JP2002030375A - Cobalt alloy, pipe using the same and method for producing the same alloy - Google Patents
Cobalt alloy, pipe using the same and method for producing the same alloyInfo
- Publication number
- JP2002030375A JP2002030375A JP2000218699A JP2000218699A JP2002030375A JP 2002030375 A JP2002030375 A JP 2002030375A JP 2000218699 A JP2000218699 A JP 2000218699A JP 2000218699 A JP2000218699 A JP 2000218699A JP 2002030375 A JP2002030375 A JP 2002030375A
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- alloy
- cobalt alloy
- resistance
- hardness
- weight
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、耐摩耗性、耐熱性
が要求される用途に使用するコバルト合金及びそれを用
いるパイプ及びその合金の製造方法に関する。The present invention relates to a cobalt alloy used for applications requiring wear resistance and heat resistance, a pipe using the same, and a method for producing the alloy.
【０００２】[0002]
【従来の技術】従来から輸送用パイプ等耐熱、耐摩耗の
用途に利用される合金には、ダイス鋼、鋳造ステライト
等があった。しかし、これらは硬さが不十分であった
り、耐熱性が不十分であったり、形状自由度が小さいな
どの欠点があった。これらを改善するため、コバルト合
金が開発されたが、硬さがＨｖ７００以下もしくはＨｖ
１０００以上の合金であった。前者は硬度が足りず耐摩
耗性に問題があった。後者は硬度は十分であるが、靭性
が不足し欠損し易い欠点があった。更に、パイプ輸送す
るものが石炭灰、砂、石炭、コークスなどの硬さがＨｖ
100以上でかつ粒径が１０μ以上の粒状物であり、その
温度が室温から１０００℃の高温であるようなものに適
した耐摩耗パイプはなかった。2. Description of the Related Art Conventionally, die steel, cast stellite, and the like have been used as alloys used for heat and wear resistance such as transportation pipes. However, they have disadvantages such as insufficient hardness, insufficient heat resistance, and a small degree of freedom in shape. To improve these, a cobalt alloy was developed, but the hardness was less than Hv700 or Hv.
More than 1000 alloys. The former had insufficient hardness and had a problem in wear resistance. The latter has a sufficient hardness, but has a drawback that the toughness is insufficient and the chip is easily broken. Furthermore, the hardness of coal ash, sand, coal, coke, etc. is Hv
There was no abrasion-resistant pipe suitable for particles having a particle size of 100 or more and a particle size of 10 μ or more and having a temperature from room temperature to a high temperature of 1000 ° C.
【０００３】[0003]
【発明が解決しようとする課題】本発明は硬さ、靭性、
耐熱性、耐摩耗性、耐衝撃性を兼ね備えたコバルト合金
及びそのコバルト合金よりなるパイプ及びそのコバルト
合金を製造する方法を得ることを目的とする。特にパイ
プについては石炭火力発電所の燃焼灰輸送ラインや流動
床炉の砂循環等高温で使用でき、しかも直線部のみなら
ず湾曲部でも使え、粒状物が高硬度でも使える長寿命の
パイプを得ることを目的とする。SUMMARY OF THE INVENTION The present invention relates to hardness, toughness,
