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Bonded flux and solid wire for submerged arc welding, and method for submerged arc welding of steel for low temperature service

A technology of solid wire and submerged arc welding, which is applied in the direction of arc welding equipment, welding/welding/cutting items, welding media, etc., can solve the problems of failure to achieve low-temperature fracture toughness, and achieve the effect of excellent fracture toughness

Inactive Publication Date: 2012-08-01
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In addition, in Patent Document 2, when welding the low-temperature steel used in marine structures and LPG storage tanks, it is desired to obtain the maximum Weld metal with excellent low-temperature toughness at -70°C, but has not achieved improvement in low-temperature fracture toughness (especially CTOD performance)

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  • Bonded flux and solid wire for submerged arc welding, and method for submerged arc welding of steel for low temperature service
  • Bonded flux and solid wire for submerged arc welding, and method for submerged arc welding of steel for low temperature service
  • Bonded flux and solid wire for submerged arc welding, and method for submerged arc welding of steel for low temperature service

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Embodiment Construction

[0026] Conventionally, a large number of techniques for increasing the toughness of weld metals have been proposed, but the technique disclosed in Patent Document 1 achieves high toughness by adjusting the basicity of the flux and the alloy composition. In addition, in Patent Document 2, high toughness is achieved by adjusting the respective alloy components in the flux and the welding wire. However, in these conventional technologies, the 0.2% yield strength is about 450 MPa, and the CTOD value is low. The present invention was made in order to solve such problems of the prior art. By adjusting the alloy composition of the flux and the welding wire, the 0.2% yield strength of the strength level is 500 MPa or more, the tensile strength is 610 MPa or more, and the CTOD to -40°C is 0.25 mm or more, a weld metal with excellent fracture toughness.

[0027] Hereinafter, the reasons for limiting the composition of the flux and welding wire of the present invention will be described...

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Abstract

Disclosed is a bonded flux and a solid wire for submerged arc welding, and a method for submerged arc welding of a low-temperature steel each of which gives a weld bead (weld metal) having excellent low-temperature fracture toughness with satisfactory weldability. The bonded flux includes 23-43% of MgO, 11-31% of Al 2 O 3 , 6-16% of CaF 2 ,7-20 DEG % of SiO 2 , 1.0-8.0% as CO 2 equivalent of a metal carbonate, a total of 2-16% of CaO and / or BaO, 0.4-1.5% of metallic silicon, a total of 1.0-7.0% as titanium equivalent of metallic titanium and titanium oxide, a total of 0.01-0.20% as boron equivalent of metallic boron and / or boron oxide, and a total of 1.0-6.0% as equivalents of respective elements of at least one oxide of Na, K, and Li, and has a ratio ([Total Ti]+[Total B]) / [SiO 2 ] of from 0.05 to 0.55.

Description

technical field [0001] The present invention relates to a bonding flux and a welding wire for submerged arc welding, and particularly relates to a welding part having excellent fracture toughness at a low temperature of about -40°C, which is mainly used as a marine structure or an LPG oil storage tank, etc. Adhesive flux and solid wire for submerged arc welding suitable for welding low-temperature high-strength steel, and submerged arc welding method for low-temperature steel. Background technique [0002] Steel for low temperature is used for transmission line pipes in cold regions, marine structures such as oil drilling platforms in the ocean, and LPG storage tanks. In these structures, further improvements in quality are required from the viewpoint of safety and durability, and among them, performance improvements of welded parts are more strictly required. [0003] As the quality of the welded portion, there is fracture toughness at low temperature, and the evaluation c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362B23K35/30B23K9/18
CPCB23K9/186C22C38/14B23K35/3607B23K2203/04B23K35/3605B23K35/362C22C38/02B23K35/3053C22C38/04B23K35/3602C22C38/08C22C38/001B23K35/361B23K9/23B23K9/18B23K2103/04B23K35/36
Inventor 韩鹏太田诚中西浩二郎
Owner KOBE STEEL LTD