| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 148225000 | Iron(Fe) or iron base alloy | 52 |
| 20090084470 | REDUCED-PRESSURE HEAT TREATMENT JIG AND REDUCED-PRESSURE HEAT TREATMENT METHOD - A reduced-pressure heat treatment jig is used for supporting a workpiece of iron when the workpiece is subjected to heat treatment in a reduced-pressure atmosphere in which pressure is reduced compared to atmospheric pressure. The jig is formed of an iron material and is formed with a film on at least a contact surface with the workpiece, the film being formed of a material which persists during the heat treatment. The film preferably includes a metal oxide having an evaporating temperature higher than the heat treatment temperature in the reduced-pressure atmosphere. The film preferably contains aluminum oxide. | 04-02-2009 |
| 20100012228 | IRON-BASED COMPOSITE MATERIAL AND METHOD OF MANUFACTURING IRON-BASED COMPOSITE MATERIAL - To provide an iron-based composite material which has higher abrasion and seizure resistance, and more excellent impact absorbing property as compared with a steel material, and which has higher mechanical strength as compared with a cast iron material, and also a method of manufacturing the iron-based composite material. The iron-based composite material includes at least a steel structure layer | 01-21-2010 |
| 20100116377 | HYBRID CARBURIZATION WITH INTERMEDIATE RAPID QUENCH - A carbon hardened surface is produced in a metal workpiece without forming carbide precipitates by carburizing the workpiece at high temperature carburization conditions, rapidly quenching the workpiece, and then carburizing the workpiece under low temperature carburization conditions. | 05-13-2010 |
| 20130263972 | HIGH-CARBON CHROMIUM BEARING STEEL AND PRODUCTION METHOD OF THE SAME - Provided is a production method including: heating a workpiece at a temperature higher than an A | 10-10-2013 |
| 148226000 | With working, machining, or cutting | 16 |
| 20090145523 | Method for manufacturing heat resisting member applicable to an exhaust gas guide assembly with improved heat resistance for VGS turbocharger - An exhaust gas guide assembly with an improved high-temperature wear resistance, oxidation resistance, high-temperature strength or the like for a VGS turbocharger is provided. According to the invention, the exhaust gas guide assembly for a VGS turbocharger includes adjustable blades, a turbine frame and an adjusting mechanism is characterized in that a heat resisting member constitutes the exhaust gas guide assembly to remarkably enhance high-temperature durability or the like of the exhaust gas guide assembly. | 06-11-2009 |
| 20090194203 | METHOD OF MANUFACTURING A BLADE WITH HIGH HARDNESS NITRIDE LAYER - A blade made of a carbon steel or alloy steel is subjected to a surface nitriding process to form a high hardness nitride layer having a thickness in the range of 10 μm to 100 μm and a Vickers hardness Hv of 1000 or more, and a silver oxide layer, a copper oxide layer, or a silver oxide and copper oxide layer is formed on the high hardness nitride layer of the blade by firing. Through this processing, the blade that has a high cutting maintaining ability and an excellent sanitization ability such as antibiosis, sterilization ability, and antimold ability is provided. | 08-06-2009 |
| 20090199930 | SECONDARY-HARDENING GEAR STEEL - A case hardened gear steel having enhanced core fracture toughness includes by weight percent about 16.3Co, 7.5Ni, 3.5Cr, 1.75Mo, 0.2W, 0.11C, 0.03Ti, and 0.02V and the balance Fe, characterized as a predominantly lath martensitic microstructure essentially free of topologically close-packed (TCP) phases and carburized to include fine M | 08-13-2009 |
| 20110000584 | Process for Forming Steel - The invention refers to a process for forming a steel component, incorporating the steps of—providing a blank having substantially the volume of the component to be formed,—heating the blank to a semi solid state with a specific liquid fraction,—forming the blank with a forging technique to a component of near net shape dimensions,—subjecting the formed, near net shape component, to a normalization combined with a hardening,—subjecting the normalized and hardened near net shape component to machining to give the component net shape. | 01-06-2011 |
