| Patents for C21C 5 - Manufacture of carbon steel, e.g. plain mild steel, medium carbon steel, or cast-steel (14,381) |
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| 04/02/1991 | US5004496 Smelting with reducing agent and flux in gastight electrothermic furnace, tapping to remove slag and metal, oxidizing gas in afterburner, cooling |
| 04/02/1991 | CA1282229C Apparatus for mounting a siphon type converter tap hole pipe onto a converter vessel |
| 03/30/1991 | WO1991005214A1 Top submerged injection with a shrouded lance |
| 03/29/1991 | CA2026408A1 Method and apparatus for loading an oven with materials, and for preheating said materials |
| 03/27/1991 | EP0418656A1 Process and installation for intermittant simultaneous addition of gases and fine-grained solids into a melt |
| 03/26/1991 | US5002263 Compact lance |
| 03/21/1991 | WO1991003575A1 Integrated metallurgical reactor |
| 03/21/1991 | CA2024938A1 Process and apparatus for at least at times simultaneously supplying a molten metal with a gas and fine-grain solid materials |
| 03/20/1991 | EP0417898A1 Gunning composition |
| 03/20/1991 | EP0417296A1 Direct smelting process |
| 03/19/1991 | US5000427 Injection material for use in blast furnace |
| 03/19/1991 | US5000425 Method of preheating scrap |
| 03/13/1991 | CN1011981B Process for continuously melting of steel |
| 03/12/1991 | CA1281355C Floor of electrically heated melting furnace, particularly a direct current furnace |
| 03/06/1991 | EP0277232B1 Tuyere for torch guniting of metallurgical plant |
| 03/06/1991 | CN1049684A Water recovery process and utilization of sludge in dust removed from steel-smelting converting furnace |
| 02/27/1991 | EP0414308A1 Tap hole construction of a metallurgical vessel, method of renewing it and brick for use with it |
| 02/27/1991 | EP0413925A1 Air cooling system for a metallurgical vessel resting in a trunnion ring |
| 02/27/1991 | EP0413894A1 Pneumatic steelmaking vessel and method of producing steel |
| 02/26/1991 | US4996402 Method and apparatus for continuously melting material by induction heating |
| 02/26/1991 | US4995596 Apparatus for repairing a perforated brick in a metallurgical vessel |
| 02/26/1991 | US4995594 Slag stopping plug for tap holes of metal furnaces containing molten material |
| 02/26/1991 | US4995270 Molten metal sampling |
| 02/19/1991 | US4995051 Smelting furnace and method for feeding material to be processed therein |
| 02/19/1991 | US4993691 Oxygen injection lance |
| 02/19/1991 | US4993689 Convertor for continuously melting scrap with tapping means |
| 02/19/1991 | CA1280288C2 Multi-purpose pyrometallurgical process enhancing device |
| 02/14/1991 | DE3926144A1 Easily replaced tapping pipe for metal melt in converter - has removable inner pipe coated with heat resistant lubricant, and outer pipe with air gap between |
| 02/12/1991 | US4991825 Gases into metallurgical vessels |
| 02/10/1991 | WO1991002095A1 Arrangement for introducing waste material into a molten slag |
| 02/10/1991 | CA2037905A1 Arrangement for introducing waste material into a molten slag |
| 02/05/1991 | US4989843 Retaining structure for refractory lining in high temperature vessel |
| 02/05/1991 | US4989839 Automatic tuyere puncher |
| 02/05/1991 | US4989838 Metallurgical treatment lance |
| 01/30/1991 | EP0409980A1 Tuyere for torch guniting of metallurgical plant |
| 01/24/1991 | DE3938687A1 Slag stopper for converter |
| 01/23/1991 | EP0271580B1 Method of torch guniting of metallurgical plant |
| 01/23/1991 | CN1011376B Directional electric arc heating device |
| 01/23/1991 | CN1011339B Charging material preheater for preheating charging material of metallurgical smelting unit |
| 01/22/1991 | US4986847 Efficient supplying |
| 01/16/1991 | EP0408190A1 Steelmaking process |
| 01/16/1991 | EP0407845A1 Installation for preventing respectively decreasing flush slag entering into the spout of a converter |
| 01/16/1991 | EP0407535A1 Metallurgical vessel and arrangement of the same. |
| 01/16/1991 | CN1048563A Compound blow-double flow duct oxygen gun to smelt semisteel technology |
| 01/16/1991 | CN1048562A Double flow compound top blown steel making process and the oxygen gun thereof |
| 01/15/1991 | US4984771 Heating system for steel casting ladles |
| 01/15/1991 | US4984769 Tap spout for metallurgical vessels and method of repairing |
| 01/10/1991 | DE3922095A1 Prodn. of liq. steel - from liq. iron oxide formed by treating metallic foam with high oil content etc., by mixing with pig iron |
| 01/10/1991 | DE3921807A1 Verfahren und vorrichtung zum beheizen eines metallurgischen ofens Method and apparatus for heating a metallurgical furnace |
| 01/09/1991 | WO1991000928A1 Method of dephosphorizing chromium-containing hot metal with lowered oxidation loss of chromium |
