JP3207082B2 - Cr-based heat-resistant alloy - Google Patents
Cr-based heat-resistant alloyInfo
- Publication number
- JP3207082B2 JP3207082B2 JP17772695A JP17772695A JP3207082B2 JP 3207082 B2 JP3207082 B2 JP 3207082B2 JP 17772695 A JP17772695 A JP 17772695A JP 17772695 A JP17772695 A JP 17772695A JP 3207082 B2 JP3207082 B2 JP 3207082B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- resistant alloy
- based heat
- strength
- present
- 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 - Lifetime
Links
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、加熱炉内の被加熱
鋼材支持部材（スキッドボタン）等、超高温下で強度、
延性および耐食性が必要な部材に使用されるCr基耐熱合
金に属するものである。BACKGROUND OF THE INVENTION The present invention relates to a method for supporting a steel member to be heated (skid button) in a heating furnace, which has a high strength at an extremely high temperature.
It belongs to a Cr-based heat-resistant alloy used for members requiring ductility and corrosion resistance.
【０００２】[0002]
【従来の技術】従来、スキッドボタンには高Cr高Ni鋼や
高Cr高Mo鋼が使用されてきたが、加熱炉内温度の上昇お
よびスキッドマークの低減の必要により、近年ではセラ
ミックスの使用も検討されるようになっている。しか
し、セラミックスは高温強度の点では非常に優れている
ものの、本質的に脆性破壊を生じやすく、それが問題と
なって広く使用されるには至っていない。2. Description of the Related Art Conventionally, high Cr and high Ni steel and high Cr and high Mo steel have been used for skid buttons. However, ceramics have recently been used due to the need to increase the temperature in the heating furnace and reduce skid marks. It is being considered. However, although ceramics are very excellent in high-temperature strength, they are inherently susceptible to brittle fracture, which has become a problem and has not been widely used.
【０００３】そこで最近では、特開平4-301048号公報お
よび特開平4-301049号公報に開示してあるようにスキッ
ドボタンに必要とされる延性があって、かつ高温強度に
優れた合金として、Cr基合金が開発されている。このCr
基合金は金属材料の中では、高耐食性を有し、かつ非常
に高融点であるため高温強度が高いが、セラミックスと
比較するとまだ十分な強度を有しているとはいえない状
況にある。Therefore, recently, as disclosed in JP-A-4-301048 and JP-A-4-301049, as an alloy having the ductility required for skid buttons and having excellent high-temperature strength, Cr-based alloys have been developed. This Cr
Although the base alloy has high corrosion resistance among metal materials and has a very high melting point, it has high strength at high temperatures, but is still in a situation where it cannot be said that it has sufficient strength as compared with ceramics.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記のよう
な問題点を解決するためになされたもので、高温強度に
優れたより長寿命のスキッドボタン用Cr基耐熱合金を提
供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a Cr-based heat-resistant alloy for skid buttons having excellent high-temperature strength and a longer life. And
【０００５】[0005]
【課題を解決するための手段】本発明の要旨は、質量％
で、Cr：95％超え、N：0.1〜2.0％を含有し、残部Ni、C
oのいずれか一種と不可避的不純物からなる高温強度に
優れることを特徴とするCr基耐熱合金である。または、
質量％で、Cr：95％超え、N：0.1〜2.0％を含有し、残
部Fe、NiおよびCoと不可避的不純物からなる高温強度に
優れることを特徴とするCr基耐熱合金である。 The gist of the present invention is that the mass%
And contains Cr: more than 95%, N: 0.1 to 2.0%, and the balance Ni, C
A Cr-based heat-resistant alloy characterized by having excellent high-temperature strength comprising any one of O and unavoidable impurities. Or
By mass%, Cr: more than 95%, N: 0.1 to 2.0%, remaining
High temperature strength consisting of Fe, Ni and Co and unavoidable impurities
It is a Cr-based heat-resistant alloy characterized by excellent properties.
【０００６】或いは、質量％で、Cr：95％超え、N：0.1
〜2.0％を含有し、さらにTi、Al、Zr、Nb、B、Vの内の
一種または二種以上を合計で0.3％以上含有し、残部Ni
と不可避的不純物からなる高温強度に優れることを特徴
とするCr基耐熱合金である。 Alternatively, in mass%, Cr: more than 95%, N: 0.1
~ 2.0%, and among Ti, Al, Zr, Nb, B and V
Contains at least 0.3% of one or more types, with the balance being Ni
And high-temperature strength consisting of unavoidable impurities
It is a Cr-based heat-resistant alloy.
