# US 10,369,666 B2 · Stainless steel flux-cored wire

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- Number: US 10,369,666 B2
- Document ID: US10369666B2
- Status: Granted
- Kind: B2
- Application number: 13/342,461
- Filed: 2012-01-03
- Published: 2012-09-06
- Granted: 2019-08-06
- Earliest claimed: 2011-03-01
- Assignees: Kobe Steel, Ltd.
- Applicants: Hiroshi Sugahara; Tetsunao Ikeda; Hirohisa Watanabe
- Inventors: Hiroshi Sugahara; Tetsunao Ikeda; Hirohisa Watanabe
- Web page: https://patentgrep.com/patent/US10369666B2

## CPC

- B23K 35/0266: {flux-cored}
- B23K 35/308: {with Cr as next major constituent}
- B23K 35/3601: {with inorganic compounds as principal constituents}
- B23K 35/362: Selection of compositions of fluxes (B23K35/365, B23K35/368 take precedence)
- 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

It is an object to provide a stainless steel flux-cored wire in which the amount of hexavalent chromium in fume can be reduced while maintaining the weldability excellent. The stainless steel flux-cored wire contains, as percentage to the total mass of the wire: Cr: 11-30 mass %; metal Si, Si oxide and Si compound: 0.5-4.0 mass % in total in terms of Si [Si]; fluorine compound: 0.01-1.0 mass % in terms of F [F]; TiO2: 1.5 mass % or above; ZrO2+Al2O3: 3.2 mass % or below; Na compound, K compound and Li compound: 0.50 mass % or below in total of each of an amount in terms of Na [Na], an amount in terms of K [K] and an amount in terms of Li [Li]; and satisfies {([Na]+[K]+[Li])×[Cr]2}/([Si]+4.7×[F])≤10, where [Cr] represents Cr content.

## Claims

### Claim 1

A flux-cored wire for arc welding filled up with flux in an outer sheath made of stainless steel containing, as percentage to the total mass of the wire:
Cr: 11-30 mass %;
metal Si, Si oxide and Si compound: 1.1-4.0 mass % in total in terms of Si [Si];
fluorine compound: 0.01-1.0 mass % in terms of F [F];
TiO2: 1.5 mass % or above;
ZrO2+Al2O3: 3.2 mass % or below;
Na compound, K compound and Li compound: 0.50 mass % or below in total of each of an amount in terms of Na [Na], an amount in tell is of K [K] and an amount in terms of Li [Li]; wherein,
when [Cr] represents Cr content (mass %),
{([Na]+[K]+[Li])×[Cr]2}/([Si]+4.7×[F])≤10
is satisfied.

### Claim 2 (depends on 1)

The flux-cored wire for arc welding filled up with flux in an outer sheath made of stainless steel according to claim 1, wherein
{([Na]+[K]+[Li])×[Cr]2}/([Si]+4.7×[F])≤9.3
is satisfied.

### Claim 3 (depends on 1)

The flux-cored wire for arc welding filled up with flux in an outer sheath made of stainless steel according to claim 1, wherein
{([Na]+[K]+[Li])×[Cr]2}/([Si]+4.7×[F])≤9.1
is satisfied.

### Claim 4 (depends on 1)

The flux-cored wire for arc welding filled up with flux in an outer sheath made of stainless steel according to claim 1, wherein:
Cr: 11-24 mass %.

### Claim 5 (depends on 1)

The flux-cored wire for arc welding filled up with flux in an outer sheath made of stainless steel according to claim 1, wherein:
Cr: 11-22 mass %.

### Claim 6

A flux-cored wire for arc welding filled up with flux in an outer sheath made of stainless steel containing, as percentage to the total mass of the wire:
Cr: 11-22 mass %;
metal Si, Si oxide and Si compound: 0.5-4.0 mass % in total in terms of Si [Si];
fluorine compound: 0.01-1.0 mass % in terms of F [F];
TiO2: 1.5 mass % or above;
ZrO2÷Al2O3: 3.2 mass % or below;
Na compound, K compound and Li compound: 0.50 mass % or below in total of each of an amount in terms of Na [Na], an amount in terms of K [K] and an amount in terms of Li [Li]; wherein, when [Cr] represents Cr content (mass %),
{([Na]+[K]+[Li])×[Cr]2}/([Si]+4.7×[F])≤10
is satisfied.

### Claim 7 (depends on 6)

The flux-cored wire for arc welding filled up with flux in an outer sheath made of stainless steel according to claim 6, wherein
{([Na]+[K]+[Li])×[Cr]2}/([Si]+4.7×[F])≤9.3
is satisfied.

### Claim 8 (depends on 6)

The flux-cored wire for arc welding filled up with flux in an outer sheath made of stainless steel according to claim 6, wherein
{([Na]+[K]+[Li])×[Cr]2}/([Si]+4.7×[F])≤9.1
is satisfied.

### Claim 9 (depends on 6)

The flux-cored wire for arc welding filled up with flux in an outer sheath made of stainless steel according to claim 6, wherein:
metal Si, Si oxide and Si compound: 1.0-4.0 mass % in total in terms of Si [Si].