CN114749648A - Tundish for 1215 low-carbon high-sulfur free-cutting steel - Google Patents
Tundish for 1215 low-carbon high-sulfur free-cutting steel Download PDFInfo
- Publication number
- CN114749648A CN114749648A CN202210491752.7A CN202210491752A CN114749648A CN 114749648 A CN114749648 A CN 114749648A CN 202210491752 A CN202210491752 A CN 202210491752A CN 114749648 A CN114749648 A CN 114749648A
- Authority
- CN
- China
- Prior art keywords
- tundish
- layer
- steel
- precast slab
- prefabricated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000915 Free machining steel Inorganic materials 0.000 title claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 25
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 24
- 239000011593 sulfur Substances 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 104
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 103
- 238000009413 insulation Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 9
- 229910052681 coesite Inorganic materials 0.000 claims description 6
- 229910052906 cristobalite Inorganic materials 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052682 stishovite Inorganic materials 0.000 claims description 6
- 229910052905 tridymite Inorganic materials 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 13
- 238000009749 continuous casting Methods 0.000 abstract description 8
- 238000003908 quality control method Methods 0.000 abstract description 5
- 238000003723 Smelting Methods 0.000 abstract description 2
- 239000002893 slag Substances 0.000 description 32
- 239000011777 magnesium Substances 0.000 description 25
- 229910052749 magnesium Inorganic materials 0.000 description 25
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 22
- 230000003628 erosive effect Effects 0.000 description 15
- 239000000463 material Substances 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 11
- 239000011819 refractory material Substances 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 9
- 229910052596 spinel Inorganic materials 0.000 description 9
- 239000011029 spinel Substances 0.000 description 8
- 230000002829 reductive effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- -1 magnesium aluminate Chemical class 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910026161 MgAl2O4 Inorganic materials 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229910001677 galaxite Inorganic materials 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups 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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
Abstract
The invention relates to the technical field of steel smelting, in particular to a tundish for low-carbon high-sulfur free-cutting steel 1215, which comprises the following components: the device comprises a working area and a steel receiving part arranged in the working area; the working area comprises a first heat insulation layer, a first permanent layer and a working layer which are sequentially stacked from outside to inside; the steel receiving part comprises a second heat insulation layer, a second permanent layer and a first prefabricated part which are sequentially stacked from outside to inside, the second heat insulation layer is connected with the first heat insulation layer, the first permanent layer is connected with the second permanent layer, the working layer is connected with the first prefabricated part, and the volume density of the first prefabricated part is greater than that of the working layer. The tundish disclosed by the invention can prolong the service life of the tundish and improve the risk problems of safe and stable production of a continuous casting machine and quality control of a casting blank when producing low-carbon high-sulfur free-cutting steel 1215.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a tundish for low-carbon high-sulfur free-cutting steel 1215.
Background
The tundish is a refractory material container used in steelmaking, is one of key devices in the continuous casting process, and plays an important role in the smooth continuous casting operation and the guarantee of the quality of molten steel. The tundish has the functions of stabilizing flow, shunting, reducing pressure, protecting molten steel, removing impurities in the molten steel and the like. Generally, a tundish refractory lining mainly comprises a heat insulation layer, a permanent layer and a working layer, wherein the working layer is in contact with molten steel and is a key part of a tundish lining, the working layer generally adopts magnesium dry materials or coating materials, the working layer is always eroded by molten steel and ladle slag in the use process of the tundish, and the service life of the tundish is directly influenced by the erosion speed of the working layer.
When the low-carbon high-sulfur free-cutting steel 1215 is produced by the related technology, the corrosion of the working layer is serious because the free oxygen in the molten steel is up to more than 50ppm, the alkalinity of the ladle slag is low, and the Tfe and MnO in the slag are high. When the tundish is continuously cast, the working layer is seriously corroded, the service life of the tundish is seriously influenced, and great risks are brought to the safe and stable production of a continuous casting machine and the quality control of a casting blank.
Disclosure of Invention
The invention provides a tundish for low-carbon high-sulfur free-cutting steel 1215, which can prolong the service life of the tundish and improve the risk problems of safe and stable production of a continuous casting machine and casting blank quality control when the low-carbon high-sulfur free-cutting steel 1215 is produced.
