CN114292117A - Continuous casting three major pieces for high-performance steel of tundish and preparation method thereof - Google Patents
Continuous casting three major pieces for high-performance steel of tundish and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 79
- 239000010959 steel Substances 0.000 title claims abstract description 79
- 238000009749 continuous casting Methods 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 84
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 66
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 66
- 239000002994 raw material Substances 0.000 claims abstract description 45
- 239000002893 slag Substances 0.000 claims abstract description 41
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- 238000007654 immersion Methods 0.000 claims abstract description 8
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- 239000002245 particle Substances 0.000 claims description 3
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- 238000003672 processing method Methods 0.000 claims 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 45
- 239000011029 spinel Substances 0.000 abstract description 18
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- 239000000463 material Substances 0.000 description 9
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- 230000035939 shock Effects 0.000 description 5
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
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Abstract
The invention discloses a continuous casting three major parts for tundish high-performance steel, which comprises a long nozzle, a stopper rod and an immersion nozzle, wherein fused magnesia-alumina spinel (MgO. Al2O3) is used to take alumina high-purity light-burned magnesia as a raw material, and the fused magnesia-alumina spinel is obtained by cooling and crushing after being melted at a high temperature of more than 2000 ℃ in an electric arc furnace, so that the fused magnesia-alumina spinel is a novel high-purity synthetic refractory raw material with low impurity content. The fused magnesia-alumina spinel has large volume density and high melting point, can keep better chemical stability in high-oxygen or reducing atmosphere, and has strong capability of resisting the erosion of molten steel and molten slag under the action of high temperature. In addition, the fused magnesia-alumina spinel has firm structure, small thermal expansion coefficient and isotropy. The invention aims to provide three continuous casting pieces for tundish high-performance steel and a preparation method thereof, which can meet the requirements of high-performance steel casting, have long service life, reduce impurities, reduce production cost and reduce consumption of per ton of steel refractory.
Description
Technical Field
The invention relates to the field of refractory materials taking inorganic materials as base materials, in particular to three continuous casting pieces for tundish high-performance steel and a preparation method thereof.
Background
The development of steel production in China is in the key period of structure adjustment and optimization, and the high-efficiency continuous casting technology, the near-net-shape continuous casting technology and the high-performance steel and high-cleanliness steel continuous casting technology are the core for promoting the steel-making production to be fast and efficient. Under the situation that the steel industry in China has been gradually changed from simple quantity growth to quality benefit growth, the nation has established that the key point of the development of the steel industry in China is high-efficiency continuous casting and the production of high-quality high-added-value high-performance clean steel.
Continuous casting of high-performance clean steel is aimed at producing high-quality steel, and is a common working target of steel mills and continuous casting refractory material mills, wherein functional continuous casting 'three-piece' products matched with molten iron pretreatment, steelmaking, refining and continuous casting are involved. The protective pouring adopted in the casting process is particularly important for producing high-performance clean steel.
Domestic high-performance high-oxygen steel and enamel steel belong to ultra-low carbon steel, the control requirement on the carbon content of molten steel is very high, and if the carbon content exceeds the standard, only degradation treatment can be performed. During the production of high-oxygen enamel steel, the carbon content exceeds the standard frequently, and the reason is mainly that three continuous casting functions such as a long nozzle, a stopper rod and the like have large erosion resistance of materials, so that the recarburization of molten steel is caused. Therefore, it is necessary to develop a technique for reducing erosion of continuous casting functional refractory materials such as a long nozzle and a stopper and for reducing carburization of molten steel. The service life of three continuous casting parts produced by adopting common domestic processes and materials is only 1 heat. The production rhythm is not good, and the production cost and the consumption of ton steel refractory material are high.
