Fusing agent additive for manufacturing ultra-low phosphoretic steel with outside-stove refining dephosphorization and its manufacturing method

The invention relates to a method for controlling phosphorus in the production of ultra-low phosphorous steel by microalloy steel, high carbon steel and special steel, in particular to a flux additive for producing the ultra-low phosphorous steel by external refining dephosphorization and a preparation method thereof. The flux additive is prepared by mixing raw materials according to a formula and respectively taking dephosphorizing flux, calcium fluoride, calcium carbonate or magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate, calcium oxide or magnesium oxide or a mixture of the calcium oxide and the magnesium oxide, and adhesive through material mixing and drying. The method has scientific formula and simple and reasonable process, can realize the quick refining dephosphorization of molten steel until the content of the phosphorus is lower than 0.0030 percent proven by application, is high in efficiency, steady and short in time, remedies the defect ...

Technique for controlling accurate addition of micro-element in steel

The invention relates to an external refining technology for steel making, in particular to a process method for controlling the accurate adding of trace elements in steel, which comprises the following steps of: a. initial deoxidation: molten steel is subjected to primary smelting in a converter, a deoxidizing agent is added into a ladle for the initial deoxidation during the tapping process, the adding amount of the deoxidizing agent is between 1.5 and 3.5kg/t; b. deep deoxidation: aluminum is added to perform the deep deoxidation to the molten steel after the initial desoxydation is finished, and acid-soluble aluminum in the molten steel is controlled to between 0.02 and 0.04 percent; c. refining: the ladle is transported to an LF, RH, CAS-OB or VD station for refining; d. the adding of compound spheres: the ladle is transported to the RH station, and the compound spheres are added into a blanking tube at the opposite side of a RH descending tube; and e. continuous casting: the continuous ...

Technological process for molten steel secondary refining dephosphorization to produce ultra-low phosphorus steel

The invention relates to a process for controlling phosphor in producing an ultra-low phosphorus steel by a microalloy steel, a high carbon steel and a special steel, in particular to a process methodfor producing the ultra-low phosphorus steel by refining and dephosphorization outside a molten steel furnace. The method comprises: (1) a step of tapping in a converter, during which, a tapping temperature is between 1550 and 1660 DEG C; a phosphor content is lower than 0.02 percent in tapping; and steel is tapped by adopting the treatment of non-deoxidization and slag stopping; (2) a step of primary dephosphorization, during which, a dephosphorization fusing agent is added into a steel ladle along the steel flow when the steel is tapped in the converter; and an adding amount of the dephosphorization fusing agent is between 5 and 20 kg/t; (3) a step of deep dephosphorization, during which, cored wire is fed to a steel liquid by adopting a wire feeding process; (4) a step of slag skimming: ...

Continuous casting tundish gas curtain removing nonmetal impurities method

Method for reclaiming zinc-iron-containing dust and sludge

The invention provides a method for reclaiming zinc-iron-containing dust and sludge. The method comprises the following steps of: (1) material preparation, namely performing calculation according to components of different dusts and sludge to ensure that the excess coefficient of free carbon in the materials reaches 1.0 to 1.4; (2) material mixing, namely uniformly mixing and drying the materials to be sent to a storage bin for later use; (3) material feeding, namely continuously and uniformly adding dust and sludge from the storage bin into molten iron flow from a main molten iron trough and other positions through feed equipment according to determined weight by calculation, and reducing ferric oxide and zinc oxide in the dust and sludge by using heat of high-temperature molten iron; and (4) zinc and iron separation, namely recovering zinc-containing smoke by using dust-collection equipment of a casting house to obtain a zinc oxide product or zinc oxide enriched dust so as to realize ...

Sinter production method for reducing sintering solid burnup and enhancing intensity

The invention provides a sinter production method for reducing sintering solid burnup and enhancing intensity, which comprises the steps of preparing materials, mixing and pelletizing, distributing materials and sintering. The sinter production method is characterized in that coke powder for sintering is pulverized and prescreened before material preparation; the coke powder is screened into 4 granularity levels: the granularity level less than 1mm, the granularity level of 1 to 3mm, the granularity level of 3 to 5mm and the granularity level larger than 5mm, mixed according to the weight percentages of 55% to 59% of the granularity level less than 1mm, 23% to 27% of the granularity level of 1 to 3mm, 9% to 13% of the granularity level of 3 to 5mm and 4% to 8% of the granularity level larger than 5mm and then prepared with other raw materials. The sinter production method can promote solid fuels to be reasonably burned in the process of sintering; the mineralization processes of iron ores ...

Technique for manufacturing ultra-low phosphoretic steel with outside-stove refining dephosphorization

The invention relates to a method for controlling phosphorus in the production of ultra-low phosphorous steel by microalloy steel, high carbon steel and special steel, in particular to a process method for producing the ultra-low phosphorous steel by external refining dephosphorization, which comprises the following steps of: 1) converter tapping: the temperature is between 1,550 and 1,660 DEG C, the content of the phosphorus is less than 0.02 percent, and the nondeoxidation and the slag-stopping treatment are adopted for tapping; 2) initial dephosphorization: dephosphorizing flux is added into a ladle with steel stream during the converter tapping, and the adding amount is between 5 and 20kg/t; 3) deep dephosphorization: a powder spraying process is adopted to spray combined flux into molten steel; 4) slag skimming: the vacuum breaking and the slag skimming are performed , and then ladle covering flux is added; 5) heating and stirring: the heating and stirring are performed in a refining ...

