# US 2021/0340652 A1 · Solid wire and method of manufacturing welded joint

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- Number: US 2021/0340652 A1
- Document ID: US20210340652A1
- Status: Published application
- Kind: A1
- Application number: 17/261,517
- Filed: 2019-04-10
- Published: 2021-11-04
- Earliest claimed: 2019-04-10
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel Corporation
- Inventors: Suo SARUWATARI
- Web page: https://patentgrep.com/patent/US20210340652A1

## CPC

- B23K 9/025: for rectilinear seams
- C22C 38/58: with more than 1.5% by weight of manganese
- B23K 9/173: and of a consumable electrode
- B23K 9/23: taking account of the properties of the materials to be welded
- B23K 35/0261: {Rods, electrodes or wires}
- B23K 35/3066: {with Ni as next major constituent}
- B23K 35/383: {mainly containing noble gases or nitrogen}
- C22C 38/005: {containing rare earths, i.e. Sc, Y, Lanthanides}
- C22C 38/02: containing silicon
- C22C 38/06: containing aluminium
- C22C 38/42: with copper
- C22C 38/44: with molybdenum or tungsten
- C22C 38/46: with vanadium
- C22C 38/48: with niobium or tantalum
- C22C 38/50: with titanium or zirconium
- C22C 38/54: with boron
- B23K 35/30: with the principal constituent melting at less than 1550°C
- B23K 2101/32: Wires
- B23K 2103/04: Steel {or steel} alloys
- C22C 38/04: containing manganese
- C22C 38/08: containing nickel {(C22C38/105 takes precedence)}
- C22C 38/12: containing tungsten, tantalum, molybdenum, vanadium, or niobium
- C22C 38/14: containing titanium or zirconium
- C22C 38/40: with nickel
- 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
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A solid wire according to an aspect of the present invention contains, as a chemical composition: C: 0.003% to 0.080%; Si: 0.0010% to 0.50%; Mn: 0.050% to 1.80%; Al: 0.030% to 0.500%; Ni: 8.0% to 16.0%; P: 0.0200% or less; S: 0.0100% or less; O: 0.050% or less; Ta: 0% to 0.1000%; Cu: 0% to 0.5%; Cr: 0% to 0.5%; Mo: 0% to 0.5%; V: 0% to 0.20%; Ti: 0% to 0.10%; Nb: 0% to 0.10%; B: 0% to 0.010%; Mg: 0% to 0.80%; REM: 0% to 0.050%; and a remainder: Fe and impurities, a is 1.35% to 5.50%, and Ceq is 0.250% to 0.520%.

## Claims

### Claim 1

A solid wire comprising, as a chemical composition, by mass % with respect to a total mass of the solid wire:
C: 0.003% to 0.080%;
Si: 0.0010% to 0.50%;
Mn: 0.050% to 1.80%;
Al: 0.030% to 0.500%;
Ni: 8.0% to 16.0%;
P: 0.0200% or less;
S: 0.0100% or less;
O: 0.050% or less;
Ta: 0% to 0.1000%;
Cu: 0% to 0.5%;
Cr: 0% to 0.5%;
Mo: 0% to 0.5%;
V: 0% to 0.20%;
Ti: 0% to 0.10%;
Nb: 0% to 0.10%;
B: 0% to 0.010%;
Mg: 0% to 0.80%;
REM: 0% to 0.050%; and
a remainder: Fe and impurities,
wherein α defined by Formula a described below is 1.35% to 5.50%, and
Ceq defined by Formula b described below is 0.250% to 0.520%,
α=2×[Mn]+[Al]+1.5×[Ti]+[Mg]+10×[Ta] (Formula a)
Ceq=[C]+[Si]/24+[Mn]/6+[Ni]/40+[Cr]/5+[Mo]/4+[V]/14 (Formula b)
in Formulae a and b, each element with [ ] indicates an amount of the element by mass % with respect to the total mass of the solid wire.

### Claim 2 (depends on 1)

The solid wire according to claim 1,
wherein the chemical composition contains, by mass % with respect to the total mass of the solid wire, one or more of:
Ta: 0.0005% to 0.1000%;
Cu: 0.1% to 0.5%;
Cr: 0.01% to 0.5%;
Mo: 0.01% to 0.5%;
V: 0.01% to 0.20%;
Ti: 0.005% to 0.10%;
Nb: 0.002% to 0.10%;
B: 0.0003% to 0.010%;
Mg: 0.10% to 0.80%; and
REM: 0.001% to 0.050%.

### Claim 3 (depends on 1)

The solid wire according to claim 1,
wherein an amount of the REM in the solid wire is 0.010% or less by mass % with respect to the total mass of the solid wire.

### Claim 4 (depends on 1)

The solid wire according to claim 1,
wherein a surface has perfluoropolyether oil thereon.

### Claim 5 (depends on 1)

The solid wire according to claim 1,
wherein a tensile strength is 500 MPa to 1,000 MPa.

### Claim 6 (depends on 1)

A method of manufacturing a welded joint, comprising:
welding a steel material using the solid wire according to claim 1.

### Claim 7 (depends on 6)

The method of manufacturing a welded joint according to claim 6,
wherein the steel material has
a thickness of 6 mm to 100 mm,
a Ni content of 5.5 mass % to 9.5 mass %, and
a tensile strength of 660 MPa to 900 MPa.

### Claim 8 (depends on 6)

The method of manufacturing a welded joint according to claim 6,
wherein the welding is gas shielded arc welding.

### Claim 9 (depends on 8)

The method of manufacturing a welded joint according to claim 8,
wherein a shielding gas is any one of a pure Ar gas, a pure He gas, a gas containing Ar and 20 vol % or less of one or both of O2 and CO2, and a gas containing He and 20 vol % or less of one or both of O2 and CO2.