Along with the requirement of domestic major steel mills on smelting of high-performance steel such as silicon steel, automobile plates and the like, particularly, the tundish continuous casting time is longer and longer as the Bao steel is required, and the continuous casting functional refractory material cannot be damaged or replaced midway, so that nitrogen increase and oxygen absorption of molten steel are prevented. At present, three main continuous casting pieces used by the Bao steel high-performance steel mainly depend on imported Japanese Kawasaki, Aurea and the like, the bargaining right and the supply chain of the Bao steel high-performance steel are mastered by the three pieces, and the Bao steel high-performance steel is very unfavorable for steel smelting in China. Therefore, in order to realize the localization and localization of the high-grade refractory materials, repeated certification is carried out by our company, and the research and development of the project of three high-performance Bao steel continuous casting are determined, so that the service life of the three continuous casting pieces is prolonged, the molten steel inclusion is reduced on the basis of ensuring the thermal shock stability and molten steel corrosion resistance, the requirement of high-quality steel is met, and the development of the continuous casting three high-grade refractory materials is instructive.
Disclosure of Invention
In order to solve the problems, the invention aims to provide three continuous casting pieces for high-performance steel in a tundish and a preparation method thereof, which can achieve the aims of meeting the requirements of high-performance steel casting, prolonging service life, reducing impurities, reducing production cost and reducing consumption of refractory materials per ton of steel.
According to one aspect of the invention, three main parts for continuous casting of tundish high-performance steel are provided, including a long nozzle, a stopper rod and a submerged entry nozzle, and are characterized in that the body of the long nozzle consists of 60-75% of Al203, 6-10% of Si02 and 20-24% of F.C, the slag line of the long nozzle consists of 37-42% of Al203, 32-37% of Mg0 and 17-23% of F.C, and the lining of the long nozzle consists of 70-80% of Al203, 10-15% of Mg0, 0-5% of Si02 and 0-4% of F.C;
the stopper rod comprises a body, a slag line and a head, wherein the body of the stopper rod consists of 62-67% of Al203, 6-10% of Mg0, 0-6% of Si02 and 12-18% of F.C in percentage by weight, the slag line of the stopper rod consists of 55-60% of Al203, 32-37% of Mg0 and 17-24% of F.C, and the head of the stopper rod consists of 65-72% of Al203, 14-18% of Mg0 and 8-11% of F.C;
the submerged nozzle comprises a body, a lining and a discharge port, wherein the body of the submerged nozzle comprises, by weight, 60% -65% of Al203, 6% -10% of Si02 and 20% -25% of F.C, a slag line of the submerged nozzle comprises 79% -94% of Zr02 and 8% -11% of F.C, a lining of the submerged nozzle comprises 70% -80% of Al203, 10% -15% of Mg0, 0% -5% of Si02 and 0% -4% of F.C, and a discharge port of the submerged nozzle comprises 62% -67% of Al203, 4% -10% of Mg0 and 18% -24% of F.C.
In some embodiments, the body of the long nozzle is composed of 70% Al203, 8% Si02, and 22% f.c, the slag line of the long nozzle is composed of 42% Al203, 35% Mg0, and 23% f.c, and the liner of the long nozzle is composed of 78% Al203, 14% Mg0, 5% Si02, and 4% f.c.
In some embodiments, the body of the stopper rod consists of 66% Al203, 10% Mg0, 6% Si02, and 18% f.c, the slag line of the stopper rod consists of 58% Al203, 32% Mg0, and 20% f.c, and the head of the stopper rod consists of 72% Al203, 18% Mg0, and 10% f.c.
In some embodiments, the body of the submerged entry nozzle is composed of 65% Al203, 10% Si02 and 25% f.c, the slag line of the submerged entry nozzle is composed of 91% Zr02 and 9% f.c, the lining of the submerged entry nozzle is composed of 80% Al203, 12% Mg0, 5% Si02 and 3% f.c, and the discharge outlet of the submerged entry nozzle is composed of 66% Al203, 10% Mg0 and 24% f.c.
