Basic Tundish Flux Composition For Steelmaking Processes
Tundish fluxing processNational Steel Corporation
Basic tundish flux composition for steelmaking processes Barker 75/323 Basic tundish flux composition for steelmaking processes Barker 75/560 Decreasing contamination of molten metal prior to solidification casting Melville et al 164/472 Casting flux Janke et
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Tundish MetallurgyIspatGuru
Tundish Metallurgy To transfer liquid steel from a teeming ladle to the continuous casting machine mould an intermediate vessel called a tundish is used Tundish is a rectangular big end up refractory lined vessel which may have a refractory lined lid on the top The tundish bottom has one or more nozzle port s with slide gate s or
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China Basic Tundish Flux For Steelmaking Processes
Basic Tundish Flux For Steelmaking Processes The tundish flux composition employs solid recycled ladle metallurgy furnace LMF slag as a fluidizing and refining base ingredient in a mixture of raw materials The flux compositions for protecting and further refining molten steel in a tundish
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Basic oxygen furnace based steelmaking processes and
DOI 10 1179/X80127 Corpus ID Basic oxygen furnace based steelmaking processes and cleanliness control at Baosteel article Zhang2006BasicOF title= Basic oxygen furnace based steelmaking processes and cleanliness control at Baosteel author= L Zhang and J Zhi and F Mei and L Zhu and X Jiang and J Shen and J Cui and Kai ke Cai and B Thomas
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Tundish fluxing processNational Steel Corporation
As previously stated however the conventional practice has been to use a single flux to provide a substantially uniform coating over the surface of the molten steel throughout the tundish or in the so called double layer flux practice a first flux composition is used to provide a liquid layer over the entire steel surface and a second layer generally consisting of a highly siliceous rice hull ash covering the liquid flux
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An Overview of Steel Cleanliness From an Industry
1 Argon purging or vacuum systems at the steel transfer points ladle to tundish tundish to mold 30 2 31 33 81Extensive water and CFD modeling of metal flow in the tundish 3 34 35Refractory furniture and impact pad systems 4 4 36 37 80Tundish refractory materials tundish covers and basic tundish slags to minimize sources of oxygen
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Stainless Steel Slag FundamentalsFrom Furnace to
In stainless steelmaking the major oxidation products are SiO2 and Cr2O3 The SiO2 is a fluxing component while the Cr2O3 is a very potent refractory component which stiffens the slag With stainless steel slags the Cr O buffer occurs at a much lower oxygen potential than the Fe O buffer and Cr will be preferentially oxidized compared to Fe
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steelBasic oxygen steelmaking Britannica
2 days ago steelsteelBasic oxygen steelmaking More than half the world s steel is produced in the basic oxygen process BOP which uses pure oxygen to convert a charge of liquid blast furnace iron and scrap into steel The basic oxygen furnace BOF is a refractory lined tiltable converter into which a vertically movable water cooled lance is inserted to blow oxygen through nozzles at
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Basic oxygen furnace based steelmaking processes and
Basic oxygen furnace based steelmaking processes and cleanliness control at Baosteel L Zhang 1 J Zhi2 F Mei2 L Zhu2 X Jiang2 J Shen2 J Cui2 K Cai3 and B G Thomas4 Optical microscopy total oxygen measurements and slime tests have been conducted to quantify
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Basic flux CaO Al2O3 SiO2 based is theoretically better than burnt rice husk at refining LCAK steels and has been correlated with lower O2 in the tundish Use of basic tundish flux CaO 40 Al2O3 24 MgO 18 SiO2 5 Fe2O3 0 5 and C 8 together with baffles significantly lowers the total O2 fluctuation as compared to the flux CaO 3 Al2O3 10 to 15 MgO 3 SiO2 65
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NEW Patent CD for Basic tundish flux composition for
Amazon NEW Patent CD for Basic tundish flux composition for steelmaking processes Other Products Everything Else
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METALLURGICAL USES FLUXES FOR METALLURGY
Moore 1981 Szekely et al 1989 In ironmaking and steelmaking slags are basic and the primary flux added is lime bearing although some acidic components are sometimes added In nonferrous pro cesses slags and fluxes are acidic with silica as the primary com ponent and although the use of basic flux such as limestone or lime
