JPH07278759A - Austenitic heat resistant cast steel, excellent in strength at high temperature and machinability, and exhaust system parts made thereof - Google Patents
Austenitic heat resistant cast steel, excellent in strength at high temperature and machinability, and exhaust system parts made thereofInfo
- Publication number
- JPH07278759A JPH07278759A JP7580294A JP7580294A JPH07278759A JP H07278759 A JPH07278759 A JP H07278759A JP 7580294 A JP7580294 A JP 7580294A JP 7580294 A JP7580294 A JP 7580294A JP H07278759 A JPH07278759 A JP H07278759A
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- Prior art keywords
- cast steel
- resistant cast
- high temperature
- machinability
- exhaust system
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車エンジンの排気
系部品等に適する耐熱鋳鋼に関し、特に９００℃以上の
高温度での強度、および被削性の優れたオーステナイト
系耐熱鋳鋼およびそれからなる排気系部品に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant cast steel suitable for an exhaust system component of an automobile engine, etc., and in particular, an austenitic heat-resistant cast steel excellent in strength at a high temperature of 900 ° C. or higher and machinability, and an exhaust gas made of the same. Related to system parts.
【０００２】[0002]
【従来の技術】従来の耐熱鋳鉄、耐熱鋳鋼としては、例
えば表１に従来材として示すような組成のものがある。
自動車のエキゾーストマニホールドやタービンハウジン
グ等の排気系部品等においては、使用条件が高温過酷と
なることから、表１に示すようなＮｉ−Ｃｒ系耐熱性オ
ーステナイト鋳鉄（ニレジスト鋳鉄など）や、フェライ
ト系耐熱鋳鋼などが採用されていた。2. Description of the Related Art Conventional heat-resistant cast iron and heat-resistant cast steel have, for example, compositions shown in Table 1 as conventional materials.
For exhaust system parts such as automobile exhaust manifolds and turbine housings, the operating conditions become severe at high temperatures. Therefore, as shown in Table 1, Ni-Cr heat resistant austenitic cast iron (Niresist cast iron, etc.) and ferrite heat resistant materials are used. Cast steel was used.
【０００３】オーステナイト系耐熱鋳鋼として、特開昭
６１ー８７８５２号公報には、Ｃ，Ｓｉ，Ｍｎ，Ｎ，Ｎ
ｉ，Ｃｒ，Ｖ，Ｎｂ，Ｔｉ，Ｂ，ＷおよびＦｅからなる
組成を特定し、クリープ強度と耐力を向上する開示があ
る。また、特開昭６１ー１７７３５２号公報には、Ｃ，
Ｓｉ，Ｍｎ，Ｃｒ，Ｎｉ，Ａｌ，Ｔｉ，Ｂ，Ｎｂおよび
Ｆｅからなる組成を限定し、酸素含有量および清浄度を
特定して、高温特性とともに室温特性を改善する開示が
ある。更に、特公昭５７ー８１８３号公報には、Ｆｅ−
Ｎｉ−Ｃｒオーステナイト系耐熱鋳鋼の炭素量を増加さ
せるとともに、Ｎｂ，Ｃｏを添加して、高温耐酸化性を
低下させずに、高温強度を向上する開示がある。更に、
特開平５−５１６１号公報には、Ｆｅ−Ｎｉ−Ｃｒオー
ステナイト系耐熱鋳鋼にＮｂ，Ｗ，Ｍｏ，Ｂ，Ｃｏを添
加して、高温強度を飛躍的に向上する開示がある。As an austenitic heat-resistant cast steel, Japanese Patent Laid-Open No. 61-87852 discloses C, Si, Mn, N, N.
There is a disclosure in which a composition consisting of i, Cr, V, Nb, Ti, B, W and Fe is specified to improve creep strength and proof stress. Further, Japanese Patent Laid-Open No. 61-177352 discloses C,
There is a disclosure in which the composition of Si, Mn, Cr, Ni, Al, Ti, B, Nb and Fe is limited, the oxygen content and the cleanliness are specified, and the room temperature characteristics as well as the high temperature characteristics are improved. Further, in Japanese Patent Publication No. 57-8183, Fe-
There is a disclosure that the carbon content of Ni-Cr austenitic heat-resistant cast steel is increased and Nb and Co are added to improve the high temperature strength without lowering the high temperature oxidation resistance. Furthermore,
Japanese Unexamined Patent Publication (Kokai) No. 5-5161 discloses that high temperature strength is dramatically improved by adding Nb, W, Mo, B and Co to Fe-Ni-Cr austenitic heat resistant cast steel.
【０００４】[0004]
【発明が解決しようとする課題】上記、従来の耐熱鋳
鉄、耐熱鋳鋼のうち、オーステナイト鋳鉄は、９００℃
までは高温強度は比較的良好であるが、それ以上の温度
では耐久性が劣る。また、このオーステナイト鋳鉄は、
Ｎｉ含有量が多く高価であるという問題点がある。その
他にフェライト系耐熱鋳鋼があるが、通常のフェライト
系耐熱鋳鋼は、９００℃以上の高温強度が絶対的に劣る
という問題点がある。Among the above-mentioned conventional heat-resistant cast iron and heat-resistant cast steel, austenitic cast iron is 900 ° C.
Up to, the high temperature strength is relatively good, but at higher temperatures, the durability is poor. Also, this austenitic cast iron is
There is a problem that the Ni content is high and the cost is high. In addition, there are ferritic heat-resistant cast steels, but ordinary ferritic heat-resistant cast steels have a problem that their high-temperature strength at 900 ° C. or higher is absolutely inferior.
【０００５】また、上記特開昭６１−８７８５２号公報
のものは、Ｃ量が０．１５重量％以下と低いことによ
り、９００℃以上での高温強度が不足し、またＴｉを
０．００２〜０．５重量％含有するため、大気溶解では
有害な非金属介在物の生成を招く恐れがある。Further, in the above-mentioned Japanese Patent Laid-Open No. 61-87852, since the C content is as low as 0.15% by weight or less, the high temperature strength at 900 ° C. or more is insufficient, and the Ti content is 0.002 to 0.002. Since it is contained in an amount of 0.5% by weight, there is a possibility that harmful non-metallic inclusions may be produced by melting in air.
【０００６】また、上記特開昭６１−１７７３５２号公
報のものは、Ｎｉを多量に含有するため、高温でイオウ
（Ｓ）雰囲気が存在すると、損傷を受ける虞れがある。Further, since the above-mentioned Japanese Patent Laid-Open No. 61-177352 contains a large amount of Ni, it may be damaged if a sulfur (S) atmosphere is present at a high temperature.