【０００７】以下に、本発明の成分範囲限定理由につい
て説明する。Crは、耐熱合金の基本成分として必要であ
り、本発明では高温強度向上のためにCr含有量は95％超
えとした。The reasons for limiting the range of the components of the present invention will be described below. Cr is necessary as a basic component of the heat-resistant alloy, and in the present invention, the Cr content is set to more than 95% in order to improve the high-temperature strength.
【０００８】N は、Cr基合金の強度を向上させる元素と
して非常に有効である。これはN の窒化クロムによる析
出強化によるものであるが、N 含有量が 0.1％未満では
強度向上の効果は小さく、また 2.0％を超えると延性低
下によりスキッドボタンとして使用不可能となる。した
がって、N 含有量は 0.1〜2.0 ％の範囲に限定する。[0008] N is very effective as an element for improving the strength of a Cr-based alloy. This is due to the precipitation strengthening of N 2 by chromium nitride. If the N content is less than 0.1%, the effect of improving the strength is small, and if it exceeds 2.0%, the ductility is reduced and it cannot be used as a skid button. Therefore, the N content is limited to the range of 0.1 to 2.0%.
【０００９】なお、N の添加は次の方法で行う。溶解・
鋳造プロセスの場合は、 溶解・鋳造雰囲気中の窒素
を溶湯中に溶かし込む方法、 窒化物の粉末を溶湯中
に添加する方法、 とを併用する方法で行う。The addition of N is carried out by the following method. Dissolution
In the case of the casting process, a method of dissolving nitrogen in the melting / casting atmosphere into the molten metal and a method of adding nitride powder to the molten metal are used in combination.
【００１０】粉末焼結プロセスの場合は、 Cr合金粉
末を窒化させる方法、 窒化物粉末をCr合金粉末と混
合して焼結する方法で行う。In the case of the powder sintering process, a method of nitriding a Cr alloy powder and a method of mixing a nitride powder with a Cr alloy powder and sintering the mixture are performed.
【００１１】Ti、Al、Zr、Nb、B 、V は、安定な窒化物
形成元素で、これらをN と同時に添加すると安定な窒化
物を微細に析出し、結晶粒の粗大化を抑制することがで
きる。このために、Ti、Al、Zr、Nb、B 、V の内の一種
または二種以上を合計で 0.3％以上含有させる。含有量
を 0.3％以上に限定した理由は、 0.3％未満では結晶粒
の粗大化抑制効果が現れないからである。Ti, Al, Zr, Nb, B, and V are stable nitride-forming elements. When they are added together with N, stable nitrides are finely precipitated to suppress coarsening of crystal grains. Can be. To this end, one or more of Ti, Al, Zr, Nb, B, and V are contained in a total amount of 0.3% or more. The reason why the content is limited to 0.3% or more is that if it is less than 0.3%, the effect of suppressing crystal grain coarsening does not appear.
【００１２】さらに、Ni、Coのいずれか一種を含有する
か、またはFe、Ni、Coの三種を含有することにより、Cr
基合金の耐酸化性および耐窒化性が確保できる。したが
って、本発明では残部としてNi、Coのいずれか一種を添
加するか、またはFe、Ni、Coの三種を添加する。また、
不可避的不純物としては、N の添加時に使用される窒化
物粉末中の金属元素、例えば TiN粉末中のTiも含まれ
る。Further, it contains any one of Ni and Co.
Or by containing three kinds of Fe, Ni, Co
Oxidation resistance and nitridation resistance of the base alloy can be secured. Therefore, in the present invention, one of Ni and Co is added as the balance.
Or three kinds of Fe, Ni and Co are added. Also,
The unavoidable impurities include metal elements in the nitride powder used when N is added, for example, Ti in the TiN powder.
【００１３】[0013]
【発明の実施の形態】本発明のCr基耐熱合金は、Cr含有
量が95％超えでかつN を添加することにより、従来のス
キッドボタン用Cr基合金と比較して、高温強度が画期的
に向上した。また、本発明のCr基耐熱合金は溶解・鋳造
プロセスあるいは粉末焼結プロセスによって製造され
る。BEST MODE FOR CARRYING OUT THE INVENTION The Cr-based heat-resistant alloy of the present invention has an epoch-making high-temperature strength compared with a conventional Cr-based alloy for a skid button by adding N 2 and having a Cr content exceeding 95%. Improved. Further, the Cr-based heat-resistant alloy of the present invention is manufactured by a melting / casting process or a powder sintering process.
