WO2017204379A1 - Tuyau et procédé pour sa fabrication - Google Patents

Tuyau et procédé pour sa fabrication Download PDF

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Publication number
WO2017204379A1
WO2017204379A1 PCT/KR2016/005542 KR2016005542W WO2017204379A1 WO 2017204379 A1 WO2017204379 A1 WO 2017204379A1 KR 2016005542 W KR2016005542 W KR 2016005542W WO 2017204379 A1 WO2017204379 A1 WO 2017204379A1
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WO
WIPO (PCT)
Prior art keywords
slag
pipe
weight
temperature
composition
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PCT/KR2016/005542
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English (en)
Korean (ko)
Inventor
윤희수
윤미정
Original Assignee
동도바잘트산업(주)
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Priority to PCT/KR2016/005542 priority Critical patent/WO2017204379A1/fr
Publication of WO2017204379A1 publication Critical patent/WO2017204379A1/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
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/12—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on oxides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/02—Rigid pipes of metal

Definitions

  • the present invention relates to a pipe and a method for manufacturing the same, and more particularly, to a method for producing a pipe having excellent wear resistance and corrosion resistance by utilizing slag generated in various processes of an ironworks and industrial by-products generated in a thermal power plant. will be.
  • the steel industry consumes a large amount of raw materials and energy to produce steel and goes through complex connection production systems such as raw materials, steelmaking, steelmaking, and rolling. These by-products and waste account for 65% of the main product steel. About 80% of the solid by-products and wastes are slag, and the remainder is by-products from thermal power plants. These industrial by-products have a high iron content, which can be used as a resource.
  • steel slag of 100 to 500 kg is generated in the process of producing one ton of steel.
  • ferronickel (Fe-Ni) slag is generated in excess of 1 million tons per year (expected to generate 2 million tons per year in future facility expansion), and fly ash, an industrial by-product, is estimated at 1.3 million tons per year based on Hadong thermal power plant. ton) error occurs.
  • the slag generated in this way is dumped in the yard and cooled and solidified in the air with a large amount of waterproofing.
  • the solidified slag mass is recycled as cement raw materials or landfilled according to market conditions.
  • high value-added or the creation of the use as a raw material is not well.
  • Basalt pipe
  • Basalt pipe
  • Basalt pipe
  • Basalt is a granite type of basalt melted at a high temperature of more than 1280 °C, cast into a pipe-shaped product through centrifugal casting, through a cooling pattern It is produced by recrystallization.
  • Basalt pipes are used in transport pipelines such as air pressure and water pressure in industries such as steel mills, power plants, and gas plants because of their excellent wear resistance and corrosion resistance.
  • the present invention provides a pipe and a method for manufacturing the same, which can replace the basalt pipe by increasing the strength and wear resistance by utilizing various slag and industrial by-products.
  • the present invention suppresses or prevents the use of basalt which is a natural ore, and provides a pipe having a crystalline phase of a fluorine system, that is, an augite and enstatite crystal phase and a method of manufacturing the same.
  • the present invention provides a pipe and a method of manufacturing the same that can reduce the cost of waste by treating by-products.
  • Pipe according to an embodiment of the present invention is a pipe, the pipe body is produced by mixing three kinds of slag and one industrial by-product generated in the steel production process, the pipe body is 45 to 55% by weight of silicon dioxide (SiO 2), Main components of 10 to 15 wt% iron oxide (Fe2O3), 10 to 15 wt% aluminum oxide (Al2O3), 8 to 13 wt% calcium oxide (CaO) and 10 to 15 wt% magnesium oxide (MgO) And other unavoidably mixed impurities.
  • SiO 2 silicon dioxide
  • Fe2O3 iron oxide
  • Al2O3 aluminum oxide
  • CaO calcium oxide
  • MgO magnesium oxide
  • the slag includes ferronickel slag, Tallinn slag and converter slag, and the industrial by-products may comprise fly ash.
  • the ratio of the ferronickel slag, the Tallinn slag, the converter slag and the fly ash is in weight percent, 33 to 38 weight percent, 5 to 10 weight percent, 15 to 20 weight percent, and 35 to 45 weight percent, respectively. Can be combined.