【０００７】また、特公昭５７−８１８３号公報のもの
は、高炭素（Ｃ）のため、高温で長時間の使用中に脆化
する虞れがある。[0007] Further, Japanese Patent Publication No. 57-8183 has a high carbon (C) content, so that there is a risk of embrittlement during long-term use at high temperature.
【０００８】また、特開平５−５１６１号公報のもの
は、高温に曝される排気系部品に適するものの、オース
テナイト系耐熱鋳鋼特有の被削性に問題がある。Further, the one disclosed in JP-A-5-5161 is suitable for exhaust system parts exposed to high temperatures, but has a problem in machinability peculiar to austenitic heat-resistant cast steel.
【０００９】従って、本発明は、上記従来の耐熱鋳鉄、
耐熱鋳鋼の問題点を解決し、より高温強度および被削性
に優れ、かつ安価に製造可能な耐熱鋳鋼を提供すること
を目的とする。Therefore, the present invention is directed to the above-mentioned conventional heat-resistant cast iron,
It is an object of the present invention to solve the problems of heat-resistant cast steel, to provide heat-resistant cast steel that is superior in high-temperature strength and machinability and can be manufactured at low cost.
【００１０】本発明のもう一つの目的は、かかる耐熱鋳
鋼からなる排気系部品を提供することである。Another object of the present invention is to provide an exhaust system component made of such heat-resistant cast steel.
【００１１】[0011]
【課題を解決するための手段】上記目的に鑑み鋭意研究
の結果、本発明者らは、Ｎｉ−Ｃｒ基オーステナイト系
耐熱鋳鋼に、Ｎｂ、ＷおよびＭｏの１種または２種、Ｓ
あるいはそれらにＮを適量添加することにより、高温強
度および被削性を向上することができることを見い出
し、本発明に想到した。As a result of earnest research in view of the above objects, the present inventors have found that Ni-Cr-based austenitic heat-resistant cast steel contains one or two of Nb, W and Mo, and S.
Alternatively, they have found that the high temperature strength and machinability can be improved by adding an appropriate amount of N to them, and have conceived the present invention.
【００１２】すなわち、本第１の発明の高温強度および
被削性の優れたオーステナイト系耐熱鋳鋼は、重量比率
で、 Ｃ ： ０．２ 〜 ０．６％， Ｓｉ： ２ ％以下， Ｍｎ： ２ ％以下， Ｎｉ： ８ 〜２０ ％， Ｃｒ：１５ 〜３０ ％， Ｎｂ： ０．２ 〜 １ ％， ＷおよびＭｏの１種または２種以上で、Ｗ＋Ｍｏ／２：
１〜６％， Ｓ ： ０．０１ 〜 ０．５％， 残部：Ｆｅおよび不可避不純物からなることを特徴とす
る。That is, the austenitic heat-resistant cast steel of the first invention, which is excellent in high temperature strength and machinability, has a weight ratio of C: 0.2 to 0.6%, Si: 2% or less, Mn: 2 % Or less, Ni: 8 to 20%, Cr: 15 to 30%, Nb: 0.2 to 1%, one or more of W and Mo, and W + Mo / 2:
1 to 6%, S: 0.01 to 0.5%, balance: Fe and unavoidable impurities.
【００１３】次に、本第２の発明の高温強度および被削
性に優れたオーステナイト系耐熱鋳鋼は、重量比率で、 Ｃ ： ０．２ 〜 ０．６％， Ｓｉ： ２ ％以下， Ｍｎ： ２ ％以下， Ｎｉ： ８ 〜２０ ％， Ｃｒ：１５ 〜３０ ％， Ｎｂ： ０．２ 〜 １ ％， ＷおよびＭｏの１種または２種以上で、Ｗ＋Ｍｏ／２：
１〜６％， Ｓ ： ０．０１ 〜 ０．５％， Ｎ ： ０．０１ 〜 ０．３％， 残部：Ｆｅおよび不可避不純物 からなることを特徴とする。Next, the austenitic heat-resistant cast steel excellent in high temperature strength and machinability according to the second aspect of the present invention is, by weight ratio, C: 0.2 to 0.6%, Si: 2% or less, Mn: 2% or less, Ni: 8 to 20%, Cr: 15 to 30%, Nb: 0.2 to 1%, one or more of W and Mo, and W + Mo / 2:
1 to 6%, S: 0.01 to 0.5%, N: 0.01 to 0.3%, balance: Fe and unavoidable impurities.
【００１４】本第３の発明の排気系部品は、上記第１ま
たは第２の発明に記載の高温強度および被削性の優れた
オーステナイト系耐熱鋳鋼からなる。そして、この排気
系部品としては、エキゾーストマニホールドまたはター
ビンハウジングである。The exhaust system component of the third aspect of the invention is made of the austenitic heat-resistant cast steel excellent in high temperature strength and machinability described in the first or second aspect of the invention. The exhaust system component is an exhaust manifold or a turbine housing.
【００１５】[0015]
【作用】以下、本発明の高温強度および被削性の優れた
オーステナイト系耐熱鋳鋼の各合金元素の組成範囲の限
定理由について詳細に説明する。The reason for limiting the composition range of each alloy element of the austenitic heat-resistant cast steel excellent in high temperature strength and machinability of the present invention will be described in detail below.
【００１６】（１）Ｃ（炭素）：０．２〜０．６％ Ｃは、溶湯の流動性すなわち鋳造性を良くする作用があ
り、また一部基地に固溶して、固溶強化する作用があ
る。さらに、一次炭化物を形成し、高温強度を高めるの
に必要である。このような作用を有効に発揮するために
は、Ｃは少なくとも０．２％以上必要である。(1) C (carbon): 0.2 to 0.6% C has the effect of improving the fluidity of the molten metal, that is, the castability, and also forms a solid solution in a part of the matrix to strengthen the solid solution. It has an effect. Further, it is necessary to form primary carbides and enhance high temperature strength. In order to effectively exhibit such an effect, C is required to be at least 0.2% or more.
【００１７】一方、Ｃの含有量が０．６％を越えると二
次炭化物が過剰に析出し、靱性を著しく劣化する。この
ため、Ｃは０．２〜０．６％とする。強度と靱性のバラ
ンスから、望ましくは、Ｃは０．２５〜０．５％であ
る。On the other hand, when the content of C exceeds 0.6%, secondary carbides are excessively precipitated and the toughness is significantly deteriorated. Therefore, C is 0.2 to 0.6%. From the balance of strength and toughness, C is preferably 0.25 to 0.5%.
