| Patents for C21D 1 - General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering (27,435) |
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| 08/07/1991 | EP0439614A1 Gas mixture for thermo-chemical treatment of metals and alloys and method of obtaining it |
| 08/07/1991 | CA2035634A1 Skid rail using fe/cr dispersion strengthened alloys |
| 08/07/1991 | CA2035618A1 Skid rail alloy |
| 08/06/1991 | US5037491 Shallow case hardening and corrosion inhibition process |
| 08/06/1991 | US5037490 Process for allowing pretreatment of assembled camshaft components |
| 08/01/1991 | DE4002348A1 Metal soldering - uses evaporation of a surface for cleaning, and surface tension reduction using vapour pressure and heat |
| 07/30/1991 | US5035611 Apparatus for controlling gas flows in vacuum furnaces |
| 07/30/1991 | US5035405 Apparatus for annealing and quenching |
| 07/30/1991 | US5035403 Apparatus for cooling a cylindrical member in linear motion |
| 07/25/1991 | DE4001280A1 Vorrichtung zur oberflaechenbehandlung von werkstuecken mittels lichtstrahlen Apparatus for the surface finishing of workpieces by means of beams |
| 07/24/1991 | EP0438366A1 Inductor for an induction furnace, comprising a liquid-cooled tube |
| 07/24/1991 | EP0438268A1 Boronized sliding material having high strength and method for producing the same |
| 07/24/1991 | EP0437454A1 Process and device for surface hardening of crack-prone work pieces. |
| 07/24/1991 | CN2081391U Electronic quenching instrument |
| 07/23/1991 | US5034586 Induction heating assembly including an interposed closed conductive loop for suppression of intercoil coupling |
| 07/23/1991 | US5034069 Low white cast iron grinding slug |
| 07/23/1991 | US5033927 Device for carrying out sequential thermal treatments under a vacuum |
| 07/23/1991 | US5033926 Heat retaining means |
| 07/23/1991 | CA1286575C Preheating method of steel strips |
| 07/19/1991 | WO1991010751A1 Device for treating the surfaces of workpieces with light beams |
| 07/19/1991 | CA2074265A1 Device for treating the surfaces of workpieces with light beams |
| 07/16/1991 | US5032947 Method of improving magnetic devices by applying AC or pulsed current |
| 07/16/1991 | US5032191 Heat treatment |
| 07/16/1991 | CA1286209C Production of high strength seamless steel pipe with superior resistanceagainst sulfide stress corrosion cracking |
| 07/16/1991 | CA1286207C Process for laser hardening drilling bit cones having hard cutter inserts |
| 07/11/1991 | WO1991009980A1 Production of anticorrosive and antiwearing alloy |
| 07/11/1991 | WO1991009976A1 Apparatus and method for cooling a furnace load |
| 07/11/1991 | CA2007591A1 Gas mixture for thermochemical treatment of metals and alloys, process and apparatus for preparing |
| 07/10/1991 | EP0436099A1 Apparatus for separating gas from a liquid |
| 07/10/1991 | CN2080736U Electric induction heating device for steel rail end hardening apparatus |
| 07/10/1991 | CN1052902A Heat treatment of metallic concave mould |
| 07/10/1991 | CN1013123B Fe-mn-al-c austenite containing nonmagnetic and low-temp. steels |
| 07/10/1991 | CN1013121B Remelting hardening technique for the surface of ductile iron workpieces |
| 07/09/1991 | US5030805 Condensation heating apparatus |
| 07/09/1991 | US5030298 Process for producing a hot rolled steel sheet with high strength and distinguished formability |
| 07/04/1991 | DE4040520A1 Transmission shaft made of iron alloy - with outer hardened and inner relatively unhardened layers |
| 07/03/1991 | EP0435033A1 Method for providing and distributing treatment gases for heat treatments |
| 07/03/1991 | CN1052704A Nitriding furnace apparatus |
| 07/02/1991 | US5028491 Gamma titanium aluminum alloys modified by chromium and tantalum and method of preparation |
| 07/02/1991 | US5028281 Camshaft |
| 06/26/1991 | EP0434183A2 Nitriding furnace |
| 06/26/1991 | EP0124574B1 Method and apparatus for the manufacture of non-allergy creating precious metal objects |
| 06/23/1991 | WO1991009933A1 Steel wire having a structure of the cold-drawn lower bainite type; method for producing such wire |
| 06/23/1991 | CA2069511A1 Steel wire having a structure of the cold-drawn lower bainite type and method for producing such wire |
| 06/18/1991 | US5025129 Reactor vessel annealing system |
| 06/13/1991 | WO1991008089A1 A steel bar and billet heating system located upstream of shears for further processing |
| 06/12/1991 | EP0431250A1 Scale removing composition and method |
| 06/12/1991 | CN1012825B Cyclic annealing technique for making low manganese dual-phase steel |
| 06/12/1991 | CA2005466A1 Air-cooling duplex bainite-martensite steels |
| 06/11/1991 | US5022936 Melting treatment resulting in chromium depleted layer changed to delta ferrite; corrosion resistance; reduced tensile stress |
