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| Number | Title | Issue Date |
| 8152939 | Non-heat treated connecting rod and method of manufacturing the same A non-heat treated connecting rod which comprises, by mass %, C: 0.25-0.35%, Si: 0.50-0.70%, Mn: 0.60-0.90%, P: 0.040-0.070%, S: 0.040-0.130%, Cr: 0.10-0.20%, V: 0.15-0.20%, Ti: 0.15-0.20% and N: 0.002-0.020%, and the balance Fe and impurities, with chemical composi... | 04/10/2012 |
| 8043444 | Steel wire for cold-formed spring excellent in corrosion resistance and method for producing the same A steel wire for a cold-formed spring according to the present invention contains a prescribed chemical component composition, wherein: a martensitic transformation start temperature MS1 shown by the following expression (1) is in the range from 280° C. ... | 10/25/2011 |
| 8034199 | Case-hardening steel excellent in cold forgeability and low carburization distortion property This invention provides a case-hardening steel excellent in cold forgeability and low carburization distortion property that exhibits low deformation resistance and high limit compressibility when cold, namely, a case-hardening steel excellent in cold forgeability a... | 10/11/2011 |
| 8002909 | Medical devices Alloy compositions suitable for fabricating medical devices, such as stents, are disclosed. In certain embodiments, the compositions have small amounts of nickel, e.g., the compositions can be substantially free of nickel. ... | 08/23/2011 |
| 7955445 | Internal high hardness type pearlitic rail with excellent wear resistance and rolling contact fatigue resistance and method for producing same An internal high hardness type pearlitic rail that has a composition containing 0.73% to 0.85% by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn, 0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2% to 1.3% by mass Cr, and the balance being Fe and ... | 06/07/2011 |
| 7901520 | Spring wire rod excelling in fatigue characteristics Disclosed herein is a spring wire rod excelling in fatigue characteristics. It contains TiN inclusions having a specific size defined by the ratio of each group in all the visual fields as follows: (1) Visual fields in which the maximum thickness is no ... | 03/08/2011 |
| 7887648 | Ultrahigh-strength thin steel sheet The invention relates to an ultrahigh-strength thin steel sheet excellent in the hydrogen embrittlement resistance, the steel sheet including, by weight %, 0.10 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, 0.15% or less of P, 0.02% or less of S, 1.5% or less... | 02/15/2011 |
| 7879160 | Cold rolled dual-phase steel sheet A steel sheet having (a) a dual phase microstructure with a martensite phase and a ferrite phase and (b) a composition containing by percent weight: 0.01% to 0.2% C; 0.3% to 3% Mn; 0.05% to 2% Si; 0.1% to 2% Cr; 0.01% to 0.10% Al; and 0.0005% to 0.01% Ca, with the b... | 02/01/2011 |
| 7875130 | Crude oil tank comprising a corrosion resistant steel alloy 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... | 01/25/2011 |
| 7862667 | Steels for sour service environments Embodiments of the present application are directed towards steel compositions that provide improved properties under corrosive environments. Embodiments also relate to protection on the surface of the steel, reducing the permeation of hydrogen. Good process control... | 01/04/2011 |
| 7854808 | Steel sheet for vitreous enameling and production method To provide a non-aging steel sheet for vitreous enameling, the steel sheet being excellent in resistance to bubbles and black spots, without the employment of decarbonization and denitrification annealing that raises the cost of production and also without the addit... | 12/21/2010 |
| 7789974 | High-strength spring steel wire The present invention provides a spring steel having both a high strength and a good coiling property after heat treatment, characterized by: containing, in mass, C: 0.4 to 1.2%, Si: 0.9 to 3.0%, Mn: 0.1 to 2.0%, P: 0.015% or less, S: 0.015% or less, Cr: 2.5% or les... | 09/07/2010 |
| 7749339 | Process for manufacturing an airbag inflator bottle member An airbag inflator bottle member comprising a tubular body having a reduced-diameter portion at an end portion for fitting an initiator or the like thereto in which the reduced-diameter portion has a good low temperature toughness comparable to that of the portion w... | 07/06/2010 |
