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| Number | Title | Issue Date |
| 7767044 | Method for heat-treating steel material Disclosed is an efficient heat treatment method which can be performed in a short time. Specifically disclosed is a method for heat-treating a steel material wherein a plastically deformed steel work is introduced into a heat treatment furnace when the work still re... | 08/03/2010 |
| 7459040 | Method for making a steel article with carbides already in the steel and no deformation used in the process The invention is a method of making a steel article comprising carbide banding by using steel with undissolved carbides distributed within the steel, wherein the steel is about 0.3 weight percent to about 2.2 weight percent carbon and at least 0.003 weight percent o... | 12/02/2008 |
| 7341765 | Metallic coatings on silicon substrates, and methods of forming metallic coatings on silicon substrates The invention includes methods of forming a metallic coating on a substrate which contains silicon. A metallic glass layer is formed over a silicon surface of the substrate. The invention includes methods of protecting a silicon substrate. The substrate is provided ... | 03/11/2008 |
| 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 |
| 7118637 | Nano-composite martensitic steels Carbon steels of high performance are disclosed that contain dislocated lath structures in which laths of martensite alternate with thin films of austenite, but in which each grain of the dislocated lath structure is limited to a single microstructure variant by ori... | 10/10/2006 |
| 7074286 | Wrought Cr—W—V bainitic/ferritic steel compositions A high-strength, high-toughness steel alloy includes, generally, about 2.5% to about 4% chromium, about 1.5% to about 3.5% tungsten, about 0.1% to about 0.5% vanadium, and about 0.05% to 0.25% carbon with the balance iron, wherein the percentages are by total weight... | 07/11/2006 |
| 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 |
| 6913449 | Apparatus for the treatment of metallic workpieces with cooling gas In an apparatus for the treatment of metallic workpieces (4) with cooling gas, having a cylindrical housing (3) with an opening at the end face for introducing and removing the workpieces (4), two support plates (6, 7) extending in parall... | 07/05/2005 |
| 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 |
| 6896746 | Hot-rolled steel wire rods and bars usable for machine structural use without annealing and method for producing the same A steel wire rods and bars for machine structural use having, in the as-hot-rolled state, the same cold workability as a conventional steel wire rods and bars subjected to softening annealing after hot rolling, and a production method thereof are provided. This hot-... | 05/24/2005 |
| 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 |
| 6863749 | Method of improving the toughness of low-carbon, high-strength steels A method of post-solidification processing to minimize the content of extremely coarse grain-refining precipitates that may form during solidification is low-alloy and alloy high-strength steels containing approximately 0.09-0.17% by weight C so as to provide improv... | 03/08/2005 |
| 6837948 | Process of production of compressor shoe A process of production of a compressor shoe superior in durability and reduced in manufacturing cost, wherein a process of quenching the shoe is performed in a vacuum, inert gas, or modified gas so as to prevent oxidation of the chrome and manganese of the surface ... | 01/04/2005 |
| 6827797 | Process for making triple-phase nano-composite steels Carbon steels of high performance are disclosed that contain a three-phase microstructure consisting of grains of ferrite fused with grains that contain dislocated lath structures in which laths of martensite alternate with thin films of austenite. The microstructur... | 12/07/2004 |
| 6764560 | Method of forming cast alloys having high strength and plasticity The present invention provides cast high-carbon steel having high strength and plasticity and a method for its formation. In the method, forming during cooling from the melting point through temperature control results in a structure having small size cementite grai... | 07/20/2004 |
| 6755920 | Low-alloy heat-resistant steel, heat treatment method therefor, and turbine rotor comprising the same A low-alloy heat-resistant steel may be used to manufacturing a large element which has uniform superior high temperature properties through a surface layer to a center part. The low-alloy heat-resistant steel comprises carbon in an amount of 0.20 to 0.35% by weight... | 06/29/2004 |
| 6723188 | Steel workpiece oil quenching method A steel workpiece maintained at a specified quenching temperature is rapidly cooled to a temperature just above the martensite transformation start point (Ms point) by being immersed in a high-temperature quenching oil. Thereafter, the steel workpiece is taken out o... | 04/20/2004 |
| 6689234 | Method of producing metallic materials The invention includes a method of producing a hard metallic material by forming a mixture containing at least 55% iron and at least one of B, C, Si and P. The mixture is formed into an alloy and cooled to form a metallic material having a hardness greate... | 02/10/2004 |
| 6689227 | Eco-friendly starch quenchants This invention relates to application of eco-friendly starch solution as a quenching medium for heated metal parts fabricated from steel, alloy steel, aluminum and aluminum alloys. Depending on the material grade, critical temperature and desired cooling ... | 02/10/2004 |
| 6648997 | Quenching method Objects formed of engineering and tool steels are quenched from above 850° C. by immersion in an aqueous suspension of inorganic particles. The greater the proportion of particles, the slower the quench. The suspension may be saturated with carbon dioxid... | 11/18/2003 |
| 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 |
