Patents by Inventor Tsuneshi Ogawa
Tsuneshi Ogawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6340396Abstract: A flux cored wire for welding duplex stainless steel, comprising a shell cored with a flux. The wire is good in pitting corrosion resistance and notch toughness. In the wire, the total of the shell and the flux comprises Cr, Mo and N in an amount of 21.0-26.0 wt %, 2.6-4.0 wt % and 0.08-0.30 wt %, respectively, of the total weight of the wire; the amounts of C, Bi and a metal inclusion having a melting point over 2000° C. are set up to 0.04 wt % or less, 0.015 wt %, and 0.1 wt %, respectively; the total amount of Ni powder and Fe powder is set up to 3.0 wt %; and a parameter A represented by [Cr]+3.3×[Mo]+16×[N]−150×[Bi] wherein [Cr], [Mo], [N] and [Bi] represent the contents of Cr, Mo, N and Bi, respectively, is from 33.0 to 43.0.Type: GrantFiled: September 8, 1999Date of Patent: January 22, 2002Assignee: Kabushiki Kaisha Kobe Seiko ShoInventors: Tsuneshi Ogawa, Toshiharu Maruyama, Haruya Kozuki, Shintaro Ozaki
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Patent number: 5914061Abstract: A high nitrogen flux cored wire contains N and nitrogen compound (total converted value of N): 0.05 to 0.30 wt %, with respect to total weight of the wire, in stainless steel sheath and flux, and TiO.sub.2 : 4.0 to 8.0 wt %; ZrO.sub.2 : 0.5 to 4.0 wt %; SiO.sub.2 : 0.05 to 1.5 wt %; Al.sub.2 O.sub.3 : 0.05 to 1.5 wt %; metal fluoride (converted value of F): 0.02 to 0.7 wt %; and metal carbonate: less than or equal to 1.0 wt %; a content of Al.sub.2 O.sub.3 and SiO.sub.2 in total being restricted to be less than or equal to 2.5 wt %, with respect to total weight of the wire, in the flux. Since an appropriate amount of nitrogen is contained in the wire, superior corrosion resistance of the welded metal can be obtained. Also, since an appropriate amounts of the slag forming agent, alloying component and so forth are contained, it becomes possible to achieve high welding workability in all position welding.Type: GrantFiled: November 4, 1996Date of Patent: June 22, 1999Assignee: Kabushiki Kaisha Kobe Seiko ShoInventors: Tsuneshi Ogawa, Toshiharu Maruyama, Shigeki Nishiyama, Shintaro Ozaki
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Patent number: 5861605Abstract: A high nitrogen flux cored wire for welding of Cr--Ni type stainless steel is formed by filling a flux into a sheath of stainless steel. The flux is composed of N and nitrogen compound (total converted value of N): 0.05 to 0.30 wt % with respect to total weight of wire, in the sheath and the flux; and TiO.sub.2 : 4.0 to 8.0 wt %, SiO.sub.2 : 0.3 to 3.0 wt %, Al.sub.2 O.sub.3 : 0.05 to 1.5 wt %, metal fluoride (converted value of F): 0.05 to 0.7 wt %, ZrO.sub.2 : less 0.5 wt %, and metal carbonate: less than or equal to 1.0 wt % with respect to total weight of the wire, in said flux.Type: GrantFiled: October 25, 1996Date of Patent: January 19, 1999Assignee: Kabushiki Kaisha Kobe Seiko ShoInventors: Tsuneshi Ogawa, Toshiharu Maruyama, Shigeki Nishiyama, Shintaro Ozaki
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Patent number: 5854462Abstract: Provided is a stainless-steel flux cored wire electrode with excellent arc stability and good workability with less sputter generation, which can attain the overall sputter reduction and arc stability and can further prevent instantaneous arc disorders and sputter generation at a higher level to form a high-quality weld metal. A stainless-steel flux cored wire electrode comprising a flux filled in the stainless-steel housing at 10 to 30% to the total weight of the wire electrode, wherein the wire electrode temperature is measured and recorded on the recording chart of a temperature recorder, which chart is scaled in such a manner that the 100.degree. C. corresponds to 5 cm and the 100 mm wire electrode length corresponds to 1 cm, by passing electricity through appropriate two points, apart 300 mm to 1,000 mm from each other, in the wire electrode in the longitudinal direction, to electrically heat the wire electrode to 500.degree. to 1,000.degree. C.Type: GrantFiled: March 28, 1997Date of Patent: December 29, 1998Assignee: Kabushiki Kaisha Kobe Seiko ShoInventors: Tsuneshi Ogawa, Teru Haginoya, Toshiharu Maruyama, Shigeki Nishiyama, Shintaro Ozaki
