CN213496468U - Continuous casting molten steel tundish nozzle - Google Patents
Continuous casting molten steel tundish nozzle Download PDFInfo
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- CN213496468U CN213496468U CN202021218356.XU CN202021218356U CN213496468U CN 213496468 U CN213496468 U CN 213496468U CN 202021218356 U CN202021218356 U CN 202021218356U CN 213496468 U CN213496468 U CN 213496468U
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Abstract
The utility model provides a continuous casting molten steel tundish mouth of a river, includes mouth of a river and lower mouth of a river, and the mouth of a river is inlayed in the brick cup to in being fixed in the bottom plate of middle inclusion, the upper end and the mouth of a river lower extreme sealing contact of lower mouth of a river, the mouth of a river includes mouth of a river parent, first zirconium core and first molten steel flow through hole, first zirconium core is inlayed and is set up in mouth of a river parent, first molten steel flow through hole is set up in first zirconium core, first zirconium core external diameter d1The thickness of the inner wall of the upper inlet of the first zirconium core is 50-65mm, and the parent body of the upper nozzle and the inner wall of the upper inlet of the first zirconium core are both obliquely arranged; the lower nozzle comprises a lower nozzle matrix, a second zirconium core and a second molten steel flow through hole, wherein the second zirconium core is cylindrical, and the outer diameter of the second zirconium core is the same as that of the first zirconium core. The utility model enlarges the zirconium in the upper water inlet and the lower water inletThe diameter of the core is used for resisting the scouring of molten steel to the zirconium core in high-pulling-speed production, and chamfers are arranged at the inlets of the upper nozzle and the lower nozzle of the zirconium core so as to slow down the direct scouring of the high-flow-rate molten steel to the inlet of the zirconium core and prolong the service life of the zirconium core.
Description
Technical Field
The utility model relates to a continuous casting molten steel tundish nozzle, belonging to the technical field of steel making.
Background
At present, a tundish is used for containing molten steel in a steelmaking continuous casting process, and the molten steel flows downwards to a continuous casting crystallizer through a tundish nozzle to finish the shaping and billet discharging of a billet. The water gap of the tundish through which the molten steel flows is a channel of the molten steel, and the service life of the tundish is determined by the service life of the tundish, so that the improvement of yield and the quality are restricted. In the process of continuous casting high pulling speed, the upper edges of zirconium cores in an upper water inlet and a lower water outlet of an existing tundish are both arranged at the same level with the upper edge of a parent body, molten steel in the zirconium cores flows through a hole inlet with a vertical angle of 90 degrees, and the inlet of the zirconium core is continuously subjected to direct impact scouring of high flow rate of the molten steel and is easy to damage; molten steel flowing through the hole inlet of the lower nozzle is also at a vertical angle of 90 ℃, and the upper nozzle and the lower nozzle are easy to directly scour with each other to generate erosion and generate a gap to generate a steel clamping phenomenon. In addition, the maximum outer diameter of the zirconium core in the upper water inlet and the lower water inlet is 45mm, and under the condition of improving the pulling speed, the molten steel with high flow speed strongly scours the inner wall of the zirconium core, so that the pore diameter in the zirconium core is continuously enlarged, the wall of the zirconium core is continuously thinned and even penetrates through the zirconium core, and the steel leakage phenomenon is caused, and the safety accident is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a continuous casting molten steel tundish nozzle for overcoming the defects of the prior art, which enlarges the diameters of the zirconium cores in the upper nozzle and the lower nozzle so as to adapt to the scouring of molten steel to the zirconium cores in high-pulling-speed production; the inlet of the zirconium core of the upper nozzle and the inlet of the zirconium core of the lower nozzle are both provided with chamfers, so that the direct scouring of the high-flow-rate molten steel on the inlet of the zirconium core is slowed down, the service life of the zirconium core is prolonged, and the probability of steel clamping caused by the generation of gaps due to scouring between the upper nozzle and the lower nozzle is reduced.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides a continuous casting molten steel tundish mouth of a river, the mouth of a river includes mouth of a river and lower mouth of a river, the mouth of a river is inlayed in the brick cup to the interval is fixed in the bottom plate of middle inclusion, the upper end of lower mouth of a river with mouth of a river lower extreme sealing contact, the mouth of a river includes mouth of a river parent, first zirconium core and first molten steel flow through hole, first zirconium core inlay set up in the mouth of a river parent, set up first molten steel flow through hole in the first zirconium core, first zirconium core sets up to the cylinder type, its external diameter d1The diameter of the first molten steel flowing hole is 20-22mm, the inner wall of the upper inlet of the upper nozzle parent body is obliquely arranged, and the chamfer angle beta of the inner wall is 50-65mm1Is 30-45 degrees, the inner wall of the upper water inlet of the first zirconium core is obliquely arranged and is used for preventing the water from flowing out of the water inletChamfer angle alpha1Is 30-45 degrees and beta1≥α1；
The lower nozzle comprises a lower nozzle parent body, a second zirconium core and a second molten steel flow through hole, the second zirconium core is embedded in the lower nozzle parent body, the second molten steel flow through hole is formed in the second zirconium core, the second zirconium core is cylindrical, the outer diameter of the second zirconium core is the same as that of the first zirconium core, the aperture of the second molten steel flow through hole is the same as that of the first molten steel flow through hole, the inner wall of a molten steel inlet at the upper end of the second zirconium core is obliquely arranged, and an oblique chamfer angle alpha is formed2The angle is 30-60 degrees, and the second molten steel flowing hole is aligned with the second molten steel flowing hole in the water feeding port and is arranged on the same central axis.
