JPH07310147A - Ferritic heat resistant cast steel excellent in high temperature corrosion resistance - Google Patents
Ferritic heat resistant cast steel excellent in high temperature corrosion resistanceInfo
- Publication number
- JPH07310147A JPH07310147A JP6121956A JP12195694A JPH07310147A JP H07310147 A JPH07310147 A JP H07310147A JP 6121956 A JP6121956 A JP 6121956A JP 12195694 A JP12195694 A JP 12195694A JP H07310147 A JPH07310147 A JP H07310147A
- Authority
- JP
- Japan
- Prior art keywords
- high temperature
- cast steel
- content
- corrosion resistance
- ferritic heat
- 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
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、高温耐食性のすぐれ
たフェライト系耐熱鋳鋼に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ferritic heat resistant cast steel having excellent high temperature corrosion resistance.
【0002】[0002]
【従来の技術】従来、例えばディーゼルエンジンの副燃
焼室の燃焼ガス出口側に位置する口金部材などの内燃機
関の構造部材の製造に、これが高温の燃焼ガスにさらさ
れることから、高温耐酸化性のすぐれた各種のフェライ
ト系耐熱鋳鋼、例えば特開平5−33105号公報、特
開平5−59498号公報、および特開平5−1713
65号公報に記載されるフェライト系耐熱鋳鋼が用いら
れている。2. Description of the Related Art Conventionally, for manufacturing structural members of an internal combustion engine such as a die member located on the combustion gas outlet side of a secondary combustion chamber of a diesel engine, since it is exposed to high temperature combustion gas, high temperature oxidation resistance Various excellent ferritic heat-resistant cast steels, such as JP-A-5-33105, JP-A-5-59498, and JP-A-5-1713.
The ferritic heat-resistant cast steel described in Japanese Patent No. 65 is used.
【0003】[0003]
【発明が解決しようとする課題】一方、近年の内燃機関
の高性能化および高出力化はめざましく、これに伴な
い、これの構造部材の使用環境は一段と苛酷さを増す状
況にあるが、上記の従来フェライト系耐熱鋳鋼は、すぐ
れた高温耐酸化性をもつものの、高温耐食性が不十分で
あるために、上記の苛酷な使用環境下では腐食の進行が
促進し、満足に対応することができない。On the other hand, in recent years, the performance and output of internal combustion engines have been remarkably high, and along with this, the environment in which the structural members are used is becoming more severe. Although the conventional ferritic heat-resistant cast steel has excellent high-temperature oxidation resistance, its high-temperature corrosion resistance is insufficient, so under the harsh environment of use, the progress of corrosion accelerates and it is not possible to satisfy it satisfactorily. .
【0004】[0004]
【課題を解決するための手段】そこで、本発明者等は、
上述のような観点から、フェライト系耐熱鋳鋼に着目
し、研究を行なった結果、重量%で(以下、%は重量%
を示す)、C:0.1〜0.2%、 Si:0.
1〜2%、Mn:0.1〜2%、 Cr:16
〜20%、Mo:1.1〜2.4%、 Nb:0.
3〜2.5%、Ta:0.01〜2.2%、Cuおよび
/またはAl:0.1〜5%、を含有し、残りがFeと
不可避不純物からなる組成を有するフェライト系耐熱鋳
鋼は、すぐれた高温耐食性を有し、かつ高温耐酸化性お
よび高温強度にもすぐれているという研究結果を得たの
である。Therefore, the present inventors have
From the above viewpoints, as a result of conducting research by paying attention to ferritic heat-resistant cast steel, weight% (hereinafter,% is% by weight)
), C: 0.1 to 0.2%, Si: 0.
1-2%, Mn: 0.1-2%, Cr: 16
.About.20%, Mo: 1.1 to 2.4%, Nb: 0.
Ferritic heat-resistant cast steel having a composition containing 3 to 2.5%, Ta: 0.01 to 2.2%, Cu and / or Al: 0.1 to 5%, and the balance of Fe and inevitable impurities. Obtained the research result that it has excellent high temperature corrosion resistance, and also excellent high temperature oxidation resistance and high temperature strength.
【0005】この発明は、上記の研究結果にもとづいて
なされたものであって、以下にフェライト系耐熱鋳鋼の
成分組成を上記の通りに限定した理由を説明する。 (a) C C成分には、鋳造性を向上させると共に、炭化物を形成
して高温強度を向上させる作用があるが、その含有量が
0.1%未満では前記作用に所望の効果が得られず、一
方その含有量が0.2%を越えると炭化物の形成が過剰
となって靭性が低下するようになることから、その含有
量を0.1〜0.2%と定めた。The present invention was made based on the above research results, and the reasons why the composition of the ferritic heat-resistant cast steel is limited as described above will be explained below. (A) C C component has an effect of improving castability and forming a carbide to improve high temperature strength, but if the content thereof is less than 0.1%, a desired effect can be obtained in the above operation. On the other hand, on the other hand, if the content exceeds 0.2%, the formation of carbides becomes excessive and the toughness decreases, so the content was defined as 0.1 to 0.2%.