| 01/08/1991 | CA1278679C Solid particle accelerating tuyere adapter device |
| 01/04/1991 | WO1991000366A1 Process and device for heating a metallurgical furnace |
| 01/04/1991 | CA2063711A1 Method and apparatus for heating a metallurgical furnace |
| 01/03/1991 | DE4005004A1 Increasing durability of linings, esp. converter linings - by spraying molten slag heel over lining |
| 01/02/1991 | EP0404815A1 Method and installation for recovering energy in metallurgical processes. |
| 01/02/1991 | CN1011044B Infrared process of smelting of low carbon, low-alloy steel by electric furnace |
| 01/01/1991 | US4982411 Wall electrode for direct current powered electric arc furnace |
| 01/01/1991 | US4981285 Gas-fired steelmelting apparatus |
| 12/19/1990 | CN1047886A Process of controlling slag in top-blowing steelmaking converter |
| 12/18/1990 | US4978108 Gas washing sink without integral closure member |
| 12/18/1990 | US4978105 Steel mill system which includes a metallurgical furnace and a further processing system |
| 12/13/1990 | WO1990015165A1 Manufacture of ferroalloys using a molten bath reactor |
| 12/13/1990 | WO1990015160A1 Treatment of a melt with a gas and means therefor |
| 12/12/1990 | EP0402344A1 Slag controlling process in a steelmaking blast converter |
| 12/12/1990 | EP0401530A2 Process for decarburising chromium containing steel melts with over 10% chromium |
| 12/12/1990 | EP0273947B1 Improvements in nozzles for injecting substances into liquids |
| 12/12/1990 | CN1047704A Manufacture of ferro alloy by molten bath reactor |
| 12/11/1990 | CA1277486C Method and installation for the maintenance of an oven's lining |
| 12/10/1990 | WO1990015161A1 Device for removing worn nozzle bricks or nozzle linings from metallurgical vessels |
| 12/10/1990 | CA2033185A1 Device for removing worn nozzle bricks or nozzle linings from metallurgical vessels |
| 11/28/1990 | CN1047344A Method for producing stainless molten steel by smelting reduction |
| 11/22/1990 | DE3916257A1 Metallurgical processing converter esp. for scrap material - has tiltable vessel with gas-injection nozzles located in base opposite asymmetrically positioned charging mouth |
| 11/21/1990 | CN1047109A Process for smelting reduction of cr materials, and smelting reduction furnace therefor |
| 11/20/1990 | US4971622 Sulphur and silicon control in ferrochromium production |
| 11/20/1990 | US4971297 Nozzle for refining lance |
| 11/20/1990 | US4971294 Induction heated sliding gate valve for vacuum melting furnace |
| 11/14/1990 | EP0397565A1 Method for separation of inclusions in metals by remelting |
| 11/14/1990 | EP0396717A1 Automatic lance-exchanging device. |
| 11/07/1990 | EP0396267A1 Method and apparatus for the treatment of molten metals |
| 11/06/1990 | US4969035 Observation of furnace interior |
| 11/05/1990 | CA2015341A1 Method and apparatus for the treatment of molten metals |
| 11/01/1990 | WO1990012895A1 Gas injector |
| 11/01/1990 | WO1990012894A1 Gunite burner for torch-guniting of metallurgical plants |
| 10/31/1990 | EP0395138A1 Device for the purification of molten metal, in particular aluminium |
| 10/31/1990 | EP0394455A1 Process for producing iron-boron-silicon alloy |
| 10/31/1990 | DE3926786C1 Gas injection in molten metal - using injection pipe in refractory lining of arc furnace vessel, etc. |
| 10/31/1990 | CN1046562A Process for manufacture of normal steels |
| 10/31/1990 | CN1010193B Protecting dregs made of residue of boron as the main component for steel smelt-pouring |
| 10/30/1990 | CA1275674C Method for regulating the electrodes in a furnace having freely burning electric arcs |
| 10/24/1990 | EP0393391A1 Method of refining molten chrome steel |
| 10/24/1990 | CN1010106B Improvements in apparatus for injecting substances into liquids |
| 10/23/1990 | US4965813 Combustion aiding apparatus for steel-making electric-arc-furnace |
| 10/18/1990 | WO1990012122A1 Method for superficial treatment of high temperature resistance tubes and tubes so treated |
| 10/18/1990 | WO1990010086A3 Melting aggregate with shaft for preheating charged materials |
| 10/17/1990 | EP0392239A1 Process for production of alloyed steels |
| 10/17/1990 | CN1046191A Process for raising vanadium, chromium recovery ratio by use of single-slag method for smelting high-speed tool steel |
| 10/17/1990 | CN1046190A Process for raising chromium recovery ratio by use of high-carbon chrome iron for smelting stainless steel |
| 10/13/1990 | CA2014265A1 Process to produce alloy steel grades |
| 10/09/1990 | US4961784 Blowing inert gas from bottom and side and oxygen from top to decarburize reduced ores |
| 10/09/1990 | CA1274990A1 Apparatus for temperature measurement in a converter |