HEAT-RESISTANT AND CORROSION-RESISTANT HIGH-CHROMIUM NICKEL-BASED ALLOY WITH SUPERIOR HOT FORGEABILITY

• US 20190062877A1
• Filed: 02/22/2017
• Published: 02/28/2019
• Est. Priority Date: 03/15/2016
• Status: Active Grant

• Current Assignee: Hitachi Metals (Thailand) Ltd.
• Original Assignee: Hitachi Metals (Thailand) Ltd.
• Inventors: Sugahara, Katsuo
• Granted Patent: US 10,458,005 B2
• Time in Patent Office: Days
• CPC Class Codes: C22C 19/05 with chromium
• CPC Class Codes: C22C 19/052 with the maximum Cr content being at least 40%
• CPC Class Codes: C22F 1/10 of nickel or cobalt or alloys based thereon
• CPC Class Codes: F22B 37/04 and characterised by material, e.g. use of special steel alloy

Abstract

Provided is a heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability, consisting of, by mass %, 43.1 to 45.5% of Cr, 0.5 to 1.5% of Mo, 0.0001 to 0.0090% of Mg, 0.001 to 0.040% of N, 0.05 to 0.50% of Mn, 0.01 to 0.10% of Si, 0.05 to 1.00% of Fe, 0.01% to 1.00% of Co, 0.01 to 0.30% of Al, 0.04 to 0.3% of Ti, 0.0003 to 0.0900% of V, 0.0001 to 0.0100% of B, 0.001 to 0.050% of Zr, and optionally one or more elements selected from (a) to (d): (a) 0.001 to 0.020% of Cu; (b) 0.001 to 0.100% of W; (c) 0.0001 or more and less than 0.0020% of Ca; and (d) 0.001% or more and less than 0.100% of Nb, and the balance of Ni with inevitable impurities.

Claims

1. A heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability, the alloy having a composition consisting of, by mass %,

43.1 to 45.5% of Cr,

0.5 to 1.5% of Mo,

0.0001 to 0.0090% of Mg,

0.001 to 0.040% of N,

0.05 to 0.50% of Mn,

0.01 to 0.10% of Si,

0.05 to 1.00% of Fe,

0.01% to 1.00% of Co,

0.01 to 0.30% of Al,

0.04 to 0.3% of Ti,

0.0003% to 0.0900% of V,

0.0001 to 0.0100% of B,

0.001 to 0.050% of Zr, and

the balance of Ni with inevitable impurities.

2. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according to claim 1, wherein the composition further consists of, by mass %,

0.001% to 0.020% of Cu.

3. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according to claim 1, wherein the composition further consists of, by mass %,

0.001 to 0.100% of W.

4. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according to claim 1, wherein the composition further consists of, by mass %,

0.0001% or more and less than 0.0020% of Ca.

5. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according claim 1, wherein the composition further consists of, by mass %,

0.001% or more and less than 0.100% of Nb.

6. A member for a boiler of a thermal power station for use in a waste gas environment, made of the heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according to claim 1.

7. A member for a corrosion-resistant pressure vessel for use in a chemical plant, made of the heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according to claim 1.

8. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according to claim 2, wherein the composition further consists of, by mass %,

0.001 to 0.100% of W.

9. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according to claim 2, wherein the composition further consists of, by mass %,

0.0001% or more and less than 0.0020% of Ca.

10. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according to claim 3, wherein the composition further consists of, by mass %,

0.0001% or more and less than 0.0020% of Ca.

11. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according to claim 8, wherein the composition further consists of, by mass %,

0.0001% or more and less than 0.0020% of Ca.

12. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according claim 2, wherein the composition further consists of, by mass %,

0.001% or more and less than 0.100% of Nb.

13. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according claim 3, wherein the composition further consists of, by mass %,

0.001% or more and less than 0.100% of Nb.

14. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according claim 4, wherein the composition further consists of, by mass %,

0.001% or more and less than 0.100% of Nb.

15. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according claim 8, wherein the composition further consists of, by mass %,

0.001% or more and less than 0.100% of Nb.

16. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according claim 9, wherein the composition further consists of, by mass %,

0.001% or more and less than 0.100% of Nb.

17. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according claim 10, wherein the composition further consists of, by mass %,

0.001% or more and less than 0.100% of Nb.

18. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy having superior hot forgeability according claim 11, wherein the composition further consists of, by mass %,

0.001% or more and less than 0.100% of Nb.