Class 148/662 - Heating step follows cooling

Subclass of Class 148 - Metal treatment
Definition: Process in which a heating step follows a cooling step.
No. of patents: 33
Last issue date: 01/03/2006

Number	Title	Issue Date
6982012	Method of manufacturing steel sheet having excellent workability and shape accuracy A method of manufacturing a high strength steel sheet containing, in mass %, C: 0.02 to 0.04%, Si: at most 0.4%, Mn: 0.5-3.0%, P: at most 0.15%, S: at most 0.03%, Al: at most 0.50%, N: at most 0.01%, and Mo: 0.01-1.0%. The method includes performing hot rough rollin...	01/03/2006
6890665	Martensitic stainless steel and method for manufacturing the same Martensitic stainless steel whose steel composition is restricted within a specific range for each element is provided. The scale layer formed on the surface of the base material consists of an inner layer scale mainly including FeCr2O4 and an ...	05/10/2005
6884306	Baintic steel A mainly bainitic steel having the following composition in weight percent: carbon 0.6-1.1; silicon 1.5 to 2.0; manganese 1.8 to 4.0; chromium 1.2 to 1.4; nickel 0-3; molybdenum 0.2 to 0.5; vanadium 0.1 to 0.2, balance iron save for incidental impurities. ...	04/26/2005
6843867	Method of austempering steel parts A method of austempering of steel parts is described. The steel parts are initially austenitized and subsequently quenched to a start temperature which is higher than the martensite start temperature. Then the steel parts are subjected to a first isothermal holding ...	01/18/2005
6641931	Method of production of cold-rolled metal coated steel products, and the products obtained, having a low yield ratio The present invention aims to produce a cold rolled metal coated multi-phase steel, characterized by a tensile strength of at least 500 MPa, a yield ratio (Re/Rm) lower than 0.65 in skinned conditions, lower than 0.60 in unskinned conditions, and with goo...	11/04/2003
6632303	Stress relieved grinding ball having hard outer shell A grinding ball having a 55 to 65 Rockwell C hardened outer shell of tempered martensite is adapted for use in a heavy duty grinding environment by stress relieving to stabilize the ball against break-up and/or spalling....	10/14/2003
6586117	Steel sheet having excellent workability and shape accuracy and a method for its manufacture A steel for forming a high strength steel sheet contains, in mass %, C: at most 0.04%, Si: at most 0.4%, Mn: 0.5-3.0%, P: at most 0.15%, S: at most 0.03%, Al: at most 0.50%, N: at most 0.01%, and Mo: 0.01-1.0%. Steel sheet formed from the steel is suitabl...	07/01/2003
6565991	Composite doctor blade and its method of manufacture A composite doctor blade comprises a steel support band configured with a width and thickness suitable for mounting in a blade holder, with tensile and yield strengths suitable for a selected doctoring application. A wear resistant strip of high speed ste...	05/20/2003
6554926	Quenching heated metallic objects A method for quenching a heated metallic object includes discharging a plurality of discrete gas streams from a plurality of nozzle outlets so that the gas streams impinge substantially uniformly over the outer surface of the object, the distance between ...	04/29/2003
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
6537391	Steel with improved impact penetration resistance and method for producing the same A steel has a tensile strength of 850 to 1700 MPa, a yield ratio of at most 80%, and a penetration border energy ratio of at least 2.0 relative to the penetration border energy of a reference steel JIS SS400 (corresponding to ASTM A36) of the same thickne...	03/25/2003
6440584	Hot-dip galvanized steel sheet and method for producing the same A hot-dip galvanized steel sheet is produced by rough rolling a steel, finish rolling the rough rolled steel at a temperature of Ar3 point or more, coiling the finish rolled steel at a temperature of 700° C. or less, and hot-dip galvanizing the coiled st...	08/27/2002
6423427	Composite doctor blade and its method of manufacture A composite doctor blade comprises a steel support band configured with a width and thickness suitable for mounting in a blade holder, with tensile and yield strengths suitable for a selected doctoring application. A wear resistant strip of high speed ste...	07/23/2002
6423426	High tensile hot-dip zinc-coated steel plate excellent in ductility and method for production thereof A steel sheet having a composition comprising C: 0.05-0.20 mass %, Si: 0.3-1.8 mass %, Mn: 1.0-3.0 mass %, Fe of the balance and inevitable impurities is subjected to a primary step of primary heat treatment and subsequent rapid cooling to Ms point or low...	07/23/2002
6355119	Heat treatment method for producing boundary-layer hardened long products and flat products of unalloyed or low-alloy steel In a heat treatment method for producing boundary layer-hardened long products and flat products of unalloyed or low-alloy steel, the workpiece is cooled for producing a martensitic grain within a boundary layer of the workpiece by repeating several seque...	03/12/2002
6277214	Protective iron oxide scale on heat-treated irons and steels The invention provides a process for the heat treatment of iron-based alloys, including irons and steels, such as carbon steels and low alloy steels, in a controlled oxidative environment, to modify the microstructure of the metal to obtain both improved ...	08/21/2001