| 20110108164 | THERMAL MECHANICAL PROCESSING OF STAINLESS STEEL - One embodiment of the present invention is a unique method for thermal mechanical processing of a martensitic stainless steel. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for thermal mechanical processing of a martensitic stainless steel and forged objects resulting therefrom. Further embodiments, forms, features, aspects, benefits, and advantages of the present application shall become apparent from the description and figures provided herewith. | 05-12-2011 |
| 20130008566 | SPRING AND METHOD FOR PRODUCING SAME - A spring consists of, by weight %, 0.27 to 0.48% of C, 0.01 to 2.2% of Si, 0.30 to 1.0% of Mn, not more than 0.035% of P, not more than 0.035% of S, and the balance of Fe and inevitable impurities. The spring has a nitrogen compound layer and a carbon compound layer at the surface at a total thickness of not more than 2 μm. The spring has a center portion with hardness of 500 to 700 HV in a cross section and has a compressive residual stress layer at a surface layer. The compressive residual stress layer has a thickness of 0.30 mm to D/4, in which D (mm) is a circle-equivalent diameter of the cross section, and has maximum compressive residual stress of 1400 to 2000 MPa. | 01-10-2013 |
| 20130068349 | HIGH-STRENGTH TRANSMISSION GEAR AND METHOD OF MANUFACTURING THE SAME - Disclosed herein is a high-strength transmission gear, manufactured by gas-nitriding a nitriding steel having a composition including iron (Fe) as a main component, 0.25˜0.40 wt % of carbon (C), 0.50˜1.0 wt % of manganese (Mn), 2.0˜3.0 wt % of chromium (Cr), 0.3˜1.0 wt % of molybdenum (Mo), 0.2˜0.7 wt % of copper (Cu), 0.03˜0.1 wt % of niobium (Nb), 0.03˜0.1 wt % of aluminum (Al), 0.05˜0.15 wt % of vanadium (V), 0.001˜0.005 wt % of boron (B) and other inevitable impurities. More specifically, while gas-nitriding of the nitriding steel, the temperature is increased in steps, and the ratio of nitrogen gas in the nitriding steel is decreased in steps. | 03-21-2013 |
| 20130213527 | HIGH-STRENGTH TRANSMISSION GEAR AND METHOD OF MANUFACTURING THE SAME - Disclosed herein is a high-strength transmission gear, manufactured by gas-nitriding a nitriding steel having a composition including iron (Fe) as a main component, 0.25˜0.40 wt % of carbon (C), 0.50˜1.0 wt % of manganese (Mn), 2.0˜3.0 wt % of chromium (Cr), 0.3˜1.0 wt % of molybdenum (Mo), 0.2˜0.7 wt % of copper (Cu), 0.03˜0.1 wt % of niobium (Nb), 0.03˜0.1 wt % of aluminum (Al), 0.05˜0.15 wt % of vanadium (V), 0.001˜0.005 wt % of boron (B) and other inevitable impurities. More specifically, while gas-nitriding of the nitriding steel, the temperature is increased in steps, and the ratio of nitrogen gas in the nitriding steel is decreased in steps. | 08-22-2013 |
| 20130306194 | Manufacturing Process for Aerospace Bearing Rolling Elements - A method of treating bearing rolling elements or bearing rings after a hardening and temper heat treatment is disclosed. The method may include treating the bearing rolling elements in a tumbling treatment and then in a duplex hardening treatment. The method may include treating the bearing rings in a peening treatment and then in a duplex hardening treatment. The duplex hardening treatment may also include at least one sequential process segment consisting of subjecting the bearing rolling element & rings to a nitriding process to increase the surface hardness and compressive residual stress. The combined two-step process produces a deep surface/sub-surface residual stress greater than the depth of the maximum operating von-Mises shear stress along with an ultra-hard surface with high magnitude of compressive residual stress. In so doing, the bearing ring and rolling elements will have significantly enhanced rolling contact fatigue resistance and resistance to surface imperfections and debris. | 11-21-2013 |