According to one aspect of the invention, the preparation method of the continuous casting three main pieces for the tundish high-performance steel is provided, and comprises the following preparation steps:
A. selecting raw materials;
B. processing raw materials;
C. inspecting raw materials;
D. molding;
E. drying;
F. firing;
G. processing a long nozzle, a stopper rod and an immersion nozzle;
H. spraying;
I. inspecting a finished product;
J. and (7) packaging and warehousing.
In some embodiments, raw material concentration comprises checking and warehousing various raw materials, and then weighing the raw materials according to a specified ratio;
the method comprises the steps of premixing raw materials of all components according to a proportion, preheating the premixed raw materials, mixing and granulating the preheated raw materials by using an automatic high-speed granulator, screening the granulated raw materials, and ageing and mixing the materials by using a planetary mixer under the conditions of constant temperature and constant humidity.
In some embodiments, the feedstock inspection performs particle size and moisture detection on the stranded and mixed feedstock.
In some embodiments, the forming is performed by cold isostatic pressing of the qualified raw material in a constant temperature and constant humidity state;
the sintering is to sinter the formed parts by using a high-temperature tunnel kiln.
In some embodiments, the long nozzle, stopper rod and submerged entry nozzle processing steps process the slag line portion on the long nozzle, stopper rod and submerged entry nozzle to process the thickness of the slag line to a prescribed size.
In some embodiments, the finished product inspection comprises an inspection of the finished product for the physical and chemical indicators and the dimensional parameters.
The invention relates to a continuous casting three-piece for tundish high-performance steel, which is a novel high-purity synthetic refractory raw material with low impurity content, and is prepared by mainly using electric melting magnesia-alumina spinel (MgO. Al2O3) and using aluminum oxide high-purity light-burned magnesium as a raw material, melting the electric melting magnesia-alumina spinel in an electric arc furnace at a high temperature of more than 2000 ℃, and then cooling and crushing the molten magnesia-alumina spinel. The fused magnesia-alumina spinel has large volume density and high melting point, can keep better chemical stability in high-oxygen or reducing atmosphere, and has strong capability of resisting the erosion of molten steel and molten slag under the action of high temperature. In addition, the fused magnesia-alumina spinel has firm structure, small thermal expansion coefficient and isotropy. Therefore, when the temperature suddenly changes, the generated thermal stress is small, and the thermal shock resistance is high. In the production of continuous casting 'three-piece' products, the material is used as a raw material with excellent thermal shock resistance and molten steel and slag corrosion resistance.
Therefore, aiming at the continuous casting products of high-performance variety steel, namely 'three major parts', long nozzle slag lines and linings; the head part of the stopper rod and the slag line; an immersion liner, a discharge port; the tundish upper nozzle bowl uses the electric melting magnesia-alumina spinel material as much as possible. Meanwhile, the content of C in three major refractory parts in contact with molten steel is reduced as much as possible, the amount of C in the refractory entering the molten steel is reduced, and the production requirements and service life improvement requirements of high-performance steel, ultra-low carbon and the like on C control are met.
The high-performance steel continuous casting three major pieces used in the project can effectively reduce the carbon entering in the high-oxygen, low-carbon and ultra-low-carbon steel refractory smelted by a steel mill, and effectively reduce the carbon inclusion. The continuous casting of the three major parts can reach the best technical level of Japan Kawasaki and Olympic of the same-enterprise manufacturers abroad at present, reach the use requirement of using 5 furnaces at the highest in a steel mill and the requirement of reducing the carbon content, and reduce the technical gap with the same-enterprise foreign-resource enterprises.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The continuous casting three major parts for the medium-package high-performance steel comprise a long nozzle, a stopper rod and a submerged nozzle, and are characterized in that a body of the long nozzle consists of 60-75% of Al203, 6-10% of Si02 and 20-24% of F.C in percentage by weight, a slag line of the long nozzle consists of 37-42% of Al203, 32-37% of Mg0 and 17-23% of F.C, and a lining of the long nozzle consists of 70-80% of Al203, 10-15% of Mg0, 0-5% of Si02 and 0-4% of F.C;
the stopper rod comprises a body, a slag line and a head, wherein the body of the stopper rod consists of 62-67% of Al203, 6-10% of Mg0, 0-6% of Si02 and 12-18% of F.C in percentage by weight, the slag line of the stopper rod consists of 55-60% of Al203, 32-37% of Mg0 and 17-24% of F.C, and the head of the stopper rod consists of 65-72% of Al203, 14-18% of Mg0 and 8-11% of F.C;
the submerged nozzle comprises a body, a lining and a discharge port, wherein the body of the submerged nozzle comprises, by weight, 60% -65% of Al203, 6% -10% of Si02 and 20% -25% of F.C, a slag line of the submerged nozzle comprises 79% -94% of Zr02 and 8% -11% of F.C, a lining of the submerged nozzle comprises 70% -80% of Al203, 10% -15% of Mg0, 0% -5% of Si02 and 0% -4% of F.C, and a discharge port of the submerged nozzle comprises 62% -67% of Al203, 4% -10% of Mg0 and 18% -24% of F.C.