【００１８】（２）Ｓｉ（ケイ素）：２％以下 Ｓｉは、溶湯の脱酸剤としての役割を有するほか、耐酸
化性の改善に有効な元素である。しかし、過剰に加える
とオーステナイト組織が不安定になり、高温強度の劣化
を招くので、Ｓｉの含有量は２％以下とする。組織安定
性の点から、望ましくは０．３〜１．５％である。(2) Si (silicon): 2% or less Si has a role as a deoxidizing agent for the molten metal, and is an element effective for improving the oxidation resistance. However, if added excessively, the austenite structure becomes unstable and the high temperature strength deteriorates. Therefore, the Si content is set to 2% or less. From the viewpoint of tissue stability, it is preferably 0.3 to 1.5%.
【００１９】（３）Ｍｎ（マンガン）：２％以下 Ｍｎは、Ｓｉと同様に溶湯の脱酸剤として有効である
が、あまり多く加えると耐酸化性が劣化するので、２％
以下とする。耐酸化性を考慮して、望ましくは０．３〜
１．５％である。(3) Mn (manganese): 2% or less Mn is effective as a deoxidizing agent for the molten metal like Si, but if added too much, the oxidation resistance deteriorates, so 2%.
Below. Considering the oxidation resistance, it is preferably 0.3 to
It is 1.5%.
【００２０】（４）Ｎｉ（ニッケル）：８〜２０％ Ｎｉは、後記のＣｒとともに本発明の耐熱鋳鋼をオース
テナイト組織とし、その組織を安定にして高温強度を高
めるのに有効な元素である。特に、９００℃以上の高温
域において良好な高温強度を有するためには、８％以上
の添加が必要である。Ｎｉの増加とともに上記特性は向
上するが、２０％を越えても効果は飽和し、経済的にも
不利である。そのためＮｉ含有量は８〜２０％とする。
強度と経済的な面を考慮して、望ましくは８〜１５％で
ある。(4) Ni (nickel): 8 to 20% Ni is an element effective in stabilizing the structure of the heat-resistant cast steel of the present invention and austenite structure and enhancing high temperature strength together with Cr described later. In particular, in order to have good high temperature strength in a high temperature range of 900 ° C. or higher, it is necessary to add 8% or more. The above characteristics improve with an increase in Ni, but even if it exceeds 20%, the effect is saturated, which is economically disadvantageous. Therefore, the Ni content is 8 to 20%.
Considering strength and economic aspects, it is preferably 8 to 15%.
【００２１】（５）Ｃｒ（クロム）：１５〜３０％ Ｃｒは、上記Ｎｉと共存し、鋳鋼組織をオーステナイト
化して、高温強度や耐酸化性を高めるほか、炭化物を形
成し高温強度を高めるのに有効な元素である。特に、９
００℃以上の高温域でこれらの効果を有効なものにする
ためには、１５％以上の添加が必要である。しかし、添
加量が３０％を越えると、過剰に二次炭化物が析出する
こと、更にはσ相などの脆い析出物などが析出し、脆化
が著しくなる。そのためＣｒ含有量を１５〜３０％とす
る。組織安定性を考慮して、望ましくは１７〜２５％で
ある。(5) Cr (Chromium): 15 to 30% Cr coexists with Ni to austenite the cast steel structure to enhance high temperature strength and oxidation resistance, and also to form carbides to enhance high temperature strength. Is an effective element. Especially, 9
In order to make these effects effective in a high temperature range of 00 ° C. or higher, addition of 15% or more is necessary. However, if the amount added exceeds 30%, secondary carbides are excessively precipitated, and brittle precipitates such as σ phase are precipitated, resulting in significant embrittlement. Therefore, the Cr content is set to 15 to 30%. Considering the tissue stability, it is preferably 17 to 25%.
【００２２】（６）Ｎｂ（ニオブ）：０．２〜１％ Ｎｂは、Ｃと結合して微細な炭化物を形成し、高温強度
を改善する。また、Ｃｒの炭化物の生成を抑制すること
によって耐酸化性を向上させる。これらの効果を有効に
発揮させるためには、０．２％以上の添加が必要であ
る。しかし、多量の添加は靱性を劣化させるので上限を
１％とする。そのため、Ｎｂの含有量は０．２〜１％と
する。靱性を考慮して、望ましくは０．３〜０．８％で
ある。(6) Nb (niobium): 0.2 to 1% Nb combines with C to form fine carbides and improves high temperature strength. Further, the oxidation resistance is improved by suppressing the formation of Cr carbide. In order to exert these effects effectively, it is necessary to add 0.2% or more. However, addition of a large amount deteriorates toughness, so the upper limit is made 1%. Therefore, the Nb content is 0.2 to 1%. Considering toughness, it is preferably 0.3 to 0.8%.
【００２３】（７）Ｗ（タングステン）およびＭｏ（モ
リブデン）の１種または２種以上で、Ｗ＋Ｍｏ／２：１
〜６％， ＷおよびＭｏは高温強度を改善する。この効果を得るた
めには１％以上の添加（重量比率でＷ＝２Ｍｏの関係が
ある）が必要である。しかし、多量に添加すると耐酸化
性が劣化するので６％が上限である。そのためＷの含有
量は１〜６％とする。強度と耐酸化性を考慮して、望ま
しくは２〜４％である。なお、ＷとＭｏの効果を比較す
ると、ＷはＭｏに比して融点が高いことにより、高温強
度特に９００℃以上の高温強度向上に寄与する程度が大
きい。また、ＷはＭｏより耐酸化性が優れるので高温用
途の場合、Ｗ含有鋳鋼の方がＭｏ含有鋳鋼より有利であ
る。(7) One or more of W (tungsten) and Mo (molybdenum), W + Mo / 2: 1
~ 6%, W and Mo improve high temperature strength. In order to obtain this effect, addition of 1% or more (the relationship of W = 2Mo in weight ratio) is required. However, if added in a large amount, the oxidation resistance deteriorates, so 6% is the upper limit. Therefore, the W content is set to 1 to 6%. Considering strength and oxidation resistance, it is preferably 2 to 4%. Comparing the effects of W and Mo, W has a higher melting point than Mo, so that W contributes greatly to the improvement of high temperature strength, particularly at 900 ° C. or higher. Further, since W has better oxidation resistance than Mo, W-containing cast steel is more advantageous than Mo-containing cast steel in high temperature applications.
