WO2019103494A1 - Flux de moule, matériau en acier et procédé de fabrication de matériau en acier - Google Patents

Flux de moule, matériau en acier et procédé de fabrication de matériau en acier Download PDF

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Publication number
WO2019103494A1
WO2019103494A1 PCT/KR2018/014467 KR2018014467W WO2019103494A1 WO 2019103494 A1 WO2019103494 A1 WO 2019103494A1 KR 2018014467 W KR2018014467 W KR 2018014467W WO 2019103494 A1 WO2019103494 A1 WO 2019103494A1
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layer portion
steel
weather
oxide
steel material
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PCT/KR2018/014467
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English (en)
Korean (ko)
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정태인
한상우
한승민
권상흠
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주식회사 포스코
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Publication of WO2019103494A1 publication Critical patent/WO2019103494A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations

Definitions

  • the present invention relates to a mold flux, a steel material, and a manufacturing method of a steel material capable of improving the weather resistance of a steel material by forming a thickened layer of weather-resistant metal on the surface of the steel material will be.
  • the steel for weatherability means a steel in which progress of corrosion can be suppressed or prevented so that appearance and physical properties can be used without being severely damaged even when exposed to the outside for a long period of time.
  • a weather resistant steel material is used as a sheathing material, there is no significant change in physical properties even if it is used as it is without coating, which is economically advantageous. Therefore, there have been many studies on improving the weatherability of the steel.
  • Patent Document 1 JP1999-172370 A
  • Patent Document 2 JP1999-071632 A
  • Patent Document 3 JP2012-255184A
  • the present invention provides a method of producing a mold flux, a steel material, and a steel material capable of forming a thickened layer of a weather-resistant metal on the surface of a steel material.
  • the present invention provides a method for producing a mold flux, a steel material, and a steel material capable of improving the weather resistance of the surface of a steel material.
  • the present invention provides a method of manufacturing a mold flux, a steel material, and a steel material capable of reducing the amount of weather-resistant metal used in a steel material manufacturing process.
  • the present invention is a mold flux used in the manufacture of steel, comprising a composition containing an oxide of a weather-resistant metal.
  • the oxide of the weather-resistant metal includes at least one of copper oxide, tin oxide, and niobium oxide.
  • the copper oxide is included in an amount of 2 to 40% by weight based on the total weight of the composition.
  • the tin oxide comprises 1.1 wt% to 40 wt%.
  • the niobium oxide is contained in an amount of 1.3 wt% to 40 wt% with respect to the total weight of the composition.
  • the weather-resistant metal includes at least two of the copper oxide, the tin oxide, and the niobium oxide, and the oxide of the weather-resistant metal is included in an amount of 5 wt% to 40 wt% with respect to the total weight of the composition.
  • the composition further includes a reducing material capable of reducing the oxide of the weatherable metal.
  • the reducing material comprises carbon.
  • the amount of the carbon contained in the composition is calculated by the following equation.
  • A is the content of copper oxide in the composition
  • B is the content of tin oxide in the composition
  • C is the content of niobium oxide in the composition.
  • the present invention is a steel material produced from molten steel, comprising an inner layer portion and an outer layer portion surrounding the inner layer portion, wherein the outer layer portion has a higher concentration of a weathering metal than the inner layer portion.
  • the outer layer portion of the inner layer portion further contains 0.01 to 1% by weight of the copper relative to the total weight of the steel material.
  • the outer layer portion contains 0.01 to 1% by weight of the copper relative to the total weight of the steel material.
  • the tin is further included in the outer layer portion from the inner layer portion in an amount of 0.009 wt% to 0.9 wt% with respect to the total weight of the steel material.
  • the outer layer portion contains 0.005 to 0.9 wt% of the tin, based on the total weight of the steel material.
  • niobium is further contained in the outer layer portion than the inner layer portion in relation to the total weight of the steel material.
  • the niobium is contained in an amount of 0.005 wt% to 0.8 wt% with respect to the total weight of the steel material.