【0006】(b) Si Si成分には、溶湯に対して強力な脱酸作用を発揮する
と共に、鋳造性を向上させる作用があるが、その含有量
が0.1%未満では前記作用に所望の効果が得られず、
一方その含有量が2%を越えると高温耐酸化性が低下す
るようになることから、その含有量を0.1〜2%と定
めた。なお、望ましくは0.4〜1.0%の含有がよ
い。(B) Si The Si component exerts a strong deoxidizing action on the molten metal and an action of improving castability, but if the content thereof is less than 0.1%, it is desirable for the above action. The effect of
On the other hand, if the content exceeds 2%, the high temperature oxidation resistance will decrease, so the content was defined as 0.1 to 2%. Incidentally, the content of 0.4 to 1.0% is desirable.
【0007】(c) Mn Mn成分には、Siと同じく脱酸作用を発揮し、かつ鋳
造性を向上させる作用があるが、その含有量が0.1%
未満では前記作用に所望の効果が得られず、一方その含
有量が2%を越えると、高温耐酸化性が低下するように
なることから、その含有量を0.1〜2%と定めた。な
お、望ましくは0.3〜0.9%の含有がよい。(C) Mn The Mn component has the same deoxidizing action as Si and has the action of improving the castability, but its content is 0.1%.
If the content is less than the above, the desired effect cannot be obtained, while if the content exceeds 2%, the high temperature oxidation resistance tends to decrease, so the content is defined as 0.1 to 2%. . Incidentally, the content of 0.3 to 0.9% is desirable.
【0008】(d) Cr Cr成分には、高温耐酸化性を向上させる作用がある
が、その含有量が16%未満では所望のすぐれた高温耐
酸化性を確保することができず、一方その含有量が20
%を越えると急激に脆化するようになることから、その
含有量を16〜20%と定めた。(D) Cr The Cr component has the effect of improving high temperature oxidation resistance, but if its content is less than 16%, the desired excellent high temperature oxidation resistance cannot be ensured. Content is 20
If the content exceeds%, the material will be rapidly embrittled, so the content was defined as 16 to 20%.
【0009】(e) Mo Mo成分には、CuおよびAlとの共存下で、ともに素
地に固溶して高温耐食性を向上させると共に、炭化物を
形成して高温強度を向上させる作用があるが、その含有
量が1.1%未満では前記作用に所望の効果が得られ
ず、一方その含有量が2.4%を越えると靭性が低下す
るようになることから、その含有量を1.1〜2.4%
と定めた。なお、望ましくは1.6〜2.2%の含有が
よい。(E) Mo The Mo component, in the coexistence of Cu and Al, both dissolves in the matrix to improve the high temperature corrosion resistance, and at the same time forms carbides to improve the high temperature strength. If the content is less than 1.1%, the desired effect cannot be obtained, while if the content exceeds 2.4%, the toughness decreases, so the content is set to 1.1. ~ 2.4%
I decided. Incidentally, the content of 1.6 to 2.2% is desirable.
【0010】(f) Nb Nb成分には、素地に固溶すると共に、炭化物を形成し
て高温強度を向上させる作用があるが、その含有量が
0.3%未満では所望の高温強度向上効果が得られず、
一方その含有量が2.5%を越えると靭性が急激に低下
するようになることから、その含有量を0.3〜2.5
%と定めた。なお、望ましくは1.2〜1.9%の含有
がよい。(F) Nb The Nb component has the action of forming a solid solution in the matrix and forming carbides to improve the high temperature strength, but if the content is less than 0.3%, the desired high temperature strength improving effect is obtained. Is not obtained,
On the other hand, if the content exceeds 2.5%, the toughness will suddenly decrease, so the content should be 0.3-2.5.
Defined as%. In addition, desirably, the content of 1.2 to 1.9% is preferable.
【0011】(g) Ta Ta成分には、上記のNbと共に素地に固溶し、かつ炭
化物を形成して高温強度を向上させる作用があるが、そ
の含有量が0.01%未満では所望の高温強度向上効果
が得られず、一方その含有量が2.2%を越えると靭性
が低下するようになることから、その含有量を0.01
〜2.2%と定めた。なお、望ましくは0.2〜1%の
含有がよい。(G) Ta The Ta component has a function of forming a solid solution with the above Nb in the matrix and forming a carbide to improve the high temperature strength, but if the content is less than 0.01%, it is desirable. The effect of improving the high temperature strength cannot be obtained, and on the other hand, if the content exceeds 2.2%, the toughness decreases, so the content is 0.01%.