  • the pipe body may comprise a crystalline phase of a fluorine system.
  • the pipe body may comprise an augite or enstatite crystalline phase.
  • Pipe manufacturing method the process of preparing three kinds of slag and one industrial by-products generated during the production process of steel, the process of measuring the slag and the by-products and controlling the composition ratio, the slag and the by-products It includes the step of blending, the process of melting the composition, the process of insulating the melt, the process of centrifugal casting the melt in the form of a pipe and the process of heat-treating the molding.
  • the slag includes ferronickel slag, Tallinn slag, converter slag, the by-products include fly ash, the composition may be used in combination with the ferronickel slag, the Tallinn slag, the converter slag and the fly ash. .
  • the process of controlling the composition ratio is 45 to 55% by weight of silicon dioxide (SiO2), 10 to 15% by weight of iron oxide (Fe2O3), 10 to 15% by weight of aluminum oxide (Al2O3), 8 to 13% by weight of calcium It may be controlled to contain an oxide (CaO) and 10 to 15% by weight of magnesium oxide (MgO).
  • the process of insulating the melt may be performed in the range of 1150 to 1250 °C.
  • the centrifugal casting process may be performed by injecting the melt into a mold and preheating the mold before injecting the melt.
  • the preheating temperature range of the mold may be 300 to 400 ° C.
  • the centrifugal casting process may include the step of cooling the inside of the mold during the casting of the melt.
  • the molded article may be taken out from the centrifugal caster in the temperature range of 900 to 1100 °C.
  • the heat treatment process may include an annealing step of maintaining the molding at a crystallization temperature (880 ° C.) or less.
  • the heat treatment process may include a sub annealing step of maintaining the molding at a temperature above the glass transition temperature (710 ° C.) before the annealing step.
  • the molding may be cooled at a rate of 0.5 to 1.0 °C per minute.
  • the annealing temperature is in a range from 100 ° C. lower than the crystallization temperature to the crystallization temperature, and the sub annealing temperature is in a range from 20 ° C. higher than the glass transition temperature to 50 ° C. higher than the glass transition temperature. Can be.
  • the crystal phase ie, augite ( Abrasion and corrosion resistance pipes having augite and enstatite are prepared.
  • FIG. 1 is a flowchart sequentially illustrating a pipe manufacturing method according to an embodiment of the present invention.
  • FIG. 2 is a view schematically illustrating a pipe manufacturing method of FIG. 1.
  • FIG 3 is a view showing a raw material composition ratio and the treatment state of the composition according to an embodiment of the present invention.
  • FIG. 4 is a graph showing the TG-DTA pattern of the pipe composition according to an embodiment of the present invention.
  • FIG. 5 is a graph illustrating a heat treatment pattern according to an exemplary embodiment of the present invention.
  • FIG. 6 is a table showing the strength and wear characteristics of the embodiment of the present invention and the conventional pipe.
  • FIG. 7 is a photograph showing a pipe according to an embodiment of the present invention.
  • FIG. 1 is a flowchart sequentially illustrating a pipe manufacturing method according to an embodiment of the present invention.
  • FIG. 2 is a view schematically illustrating a pipe manufacturing method of FIG. 1.
  • 3 is a view showing a raw material composition ratio and the treatment state of the composition according to an embodiment of the present invention.
  • Figure 3 (a) is a view showing the composition range of the composition according to an embodiment of the present invention
  • Figure 3 (b) is a view showing the content range of the raw material for constituting the composition
  • Figure 3 (c ) Is a view showing the details of the processing of each step of the pipe manufacturing method according to an embodiment of the present invention.
  • 4 is a graph showing the TG-DTA pattern of the pipe composition according to an embodiment of the present invention.
  • 5 is a graph illustrating a heat treatment pattern according to an exemplary embodiment of the present invention.
  • 6 is a table showing the strength and wear characteristics of the embodiment of the present invention and the conventional pipe.
  • FIG. 7 is a photograph showing a pipe according to an embodiment of the present invention.
