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| Number | Title | Issue Date |
| 7959709 | Method of producing steel for steel pipe excellent in sour-resistance performance A method of producing steel pipe excellent in sour-resistance performance, uses comprises controlling the amount of Ca addition charged into molten steel in a ladle according to a N content in the molten steel prior to Ca addition. As a result of the controlling ste... | 06/14/2011 |
| 7635406 | Method for manufacturing a low alloy steel excellent in corrosion resistance A low alloy steel, which has a chemical composition by mass %, of C: 0.1 to 0.55%, Si: 0.05 to 0.5%, Mn: 0.1 to 1%, S: 0.0001 to 0.005%, Al: 0.005 to 0.08%, Ti: 0.005 to 0.05%, Cr: 0.1 to 1.5%, Mo: 0.1 to 1%, O: 0.0004 to 0.005%, Ca: 0.0005 to 0.0045%, Nb: 0 to 0.1%... | 12/22/2009 |
| 7615099 | Method for producing high cleanness steel excellent in fatigue strength or cold workability The present invention relates to a high-cleanliness steel having a high fatigue strength and high cold workability, and a method of making the high-cleanliness steel. The method adds a Li—Si alloy having a Li content between 20 and 40% and/or Li2CO... | 11/10/2009 |
| 7608130 | Method for producing high cleanliness steel excellent in fatigue strength or cold workability The present invention relates to a high-cleanliness steel having a high fatigue strength and high cold workability, and a method of making the high-cleanliness steel. The method adds a Li—Si alloy having a Li content between 20 and 40% and/or Li2CO... | 10/27/2009 |
| 6547849 | Ladle refining of steel A steel charge and slag forming material is heated in a ladle to form molten steel covered by a slag containing silicon, manganese and calcium oxides. The steel is stirred by injection of an inert gas such as argon or nitrogen to cause silicon/manganese-d... | 04/15/2003 |
| 6375711 | Steelmaking using magnesium carbonate The present invention provides methods and compositions for steelmaking using magnesium carbonate to create a foaming primary slag.... | 04/23/2002 |
| 6372013 | Carrier material and desulfurization agent for desulfurizing iron A particulate carrier material for use with particulate passivated magnesium for injection into molten iron to desulfurize the iron, improve characteristics of the slag and increase iron yield. Material flow of a transport gas and the carrier material is ... | 04/16/2002 |
| 6355089 | Process for the manufacture of carbon or low-alloy steel with improved machinability A carbon or low-alloy steel is provided with improved machinability. The carbon content of the steel is less than 1.5% and the sum of the alloy elements contained therein is less than 9%. The steel contains oxide and sulfide inclusions, and the chemical c... | 03/12/2002 |
| 6238633 | Process for preparing calcium aluminate from aluminum dross A non-metallic product (NMP) substantially free of metallic aluminum and aluminum nitride which is utilized for making calcium aluminate.... | 05/29/2001 |
| 6228137 | Process for producing a foaming slag above a stainless steel melted in an electric furnace A process for producing a foaming slag above a stainless steel melted in an electric furnace, in which: a powder containing at least one metal oxide and carbon in its composition is introduced into the slag, at least one oxide present in the powder is reduced ... | 05/08/2001 |
| 6174347 | Basic tundish flux composition for steelmaking processes The tundish flux composition of the invention employs solid recycled ladle metallurgy furnace (LMF) slag as a fluidizing and refining base ingredient in a mixture of raw materials. The preferred recycled LMF slag material comprises about 35% to about 65% ... | 01/16/2001 |
| 6051049 | Utilization of strontium aluminate in steelmaking Novel utilizations of strontium aluminate, a by-product of the manufacture of strontium, are disclosed in connection with the art of steelmaking. It is useful as a synthetic slag covering for molten iron or steel, as well as in the foaming slag practice, ... | 04/18/2000 |
| 5667555 | Method for the removal of calcium by products during the production of an iron feedstock A method for the removal of calcium byproducts created during the production of an iron-based feedstock suitable for use as the feedstock for steel mills, from industrial waste streams containing iron, by treating the waste stream with an ammonium chlorid... | 09/16/1997 |