Embodiments of the invention may be implemented as follows:
the invention provides a tundish for low-carbon high-sulfur free-cutting steel 1215, which comprises the following components: the steel receiving part is arranged in the working area;
the working area comprises a first heat insulation layer, a first permanent layer and a working layer which are sequentially stacked from outside to inside;
the steel receiving part comprises a second heat insulation layer, a second permanent layer and a first prefabricated part which are sequentially stacked from outside to inside, the second heat insulation layer is connected with the first heat insulation layer, the first permanent layer is connected with the second permanent layer, the working layer is connected with the first prefabricated part, and the volume density of the first prefabricated part is greater than that of the working layer.
In an alternative embodiment, the steel receiving part further comprises a second prefabricated part, the second prefabricated part is spaced from and distributed opposite to the first prefabricated part, and a steel receiving area is formed between the first prefabricated part and the second prefabricated part; the bulk density of the second preform is greater than the bulk density of the working layer.
In an alternative embodiment, Al in the raw materials for the production of at least one of the first preform and the second preform is, in percentages, Al in the first preform and in the second preform2O3And MgO in a total content of 80% or more, and SiO2The content of (A) is less than or equal to 5.0%;
al in raw material for preparing working layer2O3And MgO in a total content of 55% or more, and SiO2The content of (B) is less than or equal to 20.0%.
In an alternative embodiment, the bulk density of at least one of the first and second preforms is, at 200 ℃x3 h: not less than 2.85g/cm3The temperature is 1500 ℃ multiplied by 3h, and the reaction time is as follows: 2.65 +/-0.20 g/cm3；
The volume density of the working layer under the conditions of 200 ℃ and 3h is as follows: not less than 2.05g/cm3The temperature is 1500 ℃ multiplied by 3h, and the reaction time is as follows: 1.85 +/-0.20 g/cm3。
In an alternative embodiment, the second prefabricated member comprises a fourth prefabricated plate, a fifth prefabricated plate and a sixth prefabricated plate which are sequentially connected in an included angle, and the included angle between the fourth prefabricated plate and the fifth prefabricated plate and the included angle between the fifth prefabricated plate and the sixth prefabricated plate are larger than 90 degrees.
In an alternative embodiment, the angle between the fourth and fifth preformed panels and the angle between the fifth and sixth preformed panels is 136 °.
In an alternative embodiment, the fourth prefabricated plate and the sixth prefabricated plate are respectively provided with two molten steel flowing holes.
In an alternative embodiment, one of the molten steel flow holes opened in the fourth prefabricated panel is spaced 100mm from the bottom of the second prefabricated panel, and the other molten steel flow hole opened in the fourth prefabricated panel is located 50mm below the height of the second prefabricated panel 1/2.
In an alternative embodiment, the diameter of the molten steel passing hole is 100 mm.
In an alternative embodiment, the first prefabricated plate comprises a first prefabricated plate, a second prefabricated plate and a third prefabricated plate which are sequentially connected in an included angle mode, and the included angle between the first prefabricated plate and the second prefabricated plate and the included angle between the second prefabricated plate and the third prefabricated plate are larger than 90 degrees.
The embodiment of the invention has the beneficial effects that:
the low-carbon high-sulfur free-cutting steel 1215 provided by the embodiment of the invention has the advantages that the inner layer of the steel receiving part of the tundish is provided with the first prefabricated member with higher volume density to replace the arrangement of the working layer on the steel receiving part, the compactness of the first prefabricated member can be increased due to the higher volume density of the first prefabricated member, the gap of the first prefabricated member is reduced, the porosity is reduced, the corrosion resistance of the first prefabricated member is enhanced, the corrosion of the molten steel and ladle slag on the first prefabricated member can be effectively slowed down when the low-carbon high-sulfur free-cutting steel 1215 is used, the service life of the first prefabricated member is prolonged, the service life of the tundish is prolonged, and the risk problems of safety, stable production and casting blank quality control of a continuous casting machine can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view showing a tundish for a low-carbon high-sulfur free-cutting steel 1215 according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a first preform in an embodiment of the present invention;
FIG. 3 is a schematic structural view of a second preform in an embodiment of the present invention.