【００２４】（８）Ｓ（硫黄）：０．０１〜０．５％ Ｓは鋳鋼においては球状もしくは塊状の硫化物を生成
し、機械加工において切粉の分断を促進するため被削性
が向上する。この効果を得るためには０．０１％以上必
要である。しかし、多量に含有すると粒界に硫化物が多
量に析出し、高温強度を劣化させるので０．５％を上限
とする。そのため、Ｓの含有量は０．０１〜０．５％と
する。被削性と高温強度のバランスを考慮して、望まし
くは０．０３〜０．２５％である。(8) S (sulfur): 0.01 to 0.5% S forms spherical or massive sulfides in cast steel and promotes cutting of chips during machining, improving machinability. To do. To obtain this effect, 0.01% or more is necessary. However, if contained in a large amount, a large amount of sulfide will be precipitated at the grain boundaries and deteriorate the high temperature strength, so 0.5% is made the upper limit. Therefore, the content of S is set to 0.01 to 0.5%. Considering the balance between machinability and high temperature strength, it is preferably 0.03 to 0.25%.
【００２５】（９）Ｎ（窒素）：０．０１〜０．３％ Ｎは強力なオーステナイト生成元素であり、オーステナ
イト基地を安定にする。また、結晶粒微細化に有効な元
素であり、本発明のような鍛造・圧延などの加工による
結晶粒微細化が不可能な鋳造部材では極めて有効であ
る。この結晶粒微細化により構造物として重要な材料の
延性の確保が可能になり、また、本系耐熱鋳鋼のような
オーステナイト系耐熱鋳鋼に特有な被削性が悪いという
欠点を改善できる。また、ＮはＣの拡散速度を遅らせ析
出炭化物の凝集を遅らせるので、脆化に対して有効であ
る。この効果を得るためには、０．０１％以上の添加が
必要である。しかし、多量に添加すると、Ｃｒ2Ｎ-Ｃｒ
23Ｃ6 の粒界析出を生じ、脆化を促進する一方、有効な
Ｃｒ量が減少し耐酸化性を劣化させるので、０．３％を
上限とする。脆化と耐酸化性を考慮して、望ましくは
０．０３〜０．２％である。(9) N (nitrogen): 0.01 to 0.3% N is a strong austenite forming element and stabilizes the austenite matrix. Further, it is an element effective for refining the crystal grains, and is extremely effective for a cast member in which the refining of the crystal grains by processing such as forging and rolling is impossible as in the present invention. This refinement of crystal grains makes it possible to secure the ductility of a material important as a structure, and it is possible to improve the disadvantage of poor machinability peculiar to austenitic heat-resistant cast steel such as the present heat-resistant cast steel. Further, N delays the diffusion rate of C and delays the agglomeration of precipitated carbides, and is therefore effective against embrittlement. To obtain this effect, addition of 0.01% or more is necessary. However, if added in a large amount, Cr 2 N-Cr
The grain boundary precipitation of 23 C 6 occurs and promotes embrittlement, while reducing the effective Cr amount and deteriorating the oxidation resistance, so the upper limit is 0.3%. Considering embrittlement and oxidation resistance, it is preferably 0.03 to 0.2%.
【００２６】このような本発明の高温強度および被削性
の優れたオーステナイト系耐熱鋳鋼は、特に自動車の排
気系部品として、エンジンに取り付けられるエキゾース
トマニホールドやタービンハウジングとして薄肉に鋳造
して用い、加熱冷却のサイクルを受けても変形が僅かで
あり、優れた耐久性を有する。The austenitic heat-resistant cast steel excellent in high-temperature strength and machinability according to the present invention is used as an exhaust system part of an automobile, particularly as an exhaust manifold or turbine housing attached to an engine, after being thinly cast and used. Even if it undergoes a cooling cycle, it is slightly deformed and has excellent durability.
【００２７】[0027]
【実施例】以下、本発明を実施例により説明する。実施例１〜１７、従来例２１〜２４ 表１に示す種類の組成の耐熱材料について、ＪＩＳ規格
Ｙ形Ｂ号供試材を作製した。なお、鋳造にあたっては、
１００ｋｇ用高周波炉を用いて大気溶解し、直ちに１５
５０℃以上で出湯して１５００℃以上で注湯した。EXAMPLES The present invention will be described below with reference to examples. Examples 1 to 17 and Conventional Examples 21 to 24 JIS standard Y-shaped No. B test materials were prepared for heat-resistant materials having the compositions shown in Table 1. When casting,
Immediately dissolve in air using a 100 kg high-frequency furnace and immediately
Hot water was poured out at 50 ° C or higher and poured at 1500 ° C or higher.
【００２８】本発明材（実施例１〜１７）のオーステナ
イト系耐熱鋳鋼については、鋳造時の湯流れが良く、鋳
造欠陥の発生が見られなかった。次に、鋳造した本発明
材（実施例１〜１７）、および従来例２１、２２、２３
および２４の供試材（Ｙブロック）を加熱炉にて１００
０℃で２時間保持後空冷する熱処理を行った。Regarding the austenitic heat-resistant cast steels of the present invention materials (Examples 1 to 17), the flow of molten metal during casting was good and no casting defects were found. Next, the cast material of the present invention (Examples 1 to 17) and conventional examples 21, 22, and 23.
And 24 sample materials (Y block) in a heating furnace for 100
A heat treatment of holding at 0 ° C. for 2 hours and then air cooling was performed.
【００２９】なお、表１において、従来材（従来例２１
〜２４）は自動車のターボチャージャー用ハウジングや
エキゾーストマニホールド等の耐熱部品に使用されてい
るもので、従来例２１および２２の供試材は、それぞれ
耐熱性オーステナイト鋳鉄のニレジスト鋳鉄Ｄ２および
Ｄ５Ｓである。また、従来例２３は汎用オーステナイト
系耐熱鋳鋼で，ＪＩＳ規格ＳＣＨ−１２である。また、
従来例２４は特開平５−５１６１号公報に開示されるオ
ーステナイト系耐熱鋳鋼である。In Table 1, conventional materials (conventional example 21
24 to 24) are used for heat-resistant parts such as automobile turbocharger housings and exhaust manifolds, and the test materials of Conventional Examples 21 and 22 are heat-resistant austenitic cast iron Niresist cast irons D2 and D5S, respectively. Further, Conventional Example 23 is a general-purpose austenitic heat-resistant cast steel, which is JIS standard SCH-12. Also,
Conventional example 24 is an austenitic heat-resistant cast steel disclosed in Japanese Unexamined Patent Publication No. 5-5161.
