Ni-BASED ALLOY HAVING EXCELLENT HOT FORGEABILITY AND CORROSION RESISTANCE, AND LARGE STRUCTURAL MEMBER

• US 20160333444A1
• Filed: 07/14/2014
• Published: 11/17/2016
• Est. Priority Date: 02/26/2014
• Status: Active Grant

• Current Assignee: Hitachi Metals (Thailand) Ltd., Hitachi Metals MMC Superalloy, Ltd. (Proterial Ltd.)
• Original Assignee: Hitachi Metals (Thailand) Ltd., Hitachi Metals MMC Superalloy, Ltd. (Proterial Ltd.)
• Inventors: Sugahara, Katsuo
• Granted Patent: US 9,809,873 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C22C 19/05 with chromium
• CPC Class Codes: C22C 19/055 with the maximum Cr content being at least 20% but less than 30%
• CPC Class Codes: C22C 19/056 with the maximum Cr content being at least 10% but less than 20%

Abstract

A Ni-based alloy having excellent hot forgeability and corrosion resistance includes, by mass %, Cr: more than 18% to less than 21%, Mo: more than 18% to less than 21%, Ta: 1.1% to 2.5%, Mg: 0.001% to 0.05%, N: 0.001% to 0.04%, Mn: 0.001% to 0.5%, Si: 0.001% to 0.05%, Fe: 0.01% to 1%, Co: 0.01% or more and less than 1%, Al: 0.01% to 0.5%, Ti: 0.01% or more and less than 0.1%, V: 0.005% or more and less than 0.1%, Nb: 0.001% or more and less than 0.1%, B: 0.0001% to 0.01%, Zr: 0.001% to 0.05%, and a balance consisting of Ni and unavoidable impurities.

Claims

1. A Ni-based alloy having excellent hot forgeability and corrosion resistance comprising, by mass %:

Cr;

more than 18% to less than 21%;

Mo;

more than 18% to less than 21%;

Ta;

1.1% to 2.5%;

Mg;

0.001% to 0.05%;

N;

0.001% to 0.04%;

Mn;

0.001% to 0.5%;

Si;

0.001% to 0.05%;

Fe;

0.01% to 1%;

Co;

0.01% or more and less than 1%;

Al;

0.01% to 0.5%;

Ti;

0.01% or more and less than 0.1%;

V;

0.005% or more and less than 0.1%;

Nb;

0.001% or more and less than 0.1%;

B;

0.0001% to 0.01%;

Zr;

0.001% to 0.05%; and

a balance consisting of Ni and unavoidable impurities.

2. The Ni-based alloy having excellent hot forgeability and corrosion resistance according to claim 1 further comprising, by mass %, one or more of

Cu:

0.001% or more and less than 0.1%, and

W;

0.001% or more and less than 0.1%.

3. The Ni-based alloy having excellent hot forgeability and corrosion resistance according to claim 1 further comprising, by mass %,

Ca:

0.001% or more and less than 0.05%.

4. The Ni-based alloy having excellent hot forgeability and corrosion resistance according to any one of claim 1 further comprising, by mass %,

Hf:

0.001% or more and less than 0.05%.

5. A large structural member formed by the Ni-based alloy having excellent hot forgeability and corrosion resistance according to claim 1.