It was set to 2.2%. Incidentally, the content of 0.2 to 1% is desirable.
【0012】(h) CuおよびAl これらの成分には、素地に固溶して高温耐食性を向上さ
せる作用があるが、その含有量が0.1%未満では高温
耐食性に所望の向上効果が得られず、その含有量が5%
を越えると靭性が急激に低下するようになることから、
その含有量を0.1〜5%と定めた。なお、望ましくは
0.7〜2.5%の含有がよい。(H) Cu and Al These components have the function of forming a solid solution in the matrix to improve the high temperature corrosion resistance, but if the content is less than 0.1%, the desired improvement effect on the high temperature corrosion resistance is obtained. Not contained, its content is 5%
If it exceeds, the toughness will decrease sharply,
Its content was set to 0.1 to 5%. Incidentally, the content of 0.7 to 2.5% is desirable.
【0013】[0013]
【実施例】つぎに、この発明のフェライト系耐熱鋳鋼を
実施例により具体的に説明する。通常の高周波誘導溶解
炉を用い、大気中にてそれぞれ表1〜3に示される成分
組成をもった本発明フェライト系耐熱鋳鋼(以下、単に
本発明鋳鋼という)1〜18および比較フェライト系耐
熱鋳鋼(以下、同様に比較鋳鋼という)1〜8を溶製
し、これをロストワックス精密鋳造鋳型を用い、直径:
14mm×長さ:200mmの寸法をもった棒状鋳物に鋳造
した。EXAMPLES Next, the ferritic heat-resistant cast steel of the present invention will be specifically described by way of examples. Ferrite heat-resistant cast steels of the present invention (hereinafter simply referred to as the cast steels of the present invention) 1 to 18 and comparative ferritic heat-resistant cast steels each having the composition shown in Tables 1 to 3 in the atmosphere using a normal high frequency induction melting furnace (Hereinafter, also referred to as comparative cast steel) 1 to 8 were melted, and this was used in a lost wax precision casting mold to obtain a diameter:
14 mm × length: cast into a rod-shaped casting having dimensions of 200 mm.
【0014】なお、比較鋳鋼1〜8は、いずれも構成成
分のうち高温耐食性、高温耐酸化性、および高温強度に
影響を及ぼす成分含有量(表3に※印を付す)がこの発
明の範囲から低い方に外れた組成をもつものである。In each of the comparative cast steels 1 to 8, the content of the components that affect high temperature corrosion resistance, high temperature oxidation resistance, and high temperature strength among the constituent components (marked with * in Table 3) is within the range of the present invention. It has a composition that deviates from the lower part to.
【0015】ついで、この棒状鋳物から、直径:10mm
×長さ:120mmの寸法をもった試験片を削り出し、こ
の試験片を用い、高温耐食性を評価する目的で、前記試
験片を、1m/sec の速度で流れる温度:870℃の軽
油燃焼ガス雰囲気中に100時間保持する条件で高温腐
食試験を行ない、試験後、前記試験片の表面に付着する
スケールをワイヤーブラシで除去した後の重量減(腐食
減量)を測定した。Then, from this rod-shaped casting, the diameter: 10 mm
× Length: A test piece having a dimension of 120 mm was cut out, and for the purpose of evaluating the high temperature corrosion resistance using the test piece, a temperature of 870 ° C. light oil combustion gas flowing through the test piece at a speed of 1 m / sec. A high temperature corrosion test was carried out under the condition of holding in an atmosphere for 100 hours, and after the test, the weight loss (corrosion weight loss) after removing the scale adhering to the surface of the test piece with a wire brush was measured.
【0016】また、上記棒状鋳物から、直径:10mm×
長さ:20mmの寸法をもった試験片を削り出し、この試
験片を用い、高温耐酸化性を評価する目的で、大気中、
温度:900℃に100時間保持の条件で高温酸化試験
を行ない、試験後、試験片の表面に付着するスケールを
ワイヤーブラシで除去した後の重量減(酸化減量)を測
定した。さらに、上記棒状鋳物から、直径:6mm×平行
部長さ:32mmの寸法をもった試験片を削り出し、この
試験片を用いて、高温強度を評価する目的で、830℃
で引張試験を行ない引張強さを測定した。これらの測定
結果を表4に示した。From the above rod-shaped casting, diameter: 10 mm ×
Length: A test piece having a size of 20 mm was carved out, and this test piece was used to evaluate the high temperature oxidation resistance in the atmosphere,
A high temperature oxidation test was performed under the condition of keeping the temperature at 900 ° C. for 100 hours, and after the test, the weight loss (oxidation weight loss) was measured after the scale adhering to the surface of the test piece was removed with a wire brush. Further, a test piece having a diameter of 6 mm and a parallel portion length of 32 mm was carved out from the rod-shaped casting, and the test piece was used to evaluate high temperature strength at 830 ° C.