【００３０】[0030]
【表１】 化学成分（重量％） 実施例 C Si Mn Ni Cr Nb W Mo S N No.1 0.22 0.72 0.75 8.22 15.55 0.26 1.25 - 0.02 - 2 0.42 0.99 1.12 10.08 21.12 0.50 3.67 - 0.14 - 3 0.58 1.63 1.72 19.52 29.33 0.91 5.82 - 0.42 - 4 0.45 0.82 0.84 13.22 22.75 0.42 3.11 - 0.20 - 5 0.42 0.54 1.02 10.24 20.65 0.49 3.02 - 0.08 - 6 0.41 0.75 0.80 10.12 20.23 0.46 - 0.53 0.12 - 7 0.44 0.82 0.91 10.08 20.11 0.47 - 1.62 0.11 - 8 0.39 0.66 0.71 10.21 20.43 0.51 - 2.98 0.13 - 9 0.38 0.52 0.88 10.43 20.35 0.53 2.01 1.13 0.15 - 10 0.40 1.02 0.92 10.13 19.98 0.52 2.98 - 0.15 0.02 11 0.45 1.13 0.96 9.92 20.08 0.52 2.99 - 0.16 0.08 12 0.38 0.88 1.05 10.43 19.82 0.55 3.15 - 0.13 0.15 13 0.41 0.76 0.89 10.02 20.15 0.53 3.09 - 0.15 0.09 14 0.42 0.91 0.82 10.18 20.19 0.55 - 0.66 0.14 0.10 15 0.43 0.68 0.69 10.33 20.51 0.49 - 1.48 0.11 0.11 16 0.46 0.85 0.98 10.07 20.05 0.52 - 2.88 0.13 0.12 17 0.37 1.02 0.85 10.28 20.33 0.50 2.05 1.02 0.15 0.09 従来例 C Si Mn Ni Cr Nb W Mo S N 21 2.77 2.12 0.88 21.10 2.44 - - - - - 22 1.89 5.32 0.41 34.50 2.35 - - - - - 23 0.21 1.24 0.50 9.1 18.80 - - - - - 24 0.41 1.02 0.48 10.50 20.08 0.49 3.01 - - - [Table 1] Chemical composition (wt%) Example C Si Mn Ni Cr Nb W Mo S N No.1 0.22 0.72 0.75 8.22 15.55 0.26 1.25-0.02-2 0.42 0.99 1.12 10.08 21.12 0.50 3.67-0.14-3 0.58 1.63 1.72 19.52 29.33 0.91 5.82-0.42-4 0.45 0.82 0.84 13.22 22.75 0.42 3.11-0.20-5 0.42 0.54 1.02 10.24 20.65 0.49 3.02-0.08-6 0.41 0.75 0.80 10.12 20.23 0.46-0.53 0.12-7 0.44 0.82 0.91 10.08 20.11 0.47-1.62 0.11 -8 0.39 0.66 0.71 10.21 20.43 0.51-2.98 0.13-9 0.38 0.52 0.88 10.43 20.35 0.53 2.01 1.13 0.15-10 0.40 1.02 0.92 10.13 19.98 0.52 2.98-0.15 0.02 11 0.45 1.13 0.96 9.92 20.08 0.52 2.99-0.16 0.08 12 0.38 0.88 1.05 10.43 19.82 0.55 3.15-0.13 0.15 13 0.41 0.76 0.89 10.02 20.15 0.53 3.09-0.15 0.09 14 0.42 0.91 0.82 10.18 20.19 0.55-0.66 0.14 0.10 15 0.43 0.68 0.69 10.33 20.51 0.49-1.48 0.11 0.11 16 0.46 0.85 0.98 10.07 20.05 0.52-2.88 0.13 0.12 17 0.37 1.02 0.85 10.28 20.33 0.50 2.05 1.02 0.15 0.09 Conventional example C Si Mn Ni Cr Nb W Mo S N 21 2.77 2.12 0.88 21.10 2.44---- -22 1.89 5.32 0.41 34.50 2.35-----23 0.21 1.24 0.50 9.1 18.80-----24 0.41 1.02 0.48 10.50 20.08 0.49 3.01---
【００３１】次に、各供試材を用いて、以下に述べる各
種の評価試験を行った。 （１）室温引張試験 標点間距離が５０ｍｍ、標点の直径が１４ｍｍの丸棒試
験片（ＪＩＳ４号試験片）を用いて行った。Next, various evaluation tests described below were carried out using each test material. (1) Room Temperature Tensile Test A round bar test piece (JIS No. 4 test piece) having a gauge length of 50 mm and a gauge diameter of 14 mm was used.
【００３２】（２）高温引張試験 標点間距離が５０ｍｍ、標点の直径が１０ｍｍのつばつ
き試験片を用いて、１０００℃で行った。(2) High Temperature Tensile Test Using a brim test piece having a gauge length of 50 mm and a gauge diameter of 10 mm, the test was conducted at 1000 ° C.
【００３３】（３）熱疲労試験 標点間距離が２０ｍｍ，標点間の直径が１０ｍｍの丸棒
試験片を用いて、加熱冷却に伴う伸び縮みを機械的に完
全に拘束した状態で、下記の条件で加熱冷却サイクルを
繰り返し、熱疲労破壊を起こさせた。下限温度：１５０
℃上限温度：１０００℃各１サイククル：１２分なお、
試験機として、電気−油圧サーボ方式の熱疲労試験機を
用いた。(3) Thermal Fatigue Test Using a round bar test piece having a gauge length of 20 mm and a gauge diameter of 10 mm, the following test was carried out while mechanically completely restraining expansion and contraction due to heating and cooling. The heating and cooling cycle was repeated under the conditions of 1 to cause thermal fatigue failure. Lower limit temperature: 150
℃ upper limit temperature: 1000 ℃ 1 cycle each: 12 minutes
An electro-hydraulic servo type thermal fatigue tester was used as the tester.
【００３４】（４）酸化試験 直径１０ｍｍ，長さ２０ｍｍの丸棒試験片を作製し、１
０００℃において２００時間大気中に保持し、取り出し
後にショットブラスト処理を施して酸化スケールを除去
し、酸化試験前後の単位面積あたりの重量変化（酸化減
量：ｍｇ／ｍｍ２ ）を求めることにより、耐酸化性を
評価した。以上の室温引張試験結果を表３に、高温引張
試験結果を表４に、熱疲労試験結果および酸化試験結果
を表５に示す。(4) Oxidation test A round bar test piece having a diameter of 10 mm and a length of 20 mm was prepared and
It is kept in the air at 000 ° C for 200 hours, and after it is taken out, shot blasting is applied to remove the oxide scale, and the weight change per unit area before and after the oxidation test (oxidation weight loss: mg / mm2) is determined. The sex was evaluated. The above room temperature tensile test results are shown in Table 3, the high temperature tensile test results are shown in Table 4, and the thermal fatigue test results and oxidation test results are shown in Table 5.
