| Patents for C21D 1 - General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering (27,435) |
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| 03/27/1991 | EP0418506A1 Steel hardening method with liquid cooling media |
| 03/27/1991 | EP0224587B1 Method of correcting warping of two-layer clad metal plate |
| 03/27/1991 | CN2073881U Hot tube type coaling isothermal quenching salt-bath furnace |
| 03/26/1991 | US5003551 Induction melting of metals without a crucible |
| 03/26/1991 | US5001917 Method and apparatus for truing or straightening out of true work pieces |
| 03/21/1991 | DE4009770A1 Coolant stripping device for rolled prods. - includes air blowing channel feeding into guide section just before widened funnel section |
| 03/20/1991 | EP0393137A4 Carburized low silicon steel article and process |
| 03/20/1991 | CN1050045A Technology and equipment used for heating of blank material of spring |
| 03/19/1991 | CA1281794C Method of cooling hot-rolled steel plate |
| 03/14/1991 | DE4009742A1 Coolant water stripper device for rolled prodn. - has line of water stripper dice arranged behind cooling tube |
| 03/13/1991 | EP0416988A1 Device for laser shock treatment of work pieces |
| 03/07/1991 | WO1991002695A1 Gas mixture for thermo-chemical treatment of metals and alloys and method of obtaining it |
| 03/07/1991 | DE4010670A1 Heat treated steel with improved mechanical properties - has normalised skin around non-normalised ferrite-perlite core to give high strength steel for sections and reinforcing |
| 03/07/1991 | DE3929829A1 Heat treatment cooling for cylindrical steel parts and containers - has part in continuous variable speed rotation sprayed with water at varying rate to maintain precise temp. gradient |
| 03/07/1991 | CA2024149A1 Heat-treated steel with improved mechanical and technological properties |
| 03/06/1991 | EP0415811A1 Heat treatment furnace with cooling means |
| 03/06/1991 | EP0259414B1 Apparatus for thermal treatments of thin parts such as silicon wafers |
| 02/28/1991 | DE4019635A1 Resistance heat treating of a ferromagnetic amorphous strip - using alternating or pulsed current with direct current magnetic field to improve magnetic properties |
| 02/20/1991 | CN1011706B Heat treatment method for perforating head |
| 02/14/1991 | DE3926540A1 Verfahren einer laserbestrahlung beschichteter werkstuecke und vorrichtug zur durchfuehrung des verfahrens Method of laser irradiation coated workpieces and vorrichtug for performing the method |
| 02/13/1991 | CN2071189U Cast part age-box |
| 02/12/1991 | US4992309 Immersion of metal into nitriding bath |
| 02/12/1991 | US4992113 Process for heat treatment under a gaseous atmosphere containing nitrogen and hydrocarbon |
| 02/12/1991 | US4992112 Gripper, sluicer valve |
| 02/12/1991 | CA1280176C Method and apparatus for hardening axially spaced cams on a camshaft |
| 02/07/1991 | WO1991001386A1 Process for hardening the cutting edges of saws, knives and cutting tools |
| 02/07/1991 | DE3925467A1 Hardening of steel parts by heating and quenching - using glycerine or a glycol, esp. ethylene glycol, as quenching agent |
| 02/07/1991 | CA2064032A1 Process for hardening the cutting edges of saws, knives and cutting tools |
| 02/06/1991 | EP0411161A1 Method for thermal treatment of high-speed steel |
| 02/06/1991 | EP0411061A1 Fe-Mn-Al-C ALLOYS AND THEIR TREATMENT. |
| 02/06/1991 | EP0410969A1 Improvements in scanning induction hardening |
| 02/06/1991 | CN1049030A Process for hardening cutting edges of saws, blades and punching dies |
| 02/05/1991 | US4990736 Generating electromagnetic fields in a self regulating temperature heater by positioning of a current return bus |
| 02/05/1991 | US4990197 Heat treatment of rapidly quenched Fe-6.5 wt % Si ribbon |
| 01/30/1991 | EP0410501A1 Fluidized bed for quenching steel wire |
| 01/30/1991 | EP0410294A1 Method and apparatus for annealing metal strips |
| 01/29/1991 | US4988393 Method for producing high-strength steel having improved weldability |
| 01/27/1991 | CA2022042A1 Process and apparatus for the heat treatment of metal strip shuts |
| 01/24/1991 | WO1991000929A1 Process for case-hardening roller bearing components of low-alloy nickel steel |
| 01/23/1991 | EP0409687A1 Method of silicifying metallic parts by chemical vapour deposition |
| 01/23/1991 | CN2069862U Resistance-heated hydraulic tempering machine tool |
| 01/23/1991 | CN1048728A Agitator for atomosphere reforming in continuous heat-treating furnace |
| 01/23/1991 | CN1048727A Process for hyperthermal strengthening heat-treatment of molten ore or metal |
| 01/22/1991 | US4986857 Hot working and heat treatment of corrosion resistant steels |
| 01/20/1991 | CA2021305A1 Gaseous phase chemical coating silicification process for steel |
| 01/16/1991 | EP0408511A1 Process and apparatus for thermal or thermochemical treatment of steel |
| 01/16/1991 | EP0408325A1 Catalytic agitators for the modification of furnace atmospheres |
| 01/10/1991 | WO1991000018A1 Controlled atmosphere generating equipment |