  • Pipe (P) is produced by mixing three kinds of slag and one industrial by-product, that is, four kinds of raw materials generated during the production process of steel, made of a pipe body for use in various piping lines do.
  • the composition is prepared by making the slag and industrial by-products in powder form, and blending the raw materials in a set ingredient ratio. This is because the composition ratio of the composition is set so that the pipe to be manufactured has a crystalline phase of a fluorine system, that is, an augite or enstatite crystalline phase.
  • Slag is a substance produced by-product from the manufacture of steel products from natural resources such as iron ore, coal and limestone.
  • the slag used in the embodiment of the present invention is a ferronickel slag (Fe-NiSlag) by-produced in the alloy manufacturing process of iron and nickel, and a delineation process for removing phosphorus (P) contained in the steel and the iron of the converter.
  • Fe-NiSlag ferronickel slag
  • P phosphorus
  • ferronickel slag and converter slag are components that are inevitably contained such as other components or impurities in addition to the main components, such as fluorine (F), phosphorus pentoxide (P 2 O 5 ), chrome ocher (Cr 2 O 3 ), and nickel oxide (NiO). ), Copper oxide (CuO), zinc oxide (ZnO), strontium oxide (SrO), zirconium oxide (ZrO 2 ), niobium pentoxide (Nb 2 O 5 ), sulfur (P), carbon (C) and the like. have.
  • Fly ash is a particulate industrial by-product collected by a dust collector of a pulverized coal combustion boiler among coal ashes generated from a coal-fired power plant that burns crushed coal.
  • the main components are SiO 2 , Al 2 O 3 , glassy, and have a spherical particle shape. Fly ash can also be mixed with cement and used as fly ash cement.
  • each slag and fly ash is a major component of the Basalt product: silicon dioxide (SiO 2 ), iron oxide (Fe 2 O 3 ), aluminum oxide (Al 2 O 3 ), calcium oxide (CaO) and magnesium oxide (MgO). ) Main components, and the content of the main component is different depending on the raw materials.
  • composition of the raw materials is important is that the composition of the four raw materials is set so that a pipe having a crystalline phase (i.e., augite or enstatite) of a whitish line similar to that of the Basalt product is produced. This is because the composition ratio of the main elements to be controlled. Thus, the composition ratio of the main elements will be described in detail below.
  • composition manufactured by mix blending ferronickel slag, Tallinn slag, converter slag, and fly ash is demonstrated.
  • the weight ratio of the composition used to prepare the pipe (P) of the present invention is a ratio of ferronickel slag, thallin slag, converter slag and fly ash to the total composition.
  • Compositions are prepared by blending in proportions of 33 to 38 weight percent, 5 to 10 weight percent, 15 to 20 weight percent, and 35 to 45 weight percent, respectively, based on weight.
  • composition ratio of each raw material is 45 to 55% by weight of silicon dioxide (SiO 2 ), 10 to 15% by weight of iron oxide (Fe 2 O 3 ), 10 to 15% by weight of aluminum oxide (Al 2 O 3 ) %, Calcium oxide (CaO) is 8 to 13% by weight, magnesium oxide (MgO) is contained 10 to 15% by weight.
  • Silicon Dioxide SiO 2
  • silicon dioxide SiO 2
  • the glass contains a large amount of glass to reduce the strength. Therefore, 45 to 55% by weight may be contained.
  • Iron oxide Fe 2 O 3
  • Iron oxide functions as an inoculum for nucleation and affects the strength of the product. In this case, when iron oxide is included in less than 10% by weight, nucleation is insignificant, and if it is included in an amount of more than 15% by weight, cracks may occur in the manufacturing process or after the production. Thus, iron oxide in the total composition of the composition may contain 10 to 15% by weight.
  • Aluminum oxide affects the function of lowering the melting point of the composition and the viscosity when the composition is in the molten state. In this case, when the aluminum oxide is included in less than 10% by weight it is difficult to reduce the melting point of the composition is not easy to melt the composition, if contained in more than 15% by weight the viscosity of the composition rises causing a problem that causes deformation in the product .
