Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Kyorin Pharmaceutical Co., Ltd.

Tokyo Keiki Inc.

Akihiko Kojima

Ryuji Uemori

Tadashi Ishikawa

Yoshiyuki Watanabe

Ryuichi Honma

Rikio Chijiiwa

Kazuhiro Fukunaga

Manabu Hoshino

Masanori Minagawa

Yasushi Kohno

Yi Hu

Yuzuru Yoshida

Youichi Tanaka

Allister Fraser

Takehiro Inoue

Hiroshi Shimanuki

Tadashi Koseki

Takayuki Tamaki

Junichi Ishiyama

Yoshihide Nagai

Kevin Shreder

Toyoori Yoshida

Jun Otani

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 fiber optic gyroscope sensing coil, with which winding process of optical fiber may be simplified, crosstalk due to winding deficiencies may be reduced, and temperature sensitivity of gyroscope may be reduced. A coil bodyincludes two potted coilshaving respective windings of optical fiber which are wound in an aligned winding configuration while the same tension is applied to optical fiber and at the same feed speed of optical fiber between the two potted coils and encapsulated within a potting material. The potted coilsare united together to form the coil bodyby adhering the potted coils with each other at respective one side facesthereof by using the potting materialas adhesive, and the tip ends of respective first fiber end sectionsof optical fiberof the potted coils, which are guided out from respective outermost layers of the windings of the potted coils, are connected with each other by fusing to form a continuous length of optical fiber of the coil bodywound in one direction.

Fiber optic gyroscope sensing coil and method of fabricating the same

A steel for a welded structure includes the following composition: by mass %, C at a C content [C] of 0.010 to 0.065%; Si at a Si content [Si] of 0.05 to 0.20%; Mn at a Mn content [Mn] of 1.52 to 2.70%; Ni at a Ni content [Ni] of 0.10% to 1.50%; Ti at a Ti content [Ti] of 0.005 to 0.015%; O at an O content [O] of 0.0010 to 0.0045%; N at a N content [N] of 0.002 to 0.006%; Mg at a Mg content [Mg] of 0.0003 to 0.003%; Ca at a Ca content [Ca] of 0.0003 to 0.003%; and the balance composed of Fe and unavoidable impurities. A steel component parameter Pis 0.065% or less, and a steel component hardness parameter CeqH is 0.235% or less.

Steel for welded structure and producing method thereof

A steel for a welded structure includes the following composition: by mass %, C at a C content [C] of 0.015 to 0.045%; Si at a Si content [Si] of 0.05 to 0.20%; Mn at a Mn content [Mn] of 1.5 to 2.0%; Ni at a Ni content [Ni] of 0.10 to 1.50%; Ti at a Ti content [Ti] of 0.005 to 0.015%; O at an O content [O] of 0.0015 to 0.0035%; and N at a N content [N] of 0.002 to 0.006%, and a balance composed of Fe and unavoidable impurities. In the steel for a welded structure, the P content [P] is limited to 0.008% or less, the S content [S] is limited to 0.005% or less, the Al content [Al] is limited to 0.004% or less, the Nb content [Nb] is limited to 0.005% or less, the Cu content [Cu] is limited to 0.24% or less, the V content [V] is limited to 0.020% or less, and a steel composition parameter Pis 0.065% or less, and a steel composition hardness parameter CeqH is 0.235% or less.

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 high strength steel having unprecedentedly superior CTOD (fracture toughness) properties satisfying not only the CTOD properties of the FL zone at &#x2212;60&#xb0; C., but also the CTOD properties of the ICHAZ zone in small and medium heat input multilayer welding, etc.; and a method of production of the same. The steel of the present invention is steel superior in CTOD properties of the heat-affected zone containing, by mass %, C: 0.015 to 0.045%, Si: 0.05 to 0.2%, Mn: 1.5 to 2.0%, Cu: 0.25 to 0.5%, Ni: 0.7 to 1.5%, P: 0.008% or less, S: 0.005% or less, Al: 0.004% or less, Ti: 0.005 to 0.015%, Nb: 0.005% or less, O: 0.0015 to 0.0035%, and N: 0.002 to 0.006%, P: 0.065 or less, CeqH: 0.235 or less and the balance consisting of Fe and unavoidable impurities.

Steel superior in CTOD properties of weld heat-affected zone and method of production of same

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

Provided herein are benzoxazinone compounds of formula I and compositions containing the compounds. The compounds and compositions are useful in the methods of inhibiting the action of serine hydrolase, including neutrophil elastase. In certain embodiments, the compounds and compositions are useful in the prevention, amelioration or treatment of serine hydrolase-mediated diseases.

Serine hydrolase inhibitors

A large-heat-input butt-welded joint of welded structures prepared by butt-welding high-strength steel plates over 50 mm in thickness, having excellent brittle fracture resistance, is characterized by: (a1) the hardness of the weld metal is not more than 110% of the hardness of the base metal or (a2) the hardness of the weld metal is not less than 70% and not more than 110% of the hardness of the base metal, and, as required, (b) the width of the weld metal is not more than 70% of the plate thickness of the base metal, (c) the width of the region affected by welding whose hardness is softened to not more than 95% of the hardness of the non-heat-affected base metal has a width not less than 5 mm, and/or (d) the prior austenite grain size in the heat-affected zone (HAZ) contacting the welding fusion line is not more than 200 &#x3bc;m.

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Tokyo, Japan

Akihiko Kojima