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Electron beam welded joint, steel material for use in electron beam welded joint, and manufacturing method thereof

A technology of electron beam welding and manufacturing method, applied in the field of electron beam welding joints

Active Publication Date: 2013-04-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

No welding wire is used in the usual electron beam welding method

Method used

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  • Electron beam welded joint, steel material for use in electron beam welded joint, and manufacturing method thereof
  • Electron beam welded joint, steel material for use in electron beam welded joint, and manufacturing method thereof
  • Electron beam welded joint, steel material for use in electron beam welded joint, and manufacturing method thereof

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Embodiment ）

[0181] Steel materials having 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 steel material (base material) was measured based on JIS Z2241 by collecting a test piece from the 1 / 2 part of the plate thickness with the rolling direction as the longitudinal direction. In addition, steel materials with a yield stress of 355 to 420 MPa were evaluated as good.

[0182] Electron beam welding is performed on steel materials to produce I-groove butt weld joints. For electron beam welding, the RPEBW method is adopted, using pure Ni foil as the fillet, 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. Samples are co...

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Abstract

The disclosed steel material for use in electron beam welded joint contains, in mass%, at least 0.02%-0.10% C, 0.03%-0.30% Si, 1.5%-2.5% Mn, 0.005%-0.015% Ti, 0.0020%-0.0060% N, 0.0010%-0.0035% O, 0.0003%-0.0027% Mg and 0.0003%-0.0027% Ca, limits Al to 0.015% or less, P to 0.015% or less and S to 0.010% or less, with the remainder consisting of iron and unavoidable impurities, and further fulfills 0.0006% <= Mg+Ca <= 0.0040% and has an index value CeEBB of 0.42%-0.65%. In the center of the plate thickness in the cross-sectional view taken along the direction of the plate thickness of said steel material, the number of oxides having an equivalent circle diameter of 1.0[mu]m or greater is 20 / mm2 or fewer, and in the aforementioned center of plate thickness, the number of oxides containing 7% Mg or more and having a circle equivalent diameter of 0.05[mu]m or greater and less than 0.5[mu]m is 1x103 / mm2 to 1x105 / mm2.

Description

technical field [0001] The present invention relates to a steel material for electron beam welding which is welded by irradiating an electron beam to a welded part with a plate-like or foil-like fillet sandwiched between the groove surface and a manufacturing method thereof, and also relates to a steel material for welding by irradiating an electron beam on the groove surface of the steel material. An electron beam welded joint formed by irradiating electron beams to the welded part holding the fillet between the surfaces. [0002] This application claims priority based on Japanese Patent Application No. 2010-260582 for which it applied in Japan on November 22, 2010, and uses the content here. Background technique [0003] In recent years, in response to one of the causes of global warming, CO 2 With the reduction of gas and the depletion of fossil fuels such as oil in the future, we are actively trying to use renewable natural energy. Wind power generation is also expecte...

Claims

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Application Information

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IPC IPC(8): C22C38/00B23K15/00B23K35/30C21D8/02C22C19/03C22C38/14C22C38/58F03D13/25F03D80/00
CPCC22C38/14B23K2203/04C22C38/002C22C38/06C22C38/02C22C38/12C22C38/04C22C38/08C22C38/16B23K15/0053C22C38/001B23K35/3026B23K35/3033B23K35/3073B23K2103/04
Inventor 植森龙治本间竜一石川忠儿岛明彦星野学
Owner NIPPON STEEL CORP