| 01/10/1991 | DE4017734A1 Control of scanner system - for laser hardening plant to operate on the resonance frequency of the scanner |
| 01/09/1991 | EP0407349A2 Electrode for use in electrolytic processes and process for manufacturing it |
| 01/09/1991 | EP0407254A1 Process for thermal treating of metals |
| 01/09/1991 | EP0406638A1 Gamma Titanium aluminum alloys modified by chromium and tantalum and method of peparation |
| 01/09/1991 | EP0406237A1 Die-less drawing method and apparatus |
| 01/09/1991 | CN1048450A Salt-bath furnace with hidden and changeable electrodes |
| 01/08/1991 | US4983112 Interlocking device for hot isostatic pressurizing equipment |
| 01/08/1991 | CA1278681C Low pressure misting jet |
| 01/02/1991 | EP0406047A1 Process for heat-treating of metals |
| 01/02/1991 | EP0404898A1 Device for hardening the surfaces of workpieces of different lengths. |
| 01/02/1991 | CA1278443C Heat retaining means |
| 12/31/1990 | CA2020077A1 Metal thermal processing |
| 12/31/1990 | CA2018670A1 Metal substrate of improved surface morphology |
| 12/27/1990 | EP0404496A1 Heat treatment of metals |
| 12/27/1990 | EP0404430A2 Modular annealing apparatus for in situ reactor vessel annealing and related method of assembly |
| 12/27/1990 | EP0404314A1 Monitoring and control of reactor vessel heat treatment |
| 12/27/1990 | EP0404313A2 Electric resistance heater unit assembly |
| 12/27/1990 | EP0404310A2 Temperature monitoring device and thermocouple assembly therefor |
| 12/27/1990 | EP0404309A2 Heat treatment control |
| 12/27/1990 | EP0403756A1 Reactor vessel annealing system |
| 12/27/1990 | EP0403747A2 Heating equipment installation system and method |
| 12/22/1990 | CA2019565A1 Heat treatment of metals |
| 12/20/1990 | DE3934474A1 Increasing capacity of box annealing furnaces for coiled products - involves introducing scavenging gas during cooling phase to reduce cooling time and prevent oxidation of product surface |
| 12/20/1990 | DE3919536A1 Cardboard cutting tool - is hardened by HF in chamber filled with protective gas |
| 12/18/1990 | US4978109 Unitary construction multideck tray device for heat treatment of shafts or like members |
| 12/18/1990 | CA1277894C Annealing separator used in the finishing annealing step for producing a grain-oriented electrical steel sheet |
| 12/18/1990 | CA1277893C Shallow case hardening and corrosion inhibition process |
| 12/13/1990 | DE4017030A1 Wear and corrosion resistant valve seating ring for combustion engine |
| 12/12/1990 | EP0401726A1 Process for increasing the strength of heat-treatable steel and use of the steel obtained therefrom |
| 12/12/1990 | EP0401482A2 Wear resistant sintered alloy, especially for valve seats for internal combustion engines |
| 12/12/1990 | CN2067279U Transformer type inductor for high frequency quenching |
| 12/12/1990 | CN1047697A Method of producting narrow band steel having hardenability |
| 12/04/1990 | US4975335 Fe-Mn-Al-C based alloy articles and parts and their treatments |
| 12/04/1990 | CA1277214C Heat treatment process, hood used in said process, and role of the latter in heat treating ovens |
| 11/29/1990 | WO1990014743A1 Apparatus for and method of induction-hardening machine components |
| 11/29/1990 | DE3916684A1 Re-melting surface hardening process esp. for cam shaft or drag lever - has central and border regions heated at different times or using geometrical displacement to minimise surface deformation |
| 11/28/1990 | CN1047345A Heat treatment of corrosion resistant steels |
| 11/22/1990 | EP0398792A1 Apparatus for the positioning of equipment in a cylindric cavity having perforations arranged in a regular pattern |
| 11/22/1990 | EP0398105A2 Tunnel furnace |
| 11/22/1990 | EP0398104A1 Continuous furnace |
| 11/20/1990 | USRE33445 Method of quenching |
| 11/20/1990 | US4972061 Modifying the reflectivity of a surface |
| 11/20/1990 | US4971634 Method of carburizing spheroidizing and quenching |
| 11/17/1990 | WO1990014741A1 A plant for conductive electrical heating of steel blanks |
| 11/15/1990 | DE4001144C1 Case hardening of metallic workpiece - by rotating and locally heating above transformation temp. by energy beam |
| 11/15/1990 | DE3915275A1 Readily changeable hardening head for induction hardening machine - has inductor releasably clamped to support, clamping jaws attached to inductor base and compressed air directed to clean contact regions |
| 11/14/1990 | EP0396659A1 An endothermic gas generator |
| 11/13/1990 | US4970372 Furnace for the thermal treatment of iron and steel components |
| 11/13/1990 | US4969959 Methods for enhancing the thermal quenching of a metal surface |
| 11/13/1990 | CA1276095C Method for softening rolled medium carbon machine structural steels |
| 11/08/1990 | DE3914573A1 Localised flame treatment of surfaces to prevent damage - has cryogenic cooling medium e.g. argon, nitrogen or carbon di:oxide, applied either side of flame to limit thermal loading |
| 11/07/1990 | CN2065196U Oxidation-free annealer |