Austenitic stainless steel weld metal and welded structure

Patent metadata

Field	Value
Publication number	US-2020239986-A1
Application number	US-201816753182-A
Country	US
Kind code	A1
Filing date	Oct 3, 2018
Priority date	Oct 3, 2017
Publication date	Jul 30, 2020
Grant date	—

Abstract

An austenitic stainless steel weld metal which has a chemical composition consisting of, by mass %, C: 0.05 to 0.11%, Si: 0.10 to 0.50%, Mn: 1.0 to 2.5%, P: 0.035% or less, S: 0.0030% or less, Co: 0.01 to 1.00%, Ni: 9.0 to 11.5%, Cr: 17.0 to 21.0%, Nb: 0.60 to 0.90%, Ta: 0.001 to 0.100%, N: 0.01 to 0.15%, Al: 0.030% or less, O: 0.020% or less, V: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, Mo: 0 to 0.50%, Cu: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [Nb-7.8×C≤0.25].

First claim

1 . An austenitic stainless steel weld metal having a chemical composition consisting of, by mass %,
C: 0.05 to 0.11%, Si: 0.10 to 0.50%, Mn: 1.0 to 2.5%, P: 0.035% or less, S: 0.0030% or less, Co: 0.01 to 1.00%, Ni: 9.0 to 11.5%, Cr: 17.0 to 21.0%, Nb: 0.60 to 0.90%, Ta: 0.001 to 0.100%, N: 0.01 to 0.15%, Al: 0.030% or less, O: 0.020% or less, V: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, Mo: 0 to 0.50%, Cu: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010%, REM: 0 to 0.10%, and the balance: Fe and impurities, and satisfying formula (i) below:
Nb-7.8×C≤0.25  (i)

where, each symbol of an element in the above formulas represents a content (mass %) of a corresponding element contained in the steel.

2 . The austenitic stainless steel weld metal according to claim 1 , wherein the chemical composition contains, by mass %:
V: 0.01 to 0.10%, Ti: 0.01 to 0.10%, W: 0.01 to 0.50%, Mo: 0.01 to 0.50%, Cu: 0.01 to 0.50%, B: 0.0002 to 0.005%, Ca: 0.0005 to 0.010%, Mg: 0.0005 to 0.010%, and REM: 0.0005 to 0.10%.

3 . A welded structure having the austenitic stainless steel weld metal according to claim 1 .

4 . A welded structure having the austenitic stainless steel weld metal according to claim 2 .

Assignees

• Nippon Steel Corp

Inventors

• Hirata Hiroyuki
• Jotoku Kana
• Tanaka Katsuki

Classifications

• B23K35/3086 Primary

  containing Ni or Mn · CPC title

• C22C38/54

  with boron · CPC title

• C22C38/001

  containing N · CPC title

• C22C38/005

  containing rare earths, i.e. Sc, Y, Lanthanides · CPC title

• C22C38/58 Primary

  with more than 1.5% by weight of manganese · CPC title