An object of the present invention is to provide a cobalt alloy having heat resistance, wear resistance, and impact resistance, a pipe made of the cobalt alloy, and a method of manufacturing the cobalt alloy. In particular, pipes can be used at high temperatures such as the combustion ash transport line of coal-fired power plants and sand circulation in fluidized bed furnaces, and can be used not only in straight sections but also in curved sections, and obtain long-life pipes that can be used even with high hardness of granular materials. The purpose is to:
【０００４】[0004]
【課題を解決するための手段】本発明は、硬さ、靭性、
耐熱性、耐摩耗性、耐衝撃性を兼ね備えたコバルト合金
を得るため合金組成をＣｏ−Ｍ６Ｃ−ＭｘＣｙ（ここ
で、Ｘ、Ｙは自然数、ＭはＣｏＣｒＷである）とするこ
とを特徴とする。又、本発明の実施にあたり、化学的安
定性が大きいように（Ｘ、Ｙ）を（７、3）、（２３、
６）の少なくとも１の形態をとることが好適である。砂
等の粒状物に対する耐摩耗性があり靭性を持たせるため
に粒径が３〜５μｍであり、硬さがＨｖで７００〜９０
０となるようにした。本発明のコバルト合金において、
砂等の粒状物に対する耐摩耗性があり靭性を持たせるた
めに粒径が３μｍより小さいと合金中に占める粒界の割
合が大きくなり、粒界腐食や粒界の結合強度が粒内原子
間結合強度より小さいので摩耗しやすくなる。また粒径
を５μｍより大きくすると、衝撃による粒内破壊が起こ
りやすくなり、材料の欠損や摩耗が起こりやすくなるの
で、粒径としては３〜５μｍとすることが好ましい。耐
食性を向上させるため、本発明のコバルト合金のＣｏの
１０〜２０重量％をＮｉで置換した組成にすると好適で
ある。前記いずれかに記載の本発明のコバルト合金で作
ったパイプは硬さ、靭性、耐熱性、耐摩耗性、耐衝撃性
を兼ね備えているので石炭火力発電所の燃焼灰輸送ライ
ンや流動床炉の砂循環等高温で使用でき、しかも直線部
のみならず湾曲部でも、粒状物が高硬度であっても使用
でき長寿命となる。Ｃｏ粉末を３５〜４５重量％、Ｃｒ
粉末を５〜２０重量％、Ｃｒ3Ｃ2粉末を２０〜３５重量
％、Ｗを１５〜３５重量％混合しプレス等の成形後、１
１５０〜１２００℃で焼結すると本発明のコバルト合金
Ｃｏ−Ｍ６Ｃ−ＭｘＣｙ（Ｘ、Ｙは自然数、ＭはＣｏＣ
ｒＷ）を得ることができる。本発明のコバルト合金のう
ちＣｏの１０〜２０重量％をＮｉで置換したものを得る
ためには、前記製法においてＣｏの１０〜２０重量％を
Ｎｉで置換して用いればよい。また本発明のコバルト合
金は、硬さがＨｖで７００〜９００なので耐摩耗性があ
る上、靭性も有る。本発明のコバルト合金中のＣｏを１
０〜２０重量％Ｎｉで置換すると耐食性が向上するが、
Ｎｉが１０重量％より小さいと耐食性は向上しない、ま
た２０重量％より大きくなると耐熱性が得られないので
耐食性を向上させるためにＮｉに置換するＣｏの量とし
ては、１０〜２０重量％が望ましい。石炭灰、砂、石
炭、コークスなどの硬さがHv100以上でかつ粒径が１０
μ以上の粒状物を運ぶパイプと合金で作ったことを特徴
とする耐摩耗パイプで、粒状物がであり、その温度が室
温から１０００℃の高温であることを特徴とする耐摩耗
パイプであること。SUMMARY OF THE INVENTION The present invention provides hardness, toughness,
In order to obtain a cobalt alloy having both heat resistance, wear resistance and impact resistance, the alloy composition is characterized by being Co-M6C-MxCy (where X and Y are natural numbers and M is CoCrW). In the practice of the present invention, (X, Y) is changed to (7, 3), (23,
It is preferable to adopt at least one form of 6). The particles have a particle size of 3 to 5 μm and a hardness of 700 to 90 in terms of Hv in order to provide abrasion resistance and toughness to particulates such as sand.