Icon: 010-tundish; 100-a working area; 101-stopper rod hole; 110 — a first thermal insulation layer; 120-a first permanent layer; 130-a working layer; 200-a steel-receiving part; 210-a second thermal insulation layer; 220-a second permanent layer; 230-a first preform; 231-the first prefabricated panel; 232-a second prefabricated panel; 233-a third prefabricated panel; 240-a second preform; 241-a fourth precast slab; 242-fifth preformed sheet; 243-sixth prefabricated panel; 244-molten steel flow-through hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the present invention is used, the description is merely for convenience of describing the present invention and simplifying the description, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and operation, and thus, cannot be understood as the limitation of the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to FIG. 1, the present example provides a tundish (hereinafter referred to as tundish 010) for low carbon high sulfur free-cutting steel 1215, which includes: a working area 100 and a steel receiving part 200 arranged in the working area 100; the working area 100 comprises a first thermal insulation layer 110, a first permanent layer 120 and a working layer 130 which are sequentially stacked from outside to inside; the steel receiving part 200 comprises a second heat insulation layer 210, a second permanent layer 220 and a first prefabricated part 230 which are sequentially stacked from outside to inside, wherein the second heat insulation layer 210 is connected with the first heat insulation layer 110, the first permanent layer 120 is connected with the second permanent layer 220, the working layer 130 is connected with the first prefabricated part 230, and the volume density of the first prefabricated part 230 is greater than that of the working layer 130.
In the related art, the steel receiving part is provided with the same working layer as the working area, and in order to solve the problem that the working layer of the steel receiving part is easy to corrode, a mode of increasing the MgO content of the working layer slag line of the steel receiving part and increasing the thickness of the working layer of the steel receiving part is adopted, but the effect of the mode is not obviously improved, and when the low-carbon high-sulfur free-cutting steel 1215 is produced, the number of continuous casting furnaces can be increased from 8 furnaces (using time 6h) to 10 furnaces, and the requirement of continuously producing 16 furnaces (using time 12h) cannot be met. In addition, the erosion of the working layer is serious during later casting, and erosion resistant materials are involved in molten steel, so that the molten steel is polluted; the distribution of the ladle slag in the whole middle container easily causes the sticking of the stopper rod and the ladle slag, and influences the liquid level control stability of the crystallizer. The tundish 010 provided by the embodiment can effectively improve the erosion resistance by arranging the first prefabricated member 230 with larger volume density at the steel receiving part 200 to replace the working layer 130, not only can realize continuous casting of 16 furnaces (with the service time of 12h), but also can avoid erosion resistant materials from being involved in molten steel to cause the molten steel to be polluted, and is not easy to cause the adhesion of a stopper rod and ladle slag, thereby improving the influence on the liquid level control stability of a crystallizer.
Moreover, the first prefabricated member 230 with larger volume density is used for replacing the working layer 130, instead of arranging the first prefabricated member 230 on the inner side of the working layer 130 after the working layer 130 is arranged on the steel receiving part 200, the space occupied by the first prefabricated member 230 on the steel receiving part 200 can be reduced, the volume of the steel receiving part 200 is increased, and floating of inclusions is facilitated; moreover, the direct replacement of the working layer 130 of the steel receiving part 200 by the first preform 230 ensures the stability of the assembly of the first preform 230, reducing the possibility of the first preform 230 being out of its assembly position.
It should be noted that the working area 100 is provided with a stopper hole 101 for installing a stopper.
Referring to fig. 2, the first prefabricated panel 230 includes a first prefabricated panel 231, a second prefabricated panel 232 and a third prefabricated panel 233 which are sequentially connected at an included angle, and the included angle of the first prefabricated panel 231 and the second prefabricated panel 232 and the included angle of the second prefabricated panel 232 and the third prefabricated panel 233 are greater than 90 °, for example: 91 °, 95 °, 120 °, 140 °, etc.
Referring to fig. 1 and 2, further, the second thermal insulation layer 210, the second permanent layer 220 and the first preform 230 of the steel receiving portion 200 are sequentially stacked and tightly attached, that is, the shape of the second thermal insulation layer 210 and the second permanent layer 220 is matched with the shape of the first preform 230. So set up, receiving steel portion 200 has the angle that is greater than 90 and can reduce the velocity of flow of molten steel in the corner, and the long mouth of a river production operation of bale of convenience, and alleviate receiving steel district steel stream to the erosion of resistant material.
In order to protect the second permanent layer 220 of the steel-receiving portion 200 from erosion, the height of the first preform 230 is consistent with the height and angle of the inner cavity of the steel-receiving portion 200, and the first preform 230 is tightly attached to the second permanent layer 220.