Technique for desulfurization in refining process

The invention relates to an external refining process for various microalloy steel and special steel, in particular to a process method for desulphurization during the refining process, which is the preferred process method for the desulphurization during the refining processes of various microalloy steel or special steel. The process comprises the following steps of: a. deoxidation: molten steel is subjected to deoxidation treatment first to realize that alpha[O] is less than or equal to 0.0003 percent; b. the spraying of combined powder: the molten steel is refined at an LF, RH, VD or CAS-OB station, and a powder spraying process is adopted to spray the combined powder into the molten steel at the LF, RH, VD or CAS-OB station; and c. continuous casting: the continuous casting adopts the whole-process protection casting. Proven by application, the process has strong desulphurization ability with a desulphurization rate between 60 and 90 percent, can realize the refining desulphurization ...

Rotary furnace cooling agent made of metallurgical waste material product and manufacture method thereof

The invention provides a rotary furnace cooling agent and a manufacturing method thereof. The cooling agent is a carbonic and ferreous conglomeration which mainly takes iron scale, carbonic waste material and ferreous waste material as raw materials, and prepared by additionally adding caking agent into the raw materials. The weight percentage of the main chemical compositions of the cooling agentmeets the following condition: the carbon content is 5-25%, the content of TFe is more than or equal to 50%, the content of S is less than or equal to 0.50% and the content of P is less than or equalto 0.50%. The manufacturing method comprises: the wet materials in the carbonic waste material and the ferreous waste material are firstly dried and crushed by a crusher, and then enters a blending machine to be mixed together with the dry materials such as the iron scale and the like; the mixture is added with the caking agent to be evenly mixed, and the mixed material is sent into a mixing milland ...

Composite sphere for manufacturing ultra-low phosphoretic steel with outside-stove refining dephosphorization and its manufacturing method

The invention relates to a method for controlling phosphorus in the production of ultra-low phosphorous steel by microalloy steel and special steel, in particular to a compound sphere for producing the ultra-low phosphorous steel by external refining dephosphorization and a preparation method thereof. The compound sphere consists of a spherical core and a shell, wherein, the spherical core mainly comprises dephosphorizing flux, calcium carbonate, magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate, and the shell mainly comprises one of calcium oxide or magnesium oxide or a mixture of the calcium oxide and the magnesium oxide; and the compound sphere is prepared by material mixing, drying, and compound sphere preparation on sphere preparation equipment. The method has scientific formula and simple and reasonable process, can realize the quick refining dephosphorization of molten steel until the content of the phosphorus is lower than 0.0030 percent proven ...

Technique for manufacturing ultra-low phosphoretic steel with outside-stove refining dephosphorization of liquid steel

The invention relates to a method for controlling phosphorus in the production of ultra-low phosphorous steel by microalloy steel, high carbon steel and special steel, in particular to a process method for producing the ultra-low phosphorous steel by external refining dephosphorization of molten steel, which comprises the following steps of: 1) converter tapping: the temperature is between 1,550 and 1,660 DEG C, the content of the phosphorus is less than 0.02 percent, and the nondeoxidation and the slag-stopping treatment are adopted for tapping; 2) initial dephosphorization: dephosphorizing flux is added into a ladle with steel stream during the converter tapping, and the adding amount is between 5 and 20kg/t; 3) deep dephosphorization: the positions of a blanking tube and a descending tube are adjusted to ensure that the descending tube is positioned at the opposite side of the blanking tube, a ladle is transported to a RH station and is pumped into vacuum, compound spheres are added ...

Method for producing fine oxide dispersion steel

The invention relates to an external refining technology for steel making, in particular to a preparation method for fine oxide dispersion steel, which comprises the following steps that: i) a deoxidation product is removed, wherein, power, cored wires, compound pellets or compound spheres are fed into molten steel at an LF, RH, VD or CAS-OB station through a method of power spraying, wire feeding, pellet shooting, or direct feeding of the spheres after the molten steel is deoxidated; and ii) a dispersed oxide is generated, wherein, when the content of oxygen in the molten steel is between 0.0001 and 0.008 percent, a deoxidizing element among Ti, Zr, RE, Y, Al, Ca, Mg and Ba is added into the molten steel. The method is more effective and safer to the control of oxide inclusions in the molten steel, and can steadily and quickly perform the mass production of the fine oxide dispersion steel the oxide particle diameters of which are less than 1mu m, thereby extremely improving the quality ...

Method for producing hot-rolled steel coil

The invention relates to a method for producing a hot-rolled steel coil, which comprises the following steps of: 1) designing components, pretreating molten iron, smelting in a converter, switching nitrogen and argon, and tapping to obtain molten steel; 2) performing continuous casting on the molten steel to obtain a plate blank, wherein the content of the molten steel in a continuously cast intermediate ladle is controlled to be between 8 and 15t and the liquid level is controlled to be between 200 and 350mm when the intermediate ladle is not poured; and pouring is protected in the whole process, and the insertion depth of a long nozzle is between 300 and 400mm; 3) heating the plate blank; and 4) rolling and curling the heated plate blank. By the method, the content of C and Mn in the components of Q235q-D steel is reduced, the comprehensive performance of the Q235q-D steel is improved by appropriate rolling process and controlled cooling process, and a low-cost and high-performance Q235q-D ...

Method for sintering high-aluminum refractory limonite

The invention provides a method for sintering high-aluminum refractory limonite, which comprises steps of proportioning sinter, performing primary mixing and secondary mixing, distributing, igniting, sintering, cooling and sieving, and is characterized in that: the sinter comprises the following components in percentage by weight: 5 to 15 percent of high-aluminum refractory limonite, 80 to 65 percent of other iron ores, 13 to 16 percent of flux and 2 to 4 percent of fuel; and the high-aluminum refractory limonite is sieved before being proportioned, the high-aluminum refractory limonite of which the diameter is less than 1mm is mixed with 5 to 10 percent of the total amount of limestone powder in the flux so as to prepare particles of which the water content is 6.5 to 7.5 percent and the diameter is less than 3mm, and 5 to 10 weight percent of high-aluminum refractory limonite of which the diameter is more than or equal to 1mm is wetted by water. The high-aluminum refractory limonite in ...

