Claims
- 1. In a heat exchanger unit exposed to sulphur-, chloride-, or alkaline-containing environments at temperatures of 300 to 550.degree. C., the tubes of the heat exchanger comprising seamless tubes of an austenitic Ni-based alloy having good workability, good corrosion resistance and good structure stability comprising, in weight %:
- ______________________________________C up to 0.025%.Cr 20-27%.Mo 8-12%Si up to 0.5%.Mn up to 0.5%.Al up to 0.3%.N up to 0.1%.Fe 3-15%Ti up to 0.5%Nb up to 0.5%.______________________________________
- and
- a balance of the alloy being Ni and unavoidable impurities with Cr and Mo being present in amounts such that 45.ltoreq.(% Cr)+3(% Mo).ltoreq.57.
- 2. In a method of generating power in a power boiler for municipal and industrial waste incinerators, the power being generated by passing a fluid heat exchange medium through seamless tubes, the tubes comprising superheater tubes of the power boiler, the tubes made of an austenitic Ni-based alloy having good workability, good corrosion resistance and good structure stability, the alloy comprising, in weight %:
- ______________________________________C up to 0.025%.Cr 20-27%.Mo 8-12%.Si up to 0.5%.Mn up to 0.5%.Al up to 0.3%.N up to 0.1%,Fe 3-15%.Ti up to 0.5%Nb up to 0.5%______________________________________
- and
- a balance of the alloy being Ni and unavoidable impurities with Cr and Mo being present in amounts such that 45.ltoreq.(% Cr)+3(% Mo).ltoreq.57.
- 3. The method according to claim 2, wherein said Ni-based alloy tubes are exposed to elevated temperatures of 300-550.degree. C.
- 4. In a method of generating power in a power boiler for municipal and industrial waste incinerators, the power being generated by passing a fluid heat exchange medium through seamless tubes, the tubes comprising boiler tubes of the power boiler, the tubes made of an austenitic Ni-based alloy having good workability, good corrosion resistance and good structure stability, the alloy comprising, in weight %:
- ______________________________________C up to 0.025%.Cr 20-27%.Mo 8-12%.Si up to 0.5%.Mn up to 0.5%.Al up to 0.3%.N up to 0.1%.Fe 3-15%.Ti up to 0.5%.Nb up to 0.5%______________________________________
- and
- a balance of the alloy being Ni and unavoidable impurities with Cr and Mo being present in amounts such that 45.ltoreq.(% Cr)+3(% Mo).ltoreq.57.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9401695 |
May 1994 |
SEX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/443,668 , filed May 18, 1995, now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (4)
Number |
Date |
Country |
60-211030 |
Oct 1985 |
JPX |
63-278690 |
Nov 1988 |
JPX |
6-306553 |
Nov 1994 |
JPX |
7003368 |
Jan 1995 |
JPX |
Non-Patent Literature Citations (1)
Entry |
R.B. Frank & T.A. DeBold; "A New Age Hardenable Corrosion-Resistant Alloy"; ASM Materials Conference, Oct. 7, 1986; published Dec. |
Continuations (1)
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Number |
Date |
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Parent |
443668 |
May 1995 |
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