Weld metal and welded structure provided with same

Patent metadata

Field	Value
Publication number	US-2016008931-A1
Application number	US-201414769611-A
Country	US
Kind code	A1
Filing date	Feb 24, 2014
Priority date	Mar 8, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

This welded metal contains 0.02-0.10% of C, 0.10-0.60% of Si, 0.90-2.5% of Mn, 0.20-2.00% of Ni, 0.05-1.0% of Cr, 0.10-1.50% of Mo, 0.040-0.15% of Ti, 0.0010-0.0050% of B, 0.030-0.100% of O and 0.015% or less (excluding 0%) of N, with the balance made up of iron and unavoidable impurities. The average circle-equivalent diameter of carbides having a circle-equivalent diameter of 0.40 μm or more among the carbides present in the grain boundary of this welded metal is 0.75 μm or less. Consequently, the present invention provides: a welded metal which exhibits excellent low-temperature toughness at lower temperatures, while having high strength after SR annealing, even in cases where gas sealed arc welding using a flux cored wire and having excellent work efficiency is applied; and a welded structure which is provided with this welded metal.

First claim

1 . A weld metal, comprising:
C: 0.02 to 0.10 mass %; Si: 0.10 to 0.60 mass %; Mn: 0.90 to 2.5 mass %; Ni: 0.20 to 2.00 mass %; Cr: 0.05 to 1.0 mass %; Mo: 0.10 to 1.50 mass %; Ti: 0.040 to 0.15 mass %; B: 0.0010 to 0.0050 mass %; O: 0.030 to 0.100 mass %; N: 0.015 mass % or less (excluding 0%); and iron and unavoidable impurities, wherein an average circle equivalent diameter of carbides having a circle equivalent diameter of 0.40 μm or more among the carbides present in the grain boundary of the weld metal is 0.75 μm or less.

2 . The weld metal according to claim 1 , further comprising: wherein at least one of
Cu: 1.0 mass % or less (not including 0%); and V: 0.40 mass % or less (not including 0%).

3 . The weld metal according to claim 1 , further comprising:
Al: 0.030 mass % or less (not including 0%).

4 . The weld metal according to claim 2 , further comprising:
Al: 0.030 mass % or less (not including 0%).

5 . A welded structure provided with the weld metal according to claim 1 .

Assignees

• Kobe Steel Ltd

Inventors

• Nako Hidenori
• Kochi Takuya
• Urushihara Wataru
• Kawasaki Hiroyuki
• Han Peng
• Kitagawa Yoshihiko
• Okazaki Yoshitomi

Classifications

• C22C38/002

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• C22C38/54

  with boron · CPC title

• C22C38/50

  with titanium or zirconium · CPC title

• C22C38/46

  with vanadium · CPC title

• C22C38/44

  with molybdenum or tungsten · CPC title