| 7699943 | Method for manufacturing high-strength spring The present invention intends to provide a method for manufacturing a high-strength spring, which is capable of generating a higher level of compressive residual stress than that given by conventional methods. This object is achieved as follows: After the final heat... | 04/20/2010 |
| 7691213 | Case hardened gear and method of producing the same There is provided an inexpensive rolling element used under high interface pressure such as induction hardened gears, the rolling element being improved in the seizure resistance of its tooth flanks and having a temper hardness of HRC 50 or more at 300° C. To this ... | 04/06/2010 |
| 7682467 | High strength hot rolled steel sheet superior in workability, fatigue property, and surface quality Disclosed is a high-strength hot-rolled steel sheet containing C in a range of 0.03 to 0.15 mass %, Mn in a range of 0.5 to 2 mass %, and Al in a range of 0.01 to 0.1 mass %, respectively, while controlling S to not more than 0.02 mass % (0% included), wherein the m... | 03/23/2010 |
| 7575646 | Heat-treated steel wire for high strength spring The present invention provides a steel wire, for springs excellent in coiling property while having a high strength, as a heat treated steel wire for high strength springs, characterized by: comprising, in mass, C: 0.75 to 0.85%, Si: 1.5 to 2.5%, Mn: 0.5 to 1.0%, Cr... | 08/18/2009 |
| 7556701 | Method for cooling hot roller steel strip, and method for manufacturing hot rolled steel strip A method for cooling a hot rolled steel strip including transferring a hot rolled steel strip while ejecting cooling water from a cooling means at a specified ejecting condition; pinching a top end of the hot rolled steel strip by a pinching roll, at the inlet of th... | 07/07/2009 |
| 7438770 | High strength spring steel having excellent hydrogen embrittlement resistance The present invention provides a high strength steel used for spring steel that has excellent hydrogen embrittlement resistance. The high strength steel which spring steel having excellent hydrogen embrittlement resistance comprises 0.20 to 0.60% of C, 1.0 to... | 10/21/2008 |
| 7429301 | Ultra clean spring steel Disclosed herein is an ultra clean spring steel which contains inclusions easily elongated and broken into fine particles by hot rolling and which is easily adaptive to cold rolling and yields springs excelling in fatigue characteristics. The spring steel is charact... | 09/30/2008 |
| 7422643 | Rolling element and method of producing the same There is provided an inexpensive rolling element used under high interface pressure such as induction hardened gears, the rolling element being improved in the seizure resistance of its tooth flanks and having a temper hardness of HRC 50 or more at 300° C. To this ... | 09/09/2008 |
| 7416615 | Very-high-strength and low-density, hot-rolled steel sheet and manufacturing process The invention relates to a high-resistant, low-density hot laminated sheet steel comprising the following elements expressed in weight per cent: 0.04%:9 carbon≦0.5%; 0.05%≦manganese≦3%, being able to contain hardening elements: 0.01%≦niobium≦0.1 0.01%≦ti... | 08/26/2008 |
| 7393420 | Steel tube for bearing element parts and method of manufacturing as well as machining the same Steel tubes for bearing element parts according to the present invention, wherein the specific compositions are limited and an accumulation intensity of {211} face along with an impact property at ambient temperature in the longitudinal direction of steel tube are s... | 07/01/2008 |
| 7387691 | Hot forged non-heat treated steel for induction hardening A hot forged non-heat treated steel for induction hardening, comprising by mass percent, C: 0.35 to 0.45%, Si: 0.20 to 0.60%, Mn: 0.40 to 0.80%, S: 0.040 to 0.070%, Cr: 0.10 to 0.40%, Ti: 0.020 to 0.100%, Ca: 0.0005 to 0.0050%, B: 0.0005 to 0.0030%, O: 0.0015 to 0.0... | 06/17/2008 |
| 7381369 | Free cutting alloy Provided is free cutting alloy excellent in machinability, preserving various characteristics as alloy. The free cutting alloy contains: one or more of Ti and Zr as a metal element component; and C being an indispensable element as a bonding component with the metal... | 06/03/2008 |
| 7371293 | Cold finished seamless steel tubes Cold finished seamless steel tubes are made such that the residual stress F to be generated at the stage of the correction process after cold working is controlled to be 30 MPa or more and the scattering thereof is 30 MPa or less, when measured by Crampton method. F... | 05/13/2008 |
