Class 148/612 - Starting material contains 1.7 percent or more carbon (e.g., cast iron, etc.)

Subclass of Class 148 - Metal treatment
Definition: Process wherein the iron alloy contains 1.7 percent or more
No. of patents: 36
Last issue date: 04/08/2008

Number	Title	Issue Date
7354549	Cast iron member manufacturing method A nitrogen trapping agent is added by a metering hopper to raw materials, which are melted and poured into a mold cavity of a metal mold device (18). The molten metal is then cooled and solidified into a casting (B). Before the molten metal is fully cooled an...	04/08/2008
7163594	High tensile strength gray iron alloy A gray iron alloy having a composition comprising about 4.10% to about 4.25% carbon equivalent, about 3.5% to about 3.65% carbon, about 0.4% to about 0.9% manganese, about 1.5% to about 1.9% silicon, less than about 0.12% phosphorous, less than about 0.17% sulfur, a...	01/16/2007
7163593	Iron-based alloy and method for production thereof An iron-based alloy comprises 1.5 to 2.5 wt % of C, 0.25 to 4.75 wt % of Ni, and W and V in quantities surrounded by the line L as shown in FIG. 1 of the attached drawings with a balance of Fe and inevitable impurities. The iron-based alloy is obtained by a f...	01/16/2007
7070666	Machinable austempered cast iron article having improved machinability, fatigue performance, and resistance to environmental cracking and a method of making the same A machinable austempered cast iron article has improved strength, machinability, fatigue performance, and resistance to environmental cracking. A method of making the machinable austempered cast iron article includes austenitizing an iron composition having a substa...	07/04/2006
6823706	Steel wire and method of manufacturing the same A steel wire, 0.10-0.40 mm in diameter, obtained by subjecting a high-carbon (0.70-0.90 wt. %) steel wire material to heat treatment and wire drawing, wherein its tensile strength and test values of special repeated torsional tests satisfy a predetermined relation; ...	11/30/2004
6800152	Process for making iron-based casting alloy A process for making an iron-based casting alloy is performed by combining an iron-carbon-chromium system with primary carbides of vanadium, niobium, titanium, or combinations thereof without eutectic carbides of vanadium, niobium and titanium. Eutectic chromium car...	10/05/2004
6746550	Compacted graphite cast iron alloy and its method of making A process for producing a compacted graphite iron (CGI) article, comprising the steps of: (a) providing a CGI base iron having a composition comprising, in weight percentages, about 3.2 to 3.8 total C, 2.8 to 4.0 Si and the balance at least Fe and incidental impurit...	06/08/2004
6732698	Austempered gray iron cylinder liner and method of manufacture A cylinder liner for high temperature, high performance engine applications is cast from gray iron material and thereafter austempered for a time sufficient to achieve a substantially bainitic microstructure that is stable against excessive thermal growth when the l...	05/11/2004
6706416	Process for manufacturing corrosion resistant composite metal products A method of producing a corrosion resistant ferrous product is disclosed. The product is produced by rolling a heated billet which comprises a mass of mild steel swarf in a stainless steel jacket. Two reducing agents are present in the jacket when the billet is heat...	03/16/2004
6544359	Method to produce compacted graphite iron (CGI) The invention relates to a method of producing objects of cast iron containing compacted (vermicular) graphite crystals, by preparing a cast iron melt having substantially a carbon content at the desired final level and a silicon content below the desired...	04/08/2003
6537397	Process for producing Fe-based member having high young's modulus, and Fe-based member having high young's modulus and high toughness In producing an Fe-based member, an Fe-based material comprising 0.6% by weightࣘcarbon (C)ࣘ1.0% by weight silicon (Si)	03/25/2003