Technological process for removing fine occluded foreignsubstance in molten steel

The invention relates to an external refining technology of various micro-alloy steels and special steels, in particular to a technology for removing slag inclusions in molten steel. The technology of the invention comprises the steps as follows: a. the adjustment of an RH work position: the positions of a down pipe and a feed pipe of the RH are adjusted to ensure that the down pipe is positioned at the opposite side of the feed pipe; b. refining: after being transported to the RH work position, ladles are done with temperature measurement, sampling, vacuumizing, ingredient adjustment and clean circulation; c. input of compound spheres: after the refining, the compound spheres are put into the molten steel at the work position; d. continuous casting: after the compound spheres are put into the molten steel, the molten steel is then directly cast on a machine and the continuous casting adopts a whole-process protection casting. The technology of the invention can control the size and the ...

Powder preparation additive for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method

The invention relates to an external refining method for microalloy steel and special steel, in particular to a powder additive for external refining desulphurization and fine inclusion removal and a preparation method thereof. The powder additive is the preferred powder additive for refining desulphurization and fine inclusion removal of various microalloy steel or special steel. The powder additive is prepared by mixing raw materials of low melting point premelting slag powder, calcium fluoride, calcium carbonate or magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate, calcium oxide or magnesium oxide or a mixture of the calcium oxide and the magnesium oxide, and adhesive according to a formula. The method has scientific formula and simple and reasonable process, can effectively remove inclusions in molten steel, can realize the quick refining desulphurization of the molten steel until the content of sulfur is lower than 0.0030 percent proven by application ...

Rotary furnace cooling agent and manufacturing method thereof

The invention provides a rotary furnace cooling agent and a manufacturing method thereof. The cooling agent is a carbonic and ferreous conglomeration which mainly takes iron scale, carbonic dry ash and ferreous dry waste material as raw materials, and prepared by additionally adding caking agent into the raw materials. The weight percentage of the main chemical compositions of the cooling agent meets the following condition: the carbon content is 5-25%, the content of TFe is more than or equal to 50%, the content of S is less than or equal to 0.50% and the content of P is less than or equal to0.50%. The manufacturing method comprises: the iron scale, the carbonic dry ash and the ferreous dry waste material are firstly sent into a blending machine to be mixed together and evenly mixed withthe caking agent; after being evenly mixed, the materials are sent into a mixing mill and then into a twin-roller ball press machine to be pressed into conglomeration; the pressed conglomeration is screened ...

Electric field energy generation releasing device for processing molten steel and control system thereof

Long nozzle for pouring basket metallurgy and application thereof

The invention provides a long nozzle for pouring basket metallurgy and the application thereof; the long nozzle comprises a nozzle body, a through hole is arranged on the wall of an upper part of thenozzle and is connected with an external conveying pipe by a joint, and the axial direction of the through hole and the axial direction of the upper part of the nozzle form 10-90 degrees. The long nozzle can effectively control non-metallic inclusion in molten steel, accurately control and regulate the content of trace elements in molten steel and produce fine oxides to disperse steel; the long nozzle has simple structure and rational design, and has high efficiency on removing fine oxides and can slow down the blocking phenomenon of a pouring basket submersed nozzle; the long nozzle can control extra particle quantity , has high hit rate to trace alloy elements and uniform ingredients; by adopting the long nozzle, various beneficial additives are added in the steel, and the application isstrong ...

Technological process for removing small inclusions in secondary refining

The invention relates to an external refining technology of various micro-alloy steels and special steels, in particular to a technology for removing slag inclusions in molten steel by the external refining technology. The technology of the invention comprises the steps as follows: a. molten steel is refined at LF, RH, VD or CAS-OB work position; b. a wire feeding technology is adopted to feed cored wires into the molten steel at the work positions; c. the molten steel is then directly cast on a machine after the wire feeding and the continuous casting adopts a whole-process protection casting. As the added cored wires have a scientific and reasonable prescription, when micro-air bubbles occur in the molten steel, the bubbles have high collision probability with the slag inclusions and fine slag drops have the function of wash heat and can also effectively remove the slag inclusions in the molten steel. The technology of the invention can control the size and the quantity of the non-metallic ...

Method for treating zinc-iron-containing dust and sludge

The invention provides a method for treating zinc-iron-containing dust and sludge. The method comprises the following steps of: (1) material preparation, namely performing calculation according to components of different dusts and sludge to ensure that the excess coefficient of free carbon in the materials reaches 1.0 to 1.4; (2) material mixing, namely uniformly mixing the materials and drying natural particle materials or cold bound pellets to be sent to a storage bin for later use; (3) material feeding, namely adding dust and sludge into an empty molten iron tank after molten iron is just poured from the molten iron tank and preheating the dust and sludge materials by using waste heat of the empty molten iron tank; (4) zinc and iron separation, namely recovering zinc-containing smoke by using dust-collection equipment; and (5) material melting, namely further reducing the dust and sludge materials by using high-temperature molten iron in a blast furnace casting process and melting the ...

