JPH0771731B2 - 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
- JPH0771731B2 JPH0771731B2 JP2037290A JP3729090A JPH0771731B2 JP H0771731 B2 JPH0771731 B2 JP H0771731B2 JP 2037290 A JP2037290 A JP 2037290A JP 3729090 A JP3729090 A JP 3729090A JP H0771731 B2 JPH0771731 B2 JP H0771731B2
- Authority
- JP
- Japan
- Prior art keywords
- coating layer
- cooling pipe
- casting
- heat exchanger
- base material
- 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.)
- Expired - Fee Related
Links
- 238000001816 cooling Methods 0.000 title claims description 49
- 238000005266 casting Methods 0.000 title claims description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000011247 coating layer Substances 0.000 claims description 38
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 239000011148 porous material Substances 0.000 claims description 17
- 229910000423 chromium oxide Inorganic materials 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 150000001845 chromium compounds Chemical class 0.000 claims description 5
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 30
- 239000010953 base metal Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000003405 preventing effect Effects 0.000 description 6
- 229910001208 Crucible steel Inorganic materials 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910017318 Mo—Ni Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000004227 thermal cracking Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910021555 Chromium Chloride Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- QSWDMMVNRMROPK-UHFFFAOYSA-K chromium(3+) trichloride Chemical compound [Cl-].[Cl-].[Cl-].[Cr+3] QSWDMMVNRMROPK-UHFFFAOYSA-K 0.000 description 1
- UOUJSJZBMCDAEU-UHFFFAOYSA-N chromium(3+);oxygen(2-) Chemical group [O-2].[O-2].[O-2].[Cr+3].[Cr+3] UOUJSJZBMCDAEU-UHFFFAOYSA-N 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010285 flame spraying Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- 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せて好適
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。Description: 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（１）、（２）の問題点
がある。[Problems to be Solved by the Invention] However, the prior art has the following problems (1) and (2).
（１）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。(1) Since the refractory layer having a low thermal conductivity is provided on the surface of the pipe or the voids are provided, the 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.
（２）母材として鋳鋼を選択し、管表面を耐火物で被覆
するものにあっては、被覆層が反応溶融する傾向が強
く、冷却管と母材とが部分的に溶着する。このことは、
母材に発生したクラックが冷却管に進展することを防止
できず、前述の（Ｂ）の性能を全うできないことを意味
する。(2) In the case where cast steel is selected as the base material and the pipe surface is coated with a refractory material, the coating layer has a strong tendency to react and melt, and the cooling pipe and the base material are partially welded. This is
It means that the crack generated in the base material cannot be prevented from propagating to the cooling pipe, and the performance of the above (B) cannot be fulfilled.
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Mo、又はNiを50wt％以下含有し残部がMo
と不可避的不純物からなる合金のいずれかからなるとと
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 surrounded by Mo. , Or 50% by weight or less of Ni with the balance Mo
And an alloy containing unavoidable impurities and having pores, and the surface of the coating layer and part or all of the pores are coated and filled with chromium oxide.
請求項２に記載の本発明は、請求項１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。According to a second aspect of the present invention, in addition to the first aspect of the present invention, the coating layer has a porosity of 5 to 25%.
請求項３に記載の本発明は、請求項１又は２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。According to a third aspect of the present invention, in the method for producing a heat exchanger casting having excellent cooling ability according to the first or second aspect, at least a part of the chromium oxide is soluble chromium in which the coating layer is impregnated. The compound is produced by heat-treating the compound 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、例えばMo、Mo−Ni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。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 made of, for example, Mo or Mo-Ni alloy, and has a property of withstanding high temperature and thermal shock during molten metal casting.
請求項１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 1, 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
を向上するため、熱伝導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 good thermal conductivity is used in order to improve heat transfer 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、融点が高く、熱伝導率（0.34Cal/sec.
cm.℃）が高いMo、若しくはMo−Ni合金にて構成した。
これにより、溶融母材の鋳込み時の高温と熱衝撃に耐え
得る被覆層を形成できる。The metal coating layer has a high melting point and thermal conductivity (0.34 Cal / sec.
It is composed of Mo or Mo-Ni alloy having a high cm.
This makes it possible to form a coating layer that can withstand the high temperature and thermal shock during casting of the molten base material.
