Patents by Inventor Yoshihiro Yazawa
Yoshihiro Yazawa 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: 10774396Abstract: Disclosed is a manufacturing method for a seawater-resistant stainless clad steel including a cladding material made of stainless steel having a pitting index represented by Cr[mas %]+3.3Mo[mass %]+16N[mass %], of 35.0 or more and a microstructure in a surface portion thereof including, by area ratio, less than 2.0% of a ? phase. The method including the steps of performing a mechanical treatment from at least one of grindstone polishing and belt polishing and performing at least one of an electrolytic treatment in acid solutions or in neutral salt solutions, and a pickling treatment, to manufacture the stainless clad steel having dynamic friction coefficients in the rolling direction and in a direction at a right angle to the rolling direction, determined in accordance with JIS K 7125, both of 0.05 or less.Type: GrantFiled: June 20, 2018Date of Patent: September 15, 2020Assignee: JFE Steel CorporationInventors: Yoshihiro Yazawa, Keiichiro Kishi, Shunichi Tachibana, Toshiyuki Hoshino
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Patent number: 10207477Abstract: A cladding material for stainless steel clad steel plate, includes, by mass %, 0.03% or less carbon, 1.5% or less silicon, 2.0% or less manganese, 0.04% or less phosphorus, 0.03% or less sulfur, 22.0% to 25.0% nickel, 21.0% to 25.0% chromium, 2.0% to 5.0% molybdenum, 0.15% to 0.25% nitrogen, and the balance being iron and incidental impurities, wherein critical pitting temperature (CPT) after normalization as determined in accordance with ASTM G48-03 Method E is 45° C. or higher, and corrosion loss at a welded zone as determined by a corrosion test in accordance with NORSOK Standard M-601 is 1.0 g/m2 or less.Type: GrantFiled: April 19, 2013Date of Patent: February 19, 2019Assignee: JFE STEEL CORPORATIONInventors: Keiichiro Kishi, Yoshihiro Yazawa, Shunichi Tachibana, Yota Kuronuma, Toshiyuki Hoshino
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Publication number: 20180298477Abstract: Disclosed is a manufacturing method for a seawater-resistant stainless clad steel including a cladding material made of stainless steel having a pitting index represented by Cr[mas %]+3.3Mo[mass %]+16N[mass %], of 35.0 or more and a microstructure in a surface portion thereof including, by area ratio, less than 2.0% of a ? phase. The method including the steps of performing a mechanical treatment from at least one of grindstone polishing and belt polishing and performing at least one of an electrolytic treatment in acid solutions or in neutral salt solutions, and a pickling treatment, to manufacture the stainless clad steel having dynamic friction coefficients in the rolling direction and in a direction at a right angle to the rolling direction, determined in accordance with JIS K 7125, both of 0.05 or less.Type: ApplicationFiled: June 20, 2018Publication date: October 18, 2018Applicant: JFE Steel CorporationInventors: Yoshihiro Yazawa, Keiichiro Kishi, Shunichi Tachibana, Toshiyuki Hoshino
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Patent number: 9833827Abstract: A stamping device includes a stamping data generator configured to create stamping data to form a stamp image on a surface of a processing target, a positioning data generator configured to create positioning data to position the processing target, and a controller configured or programmed to control an operation of the processing tool. The controller includes a first controller configured or programmed to control the processing tool such that stamping is performed, based on the positioning data at a first stamping energy, on the processing target including a protective sheet attached thereto in a predetermined area including a stamping area where the stamp image is to be formed, and a second controller configured or programmed to control the processing tool such that stamping is performed, based on the stamping data at a second stamping energy equal to or different from the first stamping energy, on the processing tool in a state of having the protective sheet peeled off therefrom.Type: GrantFiled: March 30, 2015Date of Patent: December 5, 2017Assignee: ROLAND DG CORPORATIONInventors: Kouichi Kobayashi, Tsutomu Kuno, Yoshihiro Yazawa
