Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Fukujukogyo Co., Ltd.

Nippon Steel & Sumikin Stainless Steel Corporation

Fukuju Industry Corporation Ltd

Ryuichi Honma

Tadashi Ishikawa

Yasushi Hasegawa

Ryuji Uemori

Akihiko Kojima

Yutaka Takagi

Manabu Hoshino

Kazutoshi Ichikawa

Hiroshige Inoue

Shinji Tsuge

Yuusuke Oikawa

Shigeo Fukumoto

Manabu Mizumoto

Ryo Matsuhashi

Youichi Tanaka

Yuzuru Yoshida

Yutaka c/o Fukujukogyo Co Ltd Takagi

A steel for electron-beam welding according to the present invention includes at least C: 0.02% to 0.10%, Si: 0.03% to 0.30%, Mn: 1.5% to 2.5%, Ti: 0.005% to 0.015%, N: 0.0020% to 0.0060%, and O: 0.0010% to 0.0035%, further includes S: limited to 0.010% or less, P: limited to 0.015% or less, and Al: limited to 0.004% or less, with a balance including iron and inevitable impurities. An index value CeEBB obtained by substituting composition of the steel into following Formula 1 falls in the range of 0.42 to 0.65%, the number of oxide having an equivalent circle diameter of 1.0 &#x3bc;m or more is 20 pieces/mmor less at a thickness center portion in cross section along the thickness direction of the steel, and the number of oxide containing Ti of 10% or more and having an equivalent circle diameter of not less than 0.05 &#x3bc;m or more and less than 0.5 &#x3bc;m falls in the range of 1&#xd7;10to 1&#xd7;10pieces/mmat the thickness center portion.CeEBB=C+&#xbc;Mn+ 1/15Cu+ 1/15Ni+&#x2155;Cr+&#x2155;Mo+&#x2155;V&#x2003;&#x2003;(Formula 1)

Electron-beam welded joint, steel for electron-beam welding, and method of manufacturing the same

A welding joint comprises a pair of steel materials, and a welding metal that is formed with a high-energy density beam at a butt welding portion between the pair of steel materials, wherein a transformation starting temperature Ms that is calculated by a following formula: Ms(&#xb0; C.)=371&#x2212;353C&#x2212;22Si&#x2212;24.3Mn&#x2212;7.7Cu&#x2212;17.3Ni&#x2212;17.7Cr&#x2212;25.8Mo, using a composition of mass % of the welding metal is 250&#xb0; C. or less.

Butt welding joint using high-energy density beam

A butt-welded joint of a welded structure which includes a pair of target metals; a weld bead formed by irradiating a high-energy density beam to a butt portion between the pair of the target metals and has a width W on the irradiated side surface; and a pair of altered zones consisting of heat-affected zones formed by irradiating another high-energy density beam to both sides of the center of the weld bead in the weld bead width direction such that the pair of the altered zones are located on respective sides of the center of the weld bead and each has a band shape extending in the weld bead length direction and a method for manufacturing the butt-welded joint of the welded structure.

Butt-welded joint of welded structure, and method for manufacturing the same

A welding wire for austenitic stainless steel welding contains, in percent by mass, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 1.0 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: more than 0.30 through 0.50%, limiting O to 0.03% or less, P to 0.03% or less, and S to 0.005% or less, and having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between 0.85 and 1.2 and a PI value of 35 or more, the remainder being iron and unavoidable impurities.

Austenitic stainless steel welding wire and welding structure

A butt-welded joint includes a pair of steel plates, a first weld metal that is formed at a butting portion of the pair of steel plates from a side of a first surface of the butt-welded joint to a side of a second surface opposite the first surface by irradiation of a first high-energy density beam from the side of the first surface, and a second weld metal that is formed by irradiation of a second high-energy density beam to cover an end surface of the first weld metal at the side of the first surface side of the first weld metal. A width Wof the first weld metal on the first surface and a width Wof the second weld metal on the first surface satisfy an equation 1.2&#x2266;W/W&#x2266;3.5, and a depth of the second weld metal from the first surface is 2.0 mm to 10.0 mm.