| 6554926 | Quenching heated metallic objects A method for quenching a heated metallic object includes discharging a plurality of discrete gas streams from a plurality of nozzle outlets so that the gas streams impinge substantially uniformly over the outer surface of the object, the distance between ... | 04/29/2003 |
| 6471798 | Method and apparatus for heat treating steel A method for heat-treating steel, which method uses a coolant having a large coefficient of heat transfer and which method treats the steel at low cost and in an environment-friendly manner (no pollution), and an apparatus for the method. The heat-treatme... | 10/29/2002 |
| 6451137 | Method of quenching after a low-pressure carburization A method for quenching steel parts having undergone a low-pressure thermal processing, which consists of submitting the parts to a high-pressure air flow.... | 09/17/2002 |
| 6387195 | Rapid quench of large selection precipitation hardenable alloys Large sections of solution annealed, precipitation hardenable alloys which are resistant to internal cracking yet fully hardenable can be produced if, during rapid quenching, the temperature of the section is allowed to stabilize immediately above the all... | 05/14/2002 |
| 6383297 | Method and device for joint oxydation and heat treatment of workpieces Disclosed is a method for joint oxydation and heat treatment of workpieces at temperatures ࣘ1300° in the treatment chamber of an oven containing a neutral or reactive gas in a temperature range above 570°. In order for the process to be reproducible a... | 05/07/2002 |
| 6364974 | Quenching apparatus and method for hardening steel parts A quenching apparatus and a method for hardening steel parts is disclosed. The method optimizes cooling conditions preventing the occurrence of film boiling and the "self-regulated thermal process" while optimizing the depth of the hardened layer and prov... | 04/02/2002 |
| 6280685 | Tool steel composition The invention relates to a tool steel composition comprising, expressed in weight percentage: C 0.3%-0.4% Cr 2.0%-4.0% Mo 0.8%-3.0% V 0.4%-1.0% W 1.5%-3.0% Co 1.0%-5.0% Si 0 %-1.0% Mn 0 %-1.0% Ni 0 %-1.0% the balance being mainly constituted by iron and inevitable ... | 08/28/2001 |
| 6273968 | Low-carbon steels of superior mechanical and corrosion properties and process of making thereof Alloy steels that combine high strength and toughness with high corrosion resistance are achieved by a dislocated lath microstructure, in which dislocated martensite laths that are substantially free of twinning alternate with thin films of retained auste... | 08/14/2001 |
| 6206983 | Medium carbon steels and low alloy steels with enhanced machinability The invention relates to medium carbon steels and low alloy steels having a concentration of a machinability enhancing agent ("MEA"), i.e. tin and/or antimony, at its ferrite grain boundaries which enhances the steel's machinability and to processes for p... | 03/27/2001 |
| 6203634 | Method for heat-treating steel or cast iron components A method for heat-treating a component of steel or cast iron, particularly a through hardening bearing steel component, involves heating the component to the austenitization temperature and holding the component at the austenitization temperature to achie... | 03/20/2001 |
| 6200395 | Free-machining steels containing tin antimony and/or arsenic The invention relates to free-machining steels which do not rely on lead as a means of enhancing machinability. Instead, the steels of the invention employ concentrations of tin, arsenic, and/or antimony at ferrite grain boundaries to replicate a role of ... | 03/13/2001 |
| 6132534 | Liquid quenching apparatus and method The liquid quenching system includes a method and apparatus for heat treating small parts discharged from a furnace. The apparatus includes a bearing and bearing support that provide cantilevered support to a rotary quenching drum. A rotatable joint that ... | 10/17/2000 |
| 6099666 | Variable cooling rate quench method and apparatus A variable rate quench system allows the cooling of a heated workpiece to be controlled more closely. A liquid quenchant used in the system has an initial temperature, density and heat extraction index. The system comprises a first tank containing the liq... | 08/08/2000 |
| 6060180 | Alloy having high corrosion resistance in environment of high corrosiveness, steel pipe of the same alloy and method of manufacturing the same steel pipe The present invention provides a highly corrosion-resistant alloy used as a boiler tube in equipment the energy source of which is obtained by burning fossil fuel or waste, a steel tube for which the alloy is used, and a process for producing the steel tu... | 05/09/2000 |
| 6059903 | Method of cooling sectional girders A method of cooling section steel, particularly sectional steel girders, from rolling heat, wherein, prior to a final air cooling, a water cooling process is carried out in such a way that section steel portions with material concentrations are cooled at ... | 05/09/2000 |
| 6017641 | Coil spring resistive to delayed fracture and manufacturing method of the same A coil spring made of an oil-tempered steel wire with internal hardness of more than Hv 550 in cross-section, the surface hardness of the oil-tempered steel wire being determined in an extent between Hv 420 in a minimum value and hardness defined by subtr... | 01/25/2000 |
| 5961747 | Tin-bearing free-machining steel The invention relates to free-machining steels which do not rely on lead as a means of enhancing machinability. Instead, the steels of the invention employ concentrations of tin at ferrite grain boundaries to replicate a role of lead, which the inventors ... | 10/05/1999 |
| 5930579 | Method for manufacturing reduced iron briquettes A method for manufacturing reduced iron briquettes, wherein reduced iron obtained by a direct reduction method is made into briquettes using a briquette machine, and whereafter the hot briquettes are subject to gradual cooling at a cooling rate in the ran... | 07/27/1999 |