The inner holes of the long nozzle and the submerged nozzle are made of carbon-free (low carbon) and silicon dioxide-free (low silicon dioxide). The long nozzle slag line is magnesia and spinel; the head part of the stopper rod, the body of the stopper rod and the bowl part of the tundish upper nozzle are made of corundum-spinel-carbon materials with low carbon and low silicon dioxide (no silicon dioxide); the stopper rod slag line adopts a magnesium oxide-spinel-carbon material. The product has the advantages of increased use stability and erosion resistance by more than 40%, and increased melting loss resistance and oxidation resistance by more than 30%.
The high-purity synthetic refractory material is prepared by mainly using electric melting magnesia-alumina spinel (MgO. Al2O3) and using aluminum oxide high-purity light-burned magnesium as a raw material, melting the electric melting magnesia-alumina spinel in an electric arc furnace at a high temperature of more than 2000 ℃, and then cooling and crushing the electric melting magnesia-alumina spinel. The fused magnesia-alumina spinel has large volume density and high melting point, can keep better chemical stability in high-oxygen or reducing atmosphere, and has strong capability of resisting the erosion of molten steel and molten slag under the action of high temperature. In addition, the fused magnesia-alumina spinel has firm structure, small thermal expansion coefficient and isotropy. Therefore, when the temperature suddenly changes, the generated thermal stress is small, and the thermal shock resistance is high. In the production of continuous casting 'three-piece' products, the material is used as a raw material with excellent thermal shock resistance and molten steel and slag corrosion resistance.
Therefore, aiming at the continuous casting products of high-performance variety steel, namely 'three major parts', long nozzle slag lines and linings; the head part of the stopper rod and the slag line; an immersion liner, a discharge port; the tundish upper nozzle bowl uses the electric melting magnesia-alumina spinel material as much as possible. Meanwhile, the content of C in three major refractory parts in contact with molten steel is reduced as much as possible, the amount of C in the refractory entering the molten steel is reduced, and the production requirements and service life improvement requirements of high-performance steel, ultra-low carbon and the like on C control are met.
The high-performance steel continuous casting three major pieces used in the project can effectively reduce the carbon entering in the high-oxygen, low-carbon and ultra-low-carbon steel refractory smelted by a steel mill, and effectively reduce the carbon inclusion. The continuous casting of the three major parts can reach the best technical level of Japan Kawasaki and Olympic of the same-enterprise manufacturers abroad at present, reach the use requirement of using 5 furnaces at the highest in a steel mill and the requirement of reducing the carbon content, and reduce the technical gap with the same-enterprise foreign-resource enterprises.
Example one
The body of the long nozzle consists of 70% Al203, 8% Si02 and 22% f.c, the slag line of the long nozzle consists of 42% Al203, 35% Mg0 and 23% f.c, and the lining of the long nozzle consists of 78% Al203, 14% Mg0, 5% Si02 and 4% f.c.
The body of the stopper consists of 66% Al203, 10% Mg0, 6% Si02 and 18% f.c, the slag line of the stopper consists of 58% Al203, 32% Mg0 and 20% f.c, and the head of the stopper consists of 72% Al203, 18% Mg0 and 10% f.c.