It was set to 0. In the cobalt alloy of the present invention,
When the grain size is less than 3 μm, the proportion of the grain boundaries in the alloy becomes large when the grain size is smaller than 3 μm in order to impart toughness such as sand to the abrasion resistance and the toughness. Since it is smaller than the bonding strength, it is easy to wear. When the particle size is larger than 5 μm, intragranular fracture due to impact is likely to occur, and material loss or wear is likely to occur. Therefore, the particle size is preferably 3 to 5 μm. In order to improve the corrosion resistance, it is preferable that the cobalt alloy of the present invention has a composition in which 10 to 20% by weight of Co is replaced with Ni. The pipe made of the cobalt alloy of the present invention according to any of the above has both hardness, toughness, heat resistance, wear resistance, and impact resistance, so that it can be used in a combustion ash transport line of a coal-fired power plant or a fluidized bed furnace. It can be used at high temperatures such as sand circulation, and can be used not only in a straight part but also in a curved part, even if the granular material has high hardness, and the life is long. 35 to 45% by weight of Co powder, Cr
Powder 5-20 wt%, Cr 3 C 2 powder 20 to 35 wt%, after formation of the press or the like by mixing W 15 to 35 wt%, 1
When sintered at 150 to 1200 ° C, the cobalt alloy of the present invention, Co-M6C-MxCy (X and Y are natural numbers, M is CoC
rW) can be obtained. In order to obtain the cobalt alloy of the present invention in which 10 to 20% by weight of Co is replaced with Ni, it is only necessary to replace 10 to 20% by weight of Co with Ni in the above-mentioned method. Further, the hardness of the cobalt alloy of the present invention is 700 to 900 in terms of Hv, so that the cobalt alloy has not only wear resistance but also toughness. Co in the cobalt alloy of the present invention is 1
Corrosion resistance is improved by substituting with 0 to 20% by weight of Ni,
If Ni is less than 10% by weight, the corrosion resistance is not improved, and if it is more than 20% by weight, heat resistance cannot be obtained. Therefore, the amount of Co substituted by Ni for improving the corrosion resistance is preferably 10 to 20% by weight. . Hardness of coal ash, sand, coal, coke etc. is Hv100 or more and particle size is 10
An abrasion-resistant pipe characterized by being made of an alloy with a pipe that carries a particulate matter of μ or more, wherein the particulate matter is at a high temperature of from room temperature to 1000 ° C. thing.
【０００５】[0005]
【発明の実施の形態】請求項１記載の発明は、合金組成
がＣｏ−Ｍ６Ｃ−ＭｘＣｙ（Ｘ、Ｙは自然数、ＭはＣｏ
ＣｒＷ）であることを特徴とするコバルト合金であり硬
さ、靭性、耐熱性、耐摩耗性、耐衝撃性を兼ね備えてい
る。請求項２記載の発明は、合金組成がＣｏ−Ｍ６Ｃ−
ＭｘＣｙ（Ｘ、Ｙは自然数、ＭはＣｏＣｒＷ）であるこ
とを特徴とする本発明のコバルト合金において（Ｘ、
Ｙ）が（７、3）、（２３、６）の少なくとも１の形態
をとる組成からなるが、他のコバルト合金と比較すると
化学的に安定で耐食性がある。請求項３記載の発明は、
合金組成がＣｏ−Ｍ６Ｃ−ＭｘＣｙ（Ｘ、Ｙは自然数、
ＭはＣｏＣｒＷ）であることを特徴とするコバルト合金
の粒径が３〜５μｍであり、硬さがＨｖで７００〜９０
０であるので、砂等の粒状物に対して耐摩耗性があり靭
性がある。粒径が３μｍより小さいと合金中に占める粒
界の割合が大きくなり、粒界腐食や粒界の結合強度が粒
内原子間結合強度より小さいので摩耗しやすくなる。ま
た粒径を５μｍより大きくすると、衝撃による粒内破壊
が起こりやすくなり、材料の欠損や摩耗が起こりやすく
なるので、粒径としては３〜５μｍとする。請求項４記
載の発明は、合金組成がＣｏ−Ｍ６Ｃ−ＭｘＣｙ（Ｘ、
Ｙは自然数、ＭはＣｏＣｒＷ）であることを特徴とする
コバルト合金のＣｏの１０〜２０重量％をＮｉで置換す
ると耐食性が向上する。請求項５記載の発明は、合金組
成がＣｏ−Ｍ６Ｃ−ＭｘＣｙ（Ｘ、Ｙは自然数、ＭはＣ
ｏＣｒＷ）であることを特徴とするコバルト合金、前記
合金の（Ｘ、Ｙ）が（７、3）、（２３、６）の少なく
とも１であるコバルト合金、前２合金の粒径が３〜５μ
ｍであり、硬さがＨｖで７００〜９００であるコバルト
合金又は前３合金のＣｏの１０〜２０重量％をＮｉで置
換するコバルト合金からなるパイプであるが、硬さ、靭
性、耐熱性、耐摩耗性、耐衝撃性を兼ね備えているので
