当な大
きさのＡ型黒鉛を晶出させて耐焼付性を向上さセると共
に、炭化物を分散させて耐摩耗性を付与した特殊鋳鉄鋳
物が用いられている。しかし使用燃料が３分の多い低質
重油の場合の、ＳＯ□等の発生に伴う腐食に対する格別
の考慮がなされておらず、従って同腐食による潤滑性、
耐摩耗性の低下が問題であった。(Prior Art and its Problems) Since the cylinder liner must maintain airtightness while sliding on the piston ring, it is basically required to have wear resistance and seize resistance. Therefore, special cast iron castings are used in which A-type graphite of an appropriate size is crystallized in the structure to improve seizure resistance, and carbides are dispersed to impart wear resistance. However, no special consideration has been given to corrosion caused by the generation of SO□, etc. when the fuel used is low-quality heavy oil, which has a high fuel oil content of 3%.
The problem was a decrease in wear resistance.
一方耐食性及び耐熱性に優れ、加工性に冨む鋳鉄として
、ニレジストとして知られる高Ｎｉ含有のオーステナイ
ト鋳鉄があり、耐食性、耐熱性の面から上記低質重油用
シリンダライナとしての適性を有しているもの一１耐焼
付性の向上を回ってＡ型黒鉛晶出の鋳物とした場合、そ
の硬度がＨＲＢ８０以下であって、硬度ひいては耐摩耗
性の点からは不適性材料であった。On the other hand, there is a high Ni-containing austenitic cast iron known as Niresist, which has excellent corrosion resistance and heat resistance, and is highly workable.It is suitable as a cylinder liner for the above-mentioned low-quality heavy oil due to its corrosion resistance and heat resistance. In order to improve seizure resistance, a cast product made of A-type graphite crystallization had a hardness of HRB 80 or less, making it an unsuitable material in terms of hardness and wear resistance.
本発明は以上の実情にｔ−ｙ、」＝記高Ｎｉオーステナ
イト鋳鉄の特性を…わずその硬度を向上させ、低質重油
用の内燃機関のシリンダライナ等耐食性を必要とする摺
動部材に好適な材料の提供を目的としてなされたもので
ある。In view of the above circumstances, the present invention improves the properties of Ni austenitic cast iron and improves its hardness, making it suitable for sliding members that require corrosion resistance, such as cylinder liners of internal combustion engines using low-quality heavy oil. This was done for the purpose of providing materials that would be useful.
（問題点を解決するための手段）
従って上述の目的達成のために本発明において採用した
特徴的手段は、重量百分率で、Ｃ：２．９〜３．３％、
Ｓｉ ： １．８〜２．２％Ｍｎ ： ０．８〜１．
２％、 Ｐ ： ０．２５〜１．０％Ｃｒ ： ２．０
〜４．０％、 Ｎｉ ： １２．０〜１６．０％Ｃｕ
： ５．５〜７．５％、 Ｎｂ ： ０．１〜０．３％
Ｖ：Ｑ、１〜０．３％、 Ｂ：０．０１〜０．０４％残
部実質的にＦｅより成るようにした点にある。(Means for solving the problem) Therefore, the characteristic means adopted in the present invention to achieve the above-mentioned object are: C: 2.9 to 3.3% in weight percentage;
Si: 1.8-2.2% Mn: 0.8-1.
2%, P: 0.25-1.0%Cr: 2.0
~4.0%, Ni: 12.0~16.0%Cu
: 5.5-7.5%, Nb: 0.1-0.3%
V: Q, 1 to 0.3%, B: 0.01 to 0.04%, and the balance essentially consists of Fe.
（実施例）
以下に本発明を詳述するが、既述のように本発明は従来
ニレジストとして知られる高Ｎｉオーステナイト鋳鉄の
範晴に入る耐食性合金鋳鉄に、適量のＮｂ、 Ｖ及びＢ
を添加して、自動車エンジン等苛酷条件で使用のシリン
ダライナにも適用可能な硬度、ひいては耐摩耗性をもた
せるようにしたものであり、先ず各成分の限定理由を示
すと次のようである。尚、単位は重量％である。(Example) The present invention will be described in detail below, but as mentioned above, the present invention applies appropriate amounts of Nb, V, and B to a corrosion-resistant alloy cast iron that falls within the range of high Ni austenitic cast iron, conventionally known as Niresist.
is added to give it hardness and wear resistance that can be applied to cylinder liners used under severe conditions such as automobile engines. First, the reasons for limiting each component are as follows. Note that the unit is % by weight.
