JPH0771732B2 - Heat exchange casting having excellent cooling ability and method for producing the same - Google Patents
Heat exchange casting having excellent cooling ability and method for producing the sameInfo
- Publication number
- JPH0771732B2 JPH0771732B2 JP2037291A JP3729190A JPH0771732B2 JP H0771732 B2 JPH0771732 B2 JP H0771732B2 JP 2037291 A JP2037291 A JP 2037291A JP 3729190 A JP3729190 A JP 3729190A JP H0771732 B2 JPH0771732 B2 JP H0771732B2
- Authority
- JP
- Japan
- Prior art keywords
- coating layer
- heat exchanger
- casting
- metal
- pores
- 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.)
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- Blast Furnaces (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、高炉用ステーブクーラー等に適用されて好適
な、冷却能に優れた熱交換体鋳物及びその製造方法に関
する。TECHNICAL FIELD The present invention relates to a heat exchanger casting having excellent cooling ability, which is suitable for application to a blast furnace stave cooler and the like, and a method for producing the same.
［従来の技術］ 一般に、高炉用ステーブクーラー等の熱交換体鋳物は、
冷却媒体の通路となる冷却管を母材に鋳込んで構成され
ている。[Prior Art] Generally, heat exchanger castings such as blast furnace stave coolers are
A cooling pipe that serves as a passage for a cooling medium is cast into a base material.
そして、熱交換体鋳物は、基本的に、（Ａ）、（Ｂ）の
性能を備えることが必要とされる。Then, the heat exchanger casting is basically required to have the performances of (A) and (B).
（Ａ）冷却管と母材との密着性が良く伝熱性に優れるこ
と。(A) Adhesion between the cooling pipe and the base material is good and heat transfer is excellent.
即ち、熱交換体鋳物は、長時間の使用に伴う熱亀裂、折
損、溶損、摩耗等により次第に損耗するが、この損耗
は、鋳物自体の冷却能が高くなるほど、熱負荷が緩和さ
れるため、抑制される。従って、冷却管と母材の間の伝
熱性が良い方が、損耗抑制の点から有利になるのであ
る。That is, the heat exchanger casting is gradually worn out due to thermal cracking, breakage, melting loss, wear, etc., due to long-term use, but this wear is reduced as the cooling capacity of the casting itself becomes higher, and the heat load is alleviated. , Suppressed. Therefore, better heat transfer between the cooling pipe and the base material is advantageous in terms of suppressing wear.
（Ｂ）母材に発生したクラックが冷却管に伝播しないこ
と。(B) Cracks generated in the base material should not propagate to the cooling pipe.
即ち、熱交換体鋳物は、上述の如くの熱亀裂や折損を母
材に生ずるが、この母材の亀裂や折損が鋳造時に同時に
鋳ぐるんだ冷却管に及ぶことを防止する必要があるので
ある。That is, in the heat exchanger casting, the heat cracks and breakages as described above occur in the base metal, but it is necessary to prevent the cracks and breakages of the base metal at the same time during the casting from reaching the chilled cooling pipe. is there.
然るに、従来の熱交換体鋳物にあっては、母材のクラッ
クが冷却管へ進展するのを防止するため、下記〜の
如くの方法により、冷却管を母材に対し、非溶着となる
ように鋳ぐるむこととしている。However, in the conventional heat exchanger casting, in order to prevent the crack of the base metal from propagating to the cooling pipe, the cooling pipe is not welded to the base metal by the following methods. It is supposed to be cast around.
硅石質、クロム質、マグネシア質、シャモット質等の
耐火物を管表面に被覆する方法（特公昭54−44650）。A method of coating the pipe surface with a refractory material such as silica, chrome, magnesia, chamotte (Japanese Patent Publication No. 54-44650).
耐火物を管表面に炎溶射する方法（特公昭54−4196
6）。Method of flame spraying a refractory material onto the tube surface (Japanese Patent Publication No. 54-4196)
6).
二重管の冷却管を鋳ぐるみ、外管が母材に溶着しても
内管は非溶着となる方法（特公昭58−49607）。A method in which the inner pipe is not welded even if the outer pipe is welded to the base material by casting a double-tube cooling pipe (Japanese Patent Publication No. 58-49607).