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Publication number: 20150292069Abstract: A stainless cladding steel plate with excellent sea water corrosion resistance includes a cladding metal including, in mass %, C: not more than 0.030%, Si: 0.02 to 1.50%, Mn: 0.02 to 2.0%, P: not more than 0.040%, S: not more than 0.030%, Ni: 22.0 to 25.0%, Cr: 22.0 to 26.0%, Mo: 3.5 to 5.0% and N: 0.10 to 0.25%, the balance being Fe and inevitable impurities, the cladding metal satisfying relation (1) and being such that amounts of chromium and molybdenum present as precipitates are not more than 0.3 mass % and not more than 0.2 mass %, respectively, Cr+3.3Mo+16N?40 ??(1) wherein chemical symbols indicate amounts in mass % of the respective elements.Type: ApplicationFiled: December 4, 2013Publication date: October 15, 2015Applicant: JFE Steel CorporationInventors: Keiichiro Kishi, Yoshihiro Yazawa, Shunichi Tachibana, Yota Kuronuma, Hitoshi Sueyoshi
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Publication number: 20150286207Abstract: A stamping device includes a stamping data generator configured to create stamping data to form a stamp image on a surface of a processing target, a positioning data generator configured to create positioning data to position the processing target, and a controller configured or programmed to control an operation of the processing tool. The controller includes a first controller configured or programmed to control the processing tool such that stamping is performed, based on the positioning data at a first stamping energy, on the processing target including a protective sheet attached thereto in a predetermined area including a stamping area where the stamp image is to be formed, and a second controller configured or programmed to control the processing tool such that stamping is performed, based on the stamping data at a second stamping energy equal to or different from the first stamping energy, on the processing tool in a state of having the protective sheet peeled off therefrom.Type: ApplicationFiled: March 30, 2015Publication date: October 8, 2015Inventors: Kouichi KOBAYASHI, Tsutomu KUNO, Yoshihiro YAZAWA
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Publication number: 20150159246Abstract: A base metal for a high-toughness clad plate has a shear area of 85% or more in a ?20° C. DWTT test and includes, in terms of % by mass, C: 0.030% to 0.10%, Si: 0.10% to 0.30%, Mn: 1.30% to 1.80%, P: 0.015% or less, S: 0.003% or less, Mo: 0.05% to 0.50%, V: less than 0.010%, Nb: 0.010% to 0.060%, Ti: 0.005% to 0.020%, Al: 0.040% or less, Ca: 0.0010% to 0.0040%, N: 0.0030% to 0.0060%, and the balance being Fe and unavoidable impurities.Type: ApplicationFiled: May 22, 2013Publication date: June 11, 2015Inventors: Keiichiro Kishi, Yoshihiro Yazawa, Shunichi Tachibana, Yota Kuronuma, Toshiyuki Hoshino, Kimihiro Nishimura
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Publication number: 20150132177Abstract: A stainless clad steel includes a stainless steel having Pitting Index of 35 or more as a cladding material, wherein the ratio of Cr concentration/Fe concentration in a passivation film portion of the above-described cladding material to Cr concentration/Fe concentration in a parent phase portion of the above-described cladding material is 1.20 or more and, in addition, the amount of precipitation of a ? (sigma) phase of the surface of the above-described cladding material is 2.0% or less on an area ratio basis.Type: ApplicationFiled: March 5, 2013Publication date: May 14, 2015Inventors: Yoshihiro Yazawa, Shunichi Tachibana, Keiichiro Kishi, Yota Kuronuma, Toshiyuki Hoshino