石炭火力発電所の燃焼灰輸送ラインや流動床炉の砂循環
等高温で使用でき、しかも直線部のみならず湾曲部で
も、粒状物が高硬度であっても使用でき長寿命となる。
請求項６記載の発明は、Ｃｏを３５〜４５重量％、Ｃｒ
を５〜２０重量％、Ｃｒ３Ｃ２を２０〜３５重量％、Ｗ
を１５〜３５重量％混合し成形後、１１５０〜１２００
℃で焼結することを特徴とするコバルト合金Ｃｏ−Ｍ６
Ｃ−ＭｘＣｙ（Ｘ、Ｙは自然数、ＭはＣｏＣｒＷ）の製
造方法である。請求項７記載の発明は、本発明のコバル
ト合金のうち合金組成がＣｏ−Ｍ６Ｃ−ＭｘＣｙ（Ｘ、
Ｙは自然数、ＭはＣｏＣｒＷ）のコバルト合金のＣｏの
１０〜２０重量％をＮｉで置換したものを得るために、
Ｃｏを３５〜４５重量％、Ｃｒを５〜２０重量％、Ｃｒ
３Ｃ２を２０〜３５重量％、Ｗを１５〜３５重量％混合
し成形後、１１５０〜１２００℃で焼結することを特徴
とするコバルト合金Ｃｏ−Ｍ６Ｃ−ＭｘＣｙ（Ｘ、Ｙは
自然数、ＭはＣｏＣｒＷ）の製造方法でにおいてＣｏの
１０〜２０重量％をＮｉで置換して用いるものである。
本発明の焼結合金の実施例を表１に示す。以下、実施例
により本発明を詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 is characterized in that the alloy composition is Co-M6C-MxCy (X and Y are natural numbers and M is Co
CrW) is a cobalt alloy characterized by having hardness, toughness, heat resistance, abrasion resistance and impact resistance. The invention according to claim 2 is characterized in that the alloy composition is Co-M6C-
MxCy (X and Y are natural numbers, M is CoCrW).
Y) has a composition that takes at least one form of (7, 3) and (23, 6), but is chemically stable and has corrosion resistance as compared with other cobalt alloys. The invention according to claim 3 is
The alloy composition is Co-M6C-MxCy (X and Y are natural numbers,
M is CoCrW), wherein the cobalt alloy has a particle size of 3 to 5 μm and a hardness of 700 to 90 in Hv.
Since it is 0, it has abrasion resistance and toughness against particulate matter such as sand. If the particle size is smaller than 3 μm, the proportion of the grain boundary in the alloy becomes large, and the grain boundary corrosion and the bond strength of the grain boundary are smaller than the bond strength between atoms in the alloy, so that the alloy is easily worn. When the particle size is larger than 5 μm, intragranular fracture due to impact is likely to occur, and material loss or wear is likely to occur. Therefore, the particle size is set to 3 to 5 μm. In the invention according to claim 4, the alloy composition is Co-M6C-MxCy (X,
When Y is a natural number and M is CoCrW), the corrosion resistance is improved by replacing 10 to 20% by weight of Co of the cobalt alloy with Ni. The invention according to claim 5 is that the alloy composition is Co-M6C-MxCy (X and Y are natural numbers, and M is C
oCrW), a cobalt alloy wherein (X, Y) of the alloy is at least one of (7, 3) and (23, 6), and a particle diameter of the former two alloys of 3 to 5 μm.
m, and a pipe made of a cobalt alloy having a hardness of 700 to 900 in Hv or a cobalt alloy in which 10 to 20% by weight of Co of the preceding three alloys is replaced with Ni. However, hardness, toughness, heat resistance, Since it has both abrasion resistance and impact resistance, it can be used at high temperatures such as combustion ash transport lines of coal-fired power plants and sand circulation of fluidized bed furnaces. Even if there is, it can be used and has a long life.
According to a sixth aspect of the present invention, there is provided the method according to claim 6, wherein the content of Co is 35 to 45% by weight,
5 to 20% by weight, Cr3C2 20 to 35% by weight, W
Is mixed at 15 to 35% by weight, and after molding, 1150 to 1200
Co-M6, characterized by sintering at ℃
This is a method for producing C-MxCy (X and Y are natural numbers and M is CoCrW). The invention according to claim 7 is the cobalt alloy of the present invention, wherein the alloy composition is Co-M6C-MxCy (X,
Y is a natural number, and M is a cobalt alloy of CoCrW) in which 10 to 20% by weight of Co is replaced with Ni.