  • the aluminum oxide in the total composition of the composition may contain 10 to 15% by weight.
  • Calcium oxide (CaO) and magnesium oxide (MgO) are included in the composition to adjust the basicity.
  • the calcium oxide is 8 to 8 based on the total weight of the composition controlled to have a crystalline phase similar to that of a conventional basalt pipe. 13% by weight, magnesium oxide may be contained from 10 to 15% by weight.
  • calcium oxide and magnesium oxide may be contained in the said range.
  • the pipe (P) manufactured by mixing four kinds of raw materials to control the composition ratio of the main components shows a crystalline phase of a fluorine system similar to that of the basalt, that is, an augite crystalline and an enstatide crystalline phase.
  • the pipe manufacturing method is the process of preparing three types of slag and industrial by-products generated during the production process of steel, the process of measuring the slag and by-products and controlling the composition ratio, slag And blending the by-products, melting the composition, insulating the melt, centrifugal casting the melt into a pipe shape, and heat-treating the molding.
  • ferronickel slag, Tallinn slag and converter slag generated during the production process of steel, and the moisture contained in the fly ash generated in the thermal power plant to prepare the raw material by drying at 100 °C or more ferronickel slag, Tallinn slag, converter slag and fly ash is prepared in the form of a powder (S100).
  • the ferronickel slag is less than 30mm on average, and slag such as Tallinn slag and converter slag are in the form of agglomerates, and may be prepared to have a powder form by pulverizing to a predetermined particle size (eg, within 5mm) through a grinding process.
  • fly ash is in the form of a powder may not require a special grinding or separation process.
  • the raw material provided in powder form is measured and the composition ratio is controlled (S200). For example, 33 to 38% by weight of the powder of ferronickel slag, 5 to 10% by weight of the powder of Tallinn slag, 15 to 20% by weight of the powder of converter slag, 35 to 35% by weight of the ash ply, based on the weight of the total composition.
  • the raw material is To mix (S300). For example, a total of four types of ferroelectric slag, Tallinn slag, converter slag and fly ash, each prepared in powder form, may be introduced into the kneader and blended in the basic mixing ratio described above.
  • the composition is charged into the melting furnace, and after the temperature of the melting furnace is raised to the complete melting temperature of the composition, the composition is completely melted (S400). At this time, the composition is charged to the melting furnace 100 heated to a temperature of 200 °C or more, the melting furnace 100 is heated to 1400 °C or more for complete melting to completely melt the composition and homogenize.
  • the outflow may be based on the melting point of the raw materials constituting the composition to determine the complete melting temperature.
  • the melting point of ferronickel slag is 1410 ° C
  • the melting point of Tallinn slag is 1350 ° C
  • the melting point of converter slag is 1380 ° C
  • the melting point of fly ash is 1385 ° C. Therefore, in the embodiment of the present invention, all four kinds of raw materials were set at a temperature of 1400 ° C. or higher capable of completely melting.
  • the process of warming before tapping the melt is performed (S500).
  • the melt may be insulated in the thermal furnace 200 having a size of a predetermined capacity maintained in the temperature range of 1150 to 1250 °C.
  • This warming temperature range is an optimal condition in which iron oxide (Fe 2 O 3) in the melt can act as a nucleation site, and the warming temperature is in the above range because it is easy to crystallize to the inside and the surface of the pipe.
  • the melt is introduced into a casting machine having a shape to be manufactured to centrifugally cast the pipe (S600).
  • the melt may be directly tapped from the thermal furnace 200, or introduced into the centrifugal casting machine 400 using the simple ladle 300 in the middle of the thermal furnace 200 and the mold 400.
  • the centrifugal casting method may be manufactured in a pipe shape by extruding the melt introduced by using any one of casting methods such as true centrifugal casting, semicentrifugal casting, and centrifuging.
  • the centrifugal casting method makes a pipe using inertial force by rotation, and injects molten metal into a cylindrical mold rotating at high speed so that the melt is uniformly adhered to the inner surface of the cylinder by centrifugal force to become a hollow hollow casting.