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Publication number: 20150104667Abstract: A cladding material for stainless steel clad steel plate, includes, by mass %, 0.03% or less carbon, 1.5% or less silicon, 2.0% or less manganese, 0.04% or less phosphorus, 0.03% or less sulfur, 22.0% to 25.0% nickel, 21.0% to 25.0% chromium, 2.0% to 5.0% molybdenum, 0.15% to 0.25% nitrogen, and the balance being iron and incidental impurities, wherein critical pitting temperature (CPT) after normalization as determined in accordance with ASTM G48-03 Method E is 45° C. or higher, and corrosion loss at a welded zone as determined by a corrosion test in accordance with NORSOK Standard M-601 is 1.0 g/m2 or less.Type: ApplicationFiled: April 19, 2013Publication date: April 16, 2015Inventors: Keiichiro Kishi, Yoshihiro Yazawa, Shunichi Tachibana, Yota Kuronuma, Toshiyuki Hoshino
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Publication number: 20150030883Abstract: A seawater-resistant stainless clad steel includes a cladding material made of stainless steel having a pitting index represented by Cr[mass %]+3.3Mo[mass %]+16N[mass %], of 35.0 or more and a microstructure in a surface portion thereof including, by area ratio, less than 2.0% of a ? phase, wherein dynamic friction coefficients in the rolling direction and in a direction at a right angle to the rolling direction determined in accordance with JIS K 7125 are both 0.05 or less.Type: ApplicationFiled: March 7, 2013Publication date: January 29, 2015Applicant: JFE Steel CorporationInventors: Yoshihiro Yazawa, Keiichiro Kishi, Shunichi Tachibana, Toshiyuki Hoshino
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Publication number: 20150017476Abstract: A base metal for high-toughness clad plate having excellent toughness at a welded joint contains, in terms of mass %, C: 0.030 to 0.10%, Si: 0.10 to 0.30%, Mn: 1.00 to 1.60%, P: 0.015% or less, S: 0.003% or less, V: less than 0.010%, and at least one selected from Mo: 0.05 to 0.50%, Nb: 0.010 to 0.060%, Ti: 0.005 to 0.020%, Al: 0.040% or less, Ca: 0.0010 to 0.0040%, and N: 0.0030 to 0.0060%, the balance being Fe and unavoidable impurities, in which a percent ductile fracture is 85% or more in a ?20° C. DWTT test and vE?20° C. is 100 J or more at a HAZ 3 mm position.Type: ApplicationFiled: January 28, 2013Publication date: January 15, 2015Inventors: Shunichi Tachibana, Yoshihiro Yazawa, Keiichiro Kishi, Yota Kuronuma, Toshiyuki Hoshino, Kimihiro Nishimura, Hitoshi Sueyoshi
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Patent number: 8562758Abstract: A low Ni and high N austenitic-ferritic stainless steel is disclosed. It includes an austenitic-ferritic stainless steel having high formability and punch stretchability, crevice corrosion resistance, corrosion resistance at welded part, or excellent intergranular corrosion resistance, from a stainless steel structured by mainly austenite phase and ferrite phase, and consisting essentially of 0.2% or less C, 4% or less Si, 12% or less Mn, 0.1% or less P, 0.03% or less S, 15 to 35% Cr, 3% or less Ni, and 0.05 to 0.6% N, by mass, by adjusting the percentage of the austenite phase in a range from 10 to 85%, by volume. Furthermore, it includes an austenitic-ferritic stainless steel having higher formability by adjusting the amount of (C+N) in the austenite phase to a range from 0.16 to 2% by mass.Type: GrantFiled: January 27, 2005Date of Patent: October 22, 2013Assignee: JFE Steel CorporationInventors: Mitsuyuki Fujisawa, Yoshihiro Yazawa, Yasushi Kato, Osamu Furukimi