  • the thickness of the outer layer portion is 0.05% to 20% of the total thickness of the steel material.
  • a method of manufacturing a steel material for manufacturing a steel material comprising the steps of: providing a mold flux containing a weather-resistant metal; A process of supplying molten steel into the mold; Supplying the mold flux to the molten steel; And a step of diffusing a weather-resistant metal on the surface of the molten steel in the mold flux to form a thickened layer of weather-resistant metal on the outer layer portion of the steel.
  • the weather-resistant metal includes at least one of copper, tin, and niobium.
  • the step of providing the mold flux may include the step of including the weather resistant metal in oxide form in the mold flux to lower the melting point of the weather resistant metal.
  • the step of forming the concentrated layer of the weather-resistant metal on the outer layer portion of the steel comprises the steps of reducing the oxide of the weather-resistant metal; And diffusing the reduced weather-resistant metal into the solidified structure of the outer layer portion of the steel.
  • a thickened layer of weather-resistant metal can be formed on the surface of the steel material. That is, the content of the weather-resistant metal used for improving the weatherability of the steel material can be controlled to be different between the outer layer portion and the inner layer portion of the steel material. Therefore, the weatherability of the surface of the steel material can be improved while reducing the amount of the weather-resistant metal used for improving the weatherability of the steel material in the casting step of the steel material. Therefore, the production cost of the steel material having weather resistance can be reduced, and the productivity of the steel material can be improved.
  • FIG. 1 is a view showing a structure of a steel material manufacturing facility according to an embodiment of the present invention.
  • FIG. 1 is a view showing a structure of a steel material manufacturing facility according to an embodiment of the present invention.
  • FIG. 2 is a flowchart showing a method of manufacturing a steel material according to an embodiment of the present invention.
  • FIG 3 is a view showing a process in which a thickened layer is formed on an outer layer portion of a weather-resistant metal on a steel material according to an embodiment of the present invention.
  • FIG. 4 is a view showing an outer layer portion of a steel material according to embodiments of the present invention.
  • FIG. 1 is a view showing a structure of a steel material manufacturing facility according to an embodiment of the present invention.
  • the structure of a forced manufacturing facility will be described below.
  • a forced manufacturing facility may include a ladle 10, a tundish 20, a mold 30, and a cooling stand 40.
  • the steel material manufacturing facility may be a continuous casting facility that continuously injects molten steel into the mold 30 and continuously withdraws the reacted cast steel from the lower part of the mold 30 to obtain a billet, a bloom, a slab, and the like .
  • the ladle 10 may be formed in the shape of a cylindrical container.
  • the ladle 10 has an inner space for containing molten steel and the upper part can be opened.
  • the injector 15 may be provided in the lower portion of the ladle 10.
  • the injector 15 may be a shroud nozzle.
  • the injector 15 is extended in the vertical direction to form a path through which molten steel moves inside.
  • An inlet for introducing molten steel is formed in the upper end of the injector 15, and an outlet for discharging molten steel may be formed in the lower end.
  • the molten steel stored in the ladle 10 can be injected into the tundish 20 through the injector 15.
  • the ladle 10 can be supported by the ladle turret, and the ladle turret can replace the ladle 10 disposed above the tundish 20 to continuously supply the molten steel to the tundish 20 .
  • the structure and shape of the ladle 10 are not limited to this and may vary.
  • the tundish 20 may be located below the ladle 10. [
  • the tundish 20 can be formed in the shape of a container in which molten steel can be stored.
  • the upper portion of the tundish 20 may be open and the immersion nozzle 25 may be provided at the lower portion thereof.
  • the immersion nozzle (25) can extend in the vertical direction.
  • the immersion nozzle 25 may have an upper end connected to a lug formed on the bottom surface of the tundish 20 and a lower end extended toward the interior of the mold 30. Accordingly, the molten steel introduced into the immersion nozzle 25 through the lubrication port can be supplied into the mold 30.