| 7371294 | High-strength cold-rolled steel sheet having outstanding elongation and superior stretch flange formability and method for production therof A high-strength cold-rolled steel sheet is disclosed that comprises a steel including C: 0.05 to 0.13 mass %, Si: 0.5 to 2.5 mass %, and Mn: 0.5 to 3.5 mass %, as well as Mo: 0.05 to 0.6 mass % and/or Cr: 0.05 to 1.0 mass %. The steel sheet is of composite structure... | 05/13/2008 |
| 7347904 | Low carbon steel sheet and low carbon steel slab and process for producing same The present invention provides a low carbon steel sheet and a low carbon steel slab on which formation of surface defects can be surely prevented by preventing aggregation of inclusions in the molten steel and finely dispersing inclusions in the steel sheet or slab,... | 03/25/2008 |
| 7316143 | Seamless steel tubes and method for producing the same A seamless steel tube comprising, in mass %, C: 0.30 to 0.50%, Si: 0.5% or less, Mn: 0.3 to 2.0%, P: 0.025% or less, S: 0.005% or less, Cr: 0.15 to 1.0%, Al: 0.001 to 0.05%, Ti: 0.005 to 0.05%, N: 0.02% or less, B: 0.0005 to 0.01% and O (oxygen): 0.0050% or less, wh... | 01/08/2008 |
| 7314532 | High-strength forged parts having high reduction of area and method for producing same A high-strength forged part is disclosed which comprises a base phase structure, comprising 30% or more of ferrite in terms of a space factor, and a second phase structure, comprising bainite and/or martensite, and retained austenite having an average grain diameter... | 01/01/2008 |
| 7261955 | MCrAlX alloy and turbine component having protective layer made from MCrAlX alloy Protective layers of the MCrAlX type according to the prior art are often provided with a platinum layer to prevent diffusion of elements out of the base material into the MCrAlX. The MCrAlX alloy according to the invention includes halogens (F, Cl, Br, I), which pr... | 08/28/2007 |
| 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 |
| 7252721 | Power transmission shaft A power transmission shaft having an improved strength and ensuring a stable torsion fatigue strength. The power transmission shaft has coupling members respectively provided on the opposite ends of an pipe part made of a steel material. The steel material includes ... | 08/07/2007 |
| 7229507 | High speed tool steel A high speed tool steel, which is high in impact value and free from variations in tool performance, comprising, by mass %, of: 0.4≦C≧0.9; Si≦1.0; Mn≦1.0; 4≦Cr≧6; 1.5–6 in total of either or both of W and Mo in the form of (½W+Mo) wherein W≦3; 0.5â€... | 06/12/2007 |
| 7217329 | Carbon-titanium steel rail An improved steel railroad rail, and methods for producing same, having a carbon content in a range from 0.7 to 0.95 wt % and titanium in the range of 0.005 to 0.105 wt % is provided that has increased wear resistance and increased fracture toughness over convention... | 05/15/2007 |
| 7214278 | High-strength four-phase steel alloys A carbon steel alloy that exhibits the combined properties of high strength, ductility, and corrosion resistance is one whose microstructure contains ferrite regions combined with martensite-austenite regions, with carbide precipitates dispersed in the ferrite regio... | 05/08/2007 |
| 7211159 | Ferritic heat-resistant steel and method for production thereof A ferritic heat-resistant steel, which exhibits excellent creep characteristics even at a high temperature exceeding 600° C., comprises, on the basis of percent by weight, 1.0 to 13% of chromium, 0.1 to 8.0% of cobalt, 0.01 to 0.20% of nitrogen, 3.0% or less of nic... | 05/01/2007 |
| 7169239 | Solid expandable tubular members formed from very low carbon steel and method A very low carbon steel alloy is provided for use in manufacturing tubular members such as oil country tubular goods. The tubular members may be radially expanded from at least twenty percent to forty percent. Sections or joints of casing formed from the steel alloy... | 01/30/2007 |
| 7155902 | Structure for fixing catalytic body to exhaust pipe For fixing a catalytic body, which has a cylindrical case and is housed in an exhaust pipe, to the exhaust pipe that serves as part of an exhaust system connected to an engine. The catalytic body can be housed in and fixed to the exhaust pipe even if the catalytic b... | 01/02/2007 |
| 7128791 | Heat-resistant martensite alloy excellent in high-temperature creep rupture strength and ductility and process for producing the same The present invention provides a martensitic heat resistant alloy having a composition (A) comprising, % by weight: 0.03 to 0.15% of C; 0.01 to 0.9% of Si: 0.01 to 1.5% of Mn; 8.0 to 13.0% of Cr; 0.0005 to 0.015% of Al; no more than 2.0% of Mo; no more than 4.0% of ... | 10/31/2006 |