35 to 45% by weight of Co, 5 to 20% by weight of Cr, Cr
Cobalt alloy Co-M6C-MxCy (X and Y are natural numbers, M is CoCrW) characterized in that 3C2 is mixed at 20 to 35% by weight and W is mixed at 15 to 35% by weight and then sintered at 1150 to 1200 ° C. ), Wherein 10 to 20% by weight of Co is replaced with Ni.
Table 1 shows examples of the sintered alloy of the present invention. Hereinafter, the present invention will be described in detail with reference to examples.
【０００６】[0006]
【実施例】表１に示すような、本発明のコバルト合金
（例１〜５）と従来のコバルト合金（比較１、２）とを
用いて物性試験用試料、直管パイプ（外径５００ｍｍ、
内径４４０ｍｍ、長さ１００００ｍｍ）及びＬ字パイプ
（外径５８５ｍｍ、内径５００ｍｍ、長さ１５００ｍ
ｍ）を作成し、硬さ、強度、耐熱性、耐摩耗性、耐衝撃
性について比較した。本発明のコバルト合金１〜５は、
Ｃｏ粉末を３５〜４５重量％、Ｃｒ粉末を５〜２０重量
％、Ｃｒ３Ｃ２粉末を２０〜３５重量％、Ｗ粉末を１５
〜３５重量％、一部のものはＣｏの１０〜２０重量％を
Ｎｉで置換し混合し成形後、１１５０〜１２００℃で焼
結して本発明のコバルト合金Ｃｏ−Ｍ６Ｃ−ＭｘＣｙ
（Ｘ、Ｙは自然数、ＭはＣｏＣｒＷ）を製造した。従来
のコバルト合金（比較１、２）は市販のものを用いた。
耐熱性、耐摩耗性、耐衝撃性の評価は、１０００℃以上
に加熱された粒径が１ｍｍ以上の砂を上記パイプ及びＬ
字パイプで砂を圧送するプラントの配管に接続して２０
００時間連続して圧送することにより判定した。本発明
のコバルト合金（例１〜５）および従来のコバルト合金
（比較１、２）は、耐酸化性について問題はなかった。
本発明のコバルト合金（例１〜５）は、硬さ、曲げ強度
も十分で砂のような固形物の圧送の用途にも摩耗も少な
く、亀裂等の破損もみられず耐摩耗性、耐衝撃性を有し
ていることがわかった。これに対して、従来のコバルト
合金（比較１、２）は、それぞれ硬さ又は曲げ強度が十
分でなく、砂のような固形物の圧送の用途に対してはそ
れぞれ摩耗が激しくＬ字パイプの曲部で孔が空いたり、
亀裂が発生したりして耐摩耗性又は耐衝撃性が十分でな
いことがわかった。本発明のコバルト合金が、硬さ、強
度、耐酸化性、耐摩耗性、耐衝撃性のそれぞれについて
優れていることがわかった。又、Ｃｏの一部をＮｉで置
換した例２の本発明のコバルト合金は、他の本発明のコ
バルト合金より腐食が少なかった。詳細な実験の結果、
耐食性を向上させるためには本発明のコバルト合金のＣ
ｏの１０〜２０重量％をＮｉで置換した組成にすると好
適であることがわかった。また本発明のコバルト合金の
中、（Ｘ、Ｙ）を（７、3）、（２３、６）少なくとも
１の形態をとるものは、特に酸を含んだ砂を圧送する状
況で使用しても、腐食が少なく化学的安定性が大きかっ
た。本発明のコバルト合金は、粒径が３〜５μｍであ
り、硬さがＨｖで７００〜９００となるようにしたが、
粒径を３μｍより小さくしたものは合金中に占める粒界
の割合が大きくなり、粒界腐食や粒界の結合強度が粒内
原子間結合強度より小さいので摩耗しやすくなり、粒径
を５μｍより大きくすると、衝撃による粒内破壊が起こ
りやすくなり、材料の欠損や摩耗が起こりやすくなるの
で、砂等の粒状物に対する耐摩耗性があり靭性を持たせ
るためにまた粒径としては３〜５μｍとすることが好ま
しいことがわかった。EXAMPLES As shown in Table 1, using a cobalt alloy of the present invention (Examples 1 to 5) and a conventional cobalt alloy (Comparative Examples 1 and 2), a sample for a physical property test, a straight pipe (outer diameter 500 mm,
Inside diameter 440mm, length 10000mm) and L-shaped pipe (outside diameter 585mm, inside diameter 500mm, length 1500m)
m) were prepared and compared for hardness, strength, heat resistance, abrasion resistance and impact resistance. The cobalt alloys 1 to 5 of the present invention are:
35 to 45 wt% Co powder, 5 to 20 wt% Cr powder, 20 to 35 wt% Cr3C2 powder, 15 W powder
35 to 35% by weight, and in some cases, 10 to 20% by weight of Co is replaced with Ni, mixed, molded, sintered at 1150 to 1200 ° C. and cobalt alloy Co-M6C-MxCy of the present invention.