  • a stopper (not shown) for opening / closing the lances of the tundish 20 may be installed in the tundish 20 to control the flow rate of molten steel supplied to the mold 30. Accordingly, the operation of the stopper can be controlled to adjust the amount of molten steel supplied to the mold 30 through the immersion nozzle 25.
  • a sliding gate (not shown) may be provided on the tundish 20 and the immersion nozzle 25.
  • the sliding gate can control the opening degree of the moving path of the molten steel formed in the immersion nozzle (25). Accordingly, the operation of the sliding gate can be controlled to adjust the amount of molten steel supplied from the tundish 20 to the mold 30.
  • the mold 30 may be located below the tundish 20.
  • the mold 30 is a frame for determining the appearance of a metal product by solidifying molten steel.
  • the mold 30 may include two long side plates disposed opposite to each other and two short side plates disposed to face each other between the two long side plates.
  • a space for accommodating molten steel between the long side plates and the short side plates is formed, and the upper and lower portions of the mold 30 can be opened.
  • a path through which cooling water circulates may be formed in at least part of the long-side plates and the short-side plates. Accordingly, the molten steel supplied into the mold 30 can be quickly solidified as heat is taken away by the cooling water.
  • the cooling base 40 may be located below the mold 30.
  • the cooling stand 40 may include a plurality of conveying rollers 45 arranged while forming a movement path of the casting and a cooling water injector (not shown) for injecting cooling water into the casting moving by the conveying rollers 45 .
  • the cooling stand 40 can perform a series of molding operations while cooling the casting strip that is pulled out from the mold 30 and moves.
  • FIG. 2 is a flowchart illustrating a method of manufacturing a steel material according to an embodiment of the present invention.
  • FIG. 3 is a view illustrating a process in which a thickened layer is formed on a steel material according to an embodiment of the present invention.
  • a method of manufacturing a steel material according to an embodiment of the present invention will be described.
  • a method of manufacturing a steel material includes the steps of providing a mold flux containing a weather resistant metal (S110), supplying molten steel into a mold (S120) (S130) of supplying mold flux (S130), and forming a thickened layer of weather-resistant metal on the outer layer of the steel by diffusion of a weather-resistant metal on the surface of the molten steel in the mold flux (S140).
  • a mold flux containing a weather resistant metal S110
  • at least one of copper (Cu), tin (Sn) and niobium (Nb) may be used as the weather resistant metal, and the steel may be a cast steel.
  • a mold flux to be used in a steel material manufacturing process can be prepared.
  • Weathering metals may have different melting points from molten steel. If the melting point of the weather-resistant metal is higher than the melting point of the molten steel, it may not be melted by the molten steel. Therefore, the weather-resistant metal may not melt in the molten steel, and the weather-resistant metal having a high melting point may adversely affect the casting process. Therefore, since the melting point of the weather-resistant metal must be lowered, the weather-resistant metal can be made into an oxide form and included in the mold flux. That is, the mold flux may include a composition containing an oxide of a weather-resistant metal, and when supplied to the molten steel, it may be easily melted by the heat of the molten steel to become a liquid phase.
  • the oxide of the weather-resistant metal at least one of copper oxide, tin oxide, and niobium oxide may be used.
  • Cu 2 O may be used as the copper oxide
  • SnO 2 may be used as the tin oxide
  • Nb 2 O 5 may be used as the niobium oxide.
  • the kind of oxide used is not limited to this and may be various.
  • at least one of SiO 2 , CaO, MgO, Al 2 O 3 , Na 2 O, and F may be further included in the mold flux.
  • the copper oxide When copper alone is used as the weather-resistant metal, the copper oxide is included in an amount of 2 to 40% by weight based on the total weight of the composition. When the composition contains less than 2% by weight of copper oxide, the densification of the oxide film formed by the weather-resistant gold stones on the surface of the steel can be reduced. Therefore, there is a problem that oxygen permeates between the oxide films formed on the surface of the steel material, and the inside of the steel material is easily corroded. If the composition contains more than 40% by weight of copper oxide, the mold flux is not easily melted in the molten steel, so that there is a problem that a thickened layer of weather-resistant metal can not be formed on the steel. Therefore, the content of the copper oxide in the mold flux can be controlled so that the mold flux can be easily melted by the molten steel while increasing the densification of the oxide film formed on the surface of the steel.
