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Weld metals with superior low temperature toughness and used for joining high strength low alloy steels

A technology of weld metal and alloy elements, which is applied in the field of weld metal, can solve the problem of suboptimal pipelines, achieve good hydrogen-induced cracking resistance, excellent low-temperature toughness, and avoid hydrogen-induced cracking effects

Inactive Publication Date: 2005-12-21
EXXONMOBIL UPSTREAM RES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] While the LCBF weld metal described in U.S. Patent 5,523,540 may be suitable for joining HSLA steel for ship shells, the LCBF weld metal is not optimal for pipelines requiring a girth weld yield strength of at least about 690 MPa (100 ksi)

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  • Weld metals with superior low temperature toughness and used for joining high strength low alloy steels
  • Weld metals with superior low temperature toughness and used for joining high strength low alloy steels
  • Weld metals with superior low temperature toughness and used for joining high strength low alloy steels

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Embodiment Construction

[0046] A weld metal is provided comprising: iron, about 0.04-0.08 wt% carbon, about 1.0-2.0 wt% manganese, about 0.2-0.7 wt% silicon, about 0.30-0.80 wt% molybdenum, about 2.3 - 3.5% by weight nickel, about 0.0175-0.0400% by weight oxygen, and at least one of the following additional elements: up to about 0.04% by weight zirconium and up to about 0.02% by weight titanium. The weld metal according to the present invention may also contain less than about 0.01% by weight phosphorus, less than about 0.01% by weight sulfur, up to about 0.03% by weight aluminum and less than about 0.020% by weight nitrogen. Additionally, the weld metal may contain at least one of up to about 0.60% by weight chromium, up to about 0.60% by weight copper, up to about 0.040% by weight vanadium, and up to about 0.0012% by weight boron. Given the chemical composition of the desired weld metal and the chemical composition of the steel to be welded, one skilled in the art can use known methods to determine...

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Abstract

Provides weld metal suitable for joining high-strength, low-alloy steels. In the microstructure of the weld metal, acicular ferrite (16') is dispersed in hard components (11') such as lath martensite, and its yield strength is at least about 690MPa (100ksi), which is determined by Charpy V shape Notch energy vs. temperature curves have a DBTT of less than about -50°C (-58°F). The weld metal contains about 0.04-0.08 wt% carbon; about 1.0-2.0 wt% manganese; about 0.2-0.7 wt% silicon; about 0.30-0.80 wt% molybdenum; about 2.3-3.5 wt% nickel; weight percent oxygen; and at least one of the following additional elements: (i) up to about 0.04 weight percent zirconium, and (ii) up to about 0.02 weight percent titanium.

Description

field of invention [0001] The present invention relates to weld metals having excellent low temperature toughness for joining high strength low alloy steels. The invention also relates to molten welding wires and welding methods for producing such weld metals. The microstructure of the weld metal produced by the welding consumable wire and welding method of the present invention can provide excellent strength, toughness and resistance to hydrogen induced cracking. The fusion welding wire and welding method of the present invention are particularly suitable for mechanized on-site girth welding of high-strength steel pipelines into pipelines by adopting a gas-shielded metal arc welding method. Background of the invention [0002] A number of terms are defined in the description that follows. For convenience, a glossary is given directly in front of the claims. [0003] For industries utilizing steel structures such as oil and gas, chemical, shipbuilding and power generation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C22C38/02C22C38/04C22C38/14C22C38/44C22C38/50B23K35/22B23K9/00B23K9/18B23K35/30C22C38/12C22C38/42C22C38/48C22C38/58
CPCB23K35/3066C21D2211/002C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/08C22C38/12C22C38/42C22C38/44C22C38/48C22C38/50C22C38/58
Inventor D·P·费尔凯尔德N-R·V·班格鲁J·库M·L·玛西雅D·L·比森A·奥赞克辛
Owner EXXONMOBIL UPSTREAM RES CO
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