Method for producing fine oxide dispersion steel

Technological process for removing fine occluded foreignsubstance in molten steel

The invention relates to an external refining technology of various micro-alloy steels and special steels, in particular to a technology for removing slag inclusions in molten steel. The technology of the invention comprises the steps: a. molten steel is refined at LF, RH, VD or CAS-OB work position; b. a powder spraying technology is adopted to spray powder into the molten steel at the work positions; c. the molten steel is then directly cast on a machine after the powder spraying and the continuous casting adopts a whole-process protection casting. As the added powder has a scientific and reasonable prescription, when micro-air bubbles occur in the molten steel, the bubbles have high collision probability with the slag inclusions and fine slag drops have the function of wash heat and can also effectively remove the slag inclusions in the molten steel. The technology of the invention can control the size and the quantity of the non-metallic inclusions in steel and the total oxygen amount ...

Additive for preparing fine oxide dispersion steel, preparation and use thereof

The invention relates to an external furnace refining technology for steelmaking, in particular to an additive for preparing fine oxide dispersion steel, a method for making the same and an application of the additive. The invention belongs to the metallurgical technology field. The additive is a composite sphere consisting of a sphere core and a shell; and the shell of the composite sphere mainly consists of one or two compounds of calcium oxide or magnesia, wherein, the sphere core consists of one material mainly comprising beneficial oxide and swelling agent or another material mainly comprising low-melting point pre-smelting slag powder and swelling agent. Through adopting wire feeding, powder spraying and pill shooting, or even a direct throwing mode, the additive is fed in LF, RH, VD or CAS-OB in order that the oxide class impurity is fine, dispersed and distributed in steel; the addition type is beneficial for application and can stably and rapidly produce fine oxide dispersion steel ...

Technological process for removing fine occluded foreignsubstance in molten steel

The invention relates to an external refining technology of various micro-alloy steels and special steels, in particular to a technology for removing slag inclusions in molten steel. The technology ofthe invention comprises the steps: a. molten steel is refined at LF, RH, VD or CAS-OB work position; b. a powder spraying technology is adopted to spray powder into the molten steel at the work positions; c. the molten steel is then directly cast on a machine after the powder spraying and the continuous casting adopts a whole-process protection casting. As the added powder has a scientific and reasonable prescription, when micro-air bubbles occur in the molten steel, the bubbles have high collision probability with the slag inclusions and fine slag drops have the function of wash heat and canalso effectively remove the slag inclusions in the molten steel. The technology of the invention can control the size and the quantity of the non-metallic inclusions in steel and the total oxygen amount ...

Method for reclaiming zinc-iron-containing dust and sludge

The invention provides a method for reclaiming zinc-iron-containing dust and sludge. The method comprises the following steps of: (1) material preparation, namely performing calculation according to components of different dusts and sludge to ensure that the excess coefficient of free carbon in the materials reaches 1.0 to 1.4; (2) material mixing, namely uniformly mixing and drying the materialsto be sent to a storage bin for later use; (3) material feeding, namely continuously and uniformly adding dust and sludge from the storage bin into molten iron flow from a main molten iron trough andother positions through feed equipment according to determined weight by calculation, and reducing ferric oxide and zinc oxide in the dust and sludge by using heat of high-temperature molten iron; and (4) zinc and iron separation, namely recovering zinc-containing smoke by using dust-collection equipment of a casting house to obtain a zinc oxide product or zinc oxide enriched dust so as to realize zinc ...

Method for treating zinc-iron-containing dust and sludge

The invention provides a method for treating zinc-iron-containing dust and sludge. The method comprises the following steps of: (1) material preparation, namely performing calculation according to components of different dusts and sludge to ensure that the excess coefficient of free carbon in the materials reaches 1.0 to 1.4; (2) material mixing, namely uniformly mixing the materials and drying natural particle materials or cold bound pellets to be sent to a storage bin for later use; (3) material feeding, namely adding dust and sludge into an empty molten iron tank after molten iron is just poured from the molten iron tank and preheating the dust and sludge materials by using waste heat of the empty molten iron tank; (4) zinc and iron separation, namely recovering zinc-containing smoke by using dust-collection equipment; and (5) material melting, namely further reducing the dust and sludge materials by using high-temperature molten iron in a blast furnace casting process and melting the ...

Technological process for removing small inclusions in secondary refining

The invention relates to an external refining technology of various micro-alloy steels and special steels, in particular to a technology for removing slag inclusions in molten steel by the external refining technology. The technology of the invention comprises the steps as follows: a. molten steel is refined at LF, RH, VD or CAS-OB work position; b. a wire feeding technology is adopted to feed cored wires into the molten steel at the work positions; c. the molten steel is then directly cast on a machine after the wire feeding and the continuous casting adopts a whole-process protection casting. As the added cored wires have a scientific and reasonable prescription, when micro-air bubbles occur in the molten steel, the bubbles have high collision probability with the slag inclusions and fine slag drops have the function of wash heat and can also effectively remove the slag inclusions in the molten steel. The technology of the invention can control the size and the quantity of the non-metallic ...

Technique for preparing fine oxide dispersion steel

The invention relates to an external refining technology for steel making, in particular to a process method for preparing fine oxide dispersion steel, which comprises the following steps that: i) a deoxidation product is removed, wherein, power, cored wires, compound pellets or compound spheres are fed into molten steel at an LF, RH, VD or CAS-OB station through a method of power spraying, wire feeding, pellet shooting, or direct feeding of the spheres after the molten steel is deoxidated; and ii) a dispersed oxide is generated, wherein, when the content of oxygen in the molten steel is between 0.0001 and 0.008 percent, the compound spheres, spherical cores of which are mainly beneficial oxides and expanding agents, are added into the molten steel during the refining process. The method is more effective and safer to the control of oxide inclusions in the molten steel, and can steadily and quickly perform the mass production of the fine oxide dispersion steel the oxide particle diameters ...

