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| Number | Title | Issue Date |
| 7713362 | Method for making an abrasion resistant steel plate and plate obtained A method for producing a plate of steel which is resistant to abrasion and whose chemical composition includes, by weight: 0.24%≦C | 05/11/2010 |
| 7462251 | Method for making an abrasion-resistant steel plate The invention concerns a method for making an abrasion-resistant steel part consisting of 0.1%≦C≦0.23%; 0%≦Si≦2%; 0%≦AI≦2%; 0.5%≦Si+AI≦2%; 0%≦Mn≦2.5%; 0%≦Ni≦5%; 0%≦Cr≦5%; 0%≦Mo≦1%; 0%≦W≦2%; 0.05%≦Mo+W/2≦1%; 0%≦B≦0.02%; 0%â... | 12/09/2008 |
| 7459041 | Method for making an abrasion-resistant steel plate The invention concerns a method for making an abrasion resistant steel plate having a chemical composition comprising: 0.35%≦C≦0.8%, 0%≦Si≦2%; 0%≦AI≦2%; 0.35%≦Si+AI≦2%; 0%≦Mn≦2.5%; 0%≦Ni≦5%; 0% ≦Cr≦5%; 0%≦Mo≦0.050; 0%≦W≦1%; 0,1%â‰... | 12/02/2008 |
| 7393422 | Method for producing high carbon steel wire rod superior in wire-drawability The high carbon steel wire rod contains 0.65% to 1.20% of C, 0.05% to 1.2% of Si, 0.2% to 1.0% of Mn, and 0.35% or less (including 0%) of Cr, further contains P and S each in an amount restricted to 0.02% or less, where 80% or more of the metal structure is constitu... | 07/01/2008 |
| 7214278 | High-strength four-phase steel alloys A carbon steel alloy that exhibits the combined properties of high strength, ductility, and corrosion resistance is one whose microstructure contains ferrite regions combined with martensite-austenite regions, with carbide precipitates dispersed in the ferrite regio... | 05/08/2007 |
| 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 transformation process, at a given temperature (TE); b) carry... | 05/02/2006 |
| 6863749 | Method of improving the toughness of low-carbon, high-strength steels A method of post-solidification processing to minimize the content of extremely coarse grain-refining precipitates that may form during solidification is low-alloy and alloy high-strength steels containing approximately 0.09-0.17% by weight C so as to provide improv... | 03/08/2005 |
| 6821364 | Method of making a multiphase hot-rolled steel strip The invention concerns a method for making a multiphase hot-rolled steel strip comprising an ultra-fast cooling operations, which consists in carrying out said ultra-fast cooling operation after controlled slow cooling of the strip on a conventional slow cooling tab... | 11/23/2004 |
| 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 |
| 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 |
| 6387195 | Rapid quench of large selection precipitation hardenable alloys Large sections of solution annealed, precipitation hardenable alloys which are resistant to internal cracking yet fully hardenable can be produced if, during rapid quenching, the temperature of the section is allowed to stabilize immediately above the all... | 05/14/2002 |
| 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 |
| 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 |
| 5961747 | Tin-bearing free-machining steel The invention relates to free-machining steels which do not rely on lead as a means of enhancing machinability. Instead, the steels of the invention employ concentrations of tin at ferrite grain boundaries to replicate a role of lead, which the inventors ... | 10/05/1999 |
| 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 |
| 5840136 | Temperature-raising bainite forming process A bainite forming process for treating a steel material reduces the time required for a complete thermal treatment as well as the cycle time for the thermal treatment device without necessitating any special means for handling the steel material. The stee... | 11/24/1998 |
| 4775429 | Large diameter high strength rolled steel bar and a process for the production of the same A large diameter high strength hot rolled steel bar consisting of a low alloy steel having a carbon content of 0.3 to 0.9% and a metallurgical structure with a interlammelar spacing of 0.05 to 0.15 μm, and having a diameter of at least 20 mm, a tensile s... | 10/04/1988 |
| 4755236 | Method of annealing using diffuser system for annealing furnace with water cooled base A convection diffuser and charge support system for an annealing furnace utilizes a diffuser base assembly that includes a vane-carrying center casting which underlies a charge support plate, and which is perimetrically surrounded by a pair of outer and i... | 07/05/1988 |
| 4715907 | Method for heat treating ferrous parts Ferrous parts are heat treated by preheating the part to an elevated temperature, inductively heating the preheated part to an austenitizing temperature followed by quenching and isothermal transformation in a media maintained at a predetermined isotherma... | 12/29/1987 |
| 4714500 | Method for thermal treatment of pearlitic rail steels The present invention relates to a method for thermal treatment of pearlitic rail steel. For increasing strength and wear resistance steels with the claimed composition are produced with a fine lamellar pearlite structure by heat treatment. During the fir... | 12/22/1987 |
| 4704167 | Method and apparatus for cooling steel strip In a cooling zone of a continuous annealing line engineered to continuously process longitudinally travelling steel strip, the strip is first slowly cooled to a desired temperature at a rate of not higher than 20° C./sec. by means of a jet stream of cool... | 11/03/1987 |