6251197	Rolling or sliding parts A rolling or sliding part is produced from a blank of steel material subjected to a heat treatment including carburization and thereby made to contain a spheroidal carbide precipitated and dispersed in a carburized layer matrix. The particle-to-particle d...	06/26/2001
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
6190472	Method of soft annealing high carbon steel A method for soft annealing of high carbon steel, characterized by taking objects to be soft annealed directly from a hot forming step and cooling to below Al-20° C.; heating the objects to Al+20° C. or above, and then cooling the objects down to beneath the...	02/20/2001
6187118	Method for heat-treating steel work pieces A method of heat-treating a work piece of high-alloy steel by hardening involves relatively briefly annealing the work piece before hardening, followed by cooling the work piece. The brief annealing that is performed before the actual hardening and the en...	02/13/2001
5900082	Method of making a heat treated steel casting and a heat treated steel casting A method of making a heat treated steel casting comprising the steps of taking an "as-cast" steel casting comprising not more than 0.2% carbon, a total alloy content of less than about 4%, a carbon equivalent, as herein defined, lying in the range 0.45-0....	05/04/1999
5885382	Primary cooling method in continuously annealing steel strip In a method of continuously annealing steel strip comprising a heating step (A), a soaking step (B), a primary cooling step (C) including a rapid cooling step at least in a second half thereof, an overaging step (D), and a final cooling step (E), inert at...	03/23/1999
5533770	High-strength solid wheels and tires for railroad traction vehicles and cars A steel for high-strength solid wheels and tires for railroad traction vehicles and cars that is more tenacious at the strengths typical of existing steels, and that is less likely to fracture even at constant braking. The steel has a specific ratio betwe...	07/09/1996
5342457	Method for the production of a switch diamond In a method for the production of a switch diamond for switch rails and double crossovers with a switch diamond point out of carbon steel and connector rails, the switch diamond point is rolled and submitted to heat treatment, by which the switch diamond ...	08/30/1994
5221374	Process for using agent for improving the hydrogen cracking resistance of low or intermediate-alloy steels, and pieces obtained The agent in question is cobalt added in contents of between 0.05% and 2% to steels containing from 0.05% to 0.6% of carbon and less than 10% of alloying elements taken from silicon, manganese, nickel, chromium and molybdenum, to produce optionally normal...	06/22/1993
5125987	Method for direct patenting of a hot-rolled wire rod A method for direct patenting of a hot-rolled wire rod comprises the steps of: transporting a hot-rolled wire rod on a conveyer in a state that said wire rod is in a form of continuous series of loops; blasting mist to the surface of said wire rod at leas...	06/30/1992
4544422	Ferrite-austenite dual phase steel A microalloy-free, high strength, low alloy, low carbon, manganese steel characterized by a dual phase microstructure wherein acicular retained austenite particles are distributed within a ferrite matrix. The ferrite-austenite microstructure is produced b...	10/01/1985
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
4067756	High strength, high ductility low carbon steel A high strength, high ductility low carbon steel consisting essentially of iron, 0.05-0.15 wt% carbon, and 1-3 wt% silicon. Minor amounts of other constituents may be present. The steel is characterized by a duplex ferrite-martensite microstructure in a f...	01/10/1978
4060431	Heat-treatable steel Parts made of a heat-treated alloy steel having a minimum tensile strength of 700 N/mm2 and a notch toughness of at least 55 joules, wherein the alloy steel is a Mn/Cr/Nb alloy steel of lower alloy content than has hitherto been used to provide...	11/29/1977
4052235	Method of preventing oxidation during water quenching of steel strip In a continuous annealing operation of a cold rolled steel strip involving water quenching and over-aging treatments, a method employing a cooling system comprising a pair of rolls arranged to contact the surfaces of a steel strip, a pair of cooling water...	10/04/1977
4026731	Method for heat treating wire Cooling by a gas coolant of carbon steel wire coils which have been heated to above the austenizing temperature of the wire is controlled to rapidly quench cool the wire coils to within a selected critical range of temperatures which results in a desired ...	05/31/1977
4016740	Method and an apparatus for the manufacture of a steel sheet A steel sheet, especially a thin one, can be manufactured from a hot rolled coil through heat treating steps by means of positively applying stress to the material. The product has excellent shape and mechanical properties such as drawability and toughnes...	04/12/1977

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Class 148/662 - Heating step follows cooling