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| Number | Title | Issue Date |
| 8177924 | High-strength steel sheet and process for producing the same A high-strength steel sheet comprises a metallic structure consisting of a ferrite phase and a hard second phase dispersed in the ferrite phase, the hard second phase in the metallic structure having an area ratio of 30 to 70%, and the ferrite of which grain sizes a... | 05/15/2012 |
| 8147623 | Steel pipe as fuel injection pipe To provide a steel pipe as a fuel injection pipe with high material strength, high internal pressure limit free from fatigue failure, prolonged fatigue life, and high reliability. A steel pipe as a fuel injection pipe of 500 N/mm2 or higher tensile streng... | 04/03/2012 |
| 8142574 | Steel product for welding A steel product for welding includes the following component: by mass %, C: 0.3% or less, Si: 0.5% or less, Mn: 0.3˜2%, P: 0.03% or less, S: 0.03% or less, Al: 0.3˜5%, O: 0.003˜0.01%, and N: 0.006% or less; wherein the balance is composed of Fe and inevitable imp... | 03/27/2012 |
| 8133330 | High yield ratio and high-strength hot-dip galvanized steel sheet excellent in workability and production method thereof A high-strength hot-dip galvanized steel sheet excellent in workability according to the present invention: contains C, Si, Mn and other elements; has a dual phase structure containing ferrite and martensite as the metallographic structure; and, in the ferrite struc... | 03/13/2012 |
| 8128762 | High-strength steel sheet superior in formability Disclosed is a high-strength steel sheet which has a predetermined component composition, structurally has a ferrite matrix structure and bainitic and martensitic second phase structures, and has a ferrite fraction of from 50 to 86 percent by area, a bainite fractio... | 03/06/2012 |
| 8097095 | Hardfacing material A method of producing a hard metallic material by forming a mixture containing at least 55% iron and at least one of boron, carbon, silicon and phosphorus. The mixture is formed into an alloy and cooled to form a metallic material having a hardness of greater than a... | 01/17/2012 |
| 8097096 | Fire resistant steel excellent in high temperature strength, toughness, and reheating embrittlement resistance and process for production of the same The present invention provides a fire resistant steel material excellent in high temperature strength, toughness, and reheating embrittlement resistance containing, by mass %, C: 0.001% to 0.030%, Si: 0.05% to 0.50%, Mn: 0.4% to 2.0%, Nb: 0.03% to 0.50%, Ti: 0.005% ... | 01/17/2012 |
| 8070887 | High-strength steel sheet and high-strength steel pipe excellent in deformability and method for producing the same The present invention provides a line pipe of, e.g., the API standard X60 to X100 class. The line pipe has an excellent deformability, as well as excellent low temperature toughness and high productivity, a steel plate used as the material of the steel pipe. Methods... | 12/06/2011 |
| 8070889 | High-strength steel sheet and galvanized steel sheet having very good balance between hole expansibility and ductility, and also excellent in fatigue resistance, and methods of producing the steel sheets The invention is directed to providing, for application in automobiles, construction materials, household appliances and the like, high-strength sheets excellent in formability properties such as hole expansibility and ductility, and also in fatigue resistance, char... | 12/06/2011 |
| 8070888 | High strength formed article comprising hyperfine grain structure steel and manufacturing method of the same A wire rod or a steel wire of a bamboo nano-structure, whose mean grain diameter in a C-direction section is 200 nm or smaller, is prepared by applying a hot or warm working and additionally applying a cold working to a steel and next, by performing a forging, by a ... | 12/06/2011 |
| 8052807 | Steel sheet excellent in workability The present invention provides a steel sheet excellent in workability, which may be used for components of an automobile or the like, and a method for producing the same. More specifically, according to one exemplary embodiment of the present invention, a steel shee... | 11/08/2011 |
| 8048238 | High young's modulus steel plate and method of production of same Steel sheet having a composition of ingredients containing substantially, by mass %, C: 0.005 to 0.200%, Si: 2.50% or less, Mn: 0.10 to 3.00%, N: 0.0100% or less, Nb: 0.005 to 0.100%, and Ti: 0.002 to 0.150% and satisfying the relationship of Ti−48/14×N≧0.0005,... | 11/01/2011 |
| 8048237 | Ultra soft high carbon hot rolled steel sheet and method for manufacturing same An ultra soft high carbon hot-rolled steel sheet has excellent workability. The steel sheet is a high carbon hot-rolled steel sheet containing 0.2 to 0.7% C, and has a structure in which mean grain size of ferrite is 20 μm or larger, the volume percentage of ferrit... | 11/01/2011 |