The working space 100 of this embodiment is substantially rectangular, the first thermal insulation layer 110, the first permanent layer 120 and the working layer 130 are all rectangular frame structures with openings, both ends of the second thermal insulation layer 210 are respectively connected with both sides of the first thermal insulation layer 110 at the openings, both ends of the second permanent layer 220 are respectively connected with both sides of the first permanent layer 120 at the openings, both ends of the first preform 230 are respectively connected with both sides of the working layer 130 at the openings, i.e., one end of the first prefabricated panel 231, which is far away from the second prefabricated panel 232, and one end of the third prefabricated panel 233, which is far away from the second prefabricated panel 232, are respectively connected with both sides of the working layer 130 at the openings.
Referring to fig. 1, in the present embodiment, the steel receiving portion 200 further includes a second prefabricated member 240, the second prefabricated member 240 is spaced from and distributed opposite to the first prefabricated member 230, and a steel receiving area is formed between the first prefabricated member 230 and the second prefabricated member 240; the bulk density of the second preform 240 is greater than the bulk density of the working layer 130. The second preform 240 may serve as a slag-stopping preform, which may function as a slag-stopping preform, i.e., effectively prevent ladle slag from flowing into the working area 100 of the tundish 010, prevent the ladle slag from eroding the working layer 130 of the working area 100, and prevent the stopper rod disposed in the stopper rod hole 101 from being bonded.
In order to ensure the installation stability of the second preform 240 and effectively prevent ladle slag from entering the working area 100 beyond the second preform 240, the height of the second preform 240 coincides with the height of the inner cavity of the steel receiving part 200, i.e., the heights of the second preform 240, the first preform 230, and the steel receiving area.
Optionally, the upper edge of the second preform 240 contacts with the tundish 010 cover, so that the tundish 010 cover can press the second preform 240, and the tundish 010 cover is used for ensuring the assembly stability of the second preform 240, that is, the tundish 010 cover is used for fixing the second preform 240, so that the phenomenon that the second preform 240 falls due to the action of ferrostatic pressure during casting can be prevented, and stable and reliable operation is ensured.
Referring to FIG. 3, the second prefabricated panel 240 includes a fourth prefabricated panel 241, a fifth prefabricated panel 242 and a sixth prefabricated panel 243 which are sequentially connected at an included angle, and the included angle between the fourth prefabricated panel 241 and the fifth prefabricated panel 242, and the included angle between the fifth prefabricated panel 242 and the sixth prefabricated panel 243 are greater than 90 degrees, for example: 91 °, 95 °, 120 °, 140 °, etc. By such an arrangement, the erosion of the second preform 240 by the molten steel can be reduced.
It should be noted that the first preform 230 and the second preform 240 may be substantially trapezoidal, so that the steel receiving area between the two is substantially hexagonal.
It should be noted that, referring to fig. 1-3, the fifth prefabricated plate 242 is opposite to and spaced apart from the second prefabricated plate 232, the end of the first prefabricated plate 231 remote from the second prefabricated plate 232 is connected with the end of the fourth prefabricated plate 241 remote from the fifth prefabricated plate 242 at an included angle, and the end of the third prefabricated plate 233 remote from the second prefabricated plate 232 is connected with the end of the sixth prefabricated plate 243 remote from the fifth prefabricated plate 242 at an included angle, so that the hollow space of the steel-receiving area is approximately hexagonal.
Referring to fig. 3, the fourth prefabricated plate 241 and the sixth prefabricated plate 243 are respectively provided with two molten steel flowing holes 244, so that molten steel can flow from the steel receiving area to the working area 100 through the molten steel flowing holes 244; in addition, the molten steel circulation holes 244 are formed in the fourth prefabricated plate 241 and the sixth prefabricated plate 243, so that the molten steel circulation holes 244 are formed in both sides of the second prefabricated plate 240, and thus, a molten steel flow field can be changed, molten steel is prevented from directly impacting a stopper rod arranged in the stopper rod hole 101, and the stability of the stopper rod is improved.
In order to ensure a good slag stopping effect of the second preform 240, the molten steel flow hole 244 may be disposed below a height centerline of the second preform 240, i.e., the molten steel flow hole 244 may be disposed below 1/2 height of the second preform 240.
The molten steel circulation holes 244 of the fourth and sixth prefabricated plates 241 and 243 may be symmetrically distributed; hereinafter, only the position of the molten steel flow hole 244 of the fourth precast plate 241 will be described. One of the molten steel flow holes 244 formed in the fourth prefabricated plate 241 is spaced apart from the bottom of the second prefabricated plate 240 by 100mm, and the other molten steel flow hole 244 formed in the fourth prefabricated plate 241 is positioned 50mm below the 1/2 height of the second prefabricated plate 240. During the process of turning and casting the ladle, the liquid level of the molten steel in the tundish 010 drops 1/3-1/2, and the molten steel flowing hole 244 is arranged at the position, so that the position of the steel slag is not lower than the molten steel flowing hole 244 during the turning and casting process, the molten steel is convenient to be below the height center line of the second prefabricated part 240, and a good slag stopping effect is achieved.
