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Wire for electroslag welding, flux for electroslag welding and welded joint

A welding joint and electroslag welding technology, applied in the fields of electroslag welding wire, electroslag welding flux and welding joints, can solve problems such as low strength, and achieve the effect of excellent strength and extremely low temperature toughness

Active Publication Date: 2019-05-21
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The weld metal obtained by these welding methods has excellent low-temperature toughness, but its strength is lower than that of the 9% Ni steel base material. There is a problem that the design plate thickness of the structure must be increased according to the strength of the Ni-based weld metal part. plate thickness

Method used

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  • Wire for electroslag welding, flux for electroslag welding and welded joint
  • Wire for electroslag welding, flux for electroslag welding and welded joint
  • Wire for electroslag welding, flux for electroslag welding and welded joint

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Embodiment Construction

[0079] In order to solve the above-mentioned problems, the inventors of the present invention conducted research on applying electroslag welding, which has not been studied so far, as a high heat input welding method using a welding material of about 6.0 to 15.0% Ni. As a result, it has been found that, if a welding consumable whose composition is properly adjusted is used, a welded joint having a weld metal excellent in strength and ultra-low temperature toughness can be obtained even when the heat input is large, for example, 10 kJ / mm or more. the invention.

[0080] Here, electroslag welding is a method in which a welding wire is put into a molten slag pool, and the Joule heat of the molten slag is mainly used as a heat source to melt the base material and the welding wire to perform welding. Electroslag welding enables vertical welding of thick structures such as shipbuilding and industrial machinery in a single pass. Up to now, the vertical welding of the above-mentioned...

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Abstract

The present invention relates to a wire for electroslag welding, which is characterized by containing, in mass% relative to the total mass of the wire, more than 0% but 0.07% or less of C, more than 0% but 0.50% or less of Si, more than 0% but 1.0% or less of Mn, from 6.0% to 15.0% of Ni and 79% or more of Fe, while satisfying formula (1). The present invention also relates to: a flux for electroslag welding, which is used in electroslag welding together with the wire for electroslag welding; and a welded joint which is produced by electroslag welding that uses the wire for electroslag weldingand the flux for electroslag welding. 0.150<=C+Si / 30+Mn / 20+Ni / 60<=0.300 (1).

Description

technical field [0001] The present invention relates to a welding wire used in electroslag welding of extremely low temperature steel 5.0 to 10.0% Ni steel suitable for storage of liquefied natural gas at a low temperature, and chemical plant equipment used therein, and a flux used for the welding, and welding using these material to obtain welded joints. Background technique [0002] 9% Ni steel has high strength and excellent extremely low temperature toughness around liquid nitrogen temperature (-196°C). Therefore, 9% Ni steel is commonly used as a base material for manufacturing storage tanks stored at low temperatures such as liquefied natural gas (LNG) by welding. These storage tanks are required to be excellent in cryogenic toughness in the temperature range of liquids such as LNG, that is, in the temperature range of -162° C. or lower. Therefore, the weld metal (welded joint) of the welded joint formed by welding 9% Ni steel is also required to have excellent cryog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/362B23K35/368C22C38/00C22C38/08
CPCB23K35/362B23K35/368C22C38/08B23K35/3066B23K35/3602B23K35/3605B23K25/00B23K35/0261B23K35/0266C22C38/002C22C38/005C22C38/02C22C38/04C22C38/12C22C38/14C22C38/16C22C38/44C22C38/54B23K9/167B23K9/173B23K9/23B23K33/006B23K2101/12B23K2103/04B23K35/30B23K35/3607B23K35/361C22C38/06C22C38/40C22C38/42C22C38/46C22C38/48B23K35/3053
Inventor 石崎圭人袁倚旻名古秀德杉村朋子冈崎喜臣
Owner KOBE STEEL LTD
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