Heat-resistant and corrosion-resistant high-chromium nickel-based alloy with superior hot forgeability

• US 10,458,005 B2
• Filed: 02/22/2017
• Issued: 10/29/2019
• Est. Priority Date: 03/15/2016
• Status: Active Grant

• Current Assignee: Hitachi Metals (Thailand) Ltd.
• Original Assignee: Hitachi Metals (Thailand) Ltd.
• Inventors: Sugahara, Katsuo
• Primary Examiner(s): Roe, Jessee R
• Application Number:
  US16/076,652
• Publication Number:
  US 20190062877A1
• Time in Patent Office: 979 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 suitable for 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,

optionally 0.001% to 0.020% of Cu,

optionally 0.001% to 0.100% of W,

optionally 0.0001% to less than 0.0020% of Ca,

optionally 0.001% to less than 0.100% of Nb, and

the balance of Ni with inevitable impurities.

2. 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 according to claim 1.

3. 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 according to claim 1.

4. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according claim 1, wherein niobium is present in an amount of 0.001% to less than 0.100% by mass %.

5. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according to claim 1, wherein calcium is present in an amount of 0.0001% to less than 0.0020% by mass %.

6. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according claim 5, wherein niobium is present in an amount of 0.001% or to less than 0.100% by mass %.

7. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according to claim 1, wherein copper is present in an amount of 0.001% to 0.020% by mass %.

8. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according claim 7, wherein niobium is present in an amount of 0.001% to less than 0.100% by mass %.

9. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according to claim 7, wherein tungsten is present in an amount of 0.001% to 0.100% by mass %.

10. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according to claim 9, wherein calcium is present in an amount of 0.0001% to less than 0.0020% by mass %.

11. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according claim 10, wherein niobium is present in an amount of 0.001% to less than 0.100% by mass %.

12. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according claim 9, wherein niobium is present in an amount of 0.001% to less than 0.100% by mass %.

13. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according to claim 7, wherein calcium is present in an amount of 0.0001% to less than 0.0020% by mass %.

14. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according claim 13, wherein niobium is present in an amount of 0.001% to less than 0.100% by mass %.

15. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according to claim 1, wherein tungsten is present in an amount of 0.001% to 0.100% by mass %.

16. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according to claim 15, wherein calcium is present in an amount of 0.0001% to less than 0.0020% by mass %.

17. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according claim 16, wherein niobium is present in an amount of 0.001% to less than 0.100% by mass %.

18. The heat-resistant and corrosion-resistant high-Cr-containing Ni-based alloy according claim 15, wherein niobium is present in an amount of 0.001% to less than 0.100% by mass %.