It should be noted that one of the molten steel flowing holes 244 is opened at a position 100mm away from the bottom of the fourth prefabricated plate 241 to ensure that molten steel is not accumulated in the steel receiving area, i.e. to avoid accumulating a large amount of molten steel in the steel receiving area when the casting is stopped, and the other molten steel flowing hole 244 is arranged at a position 50mm below the 1/2 height of the fourth prefabricated plate 241, so that when the liquid level of molten steel in the tundish 010 drops in the ladle casting process, the position of steel slag is effectively ensured not to be lower than the molten steel flowing hole 244, i.e. slag is effectively blocked.
In order to reduce the effect of the static pressure of molten steel, the diameter of the molten steel flow hole 244 may be increased as much as possible; meanwhile, it is necessary to consider the influence of the diameter of the molten steel passing hole 244 on the strength of the second preform 240; in the preferred embodiment, the diameter of the molten steel flow hole 244 is 100 mm.
Alternatively, in some embodiments, in order to avoid the center of the molten steel flowing hole 244 from directly corresponding to the stopper rod provided in the stopper rod hole 101, the bending angle of the second preform 240 may be 136 °, that is, the included angle between the fourth and fifth preformed plates 241 and 242 and the included angle between the fifth and sixth preformed plates 242 and 243 may be 136 °.
Optionally, in order to reduce the turbulence of the steel-receiving area, the cavity of the steel-receiving area can be arranged as large as possible; therefore, in some embodiments, referring to fig. 1, the second prefabricated member 240 may be expanded to a side away from the first prefabricated member 230, and specifically, the lengths of the fourth prefabricated plate 241 and the sixth prefabricated plate 243 may be extended as much as possible; it is required to ensure that the fifth prefabricated plate 242 of the second preform 240 is spaced apart from the stopper rod disposed at the stopper rod hole 101 by a distance greater than or equal to the distance between the working layer 130 where the stopper rod is opposed to the fifth prefabricated plate 242.
Alternatively, the thickness of the first preform 230 and the second preform 240 may be maintained to be 60mm consistent with the thickness of the working layer 130 by the mold.
To ensure that the bulk density of the first preform 230 is greater than the bulk density of the working layer 130; the first preform 230 is a special magnesium preform for integral casting molding, and the working layer 130 is a magnesium dry material or a coating material. Wherein, the physical and chemical indexes of the special magnesium prefabricated part are shown in a table 1, and the physical and chemical indexes of the magnesium dry material or the coating material are shown in a table 2.
TABLE 1 physicochemical indices of special magnesium prefabricated parts
TABLE 2 magnesium Dry or coating
According to the research and analysis of the inventor, the steel slag of the low-carbon high-sulfur free-cutting steel 1215 contains SiO215-25%, FeO 2-8%, MnO 6-20%, and SiO contained in steel slag relative to other types of section steel25-10% of FeO 0-2% and MnO 0-4% are much higher, and [ O ] in the slag is increased along with the increase of MnO/FeO in the slag]The reaction with C/Al in the refractory material is accelerated, so that the corrosion rate of the refractory material is obviously accelerated.
SiO in 1215 steel slag2MnO-FeO with A12O3MnO-SiO is easily formed2-A12O3Liquid oxide, thereby easily causing corrosion to the refractory; SiO 22MnO-FeO with Al2O3+ MgO reaction to form MgAl2O4、MnAl2O4The spinel phase is solid and can adhere to the surface of the refractory to prevent the steel slag from further corroding the refractory, so that spinel Al is selected for the working layer 130 and the prefabricated member2O3+ MgO as a main component, not using simple Al which is generally used in the related art2O3-C as a main component.