一种生产超低磷钢的控制磷的方法

... 一种生产超低磷钢的控制磷的方法，涉及冶炼超低磷钢种过程中对磷的控制方法。其解决了采用“双造渣”和“双联法”及“三脱”进行冶炼时存在的工艺复杂、冶炼时间长、且由于进行“三脱”后的铁水温度低，使加入的废钢量大大减少等不足。其技术措施：向炼钢炉内加入约占炉子金属料装入8～10％(重量比)的高碱性、高氧化性的造渣剂进行炼钢炉脱磷，出钢时的磷控制在0.008％(重量比)以下→对钢水罐不断进行吹氩搅拌直至出钢结束后3～5分钟，同时加入钢水和铁水均能用的脱磷剂及活性石灰→吹氩搅拌结束后，在精炼炉进行加热搅拌(不脱氧)→根据钢种需要，直接到真空进行脱氧合金化或扒掉钢渣后再进行脱氧合金化→进行连铸浇注回磷控制。 ...

Production method of hot rolled steel coil

The invention relates to a production method of a hot rolled steel coil, comprising the following steps of: (1) designing components, preprocessing molten iron, then smelting in a converter, switching between nitrogen and argon, and tapping to obtain molten steel; (2) continuously casting the molten steel to obtain a plate blank, wherein the molten steel quantity of a tundish when the continuous casting tundish is stopped to be poured is controlled at 8-15t, and the liquid level is controlled at 200-350 mm; protecting the pouring in the whole process, wherein the inserting depth of a long water gap is 300-400 mm; (3) heating the plate blank; and (4) finally, rolling the heated plate blank and curling to obtain the hot rolled steel coil. With the production method, the contents of C and Mn in the components of Q235q-C steel are reduced, in addition, by adopting a proper rolling process and a cooling control process, the combination property of the Q235q-C steel is enhanced, and a Q235q-C ...

Core cabling wire for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method

The invention relates to an external refining method for various microalloy steel and special steel, in particular to a cored wire for external refining desulphurization and fine inclusion removal of molten steel and a preparation method thereof. A wire core of the cored wire is prepared by mixing raw materials of low melting point premelting slag powder, calcium fluoride, calcium carbonate or magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate, calcium oxide or magnesium oxide or a mixture of the calcium oxide and the magnesium oxide, and adhesive according to a formula; a powder material of the wire core takes low carbon steel strip with 2 to 5mm as a sheath; and a monolayer steel lapping mode is adopted to prepare the cored wire on a wire making machine. The method has scientific formula and simple and reasonable process, can effectively remove inclusions in the molten steel, can realize the quick refining desulphurization of the molten steel until the ...

Corrosive agent for displaying silicon steel coagulation tissue and its preparation method

The invention provides a corrosive for the revealing of the silicon steel solidification structure. The invention has the component and blending ratio of the corrosive that 0.9 to 1.2 gram of a picronitric acid and/or 0.9 to 1.2 gram of a stannous acid, 10 to 20 gram of a ferric chloride, 20 to 50 milliliter of an absolute ethyl alcohol, 15 to 18 milliliter of a hydrochloric acid, 0.2 to 0.5 gram of a copper chloride, 0.2 to 0.5 gram of a magnesium chloride and 80 to 100 milliliter of a distilled water. The invention has the dosing method of the corrosive that the picronitric acid and/or the stannous acid and the ferric chloride are put into a container; the distilled water is divided into two shares, and one share is added into a medicine container; the absolute ethyl alcohol is divided into two shares, one share is added into an aqueous solution which is mixed with medicine, and the other share is added into the distilled water; the hydrochloric acid is added into the ethyl alcohol aqueous ...

Technique for manufacturing ultra-low phosphate steel by molten steel refining and dephosphorizing outside furnace

Long nozzle for pouring basket metallurgy and application thereof

The invention provides a long nozzle for pouring basket metallurgy and the application thereof; the long nozzle comprises a nozzle body, a through hole is arranged on the wall of an upper part of the nozzle and is connected with an external conveying pipe by a joint, and the axial direction of the through hole and the axial direction of the upper part of the nozzle form 10-90 degrees. The long nozzle can effectively control non-metallic inclusion in molten steel, accurately control and regulate the content of trace elements in molten steel and produce fine oxides to disperse steel; the long nozzle has simple structure and rational design, and has high efficiency on removing fine oxides and can slow down the blocking phenomenon of a pouring basket submersed nozzle; the long nozzle can control extra particle quantity , has high hit rate to trace alloy elements and uniform ingredients; by adopting the long nozzle, various beneficial additives are added in the steel, and the application is ...

Technique for desulfurization in refining process

The invention relates to an external refining process for various microalloy steel and special steel, in particular to a process method for desulphurization during the refining process, which is the preferred process method for the desulphurization during the refining processes of various microalloy steel or special steel. The process comprises the following steps of: a. deoxidation: molten steelis subjected to deoxidation treatment first to realize that alpha[O] is less than or equal to 0.0003 percent; b. the spraying of combined powder: the molten steel is refined at an LF, RH, VD or CAS-OB station, and a powder spraying process is adopted to spray the combined powder into the molten steel at the LF, RH, VD or CAS-OB station; and c. continuous casting: the continuous casting adopts thewhole-process protection casting. Proven by application, the process has strong desulphurization ability with a desulphurization rate between 60 and 90 percent, can realize the refining desulphurization ...