The height h of the first zirconium core is larger than that of the continuous casting molten steel tundish nozzle1Is 80-90 mm.
Above-mentioned continuous casting molten steel tundish mouth, be provided with the steel bushing outside the lower mouth of a river parent, the thickness of steel bushing is 2mm, and length is 4/5 of lower mouth of a river parent lateral wall length, by lower mouth of a river parent lower limb upwards sets up.
The upper end of the lower nozzle parent body is provided with the mounting block, and the mounting block and the lower nozzle parent body are integrally formed.
Above-mentioned continuous casting molten steel tundish mouth of a river, the installation piece sets up to the cuboid, and is 65mm, wide for 85mm, the height is 25mm for the length.
Above-mentioned continuous casting molten steel tundish mouth of a river, the installation piece sets up to rectangular trapezium, and the height is 25mm, the long limit of installation piece upper end is less than the long limit of lower extreme, and the long limit of lower extreme is 65mm, and is 85mm wide.
The continuous casting molten steel tundish nozzle is characterized in that the upper nozzle parent body and the lower nozzle parent body are both of aluminum carbon circular truncated cone type, the diameter of an upper circle of the upper nozzle parent body is smaller than that of a lower circle, the diameter of the upper circle is 85mm, the diameter of the lower circle is 150mm, the height of the upper circle is 150mm, the diameter of an upper circle of the lower nozzle parent body is larger than that of the lower circle, the diameter of the upper circle is 120mm, the diameter of the lower circle is 75mm, and the height of the lower circle is 80-100 mm.
The above-mentioned continuous casting molten steelA water outlet at the lower end of the second zirconium core is away from the lower edge of the parent body of the lower water outlet by a distance h220-30mm, the inner wall of the water outlet end of the matrix of the lower nozzle is obliquely arranged, and the inclination angle beta2Is 30 degrees to 45 degrees.
In the continuous casting molten steel tundish nozzle, the apparent porosity of the first zirconium core and the apparent porosity of the second zirconium core are both 13%, and the volume density is 5.3 (g/cm)3）。
The utility model has the advantages that: the diameter of the zirconium core in the upper nozzle and the lower nozzle of the utility model is enlarged and set to be 50-65mm, which can be flexibly adjusted, effectively adapt to the high pulling speed production condition, delay the erosion speed of high flow speed molten steel to the zirconium core, prolong the service life of the zirconium core and prolong the whole service life of the upper nozzle and the lower nozzle; the molten steel inlets of the upper nozzle parent body and the first zirconium core are obliquely arranged, the chamfer angle is 30-45 degrees, the scouring of high-flow-rate molten steel on the zirconium core is effectively slowed down, and the service life of the zirconium core is prolonged; the outlet of the molten steel inlet at the upper end of the second zirconium core of the lower nozzle is provided with a chamfer angle of 30-60 degrees, so that the backflow of the molten steel flowing out of the upper nozzle at the position is increased, the straight-face scouring of the high-flow-rate molten steel on the second zirconium core is effectively slowed down, and the service life of the second zirconium core is prolonged; the chamfer angle is arranged, so that the inlet channel of the first molten steel flowing hole, through which the molten steel flows from the second molten steel flowing hole in the upper water gap into the lower water gap, is widened from narrow to wide, and the probability of steel clamping caused by a gap generated by scouring between the upper water gap and the lower water gap is reduced; the upper end part of the drainage port matrix is processed into a cuboid or trapezoidal mounting block, so that the on-site drainage port is convenient to replace; the outer wall of the lower nozzle parent body is provided with the steel sleeve, so that the impact of external force on the lower nozzle parent body when the lower nozzle is replaced is relieved, and the service life of the lower nozzle parent body is prolonged; the height of the first zirconium core of the water feeding port is increased to 80-90mm, and the service life of the water feeding port is further prolonged.
