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| Number | Title | Issue Date |
| 8182617 | Nitrogen alloyed stainless steel and process The present invention comprises the nitrogen alloying of stainless steel with a gaseous nitrogen compound such as nitrogen gas (N2), or ammonia (NH3) at high temperature wherein the reaction pressure is lowered. A base powder with properties si... | 05/22/2012 |
| 7431778 | Case-hardening of stainless steel The invention relates to case-hardening of a stainless steel article by means of gas including carbon and/or nitrogen, whereby carbon and/or nitrogen atoms diffuse through the surface into the article. The method includes activating the surface of the article, apply... | 10/07/2008 |
| 7384488 | Method for producing gears and/or shaft components with superior bending fatigue strength and pitting fatigue life from conventional alloy steels A conventional aluminum killed alloy steel for case hardening of gear(s) and/or shaft components consisting of 0.10 to 0.30 weight % Carbon, 0.15 to 0.35 weight % Silicon, 0.8 to 1.5 weight % Chromium, 0.6 to 1.5 weight % Manganese, 0.017 to 0.040 weight % Aluminum,... | 06/10/2008 |
| 7326306 | Method for producing nitriding steel In the present invention, after a nitriding process is performed on a steel, a passivating process in which the steel is heated under an atmosphere containing oxygen is performed. The heating condition of the passivating process is within a range surrounded by (100Â... | 02/05/2008 |
| 7247403 | Surface modified stainless steels for PEM fuel cell bipolar plates A nitridation treated stainless steel article (such as a bipolar plate for a proton exchange membrane fuel cell) having lower interfacial contact electrical resistance and better corrosion resistance than an untreated stainless steel article is disclosed. The treate... | 07/24/2007 |
| 7204005 | Manufacturing method of endless metal belt and manufacturing apparatus of endless metal belt A manufacturing method of an endless metal belt having metal rings built up and differing in circumference, includes the following steps of: a first circumference correction step of expanding each of the metal rings; and a second circumference correction step of exp... | 04/17/2007 |
| 7204892 | Hoop for CVT belt and manufacturing method therefor A hoop for a CVT belt including foreign matter existing in a nitrided hardened layer and surface of the hoop, the foreign matter comprises at least one of an oxide-type foreign matter, a nitride-type foreign matter, and a carbide-type foreign matter. The oxide-type ... | 04/17/2007 |
| 7074282 | Steel wire rod for hard drawn spring, drawn wire rod for hard drawn spring and hard drawn spring, and method for producing hard drawn spring Disclosed is a steel wire rod for hard-drawn springs capable of exhibiting fatigue strength and sag resistance equivalent to or higher than springs made of an oil-tempered wire. The steel wire rod contains carbon in a range from 0.5 to less than 0.7 mass %, silicon ... | 07/11/2006 |
| 6982120 | Hardened steel components and process of treating the same The invention relates to components made of steel, more particularly outer joint parts and inner joint parts of constant velocity joints, and to a process of heat treating such components made of steel. The heat treatment operation includes the process stages of nit... | 01/03/2006 |
| 6966954 | Spall propagation properties of case-hardened M50 and M50NiL bearings A roller bearing that provides ball and roller bearing elements comprised of M50 steel and M50NiL steel having surface hardnesses above 60 HRC, and in the range of 65-72 HRC. The hardness in the surface region is achieved by nitriding the surface to achieve a high h... | 11/22/2005 |
| 6929757 | Oxidation-resistant magnetorheological fluid A magnetorheological fluid containing magnetorheological particles which are resistant to oxidation having regions rich in diffused nitrogen located therein and a method for producing such magnetorheological fluid. ... | 08/16/2005 |
| 6884049 | Screw compressor and method of manufacturing rotor for the same A screw compressor of which a female rotor is driven by a motor, and of which a male rotor is driven by the female rotor. The male or female rotor is composed of a member which is made of cast iron and is subjected to surface hardening treatment or heat treatment in... | 04/26/2005 |
| 6878218 | High strength gear and method of producing the same A high strength gear is provided which comprises a base metal of an iron-base alloy, the base metal being carburized or carbonitrided and having a tooth surface, and a coating containing Fe nitride and/or Fe carbonitride, formed on the tooth surface. A method of for... | 04/12/2005 |