(X and Y are natural numbers and M is CoCrW). Conventional cobalt alloys (comparative 1 and 2) were commercially available.
The heat resistance, abrasion resistance, and impact resistance were evaluated by using sand heated to 1000 ° C. or more and having a particle size of 1 mm or more as described above for the pipe and L.
Connected to the piping of a plant that pumps sand with a U-shaped pipe.
Judgment was made by feeding continuously for 00 hours. The cobalt alloys of the present invention (Examples 1 to 5) and the conventional cobalt alloys (Comparative Examples 1 and 2) had no problem with respect to oxidation resistance.
The cobalt alloy (Examples 1 to 5) of the present invention has sufficient hardness and bending strength, and has little abrasion even in applications of pumping solids such as sand. It was found to have the property. On the other hand, the conventional cobalt alloys (Comparative 1 and 2) do not have sufficient hardness or bending strength, respectively, and are hard to wear for pumping solids such as sand. There is a hole in the bend,
It was found that abrasion resistance or impact resistance was not sufficient due to cracks or the like. The cobalt alloy of the present invention was found to be excellent in hardness, strength, oxidation resistance, wear resistance, and impact resistance. Further, the cobalt alloy of the present invention of Example 2 in which part of Co was replaced with Ni showed less corrosion than the other cobalt alloys of the present invention. As a result of detailed experiments,
In order to improve the corrosion resistance, the cobalt alloy according to the present invention must have a C content.
It has been found that a composition in which 10 to 20% by weight of o is replaced with Ni is preferable. Further, among the cobalt alloys of the present invention, those in which (X, Y) takes at least one form of (7, 3) and (23, 6) can be used particularly in a situation where sand containing acid is pumped. Low corrosion and high chemical stability. The cobalt alloy of the present invention has a particle size of 3 to 5 μm and a hardness of 700 to 900 in Hv.
When the grain size is smaller than 3 μm, the proportion of the grain boundaries in the alloy increases, and the grain boundary corrosion and the bond strength of the grain boundaries are smaller than the interatomic bond strength between the grains, so that the alloy tends to wear, and the grain size becomes smaller than 5 μm. If the size is large, intragranular fracture due to impact is likely to occur, and material loss and wear are likely to occur. Therefore, in order to have abrasion resistance to toughness such as sand and to have toughness, the particle size is 3 to 5 μm. Has been found to be preferable.
【０００７】[0007]
【表１】 [Table 1]
【０００８】[0008]
【発明の効果】本発明のコバルト合金は、硬さがＨｖ７
００〜９００であり、強度が１．２〜１．５ＧＰである
ので、硬さ、靭性、耐熱性、耐摩耗性、耐衝撃性を兼ね
備えており、従来のコバルト合金で使用できなかった耐
摩耗性、耐熱性、耐衝撃性が要求される用途に使用でき
る。本発明のコバルト合金パイプは、高温で、しかも直
線部のみならず湾曲部でも使用でき、粒状物が高硬度で
も摩耗しにくく衝撃により欠損しにくく長寿命である。
特に石炭火力発電所の燃焼灰輸送ラインや流動床炉の砂
循環などの高温条件で使われるパイプに適する。The hardness of the cobalt alloy of the present invention is Hv7.
