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7559995 |
Method for heat treatment of metal workpieces as well as a heat-treated workpiece
A process for heat treating metal workpieces contains with respect to an efficient process control the following successive operations following directly one after the other: a heating phase; an...
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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...
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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...
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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...
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6902631 |
Air-hardening, low to medium carbon steel for improved heat treatment
A steel to be air-hardened as part of heat treatments such as hardening-and-tempering, induction hardening, carburizing, carbonitriding or nitriding comprising, in weight %:
C 0.10-0.55; Si...
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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...
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6800144 |
Process for producing retainer for constant velocity joint possessing improved machinability and flexural strength
Disclosed is a process for producing a retainer for a constant velocity joint for automobiles or the like, which has improved flexural strength properties without sacrificing the machinability,...
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6790295 |
Method of improving sliding surfaces in anti-seizure property
A method of improving wear-resistance and anti-seizing properties of slide surface of machineries, such as outer slide surfaces of piston pins of vehicle engines, wherein slide surfaces of iron or...
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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...
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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,...
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6627005 |
High fatigue-strength steel wire and spring, and processes for producing these
A steel wire of pearlite structure containing 0.8-1.0 mass % of C and 0.8-1.5 mass % of Si is disclosed. In the cross section of the steel wire the average hardness in a region up to 100 μm from...
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6620262 |
Method of manufacturing inner and outer races of deep groove ball bearing in continuous annealing furnace
The continuous annealing furnace has two or more treatment chambers sequentially connected with each other and respectively filled with a gas atmosphere differing in carburizing property, which...
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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...
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6379473 |
Method of manufacturing laminated ring using molten salt composition
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,...
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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 %...
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6312529 |
Steel compositions and methods of processing for producing cold-formed and carburized components with fine-grained microstructures
Steel compositions and processes are described that provide optimum resistance to austenite grain coarsening in cold-formed and carburized components for automotive and machine structural...
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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...
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6294029 |
Method of treating and smoothing sliding surface
A surface treating and smoothing method of surface-treating and smoothing a sliding member including steps of finishing the sliding member by pressurized particle containing fluid blasting to a...
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6153030 |
Method for the manufacture of hollow shafts
A method for the production of hollow shafts from welded or seamlessly produced steel tubes having a maximum carbon content of 0.35% includes (1) carburizing a tube to a carbon content greater than...
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6126897 |
Carburizing steel and steel products manufactured making use of the carburizing steel
A carburizing steel having the following chemical composition: C: 0.1 to 0.25%, Si: 0.2 to 0.4%, Mn: 0.3 to 0.9%, P: 0.02% or less, S: 0.001 to 0.15%, Cr: 0.5 to 0.9%, Mo: 0.15...
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6117249 |
Treating metallic machine parts
A method of treating a metallic machine part to increase wear life and to change surface appearance comprising the steps of roughening the surface, thereafter changing its color by case hardening...
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6110296 |
Thin strip casting of carbon steels
A substantially carbon free (e.g. 50-80 ppm carbon max.) iron base melt is strip cast to provide a cast strip having a low strength, high ductility, essentially ferrite matrix substantially free of...
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6053988 |
Method for making piston rings
A method and apparatus for making a piston ring in which a metal strip having a first coefficient of expansion is coiled about a special mandrel having a second greater coefficient of expansion and...
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6051080 |
Rolling element used for toroidal-type continuously variable transmission and method for producing same
The invention relates to a power roller used for a toroidal-type continuously variable transmission. This power roller has on its first side a groove for receiving a bearing, and the surface of the...
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6027577 |
Manufacturing method of valve spring superior in durability
In a manufacturing method of a valve spring, a coiled valve spring made of an oil-tempered wire is applied with nitriding treatment and is supported to be rotated about its center axis. During a...
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6024346 |
Coil spring resistant to permanent set and fatigue
By controlling the thickness of the nitrization layer formed on the surface, the coil spring made of spring steel may be made highly resistant to permanent set and fatigue. By carbonitriding the...
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5985044 |
Forged, non-heat treated, nitrided steel parts and process of making
Forged, nitrided steel parts having a high fatigue limit and bending toughness are produced without heat treatment for refining between the forging and nitriding. The steel has a composition...
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5916383 |
Method of shot peening a hardened metal product with shot having high hardness
A method for shot peening a hard metal product that has a hardened surface. The method includes projecting shot on the hardened surface of the hard metal product. The ratio of the Vickers hardness...