［発明が解決しようとする課題］ 然しながら、従来技術には下記の問題点がある。[Problems to be Solved by the Invention] However, the prior art has the following problems.
管表面に熱伝導率の低い耐火物層が設けられたり、空隙
が設けられることから、冷却管と母材の間の伝熱性が大
幅に低下する。このことは、熱交換体鋳物の冷却能を劣
化せしめ、前述の（Ａ）の性能を損なうことを意味す
る。Since a refractory layer having a low thermal conductivity is provided on the surface of the pipe or a gap is provided, heat transfer between the cooling pipe and the base material is significantly reduced. This means that the cooling ability of the heat exchanger casting is deteriorated and the above-mentioned performance (A) is impaired.
本発明は、冷却管と母材との伝熱性に優れ、かつ母材に
発生したクラックが冷却管に伝播しない熱交換体鋳物及
びその製造方法を提供することを目的とする。An object of the present invention is to provide a heat exchanger casting which is excellent in heat transfer between the cooling pipe and the base material, and in which cracks generated in the base material do not propagate to the cooling pipe, and a manufacturing method thereof.
［課題を解決するための手段］ 請求項１に記載の本発明は、金属被覆層を外表面に備え
た金属製冷却管を鋳ぐるんでなる熱交換体鋳物であっ
て、該被覆層が、Niと不可避的不純物からなるとともに
気孔を有し、該被覆層の表面及び気孔の一部又は全部が
酸化クロムにより被覆かつ充填されるようにしたもので
ある。[Means for Solving the Problem] The present invention according to claim 1 is a heat exchanger casting comprising a metal cooling pipe provided with a metal coating layer on the outer surface, which is cast around, and wherein the coating layer comprises: It is composed of Ni and unavoidable impurities and has pores, and the surface of the coating layer and some or all of the pores are coated and filled with chromium oxide.
請求項２に記載の本発明は、金属被覆層を外表面に備え
た金属製冷却管を鋳ぐるんでなる熱交換体鋳物であっ
て、該被覆層が、Crを70wt％以下含有し、残部がNiと不
可避的不純物からなるとともに気孔を有し、該被覆層の
表面及び気孔の一部又は全部が酸化クロムにより被覆か
つ充填されるようにしたものである。The present invention according to claim 2 is a heat-exchanger casting formed by casting a metal cooling pipe provided with a metal coating layer on the outer surface thereof, wherein the coating layer contains 70 wt% or less of Cr, and the balance Is composed of Ni and inevitable impurities and has pores, and the surface of the coating layer and a part or all of the pores are coated and filled with chromium oxide.
請求項３に記載の本発明は、金属被覆層を外表面に備え
た金属製冷却管を鋳ぐるんでなる熱交換体鋳物であっ
て、該被覆層が、Crを70wt％以下含有し、20wt％以下の
Alと2wt％以下のＹの少なくとも一種を含有し、残部がN
iと不可避的不純物からなるとともに気孔を有し、該被
覆層の表面及び気孔の一部又は全部が酸化クロムにより
被覆かつ充填されるようにしたものである。The present invention according to claim 3 is a heat-exchanger casting comprising a metal cooling pipe having a metal coating layer on the outer surface, which is cast, and the coating layer contains 70 wt% or less of Cr, and 20 wt%. %below
Contains Al and at least one of Y of 2 wt% or less, and the balance is N
It is composed of i and unavoidable impurities and has pores, and the surface of the coating layer and some or all of the pores are coated and filled with chromium oxide.
請求項４に記載の本発明は、請求項１〜３のいずれかに
に記載の本発明において更に、前記被覆層の気孔率が、
５〜25％であるようにしたものである。The present invention according to claim 4 is the present invention according to any one of claims 1 to 3, further comprising:
It is set to be 5 to 25%.
請求項５に記載の本発明は、請求項１〜４のいずれかに
記載の本発明において更に、前記被覆層の厚みが、50〜
400μｍであるようにしたものである。The present invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the coating layer has a thickness of 50 to 50.
The thickness is set to 400 μm.