  • tin oxide When tin alone is used as the weather-resistant metal, tin oxide is included in an amount of from 1.1 to 40% by weight based on the total weight of the composition. If the composition contains less than 1.1% by weight of tin oxide, the amount of tin is small and an oxide film may not be formed on the surface of the steel. Therefore, there is a problem that the steel material is easily corroded.
  • the composition contains tin oxide in an amount of more than 40% by weight, the mold flux is not easily melted in molten steel, so that a thickened layer of weather-resistant metal can not be formed on the steel. Therefore, the content of the tin oxide in the mold flux can be controlled so that the mold flux can be easily melted by the molten steel while forming the oxide film on the surface of the steel.
  • the niobium oxide When niobium alone is used as the weather-resistant metal, the niobium oxide includes 1.3 wt% to 40 wt% with respect to the total weight of the composition. If the composition contains less than 1.3% by weight of niobium oxide, the amount of niobium may be small and an oxide film may not be formed on the surface of the steel. Therefore, there is a problem that the steel material is easily corroded. If the composition contains more than 40% by weight of niobium oxide, the mold flux is not easily melted in the molten steel, so that a thickened layer of weather-resistant metal can not be formed on the steel. Therefore, the content of the niobium oxide in the mold flux can be controlled so that the mold flux can be easily melted by the molten steel while forming the oxide film on the surface of the steel material.
  • the oxide of the weather-resistant metal may include two or more of copper oxide, tin oxide, and niobium oxide. That is, two or more of copper oxide, tin oxide, and niobium oxide may be used as an oxide of a weather-resistant metal. At this time, the oxide of the weather-resistant metal may be included in an amount of 5% by weight to 40% by weight with respect to the total weight of the composition.
  • the content of the oxide of the weather-resistant metal in the composition is less than 5% by weight, an oxide film is not formed on the surface of the steel, and the weatherability of the cast steel may not be improved. If the content of the oxide of the weather-resistant metal in the composition exceeds 40% by weight, there is a problem that the mold flux is not easily melted in the molten steel and is not dissolved in the molten steel in the mold flux. Therefore, the oxide content of the weather-resistant metal in the composition can be controlled so that the mold flux can be easily melted by molten steel to improve the weatherability of the steel.
  • the composition contained in the mold flux may further include a reducing material capable of reducing an oxide of a weather-resistant metal.
  • a reducing material capable of reducing an oxide of a weather-resistant metal.
  • Carbon can be used as a reducing material.
  • the carbon can reduce at least one of copper oxide, tin oxide, and niobium oxide as shown in the following formula (1).
  • At least one of copper, tin, and niobium may be present in the outer layer portion of the steel in the form of a metal rather than an oxide. Accordingly, the weather-resistant metal existing in the steel outer layer portion reacts with oxygen in the air over time, and an oxide film can be formed on the surface of the steel outer layer portion.
  • the amount of carbon contained in the composition can be controlled by the amount of the oxide of the weather-resistant metal contained in the composition.
  • the amount of carbon contained in the composition can be calculated by the following formula (2).
  • A is the content of copper oxide in the composition
  • B is the content of tin oxide in the composition
  • C is the content of niobium oxide in the composition.
  • the degree of increase of the content of carbon is larger than that of other metals.
  • the copper oxide is relatively reduced, a small number of carbon is required. Therefore, when the content of copper oxide in the composition is increased, the degree of increase in the content of carbon is smaller than that of other metals.
  • the amount of carbon in the composition is determined by the amount of the oxide of the weather-resistant metal, a suitable amount of carbon in the composition may be contained. Therefore, when the mold flux is prepared, the amount of the oxide of the weather-resistant metal contained is determined first, and the amount of carbon contained therein can be determined.
  • molten steel is supplied into the mold.