| 6858099 | Steel material production method A method for producing a steel material having a high fatigue strength and given a uniform residual stress by a rapid treatment. A marageing steel is subjected to a cold plastic working to have a predetermined dimension, to a solution treatment for 60 minutes or mor... | 02/22/2005 |
| 6733600 | Nitrided maraging steel and method of manufacture thereof A maraging steel is subjected to the aging to have a hardness of more than 500 Hv. A nitrided case is formed to have a depth that is about 20% to 50% to a ½ thickness of the maraging steel plate. An endless ring for a metal belt is constructed by the above maraging... | 05/11/2004 |
| 6723175 | Formed member made of steel sheet and method for producing same A method for producing a formed member made of a steel sheet according to the present invention is characterized by preparing a steel sheet material having tensile strength of 500 MPa or less and containing a nitriding element; forming a formed member having a prede... | 04/20/2004 |
| 6695930 | Process for case hardened dies in improving die life Steel alloys susceptible to case and core hardening comprise 0.05 to 0.24 wt % carbon; 15 to 28 wt % cobalt and 1.5 to 9.5 wt % in nickel, small percentages of one or more additives: chromium, molybdenum, and vanadium; and the balance iron. Carburized rol... | 02/24/2004 |
| 6679953 | Method for assembling and hardening a ball plug in a counterbore of a fuel injector nozzle assembly According to the method of the present invention, the ball plug is press fit into the counterbored passage of a fuel injector nozzle assembly prior to hardening of the fuel injector nozzle assembly. A core hardening and gas nitriding process is then appli... | 01/20/2004 |
| 6663730 | Maraging steel and process for manufacturing a strip or a part cut out of a strip of cold-rolled maraging steel A maraging steel strip or part and process for manufacture of a strip or of a part cut out of a strip of cold-rolled maraging steel and hardened by a hardening heat treatment. In the process, before the hardening heat treatment is performed, the strip or ... | 12/16/2003 |
| 6663724 | Molten salt composition for use in manufacturing laminated rings A laminated ring for use as a belt in transmitting power in a continuously variable transmission is produced by welding opposite ends of a sheet of maraging steel to produce a plurality of rings, and rolling said rings to a predetermined length. The rings... | 12/16/2003 |
| 6631542 | Method of manufacturing laminated ring and heat treatment apparatus for use in such method A cylindrical drum, which comprises a sheet of maraging steel with welded opposite ends, is severed into a plurality of rings of predetermined width, and the rings are rolled to a predetermined length, after which circumferential lengths of the rings are ... | 10/14/2003 |
| 6589363 | Method for making heat treated stainless hydraulic components A stainless steel hydraulic component and method for making same hard turns a pre-heat treated stainless steel material, preferably a 400 series stainless steel material, provided in bar stock form in a single machining loading. Stainless steel hydraulic ... | 07/08/2003 |
| 6562152 | High strength steel plate having improved workability and plating adhesion and process for producing the same A TRIP-type high strength steel plate having good workability is provided which, while reducing the amount of alloying elements added which increase the production cost, ensures a contemplated retained austenite structure, has good adhesion to zinc platin... | 05/13/2003 |
| 6550122 | Method of manufacturing laminated ring A cylindrical drum is prepared by welding opposite ends of a thin sheet of maraging steel. A first solution treatment is effected on the cylindrical drum, and then the cylindrical drum is severed into a plurality of rings each having a predetermined width... | 04/22/2003 |
| 6458220 | Case hardened steel blades for sports equipment and method of manufacture Steel alloys susceptible to case and core hardening comprise 0.05 to 0.24 weight percent carbon; 15 to 28 weight percent cobalt and 1.5 to 9.5 weight percent in nickel, small percentages of one or more additives: chromium, molybdenum, and vanadium; and th... | 10/01/2002 |
| 6428849 | Method for the co-deposition of silicon and nitrogen on stainless steel surface The invention discloses a method for producing a nitrogen-silicon containing stainless steel layer on a metal. The method includes a pack cementation process involving the use of silicon nitride, silica and sodium fluoride as the source materials.... | 08/06/2002 |
| 6406557 | Process for the treatment of grain oriented silicon steel During the treatment of electrical steel, a careful combination of heat treatment of the slab with a specific primary recrystallization and nitriding treatment allows for control of the distribution, quantity and dimensions of precipitates in order to obt... | 06/18/2002 |
