Ni-base alloy weld metal and Ni-base alloy covered electrode

Patent metadata

Field	Value
Publication number	US-9969033-B2
Application number	US-201113520583-A
Country	US
Kind code	B2
Filing date	Nov 4, 2011
Priority date	Dec 2, 2010
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

The contents of Cr, Fe, Mn, Ti, Si, Cu, N, Al, C, Mg, Mo, B, Zr, and Nb+Ta in a Ni-base alloy weld metal are properly specified and the contents of Co, P, and S in incidental impurities are controlled. In particular, a weld metal having high cracking resistance is formed by specifying the Mn content in a proper range and restricting the contents of B and Zr at low levels. Regarding a Ni-base alloy covered electrode, by specifying the contents of a slag-forming agent, a metal fluoride, and a carbonate serving as flux components in proper ranges and controlling the contents of Mn, Nb+Ta, and Fe in a flux, good welding workability is achieved and a weld metal having good bead appearance is formed.

First claim

The invention claimed is:

1. A Ni-base alloy covered electrode comprising a core wire composed of a Ni-base alloy and a covering material that contains a component of a flux and covers a periphery of the core wire,
wherein the core wire contains, relative to the total mass of the core wire,
Cr: 28.0 to 31.5% by mass,
Fe: 7.0 to 11.0% by mass,
Nb and Ta: 1.0 to 2.0% by mass in total,
C: 0.05% or less by mass,
Mn: 4.5 to 5.5% by mass,
N: 0.001 to 0.02% by mass,
Si: 0.70% or less by mass,
Mg: 0.0010% or less by mass,
Al: 0.50% or less by mass,
Ti: 0.50% or less by mass,
Mo: 0.50% or less by mass,
Cu: 0.50% or less by mass, and
Ni and incidental impurities;
wherein contents of B and Zr in the core wire are controlled to be 0.0010% or less by mass and 0.0010% or less by mass, respectively; and
contents of Co, P, and S in the incidental impurities are controlled to be 0.10% or less by mass, excluding zero, 0.015% or less by mass, and 0.015% or less by mass, respectively,
the covering material contains, as the component of a flux, a slag-forming agent: 3.5 to 6.5% by mass, a metal fluoride (in terms of F content): 2 to 5% by mass, and a carbonate (in terms of CO 2 content): 2.5 to 6.5% by mass relative to the total mass of the covered electrode; a Mn content in the flux is controlled to be 2.0% or less by mass; a total content of Nb and Ta in the flux is controlled to be 1.5% or less by mass; and a Fe content in the flux is controlled to be 2.5% or less by mass.

2. A Ni-base alloy covered electrode according to claim 1 , comprising a core wire composed of a Ni-base alloy and a covering material that contains a component of a flux and covers a periphery of the core wire,
wherein the core wire contains, relative to the total mass of the core wire,
Mn: 4.5 to 5.0% by mass.

3. A Ni-base alloy covered electrode according to claim 1 , comprising a core wire composed of a Ni-base alloy and a covering material that contains a component of a flux and covers a periphery of the core wire,
wherein the core wire contains, relative to the total mass of the core wire,
Mn: 4.60 to 5.18% by mass.

4. A Ni-base alloy covered electrode according to claim 3 , comprising a core wire composed of a Ni-base alloy and a covering material that contains a component of a flux and covers a periphery of the core wire,
wherein the core wire contains, relative to the total mass of the core wire,
Nb+Ta: 1.1 to 2.0% by mass.

5. A Ni-base alloy covered electrode according to claim 2 , comprising a core wire composed of a Ni-base alloy and a covering material that contains a component of a flux and covers a periphery of the core wire,
wherein the core wire has superior cracking resistance compared to the cracking resistance of the same Ni-base alloy having a Mn content of less than 4.5% by mass.

Assignees

• Kawamoto Hiroaki
• Watanabe Hirohisa
• Ikeda Tetsunao
• Sawada Yushi
• Kobe Steel Ltd

Inventors

• Kawamoto Hiroaki
• Watanabe Hirohisa
• Ikeda Tetsunao
• Sawada Yushi

Classifications

• B23K35/3033 Primary

  Ni as the principal constituent · CPC title

• Y10T428/2951

  Metal with weld modifying or stabilizing coating [e.g., flux, slag, producer, etc.] · CPC title

• B23K35/0261

  Rods, electrodes or wires · CPC title

• C22C19/055

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

• C22C19/053

  with the maximum Cr content being at least 30% but less than 40% · CPC title