Austenitic alloy
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, wherein 40<% Ni+100*% N<50.
1. 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<45,
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,
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, and
wherein the alloy has a microstructure that includes a MX phase.
2. 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.
3. A component for a combustion plant, the component comprising an austenitic alloy 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 40<% Ni+100*% N<45, and
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
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 from about 95,000 hours to about 188,000 hours, and
wherein the alloy has a microstructure that includes a MX phase.
4. A component for a combustion plant according to claim 3 , wherein said component is a superheater.
5. A component for a combustion plant according to claim 3 , wherein said component is a reheater.
6. A component for a combustion plant according to claim 3 , wherein said component is an evaporator.
7. 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,
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,
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 from about 95,000 hours to about 188,000 hours, and
wherein the alloy has a microstructure that includes a MX phase.
8. The austenitic alloy according to claim 7 , wherein the time to rupture for the creep test at 600° C. and stress of 160 MPa is from 102,321 hours to 117,561 hours, and wherein the time to rupture for the creep test at 650° C. and stress of 95 to 105 MPa is from 95,883 hours to 188,609 hours.