請求項６に記載の本発明は、請求項１〜５のいずれかに
記載の冷却能に優れた熱交換体鋳物の製造方法におい
て、前記酸化クロムの少なくとも一部が、前記被覆層に
含浸せしめた可溶性クロム化合物を酸化雰囲気で熱処理
することにて生成されるものであるようにしたものであ
る。The present invention according to claim 6 is the method for producing a heat exchanger casting excellent in cooling ability according to any one of claims 1 to 5, wherein at least a part of the chromium oxide is impregnated into the coating layer. The soluble chromium compound is produced by heat treatment in an oxidizing atmosphere.
［作用］ 本発明の熱交換体鋳物にあっては、以下の如くの金属被
覆層が形成された冷却管が母材に鋳ぐるまれる。[Operation] In the heat exchanger casting of the present invention, a cooling pipe having a metal coating layer as described below is cast around a base material.
即ち、冷却管は例えば５〜25％の気孔率で気孔を有する
金属被覆層を形成した後、例えば無水クロム酸等の可溶
性クロム化合物の溶液を該被覆層に塗布含浸する。そし
て、該冷却管を酸化雰囲気で熱処理（好ましくは500℃
前後）することにより、塗布含浸したクロム化合物を酸
化クロムに化学変化させる。これにより、該被覆層の表
面及び気孔の少なくとも一部が酸化クロムで被覆かつ充
填される。金属被覆層は、Ni、又はNi−Cr合金、若しく
は必要に応じてAlとＹの少なくとも一種を添加したNi−
Cr合金にて構成される。That is, the cooling pipe forms a metal coating layer having pores with a porosity of, for example, 5 to 25%, and then the coating layer is coated and impregnated with a solution of a soluble chromium compound such as chromic anhydride. Then, the cooling pipe is heat-treated in an oxidizing atmosphere (preferably 500 ° C.
Before and after), the chromium compound coated and impregnated is chemically changed to chromium oxide. Thereby, the surface of the coating layer and at least some of the pores are coated and filled with chromium oxide. The metal coating layer is Ni, or a Ni-Cr alloy, or Ni-containing at least one of Al and Y if necessary.
Composed of Cr alloy.
請求項１〜３に記載の本発明のそれぞれによれば、下記
〜の作用がある。According to each of the present inventions described in claims 1 to 3, there are the following actions.
母材溶湯と冷却管とが直接溶着しないように冷却管に
被覆層を設けるが、この被覆層としては冷却管の伝熱性
を向上させるため、熱伝熱性の良い金属が用いられる。A coating layer is provided on the cooling pipe so that the molten base material and the cooling pipe are not directly welded to each other. As the coating layer, a metal having a good heat transfer property is used to improve the heat transfer property of the cooling pipe.
上記の金属被覆層のみでは冷却管と母材との溶着を
生じてクラックの伝播を防止できない。そこで、金属被
覆層に気孔を形成し、該被覆層の表面及び気孔の少なく
とも一部に酸化クロムを被覆かつ充填する。酸化クロム
は化学的に安定であり溶融母材金属と濡れにくいことか
ら母材と金属被覆層の完全な合金化を防ぎ、母材と冷却
管の強固な溶着が防止され、母材から冷却管へのクラッ
クの伝播を防止できる。Only with the above-mentioned metal coating layer, welding of the cooling pipe and the base material occurs, and it is not possible to prevent the propagation of cracks. Therefore, pores are formed in the metal coating layer, and at least part of the pores and the surface of the coating layer is coated and filled with chromium oxide. Chromium oxide is chemically stable and does not easily get wet with the molten base metal, preventing the complete alloying of the base metal and the metal coating layer, preventing the solid welding of the base metal and the cooling pipe, and preventing the base metal from cooling pipe. It is possible to prevent the propagation of cracks.
同時に、酸化クロムは溶融母材金属と、部分的には軽度
な拡散接合部を形成し、冷却管と母材との伝熱性を向上
せしめる機能をも果たす。At the same time, chromium oxide forms a slight diffusion bonding part with the molten base metal, and also has the function of improving heat transfer between the cooling pipe and the base metal.