The inventor researches the erosion behavior of spinel refractory materials with different compressive strengths when the spinel refractory materials are contacted with high manganese slag; specifically, the corrosion behavior of a spinel refractory material sample is analyzed by a fine rod rotation test method (FRT) in 1550 ℃ molten slag at a rotating speed of 150 r/min. Before the thin rod rotation test is adopted, the refractory material sample with high compressive strength has high bonding strength and low porosity among magnesium aluminate spinel aggregates, and bonding agents can be observed among the aggregates; in contrast, the samples with lower compressive strength had a small pore composition between the various fine particle size magnesium aluminate spinel and the larger magnesium aluminate spinel aggregates, with no binder observed between the aggregates. After the thin rod rotation test, SEM and EDS are adopted for analysis, in two groups of samples, at the interface of slag-refractory materials, the refractory materials are dissolved into slag, so that the radius of the samples is reduced, and the penetration of the slag into the refractory materials can be further observed; however, the penetration of the slag is prevented by chemical erosion of the binder and the aggregates in the test sample of the refractory having high compressive strength, and the slag easily penetrates into the test sample having low compressive strength without reacting with the refractory due to more pores in the test sample having low compressive strength, and thus the refractory is suddenly broken during the fine rod rotation test for 30-60min since it prevents the decrease in the strength of the refractory due to the bonding between the aggregates. Two important differences observed in the microstructure of the samples, namely the presence or absence of a binder between the porosity and the aggregate, are responsible for the different erosion levels of the different samples.
It can be seen from tables 1 and 2 that the compressive strength and bulk density of the special magnesium preform are greatly different from those of the magnesium dry material or coating material of the working layer 130, the bulk density of the special magnesium preform is improved, the density is increased, the gap is reduced, the porosity is reduced, and MnO-SiO in slag can be prevented2-A12O3The special magnesium prefabricated part is penetrated into the interior of the prefabricated part, so that the anti-corrosion effect of the special magnesium prefabricated part is effectively improved, namely the anti-corrosion capability is improved, and the corrosion of molten steel and ladle slag on the special magnesium prefabricated part can be effectively slowed down; in addition, the compressive strength of the special magnesium prefabricated part is greatly improved, and MnO-SiO in slag can be prevented2-A12O3Inside the infiltration prefabrication, effectively improve the anti erosion effect of special magnesium prefab, and then guaranteed working strength, can prevent that special magnesium prefab from collapsing at work, meanwhile also improve special magnesium prefab erosion resistance ability.
In addition, SiO2The increase can reduce the strength of the prefabricated member, and in order to ensure the strength of the special magnesium prefabricated member, SiO is added2The content is controlled within 5 percent.
In this embodiment, the second preform 240 is also a special magnesium preform for integral casting molding, and the physical and chemical indexes thereof are the same as those of the first preform 230, which are not described herein again.
The physical and chemical indexes of the first permanent layer 120 and the second permanent layer 220 of the present embodiment are the same, as shown in table 3.
TABLE 3 physicochemical indices of the first permanent layer 120 and the second permanent layer 220
The assembling process of the tundish 010 of the embodiment includes: after the first permanent layer 120 and the second permanent layer 220 of the tundish 010 are knotted, when the construction of the working layer 130 of the tundish 010 is carried out, the first prefabricated plate 231 is placed on the steel receiving part 200 instead of arranging the working layer 130 on the steel receiving part 200, then the construction of the working layer 130 of the working area 100 is carried out, and a gap between the first prefabricated member 230 and the working layer 130 of the working area 100 is filled with a magnesium dry material, so that the working layer 130 and the first prefabricated member 230 are connected through the magnesium dry material filling. After the construction of the working layer 130 is finished, placing a second prefabricated part 240 according to requirements, when the second prefabricated part 240 is installed, leveling the bottom by using a magnesium dry-type enclosure material, filling the second prefabricated part 240 with the enclosure bottom and the enclosure wall around the two sides of the contact surface, and tamping the dry-type material tightly by using a small hammer; the enclosure can be made into a right triangle with a side length of 60mm for fixing the second prefabricated member 240, so that the second prefabricated member 240 can be more easily disassembled during unpacking, and the first permanent layer 120 and the second permanent layer 220 cannot be adversely affected.
