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

Patent metadata

Field	Value
Publication number	US-10458005-B2
Application number	US-201716076652-A
Country	US
Kind code	B2
Filing date	Feb 22, 2017
Priority date	Mar 15, 2016
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

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.

First claim

The invention claimed is:

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 %.

Assignees

• Hitachi Metals Ltd

Inventors

• Sugahara Katsuo

Classifications

• C22C19/05

  with chromium · CPC title

• F22B37/04

  and characterised by material, e.g. use of special steel alloy · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title

• C22C19/052 Primary

  with the maximum Cr content being at least 40% · CPC title