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Patent number: 7494551Abstract: A Ti-containing ferritic stainless steel sheet and a manufacturing method thereof include stainless steels being formed while a refining load is decreased and having a low yield strength which exhibits superior workability. The Ti-containing ferritic stainless steel sheet contains on mass percent basis: 0.01% or less of C; 0.5% or less of Si; 0.3% or less of Mn; 0.01% to 0.04% of P; 0.01% or less of S; 8% to 30% of Cr; 1.0% or less of Al; 0.05% to 0.5% of Ti; 0.04% or less of N, 8?Ti/(C+N)?30 being satisfied; and the balance being substantially Fe and incidental impurities, wherein a grain size number of ferrite grain is 6.0 or more, and an average diameter Dp of precipitation diameters, each being [(a long axis length of a Ti base precipitate+a short axis length thereof)/2], of the Ti base precipitates in the steel sheet is in the range of from 0.05 ?m to 1.0 ?m.Type: GrantFiled: June 16, 2003Date of Patent: February 24, 2009Assignee: JFE Steel CorporationInventors: Yoshihiro Yazawa, Osamu Furukimi, Yasushi Kato
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Patent number: 7341795Abstract: The invention provides a Fe—Cr alloy structure containing Cr of about 6% or more by mass but about 25% or less by mass, having a corrosion-resistant paint film containing metal powder having ionization tendencies greater than iron, with a content of the metal powder of about 20% or more by volume but about 60% or less by volume in a dry paint film, with a dry film thickness of about 5 ?m or more but about 100 ?m or less; and a manufacturing method thereof; whereby excellent corrosion resistance and excellent adhesion is provided.Type: GrantFiled: June 23, 2003Date of Patent: March 11, 2008Assignee: JFE Steel CorporationInventors: Yoshihiro Yazawa, Osamu Furukimi, Yasushi Kato, Sadao Hasuno
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Patent number: 7341690Abstract: The soft Cr-containing steel includes, on a % by mass basis, C: from about 0.001% to about 0.020%, Si: more than about 0.10% and less than about 0.50%, Mn: less than about 2.00%, P: less than about 0.060%, S: less than about 0.008%, Cr: from about 12.0% to about 16.0%, Ni: from about 0.05% to about 1.00%, N: less than about 0.020%, Nb: from about 10×(C+N) to about 1.00%, Mo: more than about 0.80% and less than about 3.00%, wherein the contents of alloying elements, represented by Si and Mo, respectively, on a % by mass, satisfy the formula Si?1.2?0.4Mo, so as to prevent precipitation of the Laves phase and to stably secure an effect of increasing high-temperature strength due to solid solution Mo.Type: GrantFiled: December 9, 2003Date of Patent: March 11, 2008Assignee: JFE Steel CorporationInventors: Atsushi Miyazaki, Junichiro Hirasawa, Mineo Muraki, Yoshihiro Yazawa, Osamu Furukimi
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Publication number: 20070163679Abstract: A low Ni and high N austenitic-ferritic stainless steel is disclosed. It includes an austenitic-ferritic stainless steel having high formability and punch stretchability, crevice corrosion resistance, corrosion resistance at welded part, or excellent intergranular corrosion resistance, from a stainless steel structured by mainly austenite phase and ferrite phase, and consisting essentially of 0.2% or less C, 4% or less Si, 12% or less Mn, 0.1% or less P, 0.03% or less S, 15 to 35% Cr, 3% or less Ni, and 0.05 to 0.6% N, by mass, by adjusting the percentage of the austenite phase in a range from 10 to 85%, by volume. Furthermore, it includes an austenitic-ferritic stainless steel having higher formability by adjusting the amount of (C+N) in the austenite phase to a range from 0.16 to 2% by mass.Type: ApplicationFiled: January 27, 2005Publication date: July 19, 2007Applicant: JFE STEEL CORPORATIONInventors: Mitsuyuki Fujisawa, Yoshihiro Yazawa, Yasushi Kato, Osamu Furukimi
