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| Number | Title | Issue Date |
| 7972452 | Method and device for the continuous creation of a bainite structure in a carbon steel, particularly in a strip steel A method continuously creates a bainite structure in a carbon steel, especially a strip steel by austenitizing the carbon steel; introducing the austenitized carbon steel into a bath containing a quenching agent; adjusting the carbon steel to the transformation temp... | 07/05/2011 |
| 7662247 | Method of producing martensite wear-resistant cast steel with film austenite for enhancement of toughness The invention provides a Martensite wear-resistant cast steel with film Austenite for enhancement of toughness comprises 0.25˜0.34 wt % C, 1.40˜2.05 wt % Si, 0.90˜1.20 wt % Mn, 1.80˜2.50 wt % Cr, 0.0005˜0.005 wt % B, 0.01˜0.06 wt % Ti, 0.015˜0.08 wt % Rare Ea... | 02/16/2010 |
| 7618503 | Method for improving the performance of seam-welded joints using post-weld heat treatment The present invention provides a method for heat-treating seam-welded constructions of hardenable steel and ferrous alloys with reduced weld-zone hardness and improved weld-zone ductility and toughness. This method consists of heating the seam weld rapidly with a se... | 11/17/2009 |
| 7431781 | Method for forming a common-rail injection system for diesel engine A common-rail injection system is provided for a diesel engine and has excellent internal pressure fatigue resisting characteristics, vibrational fatigue resisting characteristics and cavitation resisting property and sheet face flawing resisting property, and can b... | 10/07/2008 |
| 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 |
| 7367208 | Coil winding method for metal in bars Coil winding method for steel bars providing, at the outlet of the rolling mill (2), cooling stages by means of WB (4′, 4″, 4′″) and equallsation in air so as to perform “soft” hardening on the bar which generates a microstructure consistin... | 05/06/2008 |
| 7338138 | Link and producing method of the same A link has link connecting bores (15) and (16) at both ends thereof and a wear rail (13) disposed between the upper portions of the link connecting bores (15) and (16). Portions near the ends of the wear rail (13) are design... | 03/04/2008 |
| 7249638 | Impact wrench anvil and method of forming an impact wrench anvil An anvil adapted to be received within an impact wrench comprises a round body and a square head. The square head is formed at an end of the round body. A tapered ramp extends from the round body to the square head. A radius is formed in the tapered ramp. ... | 07/31/2007 |
| 7232053 | Seam-welded air hardenable steel constructions The present invention provides seam-welded, air hardenable steel tubes, methods of manufacturing seam-welded air hardenable steel tubes, tube mills for practicing such methods and applications for using seam-welded, air hardenable steel tubing of the present inventi... | 06/19/2007 |
| 7185619 | Rocker arm and method of manufacturing the same A rocker arm 1 made of sheet metal is formed so that Vickers hardness Hv of the surface layer portion 9a of the valve stem receiver 9 is set at Hv 650 to 800 and a quantity of the retained austenite γR is set at 25 ... | 03/06/2007 |
| 7147730 | High carbon steel and production method thereof To provide a high carbon steel sheet having excellent hardenability and toughness, and low planar anisotropy of tensile properties affecting workability, and a method of producing the same. A high car steel sheet having chemical composition specified by JIS G... | 12/12/2006 |
| 7096075 | Apparatus, method and program for physical state controller For determination as to whether there is a possibility that temperature control satisfying conditions according to an upper limit LH_i and a lower limit LL_i of the annealing control temperatures of annealing object steel sections i will be realized under restrictio... | 08/22/2006 |
| 7090731 | High strength steel sheet having excellent formability and method for production thereof A high strength steel sheet having (2-1) a base phase structure, the base phase structure being tempered martensite or tempered bainite and accounting for 50% or more in terms of a space factor relative to the whole structure, or the base phase structure comprising ... | 08/15/2006 |