In conclusion, the tundish for the low-carbon high-sulfur free-cutting steel 1215 can solve the problem that the steel receiving part 200 is easy to corrode, and is further beneficial to prolonging the service life of the tundish 010, and the service life of the tundish 010 can be prolonged from 8 furnaces to about 16 furnaces to 25 furnaces on average; moreover, the corrosion reduction of the steel receiving area can avoid impurities from entering the molten steel so as to improve the purity of the molten steel; in addition, the second prefabricated member 240 effectively prevents the ladle slag from diffusing to the working area 100, so that the stopper rod is prevented from being bonded, and meanwhile, due to the reasonable design of the molten steel flow holes 244 on the two sides of the second prefabricated member 240, the stopper rod can be prevented from being directly impacted by molten steel, so that the liquid level fluctuation control of the crystallizer is greatly improved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A tundish for a low carbon, high sulfur free-cutting steel 1215, comprising: the device comprises a working area and a steel receiving part arranged in the working area;
the working area comprises a first heat insulation layer, a first permanent layer and a working layer which are sequentially stacked from outside to inside;
the steel receiving part comprises a second heat insulation layer, a second permanent layer and a first prefabricated part which are sequentially stacked from outside to inside, the second heat insulation layer is connected with the first heat insulation layer, the first permanent layer is connected with the second permanent layer, the working layer is connected with the first prefabricated part, and the volume density of the first prefabricated part is larger than that of the working layer.
2. The tundish of claim 1, wherein the receiving portion further comprises a second preform spaced apart from and opposite the first preform, and a receiving area is formed between the first and second preforms; the bulk density of the second preform is greater than the bulk density of the working layer.
3. The tundish for the low carbon high sulfur free-cutting steel 1215 according to claim 2, characterized in that the Al in the raw materials for the production of at least one of the first preform and the second preform is, in percent, Al2O3And MgO in a total content of 80% or more, and SiO2The content of (A) is less than or equal to 5.0%;
al in the raw material for preparing the working layer2O3And MgO in a total content of 55% or more, and SiO2Is less than or equal to 20.0%.
4. The tundish of claim 3, wherein the bulk density of at least one of the first and second preforms is at 200 ℃ x 3 h: not less than 2.85g/cm3The temperature is 1500 ℃ multiplied by 3h, and the reaction time is as follows: 2.65 +/-0.20 g/cm3；
The volume density of the working layer under the condition of 200 ℃ multiplied by 3h is as follows: not less than 2.05g/cm3The temperature is 1500 ℃ multiplied by 3h, and the reaction time is as follows: 1.85 +/-0.20 g/cm3。
5. The tundish 1215 for the low carbon and high sulfur free-cutting steel 1215 according to claim 2, wherein the second precast slab comprises a fourth precast slab, a fifth precast slab and a sixth precast slab which are sequentially connected with an included angle, and the included angle between the fourth precast slab and the fifth precast slab and the included angle between the fifth precast slab and the sixth precast slab are greater than 90 °.
6. The tundish 1215 for the low carbon, high sulfur, free-cutting steel 1215 according to claim 5, wherein the included angle between the fourth preformed plate and the fifth preformed plate, and the included angle between the fifth preformed plate and the sixth preformed plate are 136 °.
7. The tundish for the low-carbon high-sulfur free-cutting steel 1215 according to claim 5, wherein the fourth precast slab and the sixth precast slab are both provided with two molten steel through holes.
8. The tundish for the low carbon high sulfur free-cutting steel 1215 according to claim 7, wherein one of the molten steel flow holes formed in the fourth precast slab is spaced 100mm from the bottom of the second precast slab, and the other molten steel flow hole formed in the fourth precast slab is located 50mm below the height of the second precast slab 1/2.
9. The tundish for the low carbon high sulfur free-cutting steel 1215 according to claim 7, wherein the diameter of the molten steel flow hole is 100 mm.