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Patent number: 7056398Abstract: A ferritic stainless steel sheet contains abut 0.01 percent by mass or less of carbon; about 1.0 percent by mass or less of silicon; about 1.5 percent by mass or less of manganese; about 11 to about 23 percent by mass of chromium; about 0.06 percent by mass or less of phosphorous; about 0.03 percent by mass or less of sulfur; about 1.0 percent by mass or less of aluminum; about 0.04 percent by mass or less of nitrogen; about 0.0005 to about 0.01 percent by mass of boron; about 0.3 percent by mass or less of vanadium; about 0.8 percent by mass or less of niobium and/or about 1.0 percent by mass or less of titanium wherein 18?Nb/(C+N)+2(Ti/(C+N))?60; and the balance being iron and unavoidable impurities. The average crystal grain diameter is about 40 ?m or less and the average surface roughness is about 0.3 ?m or less.Type: GrantFiled: September 24, 2003Date of Patent: June 6, 2006Assignee: JFE Steel CorporationInventors: Yoshihiro Yazawa, Osamu Furukimi, Yasushi Kato, Yoshihiro Ozaki
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Patent number: 7025838Abstract: A ferritic stainless steel sheet for use in automobile fuel tanks and fuel pipes having smooth surface and resistance to organic acid is provided. The sheet contains, by mass, not more than about 0.1% C, not more than about 1.0 Si, not more than about 1.5% Mn, not more than about 0.06% P, not more than about 0.03% S, about 11% to about 23% Cr, not more than about 2.0% Ni, about 0.5% to about 3.0% Mo, not more than about 1.0% Al, not more than about 0.04% N, at least one of not more than about 0.8% Nb and not more than about 1.0% Ti, and the balance being Fe and unavoidable impurities, satisfying the relationship: 18?Nb/(C+N)+2Ti/(C+N)?60, wherein C, N, Nb, and Ti in the relationship represent the C, N, Nb, and Ti contents by mass percent, respectively. A process for making the same is also provided.Type: GrantFiled: February 17, 2004Date of Patent: April 11, 2006Assignee: JFE Steel CorporationInventors: Yoshihiro Yazawa, Osamu Furukimi, Mineo Muraki, Yoshihiro Ozaki, Kunio Fukuda, Yukihiro Baba
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Publication number: 20050173033Abstract: The present invention provides a Ti-containing ferritic stainless steel sheet and a manufacturing method thereof, the stainless steel being formed while a refining load is decreased and having a low yield strength which exhibits superior workability. Specifically, the Ti-containing ferritic stainless steel sheet contains on mass percent basis: 0.01% or less of C; 0.5% or less of Si; 0.3% or less of Mn; 0.01% to 0.04% of P; 0.01% or less of S; 8% to 30% of Cr; 1.0% or less of Al; 0.05% to 0.5% of Ti; 0.04% or less of N, 8?Ti/(C+N)?30 being satisfied; and the balance being substantially Fe and incidental impurities, wherein a grain size number of ferrite grain is 6.0 or more, and an average diameter Dp of precipitation diameters, each being [(a long axis length of a Ti base precipitate +a short axis length thereof)/2], of the Ti base precipitates in the steel sheet is in the range of from 0.05 ?m to 1.0 ?m.Type: ApplicationFiled: June 16, 2003Publication date: August 11, 2005Inventors: Yoshihiro Yazawa, Osamu Furukimi, Yasushi Kato
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Patent number: RE44709Abstract: The soft Cr-containing steel includes, on a % by mass basis, C: from about 0.001% to about 0.020%, Si: more than about 0.10% and less than about 0.50%, Mn: less than about 2.00%, P: less than about 0.060%, S: less than about 0.008%, Cr: from about 12.0% to about 16.0%, Ni: from about 0.05% to about 1.00%, N: less than about 0.020%, Nb: from about 10×(C+N) to about 1.00%, Mo: more than about 0.80% and less than about 3.00%, wherein the contents of alloying elements, represented by Si and Mo, respectively, on a % by mass, satisfy the formula Si?1.2-0.4 Mo, so as to prevent precipitation of the Laves phase and to stably secure an effect of increasing high-temperature strength due to solid solution Mo.Type: GrantFiled: May 13, 2009Date of Patent: January 21, 2014Assignee: JFE Steel CorporationInventors: Atsushi Miyazaki, Junichiro Hirasawa, Mineo Muraki, Yoshihiro Yazawa, Osamu Furukimi