# US 9,751,158 B2 · Stainless steel flux cored wire

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- Number: US 9,751,158 B2
- Document ID: US9751158B2
- Status: Granted
- Kind: B2
- Application number: 12/983,486
- Filed: 2011-01-03
- Published: 2011-07-28
- Granted: 2017-09-05
- Earliest claimed: 2010-01-27
- Assignees: Kobe Steel, Ltd.
- Applicants: Tetsunao Ikeda; Hiroshi Sugahara; Hirohisa Watanabe
- Inventors: Tetsunao Ikeda; Hiroshi Sugahara; Hirohisa Watanabe
- Web page: https://patentgrep.com/patent/US9751158B2

## CPC

- B23K 35/3066: {with Ni as next major constituent}
- B23K 35/0266: {flux-cored}
- B23K 35/22: characterised by the composition or nature of the material
- B23K 35/3033: {Ni as the principal constituent}
- B23K 35/304: {with Cr as the next major constituent}
- B23K 35/3605: {Fluorides}
- B23K 35/3607: {Silica or silicates}
- B23K 35/3608: {Titania or titanates}
- B23K 35/3616: {Halogen compounds}
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

In a stainless steel flux cored wire comprising a stainless steel shell and a flux filling the shell, the amount of Si contained in the entire wire is 2.5% by mass or higher, preferably 3.0% by mass or higher in terms of SiO2, and the amount of at least one compound selected from the group consisting of polytetrafluoroethylene, graphite fluoride and perfluoropolyether contained in the flux is 0.005 to 0.10% by mass of the total mass of the wire in terms of F, preferably 0.020% by mass or higher. By employing such a constitution, in welding of Cr—Ni-based and Cr-based stainless steels and other materials, fume generation and hexavalent chromium leaching can be significantly reduced, and excellent welding workability can be provided.

## Claims

### Claim 1

A stainless steel flux cored wire comprising a stainless steel shell and a flux filling the shell,
an amount of Si contained in the entire wire being 2.5% by mass or higher in terms of SiO2, and
a total amount of at least one compound selected from the group consisting of polytetrafluoroethylene, graphite fluoride and perfluoropolyether contained in the flux being 0.005 to 0.10% by mass of the total mass of the wire in terms of F.

### Claim 2 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein
the amount of at least one compound selected from the group consisting of polytetrafluoroethylene, graphite fluoride and perfluoropolyether contained is 0.020% by mass or higher of the total mass of the wire in terms of F.

### Claim 3 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein
a total amount of Na, K and Li in the flux is controlled to be 0.40% by mass or lower of the total mass of the wire.

### Claim 4 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein
the amount of Cr contained in the entire wire is 17.0 to 21.0% by mass, and the amount of Ni contained is 8.0 to 11.0% by mass.

### Claim 5 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein
the amount of Si contained is 3.0% by mass or higher in terms of SiO2.

### Claim 6 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein
the flux contains Ti oxide in an amount of 0.80% by mass or higher in terms of TiO2.

### Claim 7 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein
the wire contains Zr oxide and Al oxide in a total amount of 0.05 to 3.20% by mass in terms of ZrO2 and Al2O3.

### Claim 8 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein
the wire contains alkali metal fluoride in a total amount of 0.02 to 0.30% by mass in terms of F.

### Claim 9 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein the flux contains polytetrafluoroethylene.

### Claim 10 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein the flux contains graphite fluoride.

### Claim 11 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein the flux contains perfluoropolyether.

### Claim 12 (depends on 1)

The stainless steel flux cored wire according to claim 1, wherein the total amount of Na, K and Li is 0.06 to 0.50 by mass.