| 5567222 | Method of controlling slag coating of a steel converter A method of controlling slag coating in a steel converter in which slag is left in the converter after tapping, and a slag solidifying agent is added to the slag to form a coated slag which is used to coat the bottom and/or side wall surface of the conver... | 10/22/1996 |
| 5407459 | Process for the preparation of calcium aluminates from aluminum dross residues The present invention is concerned with a process for the preparation of sintered calcium aluminates that can generally be used as a protective cover for liquid metals, and particularly steel, and the process comprising the steps of mixing calcium oxide, ... | 04/18/1995 |
| 5284617 | Process for dealuminizing molten cast iron Dealuminizing cast iron by contacting it with free-flowing flux particles having a solid silica core and a molten silica shell wherein said flux comprises silica and about 1% to about 5% calcium fluoride.... | 02/08/1994 |
| 5201941 | Process for introducing additive substances which are capable of flow into a metallurgical vessel and a vessel for that process For the metallurgical treatment of a molten metal bath (1) in a metallurgical smelting and refining vessel (3), additive substances (43) which are capable of flow, in particular lime, are supplied in a granular to dust state, at least during a part of the... | 04/13/1993 |
| 5106412 | Method for providing steel with lowered hydrogen level after ladle treatment A method is provided for obtaining steel with lowered hydrogen levels after ladle treatment. The method includes covering molten steel in the ladle with a particulate mixture consisting essentially of calcium aluminate and dolomitic limestone. The mixture... | 04/21/1992 |
| 5007958 | Lime-based injection powder for steel-refining A lime-based injection powder for use in steel-refining, having excellent waterproofing and desulphurization effects, consists of (a) more than 65% by weight of calcium oxide, (b) less than 30% by weight of fluorite, and 5-10% by weight of Al powder, 5%-7... | 04/16/1991 |
| 4999053 | Method of producing an iron-, cobalt- and nickel-base alloy having low contents of sulphur, oxygen and nitrogen A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of: (a) holding a molten alloy ... | 03/12/1991 |
| 4874428 | Fluidizing a lime-silica slag A method of fluidizing a cold lime-silica slag covering a molten metal. An acid flux is prepared from a particulate admixture of sodium fluoroaluminate and sodium silicate. The flux is mixed with the cold slag forming a fluid slag having at least 1% by we... | 10/17/1989 |
| 4853034 | Method of ladle desulfurizing molten steel A method for desulfurizing molten steel in a ladle employs high MgO content calcium-aluminate synthetic slag. A preferred slag composition contains 0.1-3.0% by weight of vanadium oxide. A particularly preferred composition is the slag obtained from the pr... | 08/01/1989 |
| 4753676 | Method of desulfurizing iron Iron is desulfurized with a compacted article composed of calcium carbide and a gas-generating solid whereby the article is disintegrated during desulfurization resulting in a substantial total consumption of the carbide and a resultant decrease of residu... | 06/28/1988 |
| 4744822 | Process for continuous purification of hot metal A process for the continuous treatment of hot metal as it is running from the blast furnace, in order to enable low phosphorus and sulphur levels to be attained simply and cheaply, so that the metal thus treated is suitable for subsequent use in the conve... | 05/17/1988 |
| 4729787 | Method of producing an iron; cobalt and nickel base alloy having low contents of sulphur, oxygen and nitrogen A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of: (a) holding a molten alloy ... | 03/08/1988 |
| 4705561 | Magnesium calcium oxide composite A product and method of manufacture are set forth. The product is used in desulfurizing steel. Magnesium is in its molten state, and with vigorous stirring, lime is added. A relatively brittle material is obtained upon cooling which can be ground to a par... | 11/10/1987 |