  • the molten steel M stored in the tundish can be injected into the mold 30 through the immersion nozzle 25 as shown in FIG. Accordingly, the molten steel M supplied into the mold 30 is solidified, and the steel material can be drawn to the lower portion of the mold 30.
  • the mold flux (F) is supplied to the molten steel (M).
  • the mold flux F may be supplied to the molten steel M in the mold 30 by using the mold flux supplier 50 located on the mold 30.
  • the mold flux F is supplied to the upper portion of the molten steel M and can be supplied between the wall of the mold 30 and the molten steel M.
  • the mold flux F can be melted by the temperature of the molten steel M and can be in a liquid state. Therefore, the mold flux F can lubricate between the mold 30 and the molten steel M, and the mold flux F can affect the solidification of the molten steel M.
  • the weather resistant metal of the mold flux (F) can be diffused to the interface of the molten steel (M) facing the wall of the mold (30). That is, by using carbon, the oxide of the weather-resistant metal can be reduced and the reduced weather-resistant metal can be diffused into the solidification structure of the surface of the molten steel (or the outer layer portion of the steel). Therefore, the weatherability of the outer layer portion of the steel material can be higher than that of the inner layer portion inside the outer layer portion. Therefore, a thickened layer of weather-resistant metal can be formed on the outer layer portion of the steel.
  • the steel material includes an inner layer portion B at the central portion and an outer layer portion A surrounding the periphery of the inner layer portion B. Since the inner layer portion B is located inside the steel material, it does not contact the weather-resistant metal supplied by the mold flux F. Therefore, in the inner layer portion B of the steel, the content of the weather-resistant metal is not controlled by the mold flux (F).
  • the outer layer portion A is a region from the inner layer portion to the surface of the steel material, and is a portion where the weather resistant metal can be diffused directly in contact with the mold flux F supplied to the molten steel M.
  • the weather-resistant metal in the mold flux F can be supplied to the outer layer portion A of the steel and the content of the weather-resistant metal in the steel outer layer portion A can be increased. That is, the entire outer layer portion A can be a weather-resistant metal-enriched layer having a higher content of weather-resistant metal than the inner layer portion B by the mold flux (F).
  • the outer layer portion may include 0.01 to 1% by weight of copper relative to the total weight of the steel material. If copper is contained in the outer layer portion at a level lower than 0.01 wt% than the inner layer portion, it means that the weather resistance metal is not properly supplied from the mold flux to the outer layer portion. Thus, the difference between the amount of copper contained in the inner layer portion and the amount of copper contained in the outer layer portion can be made too small. Therefore, the oxide film can not be stably formed on the outer layer portion, and the steel material can be easily oxidized.
  • the amount of copper contained in the outer layer portion can be adjusted so that the amount of copper oxide used for the mold flux becomes appropriate while the oxide film is stably formed in the outer layer portion.
  • the outer layer portion may contain 0.01 to 1% by weight of copper relative to the total weight of the steel.
  • the outer layer portion contains less than 0.01% by weight of copper, the densification of the oxide film formed on the surface of the steel can be reduced. Therefore, there is a problem that oxygen permeates between the oxide films formed on the surface of the steel material, and the inside of the steel material is easily corroded.
  • the content of copper oxide in the mold flux is increased to contain more than 1% by weight of the steel material in the outer layer portion, there is a problem that the mold flux is not easily melted in the molten steel. Therefore, the content of copper in the steel can be controlled so that the mold flux can be easily melted in the molten steel while increasing the densification of the oxide film formed on the surface of the steel.
  • the outer layer portion of the inner layer portion may further contain 0.009 wt% to 0.9 wt% of tin, based on the total weight of the steel material. If tin is further contained in the outer layer portion than the inner layer portion in an amount of less than 0.009 wt%, it means that the weather resistant metal is not properly supplied to the outer layer portion from the mold flux. Thus, the difference between the amount of tin contained in the inner layer portion and the amount of tin contained in the outer layer portion can be made too small. Therefore, the oxide film can not be stably formed on the outer layer portion, and the steel material can be easily oxidized.