| 20140230966 | Method for Producing a Grain-Oriented Electrical Steel Strip or Sheet Intended for Electrotechnical Applications - A method for producing a grain-oriented electrical steel strip or sheet, in which the slab temperature of a thin slab consisting of a steel having (% wt.) Si: 2-6.5%, C: 0.02-0.15%, S: 0.01-0.1%, Cu: 0.1-0.5%, wherein the Cu to S content ratio is % Cu/% S>4, Mn: up to 0.1%, wherein the Mn to S content ratio is % Mn/% S<2.5, and optional contents of N, Al, Ni, Cr, Mo, Sn, V, Nb, is homogenised to 1000-1200° C. The thin slab is hot rolled into a hot strip having a thickness of 0.5-4.0 mm at an initial hot-rolling temperature of <=1030° C. and a final hot-rolling temperature of >=710° C., with a thickness reduction in the first and in the second hot-forming passes of >=40%. The hot strip is cooled, coiled, and cold rolled into a cold strip having a final thickness of 0.15-0.50 mm. An annealing separator is applied onto the annealed cold strip to form a Goss texture. | 08-21-2014 |
| 20140283954 | BAINITIC MICROALLOY STEEL WITH ENHANCED NITRIDING CHARACTERISTICS - A forged, microalloyed, and nitrided steel part is disclosed to have a composition including 0.20-0.40 wt. % C, 0.50-1.60 wt. % Mn, 0.40-1.50 wt. % Cr, 0.07-0.30 wt. % Al, 0.03-0.20 wt. % V, 0.10-0.40 wt. % Si, and a balance of Fe and incidental impurities. The part may be produced by heating the steel part to austenization temperature of approximately 1100 degrees C. to 1260 degrees C., hot forging the steel part, controlled air cooling the steel part after hot forging at a rate falling approximately in the range from 1 degree C. per second to 5 degrees C. per second as the steel part cools from approximately 900 degrees C. to approximately 500 degrees C. to produce a predominantly bainitic microstructure of greater than approximately 50% bainite. The steel part may then be machined to a desired configuration, and nitrided by heating in an atmosphere containing ammonia. | 09-25-2014 |
| 20140299234 | CARBURIZED PART, METHOD FOR MANUFACTURING THEREOF, AND STEEL FOR CARBURIZED PART - The invention provides a carburized part which has excellent medium-cycle fatigue strength in particular subjected to surface-hardening treatment by carburization. The invention provides a carburized part including a carburized layer formed by performing carburizing treatment to a steel, the steel including, in terms of % by mass: 0.15% to 0.25% of C, 0.15% or less of Si, 0.4% to 1.1% of Mn, 0.8% to 1.4% of Cr, 0.25% to 0.55% of Mo, 0.015% or less of P, and 0.035% or less of S, with the remainder being Fe and unavoidable impurities, and the steel satisfying the following relation; 0.10≦[Mo]/(10[Si]+[Mn]+[Cr])≦0.40, in which [M] represents a content of element M in terms of % by mass. | 10-09-2014 |
| 20150047748 | METHOD OF IMPROVEMENT OF MECHANICAL PROPERTIES OF PRODUCTS MADE OF METALS AND ALLOYS - The invention pertains to the domain of metallurgy in particular, thermochemical surface treatment of products made of metals, mainly steels, and their alloys and it can be used for products hardening for the purpose of their service durability increase. | 02-19-2015 |
| 20150053310 | METHOD FOR WELDING A CASE HARDENED COMPONENT - A method for producing a welded part from two components, where at least one of the components has a hardened surface. The method can include case hardening the surface of one of the components using a salt bath nitriding process and then welding the case hardened first component to the second component by gas metal arc welding (GMAW). | 02-26-2015 |
| 20160145705 | WEAR-RESISTANT, PARTIALLY UNCOATED STEEL PARTS AND METHODS OF PRODUCING SAME - A wear-resistant steel part may be formed by hot forming and/or hardening a hardenable steel grade semifinished part. The steel part may be used, for example, as a processing, conveying, and/or crushing mechanism in agricultural machines, conveying machines, mining machines, or building machines. The semifinished part may be heated to a temperature above an Ac1 transformation temperature and then subsequently hot formed and/or hardened. The steel part may be particularly suitable for use with abrasive materials. To that end, the steel part may have at least one region that has been hardened to a depth of not more than 100 microns by surface hardening before the semifinished part is hot formed or hardened.” | 05-26-2016 |