【００１４】[0014]
【実施例】本発明の具体例を以下に示す。供試合金は、
溶解・鋳造プロセスで製造したCr基合金で、化学組成を
表１に示す。これらのCr基合金について、圧縮クリープ
試験、高温引張試験、高温酸化試験、高温腐食試験およ
びビッカース硬さ試験を行った。高温腐食試験は製鋼工
程の連続鋳造作業で使用するフラックスを塗布して行っ
た。これはスラブ表面に付着したフラックスがスキッド
ボタンの腐食を引き起こすからである。それぞれの試験
条件は下記の通りである。また、各試験結果を表２に示
す。EXAMPLES Specific examples of the present invention are shown below. The match money is
Table 1 shows the chemical composition of a Cr-based alloy produced by a melting and casting process. These Cr-based alloys were subjected to a compression creep test, a high temperature tensile test, a high temperature oxidation test, a high temperature corrosion test, and a Vickers hardness test. The high temperature corrosion test was performed by applying a flux used in a continuous casting operation in a steelmaking process. This is because the flux attached to the slab surface causes corrosion of the skid button. The respective test conditions are as follows. Table 2 shows the test results.
【００１５】 圧縮クリープ試験 温度：1300℃、応力：4MPa、時間：8h 高温引張試験 温度：1300℃、ひずみ速度：10-3 s-1 高温酸化試験 温度：1300℃、時間：24h 高温腐食試験 温度：1300℃、フラックス塗布試験、時間：24h ビッカース硬さ試験 室温で硬さ測定Compression creep test Temperature: 1300 ° C, stress: 4 MPa, time: 8h High-temperature tensile test Temperature: 1300 ° C, strain rate: 10 -3 s -1 High-temperature oxidation test Temperature: 1300 ° C, time: 24h High-temperature corrosion test Temperature : 1300 ℃, flux application test, time: 24h Vickers hardness test Hardness measurement at room temperature
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【表２】 [Table 2]
【００１８】表２から明らかなように、Crを95％超え、
かつN を含有する本発明例では、クリープ強度が画期的
に向上している。また、Cr含有量が多いほどクリープ強
度が向上し、さらにビッカース硬さが小さくなることか
ら機械加工性が大幅に改善される。しかし、比較例の N
o.１、２に示すように、Cr含有量が多くてもN 無添加の
場合はクリープ強度が不十分である。また、N と同時に
安定な窒化物形成元素を含有する本発明例の No.16〜22
は、さらにクリープ強度が向上している。As is clear from Table 2, the content of Cr exceeds 95%,
In addition, in the example of the present invention containing N 2, the creep strength is remarkably improved. In addition, as the Cr content increases, the creep strength improves, and the Vickers hardness decreases, so that the machinability is greatly improved. However, N
As shown in o.1 and 2, even when the Cr content is large, the creep strength is insufficient when N is not added. In addition, N of the present invention examples containing a stable nitride-forming element simultaneously with N
Has further improved creep strength.
【００１９】N 添加はその添加量が増加するにつれて、
クリープ強度は向上するが、同時に硬さを増加させ機械
加工性を悪化させるので、N の添加量は両者のバランス
で決定する。The addition of N increases as the amount of addition increases.
The creep strength is improved, but at the same time, the hardness is increased and the machinability is deteriorated. Therefore, the amount of N added is determined by the balance between the two.
【００２０】高温引張り伸びについては、セラミックス
とは異なって、本発明例のCr基耐熱合金はいずれも10％
以上の伸びを有しており、高い延性を有していることが
わかる。Regarding the high-temperature tensile elongation, unlike the ceramics, the Cr-based heat-resistant alloy of the present invention has a 10%
It has the above elongation, and it turns out that it has high ductility.
【００２１】高温酸化および高温腐食は、Ni、Coおよび
Feの含有量にも依存するが、主にCr含有量に依存し、Cr
含有量が多いほど悪くなる傾向が認められるが、本発明
例はスキッドボタンとしては問題ないレベルにある。High temperature oxidation and high temperature corrosion are caused by Ni, Co and
It depends on the Fe content, but mainly depends on the Cr content,
Although a tendency that the higher the content is, the worse it is recognized, the example of the present invention is at a level at which there is no problem as a skid button.
