Welded joint

Patent metadata

Field	Value
Publication number	US-10378091-B2
Application number	US-201515117462-A
Country	US
Kind code	B2
Filing date	Feb 23, 2015
Priority date	Feb 26, 2014
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

A welded joint is obtained by using a welding material having a composition: Cr: 15.0 to 30.0%; and Ni: 40.0 to 70.0%, including: a base material having a composition: C: 0.03 to 0.075%; Si: 0.6 to 2.0%; Mn: 0.05 to 2.5%; P: up to 0.04%; S: up to 0.015%; Cr: more than 16.0% and less than 23.0%; Ni: not less than 20.0% and less than 30.0%; Cu: 0.5 to 10.0%; Mo: less than 1%; Al: up to 0.15%; N: 0.005 to 0.20%; O: up to 0.02%; Ca: 0 to 0.1%; REM: 0 to 0.15%; V: not less than 0% and less than 0.5%; and Nb: 0 to 2%, a balance being Fe and impurities and a first-layer weld metal including Fe content from 10 to 40%, all % by mass.

First claim

The invention claimed is:

1. A welded joint obtained by welding using a welding material having a chemical composition including, in mass %, Cr: 15.0 to 35.0%; and Ni: 40.0 to 70.0%, comprising:
a base material having a chemical composition of, in mass %:
C: 0.03 to 0.075%;
Si: 0.6 to 2.0%;
Mn: 0.05 to 2.5%;
P: up to 0.04%;
S: up to 0.015%;
Cr: more than 16.0% and less than 23.0%;
Ni: not less than 20.0% and less than 30.0%;
Cu: 0.5 to 10.0%;
Mo: less than 1%;
Al: up to 0.15%;
N: 0.005 to 0.20%;
O: up to 0.02%;
Ca: 0 to 0.1%;
REM: 0 to 0.15%;
V: not less than 0% and less than 0.5%; and
Nb: 0 to 2%,
a balance being Fe and impurities; and
a first-layer weld metal having a chemical composition including, in mass %, an Fe content ranging from 10 to 40%.

2. The welded joint according to claim 1 , wherein the base material has a chemical composition including, in mass %, one or two selected from the group consisting of:
Ca: 0.005 to 0.1%; and
REM: 0.005 to 0.15%.

3. The welded joint according to claim 1 , wherein the base material has a chemical composition including, in mass %, one or two selected from the group consisting of:
V: not less than 0.002% and less than 0.5%; and
Nb: 0.005 to 0.15%.

4. The welded joint according to claim 1 , wherein the first-layer weld metal has a chemical composition of, in mass %:
C: 0.01 to 0.15%;
Si: 0.01 to 4.0%;
Mn: 0.05 to 3.0%;
P: up to 0.03%;
S: up to 0.015%;
Cr: more than 16.0% and less than 32.0%;
Ni: not less than 20.0%;
Cu: 0.03 to 5.0%;
Al: up to 1.0%;
N: 0.005 to 0.2%;
O: up to 0.02%;
Ti: 0 to 0.5%;
Mo: 0 to 8%;
Nb: 0 to 3%;
Co: 0 to 15%; and
Fe: 10 to 40%,
a balance being impurities.

5. The welded joint according to claim 1 , wherein the welding material has a chemical composition of, in mass %:
C: 0.01 to 0.15%;
Si: up to 4.0%;
Mn: 0.01 to 3.5%;
P: up to 0.03%;
S: up to 0.015%;
Cr: 15.0 to 35.0%;
Ni: 40.0 to 70.0%;
Cu: 0.01 to 4.0%;
Al: 0 to 1.5%;
N: 0.005 to 0.1%;
O: up to 0.03%;
Ti: 0 to 1.0%;
Mo: 0 to 15%;
Nb: 0 to 5%; and
Co: 0 to 15%,
a balance being Fe and impurities.

6. The welded joint according to claim 5 , wherein the welding material has a chemical composition including, in mass %:
Al: 0.15 to 1.5%;
Ti: 0.15 to 1.0%; and
Mo: 7 to 15%,
the chemical composition of the welding material further including at least one of Nb: 0.1 to 5% and Co: 0.1 to 15%.

7. The welded joint according to claim 5 , wherein the welding material has a chemical composition including, in mass %:
Si: 0.5 to 4.0%.