6527878	Thixocast casting material, process for preparing thixocasting semi-molten casting material, thixocast process, fe-based cast product, and process for thermally treating fe-based cast product A thixocast casting material is formed of an Fe--C--Si based alloy in which an angle endothermic section due to the melting of a eutectic crystal exists in a latent heat distribution curve and has a eutectic crystal amount Ec in a range of 10% by weight	03/04/2003
6398881	Wear-resistant camshaft and method of producing the same The invention concerns a wear-resistant camshaft and a method of producing the same. Objects in which the application of the invention is possible and useful are all cast-iron parts which are subject to wear as a result of lubricated friction. The wear-re...	06/04/2002
6352141	Bainitically hardened brake disk The invention relates to a bainitically hardened brake disk comprising at least one ring-shaped cast disk (1) body with radially extending ring sections in contact with brake shoes (2). Said brake disk is mounted on the hub of a bicycle wheel (5) for brak...	03/05/2002
6332938	Process for producing Fe-based member having high young's modulus and high toughness The present invention produces an Fe-based member having a high Young's modulus and a high toughness. In producing an Fe-based member, a first step and a second step are sequentially carried out. At the first step, an Fe-based material comprising 1.5% by ...	12/25/2001
6258180	Wear resistant ductile iron Austempered ductile iron castings having primary iron carbides uniformly dispersed throughout an ausferritic matrix, and methods of making the same, are described. The dissolution of the primary iron carbides into the ausferritic matrix during the austemp...	07/10/2001
6203634	Method for heat-treating steel or cast iron components A method for heat-treating a component of steel or cast iron, particularly a through hardening bearing steel component, involves heating the component to the austenitization temperature and holding the component at the austenitization temperature to achie...	03/20/2001
5985052	Abrasion-resistant material An abrasion-resistant material is constructed from gray iron alloyed with 0.30 to 0.70% phosphorous. The high phosphorous cast iron alloy is heat treated for approximately 120 minutes to an austenitizing temperature of about 1600° F. Next, the alloy is a...	11/16/1999
5753055	Process for austempering ductile iron A process for austempering ductile iron includes austenitizing a ductile iron casting of low alloy content followed by quenching the workpiece for a controlled period of time in a quench medium such as water, an aqueous polymer solution or a medium speed ...	05/19/1998
5603784	Method for producing a rotatable gray iron brake component A method for producing a brake component involves providing a cast gray iron rotatable brake component where the gray iron has a carbon content between 3.4% and 4.0%. The brake component is subjected to an austempering heat treatment process. Then it is s...	02/18/1997
5352305	Prestressed brake drum or rotor Uniformly distributed compressive stresses are induced in the machined surfaces of brake drums and brake rotors. The compressive stresses cancel residual tensile stresses induced in the surfaces by machining operations during fabrication. Cancellation of ...	10/04/1994
5246510	Method for producing a selectively surface hardened cast iron part A method for producing a selectively surface hardened cast iron part includes the steps of (a) heating the part to a desired austempering temperature of between about 450° F. and about 800° F. until the entire cast iron part possesses the desired austem...	09/21/1993
5183518	Cryogenically super-hardened high-chromium white cast iron and method thereof A highly abrasion-resistant, high-chromium white cast iron alloy containing the following elemental analysis in percent by weight: 2.4-3.8% carbon, 0.4 to 2.0% manganese, 0.2 to 1.9% silicon, 0.0 to 3.0% copper, 1.5 to 4.5% nickel, 12.0 to 29.0% chromium,...	02/02/1993
5122197	Method of producing cast-iron product A cast-iron product has a composition of 4.3-4.9 wt. % Carbon Equivalent (CE), 0.25-0.5 wt. % Chromium (Cr), 0.05-0.12 wt. % Tin (Sn), 0.4-1.2 wt. % Manganese (Mn), 0-0.1 wt. % Phosphorus (P), and 0-0.15 wt. % Sulfur (S), with the balance being Iron (Fe)....	06/16/1992