| 20170233844 | STAINLESS STEEL SPRING AND STAINLESS STEEL SPRING MANUFACTURING METHOD | 08-17-2017 |
| 148227000 | Utilizing fused agent or media | 1 |
| 148228000 | Nitriding | 1 |
| 20130327445 | MOLTEN-SALT BATH FOR NITRIDING MECHANICAL PARTS MADE OF STEEL, AND IMPLEMENTATION METHOD - A molten-salt bath for nitriding mechanical steel parts, essentially consisting of the following (the contents being expressed in wt %): 25 to 60 wt % of alkali-metal chlorides; 10 to 40 wt % of alkali-metal carbonates; 20 to 50 wt % of alkali-metal cyanates; and a maximum of 3 wt % of cyanide ions (formed during the use of the bath), wherein the total of the contents is 100 wt %. Preferably, the bath contains: 25 to 30 wt % of sodium cyanate; 25 to 30 wt % of sodium carbonate and lithium carbonate; 40 to 50 wt % of potassium chlorides; and a maximum of 3 wt % of cyanide ions (formed during the use of the bath), the total of the contents being 100 wt %. | 12-12-2013 |
| 148230000 | Nitriding | 18 |
| 20080216923 | WEAR-RESISTANT ELEMENTS AND METHOD OF MAKING SAME - A material is shaped and sintered into a compact using iron-based alloy powder containing Cr; and a nitriding treatment having no carburizing action is conducted to the compact so that a surface of the compact may have a mixed structure | 09-11-2008 |
| 20090065098 | HIGH-STRENGTH STEEL EXCELLENT IN WELDABILITY AND PROCESS FOR PRODUCTION THEREOF - The present invention provides a high-strength steel material capable of suppressing formation of blowholes during welding even if the strength thereof is improved by nitriding, and a method of manufacturing such a high-strength steel material by using a low rolling force. A high-strength steel of the present invention contains 0.05% (percent by mass unless otherwise specified in describing chemical composition) or below C, 1% or below Si, 1.5% or below Mn, 0.05% or below P, 0.05% or below S, 0.05% or below Al, 0.02 to 0.3% Ti, and 0.020% or below N. The high-strength steel material has metallographic structure of a single phase of ferrite and contains Ti nitride grains having a maximum size of 20 nm or below and coherently precipitated in a density of 250 grains/μm | 03-12-2009 |
| 20100154938 | Layered fe-based alloy and process for production thereof - The surface of a pre-molded article made of SKH51 (Fe-based alloy) is coated with a powder of Al, Cr and the like. The coating may be performed by applying a coating agent which is prepared by dispersing the powder in an organic solvent. The coating agent may contain a reducing agent. After coating, the pre-molded article is subjected to heat treatment to form a carbonized product of the metal. The pre-molded article may be further treated with nitrogen, thereby forming a layered Fe-based alloy which has a diffusion layer which is formed by the diffusion of the carbonized product, a nitrided product and AIN in the base material. Subsequently, the article may be subjected to finishing process to give a punch having a predetermined shape for use in a hot-roll forging process. | 06-24-2010 |
| 20100193080 | Method for Making Strain Aging Resistant Steel - A method for making a strain aging resistant steel comprises adding boron to the steel, wherein substantially all of the boron in the steel forms boron nitride. A method for making steel comprises adding a nitride-forming element to the steel to lower the free nitrogen content of the steel to a free nitrogen content specification. A high-carbon steel contains boron nitride, wherein the free nitrogen content of the steel is less than 80 ppm. A strain aging resistant steel wherein the carbon content of the steel is between about 0.54 percent and about 0.75 percent. | 08-05-2010 |