| 06/11/1991 | US5022934 Heat treating a metallic workpiece in a fluidized bed |
| 06/11/1991 | US5022933 Process for annealing boron-containing steels and product thereof |
| 06/11/1991 | CA1284824C Inductor for inductive heating of metallurgical products |
| 06/11/1991 | CA1284723C Apparatus and method for the deep cryogenic treatment of materials |
| 06/05/1991 | EP0430314A2 Method and device for producing a protective atmosphere |
| 06/05/1991 | EP0430313A2 Method and device for producing a protective atmosphere |
| 06/05/1991 | EP0429796A1 Heat-resistant materials |
| 06/05/1991 | CN2078323U Half-ring quenching response device |
| 06/05/1991 | CN1051940A Surface quenching technology for dichromium-13 by argon plasma arc |
| 06/04/1991 | US5020208 Process for heating a semifinished product produced by continuous casting or deformation |
| 05/29/1991 | EP0429394A1 Cooling of cast strand |
| 05/29/1991 | EP0429094A1 High strength low carbon steels, steel articles thereof and method for manufacturing the steels |
| 05/29/1991 | EP0428787A1 Industrial vacuum furnace |
| 05/28/1991 | US5019182 Method of forming hard steels by case hardening, shot-peening and aging without tempering |
| 05/28/1991 | US5018707 Heating furnace |
| 05/28/1991 | US5018551 Device for injecting gas under high pressure and high flow rate into an airtight treatment chamber and for recovery of the same |
| 05/24/1991 | CA2030261A1 Cooling of cast billets |
| 05/22/1991 | CN2077447U Plasma arc burner cap for hardening metal surface |
| 05/21/1991 | US5017761 Fiber-optic heater probe assembly for heat treating metallic conduits |
| 05/21/1991 | US5017248 Hot rolled steel sheet with high strength and distinguished formability |
| 05/21/1991 | US5016860 "No-nick" part-handling apparatus and method |
| 05/15/1991 | EP0426903A1 Procedure for the treatment of the surface of a metal receptacle and receptacle treated according to this procedure |
| 05/15/1991 | CN1012624B Long metallic articles quenching process |
| 05/15/1991 | CN1012623B Process for heat-treatment workpieces and the heat-treatment equipment for the process |
| 05/08/1991 | EP0425863A1 Heat treatment of drive shafts |
| 05/08/1991 | CN1051201A Prepn. of pumping rod without heat treatment |
| 05/07/1991 | US5013370 Method of analyzing cracking at welded joints |
| 05/07/1991 | US5012980 Linear-spraying device |
| 05/06/1991 | CA2002345A1 Humidifying apparatus |
| 05/02/1991 | WO1991005880A1 Method for preparing very high quality magnetic materials |
| 05/02/1991 | EP0425461A1 Continuous solution heat treatment of precipitation hardenable alloys |
| 05/02/1991 | DE3935929A1 Convective heat treatment unit for e.g. semi-finished wire - uses gas steam for rapid cooling of wire positioned transverse to flow in venturi-line guide |
| 04/30/1991 | US5011548 Composition for deboronizing grain-oriented silicon steel |
| 04/25/1991 | DE4003728C1 Uneven rotation detector for transport rollers in tunnel furnace - has measuring units for devices assigned to rollers to deliver magnetic, EM, acoustic or optical signals |
| 04/24/1991 | EP0424211A1 Method of plasma surface treatment of metallurgical products |
| 04/24/1991 | EP0423710A1 Multiple chamber vacuum installation |
| 04/24/1991 | CN2075654U Steam fog quenching device |
| 04/24/1991 | CN1050903A Process for improving cold formability of heat-treatable steels |
| 04/23/1991 | US5009395 Method and apparatus for selectively heating a workpiece subjected to low temperature thermomechanical processing |
| 04/23/1991 | US5009000 Overcoating steel plunger with boronized case; heating; quenching |
| 04/18/1991 | CA2027703A1 Process for the surface treatment of steel products by the action of a plasma |
| 04/17/1991 | EP0422378A1 Method of improving the cold workability of hardenable steels |
| 04/17/1991 | EP0422353A2 Furnace for the partial thermic treatment of tools |
| 04/13/1991 | CA2026307A1 Process for improving the cold formability of heat-treatable steels |
| 04/11/1991 | DE3929145C1 Solid copper inductor for surface hardening workpieces - is split into 2 halves with power supplied to both fixed and movable halves, and is equipped with cooling channels |
| 04/03/1991 | EP0419675A1 Sticker for preventing carburization, nitridation or oxidation, and method of preventing carburization, nitridation or oxidation |
| 04/02/1991 | US5004213 Leaf-spring hardener |
| 03/28/1991 | DE4003363C1 Hardening rails from rolling temp. - using appts. with manipulator engaging rail from exit roller table with support arms positioned pivotably on each side |
| 03/28/1991 | DE3930973A1 Cooling process for steel blanks - uses blocks of ice, applied to two sides of steel |
| 03/27/1991 | EP0419300A2 Roller with conical shank |