| 4600434 | Process for desulfurization of ferrous metal melts A process for magnesium desulfurization of ferrous metal melts in a vessel comprising the provision of a fluid, high sulfur capacity slag wherein the weight ratio of slag constituents associated with sulfur to slag constituents associated with oxygen is g... | 07/15/1986 |
| 4586956 | Method and agents for producing clean steel A method for producing exceptionally clean steel wherein desulphurization agents are added to the tap ladle during the first one-third volume of steel tapped and then adding a reduced amount of a deoxidizing agent and then adding slag conditioner agents w... | 05/06/1986 |
| 4570692 | Methods of pouring metal A method of pouring metal to provide improved physical properties is provided including the steps of: (a) pouring the metal through a generally vertical consumable tube extending from a pouring source to a point submerged beneath the surface of a molten p... | 02/18/1986 |
| 4528035 | Composition and process to create foaming slag cover for molten steel Slag formed in steel melt operations is foamed to create a protective cover using a composition comprised essentially of calcium oxide.... | 07/09/1985 |
| 4396425 | Addition agent for adding vanadium to iron base alloys Addition of vanadium to molten iron-base alloys using an agglomerated mixture of V2 O3 and calcium-bearing reducing agent.... | 08/02/1983 |
| 4318822 | Production of agent for desulfurizing crude iron and steel melts The invention relates to the production of an agent for desulfurizing crude iron and steel melts, the desulfurizing agent being based on calcium carbide containing calcium oxide. To this end, a calcium carbide/calcium oxide/starting melt mixture with a Ca... | 03/09/1982 |
| 4317678 | Process for continuous casting of aluminum-deoxidized steel Calcium or a calcium-bearing material is added to an aluminum-deoxidized steel in an amount which is sufficient to establish a calcium concentration exceeding the aluminum content by a value greater than about 0.14.... | 03/02/1982 |
| 4280837 | Method for continuously casting slab for manufacturing grain-oriented electrical steel sheet and strip In the continuous casting of slabs for use in manufacturing grain-oriented electrical steel sheet and strip, the slag covering the molten steel for casting the slabs is adjusted in its composition to maintain the ratio of Al2 O3 to S... | 07/28/1981 |
| 4233064 | Method of scavenging steel The present invention relates to a more efficient method for adding lighter-than steel, low solubility, volatile, active scavenging agents into molten steel that reduces or eliminates the smoke that accompanies other methods of adding these agents.... | 11/11/1980 |
| 4205980 | Process for removing sulphur from crude iron A process for removing sulphur from crude iron, comprising: bringing an adjusted flow of crude iron at a high temperature into contact with CaO by bringing the crude iron to flow through a bed of granules of CaO-containing material of about the same temperatur... | 06/03/1980 |
| 4072505 | Method of slagging molten metal A method of slagging off slag, especially treatment slag, from metal baths, particularly iron baths, in vessels such as crucibles and ladles, by means of a rabble while the vessel is slightly tilted. To this end, a slag-free zone starting at the lifted si... | 02/07/1978 |
| 4066446 | Thermally bloated fireclay (SCR verilite) ladle insulation The exposed surface of a molten metal, particularly iron and steel, is protected by a thermally insulating layer of finely divided particles of thermally bloated fireclay.... | 01/03/1978 |
| 4060406 | Arc steelmaking The invention provides a slag conditioner for use in electric arc steelmaking which comprises 30 to 80% by weight of alumina, 10 to 30% by weight of aluminium 5 to 40% by weight fluorspar and 0 to 20% by weight of alkali metal carbonate. The conditioner i... | 11/29/1977 |
| 4014685 | Manufacture of steel The invention is concerned with the desulphurizing of molten steel by the use of a lime-based flux. In addition to lime the flux includes sodium carbonate, an alkali metal or alkaline earth metal fluoride, typically fluorspar, alumina and a metallic reduc... | 03/29/1977 |
