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Weld metals with superior low temperature toughness jfor 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 problems such as suboptimal pipelines, achieve good hydrogen-induced cracking resistance, high strength, and avoid hydrogen-induced cracking effects

Inactive Publication Date: 2004-09-15
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 jfor joining high strength, low alloy steels
  • Weld metals with superior low temperature toughness jfor joining high strength, low alloy steels
  • Weld metals with superior low temperature toughness jfor 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 wt% nickel, about 0.0175-0.0400 wt% oxygen, and at least one of the following additional elements: up to about 0.04 wt% zirconium and up to about 0.02 wt% titanium. The weld metal according to the present invention may also contain less than about 0.01 wt % phosphorus, less than about 0.01 wt % sulfur, up to about 0.03 wt % aluminum and less than about 0.020 wt % nitrogen. Additionally, the weld metal may contain at least one of up to about 0.60 wt% chromium, up to about 0.60 wt% copper, up to about 0.040 wt% vanadium, and up to about 0.0012 wt% 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 the necessary composition of the molten welding wire. The microstructure of th...

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Abstract

Weld metals suitable for joining high strength, low alloy steels are provided. These weld metals have microstructures of acicular ferrite interspersed in a hard constituent, such as lath martensite, yield strengths of at least about 690 MPa (100 ksi), and DBTTs lower than about -50 DEG C. (-58 DEG F.) as measured by a Charpy energy versus temperature curve. These weld metals include about 0.04 wt % to about 0.08 wt % carbon; about 1.0 wt % to about 2.0 wt % manganese; about 0.2 wt % to about 0.7 wt % silicon; about 0.30 wt % to 0.80 wt % molybdenum; about 2.3 wt % to about 3.5 wt % nickel; about 0.0175 wt % to about 0.0400 wt % oxygen, and at least one additive selected from the group consisting of (i) up to about 0.04 wt % zirconium, and (ii) up to about 0.02 wt % 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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IPC IPC(8): B23K35/30C22C38/02C22C38/04C22C38/08C22C38/12C22C38/42C22C38/44C22C38/48C22C38/50C22C38/58
CPCC22C38/50C21D2211/008C22C38/02C22C38/42C22C38/48C22C38/12C22C38/04B23K35/3066C21D2211/005C22C38/58C22C38/08C22C38/44C21D2211/002
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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