Class 148/232 - With post-nitriding heat or quenching

Subclass of Class 148 - Metal treatment
Definition: Process which includes a post-nitriding heating or sudden
No. of patents: 30
Last issue date: 01/25/2011

Number	Title	Issue Date
7875128	Method for manufacturing a stainless steel product and a stainless steel product manufactured by the method A Ni-free stainless steel product excellent in workability and corrosion resistance and a method for manufacturing such stainless steel product. A ferritic stainless steel product containing 18 to 24% by mass of Cr and 0 to 4% by mass of Mo is brought into contact w...	01/25/2011
7108756	Method for heat-treating work pieces made of temperature-resistant steels A method of producing a workpiece of a heat-resistant steel, such as hot forming tool steel, where the workpiece may be hardened and depassivated after mechanical machining and electrochemical treatment. The hardening including a reduction step, so that no depassiva...	09/19/2006
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
6946038	Steel plate having Tin+MnS precipitates for welded structures, method for manufacturing same and welded structure A weldable structural steel product having fine complex precipitates of TiN and MnS is provided which contains, in terms of percent by weight, 0.03 to 0.17% C, 0.01 to 0.05% Si, 1.0 to 2.5% Mn, 0.05 to 0.2% Ti, 0.0005 to 0.1% Al, 0.008 to 0.030% N, 0.0003 to 0.01% B...	09/20/2005
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
6579384	Ball for constant-velocity joint and method of manufacturing such ball A ball for use in a constant-velocity joint, which is adapted to be interposed between an inner race and an outer race for transmitting rotational power therebetween, is produced by nitriding a surface of a ball made of bearing steel or a material equival...	06/17/2003
6562151	Rolling shaft made by high-frequency quenching In a rolling shaft relatively rolling with respect to rolling members provided in a radial needle roller bearing, the rolling shaft is composed of a steel containing 0.5 to 1.2 wt % carbon and is provided with a surface layer 3a containing 0.05 to 0.4 wt ...	05/13/2003
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
6447619	High surface pressure resistant steel parts and methods of producing same High surface pressure resistant steel parts and their producing methods are disclosed. These steel parts are useful as gears, cams, bearings and similar high-strength compact steel articles which are required to have wear resistance and strength to withst...	09/10/2002
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
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
6325867	Rolling bearing and heat treatment method therefor A rolling bearing contains no more than 0.3 wt % of nitrogen in a grinding allowance portion after carbonitriding and hardening heat treatments, contains from 0.9 wt % (inclusive) up to 1.6 wt % (inclusive) of carbon and from 0.05 wt % (inclusive) up to 0...	12/04/2001
6309475	Rolling element and producing method For easily producing a toothed material for high-strength gears etc. with a plastic working technique, deformation resistance occurring in plastic working is reduced and stable high precision plastic working is enabled at lower temperatures. One or more t...	10/30/2001
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
6235128	Carbon and alloy steels thermochemical treatments The present invention is a unique sequential process for treating carbon and alloy steels to improve resistance to tribological stresses while reducing conventional processing time required to obtain articles having a similar hardness. This process compri...	05/22/2001
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
5669988	Corrugating roll and manufacturing method thereof Object: Prevention of generation of press marks as well as increase of wear resistance at a corrugation tip portion and thereby providing a corrugating roll having a much improved life. Construction: A manufacturing method of a corrugating roll useful for ...	09/23/1997
5667605	Method of fabrication of a piece of structural steel, and the steel fabricated thereby The invention relates to a method for fabricating a piece of structural steel that includes thermal or thermomechanical treatment steps that could ordinarily lower the fatigue strength and shock and impact resistance of the steel piece. In the method of t...	09/16/1997
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
5503687	Nitrogen enrichment of surface and near surface regions to produce a high-strength austenitic surface layer in stainless steels Enrichment of surface and near surface regions of stainless steel components that nearly have their final shape with dissolved nitrogen at temperatures between 1000° and 1200° C. is provided. In this way, ferritic and martensitic structure portions in t...	04/02/1996
5298091	Inhibiting coke formation by heat treating in nitrogen atmosphere A method is taught for protecting fuel contacting surfaces of a gas turbine engine from carbon deposition by heating the element in a nitrogen containing atmosphere for sufficient time to cause penetration and absorption of nitrogen into the grain boundar...	03/29/1994
5254181	Method of nitriding steel utilizing fluoriding This invention relates to a method for forming a uniform, deep nitride layer on and in steel works at low cost, wherein a steel work is fluorided in heated condition in an atmosphere of a mixed gas composed of fluorine gas and inert gas and, then, nitride...	10/19/1993
5228929	Thermochemical treatment of machinery components for improved corrosion resistance Disclosed is a process for manufacturing a corrosion resistant iron-alloy, powered metal or sintered carbide component. In a first step, the component is subjected to an initial thermochemical treatment preferably consisting of nitriding, in a closed furn...	07/20/1993
4846899	Nitride dispersion-strengthened steels and method of making A low carbon steel has a composition which is ferritic, martensitic or ferritic: martensitic at temperatures of the order of 700° C. and substantially fully austenitic at temperatures in excess of 1000° C. and nitriding of a refractory stable metal nitr...	07/11/1989
4713122	Production of thin flat articles with hardened surfaces Thin metal articles of pre-determined shape are given a first treatment to provide a hardened surface and a second treatment to correct distortion caused by the hardening treatment. The hardening is provided an epsilon nitride layer and the corrective tre...	12/15/1987
4366008	Method for hardening steel A method of hardening steel so that it may have a surface layer with sufficient hardness to permit fabrication into machinery parts with a minimum of strain developed therein. The method comprises heating steel at a temperature in a range not lower than 1...	12/28/1982
4264380	Nitride casehardening process and the nitrided product thereof A method of nitriding ferrous alloys for improving the quality and integrity of the resultant case or hardened surface portion formed thereby, comprising the application of a specific combination of sequenced temperature and nitrogen conditions....	04/28/1981
4154629	Process of case hardening martensitic stainless steels A process for case hardening martensitic stainless steels comprising the steps of forming non-explosive and neutral or weakly reducing atmosphere consisting essentially of 97.5% to 95% by volume of nitrogen gas, 0.5% to 1.5% by volume of carbon monoxide a...	05/15/1979
3998666	Subscale reaction strengthening of low carbon ferrous metal stock Low carbon, low alloy, ferrous metal stock containing from 0.05 to 0.5 wt. percent uncombined group IVB or VB metal, is strengthened by a procedure comprising; gas phase nitrogenation at temperatures below 590° C to form extremely fine dispersions of suc...	12/21/1976

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Class 148/232 - With post-nitriding heat or quenching