| 8038809 | High strength hot rolled steel sheet excellent in bore expanding workability and method for production thereof A high-strength hot-rolled steel sheet containing C: 0.05 to 0.15%, Si: no more than 1.50% (excluding 0%), Mn: 0.5 to 2.5%, P: no more than 0.035% (excluding 0%), S: no more than 0.01% (including 0%), Al: 0.02 to 0.15%, and Ti: 0.05 to 0.2%, which is characterized i... | 10/18/2011 |
| 8007601 | Methods of producing high-strength metal tubular bars possessing improved cold formability A method for producing a tubular bar, more particularly a stabilizer bar, is provided. The method comprises providing a tubular bar of desired size having an outer and inner surface, heating the bar to an elevated temperature, quenching the bar by application of a c... | 08/30/2011 |
| 8002908 | Steel product with a high austenite grain coarsening temperature A steel product with a high austenite grain coarsening temperature having less than 0.4% carbon, less than 0.06% aluminium, less than 0.01% titanium, less than 0.01% niobium, and less than 0.02% vanadium by weight, and having fine oxide particles containing silicon ... | 08/23/2011 |
| 7981224 | Multi-phase steel sheet excellent in hole expandability and method of producing the same The present invention provides a steel sheet excellent in both a balance between strength and elongation and a balance between strength and hole expandability, in other words, a multi-phase steel sheet having an excellent balance between strength and hole expandabil... | 07/19/2011 |
| 7972451 | Pearlitic steel rail excellent in wear resistance and ductility and method for producing same The present invention is: a pearlitic steel rail excellent in wear resistance and ductility, characterized in that, in a steel rail having pearlite structure containing, in mass, 0.65 to 1.40% C, the number of the pearlite blocks having grain sizes in the range from... | 07/05/2011 |
| 7931757 | Seamless steel pipe for line pipe and a process for its manufacture A thick-walled seamless steel pipe for line pipe which has a high strength and improved toughness and corrosion resistance in spite of the thick wall and which is suitable for use as a riser and flow line has a chemical composition comprising, in mass percent, C: 0.... | 04/26/2011 |
| 7927433 | Cold-rolled steel sheet A cold-rolled steel sheet of carbon steel or low-alloy steel comprising C: 0.01 to 0.25% by mass with a ferrite main phase is has an average ferrite crystal grain diameter D (μm) at the depth of ¼ of the sheet thickness from the steel sheet surface satisfying form... | 04/19/2011 |
| 7922835 | High strength steel sheet excellent in formability A high strength steel sheet excellent in formability which has a chemical composition in mass %: C: 0.03 to 0.20%, Si: 0.005 to 0.3%, Mn: 1.0 to 3.1%, P: 0.001 to 0.06%, S: 0.001 to 0.01%, N: 0.0005 to 0.01%, Al: 0.2 to 1.2%, Mo≦0.5%, and the balance: Fe and inevi... | 04/12/2011 |
| 7850793 | Hot milled wire rod excelling in wire drawability and enabling avoiding heat treatment before wire drawing A hot-rolled wire rod: the wire rod being a hot-rolled wire rod 5.0 mm or more in diameter, containing in mass C: 0.6 to 1.0%, Si: 0.1 to 1.5%, Mn: 0.3 to 1.0%, P: 0... | 12/14/2010 |
| 7846274 | High strength steel pipe for an air bag In order to manufacture a steel pipe for an air bag which can cope with increase in the pressure of gas blown into an air bag and decreases in the wall thickness of an accumulator, a steel having a composition, mass %, of: C: 0.05-... | 12/07/2010 |
| 7828912 | High-strength hot-rolled steel shaft excellent in hole expandability and ductility and production method thereof This invention provides a high-strength hot-rolled steel sheet having strength of at least 980 N/mm2 at a sheet thickness of from about 1.0 to about 6.0 mm and excellent in hole expandability, ductility and ability of phosphate coating, which steel sheet ... | 11/09/2010 |
| 7824508 | Fine grain surface layer steel part and method of production of same The present invention provides a fine grain surface layer steel part having a high proof strength ratio equal to or higher than that of conventional quenched and tempered materials, that is, a fine grain surface layer steel part containing, by mass %, C: 0.45% to 0.... | 11/02/2010 |
| 7806992 | Hot forged product with excellent fatigue strength, method for making the same, and machine structural part made from the same A hot forged product including hardened areas introduced by partial cooling after hot forging, and unhardened areas, wherein Vickers hardness V1 of the hardened areas on the surface and Vickers hardness V2 of the unhardened areas satisfy the fo... | 10/05/2010 |
| 7780797 | High strength thin steel excellent in hole expansibility, ductility and chemical treatment characteristics High strength hot rolled steel sheet having at least a 590 N/mm2 tensile strength and excellent in elongation and ability of phosphate coating, that is, high strength hot rolled steel sheet excellent in burring, elongation, and ability of phosphate coatin... | 08/24/2010 |
