TOP > 外国特許検索 > Cr-based alloy having an excellent strength-ductility balance at high temperature

Cr-based alloy having an excellent strength-ductility balance at high temperature

外国特許コード F110003133
整理番号 A061-09US1
掲載日 2011年6月15日
出願国 アメリカ合衆国
出願番号 21164105
公報番号 20050281703
公報番号 8685315
出願日 平成17年8月26日(2005.8.26)
公報発行日 平成17年12月22日(2005.12.22)
公報発行日 平成26年4月1日(2014.4.1)
国際出願番号 JP2000003399
国際公開番号 WO2000073523
国際出願日 平成12年5月26日(2000.5.26)
国際公開日 平成12年12月7日(2000.12.7)
優先権データ
  • 特願1999-148326 (1999.5.27) JP
  • 09/926,600 (2001.11.26) US
  • 2000JP003399 (2000.5.26) WO
発明の名称 (英語) Cr-based alloy having an excellent strength-ductility balance at high temperature
発明の概要(英語) A strength-ductility balance at a high temperature above 1000° C., particularly a high temperature above 1050° C. is improved by rendering a chemical composition of Cr-based alloy into Cr: more than 60 mass % but less than 65 mass %, C+N: not more than 20 mass ppm, S: not more than 20 mass ppm, O: not more than 100 mass ppm, O as an oxide: not more than 50 mass ppm, and the remainder being Fe and inevitable impurities.
従来技術、競合技術の概要(英語) BACKGROUND ART
With the advance of techniques in recent industrial and manufacturing fields and the rise of interest in environmental problem, it is strongly demanded to develop metallic materials having high strength and ductility at higher temperatures, particularly a high temperature zone of not lower than 1000 deg. C.
Incidentally, high-temperature materials used from the old time were mainly Ni-based, Cr-based and Co-based alloys.
For example, JP-A-55-154542 proposes Ni-based alloy comprising Cr: 20.about.35 wt %, Si: 1.about.8 wt % and C: 1.7.about.3.5 wt % and forming M7C3 type carbide, and also JP-A-61-7145 proposes Ni -- Co -- Cr based alloy comprising Ni: 20.about.47 wt %, Co: 6.about.35 wt %, Cr: 18.about.36 wt %, C: 0.6.about.2.5 wt % and Si: 0.5.about.2.5 wt %. However, all of these alloys could be practically used up to only a temperature of about 500 deg. C. And also, these alloys containing a greater amount of Ni or Co have many problems that the cost of the material itself is very expensive and the thermal expansion coefficient is high.
A Cr-based alloy is hopeful as a high-temperature material being cheaper than Ni- or Co-based alloy and small in the thermal expansion coefficient.
For example, JP-A-11-80902 proposes a high-Cr alloy containing C: 0.5.about.1.5 wt %, Si: 1.0.about.4.0 wt %, Mn: 0.5.about.2.0 wt % and Cr: 35.about.60 wt % and enhancing a resistance to erosion and corrosion at a higher temperature.
However, even in this high-Cr alloy, it is difficult to obtain a sufficient strength at a high temperature zone, particularly above 1000 deg. C. In order to further increase the strength of such a Cr-based alloy, it is required to more increase the Cr amount.
In the conventional technique, however, when the Cr amount is not less than 60 mass %, the ductility is substantially lost, so that there is a problem that the working after the production is impossible.
Therefore, the alloy containing Cr of not less than 60 mass % has been not yet put into practical use.
As mentioned above, practical materials having a sufficient strength at the high temperature and a good workability (ductility) is not existent in spite of a situation that it is more increased to demand materials durable to use under a super-high temperature environment.
It is, therefore, an object of the invention to solve the above problems of the conventional technique and to provide Cr-based alloys having an excellent strength-ductility balance, which has never been attained in the conventional alloy, at a high temperature above 1000 deg. C., particularly a high temperature above 1050 deg. C.

特許請求の範囲(英語) [claim1]
1. A Cr-based alloy having an excellent strength-ductility balance at temperatures not lower than 1000 deg. C. and having strength-ductility balance of RA * TS >= 10000 (%.MPa) at 1000 deg. C. to 1200 deg. C., consisting of Cr: more than 60 mass % but less than 65 mass %, C+N: present in a range of 0.1 mass ppm to 20 mass ppm, S: present in a range of 0.1 mass ppm to 20 mass ppm, O: present in a range of 5 mass ppm to 100 mass ppm, O as an oxide: present in a range of 3 mass ppm to 50 mass ppm, and the remainder being Fe and inevitable impurities.
[claim2]
2. The Cr-based alloy according to claim 1 wherein the O as an oxide is present in a range of 3 mass ppm to 30 mass ppm.
[claim3]
3. The Cr-based alloy according to claim 1 wherein the O is present in a range of 5 mass ppm to 50 mass ppm.
[claim4]
4. The Cr-based alloy according to claim 3 wherein the O as an oxide is present in a range of 3 mass ppm to 30 mass ppm.
[claim5]
5. The Cr-based alloy according to claim 1 wherein the S is present in a range of 0.1 mass ppm to 10 mass ppm.
[claim6]
6. The Cr-based alloy according to claim 5 wherein the O as an oxide is present in a range of 3 mass ppm to 30 mass ppm.
[claim7]
7. The Cr-based alloy according to claim 5 wherein the O is present in a range of 5 mass ppm to 50 mass ppm.
[claim8]
8. The Cr-based alloy according to claim 7 wherein the O as an oxide is present in a range of 3 mass ppm to 30 mass ppm.
  • 発明者/出願人(英語)
  • ABIKO KENJI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 420/428
参考情報 (研究プロジェクト等) CREST Phenomena of Extreme Conditions AREA
ライセンスをご希望の方、特許の内容に興味を持たれた方は、問合せボタンを押してください。

PAGE TOP

close
close
close
close
close
close