Production method of fine oxide dispersion steel

The invention provides a method for producing fine oxide dispersion steel, which is characterized in that: a through hole of which the axial direction and the axial direction of the upper part of a water gap have an angle of between 10 and 90 DEG is formed on the wall of the upper part of a long water gap for tundish metallurgy; the through hole is connected with a gas source through a joint connected with an external delivery pipe; and powder feed equipment blows beneficial oxide fine powder into molten steel through the external delivery pipe and the long water gap during continuous casting of steel, wherein the powder granularity is between 1nm and 500 mu m. Used carriers are inert gases Ar or N2, the gas flow is between 3 and 500 l/min, and the air pressure is between 1.0 and 12atm. By the technique, oxide inclusions in the molten steel can be effectively and completely controlled, and a great amount of fine oxide dispersion steel of which the oxide grain diameter is less than 2 mu ...

Core cabling wire for secondary refining dephosphorization to produce ultra-low phosphorus steel and preparation thereof

The invention relates to a process for controlling phosphor in producing an ultra-low phosphorus steel by a microalloy steel, a high carbon steel and a special steel, in particular to a cored wire for producing the ultra-low phosphorus steel by refining and dephosphorization outside a furnace and a preparation method thereof. A core part of the cored wire is prepared by adopting the raw materials of a dephosphorization fusing agent, calcium fluoride, calcium carbonate or magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate, calcium oxide or magnesia or a mixture of the calcium oxide and the magnesia and a caking agent according to a formula at a mixture ratio; and a powdery material of the core part uses a low-carbon steel strip with a thickness of between 2 and 5 mm as a husk and adopts a monolayer steel related joint mode to prepare the cored wire on a wire manufacturing machine. The cored wire has a scientific formula and a simple and reasonable process ...

Rotary furnace cooling agent made of metallurgical waste material product and using method thereof

The invention provides a rotary furnace cooling agent and a manufacturing method thereof. The cooling agent is a carbonic and ferreous conglomeration which mainly takes iron scale, carbonic waste material and ferreous waste material as raw materials, and prepared by additionally adding caking agent into the raw materials. The weight percentage of the main chemical compositions of the cooling agent meets the following condition: the carbon content is 5-25%, the content of TFe is more than or equal to 50%, the content of S is less than or equal to 0.50% and the content of P is less than or equal to 0.50%. The manufacturing method comprises: the wet materials in the carbonic waste material and the ferreous waste material are firstly dried and crushed by a crusher, and then enters a blending machine to be mixed together with the dry materials such as the iron scale and the like; the mixture is added with the caking agent to be evenly mixed, and the mixed material is sent into a mixing mill ...

Carbon-free molten steel holding agent and its production

The molten steel holding agent has the chemical components of SiO2 20-35 wt% and Al2O3 45-65 wt%; unit weight less than 0.6g/ml; melting point higher than 1450 deg.c and size of 1-8 mm. It is produced in one of two processes, one is sintering process including the steps of pelletizing by adding natural organic flammable to refractory aluminium silicate material and high-temperature calcination toeliminate carbon, and the other is mixing process including the steps of mixing light refractory material as core with refractory aluminium silicate material and pelletizing. The present invention has no molten steel carburetting and less environmental pollution and is used for holding molten steel in steel ladle and tundish, and especially suitable for holding molten steel of low carbon and ultravlow carbon steel.

Composite sphere for manufacturing ultra-low phosphoretic steel with outside-stove refining dephosphorization and its manufacturing method

The invention relates to a method for controlling phosphorus in the production of ultra-low phosphorous steel by microalloy steel and special steel, in particular to a compound sphere for producing the ultra-low phosphorous steel by external refining dephosphorization and a preparation method thereof. The compound sphere consists of a spherical core and a shell, wherein, the spherical core mainlycomprises dephosphorizing flux, calcium carbonate, magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate, and the shell mainly comprises one of calcium oxide or magnesium oxide or a mixture of the calcium oxide and the magnesium oxide; and the compound sphere is prepared by material mixing, drying, and compound sphere preparation on sphere preparation equipment. The method has scientific formula and simple and reasonable process, can realize the quick refining dephosphorization of molten steel until the content of the phosphorus is lower than 0.0030 percent proven ...

Production method of hot rolled steel coil for ship building

The invention relates to a production method of a hot rolled steel coil for ship building, comprising the following steps of: (1) designing components, preprocessing molten iron, then smelting in a converter, switching between nitrogen and argon, and tapping to obtain molten steel; (2) continuously casting the molten steel to obtain a plate blank, wherein the molten steel quantity of a tundish when the continuous casting tundish is stopped to be poured is controlled at 8-15t, and the liquid level is controlled at 200-350 mm; protecting the pouring in the whole process, wherein the inserting depth of a long water gap is 300-400 mm; (3) heating the plate blank; and (4) finally, rolling the heated plate blank and curling to obtain the hot rolled steel coil for ship building. The contents of C and Mn are reduced greatly by adopting a TMCP (Thermo Mechanical Control Process) and an RPC (Remote Position Control) rolling process and utilizing niobium microalloying, and the production cost is lowered ...

Technological process for molten steel secondary refining dephosphorization to produce ultra-low phosphorus steel

The invention relates to a process for controlling phosphor in producing an ultra-low phosphorus steel by a microalloy steel, a high carbon steel and a special steel, in particular to a process method for producing the ultra-low phosphorus steel by refining and dephosphorization outside a molten steel furnace. The method comprises: (1) a step of tapping in a converter, during which, a tapping temperature is between 1550 and 1660 DEG C; a phosphor content is lower than 0.02 percent in tapping; and steel is tapped by adopting the treatment of non-deoxidization and slag stopping; (2) a step of primary dephosphorization, during which, a dephosphorization fusing agent is added into a steel ladle along the steel flow when the steel is tapped in the converter; and an adding amount of the dephosphorization fusing agent is between 5 and 20 kg/t; (3) a step of deep dephosphorization, during which, cored wire is fed to a steel liquid by adopting a wire feeding process; (4) a step of slag skimming: ...

