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A method for forming and refining silicon-containing molten steel by adding a calcium-containing silicon additive. It is determined whether the calcium content in the calcium-containing silicon is higher or lower than the calcium content required for the finished steel. If the required calcium content is higher than that of the finished steel, the calcium-containing silicon additive is added according to the excess calcium previously used in the refining process, and combined with sulfur and other impurities during refining. A calcium-containing silicon additive comprising the total amount of calcium required in the finished steel is added after desulfurization of the molten steel and prior to casting. If the calcium content of the calcium-containing silicon additive is insufficient to provide the total amount of calcium required in the finished product, additional calcium is added to the molten steel during the refining process after desulfurization and before casting.
In the continuous slab casting process, the continuous casting machine comprises: a tundish and a vibrator, in addition to a shroud and an immersion nozzle. The molten steel in the ladle is injected into the tundish and then injected vertically into the air-cooled vibrator through the immersion nozzle, and the continuous casting slab is horizontally taken out from the bottom of the mold. The refractory shield is used to transport molten metal from the ladle to the tundish and then into the intrusive nozzle into the mold to avoid contact oxidation of the molten steel with the air. In order to prevent the slag from entering the mold, the ladle is usually tapped below the slag line. The shroud between the tundish and the mold feed port passes through the intrusive nozzle and is controlled by a stopper.
The slab continuous casting machine produces a wide-section, wide-section rectangular wire that is cut into slabs for hot and cold rolling of sheets or sheet materials. Flat rolled products for thick plates typically have a cast thickness between 100 and 250 mm. The flat-rolled product for a thin slab usually has a thickness of, for example, 30 to 100 mm. Plate casters are commonly used in conjunction with electric arc furnaces or alkaline oxygen top-blown converters in which high temperature metal is produced for the continuous casting machine.
Steel for continuous casting is usually subjected to reduction treatment before casting. Typically, the molten steel is deoxygenated in a ladle metallurgical furnace to achieve the desired oxygen content. Aluminum is widely used as a reducing agent and a grain size control agent in the production of steel. Aluminum is a sacrificial metal that combines with oxygen to form a stable aluminum oxide that is moved into the slag. Aluminum is a particularly desirable material for this purpose because it can be safely stored, handled and transported at ambient temperatures, which are oxidizing agents at steelmaking temperatures.
The thinnest slab casting and the steel galvanized steel number are typical aluminum-separated steels. Although such steel can be cast on a large slab caster as it is, further processing on the sheet caster is required to avoid clogging and plugging of the intrusive nozzle. One convention in thin plate continuous casting is to improve alumina inclusions by treating with calcium to provide greater flow. With proper calcium treatment, most of the alumina (Al2O3) inclusions become liquid and castable, presenting an acceptable surface quality of the cast sheet. For the continuous casting process on a slab caster, a 600 ft (182.9 m) calcium wire was added to the 170 ton (154 metric metric) ladle to avoid nozzle clogging (approximately 0.134 lb/ton, 1.067 kg/ton metric) ) is enough. The 600 ft (182.9 m) calcium wire has a chemical composition of approximately 22.5 lbs (10.2 kg) of calcium and an equivalent of about 16.8 parts per million of effective calcium in the refined steel. The calcium recovered from the calcium wire in the steel is less than 100%, so that the effective calcium is less than the added amount.
There are two main grades for the production of sheet and steel silicon bearing steels on thin-plate continuous casting machines: silicon-bearing steels typically use less than 0.035% silicon, which is usually not required for addition of ferri-silicon or silico-manganese alloys. The silicon bearing steel typically has about 0.1% to 0.5% silicon, and the silicon manganese alloy and/or ferrous silicon are added to achieve the predetermined silicon content.
The problem of wear of the plunger rod has been observed in silicon bearing steels where a ferrosilicon alloy has been added to achieve the desired silicon content in the finished steel. In "Analysis of Rapid Inclusion Recognition and Analysis of Continuous Casting Problems", Story et al., Industrial Exhibition, 2006 Proceedings, Vol. 1, summary table, pages 879-889, can be determined in addition to silicon in ferri-silicon. It can also contain calcium and other alloying elements. To illustrate the wear of the plunger rod, Story et al. utilize a high purity silicon silicate containing about 0.024% calcium.
A method for producing a silicon bearing steel having a carbon content of between 0.003% and 0.5% by weight, comprising the steps of: a) refining molten steel by adding a calcium-containing silicon additive to produce silicon-containing silicon Silicon bearing steel between 0.1% and 0.5%; b) determining the calcium concentration in the calcium-containing silicon additive; c) determining whether the calcium content in the calcium-containing silicon is higher or lower than the calcium content required for the finished steel d) If the required calcium content is higher than the finished steel, the calcium-containing silicon additive is added according to the excess calcium previously in the refining process, and combined with sulfur and other impurities during refining. ; e) adding a calcium-containing silicon additive containing the total amount of calcium required in the finished steel after desulfurization of the molten steel and before casting; f) if the calcium content of the calcium-containing silicon additive is insufficient to provide the calcium required for the finished product The total amount of additional calcium added to the molten metal during the refining process after desulfurization and before casting.
2. The method of refining steel, wherein the silicon bearing steel contains 0.003% to 0.5% by weight of carbon.
3. The method of refining steel, wherein the calcium-containing silicon additive is a ferrous silicon alloy.
4. The method of refining steel, comprising the additional steps of: g) determining the amount of aluminum in the calcium-containing silicon additive; and h) deoxidizing the silicon-bearing steel during refining using the aluminum in the calcium-containing silicon additive.
