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| Number | Title | Issue Date |
| 7147732 | Quenching method and apparatus A hot object is quenched after heat treatment. A hot gas stream having at least 20% by volume of hydrogen is taken from for example a carburising chamber of a furnace. The gas is cooled by passage through a heat exchanger, and is compressed in a compressor. The comp... | 12/12/2006 |
| 6143098 | Process and plant for thermal treatment of metals in protecting atmosphere A protective atmosphere for the heat-treatment of metals is obtained by heating a reactor containing a Nickel-based catalyst to a temperature of between 1000° C. and 1200° C., feeding to the reactor a flow of nitrogen having an oxygen content of between... | 11/07/2000 |
| 5788784 | Process for intermediately quenching light-metal castings coming from a solution heat treatment furnance This invention relates to a process for heat treating light-metal castings, particularly cylinder heads for piston engines, in which, after solidifying and removing the castings from the mold, they are solution treated with the residual casting heat at ap... | 08/04/1998 |
| 5505794 | Method for heat treating metallic materials and apparatus therefor The present invention presents a method and an apparatus for heat treating a metallic material by performing hydrogen absorption in or desorption from the metallic material. The method includes the steps of recovering the hydrogen gas released from a deso... | 04/09/1996 |
| 5366563 | Hot argon cleaning and protective coating of components made of metal or alloy The surfaces of a metal or alloy component are scrubbed by a high-velocity stream of inert gas at temperatures which facilitate removal of contaminants. Simultaneous with scrubbing, the impurities are captured in a separated loop of one or more "getter" f... | 11/22/1994 |
| 4756773 | Method for cooling a vacuum furnace A vacuum furnace is cooled in a two-step process. In the first step, a noble gas is injected into the furnace to break the vacuum, and to provide initial cooling. In the second step, a non-noble, but relatively inert, gas is injected into the furnace to c... | 07/12/1988 |
| 4738731 | Method of heat treating metal using a washable synthetic quenchant A method of quenching metal components utilizing a water based quenching composition which includes a polyvinylpyrrolidone polymer of high molecular weight and in relatively high concentrations and thereafter power washing the parts to remove the polymeri... | 04/19/1988 |
| 4528043 | Surface oxide layer treatment In Titanium casting the surface of the casting is usually contaminated with a brittle oxide layer which has to be removed. Physical or chemical machining reduces the dimensions of the casting and adds to its cost. Chemical reagents may remove fine surface... | 07/09/1985 |
| 4257829 | Method for cooling an aluminum strip during the process of heat treatment During the process of movement of an aluminum strip in a floating mode, the strip is first heated and then cooled for the annealing. In cooling the aluminum strip, the aluminum strip is first cooled to a predetermined temperature at an easy cooling temper... | 03/24/1981 |
| 4243439 | Process of quenching metal pieces and product produced The invention concerns a new process for quenching metallic pieces and intended to limit the stresses engendered by quenching without essentially affecting the characteristics. This process consists of quenching the pieces by immersion in a binder of the ... | 01/06/1981 |
| 4158579 | Method for recycling heat treating salts A system for recycling heat treating salts such as nitrates and nitrites from a rinse bath including means to prevent the excessive build-up of impurities such as carbonates or chlorides which impair heat treat efficiency. For example, carbonates which fo... | 06/19/1979 |
| 4077814 | Method for thermally treating metal components A method for thermally treating metal components. The metal components which are in a partially finished condition are annealed by being placed within a liquid bath which is at a temperature between 200° and 300° C. The liquid bath is a mineral oil and ... | 03/07/1978 |
| 4069071 | Method for generating a reducing atmosphere for heat-treating installations An atmosphere of nitrogen containing hydrogen is generated by cracking amia and recycling a previously generated atmosphere that already had been used. The atmosphere generated by cracking, and the recovered atmosphere that previously had been used, are ... | 01/17/1978 |
| 4036478 | Liquid quenching system A liquid quenching system for use with continuous furnaces for heat treating small parts wherein the quenchant is used to both quench and convey the parts. A supply conduit connects a quench liquid reservoir to a connector between the furnace and a quench... | 07/19/1977 |
| 4011110 | Method and apparatus for forming and treating bundles of steel rods A hot steel rod which issues from the last pass of a rod mill is coiled at a level above a bath of molten salt and successive coils are caused to descend in the bath toward a platform on which they accumulate to form a bundle. The coils are out of contact... | 03/08/1977 |
| 3975142 | Heat shield composition A stable, heat-protective aqueous composition formed by admixing boric acid, asbestos and glycerol, with water added to provide the desired consistency, the composition being particularly suitable to absorb and disperse heat at elevated temperatures while... | 08/17/1976 |
| 3966508 | Treating waste discharge liquids from metal hardening baths, particularly containing nitrite and nitrate compounds To improve recovery of nitrate-nitrite compounds from effluent of nitriding processes, a melt of the nitrate-nitrite salts is prepared and maintained at a temperature above about 400° C; the effluent liquid is introduced into the melt, to evaporate the w... | 06/29/1976 |
| 3964734 | Apparatus for thermally treating metal components Apparatus for thermally treating metal components. The metal components which are in a partially finished condition are annealed by being placed within a liquid bath which is at a temperature of between 200° and 300° C. The liquid bath is oil and is sit... | 06/22/1976 |
| 3953248 | Method and apparatus for reclaiming heat treating salt Heat treating salt used as a bath in heat treating metal articles is reclaimed from the rinsing tank in a closed cycle by removing a portion of the salt-contaminated rinse water from the rinsing tank to an enclosed portion of the heat treating tank which ... | 04/27/1976 |
| 3945623 | Device for cooling metal wire The invention relates to a machine for cooling metal wire. This machine comprises a cooling tube, an injection device for the cooling fluid and a bypass device for the cooling fluid. The injection device comprises an oblique annular slot fed under high pr... | 03/23/1976 |
