Electron beam welded joint, steel sheet for electron beam welding, and manufacturing method thereof
A technology of electron beam welding and manufacturing method, which is applied in the direction of electron beam welding equipment, welding/welding/cutting items, welding media, etc., to achieve the effect of suppressing the deterioration of fracture toughness and low cost
Active Publication Date: 2016-04-27
NIPPON STEEL CORP
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Problems solved by technology
Therefore, conventionally, the thickness and size of steel plates that can be welded by high-energy-density beam welding are limited by the capabilities of welding equipment and the size of the vacuum chamber.
Method used
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Embodiment 1）
[0157] Steel materials with the composition shown in Table 1 and Table 2 were used, and steel materials were produced under the conditions shown in Table 3 and Table 4. Collect test pieces from steel, conduct tensile test and CTOD test, and measure the tensile strength and fracture toughness of steel (base material). The strength of the base material was measured based on JISZ2241 by collecting a test piece from the 1 / 2 part of the plate thickness with the rolling direction as the longitudinal direction.
[0158] Electron beam welding is performed on steel materials to produce I-groove butt weld joints. Electron beam welding adopts the RPEBW method, and is carried out under the conditions of a voltage of 175V, a current of 120mA, and a welding speed of about 125mm / min under a vacuum of about 1mbar. The weld width is 3.0-5.5mm.
[0159] In addition, (a) when the plate thickness is less than 60 mm, collect 6 test pieces each with a size of t (plate thickness) × 2t from the wel...
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Abstract
The composition of the steel material of the electron beam welded joint contains, in mass %, C: 0.02% to 0.1%, Si: 0.03% to 0.30%, Mn: 1.5% to 2.5%, Ti: 0.005 to 0.015%, and N: 0.0020 to 0.0060 %, Al: more than 0.004% and less than 0.05%, Nb: 0% to 0.020%, V: 0% to 0.030%, Cr: 0% to 0.50%, Mo: 0% to 0.50%, Cu: 0% to 0.25%, Ni: 0% to 0.50%, B: 0% to 0.0030%, Ca: 0% to 0.0050%, P: 0.015% or less, S: 0.010% or less, O: 0.0035% or less, the balance is composed of iron and The composition of unavoidable impurities, the electron beam welding hardenability index value CeEB is 0.49% to 0.60%, and the number of inclusion particles with an equivalent circle diameter of 1.0 μm or more in the center of the plate thickness is 20 particles / mm2 or less, containing 10% The number of Ti particles having an equivalent circle diameter of 0.05 μm or more and less than 0.5 μm is 1×103 particles / mm2 or more.
Description
technical field [0001] The present invention relates to a steel plate for electron beam welding in which a portion to be welded is irradiated with an electron beam and a method for producing the same, and further relates to an electron beam welded joint formed by irradiating the portion to be welded of the steel plate with an electron beam. [0002] This application claims priority based on Patent Application No. 2010-260388 filed in Japan on November 22, 2010, and the content is incorporated herein. Background technique [0003] In recent years, in order to reduce CO, which is one of the causes of global warming 2 Gas and to cope with the depletion of fossil fuels such as oil in the future, we are actively trying to use renewable natural energy. Wind power is also one of the promising renewable energy sources, and large-scale wind power plants are being built. [0004] Regions most suitable for wind power generation are regions where constant strong winds can be expected....
Claims
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IPC IPC(8): C22C38/00B23K15/00C21D8/02C22C38/58F03D13/25F03D80/00
CPCB23K15/0053C21D9/50C21D2211/004C22C38/001C22C38/02C22C38/04C22C38/06C22C38/14B23K35/3033B23K35/3066B23K35/3073C22C38/002C22C38/08C22C38/12C22C38/16B23K2103/04
Inventor 本间龙一植森龙治石川忠儿岛明彦星野学
Owner NIPPON STEEL CORP