8. A welded joint comprising:
a base material having a chemical composition of, in mass %:
C: 0.03 to 0.075%;
Si: 0.6 to 2.0%;
Mn: 0.05 to 2.5%;
P: up to 0.04%;
S: up to 0.015%;
Cr: more than 16.0% and less than 23.0%;
Ni: not less than 20.0% and less than 30.0%;
Cu: 0.5 to 10.0%;
Mo: less than 1%;
Al: up to 0.15%;
N: 0.005 to 0.20%;
O: up to 0.02%;
Ca: 0 to 0.1%;
REM: 0 to 0.15%;
V: not less than 0% and less than 0.5%; and
Nb: 0 to 2%,
a balance being Fe and impurities; and
a first-layer weld metal having a chemical composition of, in mass %:
C: 0.01 to 0.15%;
Si: 0.01 to 4.0%;
Mn: 0.05 to 3.0%;
P: up to 0.03%;
S: up to 0.015%;
Cr: more than 16.0% and less than 32.0%;
Ni: not less than 20.0%;
Cu: 0.03 to 5.0%;
Al: up to 1.0%;
N: 0.005 to 0.2%;
O: up to 0.02%;
Ti: 0 to 0.5%;
Mo: 0 to 8%;
Nb: 0 to 3%;
Co: 0 to 15%; and
Fe: 10 to 40%,
a balance being impurities.

9. A method of manufacturing a welded joint, comprising the steps of:
preparing a base material having a chemical composition of, in mass %:
C: 0.03 to 0.075%;
Si: 0.6 to 2.0%;
Mn: 0.05 to 2.5%;
P: up to 0.04%;
S: up to 0.015%;
Cr: more than 16.0% and less than 23.0%;
Ni: not less than 20.0% and less than 30.0%;
Cu: 0.5 to 10.0%;
Mo: less than 1%;
Al: up to 0.15%;
N: 0.005 to 0.20%;
O: up to 0.02%;
Ca: 0 to 0.1%;
REM: 0 to 0.15%;
V: not less than 0% and less than 0.5%; and
Nb: 0 to 2%,
a balance being Fe and impurities; and
welding the base material using a welding material having a chemical composition including, in mass %, Cr: 15.0 to 35.0%; and Ni: 40.0 to 70.0%,
wherein the welded joint includes a first-layer weld metal having a chemical composition including, in mass %, an Fe content ranging from 10 to 40%.

10. The method of manufacturing the welded joint according to claim 9 , wherein the first-layer weld metal has a chemical composition of, in mass %:
C: 0.01 to 0.15%;
Si: 0.01 to 4.0%;
Mn: 0.05 to 3.0%;
P: up to 0.03%;
S: up to 0.015%;
Cr: more than 16.0% and less than 32.0%;
Ni: not less than 20.0%;
Cu: 0.03 to 5.0%;
Al: up to 1.0%;
N: 0.005 to 0.2%;
O: up to 0.02%;
Ti: 0 to 0.5%;
Mo: 0 to 8%;
Nb: 0 to 3%;
Co: 0 to 15%; and
Fe: 10 to 40%,
a balance being impurities.

11. The method of manufacturing the welded joint according claim 9 , wherein the welding material has a chemical composition of, in mass %:
C: 0.01 to 0.15%;
Si: up to 4.0%;
Mn: 0.01 to 3.5%;
P: up to 0.03%;
S: up to 0.015%;
Cr: 15.0 to 35.0%;
Ni: 40.0 to 70.0%;
Cu: 0.01 to 4.0%;
Al: 0 to 1.5%;
N: 0.005 to 0.1%;
O: up to 0.03%;
Ti: 0 to 1.0%;
Mo: 0 to 15%;
Nb: 0 to 5%; and
Co: 0 to 15%,
a balance being Fe and impurities.

Assignees

• Nippon Steel & Sumitomo Metal Corp
• Nippon Steel Corp

Inventors

• Jotoku Kana
• Hirata Hiroyuki
• Nishiyama Yoshitaka
• Okada Hirokazu
• Kurihara Shinnosuke
• Suzuki Yuhei

Classifications

• C22C38/42

  with copper · CPC title

• C22C38/06

  containing aluminium · CPC title

• B23K35/0261

  Rods, electrodes or wires · CPC title

• C22C19/056

  with the maximum Cr content being at least 10% but less than 20% · CPC title

• B23K35/30 Primary

  with the principal constituent melting at less than 1550°C · CPC title