Class 148/228 - Nitriding

Subclass of Class 148 - Metal treatment
Definition: Process which involves exposing a metal substrate or workpiece
No. of patents: 28
Last issue date: 03/01/2011

Number	Title	Issue Date
7896981	Nitriding stainless steel for consumer electronic products A cost effective system, method and apparatus adapted to provide a nitride layer on stainless steel used for the manufacture of consumer electronic products. In addition to providing a durable, hard surface that is both scratch and impact resistant, the nitride laye...	03/01/2011
7438769	Process for diffusing titanium and nitride into a material having a coating thereon A method for diffusing titanium and nitride into a base material having a coating thereon using conventional surface treatments or coatings. The method generally includes the steps of providing a base material having a coating thereon; providing a salt bath which in...	10/21/2008
7238244	Nitriding of iron and steel parts in salt bath having improved corrosion resistance A new nitriding process by using a salt bath to produce iron and steel parts having excellent abrasion resistance and corrosion resistance includes forming an iron lithium complex oxide layer at the outermost surface of the iron part by immersing the iron and steel ...	07/03/2007
7217327	Method of producing metal member with enhanced corrosion resistance by salt bath nitriding A metal member is produced with enhanced corrosion resistance by salt bath nitriding. Specifically, in a nitriding salt bath containing Li+, Na+ and K+ ions as cation components and CNO− and CO3−−	05/15/2007
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
6790294	Spring with excellent fatigue endurance property and surface treatment method for producing the spring Hard metal particles having hardness which is lower than the hardness of a nitrided outermost layer of a spring and in the range of Hv 500 to 800 and a diameter of 500 to 900 μm are protected against the nitrided surface of the spring at a velocity of 40 to 90 m/se...	09/14/2004
6746546	Low temperature nitriding salt and method of use A composition for nitrocarburizing stainless steel parts and a method for producing a nitride or hard case on such parts using the composition, are provided. The composition includes alkali metal cyanate and alkali metal carbonate, wherein the cyanate ion is present...	06/08/2004
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
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
6348110	Methods of manufacturing rotary drill bits A rotary drill bit is manufactured by a method including the step of forming at least a portion of the bit body from a precipitation hardening alloy, and brazing cutters to the bit body by a heating and cooling cycle during which the bit body is first hea...	02/19/2002
6179932	Motor rotary shaft and manufacturing method thereof A motor rotary shaft according to the present invention is constructed only at the surface layer of a journal portion with a hard nitride layer, so that the resultant motor rotary shaft is available at a low cost, not so heavy and excellent in durability ...	01/30/2001
6093263	Soft nitrided gear and method of fabricating the same A gear having high pitching resistance, sufficient surface hardness, sufficient hardened depth, high abrasion resistance, high breakage resistance, high fatigue resistance, and low gear noises. A material equivalent to JIS-SCM420 is soft nitrided for two ...	07/25/2000
5948177	Collet metal treating process A method of surface treating a metallic machine tool element includes heating the element prior to insertion of the metal element into a nitrating salt bath for the purpose of both hardening the element and improving the resilience of portions required to...	09/07/1999
5810947	Method of surface modification for tool steels The adhesive strength and hardness of chromium nitride(CrN) film deposited on SKD 61 tool steel was significantly enhanced by a nitriding process on the surface the tool steel before coating with a CrN film. These nitriding processes included nitrocarburi...	09/22/1998
5772795	High strength deep drawing steel developed by reaction with ammonia A method of producing high strength steel sheet and formed articles fabricated from the sheet and containing about 0.01-0.3 free and uncombined atomic percent Ti, Nb or V as strengthening element, by hot rolling or hot rolling plus cold rolling the sheet ...	06/30/1998
5650022	Method of nitriding steel A method of nitriding steel which comprises reacting the steel surface with nitrogen so as to form a hard nitrided layer, and, prior to nitriding, holding steel under a gas atmosphere containing fluorine compound gas or fluorine gas and also containing ai...	07/22/1997
5240514	Method of ion nitriding steel workpieces In subjecting a steel workpiece to nitriding by glow discharge, formation of brittle nitrogen compound is restrained and the surface hardened layer with a nitrogen diffusion layer of high toughness is obtained by making the gas atmospheric condition the g...	08/31/1993
5176760	Steel article and method A hard wear-resistant and corrosion- and oxidation-resistant stainless steel article is made by precision machining a work piece of approximately the size and shape of the desired article, then subjecting the resulting cold worked article to ion bombardme...	01/05/1993
5102476	Process for nitrocarburizing components made from steel Components made from steel can be nitrocarburized in cyanate- and cyanide-containing salt baths within relatively short times if the process is carried out at 600° to 700° C. in a first stage and at 560° to 590° C. in a second stage. The components ex...	04/07/1992
4582679	Titanium nitride dispersion strengthened alloys To increase the creep strength of a titanium-containing alloy which also contains chromium, the alloy powder is heated in the presence of ammonia at a temperature of the order of 700° C. so as to form a layer of chromium nitride(s) on the particles and i...	04/15/1986
4495003	Manufacturing a steel tube including tufftriding A steel tube having a small outside diameter and a large wall thickness, for use, for example, as a high pressure fuel injection pipe for a diesel engine, has a hardened layer on at least its internal surface. The hardened layer is formed by a diffusion l...	01/22/1985
4492604	Salt bath for nitriding iron materials Low cyanide nitriding salt baths which are composed of alkali cyanate and alkali carbonate and used for treating components made of steel and iron produce coatings on the surface of the component in some cases and can lead to problems in the use of the co...	01/08/1985
4332653	Method of nitriding by high temperature electrolysis A method of nitriding by high temperature electrolysis in which the works to be nitrided are dipped into a molten cyanide bath which contains low grade oxides of titanium and/or zirconium in a hot dispersed form as catalyst and maintained at a temperature...	06/01/1982
4268323	Process for case hardening steel A process for case hardening steel is described. A fused bath of inert salt is maintained which bath is comprised of alkali or alkali earth halides, and alkali, or alkaline earth oxides or carbonates. To this fused bath is added urea, dicyanodiamide or py...	05/19/1981
4204886	Method for improving and article having improved wear resistance A method of improving resistance of ferrous parts to wear failure such as galling and seizure, and parts having such increased resistance are disclosed. The invention includes a two step process wherein the part is first nitrided to provide a nitride case...	05/27/1980
4184899	Method of surface hardening stainless steel parts A method of surface hardening stainless steel parts for increasing their wear and fatigue resistance comprises (a) subjecting the surface of the stainless steel part to a salt bath containing, by weight, up to 0.5% sulphur, 4-30% of a cyanide, and 10-30% ...	01/22/1980
4019928	Process for nitriding iron and steel in salt baths regenerated with triazine polymers Iron and steel are nitrided in a salt bath in a process favorable to the environment. The salt bath consists essentially of potassium cyanate, sodium cyanate, potassium carbonate, and sodium carbonate. Preferably, air flows through the bath. The bath pref...	04/26/1977

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Class 148/228 - Nitriding