Drawings
The present invention will be further explained with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic view of a portion a of the nozzle in fig. 1.
In the figure: 1. an intermediate bag body; 2. a water feeding port; 2-1, a water feeding port matrix; 2-2, a first zirconium core; 2-3, enabling the first molten steel to flow through the hole; 3. a water outlet; 3-1, a drainage port matrix; 3-2, a second zirconium core; 3-3, allowing the second molten steel to flow through the hole; 4. brick setting; 5. steel jacket; 6. and (7) installing the block.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1 and 2, the utility model relates to a continuous casting molten steel tundish nozzle, the mouth of a river includes upper nozzle 2 and lower mouth of a river 3, upper nozzle 2 inlays in brick cup 4 to the interval is fixed in the bottom plate of middle inclusion 1, lower mouth of a river 3 the upper end with upper nozzle 2 lower extreme sealing contact, through briquetting fixed connection, in the molten steel in the ladle is poured into the tundish, the molten steel flows through the lower mouth of a river by the upper nozzle, and the outflow gets into the internal sizing type of continuous casting crystallizer and goes out the base. The upper nozzle 2 comprises an upper nozzle parent body 2-1, a first zirconium core 2-2 and a first molten steel flow through hole 2-3, the first zirconium core 2-2 is embedded in the upper nozzle parent body 2-1, the first molten steel flow through hole 2-3 is arranged in the first zirconium core, the first zirconium core is cylindrical, and the outer diameter d of the first zirconium core is larger than the outer diameter of the first molten steel flow through hole 2-31The diameter of the first molten steel flowing hole is 20-22mm, the inner wall of the upper inlet of the upper nozzle parent body 2-1 is obliquely arranged, and the chamfer angle beta of the inner wall is 50-65mm130 to 45 degrees, preferably 45 degrees, the inner wall of the upper water inlet of the first zirconium core 3 to 12 is obliquely arranged, and the chamfer angle alpha is1Is 30 DEG to 45 DEG, preferably 30 DEG, while the height h of the first zirconium core 2-2 is set1The thickness is increased to 80-90mm, and the impact resistance of the zirconium core to molten steel is improved. The molten steel is slowly poured into the first molten steel flowing hole from the inlet of the water feeding port under the chamfering effect, and strong scouring of the high-flow molten steel on the inlet of the first zirconium core is slowed down. Stepped chamfer (beta)1And alpha1) Set up, i.e. beta1≥α1And the scouring action force of the molten steel on the upper edge of the first zirconium core is slowed down, and the service life of the first zirconium core is prolonged.
The lower nozzle 3 comprises a lower nozzle parent body 3-1, a second zirconium core 3-2 and a second molten steel flowing hole 3-3, the second zirconium core 3-2 is embedded in the lower nozzle parent body 3-1, and the second zirconium core is arranged in the second zirconium coreA second molten steel flow hole 3-3, wherein the second zirconium core is cylindrical and has the same outer diameter as the first zirconium core 2-2, the diameter of the second molten steel flow hole is the same as that of the first molten steel flow hole, the inner wall of the molten steel inlet at the upper end of the second zirconium core 3-2 is obliquely arranged, and an oblique chamfer angle alpha is formed230-60 degrees, preferably 30 degrees, and the second molten steel flowing hole 3-3 is aligned with the second molten steel flowing hole 2-3 in the upper nozzle 2 and is arranged on the same central axis. The molten steel flowing out from the first molten steel flow through the hole is chamfered at the angle alpha2The molten steel slowly enters the second molten steel flowing hole, so that the molten steel is prevented from scouring the second zirconium core at high speed; in addition, by utilizing the principle of expanding and gathering of the chamfer angle, the molten steel in the tundish can smoothly flow downwards, and the probability of clamping the steel between the upper nozzle and the lower nozzle is reduced.
The apparent porosity of the first zirconium core 2-2 and the apparent porosity of the second zirconium core 3-2 are both 13%, and the volume density is both 5.3 (g/cm)3) The erosion resistance of the zirconium core is improved, and the service life of the zirconium core is prolonged.