| 7776160 | Method of producing a cold temperature high toughness structural steel tubing An apparatus (10) includes a low-carbon steel tube (24). The low-carbon steel tube (24) yields plastically more than about 5% before fracturing at temperatures down to about −40° C. when stress is applied to the low-carbon steel tube sufficie... | 08/17/2010 |
| 7767036 | High strength cold rolled steel sheet and plated steel sheet excellent in the balance of strength and workability A high-strength cold-rolled steel sheet exhibiting an excellent strength-workability balance, including in percent by mass: 0.10-0.25% of C; 1.0-2.0% of Si; 1.5-3.0% of Mn; 0.01% o... | 08/03/2010 |
| 7754029 | Steel with excellent delayed fracture resistance and tensile strength of 1801 MPa class or more, and its shaped article Steel and steel shaped articles with an excellent delayed fracture resistance and a tensile strength of the 1600 MPa class or more, containing, by mass %, C: 0.20 to 0.60%, Si: 0.50% or less, Mn: over 0.10% to 3%, Al: 0.005 to 0.1%, Mo: over 3.0% to 10%, and, as nee... | 07/13/2010 |
| 7754030 | High strength steel sheet and method for production thereof A high-strength steel sheet has a metal structure consisting of a ferrite phase in which a hard second phase is dispersed and has 3 to 30% of an area ratio of the hard second phase. In the ferrite phase, the area ratio of nanograins of which grain sizes are not more... | 07/13/2010 |
| 7749338 | High burring, high strength steel sheet excellent in softening resistance of weld heat affected zone and method of production of same The present invention provides high burring, high strength steel sheet excellent in softening resistance of the weld heat affected zone and a method of production of the same, that is, high burring, high strength steel sheet excellent in softening resistance of the ... | 07/06/2010 |
| 7736447 | Steel plates for ultra-high-strength linepipes and ultra-high-strength linepipes having excellent low-temperature toughness and manufacturing methods thereof Ultra-high-strength linepipes having excellent low-temperature toughness manufactured by welding together the edges of steel plates comprising C of 0.03 to 0.07 mass %, Si of not more than 0.6 mass %, Mn of 1.5 to 2.5 mass %, P of not more than 0.015 mass %, S of no... | 06/15/2010 |
| 7731808 | Hot-rolled steel sheet and cold-rolled steel sheet and manufacturing method thereof A steel sheet excellent in mechanical strength, workability and thermal stability and suited for use as a raw material in such fields of manufacturing automobiles, household electric appliances and machine structures and of constructing buildings, and a manufacturin... | 06/08/2010 |
| 7727341 | Cylinder head gasket A gasket system is described and depicting having a gasket located between and sealing a cylinder head and a cylinder block. The gasket has a first metal layer and a second metal layer adjacent said first metal layer. The second metal layer has a bead region and a s... | 06/01/2010 |
| 7686896 | High-strength steel sheet excellent in deep drawing characteristics and method for production thereof A high-strength steel sheet is useful for applications to automobile steel sheets and the like and has excellent deep drawability, a tensile strength (TS) of as high as 440 MPa or more, and a high r value (average r value ≧1.2), and a process for producing the ste... | 03/30/2010 |
| 7670444 | Non-heat treated steel for hot forging with easy fracture splitting Disclosed is a non-heat treated steel for hot forging, particularly suitable for producing connecting rods of automobile engines. The steel consists essentially of: by weight, C: 0.3-0.8%, Si: 0.1-2.0%, Mn: 0.3-1.5%, P: 0.01-0.15%, Cr: 0-1.0%, V: 0-0.4%, Al: 0-0.05%... | 03/02/2010 |
| 7662243 | Hot rolled steel sheet An exemplary hot rolled steel sheet can included, in terms of percent by mass, C of 0.01 to 0.2%; Si of 0.01 to 2%; Mn of 0.1 to 2%; P of ≦0.1%; S of ≦0.03%; Al of 0.001 to 0.1%; N of ≦ 0.01%; and as a remainder, Fe and unavoidable impurities. For example, a m... | 02/16/2010 |
| 7628869 | Steel composition, articles prepared there from, and uses thereof An article as disclosed herein comprises a steel comprising carbon in an amount greater than 0.18 weight percent and less than or equal to 0.23 weight percent by ladle analysis, wherein a test article consisting of the steel has a low temperature Charpy V-notch toug... | 12/08/2009 |
| 7608155 | High strength, hot dip coated, dual phase, steel sheet and method of manufacturing same A galvanized steel sheet having (a) a dual phase microstructure with a martensite phase and a ferrite phase and (b) a composition containing by percent weight: carbon in a range from about 0.01% to about 0.18%; manganese in a range from about 0.2% to about 3%; silic... | 10/27/2009 |