A tensile test was conducted to measure the tensile strength. The results of these measurements are shown in Table 4.
【0017】[0017]
【表1】 [Table 1]
【0018】[0018]
【表2】 [Table 2]
【0019】[0019]
【表3】 [Table 3]
【0020】[0020]
【表4】 [Table 4]
【0021】[0021]
【発明の効果】表1〜4に示される結果から、本発明鋳
鋼1〜18は、いずれもすぐれた高温耐食性を有し、か
つ高温耐酸化性および高温強度にもすぐれていることが
明らかであり、一方比較鋳鋼1〜8に見られるように、
構成成分であるC,Cr,Mo,Nb,Ta,Cu、お
よびAlのうちのいずれかの含有量がこの発明の範囲か
ら外れると前記の特性のうちのいずれかの特性が劣った
ものになることが明らかである。上述のように、この発
明のフェライト系耐熱鋳鋼は、すぐれた高温耐食性を有
し、かつすぐれた高温耐酸化性および高温強度を具備す
るので、これらの特性が要求される、例えば内燃機関の
構造部材として用いた場合、苛酷な条件下での実用に際
してもすぐれた性能を長期に亘って発揮するのである。From the results shown in Tables 1 to 4, it is clear that the cast steels 1 to 18 of the present invention all have excellent high temperature corrosion resistance, and also excellent high temperature oxidation resistance and high temperature strength. On the other hand, as seen in Comparative Cast Steels 1-8,
If the content of any one of the constituents C, Cr, Mo, Nb, Ta, Cu, and Al deviates from the scope of the present invention, one of the above characteristics becomes inferior. It is clear. As described above, the ferritic heat-resistant cast steel of the present invention has excellent high-temperature corrosion resistance, and also has excellent high-temperature oxidation resistance and high-temperature strength, so that these properties are required, for example, the structure of an internal combustion engine. When used as a member, it exhibits excellent performance for a long period of time even in practical use under severe conditions.
Claims (1)
%、 Ta:0.01〜2.2%、 Cuおよび/またはAl:0.1〜5%、を含有し、残
りがFeと不可避不純物からなる組成を有することを特
徴とする高温耐食性のすぐれたフェライト系耐熱鋳鋼。1. By weight%, C: 0.1 to 0.2%, Si: 0.1 to 2%, Mn: 0.1 to 2%, Cr: 16 to 20%, Mo: 1.1. ~ 2.4%, Nb: 0.3-2.5
%, Ta: 0.01 to 2.2%, Cu and / or Al: 0.1 to 5%, and the balance of Fe and inevitable impurities. Ferritic heat resistant cast steel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12195694A JP3196502B2 (en) | 1994-05-11 | 1994-05-11 | Ferritic heat-resistant cast steel with excellent high-temperature corrosion resistance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12195694A JP3196502B2 (en) | 1994-05-11 | 1994-05-11 | Ferritic heat-resistant cast steel with excellent high-temperature corrosion resistance |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07310147A true JPH07310147A (en) | 1995-11-28 |
JP3196502B2 JP3196502B2 (en) | 2001-08-06 |
Family
ID=14824075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12195694A Expired - Fee Related JP3196502B2 (en) | 1994-05-11 | 1994-05-11 | Ferritic heat-resistant cast steel with excellent high-temperature corrosion resistance |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3196502B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR970043231A (en) * | 1995-12-18 | 1997-07-26 | 윤종용 | Iron base alloy for mesh belt of blackening furnace with improved high temperature corrosion resistance and manufacturing method thereof |
JP2007254885A (en) * | 2006-02-23 | 2007-10-04 | Daido Steel Co Ltd | Thin cast component and process for producing the same |
JP2008195985A (en) * | 2007-02-09 | 2008-08-28 | Hitachi Metals Ltd | Cast ferritic stainless steel having excellent acid resistance, and cast member |
-
1994
- 1994-05-11 JP JP12195694A patent/JP3196502B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR970043231A (en) * | 1995-12-18 | 1997-07-26 | 윤종용 | Iron base alloy for mesh belt of blackening furnace with improved high temperature corrosion resistance and manufacturing method thereof |
JP2007254885A (en) * | 2006-02-23 | 2007-10-04 | Daido Steel Co Ltd | Thin cast component and process for producing the same |
JP2008195985A (en) * | 2007-02-09 | 2008-08-28 | Hitachi Metals Ltd | Cast ferritic stainless steel having excellent acid resistance, and cast member |
Also Published As
Publication number | Publication date |
---|---|
JP3196502B2 (en) | 2001-08-06 |
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