Ni-based alloy

Patent metadata

Field	Value
Publication number	US-9932655-B2
Application number	US-201314402418-A
Country	US
Kind code	B2
Filing date	Jun 5, 2013
Priority date	Jun 7, 2012
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A Ni-based alloy includes, as a chemical composition, C, Si, Mn, Cr, Mo, Co, Al, Ti, B, P, S, and a balance consisting of Ni and impurities. The average grain size d is 10 μm to 300 μm, when the average grain size d is an average grain size in unit of μm of a γ phase included in a metallographic structure of the Ni-based alloy. Precipitates with a major axis of 100 nm or more are absent in the metallographic structure. An area fraction ρ is f2 or more, when the area fraction ρ and the f2 are expressed by using the average grain size d and amounts in mass % of each element in the chemical composition.

First claim

The invention claimed is:

1. A Ni-based alloy comprising, as a chemical composition, by mass %,
0.001% to 0.15% of C,
0.01% to 2% of Si,
0.01% to 3% of Mn,
15% to less than 28% of Cr,
3% to 15% of Mo,
more than 5% to 25% of Co,
0.2% to 2% of Al,
0.2% to 3% of Ti,
0.0005% to 0.01% of B,
0% to 3.0% of Nb,
0% to 15% of W,
0% to 0.2% of Zr,
0% to 8% of Ta,
0% to 8% of Re,
0% to 15% of Fe,
f1 expressed by a following Expression 1 or less of P,
0.01% or less of S,
at least one selected from
0.005% to 1% of Hf,
0.0005% to 0.05% of Mg,
0.0005% to 0.05% of Ca,
0.0005% to 0.5% of Y,
0.0005% to 0.5% of La,
0.0005% to 0.5% of Ce,
0.0005% to 0.5% of Nd, and
a balance consisting of Ni and impurities,
wherein, an average grain size d is an average grain size in unit of μm of a γ phase included in a metallographic structure of the Ni-based alloy, and the average grain size d is 10 μm to 300 μm,
wherein precipitates with a major axis of 100 nm or more are absent in the metallographic structure, and
wherein, an area fraction ρ is expressed by a following Expression 2 using the average grain size d and amounts in unit of mass % of each element in the chemical composition, and the area fraction ρ is f2 expressed by a following Expression 3 or more,
f 1=0.01−0.012/[1+exp{( B− 0.0015)/0.001}]  (Expression 1)

ρ=21 ×d 0.15 +40×(500 ×B/ 10.81+50 ×C/ 12.01+Cr/52.00) 0.3   (Expression 2)

f 2=32 ×d 0.07 +115×(Al/26.98+Ti/47.88+Nb/92.91) 0.5   (Expression 3).

2. The Ni-based alloy according to claim 1 comprising, as the chemical composition, by mass %,
0.05% to 3.0% of Nb.

3. A Ni-based alloy tube comprising a Ni-based alloy according to claim 2 for a production thereof.

4. The Ni-based alloy according to claim 2 comprising, as the chemical composition, by mass %, at least one selected from
0.005% to 0.2% of Zr,
0.01% to 8% of Ta,
0.01% to 8% of Re, and
1.5% to 15% of Fe.

5. A Ni-based alloy tube comprising a Ni-based alloy according to claim 4 for a production thereof.

6. The Ni-based alloy according to claim 2 comprising, as the chemical composition, by mass %,
1% to 15% of W.

7. A Ni-based alloy tube comprising a Ni-based alloy according to claim 6 for a production thereof.

8. The Ni-based alloy according to claim 6 comprising, as the chemical composition, by mass %, at least one selected from
0.005% to 0.2% of Zr,
0.01% to 8% of Ta,
0.01% to 8% of Re, and
1.5% to 15% of Fe.

9. A Ni-based alloy tube comprising a Ni-based alloy according to claim 8 for a production thereof.

10. The Ni-based alloy according to claim 1 comprising, as the chemical composition, by mass %,
1% to 15% of W.

11. The Ni-based alloy according to claim 10 comprising, as the chemical composition, by mass %, at least one selected from
0.005% to 0.2% of Zr,
0.01% to 8% of Ta,
0.01% to 8% of Re, and
1.5% to 15% of Fe.

12. A Ni-based alloy tube comprising a Ni-based alloy according to claim 11 for a production thereof.

13. A Ni-based alloy tube comprising a Ni-based alloy according to claim 10 for a production thereof.

14. The Ni-based alloy according to claim 1 comprising, as the chemical composition, by mass %, at least one selected from
0.005% to 0.2% of Zr,
0.01% to 8% of Ta,
0.01% to 8% of Re, and
1.5% to 15% of Fe.

15. A Ni-based alloy tube comprising a Ni-based alloy according to claim 14 for a production thereof.

16. A Ni-based alloy tube comprising a Ni-based alloy according to claim 1 for a production thereof.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• HAMAGUCHI Tomoaki
• Semba Hiroyuki
• Okada Hirokazu

Classifications

• C22C30/00

  Alloys containing less than 50% by weight of each constituent · CPC title

• C22C19/056 Primary

  with the maximum Cr content being at least 10% but less than 20% · CPC title

• C22C19/055 Primary

  with the maximum Cr content being at least 20% but less than 30% · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title

• C22C19/05

  with chromium · CPC title