| 20120241050 | NITRIDING PROCESS FOR MARAGING STEEL - A nitriding process for a maraging steel is provided in order to increase the compressive residual stress of the maraging steel. A workpiece is made of maraging steel in which titanium is solid solved, and a partial amount of the titanium is oxidized at the surface of the workpiece so that titanium oxide is positively generated and concentrated at the surface. Then a reducing treatment is sufficiently performed as a pretreatment of a nitriding step, thereby removing oxygen. As a result, surface concentration of the titanium in an activated state is increased. Next, by performing the nitriding treatment, the reduced titanium and the solid solved titanium combine with nitrogen as titanium nitride. The titanium is in the activated state and is thereby easily nitrided. Moreover, the surface concentration of the titanium in the activated state is high, whereby a large amount of nitrogen infiltrates into the workpiece. | 09-27-2012 |
| 20120298262 | HIGH STRENGTH STEEL AND HIGH STRENGTH BOLT EXCELLENT IN DELAYED FRACTURE RESISTANCE AND METHODS OF PRODUCTION OF SAME - A steel which is excellent in delayed fracture resistance containing, by mass %, C: 0.10 to 0.55%, Si: 0.01 to 3%, and Mn: 0.1 to 2%, further containing one or more of Cr: 0.05 to 1.5%, V: 0.05 to 0.2%, Mo: 0.05 to 0.4%, Nb: 0.001 to 0.05%, Cu: 0.01 to 4%, Ni: 0.01 to 4%, and B: 0.0001 to 0.005%, and having a balance of Fe and unavoidable impurities, the structure being a mainly tempered martensite structure, the surface of the steel being formed with (a) a nitrided layer having a certain thickness range and a nitrogen concentration higher than the nitrogen concentration of the steel by 0.02 mass % or more and (b) a low carbon region having a certain depth range from the surface of the steel and having a carbon concentration of 0.9 time or less the carbon concentration of the steel. | 11-29-2012 |
| 20120305139 | PROCESS FOR COATING STEEL STRIPS AND COATED STEEL STRIP - In a method for coating steel strips having a base material composition (in weight-%) of: C 0.04-1.0; Mn 9.0-30.0; Al 0.05-15.0; Si 0.05-6.0; Cr≦6.5; Cu≦4; Ti+Zr≦0.7; Nb+V≦0.5, remainder iron including unavoidable steel-incidental elements, the steel strip undergoes annealing and subsequently is coated electrolytically with a coat formed from zinc or a zinc-containing alloy. During the course of annealing of the steel strip at temperatures between 800 and 1000° C. under a N2-H2 containing atmosphere, a surface-near zone is formed which is enriched with nitrides through reaction with elements contained in the steel, thereby preventing molten zinc from penetrating into the base material during welding of the coated steel strip. | 12-06-2012 |
| 20120325373 | METHOD FOR TREATMENT OF METAL SURFACE, AND SURFACE-MODIFIED METAL PRODUCT - Provided is a method of treating a metal surface, which can improve surface properties of a target metal, such as surface hardness and wear resistance in a simple manner and at low cost using very simple equipment alone, and which can prevent the deterioration of the metal to create high added value. The present invention is comprised of a method of treating a metal surface, characterized in that: heat-treating a target metal ( | 12-27-2012 |
| 20130299047 | SURFACE TREATMENT OF METAL OBJECTS - A process for forming an outer diffusion surface layer on a metal substrate or member includes in a first activation stage of an inert particulate refractory material and a metal based material including metals and metal halides. An inert gas and hydrogen halide gas is introduced into the inert particulate refractory material and the metal based material to activate an outer surface of the metal based material. The metal substrate is pretreated to form a diffusion zone extending inwardly from the outer surface of the metal substrate having nitrogen forming an inner diffusion zone and an outer compound or white layer of an iron nitride, an iron carbide or an iron carbonitride compound without an oxide layer. A subsequent diffusion stage treats the metal substrate in an inert gas, in the absence of hydrogen halide gas to form the diffusion surface layer on the metal substrate. | 11-14-2013 |