  • the amount of the tin contained in the outer layer portion can be adjusted so that the amount of tin oxide used in the mold flux becomes appropriate while the oxide film is formed stably in the outer layer portion.
  • the outer layer portion may contain 0.005 to 0.9 wt% of tin, based on the total weight of the steel. If the outer layer portion contains less than 0.005 wt% tin, an oxide film formed on the surface of the steel may not be formed. Therefore, the surface of the steel is not protected by the oxide film, so that oxygen can easily penetrate and the steel material is easily corroded. If the content of tin oxide in the mold flux is increased to contain more than 0.9 wt% of tin in the steel, there is a problem that the mold flux is not easily melted in the molten steel. Therefore, the content of tin in the steel can be controlled so that the mold flux can be easily melted in the molten steel while forming the oxide film on the surface of the steel.
  • niobium In the outer layer portion than the inner layer portion, 0.009% by weight to 0.9% by weight of niobium may be further included in the total weight of the steel material.
  • niobium When niobium is contained in the outer layer portion of the inner layer portion at a level lower than 0.008 wt%, it means that the weather resistance metal is not properly supplied from the mold flux to the outer layer portion. Thus, the difference between the amount of tin contained in the inner layer portion and the amount of tin contained in the outer layer portion can be made too small. Therefore, the oxide film can not be stably formed on the outer layer portion, and the steel material can be easily oxidized.
  • niobium oxide in the mold flux is contained in the outer layer portion than in the inner layer portion, it means that an excessive amount of niobium oxide is contained in the mold flux. If the amount of the niobium oxide in the mold flux is too large, the mold flux may not easily melt in the molten steel. Thus, the amount of the niobium contained in the outer layer portion can be adjusted so that the oxide layer is formed stably in the outer layer portion, and the amount of the niobium oxide used in the mold flux becomes appropriate.
  • the outer layer portion may contain 0.005 to 0.8 wt% of niobium based on the total weight of the steel. If the outer layer portion contains less than 0.005% by weight of niobium, an oxide film formed on the surface of the steel may not be formed. Therefore, the surface of the steel is not protected by the oxide film, so that oxygen can easily penetrate and the steel material is easily corroded. If the content of tin oxide in the mold flux is increased to contain more than 0.8 wt% of niobium in the steel, there is a problem that the mold flux is not easily melted in the molten steel. Therefore, the content of niobium in the steel can be controlled so that the mold flux can be easily melted in the molten steel while forming the oxide film on the surface of the steel.
  • the thickness (X1 + X2) of the outer layer portion A may be 0.05% to 20% of the total thickness Y of the steel material.
  • the outer layer portion A can be removed in the step of rolling the steel material. That is, when the scale is removed from the surface of the steel material, the entire outer layer portion A can be removed with a scale, and there is no outer layer portion A of the steel material, so that the weatherability of the steel material can not be improved.
  • the thickness of the outer layer portion (A) exceeds 20%, the amount of the weather-resistant metal used to improve the weatherability of the steel material may increase. Therefore, the cost for improving the weather resistance of the outer layer portion A alone can be more than the cost of alloying the entire steel material and fabricating it as a weather-resistant steel. Therefore, in order to improve the weatherability of the steel material while reducing the manufacturing cost of the steel material, the thickness of the outer layer portion A can be controlled. At this time, the outer layer portion A may be a thickened layer of weather-resistant metal.
  • a thickened layer of weather-resistant metal can be formed on the surface of the steel. That is, the content of the weather-resistant metal used for improving the weatherability of the steel material can be controlled to be different between the outer layer portion and the inner layer portion of the steel material. Therefore, the weatherability of the surface of the steel material can be improved while reducing the amount of the weather-resistant metal used for improving the weatherability of the steel material in the casting step of the steel material. Therefore, the production cost of the steel material having weather resistance can be reduced, and the productivity of the steel material can be improved.
  • FIG. 4 is a view showing an outer layer portion of a steel material according to an embodiment of the present invention
  • FIG. 5 is a graph comparing a thickness reduction amount of a steel material according to an embodiment of the present invention and a steel material according to a comparative example.