Moは耐熱性に優れ、鋳鋼等の母材鋳込み時の高温に耐え
得る。又、Moは酸化し易いため、鋳ぐるまれる時に酸化
被膜を形成し、溶融母材との直接接触が防止される。従
って、鋳込み母材が鋳鋼等である場合にも、被覆層の反
応溶融を回避し、冷却管と母材との部分的な融着を防止
し、母材に発生したクラックが冷却管に浸填することを
防止できる。Mo has excellent heat resistance and can withstand high temperatures during casting of base materials such as cast steel. Further, since Mo easily oxidizes, it forms an oxide film when it is cast and thus prevents direct contact with the molten base material. Therefore, even when the cast base material is cast steel or the like, reaction melting of the coating layer is avoided, partial fusion between the cooling pipe and the base material is prevented, and cracks generated in the base material penetrate into the cooling pipe. It is possible to prevent filling.
Niは、必要に応じて50wt％まで含有することができ、耐
熱衝撃性及び耐酸化性を向上し、鋳込み時における亀裂
や冷却管からの剥離を抑制する。Niが50wt％を超える
と、該金属被覆層の融点が低下して鋳鋼等の母材鋳込み
温度に近くなって母材と溶融溶着する可能性があるた
め、Ni含有量は50wt％以下に限定した。Ni can be contained in an amount of up to 50 wt% as needed, improves thermal shock resistance and oxidation resistance, and suppresses cracks during casting and peeling from the cooling pipe. If the Ni content exceeds 50 wt%, the melting point of the metal coating layer may decrease, and the temperature may approach the base material casting temperature of cast steel or the like, causing fusion welding with the base material, so the Ni content is limited to 50 wt% or less. did.
請求項２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 2, the following effects are obtained.
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３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 3, 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27mmφ、肉厚3.5mmt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 for high-temperature piping with an outer diameter of 27 mmφ and a wall thickness of 3.5 mmt (C: 0.12
%) 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水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. A chromic acid aqueous solution was applied by spraying to the surface of the coating layer and a part of the pores, and then impregnated, followed by heating in an atmosphere of 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
材を被覆した。As a comparative example, the coating material shown in Table 1 was coated on the outer surface of the cooling pipe.
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100kgの耐熱鋳鋼溶
湯で鋳ぐるみ、厚み150mmの熱交換体鋳物を製造した。Each of the cooling pipe having the coating layer of the present invention example and the cooling pipe having the coating layer of the comparative example was casted with 100 kg of molten heat-resistant cast steel to produce a heat exchange casting having a thickness of 150 mm.
この熱交換体鋳物を切断し、切断部の内部から鋳ぐるみ
冷却管を剥離し、母材との溶着面積を調査した。結果を
表２に示す。表２によれば、本発明例にあっては、母材
と冷却管との間で全く溶着を生じておらず、本発明の有
効性が認められた。The heat exchanger castings were cut, the stuffed body cooling pipe was peeled from the inside of the cut portion, and the welding area with the base material was investigated. The results are shown in Table 2. According to Table 2, in the examples of the present invention, welding was not generated at all between the base material and the cooling pipe, and the effectiveness of the present invention was confirmed.
［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.
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 (3)
を鋳ぐるんでなる熱交換体鋳物であって、該被覆層がM
o、又はNiを50wt％以下含有し残部がMoと不可避的不純
物からなる合金のいずれかからなるとともに、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 M
o or an alloy containing 50 wt% or less of Ni with the balance being Mo and inevitable impurities, and having pores, and the surface of the coating layer and part or all of the pores are coated with chromium oxide and A heat exchanger casting that is filled and has excellent cooling capacity.
求項１に記載の冷却能に優れた熱交換体鋳物。2. The heat exchanger casting with excellent cooling ability according to claim 1, wherein the coating layer has a porosity of 5 to 25%.
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。3. The method for producing a heat exchanger casting with 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 in an oxidizing atmosphere. A method for producing a heat exchanger casting having excellent cooling ability, which is produced by heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2037290A JPH0771731B2 (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 |
|---|---|---|---|
| JP2037290A JPH0771731B2 (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 |
|---|---|
| JPH03243266A JPH03243266A (en) | 1991-10-30 |
| JPH0771731B2 true JPH0771731B2 (en) | 1995-08-02 |
Family
ID=12493580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2037290A Expired - Fee Related JPH0771731B2 (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) | JPH0771731B2 (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 JP2037290A patent/JPH0771731B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03243266A (en) | 1991-10-30 |
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