【００３５】（５）被削性試験 被削性試験が、この種の材料で最も被削性が問題となる
ドリル試験にて調査した。表２に示すような条件で試験
を行い、１０回穴明けを行った後、ドリルの逃げ面摩耗
幅を測定し、更に１穴当りの摩耗幅を比較した。(5) Machinability test A machinability test was conducted by a drill test in which the machinability of this type of material was the most problematic. The test was conducted under the conditions shown in Table 2, and after drilling 10 times, the flank wear width of the drill was measured and the wear width per hole was compared.
【００３６】[0036]
【表２】 項目 切 削 条 件 工作機械 マシンニングセンタ（５．５ｋＷ） ドリル ソリッド超硬ドリル（φ６．８） 切削速度 ４０ｍ／ｍｉｎ 送り ０．２ｍｍ／ｒｅｖ，ステップフィード 穴深さ ２０ｍｍ 突出長さ ４２ｍｍ 切削油 油性 [Table 2] Item Cutting Condition Machine tool Machining center (5.5kW) Drill Solid Carbide drill (φ6.8) Cutting speed 40m / min Feed 0.2mm / rev, Step feed Hole depth 20mm Projection length 42mm cutting oil oily
【００３７】[0037]
【表３】 室温引張試験結果 0.2%耐力 引張強さ 伸び 硬さ (MPa) (MPa) (%) (HB) 実施例 No. 1 245 605 20 170 2 355 570 12 187 3 385 590 6 223 4 365 555 12 197 5 350 560 15 187 6 310 580 16 187 7 330 550 18 192 8 350 560 12 197 9 350 550 18 197 10 360 550 18 192 11 350 565 20 197 12 345 560 20 192 13 355 575 15 192 14 320 570 18 187 15 350 550 12 192 16 360 560 10 197 17 360 570 10 197 従来例 No.21 190 455 16 179 22 255 485 9 163 23 250 560 20 170 24 350 560 4 201 [Table 3] Results of tensile test at room temperature 0.2% proof stress Tensile strength Elongation hardness (MPa) (MPa) (%) (HB) Example No. 1 245 605 20 170 2 355 570 12 187 3 385 590 6 223 4 365 555 12 197 5 350 560 15 187 6 310 580 16 187 7 330 550 18 192 8 350 560 12 197 9 350 550 18 197 10 360 550 18 192 11 350 565 20 197 12 345 560 20 192 13 355 575 15 192 14 320 570 18 187 15 350 550 12 192 16 360 560 10 197 17 360 570 10 197 Conventional example No. 21 190 455 16 179 22 255 485 9 163 23 250 560 20 170 24 350 560 4 201
【００３８】[0038]
【表４】 高温引張試験結果（１０００℃） 0.2%耐力 引張強さ 伸び (MPa) (MPa) (%) 実施例 No.1 62 66 68 2 65 100 42 3 75 110 22 4 65 102 37 5 70 100 38 6 60 88 58 7 62 93 48 8 65 95 38 9 65 97 33 10 60 85 48 11 65 100 40 12 61 97 52 13 65 90 28 14 62 90 42 15 65 95 33 16 63 97 28 17 65 97 30 従来例 No.21 33 41 33 22 33 44 29 23 35 55 49 24 66 108 26 [Table 4] High temperature tensile test result (1000 ° C) 0.2% proof stress Tensile strength Elongation (MPa) (MPa) (%) Example No. 1 62 66 68 2 65 100 42 3 75 110 22 4 65 102 37 5 70 100 38 6 60 88 58 7 62 93 48 8 65 95 38 9 65 97 33 10 60 85 48 11 65 100 40 12 61 97 52 13 65 90 28 14 62 90 42 15 65 95 33 16 63 97 28 17 65 97 30 Conventional example No. 21 33 41 33 22 33 44 29 23 35 55 49 24 66 108 26
【００３９】[0039]
【表５】 熱疲労試験結果および酸化試験結果 熱疲労寿命 酸化減量 （サイクル） （mg/mm2） 実施例 No.1 95 50 2 200 25 3 220 22 4 180 27 5 195 28 6 120 38 7 135 42 8 155 50 9 155 45 10 175 25 11 185 38 12 195 30 13 180 38 14 125 40 15 140 42 16 150 55 17 155 50 従来例 No.21 56 765 22 85 55 23 80 85 24 180 25 [Table 5] Thermal fatigue test results and oxidation test results Thermal fatigue life Oxidation weight loss (cycle) (mg / mm2) Example No. 1 95 50 2 200 25 3 220 22 4 180 27 5 195 28 6 120 38 7 135 42 8 155 50 9 155 45 10 175 25 11 185 38 12 195 30 13 180 38 14 125 40 15 140 42 16 150 55 17 155 50 Conventional example No. 21 56 765 22 85 55 23 80 85 24 180 25
【００４０】表６にドリルによる被削性試験結果を示
す。Table 6 shows the results of the machinability test using a drill.
【表６】 被削性試験；一刃当りの摩耗量（ｍｍ） 実施例 No.1 0.025 2 0.006 3 0.005 4 0.006 5 0.010 6 0.015 7 0.012 8 0.010 9 0.015 10 0.009 11 0.007 12 0.005 13 0.009 14 0.010 15 0.008 16 0.015 17 0.015 従来例 21 0.005 22 0.005 23 0.095 24 0.105[Table 6] Machinability test; wear amount per blade (mm) Example No.1 0.025 2 0.006 3 0.005 4 0.006 5 0.010 6 0.015 7 0.012 8 0.010 9 0.015 10 0.009 11 0.007 12 0.005 13 0.009 14 0.010 15 0.008 16 0.015 17 0.015 Conventional example 21 0.005 22 0.005 23 0.095 24 0.105
【００４１】表３、表４および表５から明らかなよう
に、本発明による実施例１〜１７は、従来材である従来
例２１、２２のニレジスト鋳鉄Ｄ２およびＤ５Ｓ、更に
従来例２３のＳＣＨ−１２と比較して、高温強度が著し
く改善され、室温性質が同等以上であることがわかる。
更に、従来例２４の特開平５−５１６１号公報に開示さ
れるオーステナイト系耐熱鋳鋼と機械的性質がほぼ同等
の性能を有していることがわかる。As is clear from Tables 3, 4, and 5, Examples 1 to 17 according to the present invention are the Niresist cast irons D2 and D5S of Conventional Examples 21 and 22 which are conventional materials, and SCH- of Conventional Example 23. It can be seen that, as compared with No. 12, the high temperature strength is remarkably improved, and the room temperature properties are equal or higher.