The lower nozzle matrix 3-1 is in a circular truncated cone shape, the diameter of an upper circle of the circular truncated cone is larger than that of a lower circle of the circular truncated cone, the diameter of the upper circle is 120mm, the diameter of the lower circle is 75mm, and the height of the upper circle is 80-100 mm. A steel sleeve 5 is arranged outside the lower nozzle parent body 3-1, the thickness of the steel sleeve 5 is 2mm, the length of the steel sleeve is 4/5 of the length of the outer side wall of the lower nozzle parent body 3-1, and the steel sleeve is upwards arranged from the lower edge of the lower nozzle parent body 3-1. When the lower nozzle is replaced, the steel sleeve can effectively slow down the external impact on the lower nozzle matrix, and the service life of the lower nozzle matrix is prolonged.
The upper end of the lower nozzle parent body 3-1 is provided with an installation block 6 which is integrally formed and made of the same material, and the installation block is cuboid or trapezoidal, so that the replacement of the lower nozzle on site and the butt joint installation of the lower nozzle and the upper nozzle are facilitated.
Under the condition of the same pulling speed, the zirconium cores in the upper water gap and the lower water gap are selected to have the same size, and the aperture of the first molten steel flowing hole is the same as that of the second molten steel flowing hole. The diameter of the zirconium core in the water feeding port, the aperture of a first molten steel flowing hole, the height of the zirconium core, the inlet chamfer of the parent body of the water feeding port and the arrangement of the inlet chamfer of the zirconium core need to be adjusted according to the field production condition; similarly, the outer diameter of the zirconium core of the lower nozzle (sliding block) can be designed automatically, and can be replaced at any time according to the field production condition, so that the flexibility is high, and the usability is high. The diameter of the zirconium core in the water feeding port and the water discharging port is required to be the same.
Selection relationship between zirconium core outer diameter and pulling rate and pore diameter: in the continuous casting process, the maximum outer diameter of the conventional zirconium core is 45mm, the applicable maximum drawing speed is 2.5 m/min, the maximum pore diameter of the corresponding first molten steel flowing hole and the second molten steel flowing hole is 20mm, the drawing speed is increased advocate to improve the production, the larger the drawing speed is, the larger the pore diameter of the selected zirconium core is, the larger the pore diameter is, the thinner the wall thickness of the zirconium core is, under the scouring of high-flow molten steel, the scouring resistance of the zirconium core against the molten steel is reduced, the maximum value of the pore diameter is limited to ensure the normal service life of the zirconium core, so that the improvement of the drawing speed is limited, and the effect of improving the production cannot be achieved.
The utility model discloses enlarge the external diameter of first zirconium core and second zirconium core to 50-65mm, preferred external diameter is 50mm, 55mm, 60mm and 65 mm. The diameter of the adaptable hole reaches 20-22mm, and the pulling speed range is increased to 2.6-3.1 m/min. Under the condition of selection of a continuous casting crystallizer, when the outer diameter of a zirconium core is smaller than 50mm, and during high-pulling-speed production, the aperture of a molten steel flowing through a hole needs to be increased to improve the pulling speed, the thickness of the wall of the zirconium core is correspondingly reduced, the strong scouring capability of the zirconium core for resisting high-flow-rate molten steel is reduced, and the service life of the zirconium core is shortened; but if the external diameter size of zirconium core is greater than 65mm, then the wall thickness of mouth of a river parent and lower mouth of a river parent will corresponding reduce, and its guard action to the zirconium core just can weaken, consequently, satisfying under the high speed of drawing production condition, can prolong the life of zirconium core, can not influence the guard action of mouth of a river parent to the zirconium core again, the utility model discloses the external diameter of selected zirconium core is 50-65 mm. The correspondence between the outer diameter of the zirconium core and the pulling rate is shown in table 1 below.