5. The method of refining steel, wherein the silicon-bearing steel is an aluminum-free steel.
6. The method of refining steel further comprising adding a manganese-containing additive early in the refining process.
7. The method of refining steel, wherein the step of refining molten steel occurs in a ladle metallurgical furnace.
In the continuous slab casting process, the continuous casting machine comprises: a tundish and a vibrator, in addition to a shroud and an immersion nozzle. The molten steel in the ladle is injected into the tundish and then injected vertically into the air-cooled vibrator through the immersion nozzle, and the continuous casting slab is horizontally taken out from the bottom of the mold. The refractory shield is used to transport molten metal from the ladle to the tundish and then into the intrusive nozzle into the mold to avoid contact oxidation of the molten steel with the air. In order to prevent the slag from entering the mold, the ladle is usually tapped below the slag line. The shroud between the tundish and the mold feed port passes through the intrusive nozzle and is controlled by a stopper.
The slab continuous casting machine produces a wide-section, wide-section rectangular wire that is cut into slabs for hot and cold rolling of sheets or sheet materials. Flat rolled products for thick plates typically have a cast thickness between 100 and 250 mm. The flat-rolled product for a thin slab usually has a thickness of, for example, 30 to 100 mm. Plate casters are commonly used in conjunction with electric arc furnaces or alkaline oxygen top-blown converters in which high temperature metal is produced for the continuous casting machine.
Steel for continuous casting is usually subjected to reduction treatment before casting. Typically, the molten steel is deoxygenated in a ladle metallurgical furnace to achieve the desired oxygen content. Aluminum is widely used as a reducing agent and a grain size control agent in the production of steel. Aluminum is a sacrificial metal that combines with oxygen to form a stable aluminum oxide that is moved into the slag. Aluminum is a particularly desirable material for this purpose because it can be safely stored, handled and transported at ambient temperatures, which are oxidizing agents at steelmaking temperatures.
The thinnest slab casting and the steel galvanized steel number are typical aluminum-separated steels. Although such steel can be cast on a large slab caster as it is, further processing on the sheet caster is required to avoid clogging and plugging of the intrusive nozzle. One convention in thin plate continuous casting is to improve alumina inclusions by treating with calcium to provide greater flow. With proper calcium treatment, most of the alumina (Al2O3) inclusions become liquid and castable, presenting an acceptable surface quality of the cast sheet. For the continuous casting process on a slab caster, a 600 ft (182.9 m) calcium wire was added to the 170 ton (154 metric metric) ladle to avoid nozzle clogging (approximately 0.134 lb/ton, 1.067 kg/ton metric) ) is enough. The 600 ft (182.9 m) calcium wire has a chemical composition of approximately 22.5 lbs (10.2 kg) of calcium and an equivalent of about 16.8 parts per million of effective calcium in the refined steel. The calcium recovered from the calcium wire in the steel is less than 100%, so that the effective calcium is less than the added amount.
There are two main grades for the production of sheet and steel silicon bearing steels on thin-plate continuous casting machines: silicon-bearing steels typically use less than 0.035% silicon, which is usually not required for addition of ferri-silicon or silico-manganese alloys. The silicon bearing steel typically has about 0.1% to 0.5% silicon, and the silicon manganese alloy and/or ferrous silicon are added to achieve the predetermined silicon content.
The problem of wear of the plunger rod has been observed in silicon bearing steels where a ferrosilicon alloy has been added to achieve the desired silicon content in the finished steel. In "Analysis of Rapid Inclusion Recognition and Analysis of Continuous Casting Problems", Story et al., Industrial Exhibition, 2006 Proceedings, Vol. 1, summary table, pages 879-889, can be determined in addition to silicon in ferri-silicon. It can also contain calcium and other alloying elements. To illustrate the wear of the plunger rod, Story et al. utilize a high purity silicon silicate containing about 0.024% calcium.
A method for producing a silicon bearing steel having a carbon content of between 0.003% and 0.5% by weight, comprising the steps of: a) refining molten steel by adding a calcium-containing silicon additive to produce silicon-containing silicon Silicon bearing steel between 0.1% and 0.5%; b) determining the calcium concentration in the calcium-containing silicon additive; c) determining whether the calcium content in the calcium-containing silicon is higher or lower than the calcium content required for the finished steel d) If the required calcium content is higher than the finished steel, the calcium-containing silicon additive is added according to the excess calcium previously in the refining process, and combined with sulfur and other impurities during refining. ; e) adding a calcium-containing silicon additive containing the total amount of calcium required in the finished steel after desulfurization of the molten steel and before casting; f) if the calcium content of the calcium-containing silicon additive is insufficient to provide the calcium required for the finished product The total amount of additional calcium added to the molten metal during the refining process after desulfurization and before casting.
2. The method of refining steel, wherein the silicon bearing steel contains 0.003% to 0.5% by weight of carbon.
3. The method of refining steel, wherein the calcium-containing silicon additive is a ferrous silicon alloy.
4. The method of refining steel, comprising the additional steps of: g) determining the amount of aluminum in the calcium-containing silicon additive; and h) deoxidizing the silicon-bearing steel during refining using the aluminum in the calcium-containing silicon additive.
5. The method of refining steel, wherein the silicon-bearing steel is an aluminum-free steel.
6. The method of refining steel further comprising adding a manganese-containing additive early in the refining process.
7. The method of refining steel, wherein the step of refining molten steel occurs in a ladle metallurgical furnace.
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