JPH08291355A - Chromium-base heat resistant alloy - Google Patents
Chromium-base heat resistant alloyInfo
- Publication number
- JPH08291355A JPH08291355A JP17772695A JP17772695A JPH08291355A JP H08291355 A JPH08291355 A JP H08291355A JP 17772695 A JP17772695 A JP 17772695A JP 17772695 A JP17772695 A JP 17772695A JP H08291355 A JPH08291355 A JP H08291355A
- Authority
- JP
- Japan
- Prior art keywords
- strength
- resistant alloy
- heat resistant
- base heat
- alloy
- 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.)
- Granted
Links
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- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
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 1. Field of the Invention The present invention relates to a steel supporting member (skid button) to be heated in a heating furnace, etc.
It belongs to a Cr-based heat-resistant alloy used for members that require 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 high Ni steel and high Cr high Mo steel have been used for skid buttons, but in recent years ceramics have also been used due to the need to raise 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 apt to cause brittle fracture in nature, which has not been widely used as a problem.
【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 a skid button and excellent in high temperature strength, Cr-based alloys have been developed. This Cr
Among the metallic materials, the base alloy has high corrosion resistance and has a very high melting point, so that the high temperature strength is high, but 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 problems, and an object thereof is to provide a Cr-based heat-resistant alloy for skid buttons, which has excellent high temperature strength and has 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Fe、
NiおよびCoの一種または二種以上と不可避的不純物から
なる高温強度に優れるCr基耐熱合金である。SUMMARY OF THE INVENTION The gist of the present invention is that the mass% is
, Cr: over 95%, N: 0.1-2.0%, balance Fe,
It is a Cr-based heat-resistant alloy that is excellent in high-temperature strength and contains one or more kinds of Ni and Co and inevitable impurities.
【０００６】さらに、上記Cr基耐熱合金に、安定な窒化
物形成元素であるTi、Al、Zr、Nb、B 、V の内の一種ま
たは二種以上を合計で 0.3％以上含有する高温強度に優
れるCr基耐熱合金である。Further, the above Cr-based heat-resistant alloy has a high-temperature strength containing 0.3% or more in total of one or more of stable nitride-forming elements Ti, Al, Zr, Nb, B, and V. It is an excellent 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 component range 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 exceed 95% in order to improve 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。N is very effective as an element for improving the strength of Cr-based alloys. This is due to the precipitation strengthening of N 2 with chromium nitride, but if the N content is less than 0.1%, the effect of improving the strength is small, and if it exceeds 2.0%, it becomes unusable as a skid button due to reduced ductility. 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 N is added by the following method. Dissolution
In the case of the casting process, a method of melting nitrogen in the melting / casting atmosphere into the molten metal and a method of adding nitride powder into the molten metal are used together.
【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。The powder sintering process is performed by nitriding the Cr alloy powder or by mixing the nitride powder with the Cr alloy powder and sintering.
【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, and when these are added at the same time as N, stable nitrides are finely precipitated to suppress coarsening of crystal grains. You can Therefore, one or more of Ti, Al, Zr, Nb, B and V are contained in a total amount of 0.3% or more. The reason for limiting the content to 0.3% or more is that if it is less than 0.3%, the effect of suppressing coarsening of crystal grains does not appear.
【００１２】さらに、Fe、NiおよびCoの一種または二種
以上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Fe、NiおよびCoの一種または二種以上を添加する。
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。Furthermore, by containing one or more of Fe, Ni and Co, the oxidation resistance and nitriding resistance of the Cr-based alloy can be secured. Therefore, in the present invention, one or more of Fe, Ni and Co are added as the balance.
Further, as the unavoidable impurities, a metal element in the nitride powder used when adding N 2, for example, Ti in TiN powder is also included.
【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-base heat-resistant alloy of the present invention has a Cr content exceeding 95% and by adding N, the high-temperature strength is significantly improved as compared with the conventional Cr-base alloy for skid buttons. Improved. The Cr-base 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 the melting / casting process. For these Cr-based alloys, compression creep test, high temperature tensile test, high temperature oxidation test, high temperature corrosion test and Vickers hardness test were conducted. The high temperature corrosion test was performed by applying the flux used in the continuous casting operation in the steel making 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 results of each test.
【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Compressive creep test Temperature: 1300 ° C., stress: 4 MPa, time: 8 h High temperature tensile test Temperature: 1300 ° C., strain rate: 10 −3 s −1 high temperature oxidation test Temperature: 1300 ° C., time: 24 h 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, Cr exceeds 95%,
In addition, in the example of the present invention containing N 2, the creep strength is remarkably improved. Further, the higher the Cr content, the higher the creep strength and the smaller the Vickers hardness, so that the machinability is greatly improved. However, in the comparative example N
As shown in o.1 and 2, the creep strength is insufficient when N is not added even if the Cr content is high. In addition, Nos. 16 to 22 of the examples of the present invention 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。As the amount of N added increases,
Although the creep strength is improved, the hardness is also increased and the machinability is deteriorated at the same time, so the addition amount of N 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 alloys of the present invention are all 10%.
Since it has the above elongation, 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
Although it depends on the Fe content as well, it mainly depends on the Cr content.
It is recognized that the higher the content, the worse the tendency, but the examples of the present invention are at a level where 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, improvement in high temperature strength can extend the life of the skid button and reduce the running cost of the heating furnace. Further, it can be used as a member other than the skid button, which is required to have strength, ductility and corrosion resistance at ultrahigh temperatures at the same time, for example, a substitute member for a refractory brick such as an incinerator and a melting swirl furnace.
Claims (2)
％を含有し、残部Fe、NiおよびCoの一種または二種以上
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: exceeds 95%, N: 0.1 to 2.0
%, And the balance is one or more kinds of Fe, Ni and Co and inevitable impurities, and it is a Cr-based heat-resistant alloy excellent in 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Fe、Ni
およびCoの一種または二種以上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: exceeds 95%, N: 0.1 to 2.0
%, And further contains one or more of Ti, Al, Zr, Nb, B, and V in a total of 0.3% or more, and the balance Fe, Ni.
A Cr-based heat-resistant alloy having excellent high-temperature strength, which is composed of one or more Co and inevitable impurities and inevitable impurities.
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 true JPH08291355A (en) | 1996-11-05 |
| JP3207082B2 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) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10718038B2 (en) | 2014-09-29 | 2020-07-21 | Hitachi, Ltd. | Two-phase alloy, product using said two-phase alloy, and method for producing said product |
| CN113444950A (en) * | 2021-07-08 | 2021-09-28 | 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 |
| US11180833B2 (en) | 2016-03-30 | 2021-11-23 | Hitachi, Ltd. | Chromium-based two-phase alloy and product using said two-phase alloy |
-
1995
- 1995-07-13 JP JP17772695A patent/JP3207082B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10718038B2 (en) | 2014-09-29 | 2020-07-21 | Hitachi, Ltd. | Two-phase alloy, product using said two-phase alloy, and method 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 |
| CN113444950A (en) * | 2021-07-08 | 2021-09-28 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3207082B2 (en) | 2001-09-10 |
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