Technique for outside-stove refining dephosphorization

The invention relates to an external refining process for various microalloy steel and special steel, in particular to a process method for external refining desulphurization, which is the preferred process method for desulphurization during the refining processes of various microalloy steel or special steel. The process comprises the following steps of: a. deoxidation: molten steel is firstly subjected to deoxidation treatment to realize that alpha[O] is less than or equal to 0.0003 percent; b. the adjustment of a RH station: the positions of a RH descending tube and a blanking tube are adjusted to ensure that the RH descending tube is positioned at the opposite side of the blanking tube; c. the adding of compound spheres: after a ladle is transported to the RH station, the compound spheres are added into the molten steel at the RH station after temperature measurement sampling, vacuum pumping, clean recycle and refining are finished; and d. continuous casting: the continuous casting adopts ...

Phosphorus controlling method for producing ultra-low phosphorus steel

The phosphorus-controlling method for producing ultra-low-phosphorus steel includes the following technical meansures: adding high-alkaline high-oxidative slagging constituent whose addition quantityis 8-10% of weight of metal material in the furnace to make dephosphorization, controlling tapping phosphorus content at below 0.008% (weight ratio), continuously blowing argon into molten steel tankand stirring until the tapping is completed for 3-5 min., at the same time adding dephosphorizing agent and active lime, heating and stirring in fining furnace, vacuum deoxidation and alloying and continuously casting and controlling phosphorus content.

Technological process for secondary refining desulphurization

The invention relates to an external refining technique used for various micro-alloyed steel and special steel, in particular to a technical method used for the external refining desulfurization, which is preferred in the refining desulfurization process of various micro-alloyed steel or the special steel. The technique comprises the following: a. a step of deoxidizing, in which the molten steel is deoxidized to realize that alpha [O] is less than or equal to 0.0003 percent; b. a step of feeding a core-spun yarn, in which the molten steel is refined at the position of LF, RH, VD or CAS-OB, the yarn feeding technique is adopted to feed the core-spun yarn into the molten steel at the positions; and c. a step of continuous casting, in which the continuous casting process is cast protectivelyin the whole process. The a technique shows that the technique has strong decarbolizing ability and the desulfurization degree between 60 and 90 percent by application, realizes that the molten steelis ...

Method of removing impurity from molten steel

The invention provides a method of removing impurity from molten steel and is characterized by: on the wall of tundish metallurgical long outlet upper potion, forming a through hole whose axial direction forms an angle of 10 to 90 DEG with the axial direction of outlet upper portion, connecting the through hole with gas source through a joint connected with an external conveyer pipe, during continuous casting, through the external conveyer pipe blowing into the long outlet with inert gas with a gas flow of 3 to 300 l/min and an air pressure of 1.0 to 10 atm; or through the external conveyer pipe and long outlet, using powder-sending equipment to blow into molten steel with carbonate powder or various synthesis slag powder with a granularity of 0.1 to 3 mm, the carriers being inert gas Ar or N2 with a gas flow of 3 to 400 l/min and an air pressure of 1.0 to 15 atm. The invention is advantageous by easy operation, low costs and high impurity removing efficiency; it is in favor of alleviating ...

Control method for accurately adding trace elements to steels

The invention provides a control method for accurately adding trace elements to steels. The control method is characterized in that the wall of the upper part of a long nozzle for pouring basket metallurgy is provided with a through hole with an axial direction at an angle of 10-90 degrees with the axial direction of the upper part of the long nozzle; the through hole is connected with a gas source through a connector connected with an external delivery pipe; powder delivery equipment jets various alloy powder materials, rare earth powder and various beneficial additives contained in the steels to liquid steel through the external delivery pipe and the long nozzle during continuous steel casting; powder granularity is 0.05-3mm; a used carrier is an inert gas Ar or N2; gas flow rate is 3-500L/minute; and gas pressure is 1.0-12atm. The invention can be used for outstandingly enhancing the stable and effective recovery rate of the trace elements in the steels; trace alloying elements have ...

Rotary furnace cooling agent and manufacturing method thereof

The invention provides a rotary furnace cooling agent and a manufacturing method thereof. The cooling agent is a carbonic and ferreous conglomeration which mainly takes iron scale, carbonic dry ash and ferreous dry waste material as raw materials, and prepared by additionally adding caking agent into the raw materials. The weight percentage of the main chemical compositions of the cooling agent meets the following condition: the carbon content is 5-25%, the content of TFe is more than or equal to 50%, the content of S is less than or equal to 0.50% and the content of P is less than or equal to 0.50%. The manufacturing method comprises: the iron scale, the carbonic dry ash and the ferreous dry waste material are firstly sent into a blending machine to be mixed together and evenly mixed with the caking agent; after being evenly mixed, the materials are sent into a mixing mill and then into a twin-roller ball press machine to be pressed into conglomeration; the pressed conglomeration is screened ...

Technique for preparing fine oxide dispersion steel

Composite sphere for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method

The invention relates to an external refining method for microalloy steel and special steel, in particular to a compound sphere for external refining desulphurization and fine inclusion removal and a preparation method thereof. The compound sphere is the preferred compound sphere for refining desulphurization and fine inclusion removal of various microalloy steel or special steel. The compound sphere consists of a spherical core and a shell, wherein, the spherical core mainly comprises low melting point premelting slag powder, calcium carbonate, magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate; and the shell mainly comprises one of calcium oxide or magnesium oxide or a mixture of the calcium oxide and the magnesium oxide. The method has scientific formula and simple and reasonable process, can effectively remove inclusions in molten steel, can realize the quick refining desulphurization of the molten steel until the content of sulfur is lower than 0.0030 ...