Ｃ：２．９ 〜３．３ ％
Ｃは炭化物及び黒鉛生成のために必要な成分であり、２
．９％未満ではＡ型黒鉛が晶出し難く、又３．３％を越
した場合、晶出する黒鉛が多くなり、この為硬度低下を
きたす。C: 2.9 to 3.3% C is a necessary component for the production of carbides and graphite, and 2.9% to 3.3%
．． If it is less than 9%, type A graphite is difficult to crystallize, and if it exceeds 3.3%, more graphite will crystallize, resulting in a decrease in hardness.
Ｓｉ ： １．８〜２．２％
Ｓｉは、Ｃと同様１．８％未満では黒鉛の晶出が悪く、
又２．２％を越えた場合硬度低下をきたす。Si: 1.8-2.2% As with C, if Si is less than 1.8%, graphite crystallization is poor;
Moreover, if it exceeds 2.2%, hardness decreases.
Ｍｎ ： ０．８〜１．２％
０．８％未満では硬度が得られず、１．２％を越えた場
合、硬度が高くなり加工困難となる。Mn: 0.8 to 1.2% If it is less than 0.8%, hardness cannot be obtained, and if it exceeds 1.2%, the hardness becomes high and processing becomes difficult.
Ｐ：０．２５〜１．０％
０．２５％未満では硬度を得る為のステダイトの発生が
少なく、又１．０％を越えた場合、逆に過多になり、も
ろくなる。P: 0.25-1.0% If it is less than 0.25%, the generation of steadite to obtain hardness is small, and if it exceeds 1.0%, it becomes too much and becomes brittle.
Ｃｒ ： ２．０〜４．０％
Ｎｉ ： １２．０〜１６．０％
Ｃｕ ： ５．５〜７．５％
通常ニレジスト鋳鉄を得る為に添加するもので、通常使
用されている範囲である。Cr: 2.0 to 4.0% Ni: 12.0 to 16.0% Cu: 5.5 to 7.5% Usually added to obtain Niresist cast iron, and within the commonly used range. .
Ｎｂ：０．１ 〜０．３ ％
Ｎｂは基地硬度を向上させるための添加成分であり、０
．１％未満では上記向上効果が殆んどない。Nb: 0.1 to 0.3% Nb is an additive component to improve base hardness, and
．． If it is less than 1%, the above-mentioned improvement effect is almost absent.
一方０．３％を越えると炭化物の析出が促進される結果
黒鉛量が減少して好ましい耐焼付性が得られないのであ
る。On the other hand, if it exceeds 0.3%, the precipitation of carbides is promoted, resulting in a decrease in the amount of graphite, making it impossible to obtain desirable seizure resistance.
Ｖ：Ｑ、ｌ〜０．３％
■もＮｂと同様基地硬度を向上させる成分であり、０．
１％未満では上記の向上効果は殆んどない。V:Q, l~0.3% (2) is also a component that improves base hardness like Nb, and 0.3%.
If it is less than 1%, the above-mentioned improvement effect will hardly be achieved.
方０．３％を越える含有は炭化物の析出を促し、黒鉛の
晶出を制約して好ましい耐焼付性が得られないのである
。If the content exceeds 0.3%, the precipitation of carbides is promoted, and the crystallization of graphite is restricted, making it impossible to obtain desirable seizure resistance.
なお、上記Ｎｂおよび■の望ましい合計量は０．２〜０
．５％である。Note that the desirable total amount of Nb and ■ is 0.2 to 0.
．． It is 5%.
Ｂ：０．０１〜０．０４％
Ｂは炭化物の析出を促進する成分であるが、０．０１％
未満では添加効果が殆んど見られない。一方０．０４％
を越えると炭化物の生成量が過多となり、高硬度となっ
て加工困難を招来し好ましくない。B: 0.01-0.04% B is a component that promotes precipitation of carbides, but 0.01%
If the amount is less than that, almost no effect will be seen. On the other hand, 0.04%
Exceeding this is not preferable because an excessive amount of carbides will be produced, resulting in high hardness and difficulty in machining.
次に本発明の実施例を従来のニレジスト打倒及び従来シ
リンダライナ材と共に比較して示す。Next, examples of the present invention will be compared with conventional Niresist overturning and conventional cylinder liner materials.
下記第１表は上記各供試材の組成を示し、第２表に同供
試材による硬度、引張強さについて調査した結果を示す
。いずれの供試材においてもＡ型黒鉛を晶出させており
、その例として第１表の本発明実施例１の金属顕微鏡組
織写真（ｘｌＯＯ）を第１図として示す。同図から明ら
かなように好ましいＡ型黒鉛が晶出している。尚、供試
材は金型遠心力鋳造により製作された。Table 1 below shows the composition of each of the above-mentioned test materials, and Table 2 shows the results of investigating the hardness and tensile strength of the test materials. Type A graphite was crystallized in all of the test materials, and as an example, a metallurgical microstructure photograph (xlOO) of Example 1 of the present invention shown in Table 1 is shown in FIG. As is clear from the figure, preferable type A graphite is crystallized. The sample material was manufactured by die centrifugal casting.
