| Patents for C21C 7 - Treating molten ferrous alloys, e.g. steel, not covered by groups (11,430) |
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| 01/23/1991 | CN1011339B Charging material preheater for preheating charging material of metallurgical smelting unit |
| 01/16/1991 | EP0408165A1 Dispersing gas into molten metal |
| 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 |
| 01/15/1991 | US4984771 Heating system for steel casting ladles |
| 01/08/1991 | CA1278679C Solid particle accelerating tuyere adapter device |
| 12/25/1990 | US4979983 Process for vacuum degassing and decarbonization with temperature drop compensating feature |
| 12/25/1990 | US4979558 Process for preparation of a casting having MnS dispersed and uniformly and finely precipitated therein |
| 12/18/1990 | US4978108 Gas washing sink without integral closure member |
| 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 | 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 |
| 12/04/1990 | US4975335 Fe-Mn-Al-C based alloy articles and parts and their treatments |
| 12/04/1990 | CA1277138C Method of assembling a gas circulation block provided for 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 |
| 11/20/1990 | US4971622 Sulphur and silicon control in ferrochromium production |
| 11/20/1990 | US4971294 Induction heated sliding gate valve for vacuum melting furnace |
| 11/20/1990 | CA1276471C Process and lance for the production of a bath of molten metal or alloys |
| 11/15/1990 | WO1990013382A1 Treatment of melts in a ladle and apparatus for such treatment |
| 11/15/1990 | DE4014835A1 Oxidn. treatment of liq. metal baths to remove impurities - using oxidising flush gas contg. carbon di:oxide to control produced heat |
| 11/07/1990 | EP0396267A1 Method and apparatus for the treatment of molten metals |
| 11/07/1990 | CN1010324B Shell and tube composite material suitable for treatment of melten metal bath |
| 11/05/1990 | CA2015341A1 Method and apparatus for the treatment of molten metals |
| 11/01/1990 | WO1990012895A1 Gas injector |
| 10/31/1990 | EP0395138A1 Device for the purification of molten metal, in particular aluminium |
| 10/31/1990 | CN1046562A Process for manufacture of normal steels |
| 10/31/1990 | CN1046482A Process and apparatus for casting ingots of lead-containing steel |
| 10/31/1990 | CN1010222B Post-mix method and system for supply of powderized materials |
| 10/30/1990 | CA1275616C Powder filled tube and a method for the continuous manufacture of suchtube |
| 10/24/1990 | EP0393801A1 Method and device for casting lead bearing steel |
| 10/24/1990 | EP0393391A1 Method of refining molten chrome steel |
| 10/24/1990 | CN1010106B Improvements in apparatus for injecting substances into liquids |
| 10/17/1990 | EP0392239A1 Process for production of alloyed steels |
| 10/13/1990 | CA2014488A1 Method and apparatus for casting ingots of lead-alloy steel |
| 10/13/1990 | CA2014265A1 Process to produce alloy steel grades |
| 10/04/1990 | WO1990011384A1 Material for refining a general purpose steel |
| 10/03/1990 | CN1009837B Method for controlling secondary top-blown oxygen in subsurface pneumatic steel refining |
| 09/26/1990 | CN1045606A Products and process obtaining silicon-aluminium alloy from waste slog powder |
| 09/18/1990 | US4958358 Apparatus for the thermal treatment of a metallic melt |
| 09/18/1990 | US4957542 Dehydrogenation, decarbonization, nitriding |
| 09/18/1990 | CA1274064A1 Process and device for the production, in particular, of steel |
| 09/12/1990 | EP0233872B1 Method for the treatment of metals and alloys for the refining thereof |
| 09/11/1990 | US4956010 Composite tubes, desulfurized cast iron using sodium carbonate for desulfurization |
| 09/11/1990 | US4956009 Calcium alloy steel additive and method thereof |
| 09/07/1990 | WO1990010087A1 Process and device for handling metals in a vacuum |
| 09/05/1990 | EP0385617A1 Injecting gas into molten metal |
| 09/05/1990 | CN1045132A Method for manufacturing molten metal containing ni and cr |
| 09/05/1990 | CN1045128A Process and apparatus for treatment of metal in vacuum |
| 09/05/1990 | CN1045041A Method and apparatus for making clad core wire |