  • an experiment for comparing the steel material according to the embodiments of the present invention and the steel material according to the comparative example will be described.
  • a cast steel was cast using a mold flux containing copper oxide according to the method of manufacturing steel according to Example 1 of the present invention.
  • the copper oxide was reduced by the carbon in the mold flux and concentrated in the solidification structure of the molten steel at the early stage of casting to form a thickened layer of copper on the surface of the steel.
  • 30% by weight of copper oxide was contained with respect to the total weight of the mold flux.
  • Example 2 of the present invention casting was performed using a mold flux containing tin oxide.
  • the tin oxide was reduced by the carbon in the mold flux and thickened in the solidification structure of the molten steel in the early stage of casting to form a thickened layer of tin on the surface of the steel.
  • tin oxide was contained in an amount of 10% by weight based on the total weight of the mold flux.
  • niobium oxide was reduced by the carbon in the mold flux and concentrated in the solidification structure of the molten steel at the initial casting stage to form a niobium enriched layer on the surface of the steel.
  • niobium oxide was contained in an amount of 10% by weight based on the total weight of the mold flux.
  • a steel material was cast using a mold flux not containing an oxide of a weather-resistant metal according to a general casting method. Since the oxide of the weather-resistant metal is not contained in the mold flux, a thickened layer of weather-resistant metal is not formed in the cast slab.
  • Table 1 is a table comparing the components contained in each of the inner layer portion and the outer layer portion of the steel material according to the examples and the steel material according to the comparative example.
  • Example 1 0.13 0.5 0.5 0.1 0.5 0.2 0.01 0.01 0.4 0.01 0.01
  • Example 2 0.14 0.4 0.5 0.1 0.5 0.2 0.01 0.01 0.11 0.01
  • Example 3 0.14 0.5 0.5 0.1 0.5 0.2 0.01 0.06 Comparative Example 0.13 0.5 0.5 0.1 0.5 0.2 0.01 0.01 0.01 0.01 0.01 0.01
  • the copper content of the outer layer portion of the steel material according to Example 1 was 0.4 wt%, which was higher than those of the other Examples and Comparative Examples.
  • the copper content of the outer layer portion of the cast steel according to Example 1 was higher appear. Therefore, it can be confirmed that the concentrated layer of copper is formed in the outer layer portion A of the steel material according to the first embodiment as shown in Fig. 4 (a). At this time, the color of the outer layer portion A is indicated darker than that of the inner layer portion B, and the content of copper in the outer layer portion A is higher than that of the inner layer portion B.
  • the tin content of the outer layer portion of the steel material according to Example 2 was 0.11 wt%, which was higher than those of the other Examples and Comparative Examples.
  • the tin content of the outer layer portion of the cast steel according to Example 2 was higher than that of the inner layer portion.
  • a thickened layer of tin is formed in the outer layer portion of the steel material according to the second embodiment as shown in Fig. 4 (b).
  • the color of the outer layer portion A is shown to be darker than that of the inner layer portion B, and the content of tin in the outer layer portion A is higher than that of the inner layer portion B.
  • the niobium content of the outer layer portion of the steel material according to Example 3 was 0.06 wt%, which was higher than those of the other Examples and Comparative Examples.
  • the niobium content of the outer layer portion of the steel material according to Example 3 was higher than that of the inner layer portion.
  • 4 (c) it can be confirmed that the niobium enriched layer is formed in the outer layer portion of the steel material according to the third embodiment. At this time, the color of the outer layer portion A is shown to be lighter than that of the inner layer portion B, and the content of niobium in the outer layer portion A is higher than that of the inner layer portion B.
  • the contents of Cu, Sn, and Nb were measured in the outer layer portion and the inner layer portion of the steel in the same manner. Thus, it can be confirmed that no additional metal-enriched layer is formed in the steel according to the comparative example.
  • a wet dry corrosion test was conducted to evaluate the weatherability of each steel material.