TABLE 1 relationship between the outer diameter of the zirconium core and the pulling rate and the pore diameter
Claims (9)
1. The utility model provides a continuous casting molten steel tundish mouth of a river, the mouth of a river includes mouth of a river (2) and lower mouth of a river (3), mouth of a river (2) are inlayed in brick cup (4) on going up to the interval is fixed in the bottom plate of middle inclusion (1), the upper end of lower mouth of a river (3) with mouth of a river (2) lower extreme sealing contact, its characterized in that: the upper nozzle (2) comprises an upper nozzle parent body (2-1), a first zirconium core (2-2) and a first molten steel flow through hole (2-3), the first zirconium core (2-2) is embedded in the upper nozzle parent body (2-1), the first molten steel flow through hole (2-3) is formed in the first zirconium core, the first zirconium core is cylindrical, and the outer diameter d of the first zirconium core is larger than that of the first molten steel flow through hole1The diameter of the first molten steel flowing hole (2-3) is 20-22mm, the inner wall of the upper inlet of the upper nozzle parent body (2-1) is obliquely arranged, and the chamfer angle beta of the upper inlet is beta1Is 30-45 degrees, the inner wall of the upper water inlet of the first zirconium core (2-2) is obliquely arranged, and the chamfer angle alpha is1Is 30-45 degrees and beta1≥α1；
The lower nozzle (3) comprises a lower nozzle parent body (3-1), a second zirconium core (3-2) and a second molten steel flow through hole (3-3), the second zirconium core (3-2) is embedded in the lower nozzle parent body (3-1), the second molten steel flow through hole (3-3) is formed in the second zirconium core, the second zirconium core is cylindrical, the outer diameter of the second zirconium core is the same as that of the first zirconium core (2-2), the aperture of the second molten steel flow through hole is the same as that of the first molten steel flow through hole, the inner wall of the upper molten steel inlet of the second zirconium core (3-2) is obliquely arranged, and an oblique chamfer angle alpha is obliquely arranged2The angle is 30-60 degrees, and the second molten steel flowing hole (3-3) and the first molten steel flowing hole (2-3) in the upper nozzle (2) are aligned and arranged on the same central axis.
2. The continuous casting molten steel tundish nozzle of claim 1, wherein: the height h of the first zirconium core (2-2)1Is 80-90 mm.
3. The continuous casting molten steel tundish nozzle of claim 2, wherein: a steel sleeve (5) is arranged outside the lower nozzle parent body (3-1), the thickness of the steel sleeve (5) is 2mm, the length of the steel sleeve is 4/5 of the length of the outer side wall of the lower nozzle parent body (3-1), and the steel sleeve is arranged upwards from the lower edge of the lower nozzle parent body (3-1).
4. The nozzle of the continuous casting molten steel tundish of claim 3, wherein: the upper end of the lower nozzle parent body (3-1) is provided with an installation block (6), and the installation block and the lower nozzle parent body are integrally formed.
5. The nozzle of the continuous casting molten steel tundish of claim 4, wherein: the mounting block (6) is a cuboid which is 65mm long, 85mm wide and 25mm high.
6. The nozzle of the continuous casting molten steel tundish of claim 4, wherein: the mounting block (6) is trapezoidal and 25mm high, the long edge of the upper end of the mounting block is smaller than the long edge of the lower end of the mounting block, the long edge of the lower end of the mounting block is 65mm long, and the width of the mounting block is 85 mm.
7. The nozzle of a continuous casting molten steel tundish according to claim 5 or 6, wherein: the upper nozzle parent body (2-1) and the lower nozzle parent body (3-1) are both arranged to be of aluminum carbon circular truncated cone type, the diameter of an upper circle of the upper nozzle parent body (2-1) is smaller than that of a lower circle, the diameter of the upper circle is 85mm, the diameter of the lower circle is 150mm, the height is 150-200mm, the diameter of an upper circle of the lower nozzle parent body (3-1) is larger than that of the lower circle, the diameter of the upper circle is 120mm, the diameter of the lower circle is 75mm, and the height is 80-100 mm.
8. The nozzle of the continuous casting molten steel tundish of claim 7, wherein: the distance h between the water outlet at the lower end of the second zirconium core (3-2) and the lower edge of the lower nozzle parent body (3-1)220-30mm, the inner wall of the water outlet end of the lower nozzle parent body (3-1) is obliquely arranged, and the inclination angle beta2Is 30-45 degrees.
9. The nozzle of the continuous casting molten steel tundish of claim 8, wherein: the apparent porosity of the first zirconium core (2-2) and the apparent porosity of the second zirconium core (3-2) are both 13%, and the volume density is 5.3 (g/cm)3）。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021218356.XU CN213496468U (en) | 2020-06-28 | 2020-06-28 | Continuous casting molten steel tundish nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021218356.XU CN213496468U (en) | 2020-06-28 | 2020-06-28 | Continuous casting molten steel tundish nozzle |
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| Publication Number | Publication Date |
|---|---|
| CN213496468U true CN213496468U (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021218356.XU Active CN213496468U (en) | 2020-06-28 | 2020-06-28 | Continuous casting molten steel tundish nozzle |
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| CN (1) | CN213496468U (en) |
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- 2020-06-28 CN CN202021218356.XU patent/CN213496468U/en active Active
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