Further, it can be seen that the austenitic heat-resistant cast steel disclosed in JP-A-5-5161 of Conventional Example 24 has substantially the same mechanical properties.
【００４２】表６から明らかなように本発明による実施
例１〜１７は、従来例２３および２４のオーステナイト
系耐熱鋳鋼と比較して著しく被削性が改善されているこ
とがわかる。As is clear from Table 6, Examples 1 to 17 according to the present invention are remarkably improved in machinability as compared with the austenitic heat-resistant cast steels of Conventional Examples 23 and 24.
【００４３】次に、実施例２、６、９、１１、１５およ
び１７のオーステナイト系耐熱鋳鋼を用いて、自動車用
排気系部品のエキゾーストマニホールド（肉厚：２．０
〜３．４ｍｍ）およびタービンハウジング（肉厚：２．
７〜４．１ｍｍ）を鋳造した。得られた排気系部品はい
ずれも健全なものであった。Next, using the austenitic heat-resistant cast steels of Examples 2, 6, 9, 11, 15 and 17, the exhaust manifold (wall thickness: 2.0
~ 3.4 mm) and turbine housing (wall thickness: 2.
7 to 4.1 mm) was cast. The obtained exhaust system parts were all sound.
【００４４】更に、これらの排気系部品に機械加工を施
して、切削性の評価を行ったが、いずれのものにも何等
問題は生じなかった。Further, these exhaust system parts were subjected to machining to evaluate their machinability, but no problems occurred in any of them.
【００４５】次に、エキゾーストマニホールドとタービ
ンハウジングを組み付けた直列４気筒で排気量２０００
ｃｃの高性能ガソリンエンジン相当の排気ガスを発する
排気シミュレータにより、耐久試験を実施した。試験条
件として、６０００回転相当での全負荷運転（連続１４
分）−アイドリング（１分）−完全停止（１４分）−ア
イドリング（１分）を１サイクルとする熱冷（ＧＯ−Ｓ
ＴＯＰ）サイクルを、５００サイクルまで実施した。全
負荷時の排気ガス温度は、タービンハウジングの入口温
度で、１０５０℃であった。この条件下でのエキゾース
トマニホールドの表面温度は、エキゾーストマニホール
ドの集合部で、約９８０℃、タービンハウジングの表面
温度は、ウエストゲート部で約１０２０℃であった。評
価試験の結果、熱変形によるガスの漏洩や熱亀裂は生じ
ず、優れた耐久性および信頼性を有することが確認され
た。Next, an in-line 4-cylinder in which an exhaust manifold and a turbine housing are assembled has a displacement of 2000
An endurance test was conducted using an exhaust simulator that emits exhaust gas equivalent to a high-performance gasoline engine of cc. As test conditions, full load operation (continuous 14
Min) -idling (1 min) -complete stop (14 min) -idling (1 min) 1 cycle thermal cooling (GO-S
The TOP) cycle was performed up to 500 cycles. The exhaust gas temperature at full load was 1050 ° C. at the inlet temperature of the turbine housing. Under this condition, the surface temperature of the exhaust manifold was about 980 ° C. at the gathering portion of the exhaust manifold, and the surface temperature of the turbine housing was about 1020 ° C. at the waste gate part. As a result of the evaluation test, it was confirmed that gas leakage and thermal cracking due to thermal deformation did not occur, and that it had excellent durability and reliability.
【００４６】[0046]
【発明の効果】以上の説明の通り、本発明のオーステナ
イト系耐熱鋳鋼は、特に高温領域において強度に優れ、
しかも室温延性を損なわず、かつ鋳造性、被削性に優れ
ているので、安価に製造することがでる。このような本
発明のオーステナイト系耐熱鋳鋼は、エキゾーストマニ
ホールドやタービンハウジング等の自動車用排気系部品
に好適である。本発明のオーステナイト系耐熱鋳鋼から
なる排気系部品は、高温強度に優れ、極めて優れた耐久
性を示す。As described above, the austenitic heat-resistant cast steel of the present invention has excellent strength, especially in the high temperature range.
Moreover, since room temperature ductility is not impaired and castability and machinability are excellent, it is possible to manufacture at low cost. The heat-resistant austenitic cast steel of the present invention is suitable for automobile exhaust system parts such as an exhaust manifold and a turbine housing. The exhaust system component made of the austenitic heat-resistant cast steel of the present invention has excellent high temperature strength and extremely excellent durability.
Claims (5)
１〜６％， Ｓ ： ０．０１ 〜 ０．５％， 残部：Ｆｅおよび不可避不純物からなることを特徴とす
る高温強度および被削性の優れたオーステナイト系耐熱
鋳鋼。1. By weight ratio, C: 0.2 to 0.6%, Si: 2% or less, Mn: 2% or less, Ni: 8 to 20%, Cr: 15 to 30%, Nb: 0. 2 to 1%, one or more of W and Mo, and W + Mo / 2:
1 to 6%, S: 0.01 to 0.5%, balance: Fe and inevitable impurities, an austenitic heat-resistant cast steel excellent in high-temperature strength and machinability.
１〜６％， Ｓ ： ０．０１ 〜 ０．５％， Ｎ ： ０．０１ 〜 ０．３％， 残部：Ｆｅおよび不可避不純物 からなることを特徴とする高温強度および被削性の優れ
たオーステナイト系耐熱鋳鋼。2. By weight ratio, C: 0.2 to 0.6%, Si: 2% or less, Mn: 2% or less, Ni: 8 to 20%, Cr: 15 to 30%, Nb: 0. 2 to 1%, one or more of W and Mo, and W + Mo / 2:
1 to 6%, S: 0.01 to 0.5%, N: 0.01 to 0.3%, balance: Fe and inevitable impurities, austenite excellent in high temperature strength and machinability Series heat-resistant cast steel.
の高温強度および被削性の優れたオーステナイト系耐熱
鋳鋼からなる排気系部品。3. An exhaust system component made of an austenitic heat-resistant cast steel excellent in high temperature strength and machinability according to claim 1 or 2.
