High Cr-based austenitic stainless steel
View Patent ↗A high Cr austenitic stainless steel with a chemical composition consisting of in terms of % by mass, 0.03 to 0.12% of C, 0.10 to 1.00% of Si, 0.10 to 3.00% of Mn, 0.030% or less of P, 0.020% or less of S, 21.50 to 28.00% of Cr, more than 26.00 and not more than 35.00% of Ni, more than 2.00 and not more than 5.00% of W, 0.80% or less of Co, 0.01 to 0.70% of V, 0.15 to 1.00% of Nb, 0.001 to 0.040% of Al, 0.0001 to 0.0100% of B, 0.010 to 0.400% of N, 0.001 to 0.200% of Zr, 0.001 to 0.200% of Nd, 0.001 to 0.200% of Ta, 0.020 to 0.200% of Ta+0.8Nd+0.5Zr, 0.025% or less of Ti+Sn+Sb+Pb+As+Bi, 0.0090% or less of O, and a remainder consisting of Fe and impurities.
1. A high Cr-based austenitic stainless steel with a chemical composition consisting of in terms of % by mass:
0.03 to 0.12% of C,
0.10 to 1.00% of Si,
0.10 to 3.00% of Mn,
0.030% or less of P,
0.020% or less of S,
21.50 to 28.00% of Cr,
more than 26.00 and not more than 35.00% of Ni,
more than 2.00 and not more than 5.00% of W,
0.80% or less of Co,
0.01 to 0.70% of V,
0.15 to 1.00% of Nb,
0.001 to 0.040% of Al,
0.0001 to 0.0100% of B,
0.010 to 0.400% of N,
0.001 to 0.200% of Zr,
0.001 to 0.200% of Nd,
0.001 to 0.200% of Ta,
0.020 to 0.200% of Ta+0.8Nd+0.5Zr,
0.010% or less of Ti,
0.010% or less of Sn,
0.010% or less of Sb,
0.001% or less of Pb,
0.001% or less of As,
0.001% or less of Bi,
0.025% or less of Ti+Sn+Sb+Pb+As+Bi,
0.0090% or less of O,
4.00% or less of Cu,
2.00% or less of Mo,
0.20% or less of Ca,
0.20% or less of Mg,
0.20% or less in total of one or more of Y, Sc, Hf, Re, or lanthanoid elements other than Nd, and a remainder consisting of Fe and impurities.
2. The high Cr-based austenitic stainless steel according to claim 1 , wherein the chemical composition comprises, in terms of % by mass, 0.01 to 0.80% of Co.
3. The high Cr-based austenitic stainless steel according to claim 1 , wherein the chemical composition comprises, in terms of % by mass, one or more of: 0.01 to 4.00% of Cu, 0.01 to 2.00% of Mo, 0.0001 to 0.20% of Ca, or 0.0005 to 0.20% of Mg.
4. The high Cr-based austenitic stainless steel according to claim 1 , wherein the chemical composition comprises, in terms of % by mass, 0.001 to 0.20% in total of one or more of Y, Sc, Hf, Re, or lanthanoid elements other than Nd.
5. The high Cr-based austenitic stainless steel according to claim 1 , wherein a creep rupture strength at 750° C. and 100,000 hours is 50 MPa or more.
6. The high Cr-based austenitic stainless steel according to claim 2 , wherein the chemical composition comprises, in terms of % by mass, one or more of: 0.01 to 4.00% of Cu, 0.01 to 2.00% of Mo, 0.0001 to 0.20% of Ca, or 0.0005 to 0.20% of Mg.
7. The high Cr-based austenitic stainless steel according to claim 2 , wherein the chemical composition comprises, in terms of % by mass, 0.001 to 0.20% in total of one or more of Y, Sc, Hf, Re, or lanthanoid elements other than Nd.
8. The high Cr-based austenitic stainless steel according to claim 2 , wherein a creep rupture strength at 750° C. and 100,000 hours is 50 MPa or more.
9. The high Cr-based austenitic stainless steel according to claim 3 , wherein the chemical composition comprises, in terms of % by mass, 0.001 to 0.20% in total of one or more of Y, Sc, Hf, Re, or lanthanoid elements other than Nd.
10. The high Cr-based austenitic stainless steel according to claim 3 , wherein a creep rupture strength at 750° C. and 100,000 hours is 50 MPa or more.
11. The high Cr-based austenitic stainless steel according to claim 4 , wherein a creep rupture strength at 750° C. and 100,000 hours is 50 MPa or more.
12. A high Cr-based austenitic stainless steel with a chemical composition comprising in terms of % by mass:
0. 03 to 0.12% of C,
0.10 to 1.00% of Si,
0.10 to 3.00% of Mn,
0.030% or less of P,
0.020% or less of S,
21.50 to 28.00% of Cr,
more than 26.00 and not more than 35.00% of Ni,
more than 2.00 and not more than 5.00% of W,
0.80% or less of Co,
0.01 to 0.70% of V,
0.15 to 1.00% of Nb,
0.001 to 0.040% of Al,
0.0001 to 0.0100% of B,
0.010 to 0.400% of N,
0.001 to 0.200% of Zr,
0.001 to 0.200% of Nd,
0. 001 to 0.200% of Ta,
0.020 to 0.200% of Ta+0.8Nd+0.5Zr,
0.010% or less of Ti,
0.010% or less of Sn,
0.010% or less of Sb,
0.001% or less of Pb,
0.001% or less of As,
0.001% or less of Bi,
0.025% or less of Ti+Sn+Sb+Pb+As+Bi,
0.0090% or less of O,
4.00% or less of Cu,
2.00% or less of Mo,
0.20% or less of Ca,
0.20% or less of Mg,
0.20% or less in total of one or more of Y, Sc, Hf, Re, or lanthanoid elements other than Nd, and a remainder comprising Fe and impurities.
13. The high Cr-based austenitic stainless steel according to claim 12 , wherein the chemical composition comprises, in terms of % by mass, 0.01 to 0.80% of Co.
14. The high Cr-based austenitic stainless steel according to claim 12 , wherein the chemical composition comprises, in terms of % by mass, one or more of: 0.01 to 4.00% of Cu, 0.01 to 2.00% of Mo, 0.0001 to 0.20% of Ca, or 0.0005 to 0.20% of Mg.
15. The high Cr-based austenitic stainless steel according to claim 12 , wherein the chemical composition comprises, in terms of % by mass, 0.001 to 0.20% in total of one or more of Y, Sc, Hf, Re, or lanthanoid elements other than Nd.
16. The high Cr-based austenitic stainless steel according to claim 12 , wherein a creep rupture strength at 750° C. and 100,000 hours is 50 MPa or more.