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Designing a New Scrap Based Continuous Steelmaking
Continuous steelmaking has the potential to use energy more efficiently lower production costs lessen environmental impact and increase steel quality and consistency Many different continuous steelmaking processes have been proposed in the last 40 years 1 2 Some of these processes even reached the pilot plant
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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 chemically engineered tundish flux mixture The designed mixture combines the recycled LMF slag and raw materials in a powdered product for application to the surface of molten steel contained within the tundish
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Steelmaking Processan overview ScienceDirect Topics
During the steelmaking process fluxes that consist of lime CaO or dolomitic lime with iron and scraps are charged to the furnace There is a certain amount of free lime f CaO in steel slag Free lime with a specific gravity of 3 34 can react with water to produce Ca OH 2 with a specific gravity of 2 23 which results in volume increase Fig 9 1
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Tundish Powders Through its Metallurgica Product Line Vesuvius offers mould powders and covering compounds for tundish application With extensive experience and knowledge of the continuous casting process Metallurgica R D team ensures ideally customised top quality and reliable products For tundish covering compounds Metallurgica offers
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Tundishan overview ScienceDirect Topics
Seppo Louhenkilpi in Treatise on Process Metallurgy Industrial Processes 2014 1 8 3 1 Tundish The main functions of the tundish are to be a steel reservoir between the ladle and the mold and in the case of multistrand casters to distribute the liquid into the molds The first item is of special importance during ladle change In addition to being a reservoir of liquid steel the tundish
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steelPrimary steelmaking Britannica
steelsteelPrimary steelmaking In principle steelmaking is a melting purifying and alloying process carried out at approximately 1 600° C 2 900° F in molten conditions Various chemical reactions are initiated either in sequence or simultaneously in order to arrive at specified chemical compositions and temperatures Indeed many of the reactions interfere with one another
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2K Iron and Steelmaking Processes and Refractories
Their basic composition comprises chemically stable substances such as magnesia alumina and silica which do not easily react with steel slags or fluxes When binders are mixed with these refractories the mixture when used as it is is called a monolithic refractory when pressurized compacted and fired it is called firebrick
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terials iron ore coal coke etc and the flux that is added in the steelmaking refining process for removal of impurities Si P S etc and composition adjustment The yield of iron/steel slag is about 300 kg/t p per ton of pig iron for blast furnace slag and about kg/t s per ton of molten steel for steelmaking slag In Japan
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Tundish Technology for Casting Clean Steel A Review
Tundish is also the last vessel in which metal flows before solidifying in mold For controlling the quality of steel flow and temperature control of the melt are critical and these are presented in this paper Use of proper flux design of flow control devices and gas injection in tundish become important factors in casting clean steel
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An Overview of Steel Cleanliness From an Industry
1 Argon purging or vacuum systems at the steel transfer points ladle to tundish tundish to mold 30 2 31 33 81Extensive water and CFD modeling of metal flow in the tundish 3 34 35Refractory furniture and impact pad systems 4 4 36 37 80Tundish refractory materials tundish covers and basic tundish slags to minimize sources of oxygen
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Steel Cleanliness and Clean Steel TechnologiesIspatGuru
Tundish fluxThe tundish flux is to carry out many functions Firstly it is to insulate the liquid steel both thermally to prevent excessive heat loss and chemically to prevent air entrainment and reoxidation Further the tundish flux with lower SiO2 content can decrease N2 pick up from the ladle to the mould substantially
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composition governed by time dependent thermodynamics Some liquid flux resolidifies against the cold mold wall creating a solid flux rim which inhibits heat transfer at the meniscus Other flux is consumed into the gap between the shall and mold by the downward motion of the steel