金属被覆層の気孔には酸化クロムが充分に充填される
ため、該被覆層の気孔率が軽減し、気孔の存在による被
覆層の保熱効果を低下せしめることとなり、該被覆層の
熱伝導性を向上し、冷却管と母材との伝熱性を向上せし
める。Since the pores of the metal coating layer are sufficiently filled with chromium oxide, the porosity of the coating layer is reduced, and the heat retention effect of the coating layer due to the presence of the pores is reduced, and the thermal conductivity of the coating layer is reduced. To improve the heat transfer between the cooling pipe and the base material.
金属被覆層に形成される酸化クロムの充填気孔は、母
材に発生したクラックの先端応力を分散、解放する作用
をもつ。このため、母材から冷却管へのクラックの伝播
を防止できる。The chromium oxide-filled pores formed in the metal coating layer have the function of dispersing and releasing the tip stress of the crack generated in the base material. Therefore, the propagation of cracks from the base material to the cooling pipe can be prevented.
金属被覆層は、Ni、又はNi−Cr合金、若しくは必要に
応じてAlとＹの少なくとも一種を添加したNi−Cr合金に
て構成され、溶湯鋳込み時の高温と熱衝撃に耐える性能
を備える。The metal coating layer is made of Ni, a Ni-Cr alloy, or a Ni-Cr alloy to which at least one of Al and Y is added if necessary, and has a property of withstanding high temperature and thermal shock during casting of the molten metal.
Niは溶湯となじみ易く、容易に拡散接合層を形成し伝熱
性を向上せしめる。Ni is easily compatible with the molten metal and easily forms a diffusion bonding layer to improve heat transfer.
Crは必要に応じて70wt％まで含有することができ、Crを
含有することにより耐熱性、耐酸化性を向上することが
できる。Crが70wt％を超えると拡散接合層が減少し、か
つ熱衝撃性が低下し、鋳込み時に亀裂や冷却管からの剥
離が生じ易くなるため、Cr含有量は70wt％以下に限定し
た。If necessary, Cr can be contained up to 70 wt%, and by containing Cr, heat resistance and oxidation resistance can be improved. When Cr exceeds 70 wt%, the diffusion bonding layer is reduced and the thermal shock resistance is deteriorated, and cracking and peeling from the cooling pipe are likely to occur during casting, so the Cr content is limited to 70 wt% or less.
又、必要に応じて20wt％以下のAlと2wt％以下のＹの少
なくとも一種を含有することにより、熱処理時に金属被
覆層の表面及び気孔内表面にAl2O3を生成し、酸化クロ
ムの効果を助長することできる。Alが20wt％を超えると
効果が飽和するばかりか合金の融点を低下させ、溶着を
生じ易くするため、20wt％以下に限定した。Ｙは2wt％
を超えて含有しても効果が飽和するとともに、高価とな
るため2wt％以下に限定した。Also, if necessary, at least one of Al of 20 wt% or less and Y of 2 wt% or less is contained, so that Al 2 O 3 is generated on the surface of the metal coating layer and the inner surface of the pores during the heat treatment, and the effect of chromium oxide. Can be promoted. When Al exceeds 20 wt%, the effect is saturated and the melting point of the alloy is lowered, so that welding is likely to occur, so the content is limited to 20 wt% or less. Y is 2 wt%
Even if the content exceeds 5%, the effect is saturated and the cost becomes high, so the content is limited to 2 wt% or less.
請求項４に記載の本発明によれば、下記の作用があ
る。According to the present invention described in claim 4, there is the following action.
金属被覆層が５〜25％の気孔率にて気孔を有するもの
であるから、上記〜の伝熱性向上効果とクラック伝
播防止効果を確保できる。即ち、気孔率が５％未満では
充分なクラック伝播防止効果を得ることができず、25％
より多い場合には充分な伝熱性向上効果を得ることがで
きない。Since the metal coating layer has pores with a porosity of 5 to 25%, it is possible to secure the heat conductivity improving effect and the crack propagation preventing effect as described above. That is, if the porosity is less than 5%, a sufficient crack propagation preventing effect cannot be obtained, and
If the amount is larger than that, a sufficient heat transfer effect cannot be obtained.
請求項５に記載の本発明によれば、下記の作用があ
る。According to the present invention described in claim 5, there is the following action.