| 7083688 | High-strength race and method of producing the same The high-strength race of the present invention comprises using A steel for a high-strength race comprising the following elements in percentage by weight: C: 0.30 to 0.60%, Si: 0.30 to 1.30%, Mn: 0.5 to 1.5%, B: 0.0050% or less, Cr: 0.1 to 0.5%, Mo: 0.1 to 0.5%, Si... | 08/01/2006 |
| 7070666 | Machinable austempered cast iron article having improved machinability, fatigue performance, and resistance to environmental cracking and a method of making the same A machinable austempered cast iron article has improved strength, machinability, fatigue performance, and resistance to environmental cracking. A method of making the machinable austempered cast iron article includes austenitizing an iron composition having a substa... | 07/04/2006 |
| 7037383 | Process for producing a component from metal A process for producing a component of metal includes a) carrying out a heat treatment to harden the component, which ends with a heating process, especially with a tempering or microstructural transformation process, at a given temperature (TE); b) carry... | 05/02/2006 |
| 7008488 | High-strength steel sheet having excellent workability and production process therefor A high-strength steel sheet comprises carbon: 0.06 to 0.25 mass %, Si: 0.5 to 3.5 mass % and Mn: 0.7 to 4 mass %. Its mother structure is ferrite, its second phase structure comprises martensite and the residual austenite and the second phase structure measured by i... | 03/07/2006 |
| 6958099 | High toughness steel material and method of producing steel pipes using same A steel material and a steel pipe made by using the same are provided which are to be used in severe oil well environments. Such a highly tough oil well steel pipe can be produced by rolling the base material, quenching the rolling product from the austenite region ... | 10/25/2005 |
| 6955730 | Method for enhancing the metallurigcal quality of products treated in a furnace The method and apparatus for enhancing the metallurgical quality of products treated in a furnace with several zones, wherein the temperature and the atmospheric conditions can be controlled. The applies to any type of product treated in a furnace, such as billets, ... | 10/18/2005 |
| 6902631 | Air-hardening, low to medium carbon steel for improved heat treatment A steel to be air-hardened as part of heat treatments such as hardening-and-tempering, induction hardening, carburizing, carbonitriding or nitriding comprising, in weight %: | 06/07/2005 |
| 6899773 | Fine-grained martensitic stainless steel and method thereof An iron based, fine-grained, martensitic stainless steel essentially free of delta ferrite has a nominal composition of (wt. %): 0.05 | 05/31/2005 |
| 6890393 | Fine-grained martensitic stainless steel and method thereof An iron based, fine-grained, alloy. ... | 05/10/2005 |
| 6890665 | Martensitic stainless steel and method for manufacturing the same Martensitic stainless steel whose steel composition is restricted within a specific range for each element is provided. The scale layer formed on the surface of the base material consists of an inner layer scale mainly including FeCr2O4 and an ... | 05/10/2005 |
| 6878219 | High strength steel pipe for an air bag and a process for its manufacture 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: ... | 04/12/2005 |
| 6843867 | Method of austempering steel parts A method of austempering of steel parts is described. The steel parts are initially austenitized and subsequently quenched to a start temperature which is higher than the martensite start temperature. Then the steel parts are subjected to a first isothermal holding ... | 01/18/2005 |
| 6808571 | Heat resistant carburized rolling bearing component and manufacturing method thereof A heat resistant carburized rolling bearing component is formed of a steel material at least containing, as alloy elements in a matrix, by mass %, at least 0.1% and at most 0.4% of C, at least 0.3% and at most 3.0% of Si, at least 0.2% and at most 2.0% of Mn, at mos... | 10/26/2004 |
| 6802915 | Manufacturing method of a pushing block for a CVT belt A pushing block for the CVT belt has a hyper-eutectoid structure overall and exhibiting a structure in which spheroidal cementite having an area percentage of 0.4% or more are dispersed in a matrix of a martensite. ... | 10/12/2004 |
