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| Number | Title | Issue Date |
| 7922837 | Steel sheet for vitreous enameling and method for producing the same The present invention relates to a steel sheet for Vitreous enameling excellent in enameling properties (bubbling and black spot resistance, enamel adhesiveness and fish scale resistance) and workability, and a method for producing the same, and is characterized in ... | 04/12/2011 |
| 7922838 | Crude oil tank fabricated from steel plate The present invention provides: a steel for a welded structure to be used for a crude oil tank that exhibits excellent general and local corrosion resistance in crude oil corrosion caused in a steel oil tank and is capable of suppressing the formation of corrosion p... | 04/12/2011 |
| 7850794 | Spring steel with improved hardenability and pitting resistance The present invention provides a spring steel that has superior hardenability, undergoes less pitting in a corrosive environment, and can achieve higher stress and toughness. More specifically, the present invention provides a high-strength and high-toughness spring... | 12/14/2010 |
| 7718014 | Low alloy steel and weld joint thereof excellent in corrosion resistance to hydrochloric acid and sulfuric acid The present invention provides a low alloy steel and a weld joint thereof excellent in hydrochloric acid corrosion resistance and sulfuric acid corrosion resistance, said low alloy steel containing, in mass, C: 0.001 to 0.2%, ... | 05/18/2010 |
| 7416616 | Non-heat treated steel for soft-nitriding Non-heat treated steel for soft-nitriding to form parts having high fatigue strength and excellent bend leveling property even in a case of applying soft-nitriding without thermal refining, comprising, by mass %, C: 0.30 to 0.45%, Si: 0.1 to 0.5%, Mn: 0.6 to 1.0%, T... | 08/26/2008 |
| 7413617 | Composite structure sheet steel with excellent elongation and stretch flange formability The present invention provide a TRIP-type composite structure steel plate of the TPF steel type in which elongation and stretch flange formability at room temperature are improved by controlling the morphology of the second-phase structure. In a composite structure ... | 08/19/2008 |
| 7396422 | Rolling bearing, material for rolling bearing, and equipment having rotating part using the rolling bearing The invention relates to a rolling bearing which provides superior noiselessness and high corrosion resistance and longer life, and is manufactured at a low cost, a material for the rolling bearing, and an instrument including a rotating portion using the rolling be... | 07/08/2008 |
| 7354487 | Cooled and annealed bainite steel part, and a method of manufacturing it The invention provides a method of fabricating a steel part, the method comprising the steps of: preparing and casting a steel having the following composition in percentage by weight: 0.06%≦C≦0.25%; 0.5%≦Mn≦2%; traces≦Si... | 04/08/2008 |
| 7338630 | Free-cutting steel and fuel injection system component using the same The present invention is to provide a free-cutting steel capable of suppressing production of coarse inclusions, and having a high fatigue strength and a desirable machinability. The free-cutting steel aimed at solving the foregoing problems consists essentially of,... | 03/04/2008 |
| 7329380 | Method of controlling the dimensional change when sintering an iron-based powder mixture The invention concerns a method of controlling the dimensional change to a predetermined value including the steps of providing a first powder (A) consisting of an iron based powder (1) and copper in the form of elemental copper (2), or copper diffusio... | 02/12/2008 |
| 7258756 | Very thin, high carbon steel wire and method of producing same The very thin, high carbon wire is 0.05 to 0.50 mm in diameter and comprises, in mass %, 0.90-1.20% of C, 0.05-1.2% of Si, 0.2-1.0% of Mn, and 0.0050% or less of N, with the balance being iron and impurities. In a differential scanning thermal analysis curve A of th... | 08/21/2007 |
| 7252722 | Steel sheet A steel sheet containing 0.004 to 0.02% C, 1.0% or less Si, 0.7 to 3.0% Mn, 0.02 to 0.15% P, 0.02% or less S, 0.01 to 0.1% Al, 0.004% or less N, 0.2% or less Nb, by mass %, optionally Ti, Bi or at least one element selected from the group consisting of Cr Mo, Ni and... | 08/07/2007 |
| 7105066 | Steel plate having superior toughness in weld heat-affected zone and welded structure made therefrom A welding structural steel product exhibiting a superior heat affected zone toughness, comprising, in terms of percent by weight, 0.03 to 0.17% C, 0.01 to 0.5% Si, 0.4 to 2.0% Mn, 0.005 to 0.2% Ti, 0.0005 to 0.1% Al, 0.008 to 0.030% N, 0.0003 to 0.01% 0.00 1 to 0.2%... | 09/12/2006 |
| 7076056 | Methods and apparatus for a bridge tap moderator Methods and apparatus for protecting quality of service during a process involving bridge tap in a communications system are described. Bridge tap may occur during system construction, central office re-concentration, replacement projects, upgrade projects, expansio... | 07/11/2006 |