エキゾーストマニホールドであることを特徴とする排気
系部品。4. The exhaust system component according to claim 3,
Exhaust system parts characterized by being an exhaust manifold.
タービンハウジングであることを特徴とする排気系部
品。5. The exhaust system component according to claim 3,
An exhaust system component characterized by a turbine housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07580294A JP3458971B2 (en) | 1994-04-14 | 1994-04-14 | Austenitic heat-resistant cast steel with excellent high-temperature strength and machinability, and exhaust system parts made of it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07580294A JP3458971B2 (en) | 1994-04-14 | 1994-04-14 | Austenitic heat-resistant cast steel with excellent high-temperature strength and machinability, and exhaust system parts made of it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07278759A true JPH07278759A (en) | 1995-10-24 |
| JP3458971B2 JP3458971B2 (en) | 2003-10-20 |
Family
ID=13586703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07580294A Expired - Lifetime JP3458971B2 (en) | 1994-04-14 | 1994-04-14 | Austenitic heat-resistant cast steel with excellent high-temperature strength and machinability, and exhaust system parts made of it |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3458971B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1191117A2 (en) * | 2000-09-25 | 2002-03-27 | Daido Steel Company Limited | Stainless cast steel having good heat resistance and good machinability |
| US6383310B1 (en) | 1999-04-05 | 2002-05-07 | Hitachi Metals, Ltd. | Exhaust equipment member, internal combustion engine system using same, and method for producing such exhaust equipment member |
| JP2002167655A (en) * | 2000-09-25 | 2002-06-11 | Daido Steel Co Ltd | Stainless cast steel having excellent heat resistance and machinability |
| WO2005103314A1 (en) * | 2004-04-19 | 2005-11-03 | Hitachi Metals, Ltd. | HIGH-Cr HIGH-Ni AUSTENITIC HEAT-RESISTANT CAST STEEL AND EXHAUST SYSTEM COMPONENT PRODUCED FROM SAME |
| KR100747170B1 (en) * | 2006-05-12 | 2007-08-07 | 현대자동차주식회사 | High temperature oxidation test method for heat-resisting material of exhaust gas system |
| EP2258883A1 (en) * | 2008-02-22 | 2010-12-08 | Hitachi Metals, Ltd. | Austenitic heat-resistant cast steel and exhaust system components made therefrom |
| WO2014147463A1 (en) * | 2013-03-22 | 2014-09-25 | Toyota Jidosha Kabushiki Kaisha | Austenitic heat-resistant cast steel and method for manufacturing the same |
| CN104593692A (en) * | 2014-12-24 | 2015-05-06 | 北京科技大学 | Heat-resistant cast austenitic stainless steel with excellent high-temperature comprehensive properties |
| WO2016117731A1 (en) * | 2015-01-23 | 2016-07-28 | Keyyang Precision Co., Ltd. | Austenitic heat-resistant cast steel and turbine housing for turbocharger using the same |
| CN109023157A (en) * | 2018-09-04 | 2018-12-18 | 云南德胜钢铁有限公司 | A kind of rolled steel bar heating furnace charges stove door plant and its production technology into steel tank |
-
1994
- 1994-04-14 JP JP07580294A patent/JP3458971B2/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6383310B1 (en) | 1999-04-05 | 2002-05-07 | Hitachi Metals, Ltd. | Exhaust equipment member, internal combustion engine system using same, and method for producing such exhaust equipment member |
| EP1191117A2 (en) * | 2000-09-25 | 2002-03-27 | Daido Steel Company Limited | Stainless cast steel having good heat resistance and good machinability |
| JP2002167655A (en) * | 2000-09-25 | 2002-06-11 | Daido Steel Co Ltd | Stainless cast steel having excellent heat resistance and machinability |
| EP1191117A3 (en) * | 2000-09-25 | 2003-10-01 | Daido Steel Company Limited | Stainless cast steel having good heat resistance and good machinability |
| US8241558B2 (en) | 2004-04-19 | 2012-08-14 | Hitachi Metals, Ltd. | High-Cr, high-Ni, heat-resistant, austenitic cast steel and exhaust equipment members formed thereby |
| EP1741799A1 (en) * | 2004-04-19 | 2007-01-10 | Hitachi Metals, Ltd. | HIGH-Cr HIGH-Ni AUSTENITIC HEAT-RESISTANT CAST STEEL AND EXHAUST SYSTEM COMPONENT PRODUCED FROM SAME |
| EP1741799A4 (en) * | 2004-04-19 | 2009-04-01 | Hitachi Metals Ltd | HIGH-Cr HIGH-Ni AUSTENITIC HEAT-RESISTANT CAST STEEL AND EXHAUST SYSTEM COMPONENT PRODUCED FROM SAME |
| WO2005103314A1 (en) * | 2004-04-19 | 2005-11-03 | Hitachi Metals, Ltd. | HIGH-Cr HIGH-Ni AUSTENITIC HEAT-RESISTANT CAST STEEL AND EXHAUST SYSTEM COMPONENT PRODUCED FROM SAME |
| KR100747170B1 (en) * | 2006-05-12 | 2007-08-07 | 현대자동차주식회사 | High temperature oxidation test method for heat-resisting material of exhaust gas system |
| EP2258883A1 (en) * | 2008-02-22 | 2010-12-08 | Hitachi Metals, Ltd. | Austenitic heat-resistant cast steel and exhaust system components made therefrom |
| EP2258883A4 (en) * | 2008-02-22 | 2014-05-14 | Hitachi Metals Ltd | Austenitic heat-resistant cast steel and exhaust system components made therefrom |
| WO2014147463A1 (en) * | 2013-03-22 | 2014-09-25 | Toyota Jidosha Kabushiki Kaisha | Austenitic heat-resistant cast steel and method for manufacturing the same |
| CN104593692A (en) * | 2014-12-24 | 2015-05-06 | 北京科技大学 | Heat-resistant cast austenitic stainless steel with excellent high-temperature comprehensive properties |
| WO2016117731A1 (en) * | 2015-01-23 | 2016-07-28 | Keyyang Precision Co., Ltd. | Austenitic heat-resistant cast steel and turbine housing for turbocharger using the same |
| CN109023157A (en) * | 2018-09-04 | 2018-12-18 | 云南德胜钢铁有限公司 | A kind of rolled steel bar heating furnace charges stove door plant and its production technology into steel tank |
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| Publication number | Publication date |
|---|---|
| JP3458971B2 (en) | 2003-10-20 |
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