  • the rotational speed of the centrifugal casting may have a range of 600 to 700 rpm so that thermal deformation does not occur depending on the thickness of the pipe.
  • the mold (mold) of the centrifugal casting machine 400 has a cylindrical tube shape for casting the pipe (P), the inside is made of a refractory to withstand high temperature melt, the outside is made of a metal material such as cast iron Can be.
  • the mold and the inlet of the mold may be preheated to 300 to 400 ° C., and then the melt may be injected. This is because glass may be formed on the surface of the pipe due to the difference between the temperature of the melt flowing into the mold and the surface temperature of the mold and the inlet, thereby reducing the strength and wear resistance of the pipe.
  • the inside of the tubular mold may be cooled in order to prevent or prevent the pipe crack and the flow of the inner and outer surfaces due to the temperature difference between the melt and the mold itself.
  • various methods may be used for cooling the mold, and for example, the inner surface of the mold may be uniformly cooled by spraying water or gas with a porous injection nozzle.
  • the molding when the molding reaches the desired shape may be included to separate the molding from the centrifugal casting mold in the range of 900 to 1100 °C to prevent cracking and dripping of the pipe.
  • the molding is subjected to a heat treatment process in the heat treatment furnace (S700).
  • the heat treatment process may include an annealing step of maintaining at a temperature below the crystallization temperature of the molding. It may also include a sub annealing step that maintains the molding at a temperature above the glass transition temperature prior to the annealing step.
  • the holding time of the annealing or sub annealing is proportional to the thickness of the molding, and after the heat treatment, the molding is cooled at a rate of 0.5 to 1.0 ⁇ per minute.
  • the annealing temperature is in the range from 100 ° C. lower than the crystallization temperature to the crystallization temperature, and the sub annealing temperature is in the range from the glass transition temperature to the temperature 20 to 50 ° C. higher than the glass transition temperature.
  • the annealing is carried out above the crystallization temperature, there may be a problem that the strength of the product is weak due to the excessive growth of the crystal.
  • the possibility of a large amount of glass formed in the tissue increases, which may weaken the strength of the product.
  • the Fusion-CAST method may be used as the heat treatment method of the annealing step
  • the glass ceramics method may be used as the heat treatment method of the sub annealing step and the annealing step.
  • thermal analysis was performed as shown in FIG.
  • Thermal analysis was performed on TG (thermorgravimetre) and DTA (differential thermeral analylsis). That is, the glass transition temperature and the crystallization temperature as shown in FIG. 4 can be observed while observing the temporal change in temperature while measuring the temperature of the composition.
  • the glass transition temperature of the composition is around 710 ° C. and the crystallization temperature is around 880 ° C.
  • the glass transition temperature refers to the center of the temperature range where an amorphous solid changes from a soft state, such as glass, to a viscous state, and the crystallization temperature (Tc) is the peak at which the rate at which crystals are formed is maximum. It means the temperature at the pole.
  • FIG. 5 a graph of each of the glass ceramics method and the Fusion-CAST method is shown.
  • Fusion-CAST method is a heat treatment process in which the fully melted melt and molds of various shapes are held together at a temperature below the crystallization temperature in a heat treatment furnace for 1 to 6 hours and then cooled to 200 ° C. at 0.5 to 1 ° C. or less per minute. Proceed.
  • a heat treatment process is cooled to 200 °C to 0.5 to 1 °C or less per minute. It does not have a sub annealing temperature, the heat treatment process proceeds only at the annealing temperature.
  • the fully melted melt and the molds of various shapes are held together for 1 hour at a glass transition temperature or higher in a heat treatment furnace, and then again heated to a temperature below the crystallization temperature, and maintained for 1 to 6 hours, and then 0.5 to 1 per minute.
  • the heat treatment process is cooled to 200 ° C. or below.
  • the temperature is again raised to a temperature of 780 °C and maintained for 1 to 6 hours, it can be proceeded to a heat treatment process is cooled to 200 °C to 0.5 to 1 °C or less per minute. That is, the heat treatment process proceeds to the sub annealing temperature and the annealing temperature.