| 7067019 | Alloy steel and article made therefrom A relatively high strength high toughness medium Carbon Copper-Nickel-Chromium alloy steel and method that eliminates and/or reduces the use of scarce, expensive alloying elements and is lower in cost than existing high strength high toughness alloy steels with comp... | 06/27/2006 |
| 7037388 | Steel plate for paint use and manufacturing method thereof A steel plate for paint use which contains C (0.12% or less), Si (1.0% or less), Mn (2.5% or less), P (0.05% or less), S (0.02% or less), and Cr (0.05% or less), Cu (0.05–3.0%), Ni (0.05–6.0%), Ti (0.025–0.15%), and Cu+Ni (0.50% or more), with PCM b... | 05/02/2006 |
| 7014915 | Controlled binary macrosegregated powder particles, their uses, and preparation methods therefor A material has a mass of powder particles. The mass of powder particles includes controlled binary macrosegregated powder particles made of at least two constituent elements. Each controlled binary macrosegregated powder particle has a chemically binary structure wh... | 03/21/2006 |
| 6962631 | Steel plate excellent in shape freezing property and method for production thereof A ferritic steel sheet wherein a mean value of X-ray random intensity ratios of a group of {100} to {223} orientations is 3.0 or more and a mean value of X-ray random intensity ratios of three crystal orientations of {554}, {111}, and {111} ... | 11/08/2005 |
| 6946038 | Steel plate having Tin+MnS precipitates for welded structures, method for manufacturing same and welded structure A weldable structural steel product having fine complex precipitates of TiN and MnS is provided which contains, in terms of percent by weight, 0.03 to 0.17% C, 0.01 to 0.05% Si, 1.0 to 2.5% Mn, 0.05 to 0.2% Ti, 0.0005 to 0.1% Al, 0.008 to 0.030% N, 0.0003 to 0.01% B... | 09/20/2005 |
| 6918548 | Electronic fuel injector An electronic fuel injector capable of supplying fuel in a stable manner is provided by employing a swirler, which is manufactured at a lower cost and has durability, and by ensuring superior wear resistance of the swirler and a valve member provided on a movable pa... | 07/19/2005 |
| 6902632 | High tensile strength cold rolled steel sheet having excellent strain age hardening characteristics and the production thereof The present invention presents a high tensile strength cold rolled steel sheet having excellent formability, impact resistance and strain age hardening characteristics, and the production thereof. As a specific means, a slab having a composition which contains, by m... | 06/07/2005 |
| 6818074 | High-ductility steel sheet excellent in press formability and strain age hardenability, and method for manufacturing the same A steel sheet composition contains appropriate amounts of C, Si, Mn, P, S, Al and N and 0.5 to 3.0% Cu. A composite structure of the steel sheet has a ferrite phase or a ferrite phase and a tempered martensite phase as a primary phase, and a secondary phase containi... | 11/16/2004 |
| 6773518 | Cold rolled steel sheet having excellent corrosion resistance to sulfuric acid A cold rolled steel sheet which has an excellent corrosion resistance to sulfuric acid, the steel includes in weight %: 0.15% or less of C, 1.0% or less of Si, 0.2˜1.5% of Mn, 0.03% or less of S, 0.03% or less of P, 0.01˜0.1% of Al, 0.2˜1.0% of Cu, 0.02˜0.2% of ... | 08/10/2004 |
| 6736910 | High carbon steel pipe excellent in cold formability and high frequency hardenability and method for producing the same The invention provides a high-carbon steel pipe having superior cold workability and induction hardenability, and a method of producing the steel pipe. The method comprises the steps of heating or soaking a base steel pipe having a composition containing C: 0.3 to 0... | 05/18/2004 |
| 6726782 | Ultra-low carbon steel sheet A steel sheet with a thickness of at least 0.30 mm is made of an ultra-low carbon steel with a chemical composition including C: at most 0.010 %, Si: at most 0.5 %, Mn: at most 1.5 %, P: at most 0.12 %, S: at most 0.030 %, Ti: at most 0.10 %, Al: at most 0.08 %, and... | 04/27/2004 |
| 6699334 | Steel sheet used for color CRT mask frame and a manufacturing method for the steel sheet This invention provides a steel sheet for a mask frame which maintains a tension-type color CRT shadow mask under tension. The steel sheet has a steel composition consisting essentially of, in mass %, C: 0.03-0.30%, Si: at most 0.30%, Mn: 0.05-1.5%, P: at... | 03/02/2004 |
| 6692584 | High tensile cold-rolled steel sheet excellent in ductility and in strain aging hardening properties, and method for producing the same The present invention provides a high tensile cold-rolled steel sheet having superior ductility, strain age-hardening characteristics, and crash resistance properties, and also provides a manufacturing method therefor. As a particular means, a thin cold-r... | 02/17/2004 |