10. The tundish for the low carbon high sulfur free-cutting steel 1215 according to claim 1, wherein the first preformed unit includes a first preformed unit, a second preformed unit and a third preformed unit which are sequentially connected with an included angle, and the included angle between the first preformed unit and the second preformed unit and the included angle between the second preformed unit and the third preformed unit are greater than 90 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210491752.7A CN114749648A (en) | 2022-05-07 | 2022-05-07 | Tundish for 1215 low-carbon high-sulfur free-cutting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210491752.7A CN114749648A (en) | 2022-05-07 | 2022-05-07 | Tundish for 1215 low-carbon high-sulfur free-cutting steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114749648A true CN114749648A (en) | 2022-07-15 |
Family
ID=82334913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210491752.7A Pending CN114749648A (en) | 2022-05-07 | 2022-05-07 | Tundish for 1215 low-carbon high-sulfur free-cutting steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114749648A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8301763D0 (en) * | 1983-01-21 | 1983-02-23 | Labate M D | Blast furnace trough |
| CN103357831A (en) * | 2013-07-30 | 2013-10-23 | 莱芜钢铁集团有限公司 | Tundish multifunctional steady-flow impacting barrel and building method thereof |
| JP2013252564A (en) * | 2013-08-02 | 2013-12-19 | Nippon Steel & Sumitomo Metal Corp | Precast block refractory and ladle bed structure using the precast block refractory |
| CN203917892U (en) * | 2014-05-09 | 2014-11-05 | 武汉钢铁(集团)公司 | Long-life tundish |
| CN206356578U (en) * | 2016-12-29 | 2017-07-28 | 中钢集团邢台机械轧辊有限公司 | A kind of Novel molten iron bag mouth |
| CN107602141A (en) * | 2017-11-02 | 2018-01-19 | 武汉威林科技股份有限公司 | A kind of tundish slag wall, impact brick and preparation method thereof |
| CN209491337U (en) * | 2018-12-24 | 2019-10-15 | 上海宝明耐火材料有限公司 | The tundish of resistance to melting loss |
| CN210587148U (en) * | 2019-08-19 | 2020-05-22 | 武汉钢铁集团耐火材料有限责任公司 | Integral tundish impact area prefabricated part |
-
2022
- 2022-05-07 CN CN202210491752.7A patent/CN114749648A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8301763D0 (en) * | 1983-01-21 | 1983-02-23 | Labate M D | Blast furnace trough |
| CN103357831A (en) * | 2013-07-30 | 2013-10-23 | 莱芜钢铁集团有限公司 | Tundish multifunctional steady-flow impacting barrel and building method thereof |
| JP2013252564A (en) * | 2013-08-02 | 2013-12-19 | Nippon Steel & Sumitomo Metal Corp | Precast block refractory and ladle bed structure using the precast block refractory |
| CN203917892U (en) * | 2014-05-09 | 2014-11-05 | 武汉钢铁(集团)公司 | Long-life tundish |
| CN206356578U (en) * | 2016-12-29 | 2017-07-28 | 中钢集团邢台机械轧辊有限公司 | A kind of Novel molten iron bag mouth |
| CN107602141A (en) * | 2017-11-02 | 2018-01-19 | 武汉威林科技股份有限公司 | A kind of tundish slag wall, impact brick and preparation method thereof |
| CN209491337U (en) * | 2018-12-24 | 2019-10-15 | 上海宝明耐火材料有限公司 | The tundish of resistance to melting loss |
| CN210587148U (en) * | 2019-08-19 | 2020-05-22 | 武汉钢铁集团耐火材料有限责任公司 | Integral tundish impact area prefabricated part |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100522882C (en) | Fire resistive material for desulfurization spray gun and producing technique for the desulfurization spray gun | |
| CN101176914A (en) | Method for preventing cast steel stove continuous casting water gap from obstruction and reducing erosion | |
| US4210264A (en) | Immersion nozzle for continuous casting of molten steel | |
| US4993692A (en) | Unitary tundish linings with flow-control devices | |
| JP2014512277A (en) | Refractory elements, assemblies and tundish for transporting molten metal | |
| CN114749648A (en) | Tundish for 1215 low-carbon high-sulfur free-cutting steel | |
| CN103357831B (en) | The multi-functional current stabilization of a kind of tundish impacts bucket and building method thereof | |
| US4792070A (en) | Tubes for casting molten metal | |
| US5505348A (en) | Molten steel pouring nozzle | |
| US5244130A (en) | Molten steel pouring nozzle | |
| WO2005018851A1 (en) | Immersion nozzle for continuous casting of steel and meethod for continuous casting of steel using the immersion nozzle | |
| JPS6144836B2 (en) | ||
| KR20090076011A (en) | Refractories of submerged entry nozzle for continuos casting | |
| CN102179491A (en) | Argon-blowing prefabricated member for continuous casting tundish cover | |
| JP4431111B2 (en) | Continuous casting nozzle | |
| CN1300649A (en) | Slag-stopping plate for tundish in conticasing | |
| CN212761087U (en) | Tundish argon blowing current stabilizer of continuous casting machine | |
| CA2104717C (en) | Molten steel pouring nozzle | |
| GB2081702A (en) | Immersion Nozzle for Continuous Casting of Molten Steel | |
| KR101235612B1 (en) | Structure of refractories in discharging part of molten steel | |
| JP2004322208A (en) | Continuous casting method for cast piece having excellent quality characteristic | |
| JPH02104454A (en) | Nozzle for continuous casting | |
| JP4315847B2 (en) | Dipping nozzle for continuous casting with good adhesion | |
| CN212822648U (en) | Tundish current stabilizer | |
| KR100448509B1 (en) | Filler of steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |