Electroslag welding wire, electroslag welding flux and welding joints
A technology for electroslag welding and welding wire, which is applied in the fields of welding wire for electroslag welding, flux for electroslag welding and welding joints, which can solve the problems of low strength and achieve excellent strength and extremely low temperature toughness.
Active Publication Date: 2022-06-07
KOBE STEEL LTD
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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
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[0077] In order to solve the above-mentioned problems, the present inventors have studied by applying electroslag welding, which has not been studied in the past, as a large heat flux welding method using a welding material of about 6.0 to 15.0% Ni. As a result, it was found that, by using a welding material whose components are appropriately adjusted, even in the case of welding with a large line energy of, for example, 10 kJ / mm or more, a welded joint having a weld metal excellent in strength and extremely low temperature toughness can be obtained. the present invention.
[0078] Here, electroslag welding is a method in which a welding wire is put into a molten slag pool, and the base metal and the welding wire are melted and welded by mainly using Joule heat of the molten slag as a heat source. Electroslag welding enables vertical welding of structures with large plate thicknesses such as shipbuilding and industrial machinery in a single pass. The vertical welding of the a...
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Abstract
The welding wire for electroslag welding of the present invention is characterized in that, in the total mass of the welding wire, in mass %, C: higher than 0% and lower than 0.07%, Si: higher than 0% and lower than 0.50%, Mn: More than 0% and less than 1.0%, Ni: 6.0 to 15.0%, Fe: 79% or more, and satisfy the following formula (1), and also relate to the electrode used for electroslag welding together with the welding wire for electroslag welding A flux for electroslag welding, and a weld joint produced by electroslag welding using the welding wire for electroslag welding and 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 5.0 to 10.0% Ni steel for extremely low temperature steels suitable for storage of liquefied natural gas at low temperature and chemical plant equipment used, and a flux used for the welding, and welding using these Material obtained for welded joints. Background technique [0002] 9%Ni steel has high strength and excellent extremely low temperature toughness around liquid nitrogen temperature (-196℃). Therefore, 9% Ni steel is commonly used as a base material for manufacturing storage tanks such as liquefied natural gas (LNG) stored at low temperature by welding. These storage tanks are required to be excellent in extremely low temperature toughness in the temperature range of liquids such as LNG, that is, in the temperature range of −162° C. or lower. Therefore, also in the weld metal (weld joint) of the welded joint formed by welding 9% Ni steel, it is also required to ...
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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