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20 The flux composition of claim 18 wherein the mixture includes low melting point fluxing materials that include combined gas 21 The flux composition of claim 20 wherein the combined gas is carbon dioxide 22 A basic flux composition for use in covering liquid metal in a tundish comprising in percent by weight
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Steel Production Technology Metallurgy for Dummies
Steelmaking technology has greatly changed during the last two decades under the pressure of increased demand new specifications and the need to reduce energy and material consumption Steelmaking Production Production efficiency has been improved by increasing the melt capacity of furnaces implementing on line computer control modules and introducing new technologies such as
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Tundish and its role in Continuous CastingIspatGuru
Tundish and its role in Continuous Casting satyendra September 28 2013 2 Comments continuous casting dam Refractory Spray lining Tundish weir Tundish and its role in Continuous Casting Continuous casting of steel is a widely used process and an important step in
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Steel Production Technology Metallurgy for Dummies
Steelmaking technology has greatly changed during the last two decades under the pressure of increased demand new specifications and the need to reduce energy and material consumption Steelmaking Production Production efficiency has been improved by increasing the melt capacity of furnaces implementing on line computer control modules and introducing new technologies such as
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PDF Basic Tundish Powder Evaluation for Continuous
Since heat transfer through a completely liquid layer is rapid tundish flux requires an outer solid particulate layer A layer of liquid in contact with the molten steel is necessary to protect the molten steel from atmospheric oxidation and also to absorb inclusions that reach the flux metal interface8
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The tundish flux composition comprises from about 10 to about 80 of recycled LMF slag with the balance being raw materials selected from a calcium oxide source a fluorine source a magnesium
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Steelmaking Dept Kawasaki Steel Corp Kurashiki JAPAN
Steelmaking Dept Kawasaki Steel Corp Kurashiki JAPAN of the chemical composition the tundish flux on cleanliness molten steel in at S2 with the higher basic Flux C is 6 to 16ppm lower than that with the low basicity Flux A The casting was carried out under the conditions in Table 1 and small size slabs
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Basic oxygen furnace based steelmaking processes and
Plant experience found that MgO–SiO2–Al2O3 basedbasic tundish flux tended to freeze owing to its highmelting point 1400uC This made it difficult toabsorb inclusions and also could not effectively preventair absorption Instead CaO–SiO2–Al2O3based fluxeswere developed The effect of the CaO/SiO2ratio oncastability and steel cleanliness has been investigated The main characteristics of the fluxes are given inTable 5 The molten steel temperature and TO in thetundish during IF steel casting are shown in Fig 19 Thesteel temperature during a ladle exchange period wasmore steady and lower TO was achieved when the fluxcontained CaO/SiO2 4 compared with CaO/SiO2 2 addition less erosion of the tundish and SENrefractory lining was found for the tundish flux
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5 The composition of claims 1 2 3 or 4 consisting essentially of about 50 wt lime 35 wt calcium aluminate and 15 wt bauxite 6 A steelmaking additive composition consisting essentially of from about 40 to 70 wt CaO 20 to 50 wt Al 2 O 3 from bauxite or mixtures of calcium aluminate and bauxite and 0 to 30 wt MgO 7
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DOI 10 1179/X80127 Corpus ID Basic oxygen furnace based steelmaking processes and cleanliness control at Baosteel article Zhang2006BasicOF title= Basic oxygen furnace based steelmaking processes and cleanliness control at Baosteel author= L Zhang and J Zhi and F Mei and L Zhu and X Jiang and J Shen and J Cui and Kai ke Cai and B Thomas
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Novel Application of Alkali Oxides in Basic Tundish Fluxes
Fundamental work on the effect of alkali oxides including Li2O Na2O and K2O on the absorption ability of inclusions in a typical basic tundish flux for 321 stainless steels has been studied The effects on the absorption ability are dependent on the type of alkali oxides and the amount composed within the tundish flux Results from kinetics studies using an induction furnace at 1823 K 1550
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