第 １ 表 （単位 ｗｔ％、残部実質的にＦｅ） 第 表Table 1 (Unit: wt%, remainder substantially Fe) No. table
第１図は本発明実施例の金属顕微鏡組織写真（ｘ １０
０）である。
特許出願人 久保田鉄工株式会社
代 理 人 弁理士 安 １）敏 雄上表から本
発明の高硬度オーステナイト鋳鉄は、自動車エンジン等
苛酷条件で使用のシリンダライナに必要な耐摩耗性を具
備するに必要な硬度のＨＲＢ８５以上を備えていること
が判る。
（発明の効果）
本発明は以上のとおりであり、特定量のＮｂ、■及びＢ
を含有した特定組成としたので、優れた耐食性と共にシ
リンダライナとして使用可能な硬度ひいては耐摩耗性を
兼ね備えることができたのであり、低質重油使用の内燃
機関のシリンダライナ等耐食性を必要とする摺動部材と
して好適であって、本発明の工業価値は著大である。FIG. 1 is a metallographic microstructure photograph (x 10
0). Patent Applicant Kubota Iron Works Co., Ltd. Representative Patent Attorney Yasu 1) Satoshi From the above table, the high hardness austenitic cast iron of the present invention is necessary to provide the wear resistance required for cylinder liners used under severe conditions such as automobile engines. It can be seen that it has a hardness of HRB85 or higher. (Effects of the Invention) The present invention is as described above, and includes specific amounts of Nb, ■ and B.
By using a specific composition that contains the It is suitable as a member, and the industrial value of the present invention is significant.
Claims (1)
０．８〜１．２％、Ｐ：０．２５〜１．０％Ｃｒ：２．
０〜４．０％、Ｎｉ：１２．０〜１６．０％Ｃｕ：５．
５〜７．５％、Ｎｂ：０．１〜０．３％Ｖ：０．１〜０
．３％、Ｂ：０．０１〜０．０４％残部実質的にＦｅよ
り成ることを特徴とする高硬度オーステナイト鋳鉄。(1) In weight percentage, C: 2.9-3.3%, Si: 1.8-2.2% Mn:
0.8-1.2%, P: 0.25-1.0% Cr: 2.
0-4.0%, Ni: 12.0-16.0% Cu: 5.
5-7.5%, Nb: 0.1-0.3% V: 0.1-0
．． 3%, B: 0.01 to 0.04%, and the balance substantially consists of Fe. High hardness austenitic cast iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19481988A JPH0243342A (en) | 1988-08-03 | 1988-08-03 | High-hardness austenitic cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19481988A JPH0243342A (en) | 1988-08-03 | 1988-08-03 | High-hardness austenitic cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0243342A true JPH0243342A (en) | 1990-02-13 |
Family
ID=16330783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19481988A Pending JPH0243342A (en) | 1988-08-03 | 1988-08-03 | High-hardness austenitic cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0243342A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0412081U (en) * | 1990-05-16 | 1992-01-31 | ||
| WO2009028976A1 (en) * | 2007-08-28 | 2009-03-05 | Alexey Gennadyevich Panov | Resistant to growth cast iron |
| WO2009028736A1 (en) * | 2007-08-31 | 2009-03-05 | Kabushiki Kaisha Toyota Jidoshokki | Austenitic cast iron, process for manufacturing the same, austenitic cast iron castings, and exhaust system parts |
| EP2351865A1 (en) * | 2004-10-27 | 2011-08-03 | Global Tough Alloys Pty Ltd | Improved wear resitant alloy |
-
1988
- 1988-08-03 JP JP19481988A patent/JPH0243342A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0412081U (en) * | 1990-05-16 | 1992-01-31 | ||
| EP2351865A1 (en) * | 2004-10-27 | 2011-08-03 | Global Tough Alloys Pty Ltd | Improved wear resitant alloy |
| WO2009028976A1 (en) * | 2007-08-28 | 2009-03-05 | Alexey Gennadyevich Panov | Resistant to growth cast iron |
| WO2009028736A1 (en) * | 2007-08-31 | 2009-03-05 | Kabushiki Kaisha Toyota Jidoshokki | Austenitic cast iron, process for manufacturing the same, austenitic cast iron castings, and exhaust system parts |
| JP5384352B2 (en) * | 2007-08-31 | 2014-01-08 | 株式会社豊田自動織機 | Austenitic cast iron and its manufacturing method, austenitic cast iron casting and exhaust system parts |
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