4961791	Pig iron for the manufacture of brake bodies A pig iron for the manufacture of brake bodies, specially ventilated brake discs, which poured in cast-iron molds has a tensile strength of at least 250 N/mm2 and consisting essentially of: carbon in an amount 3.65 to 3.75 weight %; manganese in an ...	10/09/1990
4948437	Process for the heat-after treatment of a pig iron port A iron alloy material for the manufacture of brake drums, specially of massive and ventilated brake discs and other braking bodies, which has a pearlitic structure with a 5% maximum portion of ferrite, and a tensile strength of at least 200N/mm2	08/14/1990
4891076	Gray cast iron having both increased wear resistance and toughness A method is disclosed for making gray iron having both increased wear resistance and impact toughness, comprising: (a) solidifying a hypoeutectic gray iron melt (i) to which has been added a eutectic carbide forming agent in an amount of 0.3-0.8% by weigh...	01/02/1990
4889687	Nodular cast iron having a high impact strength and process of treating the same Nodular cast iron having favorable mechanical properties, in particular a high impact strength at low temperatures, comprising: from 3.0 to 4.0% of carbon; from 1.5 to 2.3% of silicon; less than 0.3% of manganese; not more than 0.03% of phosphorus; less t...	12/26/1989
4863533	Apex seal for rotary piston engine and method for manufacturing the same An apex seal consisting of 3.0 to 4.0 wt % of C, 1.5 to 2.5 wt % of Si, 0.3 to 1.0 wt % Mn, 0.05 to 0.3 wt % of P, less than 0.1 wt % of S, 0.005 to 0.025 wt % of Mg or Ce, 0.5 to 2.0 wt % of Cu and/or 0.5 to 3.0 wt % of Ni, 0.4 to 1.0 wt % of Cr, 1.0 to ...	09/05/1989
4666533	Hardenable cast iron and the method of making cast iron A method is disclosed for forming a surface hardenable cast iron article by development of metastable retained austenite in the cell boundary of a ductile or semiductile cast iron. The method comprises (a) controlling the solidification of a cast iron mel...	05/19/1987
4617069	Method for improving the immunity to temperature changes of cast iron containing lamellar graphite A method is disclosed for improving the immunity to temperature changes of cast iron containing lamellar graphite. The structure of the cast iron melt is suitably adjusted by means of carbide forming agents, to wit chromium and/or molybdenum and an anneal...	10/14/1986
4617070	Method of making wear-resistant cylinder, or cylinder liner surfaces In order to prevent the formation of fissures or tears in the walls of cylinders of an internal combustion engine, hardening tracks (4) generated by a carbon dioxide laser, are placed parallel to each other at an angle of inclination (଱) with respec...	10/14/1986
4467510	Method of conditioning a rotary valve seat A method of forming concavities in a cast iron valve seat to which lubricating oil may be applied to reduce the abrasion between the valve seat and a handle operated rotary valve that is slidably engagable with the valve seat. Pockets of graphite are form...	08/28/1984
4448613	Divorced eutectoid transformation process and product of ultrahigh carbon steels An ultrahigh carbon steel consisting of a structure formed by divorced eutectoid transformation with or without accompanying deformation such that substantially no pearlite is formed, having a fine grained iron matrix stabilized by cementite in spheroidiz...	05/15/1984
4395284	Abrasion resistant machinable white cast iron A cast iron alloy composition comprising 2.5-3.5% carbon, 0.5-1.0% manganese, 0.25-1.5% silicon, 13-19% chromium, 0.8-3.0% nickel, balance essentially iron which is machinable in the annealed condition and abrasion resistant in the hardened condition. The...	07/26/1983
4043844	Heat-treated cast grinding members Heat-treated cast grinding members for use in a grinding mills such as grinding balls, lining plates, crushing jaws, etc. are disclosed, which members are subjected to abrasion and repeated impact in the presence of a wet corrosive medium. These members c...	08/23/1977

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Class 148/612 - Starting material contains 1.7 percent or more carbon (e.g., cast iron, etc.)