| 20130333808 | NITRIDED STEEL MEMBER AND MANUFACTURING METHOD THEREOF - The present invention provides a nitrided steel member and manufacturing method thereof. the nitrided steel member including: an iron nitride compound layer formed on a surface of a steel member made of carbon steel for machine structural use or alloy steel for machine structural use, in which with regard to X-ray diffraction peak intensity IFe | 12-19-2013 |
| 20140048181 | Flat Steel Product and Method for Producing a Flat Steel Product - A flat steel product, intended to be formed into a component by hot press forming and having a base made of steel, onto which a metal anti-corrosion coating of a Zn or a Zn alloy is applied. A separate finishing coat is applied to at least one of the free surfaces of the flat steel product. The finishing coat includes at least one base metal compound (oxide, nitride, sulphide, sulphate, carbide, carbonate, fluoride, hydrate, hydroxide, or phosphate). Also, a method enabling the production of a flat steel product of this kind. | 02-20-2014 |
| 20140182747 | Thermo-mechanical Process for Martensitic Bearing Steels - A method for treating a steel bearing component includes subjecting the steel bearing component to a scouring treatment to impart compressive residual stress to a surface region thereof and subsequently nitriding the steel bearing component | 07-03-2014 |
| 20140283955 | METHOD FOR MANUFACTURING FERRITIC STAINLESS STEEL PRODUCT - In a method for manufacturing a ferritic stainless steel product, a ferritic stainless steel object is heated in an inert gas atmosphere including nitrogen gas in a heating furnace at a nitriding temperature higher than or equal to a transformation temperature so as to form a nitrided layer on a surface of the ferritic stainless steel object. Moreover, the nitriding temperature is set lower than 1100° C. during the heating. The heating of the ferritic stainless steel object is performed in a state where a solid carbon exists inside the heating furnace. | 09-25-2014 |
| 20150053311 | NITRIDED STEEL MEMBER AND MANUFACTURING METHOD THEREOF - A nitrided steel member including an iron nitride compound layer formed on a surface of a steel member having predetermined components, wherein: in X-ray diffraction peak intensity IFe | 02-26-2015 |
| 20160076130 | SURFACE MODIFICATION APPARATUS FOR ALLOY STEEL COMPONENT, SURFACE MODIFICATION METHOD FOR ALLOY STEEL COMPONENT, AND METHOD FOR MANUFACTURING ALLOY STEEL COMPONENT - Provided are a surface modification apparatus for an alloy steel component, a surface modification method for an alloy steel component, and a method for manufacturing an alloy steel component, which can provide a deep and homogeneous hard layer for a steel component with a wide shape or a large amount of such steel components. A surface modification apparatus | 03-17-2016 |
| 20160130692 | Rapid Nitriding Through Nitriding Potential Control - A disclosure is directed to a method for rapidly nitriding steel, the method including: placing the steel in a furnace having an atmosphere comprising partially dissociated ammonia gas; heating the steel to a highest temperature in a range of 400 to 600° C. while holding a nitriding potential below 15 atm | 05-12-2016 |
| 148232000 | With post-nitriding heat or quenching | 2 |
| 20110209798 | GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREOF - Nitriding process of a steel strip is performed. Next, annealing is performed to form a forsterite based glass coating film at a surface of the steel strip. Heating is performed up to 1000° C. or more in a mixed gas atmosphere containing H | 09-01-2011 |
| 20120118435 | Method and Apparatus for Nitriding Metal Articles - A method and apparatus for nitriding of highly-alloyed metal article is disclosed herein. In one embodiment, the method and apparatus uses at least one nitrogen source gas such as nitrogen and/or ammonia in an oxygen-free nitriding gas atmosphere, with small additions of one or more hydrocarbons. In this or other embodiments, the method and apparatus described herein is applicable to metal articles comprising iron, nickel and cobalt based alloys and which tend to form passive oxide films on at least a portion of their surface, heated to and nitrided at a certain temperature without prior surface preparation. The apparatus includes an external gas injector comprising 50-60 Hz AC, high voltage/low-current arc discharge electrodes, activating the nitriding atmosphere stream on its way from source to nitriding furnace. | 05-17-2012 |