| 6786980 | Steel product and method for manufacturing A method for providing a steel product having a surface hardness of between about 360 Bhn and 420 Bhn is provided. The method includes steps of providing a steel product from a steel product comprising at least about 96 wt. % iron and between about 0.24 wt. % and ab... | 09/07/2004 |
| 6743311 | Forging method The objective of the present invention is to provide a forging method that improves workability in machining, by turning the metallographical structure of products subject to impact load to a fine ferrite-perlite structure, without adopting the method of quenching a... | 06/01/2004 |
| 6702905 | Corrosion and wear resistant alloy An iron-based corrosion resistant and wear resistant alloy. The alloy can comprise (in weight percent) 0.005-0.5% boron, 1.2-1.8% carbon, 0.7-1.5% vanadium, 7-11% chromium, 1-3.5% niobium, 6-11% molybdenum, and the balance including iron and incidental im... | 03/09/2004 |
| 6663726 | High-hardness prehardened steel for cold working with excellent machinability, die made of the same for cold working, and method of working the same There are provided a high-hardness prehardened steel for cold working having excellent machinability containing, by mass, not less than 0.3% but less than 0.5% C, 0.7 to 2.0% Si, and 0.08 to 0.25% S, a die for cold working which is fabricated by cutting t... | 12/16/2003 |
| 6652681 | Method of reheating metallurgical products Method of reheating metallurgical products, in which solid products, especially steel products, are reheated so as to bring them from a temperature substantially below 400° C. to a temperature of at least about 1000° C. by passing them through a furnace... | 11/25/2003 |
| 6632303 | Stress relieved grinding ball having hard outer shell A grinding ball having a 55 to 65 Rockwell C hardened outer shell of tempered martensite is adapted for use in a heavy duty grinding environment by stress relieving to stabilize the ball against break-up and/or spalling.... | 10/14/2003 |
| 6592685 | Transformation controlled nitride precipitation hardening heat treatable steel The invention relates to a transformation controlled nitride precipitation hardening heat-treatable steel with the following composition (data in wt. %): 15-18 Cr, max. 0.5 Mn, 4-10 Ni, max. 15 Co, max. 4 W, max. 4 Mo, 0.5-1 V, at least one of Nb, Ta, Hf ... | 07/15/2003 |
| 6565991 | Composite doctor blade and its method of manufacture A composite doctor blade comprises a steel support band configured with a width and thickness suitable for mounting in a blade holder, with tensile and yield strengths suitable for a selected doctoring application. A wear resistant strip of high speed ste... | 05/20/2003 |
| 6565682 | Process for producing high-strength heat-resistant pipe An object is to provide a heat-resistant steel which can be produced at a low cost but possesses an excellent high-temperature strength. A high-strength heat-resistant steel is provided which comprises C in an amount of 0.06 to 0.15% by weight, Si in an a... | 05/20/2003 |
| 6540847 | Rolling structure steel Rolling structure steel, comprising: 0.90-100% by wt. C; 0.95-1.05% by wt Si; 0.25-0.45% by wt Mn; 0.015% by wt. S max.; 0.025% by wt. P max.; 1.30-1.50% by wt. Cr, and 0.17-0.20% by wt. Mo. Preferably this steel is produced by austenising at 860+20° C.,... | 04/01/2003 |
| 6531007 | Method for the manufacture of steel products of a precipitation hardened martensitic steel, steel products obtained with such method and use of said steel products A method for the manufacture of steel products and products thus produced, wherein steel is subjected to precipitation hardening in a martensitic structure subsequent to soft annealing and thereafter shaping. The method steps include shaping followed by s... | 03/11/2003 |
| 6494970 | Heat resistant steel casting and method of manufacturing the same Disclosed is a heat resistant steel casting, comprising C, 0.15-0.3%, Si, 0.1-0.30%, Mn, 0.01-0.1%, Cr, 2.0-2.5%, Mo, 0.3-0.8%, V, 0.23-0.3%, W, 1.6-2.6%, N, 0.005-0.03%, B, 0.001-0.004%, impurity elements including Ni not larger than 0.2%, P not larger t... | 12/17/2002 |
| 6491768 | Anti-friction bearing and method for fabricating anti-friction & bearing A bearing and a method for fabricating a bearing. The bearing is intended to be used in office automation equipment and the like is improved in impact resistance and load capacity. Its rotational accuracy will not deteriorate in long-term use and its quie... | 12/10/2002 |