Butt-welded joint and method for manufacturing same

An electron-beam welded joint including, by 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%, N: 0.0020 to 0.0060%, O: 0.0010% to 0.0035%, 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%, S: limited to 0.010% or less, P: limited to 0.015% or less, Al: limited to 0.004% or less, and a balance consisting of iron and unavoidable impurities, wherein an index value CeEB is 0.49% to 0.60%, a number of oxides having an equivalent circle diameter of 1.0 &#x3bc;m or more is 20 pieces/mmor less, and a number of oxides having an equivalent circle diameter of 0.05 &#x3bc;m or more and less than 0.5 &#x3bc;m is 1&#xd7;10pieces/mmto 1&#xd7;10pieces/mmat a thickness center portion.

Electron-beam welded joint, steel for electron-beam welding, and manufacturing method

The present invention provides a common rail formed by bonding a common rail body and a common rail holder which has a pressing surface and a convex bonding surface, by means of a heat pressure bonding process and a liquid phase diffusion bonding process, wherein the height H of the convex bonding surface satisfies 1 &#x3bc;m&#x2266;H&#x2266;50 &#x3bc;m, and the common rail holder includes a deformation introducing portion in which an area of a cross-section parallel to the pressing surface is smaller than the area of the pressing surface.

Common rail, common rail holder, and method of producing common rail

To form a welded joint having a sufficiently high fracture toughness value &#x3b4;c by butting welding high strength steel plates having a yield strength of the 355 MPa class or more and a plate thickness of over 50 mm by electron beam welding, the butt welded joint is made one where the hardness of the weld metal is 110% to 220% of the hardness of the base material and where the width of the weld metal is 20% A or less of the base material plate thickness.

Electron beam welded joint excellent in brittle fracture resistance

An automobile-use high pressure fuel injection accumulator-distributor comprised of a body of an automobile-use high pressure fuel injection accumulator-distributor to which pipe attachment holders for attaching fuel distribution pipes for distributing fuel to injection nozzles at an equal pressure are joined by liquid phase diffusion bonding etc., wherein each holder is comprised of a tube part at the pipe side and a partial cone-shaped skirt at the end of the rail body side, each holder skirt has a shape spreading in a partial cone shape toward the joint face end with an angle from the holder tube part side face of 10&#xb0; or more in a range of a length of 2 mm or more in the holder axial direction at the outer circumference of the end of the holder at the joint face side, the rail body has holder joint position determining guide grooves at its holder joint positions, each guide groove is comprised of a groove inner circumferential wall of a size enabling engagement with a holder joint inner circumference, a groove bottom forming a joint face with the holder, and a groove outer circumferential wall of a partial cone shape bulging out to the inner side parallel to the holder skirt from the groove bottom toward the holder side at a depth of 2 mm or more, and a metal ring is plastically deformed and press-fit into a clearance of 0.5 mm or more between each holder skirt and the groove outer circumferential wall and parallel to the joint face.

Automobile-use high pressure fuel injection accumulator-distributor and method of production of the same

A liquid phase diffusion bonding method for a metal machine part superior in the quality of the joint and the productivity enabling the bonding time to be shortened, achieving homogenization of the bonding structure and improving the tensile strength, fatigue strength, and joint quality and reliability. This liquid phase diffusion bonding method of a metal machine part is characterized interposing an amorphous alloy foil for liquid phase diffusion bonding at bevel faces of metal materials, performing primary bonding by melt bonding said amorphous alloy foil and said metal material by resistance welding to form a joint, then performing secondary bonding by liquid phase diffusion bonding by reheating said joint to at least the melting point of said amorphous alloy foil, then holding it there to complete the solidification process of said joint.

Growing community of inventors

Tokyo, Japan

Ryuichi Honma