The body of the submerged entry nozzle consists of 65% Al203, 10% Si02 and 25% f.c, the slag line of the submerged entry nozzle consists of 91% Zr02 and 9% f.c, the lining of the submerged entry nozzle consists of 80% Al203, 12% Mg0, 5% Si02 and 3% f.c, and the discharge outlet of the submerged entry nozzle consists of 66% Al203, 10% Mg0 and 24% f.c.
Example two
The body of the long nozzle consists of 66% Al203, 10% Si02 and 24% f.c, the slag line of the long nozzle consists of 40% Al203, 37% Mg0 and 23% f.c, and the lining of the long nozzle consists of 80% Al203, 15% Mg0, 4% Si02 and 3% f.c.
The body of the stopper consists of 67% Al203, 6% Mg0, 4% Si02 and 23% f.c, the slag line of the stopper consists of 40% Al203, 36% Mg0 and 24% f.c, and the head of the stopper consists of 72% Al203, 17% Mg0 and 11% f.c.
The body of the submerged entry nozzle consists of 65% Al203, 10% Si02 and 25% f.c, the slag line of the submerged entry nozzle consists of 90% Zr02 and 10% f.c, the lining of the submerged entry nozzle consists of 77% Al203, 15% Mg0, 4% Si02 and 4% f.c, and the discharge outlet of the submerged entry nozzle consists of 66% Al203, 10% Mg0 and 24% f.c.
The preparation method of the continuous casting three major pieces for the tundish high-performance steel comprises the following preparation steps:
A. selecting raw materials;
B. processing raw materials;
C. inspecting raw materials;
D. molding;
E. drying;
F. firing;
G. processing a long nozzle, a stopper rod and an immersion nozzle;
H. spraying;
I. inspecting a finished product;
J. and (7) packaging and warehousing.
In some embodiments, raw material concentration comprises checking and warehousing various raw materials, and then weighing the raw materials according to a specified ratio;
the method comprises the steps of premixing raw materials of all components according to a proportion, preheating the premixed raw materials, mixing and granulating the preheated raw materials by using an automatic high-speed granulator, screening the granulated raw materials, and ageing and mixing the materials by using a planetary mixer under the conditions of constant temperature and constant humidity.
Raw material inspection particle size and moisture detection were performed on the aged and mixed raw materials.
Molding, and carrying out cold isostatic pressing on the qualified raw materials under the conditions of constant temperature and constant humidity;
the sintering is to sinter the formed parts by using a high-temperature tunnel kiln.
And a long nozzle, a stopper rod and an immersion nozzle processing step, wherein the slag line parts on the long nozzle, the stopper rod and the immersion nozzle are processed, and the thickness of the slag line is processed to a specified size.
And the finished product inspection comprises the inspection of the appearance size parameters and the inspection of physical and chemical indexes of the finished product.
Table 1: physicochemical index of long nozzle of high-performance steel
Table 2: physical and chemical indexes of high-performance steel stopper
Table 3: physical and chemical index of high-performance steel submerged nozzle
The foregoing describes only some embodiments of the present invention and modifications and variations thereof will be apparent to those skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. The continuous casting three major parts for the medium-package high-performance steel comprise a long nozzle, a stopper rod and a submerged nozzle, and are characterized in that a body of the long nozzle consists of 60-75% of Al203, 6-10% of Si02 and 20-24% of F.C in percentage by weight, a slag line of the long nozzle consists of 37-42% of Al203, 32-37% of Mg0 and 17-23% of F.C, and a lining of the long nozzle consists of 70-80% of Al203, 10-15% of Mg0, 0-5% of Si02 and 0-4% of F.C;
the stopper rod comprises a body, a slag line and a head, wherein the body of the stopper rod consists of 62-67% of Al203, 6-10% of Mg0, 0-6% of Si02 and 12-18% of F.C in percentage by weight, the slag line of the stopper rod consists of 55-60% of Al203, 32-37% of Mg0 and 17-24% of F.C, and the head of the stopper rod consists of 65-72% of Al203, 14-18% of Mg0 and 8-11% of F.C;
the submerged nozzle comprises a body, a lining and a discharge port, wherein the body of the submerged nozzle comprises, by weight, 60% -65% of Al203, 6% -10% of Si02 and 20% -25% of F.C, a slag line of the submerged nozzle comprises 79% -94% of Zr02 and 8% -11% of F.C, a lining of the submerged nozzle comprises 70% -80% of Al203, 10% -15% of Mg0, 0% -5% of Si02 and 0% -4% of F.C, and a discharge port of the submerged nozzle comprises 62% -67% of Al203, 4% -10% of Mg0 and 18% -24% of F.C.