| 09/04/1990 | US4954167 Dispersing gas into molten metal |
| 08/29/1990 | EP0384397A1 Method for manufacturing molten metal containing Ni and Cr |
| 08/29/1990 | EP0258326B1 Device for degassing molten metals |
| 08/22/1990 | EP0383184A1 Method of decreasing the fume emission and the free entry of air in the tap hole region of a blast furnace |
| 08/22/1990 | EP0383093A2 Method for the pneumatic and dosed injection of pulverised material into a vessel, subjected to a variable pressure |
| 08/22/1990 | CN1009279B Method for smelting micro-carbon chrome iron by the top-bottom compound blow converter |
| 08/21/1990 | US4950325 Process for heating steel melts and an apparatus for carrying out the process |
| 08/21/1990 | US4950324 Tri-level method and apparatus for post melting treatment of molten steel |
| 08/21/1990 | CA1273044A1 Arc heating type extra-furnace refining apparatus |
| 08/17/1990 | CA2010235A1 Injecting gas into molten metal |
| 08/15/1990 | CN1044677A Method of deoxidizing and alloying steel |
| 08/15/1990 | CN1009208B Injection of substances into high temp. liquids |
| 08/14/1990 | US4948423 Vacuum induction melting in high density, high purity graphite crucible |
| 08/14/1990 | US4948364 Lime kilns |
| 08/14/1990 | CA2010040A1 Process for reducing dust emission and free air access in the tapping region of a blast furnace |
| 08/09/1990 | DE3911881C1 Fired gas flushing brick - for decarburisation of molten steel in vacuum vessel, comprises ceramic parallel tube lets |
| 08/01/1990 | CN1008983B Powder delivering device for rare-earth alloys by injection method |
| 07/31/1990 | US4944799 Method of producing stainless molten steel by smelting reduction |
| 07/31/1990 | US4944798 Method of manufacturing clean steel |
| 07/31/1990 | US4944496 Apparatus for injecting gas into high temperature liquids, e.g. molten metals |
| 07/26/1990 | WO1990008200A1 Metallurgical vessel and arrangement of the same |
| 07/25/1990 | EP0378744A1 Method and apparatus for adding shot to molten steel |
| 07/25/1990 | CN1044127A Dephosphorising and vanadium-main taining process of pig iron containing vanadium in electrical arc furnace |
| 07/25/1990 | CN1044055A Casting ingots of killed and plugged steel of carbonless pwtection slag |
| 07/18/1990 | EP0377597A1 Process and device for minimizing process gas consumption in metallurgical processes |
| 07/18/1990 | CN1008798B Exothermic, slag trapping and insulating covering agent |
| 07/18/1990 | CN1008797B Slagging heat-insulating covering agent |
| 07/17/1990 | US4941914 Desulfurization agent |
| 07/17/1990 | US4941913 Process for heating steel melts as well as device for performing this process |
| 07/11/1990 | CN1043749A Method for charging rare-earth oxide dregs into cupola furnace |
| 07/10/1990 | US4940214 Apparatus for generating a vortex in a melt |
| 07/05/1990 | DE3844273A1 Melting and casting installation |
| 07/04/1990 | EP0376523A1 Purifying molten metal |
| 07/04/1990 | EP0376142A1 Gas-flushing installation |
| 06/28/1990 | DE3905198C1 Process for forming an alloy compact, and alloy compact |
| 06/27/1990 | CN1043345A Compound deoxidant and preparing process thereof |
| 06/27/1990 | CN1008541B Improvements in nozzles for injecting substances into liquids |
| 06/26/1990 | US4936373 Uniformity and tensile strength |
| 06/26/1990 | CA1270917A1 Method and apparatus for detecting slag in a flowing molten metal |
| 06/22/1990 | CA2006112A1 Injection device |
| 06/20/1990 | CN1043162A Cast iron strong graphited inoculant |
| 06/19/1990 | CA1270503A1 Ladle furnace |
| 06/13/1990 | CN1008378B Injection tube for fibred material |
| 06/06/1990 | EP0371382A1 Chemical dehydrogenation of molten ferrous alloys using a halogen-containing compound |
| 06/06/1990 | CN1042735A Method of producing general-purpose steel |
| 06/05/1990 | US4931090 Pneumatic steelmaking vessel and method of producing steel |
| 06/05/1990 | US4930986 Apparatus for immersing solids into fluids and moving fluids in a linear direction |
| 06/05/1990 | US4930547 Powder-filled welded steel tube and method for the continuous manufacture thereof |