Corrosive agent for displaying silicon steel coagulation tissue and its preparation method

The invention provides a corrosive for the revealing of the silicon steel solidification structure. The invention has the component and blending ratio of the corrosive that 0.9 to 1.2 gram of a picronitric acid and/or 0.9 to 1.2 gram of a stannous acid, 10 to 20 gram of a ferric chloride, 20 to 50 milliliter of an absolute ethyl alcohol, 15 to 18 milliliter of a hydrochloric acid, 0.2 to 0.5 gramof a copper chloride, 0.2 to 0.5 gram of a magnesium chloride and 80 to 100 milliliter of a distilled water. The invention has the dosing method of the corrosive that the picronitric acid and/or the stannous acid and the ferric chloride are put into a container; the distilled water is divided into two shares, and one share is added into a medicine container; the absolute ethyl alcohol is divided into two shares, one share is added into an aqueous solution which is mixed with medicine, and the other share is added into the distilled water; the hydrochloric acid is added into the ethyl alcohol aqueous ...

Surface modified superfine powder and production method of surface modified superfine powder

The invention relates to surface modified superfine powder and a production method of the surface modified superfine powder. The surface modified superfine powder consists of one of ceramic, pre-melted slag and alloy material or mixture of two or three of the ceramic, the pre-melted slag and the alloy material, a surface modifier and a superfine powder surface modifier; and the superfine powder with the size of less than 5 microns is prepared by primary crushing of a crusher, airflow micro powder grinding, stirring of a high-speed stirring reaction kettle and surface modification. The selection of components is reasonable, and the raw materials have many categories, are easily obtained and have low price; and the proportion is scientific, the preparation method is reliable and feasible, and the finished powder has good surface physical and chemical properties and conveying property and good flowability and totally can meet the use requirements of tundish powder spraying metallurgy. The ...

Composite sphere for outside-stove refining desulfurization, removing fine foreign matter and its manufacturing method

Method for comprehensively treating and utilizing dust sludge

The invention provides a method for comprehensively treating and utilizing dust sludge. The method comprises the following steps of: (1) dispensing: carrying out dispensing calculation according to main ingredients of various iron-containing dust sludge to ensure that the excess coefficient of the content of free carbon reaches 1.0-1.8; (2) mixing: uniformly mixing materials by using mixing equipment; (3) molding: pressing the mixed material into a dust sludge block mass with a granularity of 5-15mm by using molding equipment; (4) drying: drying the molded dust sludge block mass at a temperature below 300 DEG C; (5) charging: after steel-making molten iron in a molten iron pot is blended into a rotating furnace, putting the dust sludge block mass into the hollow molten iron pot through charging equipment according to a weight determined by calculation, preheating and partially reducing the dust sludge block mass by utilizing the molten iron pot and the heat of residual molten iron in the ...

Technological process for secondary refining desulphurization

The invention relates to an external refining technique used for various micro-alloyed steel and special steel, in particular to a technical method used for the external refining desulfurization, which is preferred in the refining desulfurization process of various micro-alloyed steel or the special steel. The technique comprises the following: a. a step of deoxidizing, in which the molten steel is deoxidized to realize that alpha [O] is less than or equal to 0.0003 percent; b. a step of feeding a core-spun yarn, in which the molten steel is refined at the position of LF, RH, VD or CAS-OB, the yarn feeding technique is adopted to feed the core-spun yarn into the molten steel at the positions; and c. a step of continuous casting, in which the continuous casting process is cast protectively in the whole process. The a technique shows that the technique has strong decarbolizing ability and the desulfurization degree between 60 and 90 percent by application, realizes that the molten steel is ...

Technique for outside-stove refining dephosphorization

The invention relates to an external refining process for various microalloy steel and special steel, in particular to a process method for external refining desulphurization, which is the preferred process method for desulphurization during the refining processes of various microalloy steel or special steel. The process comprises the following steps of: a. deoxidation: molten steel is firstly subjected to deoxidation treatment to realize that alpha[O] is less than or equal to 0.0003 percent; b. the adjustment of a RH station: the positions of a RH descending tube and a blanking tube are adjusted to ensure that the RH descending tube is positioned at the opposite side of the blanking tube; c. the adding of compound spheres: after a ladle is transported to the RH station, the compound spheres are added into the molten steel at the RH station after temperature measurement sampling, vacuum pumping, clean recycle and refining are finished; and d. continuous casting: the continuous castingadopts ...

Technological process for removing fine occluded foreign substance in molten steel

Technique for controlling accurate addition of micro-element in steel

Additive for preparing fine oxide dispersion steel, preparation and use thereof

The invention relates to an external furnace refining technology for steelmaking, in particular to an additive for preparing fine oxide dispersion steel, a method for making the same and an application of the additive. The invention belongs to the metallurgical technology field. The additive consists of raw materials proportioned according to a formula; low-melting point pre-smelting slag powder, calcium fluoride, calcium carbonate, magnesium carbonate or a mixture of calcium carbonate and magnesium carbonate, calcium oxide, magnesia or a mixture of calcium oxide and magnesia and caking agent are respectively adopted and prepared to additives with various additive types of core-spun yarn, powder, a composite pellet and a composite sphere; through adopting wire feeding, powder spraying and pill shooting, or even a direct throwing mode, the additive is fed in LF, RH, VD or CAS-OB in order that the oxide class impurity is fine, dispersed and distributed in steel; and the addition type is beneficial ...