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Patent number: 5378871Abstract: Described herein is a flux cored wire for use in stainless steel welding, the wire having a flux filled In a stainless steel sheath, the flux containing, on the basis of the total weight of the wire, 4.7-8.5% of TiO.sub.2, 0.5-3.5% of Al.sub.2 O.sub.3 and 0.6-3.0% of SiO.sub.2 and/or ZrO.sub.2 in proportions satisfying the following formulaTiO.sub.2 >Al.sub.2 O.sub.3 +SiO.sub.2 +ZrO.sub.2and further 0.02-0.25% of metal fluoride (in terms of F conversion value) and 0.1-1.0% of Ti. Desirably, the flux contains slag-forming components in a restricted range of 8.5-13.5% and In proportions satisfying the following formulaAl.sub.2 O.sub.3 +SiO.sub.2 +ZrO.sub.2 .ltoreq.5.0%.Type: GrantFiled: February 23, 1993Date of Patent: January 3, 1995Assignee: Kabushiki Kaisha Kobe Seiko ShoInventors: Yutaka Nishikawa, Tsuneshi Ogawa, Tsuyoshi Kurokawa, Toshiharu Maruyama
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Patent number: 5219425Abstract: Described herein is a flux containing wire for use in stainless steel welding, the wire having a flux filled in a stainless steel sheath, the flux containing, on the basis of the total weight of the wire, 4.7-8.5% of TiO.sub.2, 0.5-3.5% of Al.sub.2 O.sub.3 and 0.6-3.0% of SiO.sub.2 and/or ZrO.sub.2 in proportions satisfying the following formulaTiO.sub.2 >Al.sub.2 O.sub.3 +SiO.sub.2 +ZrO.sub.2and further 0.02-0.25% of metal fluoride (in terms of F conversion value) and 0.1-1.0% of Ti. Desirably, the flux contains slag-forming components in a restricted range of 8.5-13.5% and in proportions satisfying the following formulaAl.sub.2 O.sub.3 +SiO.sub.2 +ZrO.sub.2 .ltoreq.5.0%.Type: GrantFiled: September 22, 1992Date of Patent: June 15, 1993Assignee: Kabushiki Kaisha Kobe Seiko ShoInventors: Yutaka Nishikawa, Tsuneshi Ogawa, Tsuyoshi Kurokawa, Toshiharu Maruyama
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Patent number: 5124529Abstract: A flux-cored wire for welding stainless steel, with the flux filled in the metal skin, which contains 5-30% (by weight) of flux, 10.5-27.0% of Cr, less than 2% of slag-forming constituents, 0.05-2.0% of Ti, 0.05-2.0% of Si, 0.01-0.1% of N, 0.01-1.0% of Al, 0.1-1.0% of Mn, and 0.003-0.5% of metal fluorides constituting the flux, in the total weight of the wire. The wire may optionally contain Ni, alkali metals, S, Nb, Zr, and V. The wire gives rise to only a small amount of slag.Type: GrantFiled: February 22, 1991Date of Patent: June 23, 1992Assignee: Kabushiki Kaisha Kobe Seiko ShoInventors: Yutaka Nishikawa, Tsuneshi Ogawa, Ken Yamashita, Haruya Kozuki
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Patent number: 4345140Abstract: A composite wire containing a flux for use in gas-shielded arc welding of stainless steels which contains, in the flux, the following inorganic components with respect to the total weight of the wire: 0.1 to 10% by weight of an anhydrous silicate, and 0.01 to 0.75% of a metallic oxide having a melting point of no more than 888.degree. C.Type: GrantFiled: June 19, 1980Date of Patent: August 17, 1982Assignee: Kobe Steel, Ltd.Inventors: Tomokazu Godai, Shoji Minato, Katushi Nishimura, Tsuneshi Ogawa
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Patent number: 4192175Abstract: The invention is a process and apparatus for measurement of diffusible hydrogen within a metal, in which a metal sample is placed within an enclosed collector vessel for a predetermined time and at a predetermined temperature, and the total resultant effused gases within the collector vessel are fed to a gas chromatograph.Type: GrantFiled: March 3, 1978Date of Patent: March 11, 1980Assignee: Kobe Steel, Ltd.Inventors: Tomokazu Godai, Tohru Sugiyama, Morihiko Sugino, Masaru Kondo, Tsuneshi Ogawa