Austenitic alloy

Patent metadata

Field	Value
Publication number	US-10487378-B2
Application number	US-201715404397-A
Country	US
Kind code	B2
Filing date	Jan 12, 2017
Priority date	Jan 18, 2012
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

An austenitic alloy comprising (in weight %):
C: 0.01-0.05 Si: 0.05-0.80 Mn: 1.5-2 Cr: 26-34.5 Ni: 30-35 Mo: 3-4 Cu: 0.5-1.5 N: 0.05-0.15 V: ≤0.15 the balance being Fe and unavoidable impurities, characterized in that 40≤% Ni+100*% N≤50.

First claim

The invention claimed is:

1. An austenitic alloy comprising in weight %:
C: 0.01-0.015
Si: 0.40-0.52
Mn: 1.7
Cr: 27
Ni: 33
Mo: 3.4
Cu: 0.9-1.0
N: 0.09-0.11
V: 0.07-0.09
the balance being Fe and unavoidable impurities,
wherein the weight % of N and Ni is balanced to fulfill the requirement 40<% Ni+100*% N<50, and
wherein the alloy has a microstructure that includes a MX phase.

2. The austenitic alloy according to claim 1 , wherein the weight % of N and Ni is balanced to fulfill the requirement 40<% Ni+100*% N<45.

3. The austenitic alloy according to claim 1 , wherein a creep test at 600° C. and a stress of 160 MPa exhibits a rupture elongation of 71 to 90% and a time to rupture of at least 100,000 hours, and wherein a creep test at 650° C. and a stress of 95 to 105 MPa exhibits a rupture elongation of 31 to 70% and a time to rupture of at least 95,000 hours.

4. The austenitic alloy according to claim 1 , wherein the time to rupture for the creep test at 600° C. and stress of 160 MPa is from 100,000 hours to about 117,500 hours, and wherein the time to rupture for the creep test at 650° C. and stress of 95 to 105 MPa is from 95,000 hours to about 188,000 hours.

5. A component for a combustion plant, the component comprising the austenitic alloy according to claim 1 .

6. The component for the combustion plant according to claim 5 , wherein said component is a reheater or an evaporator.

7. An austenitic alloy comprising in weight %:
C: 0.009-0.014
Si: 0.40-0.52
Mn: 1.70-1.73
Cr: 27.11-27.29
Ni: 33.21-33.45
Mo: 3.42-3.44
Cu: 0.95-0.98
N: 0.093-0.11
V: 0.07-0.09
the balance being Fe and unavoidable impurities,
wherein the weight % of N and Ni is balanced to fulfill the requirement 40≤% Ni+100*% N≤45, and
wherein the alloy has a microstructure that includes a MX phase.

8. The austenitic alloy according to claim 7 , wherein a creep test at 600° C. and a stress of 160 MPa exhibits a rupture elongation of 71 to 90% and a time to rupture of at least 100,000 hours, and wherein a creep test at 650° C. and a stress of 95 to 105 MPa exhibits a rupture elongation of 31 to 70% and a time to rupture of at least 95,000 hours.

9. A component for a combustion plant, the component comprising the austenitic alloy according to claim 7 .

10. The component for the combustion plant according to claim 9 , wherein said component is a reheater or an evaporator.

11. An austenitic alloy comprising in weight %:
C: 0.01-0.05
Si: 0.05-0.80
Mn: 1.5-2
Cr: 26-29
Ni: 33
Mo: 3.4
Cu: 0.5-1.5
N: 0.05-1.5
V: 0.07-0.09
the balance being Fe and unavoidable impurities,
wherein the weight % of N and Ni is balanced to fulfill the requirement 40<% Ni+100*% N<50, and
wherein the alloy has a microstructure that includes a MX phase.

12. The austenitic alloy according to claim 11 , wherein Cr is present in an amount of 27 weight %.

13. The austenitic alloy according to claim 11 , wherein the weight % of N and Ni is balanced to fulfill the requirement 40<% Ni+100*% N<45.

14. The austenitic alloy according to claim 13 , wherein Cr is present in an amount of 27 weight %.

15. The austenitic alloy according to claim 11 , wherein a creep test at 600° C. and a stress of 160 MPa exhibits a rupture elongation of 71 to 90% and a time to rupture from about 100,000 hours to about 117,500 hours, and wherein a creep test at 650° C. and a stress of 95 to 105 MP a exhibits a rupture elongation of 31 to 70% and a time to rupture of from about 95,000 hours to about 188,000 hours.

16. A component for a combustion plant, the component comprising the austenitic alloy according to claim 11 .

17. The component for the combustion plant according to claim 16 , wherein said component is a reheater or an evaporator.

18. An austenitic alloy comprising in weight %:
C: 0.01-0.05
Si: 0.05-0.80
Mn: 1.5-2
Cr: 26-29
Ni: 30-35
Mo: 3-3.4
Cu: 0.5-1.5
N: 0.05-0.15
V: 0.07-0.09
the balance being Fe and unavoidable impurities,
wherein the weight % of N and Ni is balanced to fulfill the requirement 40<% Ni+100*% N<50, and
wherein the alloy has a microstructure that includes a MX phase.

19. The austenitic alloy according to claim 18 , wherein Ni is present in an amount of 33-35 weight %.

20. The austenitic alloy according to claim 18 , wherein the weight % of N and Ni is balanced to fulfill the requirement 40<% Ni+100*% N<45.

21. An austenitic alloy comprising in weight %:
C: 0.01-0.05
Si: 0.05-0.80
Mn: 1.5-2
Cr: 26-29
Ni: 30-35
Mo: 3-3.4
Cu: 0.5-1.5
N: 0.05-0.15
V: 0.07-0.09
the balance being Fe and unavoidable impurities,
wherein the weight % of N and Ni is balanced to fulfill the requirement 40≤% Ni+100*% N≤45, and
wherein the alloy has a microstructure that includes a MX phase.

Assignees

• Sandvik Intellectual Property

Inventors

• Chai Guocai
• Högberg Jan
• Åkesson Sofia
• Forsberg Urban

Classifications

• C22C38/02

  containing silicon · CPC title

• C22C38/44

  with molybdenum or tungsten · CPC title

• C22C38/002

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• C22C38/58

  with more than 1.5% by weight of manganese · CPC title

• C22C38/001

  containing N · CPC title