| 6689312 | Alloy composition and improvements in mold components used in the production of glass containers An alloy and article of manufacture including parts of glass container manufacturing apparatus such as a mold and plunger having a composition which consists of Carbon 0.1 to 0.5%, preferably 0.2 to 0.3% Silicon 0 to 2% preferably 0.5 to 1.5% Manganese 0 to 2%... | 02/10/2004 |
| 6676774 | Hot rolled steel plate and cold rolled steel plate being excellent in strain aging hardening characteristics The present invention provides a steel sheet having a chemical composition comprising 0.15% or less C, 2.0% or less Si, 3.0% or less Mn, P, S, Al and N in adjusted amounts, from 0.5 to 3.0% Cu, or one or more of Cr, Mo and W in a total amount of 2.0% or l... | 01/13/2004 |
| 6645319 | Wire rod for drawing superior in twisting characteristics and method for production thereof A wire rod for drawing which is superior in drawability as well as twisting characteristics, and a method for producing the wire rod. The wire rod is characterized in that the raw material thereof is a eutectoid steel or hypereutectoid steel containing 0.... | 11/11/2003 |
| 6632296 | Steel pipe having high formability and method for producing the same The present invention provides a steel pipe excellent in formability during hydraulic forming and the like and a method to produce the same, and more specifically: a steel pipe excellent in formability having an r-value of 1.4 or larger in the axial direc... | 10/14/2003 |
| 6596098 | Wire rod for high-fatigue-strength steel wire, steel wire and method of producing the same The present invention relates to a wire rod for high fatigue-strength steel wire of small diameter, and a wire rod used in steel wire obtained by twisting these together, a steel wire and a method of producing the same. The wire rod for steel wire and the... | 07/22/2003 |
| 6589369 | High fatigue strength steel sheet excellent in burring workability and method for producing the same A compound structure steel sheet excellent in burring workability made of a steel containing, by mass, 0.01 to 0.3% of C, 0.01 to 2% of Si, 0.05 to 3% of Mn, 0.1% or less of P, 0.01% or less of S, and 0.005 to 1% or Al, and having the microstructure being... | 07/08/2003 |
| 6558483 | Cu precipitation strengthened steel The Cu precipitation strengthened steel of the invention comprises, on the mass percent basis, C: 0.02-0.10%, Mn: 0.3-2.5%, Cu: 0.50-2.0%, Ni: 0.3-4.0% and Ti: 0.004-0.03% and further comprises Si: 0.01-0.4% and/or Al: 0.001-0.1%, with the contents of inc... | 05/06/2003 |
| 6551419 | Hot-rolled steel wire and rod for machine structural use and a method for producing the same The present invention provides a hot rolled steel wire rod or bar for machine structural use having, in the as-hot-rolled condition, cold workability equal to that of the conventional wire rods or bars softened through annealing after hot rolling, and a m... | 04/22/2003 |
| 6544355 | Continuous casting steel plate for porcelain enameling excellent in formability resistance to occurrence of bubble or black point, and adhesion with porcelain enamel A vitreous enamel steel sheet produced by a continuous casting, excellent in formability, bubbling and black spot resistance and adhesiveness, which comprises, in terms of mass %, 0.002% or less of C, 0.05 to 0.2% of Mn, 0.01% or less of Si, 0.004% or les... | 04/08/2003 |
| 6454881 | Non-refined steel being reduced in anisotropy of material and excellent in strength, toughness and machinability Provided is a non heat-treated steel that requires no particular controls over cooling rates and no aging treatments after hot working, that can sufficiently increase tensile strength, yield strength and toughness even at lightly deformed parts, and furth... | 09/24/2002 |
| 6451134 | 590MPa class heavy gauge H-shaped steel having excellent toughness and method of producing the same The present invention relates to an H-shaped steel used as a building structure such as a column material or the like for highrise and super highrise building structures. In the bainite structure of extra-low-carbon steel, diffusive q is... | 09/17/2002 |
| 6436340 | Weatherable steel material Steel is obtained which comprises by wt %, C: 0.001-0.025%, Si: not more than 0.60%, Mn: 0.10-3.00%, P: 0.005-0.030%, S: not more than 0.01%, Al: not more than 0.10%, Cu: 0.1-1.5%, Ni: 0.1-6.0%, B: 0.0001-0.0050%, and the balance being Fe and inevitable i... | 08/20/2002 |
| 6395108 | Flat product, such as sheet, made of steel having a high yield strength and exhibiting good ductility and process for manufacturing this product A flat product made of multiphase steel and a method for preparing the steel includes hot rolling at a temperature at which the austenite phase is stable, then tempering to form a C and Mn-enriched phase in a matrix, followed by a heat treatment to form a... | 05/28/2002 |