| 148233000 | With post-carburizing heating or quenching | 7 |
| 20090308497 | CARBURIZATION HEAT TREATMENT METHOD AND METHOD OF USE - Disclosed is a carburization heat treatment method including carburizing a workpiece at a relatively low temperature within a temperature range of A | 12-17-2009 |
| 20100126632 | MANUFACTURING METHOD FOR HIGH-CONCENTRATION CARBURIZED STEEL - This invention provides a process for producing a high-concentration carburized steel which can realize dispersion of a large amount of fine and spherical carbides without causing lowered service life of a furnace, deformed steel products, and lowered working efficiency. The production process comprises (i) a primary carburization step for carburizing a steel product having a predetermined composition at a primary carburization temperature (T | 05-27-2010 |
| 20120222778 | ROLLING/SLIDING PART AND PRODUCTION METHOD THEREOF - A production method of a rolling/sliding part which includes applying a spherodizing annealing treatment to a steel to render an average particle diameter of the carbide of the surface layer portion in a range of 0.3 to 0.6 μm and a maximum particle diameter thereof 4 μm, to render the surface hardness 62 or more by Rockwell C hardness and to render a solid solution carbon amount in a residual austenite of the surface layer portion in a range of 0.95 to 1.15% by weight. | 09-06-2012 |
| 20120247619 | Carburized steel and its process of manufacture - A carburized steel member is manufactured by specific carburizing, cooling, and quenching steps. The steel member contains: C: 0.1% to 0.4%, Si: 0.35% to 3.0%, Mn: 0.1% to 3.0%, P: 0.03% or less, S: 0.15% or less, Al: 0.05% or less, and N: 0.03% or less, and a content of Cr is less than 0.2%, a content of Mo is 0.1% or less, and remainder is constituted of Fe and unavoidable impurities. A surface layer thereof includes: a first layer having a carbon concentration of 0.60 mass % to 0.85 mass % and including a martensitic structure in which no grain boundary oxide layer caused by Si exists; a second layer having a carbon concentration of 0.1 mass % to 0.4 mass % and including a martensitic structure; and a third layer having a carbon concentration of 0.1 mass % to 0.4 mass % and including no martensitic structure. | 10-04-2012 |
| 20120255653 | METHOD OF PROCESSING STEEL AND STEEL ARTICLE - A method of processing steel includes carburizing a martensitic stainless steel work piece to produce a carburized case by utilizing in combination, (i) a composition of the martensitic stainless steel work piece, (ii) a preselected carbon concentration in the carburized case, and (iii) a preselected grain size of the martensitic stainless steel work piece such that the carburized case predominately forms carbides of composition M | 10-11-2012 |
| 20130220488 | METHOD FOR CARBURIZING STEEL COMPONENTS - A carburizing process for increasing the hardness of a case region of a steel component. In one form the application includes plating the outer surface of a stainless steel component with nickel prior to carburizing. One component includes a stainless steel object having a hardened case substantially free of continuous phase grain boundary carbides. | 08-29-2013 |
| 20160160338 | CARBURIZED ALLOY STEEL HAVING SUPERIOR DURABILITY AND METHOD OF MANUFACTURING THE SAME - A carburized alloy steel including, based on the total weight of the alloy steel, 0.1 to 0.35 wt % of carbon (C), 0.1 to 2 wt % of silicon (Si), 0.1 to 1.5 wt % of manganese (Mn), 3 to 5.5 wt % of chromium (Cr), 0.2 to 0.5 wt % of molybdenum (Mo), more than 0 wt % and 0.07 wt % or less of niobium (Nb), more than 0 wt % and 0.3 wt % or less of vanadium (V), more than 0 wt % and 0.2 wt % or less of titanium (Ti), more than 0 wt % and 0.015 wt % or less of nitrogen (N), 0.002 to 0.005 wt % of boron (B), and a balance of iron (Fe). A method of manufacturing the same is also provided. | 06-09-2016 |