2. The continuous casting three-piece for medium package high performance steel according to claim 1, wherein the body of the long nozzle is composed of 70% Al203, 8% Si02 and 22% F.C, the slag line of the long nozzle is composed of 42% Al203, 35% Mg0 and 23% F.C, and the lining of the long nozzle is composed of 78% Al203, 14% Mg0, 5% Si02 and 4% F.C.
3. The continuous casting three-piece for the tundish high-performance steel according to claim 1, wherein the body of the stopper rod consists of 66% Al203, 10% Mg0, 6% Si02 and 18% F.C, the slag line of the stopper rod consists of 58% Al203, 32% Mg0 and 20% F.C, and the head of the stopper rod consists of 72% Al203, 18% Mg0 and 10% F.C.
4. The continuous casting three-piece for medium package high performance steel of claim 3, wherein the body of the submerged entry nozzle is composed of 65% Al203, 10% Si02 and 25% F.C, the slag line of the submerged entry nozzle is composed of 91% Zr02 and 9% F.C, the lining of the submerged entry nozzle is composed of 80% Al203, 12% Mg0, 5% Si02 and 3% F.C, and the discharge outlet of the submerged entry nozzle is composed of 66% Al203, 10% Mg0 and 24% F.C.
5. The preparation method of the continuous casting three main parts for the tundish high-performance steel is characterized by comprising the following preparation steps:
A. selecting raw materials;
B. processing raw materials;
C. inspecting raw materials;
D. molding;
E. drying;
F. firing;
G. processing a long nozzle, a stopper rod and an immersion nozzle;
H. spraying;
I. inspecting a finished product;
J. and (7) packaging and warehousing.
6. The preparation method of the continuous casting three main parts for the tundish high-performance steel according to claim 5, wherein the raw material selection comprises the steps of checking and warehousing various raw materials, and weighing the raw materials according to a specified ratio;
the processing method comprises the steps of premixing raw materials of all components according to a proportion, preheating the premixed raw materials, mixing and granulating the preheated raw materials by using an automatic high-speed granulator, screening the granulated raw materials, and ageing and mixing the raw materials by using a planetary mixer under the conditions of constant temperature and constant humidity.
7. The method for preparing the continuous casting three large parts for the medium-package high-performance steel as claimed in claim 6, wherein the raw material inspection is to detect the particle size and moisture of the ageing and mixing raw materials.
8. The preparation method of the continuous casting three main parts for the tundish high-performance steel according to claim 5, wherein the forming is carried out on qualified raw materials in a cold isostatic pressing mode under the conditions of constant temperature and constant humidity;
the sintering is to sinter the formed parts by using a high-temperature tunnel kiln.
9. The method for manufacturing the continuous casting three large parts for the tundish high-performance steel according to claim 5, wherein the long nozzle, the stopper rod and the submerged nozzle processing steps process the slag line parts on the long nozzle, the stopper rod and the submerged nozzle to process the thickness of the slag line to a specified size.
10. The preparation method of the continuous casting three large parts for the medium-package high-performance steel as claimed in claim 5, wherein the finished product inspection comprises the inspection of appearance dimension parameters and the inspection of physical and chemical indexes of a finished product.
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