金属被覆層が50〜400μｍの厚みを有するものである
から、上記〜の伝熱性向上効果とクラック伝播防止
効果を確保できる。即ち、厚みが50μｍ未満では充分な
クラック伝播防止効果を得ることができず、400μｍを
超えると充分な伝熱性向上効果を得ることができない。Since the metal coating layer has a thickness of 50 to 400 μm, it is possible to secure the heat conductivity improving effect and the crack propagation preventing effect of the above-mentioned items. That is, if the thickness is less than 50 μm, a sufficient crack propagation preventing effect cannot be obtained, and if it exceeds 400 μm, a sufficient heat transfer improving effect cannot be obtained.
請求項６に記載の本発明によれば、下記の作用があ
る。According to the present invention described in claim 6, there is the following action.
金属被覆層の表面及び気孔の少なくとも一部に酸化ク
ロムを被覆かつ充填する方法としては、無水クロム酸や
塩化クロム等の可溶性クロム化合物の溶液を減圧雰囲気
若しくは大気雰囲気で該被覆層に塗布含浸した後、酸化
雰囲気で熱処理することにて、クロム化合物を酸化クロ
ムに化学変化させる方法を採用できる。この方法によれ
ば、金属被覆層の少なくとも一部の表面を酸化クロムの
薄膜で被覆でき、微細気孔にも酸化クロムを充填できる
ため、気孔残留による熱伝導率の低下を防止できる等、
上記〜の伝熱性向上効果とクラック伝播防止効果を
確保できる。As a method of coating and filling chromium oxide on at least a part of the surface and pores of the metal coating layer, a solution of a soluble chromium compound such as chromic anhydride or chromium chloride is applied and impregnated into the coating layer under a reduced pressure atmosphere or an air atmosphere. After that, a method of chemically converting the chromium compound into chromium oxide can be adopted by performing heat treatment in an oxidizing atmosphere. According to this method, at least a part of the surface of the metal coating layer can be coated with a thin film of chromium oxide, and since fine pores can also be filled with chromium oxide, a decrease in thermal conductivity due to residual pores can be prevented, etc.
It is possible to secure the heat transfer improving effect and the crack propagation preventing effect of the above items.
［実施例］ 外径65mmφ、肉厚7.3mmtの高温配管用炭素鋼管（C:0.12
％）を鋳ぐるみ冷却管とする。[Example] Carbon steel pipe (C: 0.12) with an outer diameter of 65 mmφ and a wall thickness of 7.3 mmt for high-temperature piping
%) As a stuffed cooling tube.
本発明例として、上記冷却管の外表面にプラズマ溶射法
により、表１に示す合金を被覆した。この被覆層の表面
及び気孔の一部にクロム酸化溶液をスプレーで塗布含浸
した後、大気中490℃の雰囲気で２時間加熱した。これ
により、溶射被覆層に数十Åの酸化クロムの被膜を形成
し、気孔の60％以上を酸化クロムで充填したことを認め
た。As an example of the present invention, the outer surface of the cooling pipe was coated with the alloy shown in Table 1 by the plasma spraying method. The surface of this coating layer and a part of the pores were coated with a chromium oxide solution by spraying and impregnated, and then heated in the atmosphere at 490 ° C. for 2 hours. As a result, it was confirmed that a coating film of several tens of liters of chromium oxide was formed on the thermal spray coating layer and more than 60% of the pores were filled with chromium oxide.
比較例として、上記冷却管の外表面に、表１に示す被覆
材を厚み0.5mm或いは厚み0.2mm被覆した。As a comparative example, the outer surface of the cooling pipe was coated with the coating material shown in Table 1 in a thickness of 0.5 mm or 0.2 mm.
これら本発明例の被覆層を備えた冷却管と、比較例の被
覆層を備えた冷却管とを、それぞれ鋳込み温度1270℃、
2500kgの球状黒鉛鋳鉄溶湯で鋳ぐるみ、厚み200mmの熱
交換体鋳物を製造した。Cooling pipes provided with a coating layer of these examples of the present invention, and a cooling pipe provided with a coating layer of a comparative example, respectively, casting temperature 1270 ℃,
A heat exchanger casting having a thickness of 200 mm was manufactured by casting a stuffed product with 2500 kg of spheroidal graphite cast iron molten metal.