【００２２】[0022]
【発明の効果】以上述べたところから明らかなように、
本発明によれば高温強度の向上によりスキッドボタンの
寿命を延ばし、加熱炉のランニングコストを低減するこ
とができた。また、スキッドボタン以外の超高温下で強
度、延性および耐食性が同時に要求される部材、例えば
焼却炉、溶融旋回炉等の耐火煉瓦の代替部材にも使用す
ることができる。As is apparent from the above description,
According to the present invention, the service life of the skid button can be extended by improving the high-temperature strength, and the running cost of the heating furnace can be reduced. Further, it can be used as a member other than the skid button, which is required to have strength, ductility and corrosion resistance at an ultra-high temperature at the same time, for example, an alternative member of a refractory brick such as an incinerator and a slewing furnace.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平４−301049（ＪＰ，Ａ) 特開 平６−49533（ＪＰ，Ａ) 特開 平３−162545（ＪＰ，Ａ) 特開 昭49−113711（ＪＰ，Ａ) 特開 平３−211248（ＪＰ，Ａ) 特開 平５−271840（ＪＰ，Ａ) 特公 昭51−4927（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) C22C 27/06 ＲＥＧＩＳＴＲＹ（ＳＴＮ)──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-301049 (JP, A) JP-A-6-49533 (JP, A) JP-A-3-162545 (JP, A) JP-A-49-49 113711 (JP, A) JP-A-3-211248 (JP, A) JP-A-5-271840 (JP, A) JP-B-51-4927 (JP, B1) (58) Fields investigated (Int. Cl. 7 , DB name) C22C 27/06 REGISTRY (STN)
Claims (3)
％を含有し、残部Ni、Coのいずれか一種と不可避的不純
物からなる高温強度に優れることを特徴とするCr基耐熱
合金。(1) In mass%, Cr: more than 95%, N: 0.1 to 2.0
% Cr, which is excellent in high-temperature strength consisting of any one of Ni and Co and inevitable impurities.
％を含有し、残部Fe、NiおよびCoと不可避的不純物から
なる高温強度に優れることを特徴とするCr基耐熱合金。 2. In mass%, Cr: more than 95%, N: 0.1 to 2.0.
%, From the balance Fe, Ni and Co and inevitable impurities
Cr-based heat-resistant alloy characterized by excellent high-temperature strength.
％を含有し、さらにTi、Al、Zr、Nb、B、Vの内の一種ま
たは二種以上を合計で0.3％以上含有し、残部Niと不可
避的不純物からなる高温強度に優れることを特徴とする
Cr基耐熱合金。3. In mass%, Cr: more than 95%, N: 0.1 to 2.0
% Containing further Ti, Al, Zr, Nb, B, high-temperature strength of one or two or more contain a total of 0.3% or more, consisting of the remaining portion Ni and No <br/> avoidable impurities of the V Characterized by excellent
Cr-based heat-resistant alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17772695A JP3207082B2 (en) | 1995-02-21 | 1995-07-13 | Cr-based heat-resistant alloy |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3220695 | 1995-02-21 | ||
| JP7-32206 | 1995-02-21 | ||
| JP17772695A JP3207082B2 (en) | 1995-02-21 | 1995-07-13 | Cr-based heat-resistant alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08291355A JPH08291355A (en) | 1996-11-05 |
| JP3207082B2 true JP3207082B2 (en) | 2001-09-10 |
Family
ID=26370743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17772695A Expired - Lifetime JP3207082B2 (en) | 1995-02-21 | 1995-07-13 | Cr-based heat-resistant alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3207082B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016052445A1 (en) | 2014-09-29 | 2016-04-07 | 株式会社日立製作所 | Two-phase alloy, product obtained using said two-phase alloy, and process for producing said product |
| US11180833B2 (en) | 2016-03-30 | 2021-11-23 | Hitachi, Ltd. | Chromium-based two-phase alloy and product using said two-phase alloy |
| CN113444950B (en) * | 2021-07-08 | 2022-04-29 | 烟台新钢联冶金科技有限公司 | Chromium-based high-nitrogen alloy cushion block for silicon steel high-temperature heating furnace and preparation method thereof |
-
1995
- 1995-07-13 JP JP17772695A patent/JP3207082B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08291355A (en) | 1996-11-05 |
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