  • the time maintained at a temperature near the crystallization temperature is proportional to the thickness of the pipe to be manufactured.
  • the retention time can be determined as about 3 hours for a thickness of 20 mm.
  • the pipe is taken out of the heat treatment furnace 500 at a temperature of 100 ° C or less. This is preferably taken out below the temperature in order to prevent or prevent the pipe property from changing due to a sudden temperature change.
  • the pipe can then be surface finished with a diamond grinder. Referring to Figure 6, it can be seen a table comparing the compressive strength and wear rate of the final production pipe and the conventional Basalte pipe.
  • the compressive strength means the maximum compressive stress that can be tolerated without breaking the material.
  • the Basalt pipe has a compressive strength of 300 MPa and the wear rate is close to 1.0%.
  • the compressive strength of the pipe (P) according to an embodiment of the present invention shows a compressive strength of 300 to 450 MPa, the wear rate represents a value of 0.5 to 1.0%.
  • the pipe P of FIG. 7 fabricated using slag and fly ash exhibits a similar or higher compressive strength as that of a conventional apelalt pipe and a wear rate similar to or lower than that of a bazaar pipe. It replaces pipes and can be used in applications requiring higher compressive strength than conventional tiles.
  • Pipe and pipe manufacturing method by using the ferronickel slag, Tallinn slag and converter slag generated in the steel production process and fly ash, which is an industrial by-product of the fluorite system similar to the composition of the conventional bazaar pipe It can have a crystalline phase and can replace the basalt pipe.
  • basalt which is a natural ore conventionally used in the fabrication of basalt pipes, and to reduce the burden on the raw materials of imported high strength pipes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

La présente invention concerne un tuyau et un procédé pour sa fabrication. Un corps de tuyau est fabriqué par le mélange de trois types de laitiers générés pendant un processus de réalisation d'acier avec un type de sous-produit industriel, lequel tuyau contient de 45 à 55 % en poids de dioxyde de silicium (SiO2), de 10 à 15 % en poids d'oxyde de fer (Fe2O3), de 10 à 15 % en poids d'oxyde d'aluminium (Al2O3), de 8 à 13 % en poids d'oxyde de calcium (CaO) et de 10 à 15 % en poids d'oxyde de magnésium (MgO) comme composants principaux, et des impuretés mélangées de façon inévitable. Un tuyau présentant une excellente résistance à l'usure et une excellente résistance à la corrosion peut être fabriqué par l'intermédiaire des étapes consistant : à préparer trois types de laitiers générés pendant un processus de réalisation d'acier, et un type de sous-produit industriel ; à mesurer le laitier et le sous-produit, et contrôler le rapport de composition de ces derniers ; à mélanger le laitier et le sous-produit ; à faire fondre la composition ; à isoler thermiquement le matériau fondu ; à couler par centrifugation le matériau fondu sous la forme d'un tuyau ; et à recuire l'article moulé.
PCT/KR2016/005542 2016-05-25 2016-05-25 Tuyau et procédé pour sa fabrication WO2017204379A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110756759A (zh) * 2018-07-28 2020-02-07 席文君 利用钢渣离心铸造复合钢管的方法和复合钢管

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Publication number Priority date Publication date Assignee Title
US20070181201A1 (en) * 2003-11-19 2007-08-09 Rocla Pty Ltd Cementitious pipes
KR101526442B1 (ko) * 2014-01-27 2015-06-05 주식회사 포스코 파이프 및 이의 제조 방법
KR20150089297A (ko) * 2014-01-27 2015-08-05 주식회사 포스코 타일 및 이의 제조 방법
KR101590992B1 (ko) * 2014-08-14 2016-02-18 주식회사 포스코 부산물을 이용한 성형체 제조방법, 그 성형체 및 결합재
KR101584749B1 (ko) * 2014-10-13 2016-01-13 주식회사 삼원 고로 슬래그를 포함한 프로브용 내열 조성물 및 이를 이용하여 제조된 내열 보호관

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CN110756759A (zh) * 2018-07-28 2020-02-07 席文君 利用钢渣离心铸造复合钢管的方法和复合钢管

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