100 to 900, and the strength is 1.2 to 1.5 GP. Therefore, it has hardness, toughness, heat resistance, wear resistance, and impact resistance. It can be used for applications requiring heat resistance, heat resistance and impact resistance. INDUSTRIAL APPLICABILITY The cobalt alloy pipe of the present invention can be used at a high temperature and not only in a straight part but also in a curved part.
In particular, it is suitable for pipes used under high-temperature conditions such as the combustion ash transport line of coal-fired power plants and the sand circulation of fluidized bed furnaces.
Claims (7)
ことを特徴とするコバルト合金。ここで、Ｘ、Ｙは自然
数、ＭはＣｏＣｒＷである。1. A cobalt alloy having an alloy composition of Co-M6C-MxCy. Here, X and Y are natural numbers, and M is CoCrW.
３、６）の１種以上であることを特徴とする請求項１記
載のコバルト合金。2. The method according to claim 1, wherein (X, Y) is at least (7, 3), (2)
The cobalt alloy according to claim 1, wherein the cobalt alloy is at least one of the following:
００〜９００であることを特徴とする請求項１又は請求
項２記載のコバルト合金。3. The particle size is 3 to 5 μm and the hardness is 7 in Hv.
The cobalt alloy according to claim 1 or 2, wherein the number is from 00 to 900.
ことを特徴とする請求項１から請求項３のいずれかに記
載のコバルト合金。4. The cobalt alloy according to claim 1, wherein 10 to 20% by weight of Co is replaced with Ni.
コバルト合金で作ったことを特徴とするパイプ。5. A pipe made of the cobalt alloy according to any one of claims 1 to 4.
重量％、Ｃｒ３Ｃ２を２０〜３５重量％、Ｗを１５〜３
５重量％混合し成形後、１１５０〜１２００℃で焼結す
ることを特徴とするコバルト合金Ｃｏ−Ｍ６Ｃ−ＭｘＣ
ｙ（Ｘ、Ｙは自然数、ＭはＣｏＣｒＷ）の製造方法。6. Co is 35 to 45% by weight and Cr is 5 to 20% by weight.
% By weight, 20 to 35% by weight of Cr3C2, and 15 to 3% of W
Cobalt alloy Co-M6C-MxC characterized by mixing at 5% by weight and sintering at 1150 to 1200 ° C after molding.
A method for producing y (X and Y are natural numbers and M is CoCrW).
ことを特徴とする請求項６に記載のコバルト合金の製造
方法。7. The method according to claim 6, wherein 10 to 20% by weight of Co is replaced with Ni.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000218699A JP2002030375A (en) | 2000-07-14 | 2000-07-14 | Cobalt alloy, pipe using the same and method for producing the same alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000218699A JP2002030375A (en) | 2000-07-14 | 2000-07-14 | Cobalt alloy, pipe using the same and method for producing the same alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002030375A true JP2002030375A (en) | 2002-01-31 |
Family
ID=18713614
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000218699A Withdrawn JP2002030375A (en) | 2000-07-14 | 2000-07-14 | Cobalt alloy, pipe using the same and method for producing the same alloy |
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| Country | Link |
|---|---|
| JP (1) | JP2002030375A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110418688A (en) * | 2017-03-14 | 2019-11-05 | Vbn组件有限公司 | High-carbon content cobalt-base alloys |
-
2000
- 2000-07-14 JP JP2000218699A patent/JP2002030375A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110418688A (en) * | 2017-03-14 | 2019-11-05 | Vbn组件有限公司 | High-carbon content cobalt-base alloys |
| JP2020514560A (en) * | 2017-03-14 | 2020-05-21 | ヴァンベーエヌ コンポネンツ アクチエボラグ | High carbon cobalt alloy |
| CN110418688B (en) * | 2017-03-14 | 2022-04-05 | Vbn组件有限公司 | High carbon content cobalt-based alloy |
| JP7116495B2 (en) | 2017-03-14 | 2022-08-10 | ヴァンベーエヌ コンポネンツ アクチエボラグ | High carbon cobalt alloy |
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