  • the rust was removed from the surface corrosion part of the steel by using an aqueous solution containing hydrochloric acid, and the weight of the steel before and after the test was compared to the thickness, and the decrease amount was measured.
  • the thickness reduction amount of the steel according to the comparative example was 14 ⁇ m.
  • the steel strip according to Example 1 showed a thickness reduction of 8 ⁇ m
  • the steel strip according to Example 2 had a thickness reduction of 9 ⁇ m
  • the steel strip according to Example 3 had a thickness reduction of 10 ⁇ m appear.
  • the steel material according to the embodiments has a smaller thickness reduction amount than the steel material according to the comparative example. Therefore, it can be confirmed that the steel material formed with the thickened layer of weather-resistant metal according to the embodiments is superior in weatherability to the steel material according to the comparative example.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

La présente invention concerne un procédé de fabrication de matériau en acier pour la fabrication d'un matériau en acier, comprenant les étapes consistant à : préparer un flux de moule contenant un métal résistant aux intempéries; envoyer de l'acier fondu dans un moule; fournir le flux de moule à l'acier fondu; et former d'une couche épaissie du métal résistant aux intempéries sur une partie de couche externe du matériau d'acier par diffusion d'un métal résistant aux intempéries sur la surface de l'acier fondu dans le flux de moule, la couche épaissie du métal résistant aux intempéries étant formée sur la surface du matériau en acier, ce qui permet d'améliorer la résistance aux intempéries du matériau en acier.
PCT/KR2018/014467 2017-11-24 2018-11-22 Flux de moule, matériau en acier et procédé de fabrication de matériau en acier WO2019103494A1 (fr)

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KR10-2017-0158702 2017-11-24
KR1020170158702A KR102034424B1 (ko) 2017-11-24 2017-11-24 몰드플럭스, 강재, 및 강재 제조방법

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07276019A (ja) * 1994-04-01 1995-10-24 Nippon Steel Corp 含Ｃｕ，Ｓｎ鋼の連続鋳造パウダー
KR20040059354A (ko) * 2002-12-28 2004-07-05 주식회사 포스코 니오븀(Ｎｂ)첨가 강의 연속주조주편의 코너크랙 저감방법
JP2006289383A (ja) * 2005-04-06 2006-10-26 Sumitomo Metal Ind Ltd 鋼の連続鋳造用モールドフラックス。
KR20130073355A (ko) * 2011-12-23 2013-07-03 주식회사 포스코 용융 몰드 플럭스를 이용한 고속 주조 방법
KR20160130648A (ko) * 2015-05-04 2016-11-14 주식회사 포스코 몰드 플럭스 및 이를 이용한 연속 주조 방법 및 이로 제작된 주편

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3568760B2 (ja) 1997-06-24 2004-09-22 株式会社神戸製鋼所 裸耐候性と溶接性に優れた厚板
JP3785271B2 (ja) 1997-10-01 2006-06-14 新日本製鐵株式会社 高溶接性高耐候性鋼
JP5879758B2 (ja) 2011-06-08 2016-03-08 新日鐵住金株式会社 耐食性に優れた鋼材

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07276019A (ja) * 1994-04-01 1995-10-24 Nippon Steel Corp 含Ｃｕ，Ｓｎ鋼の連続鋳造パウダー
KR20040059354A (ko) * 2002-12-28 2004-07-05 주식회사 포스코 니오븀(Ｎｂ)첨가 강의 연속주조주편의 코너크랙 저감방법
JP2006289383A (ja) * 2005-04-06 2006-10-26 Sumitomo Metal Ind Ltd 鋼の連続鋳造用モールドフラックス。
KR20130073355A (ko) * 2011-12-23 2013-07-03 주식회사 포스코 용융 몰드 플럭스를 이용한 고속 주조 방법
KR20160130648A (ko) * 2015-05-04 2016-11-14 주식회사 포스코 몰드 플럭스 및 이를 이용한 연속 주조 방법 및 이로 제작된 주편

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KR20190060469A (ko) 2019-06-03

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