| 6391124 | Non-heat treated, soft-nitrided steel parts A non-heat treated soft-nitrided steel part respective contents of C, Si, Mn, P, Cr, Ti, V, N, Al, Pb, S and Ca of which are in specific ranges and which satisfies the following formulas (1) to (3). This part can be produced in a process of hot working, m... | 05/21/2002 |
| 6361621 | Process for the inhibition control in the production of grain-oriented electrical sheets The production of grain-oriented electrical steel sheets is disclosed wherein grain growth in the steel is inhibited by a method comprising the regulation of the content of sulfur and manganese in the steel strp and the cold rolled strip is continuously n... | 03/26/2002 |
| 6361620 | Process for the inhibition control in the production of grain-oriented electrical sheets In the production of grain-oriented electrical steel strip, the grain growth inhibition is controlled by balancing the copper, aluminum and carbonium content in order to control the type and quantity of precipitated second phases and obtain optimum grain ... | 03/26/2002 |
| 6328818 | Method for treating surface of ferrous material and salt bath furnace used therefor The present invention features nitriding-treating the ferrous material to form a nitrided layer composed of at least one of iron nitride and iron carbide nitride on the surface thereof, and heating to maintain the ferrous material at a temperature of 500 ... | 12/11/2001 |
| 6325866 | Process for the production of grain oriented silicon steel sheet A process for the production of grain oriented silicon steel sheet which provides an optimization of the production of conventional, grain oriented silicon steel strips, by the use of an appropriate synergistic combination of the composition levels of som... | 12/04/2001 |
| 6309474 | Process for producing maraging steel In a method for producing maraging steel, a thin plate of maraging steel is subjected to an aging treatment, is then subjected to a fluoridation processing in which the thin plate is heated and maintained in a fluoric reacting gas including fluorine so as... | 10/30/2001 |
| 6296719 | Process for the production of grain oriented electrical steel strip having high magnetic characteristics, starting from thin slabs In the production of high permeability electrical steel, the control of condition of thin slab continuous casting allows to obtain advantageous solidification structures and precipitates. This, in turn, allows to decritize the process for controlling the ... | 10/02/2001 |
| 6284062 | Member for immersion in hot dip galvanizing bath and method for producing the same A member used in contact with a hot dip galvanizing bath, such as a sinker roll, a support roll or a bearing, is produced by nitriding stainless steel to form a nitride layer and a nitrogen-diffused layer on the surface thereof. The member used in contact... | 09/04/2001 |
| 6273964 | Process for the production of grain oriented electrical steel strip starting from thin slabs In the production of grain oriented electrical steel sheet, controlling the condition of thin slab continuous casting results in advantageous solidification structures and precipitates. The steel has an initial content of carbon less than 300 ppm and an i... | 08/14/2001 |
| 6231807 | Dispersion hardening alloy and method for the production of the alloy A dispersion hardened FeCrAl-alloy and method of its production which includes in one step, forming a nitride dispersion in a FeCr-alloy, whereby this nitride dispersion includes one or more of the basic elements hafnium, titanium and zirconium, and, in a... | 05/15/2001 |
| 6224686 | High-strength valve spring and it's manufacturing method The high-strength valve spring uses, as the material, a steel containing 0.5-0.8% C, 1.2-2.5 wt % Si, 0.4-0.8 wt % Mn, 0.7-1.0 wt % Cr, balance Fe and inevitable impurities, where, in the inevitable impurities, Al is no more than 0.005 wt % and Ti is no m... | 05/01/2001 |
| 6197125 | Modification of diffusion coating grain structure by nitriding A method for improving the corrosion resistance, increasing the hardness, providing superior ductility, and reducing surface-cracking of a diffusion coating by nitriding and heating-treating the diffusion coating is disclosed. The nitriding and heat-treat... | 03/06/2001 |
| 6179933 | Surface treatment of rolling element bearing steel Rolling-element bearing components made from high quality steel are subjected to ion nitriding in a plasma as a final step in the manufacturing process to produce a layer with a hardness around 800-1200 HV with a depth no more than 150 μm. By controlling... | 01/30/2001 |