| 148234000 | Utilizing agent containing cyano (CN) radical or halogen (X) radical or metal carbonate | 1 |
| 20160083831 | LOW TEMPERATURE CARBURIZATION UNDER SOFT VACUUM - Low temperature carburization of stainless steel using acetylene as the carburizing specie is carried out under soft vacuum conditions in the presence of hydrogen or other companion gas. As a result, formation of soot and the undesirable thermal oxide film that normally occurs during low temperature carburization is eliminated virtually completely. | 03-24-2016 |
| 148235000 | Utilizing hydrocarbon, oil or oxygenated hydrocarbon (e.g., alcohol, furan, carbohydrate, etc.) | 5 |
| 20090178733 | Carburizing In Hydrocarbon Gas - The invention relates to a method of gas carburizing a metallic article, where at least the surface region of the article consists of an alloy with a chromium content of at least 10 wt %. The carburizing is carried out by means of a gas containing carbon, which gas is heated to a temperature below approximately 5500C. The gas is an un-saturated hydrocarbon gas. | 07-16-2009 |
| 20110030849 | LOW TEMPERATURE CARBURIZATION UNDER SOFT VACUUM - Low temperature carburization of stainless steel using acetylene as the carburizing specie is carried out under soft vacuum conditions in the presence of hydrogen or other companion gas. As a result, formation of soot and the undesirable thermal oxide film that normally occurs during low temperature carburization is eliminated virtually completely. | 02-10-2011 |
| 20110277887 | METHOD FOR CARBURIZING WORKPIECES AND ITS APPLICATION - A method for carburizing workpieces made of steel, particularly workpieces having outer and inner surfaces, the workpiece being held at a temperature in the range of 850 to 1050° C. in an atmosphere containing a gaseous hydrocarbon. At least two different gaseous hydrocarbons are used and/or the workpiece is alternatingly held in the atmosphere containing the gaseous hydrocarbon during a carburizing pulse and in an atmosphere free of hydrocarbon during a diffusion phase. Also described is a use of the method. | 11-17-2011 |
| 20120247620 | LOW-TEMPERATURE STAINLESS STEEL CARBURIZATION METHOD - A low-temperature stainless steel carburization method comprises steps: providing a stainless steel material; placing the stainless steel material in a halogen-free reducing environment and maintaining the stainless steel at a first temperature ranging 1,050 to 1,400° C.; and placing the stainless steel material in a carbon-bearing atmosphere and maintaining the stainless steel material at a second temperature lower than 600° C. to implant carbon atoms into the stainless steel material to form a carburized layer on the surface of the stainless steel material. A halide-bearing gas or solution is not to be applied to activate the passivation layer, so the fabrication cost would be reduced and the safety of carburization process would be enhanced. Besides, the environment can be prevented from halide pollution. | 10-04-2012 |
| 20140366993 | METHOD OF CARBURIZING - A method of carburizing ferrous metal parts that includes the steps of providing a furnace for heating the metal parts and a process chamber, purging the air atmosphere from the process chamber and heating said process chamber to a temperature of at least 1100° F., feeding a gas to the process chamber and a source of air at a constant flow rate to the process chamber, boosting the process chamber by feeding an enriching gas to the process chamber to create a carbon potential of at least 0.5%, and more preferably of at least 1.4%, cleaning the process chamber by decreasing the flow of enriching gas to the process chamber to create a carbon potential of less than about 0.25%, repeating the boosting step after performing said cleaning step, and repeating the cleaning step after performing said boosting step. | 12-18-2014 |