この熱交換体鋳物から各鋳ぐるみ鋼管１本毎に外径120m
mÅの円筒状試料を切り出し、鋳ぐるみ鋼管の内面を600
℃に加熱保持し、鋳鉄内部の温度分布を測定することに
より伝熱特性を比較した。測温効果に基づき、鋳ぐるみ
鋼管内面から被覆層を介して鋳鉄内部に2.5mm入った位
置までの間の見かけの熱伝導率を計算した。結果を表２
にしめす。比較例Ｄ、Ｅの見かけ熱伝導率に比べ、本発
明のＡ〜Ｃの見かけの熱伝導率は高い値を示しており、
本発明の有効性が明白である。又、いずれの冷却管も鋳
物母材から容易に剥離することができ、クラック伝播に
つながる強固な溶着は認められなかった。Outer diameter of each cast gurney steel pipe from this heat exchanger casting is 120m
Cut out a cylindrical sample of mÅ and make 600
The heat transfer characteristics were compared by heating and holding at ℃ and measuring the temperature distribution inside the cast iron. Based on the temperature measurement effect, the apparent thermal conductivity from the inner surface of the cast steel pipe to the position 2.5 mm inside the cast iron through the coating layer was calculated. The results are shown in Table 2.
Name it. Compared with the apparent thermal conductivity of Comparative Examples D and E, the apparent thermal conductivity of A to C of the present invention shows a high value,
The effectiveness of the present invention is clear. Further, any of the cooling pipes could be easily peeled from the casting base material, and no strong welding leading to crack propagation was observed.
尚、第１図は本発明例Ａの鋳ぐるみ鋼管の断面ミクロ組
織を示す写真である。鋳ぐるみ冷却管１の外表面には被
覆層２が健全なまま保存しており、その外側に母材鋳鉄
３が鋳ぐるまれている。管表面−被覆層−鋳鉄のそれぞ
れの界面には、いずれも軽微な拡散接合が生じており、
優れた密着性を得られることが認められた。Incidentally, FIG. 1 is a photograph showing the cross-sectional microstructure of the cast-gurged steel pipe of Inventive Example A. The coating layer 2 is preserved in good condition on the outer surface of the cast iron cooling pipe 1, and the base material cast iron 3 is cast on the outside thereof. At each interface of pipe surface-coating layer-cast iron, slight diffusion bonding occurs,
It was confirmed that excellent adhesion could be obtained.
［発明の効果］ 本発明によれば、冷却管と母材との伝熱性に優れ、かつ
母材に発生したクラックが冷却管に伝播しない熱交換体
鋳物を得ることができる。従って、ステーブクーラー等
の熱交換体鋳物において、冷却能を向上し、かつ熱亀
裂、折損、溶損、摩耗等を抑制して寿命の延長を達成で
きる。[Effect of the Invention] According to the present invention, it is possible to obtain a heat exchanger casting which is excellent in heat transfer between the cooling pipe and the base material and in which cracks generated in the base material do not propagate to the cooling pipe. Therefore, in a heat exchanger casting such as a stave cooler, it is possible to improve the cooling capacity, suppress thermal cracking, breakage, melting loss, wear, etc., and extend the service life.
第１図は本発明による熱交換体鋳物の金属組織を示す顕
微鏡写真である。FIG. 1 is a photomicrograph showing the metal structure of the heat exchanger casting according to the present invention.
フロントページの続き (72)発明者 片岡 義弘 千葉県千葉市川崎町１番地 川崎製鉄株式 会社技術研究本部内 (72)発明者 黒木 信之 兵庫県神戸市東灘区深江北町４―13―４ トーカロ株式会社内 (56)参考文献 特開 昭62−44567（ＪＰ，Ａ) 特開 昭59−205480（ＪＰ，Ａ)Front Page Continuation (72) Inventor Yoshihiro Kataoka 1 Kawasaki-cho, Chiba-shi, Chiba Inside the Technical Research Headquarters, Kawasaki Steel Co., Ltd. (56) References JP 62-44567 (JP, A) JP 59-205480 (JP, A)
Claims (6)
を鋳ぐるんでなる熱交換体鋳物であって、該被覆層が、
Niと不可避的不純物からなるとともに気孔を有し、該被
覆層の表面及び気孔の一部又は全部が酸化クロムにより
被覆かつ充填されたものである冷却能に優れた熱交換体
鋳物。1. A heat exchanger casting comprising a metal cooling pipe provided with a metal coating layer on its outer surface, the coating layer comprising:
A heat-exchanger casting comprising Ni and unavoidable impurities, having pores, and having the surface and pores partially or wholly covered with chromium oxide and having excellent cooling ability.