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5868871 |
Method and apparatus for carburizing, quenching and tempering
Method and apparatus for carburizing, quenching and tempering workpieces, by which the step of carburizing can be incorporated into a machining and manufacturing process to be performed by an...
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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,...
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5759293 |
Decarburization-annealed steel strip as an intermediate material for grain-oriented electrical steel strip
A decarburization-annealed steel strip as an intermediate material for grain-oriented electrical steel strip having good secondary recrystallization and excellent electrical properties is provided...
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5718774 |
Method of producing bevel gear
A method of producing a bevel gear is provided. The method comprises the steps of forging, from a case hardened and heated blank, a rough shaped bevel gear intermediate product having a toothed...
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5707460 |
Method of producing parts having improved wear, fatigue and corrosion resistance from medium alloy, low carbon steel and parts obtained therefrom
Improved corrosion, wear and fatigue resistance is provided for pieces formed of medium alloy, low carbon steel by subjecting the piece to a treatment process which includes a step of carburizing,...
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5683521 |
Method for manufacturing spring having high nitrided properties
A method for forming a spring which can reduce variations in the surface hardness and the thickness of the hardened layer when the spring is nitrided. Before nitriding the spring, the thickness of...
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5665179 |
Process for producing a coil spring
A process for producing a coil spring comprises steps of: cold drawing a wire comprising: C in an amount of 0.55 to 0.75% by weight; Si in an amount of 1.00 to 2.50% by weight; at least two primary...
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5477976 |
Brightening chemical polishing solution for hardened steel article and method of chemically polishing said article in the solution
A brightening chemical polishing solution for a hardened steel article (e.g., a carburized and quenched gear) comprises hydrofluoric acid having a molar concentration of from 0.2 to 2 mol/l,...
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5425821 |
Iron aluminum based engine intake valves and its manufacturing method
The present invention resides in a method for making an internal combustion engine intake valve. An iron aluminum alloy, in the form of a coil or bar stock, is provided. The alloy comprises 76.05...
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5424028 |
Case carburized stainless steel alloy for high temperature applications
A case carburizable stainless steel alloy intended to be used at operating temperatures up to 700° F. The alloy is able to achieve and maintain a high surface hardness when carburized and heat...
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5383979 |
Process for producing a surface-hardened workpiece from sintered iron
In a process for producing a workpiece from sintered metal, especially from sintered iron, the latter is subjected, after sintering, to a steam treatment at temperatures below 500° C., especially...
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5382302 |
Method of producing a high tensile steel sheet having excellent stretch flanging formability
A high tensile steel sheet excelling in workability and stretch flanging formability, which is of a composite texture composed of a ferrite phase and a 2nd phase selected from the group consisting...
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5336338 |
Bearing components and process for producing same
A bearing component is prepared from a carburazing steel and having a surface hardness of 63 to 67 in terms of Rockwell hardness C and a surface retained austenite content of at least 20% to less...
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5268040 |
Method for steel surface hardening treatment and an apparatus therefor
A method of cooling steel parts from austenitic stage to a temperature that is higher than its Ms point after carburization of said steel part to carry out diffusion transformation, then carrying...
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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...
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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...
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5100483 |
Method of case hardening ferrometallic parts
A method of case hardening ferrometallic parts that avoids the use of protective coatings or shields is provided. The process comprises the steps of a) carburizing the entire part, b) machining the...
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5085714 |
Method of manufacturing a steel sheet
A method of manufacturing steel sheets by applying continuous annealing after applying hot rolling or hot rolling and cold rolling by a customary method to steel material, containing less than...
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5041167 |
Method of making steel member
A method for manufacturing a steel member which comprises the steps of preparing a steel material of a composition containing C in a quantity of 0.15 to 0.35 wt %, Si in a quantity of not greater...
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5019182 |
Method of forming hard steels by case hardening, shot-peening and aging without tempering
A method of manufacturing a steel member comprising the steps of: carburizing and quenching or carbo-nitriding and quenching a steel material; shot-peening the steel material quenched in the first...
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4918806 |
Method for manufacturing a piston
In a method for manufacturing a piston a metal piston is prepared which has a skirt tapered towards the bottom end to such an extent that a diameter of the metal piston becomes uniform after a heat...
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4837091 |
Diffusion alloy steel foil
A cold rolled solid solution iron-aluminum diffusion alloy foil and a method of making the foil are described. The foil has good room temperature formability and high temperature oxidation and...
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