| 4637844 | Method for heat treating ferrous parts Ferrous parts are heat treated by preheating the part to an elevated temperature, inductively heating the preheated part to an austenitizing temperature followed by quenching and isothermal transformation in a media maintained at a predetermined isotherma... | 01/20/1987 |
| 4564402 | Method for preventing disbonding of weld-cladding Disclosed is a method for preventing hydrogen-induced disbonding of austenitic stainless steel cladding, which is made on a low alloy steel, in a reactor vessel which has been used in a high-temperature and high-pressure hydrogen atmosphere. The clad stee... | 01/14/1986 |
| 4531983 | Method of deep hardening of workpieces A method for deep hardening steel workpieces which are subject to high surface pressures by first heating the workpiece and then quenching the thus heated workpiece to cool to a range just above the martensite stage, the temperature is held in this range ... | 07/30/1985 |
| 4509995 | Method and apparatus for quenching A quenching method wherein an object to be quenched is sprayed with a mixed spray jet of a liquid and a gas. The diameter of droplets in the mixed spray jet is from 50 to 200 μm, and the mixing ratio between the liquid and the gas is varied during the pe... | 04/09/1985 |
| 4448614 | Process for cooling a cold rolled steel strip A cold rolled steel strip having an elevated temperature is continuously cooled to a desired temperature at a desired cooling rate by a process comprising moving the cold rolled steel strip along at least one vertical cooling path, and; bringing a plurali... | 05/15/1984 |
| 4358325 | Method of treating low carbon steel for improved formability A method is provided for improving the formability of low carbon steel sheet by heating it to a temperature above about 250° C. such that the interstitial element content of the steel's ferrite matrix is in the range of from about 5 to 50 parts by weight... | 11/09/1982 |
| 4282048 | Method for cooling hot-rolled shapes A walking beam section of a cooling bed receives hot lengths of rails or beams for cooling through a first temperature range. Beams are turned at the end of the walking-beam section and positioned into a layered collection after which the collection is tr... | 08/04/1981 |
| 4225365 | Lower bainite alloy steel article and method of making same A lower bainite alloy steel article particularly suitable for gears, bushings and the like includes carbon in the range of 0.60 to 0.80 Wt.%, manganese in the range of 0.45 to 1.00 Wt.%, silicon in the range of 0.15 to 2.20 Wt.%, molybdenum in the range o... | 09/30/1980 |
| 4222257 | Method of manufacturing rolled wire rod A method and apparatus of manufacturing wire rod having a content of silicon and manganese greater than 1.5% is described, wherein the average final rolling temperature in processing the rod is from 870° C. to 970° C. and the rod is cooled in an extende... | 09/16/1980 |
| 4203783 | Process for improving the quality of steel sections The elastic limit and breaking load of steel sections are improved by a process of surface quenching and self-tempering comprising a cooling stage followed by rapid cooling which is interrupted to allow the quenched surface layer of the section to be temp... | 05/20/1980 |
| 4175985 | Method of producing steel sections of improved quality A steel section 6 to 40 mm thick, emerging from a hot rolling mill at 1000° to 800° C. is surface quenched for 2 to 6 seconds at a cooling rate of the order of 1.5 to 5 MW/m2. During subsequent self-tempering of the quenched surface by heat f... | 11/27/1979 |
| 4082577 | Process for the heat treatment of steel A process for the heat treatment of a steel rail which is at a temperature which is in the austenite range which comprises quenching at least the head portion of said rail in water maintained at a temperature of at least 80° C until the temperature of sa... | 04/04/1978 |
| 4032368 | Intercritical-cycle annealing Hypoeutectoid steel is heated to an intercritical temperature to produce a microstructure of about 30-50% austenite. The steel is then cooled as rapidly as feasible to a temperature below As and held at temperature to transform the austenitic p... | 06/28/1977 |
| 4023987 | Method of producing soft thin steel sheet by continuous annealing A continuous annealing process for producing a soft tin plate and black plate with T - 21/2 or T - 3 tempering properties is attained in a conventional continuous annealing furnace for black plate by the use of a novel steel strip composition.... | 05/17/1977 |
| 3963535 | Method for controlling quenching A method for regulated cooling of hot objects by liquid medium or media in which the cooling is varied by varying the pressure under which said cooling takes place, and means for carrying out the method, said means comprising an open or closed container f... | 06/15/1976 |
| 3940294 | Cooling of hot rolled steel stock This invention relates to a method of cooling hot rolled coiled bar in which the bar is water-cooled immediately after rolling to a temperature (t1 ') at which it is still sufficiently ductile to be readily coiled, in which it is then forced ai... | 02/24/1976 |