を鋳ぐるんでなる熱交換体鋳物であって、該被覆層が、
Crを70wt％以下含有し、残部がNiと不可避的不純物から
なるとともに気孔を有し、該被覆層の表面及び気孔の一
部又は全部が酸化クロムにより被覆かつ充填されたもの
である冷却能に優れた熱交換体鋳物。2. A heat exchanger casting comprising a metal cooling pipe provided with a metal coating layer on its outer surface, the coating layer comprising:
The content of Cr is 70 wt% or less, the balance is Ni and unavoidable impurities and has pores, and the surface of the coating layer and some or all of the pores are coated and filled with chromium oxide to improve the cooling ability. Excellent heat exchanger casting.
を鋳ぐるんでなる熱交換体鋳物であって、該被覆層が、
Crを70wt％以下含有し、20wt％以下のAlと2wt％以下の
Ｙの少なくとも一種を含有し、残部がNiと不可避的不純
物からなるとともに気孔を有し、該被覆層の表面及び気
孔の一部又は全部が酸化クロムにより被覆かつ充填され
たものである冷却能に優れた熱交換体鋳物。3. A heat exchanger casting comprising a metal cooling pipe provided with a metal coating layer on its outer surface, the coating layer comprising:
It contains 70 wt% or less of Cr, 20 wt% or less of Al and 2 wt% or less of at least one kind of Y, and the balance is Ni and unavoidable impurities and has pores. A heat exchanger casting having excellent cooling ability, which is partly or wholly coated and filled with chromium oxide.
求項１〜３のいずれかに記載の冷却能に優れた熱交換体
鋳物。4. The heat exchanger casting with excellent cooling ability according to claim 1, wherein the coating layer has a porosity of 5 to 25%.
請求項１〜４のいずれかに記載の冷却能に優れた熱交換
体鋳物。5. The heat exchanger cast product having excellent cooling ability according to claim 1, wherein the coating layer has a thickness of 50 to 400 μm.
優れた熱交換体鋳物の製造方法において、前記酸化クロ
ムの少なくとも一部が、前記被覆層に含浸せしめた可溶
性クロム化合物を酸化雰囲気で熱処理することにて生成
されるものであることを特徴とする冷却能に優れた熱交
換体鋳物の製造方法。6. The method for producing a heat exchanger casting having excellent cooling ability according to claim 1, wherein at least a part of the chromium oxide is a soluble chromium compound impregnated in the coating layer. A method for producing a heat exchanger casting having excellent cooling ability, which is produced by heat treatment in an oxidizing atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2037291A JPH0771732B2 (en) | 1990-02-20 | 1990-02-20 | Heat exchange casting having excellent cooling ability and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2037291A JPH0771732B2 (en) | 1990-02-20 | 1990-02-20 | Heat exchange casting having excellent cooling ability and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03243267A JPH03243267A (en) | 1991-10-30 |
| JPH0771732B2 true JPH0771732B2 (en) | 1995-08-02 |
Family
ID=12493607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2037291A Expired - Fee Related JPH0771732B2 (en) | 1990-02-20 | 1990-02-20 | Heat exchange casting having excellent cooling ability and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0771732B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59205480A (en) * | 1983-05-09 | 1984-11-21 | Usui Internatl Ind Co Ltd | Method for reinforcing ceramic plasma spraying coating layer for heat insulating engine parts |
| JPS6244567A (en) * | 1985-08-22 | 1987-02-26 | Kobe Steel Ltd | Manufacture of aluminum alloy casting for heat exchanger |
-
1990
- 1990-02-20 JP JP2037291A patent/JPH0771732B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03243267A (en) | 1991-10-30 |
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