CN206092950U - Continuous casting is seal ring for protective casting - Google Patents

Abstract

The utility model discloses a sealing gasket for continuous casting protection casting, which optimizes the air flow field between the lower nozzle of the molten steel tank and the long nozzle protection pipe, and solves the problem of poor sealing effect of the existing sealing gasket. The scheme adopted by the utility model is: the sealing gasket for continuous casting protection casting includes a conical cylinder and a flange, wherein the flange is located at the end of the larger diameter of the conical cylinder and protrudes outward. At least one through hole is hollowed out at the edge connection. The sealing gasket for continuous casting protection casting is used between the lower nozzle of the molten steel tank and the shroud protection pipe. During the continuous casting production process, the inert gas blown from the shroud protection pipe, such as argon, can The flow between the tubes, and finally flow out, prevent the external air and the blown argon gas from entering the tundish with the steel flow to pollute the molten steel, improve the rolling quality and performance of the steel, and at the same time prevent the shroud protection tube from sticking Steel, easy to install and disassemble.

Description

Sealing gaskets for continuous casting protection casting

technical field

The utility model relates to a sealing washer, in particular to a sealing washer for continuous casting protection casting.

Background technique

During the continuous casting production process, the molten steel must avoid exposure to air or inhalation of air to avoid oxidation of the molten steel during the continuous casting production process, so the casting must be protected during the continuous casting production process. One of the existing treatment methods is that during the casting process, an aluminum-carbon long nozzle protection tube is placed on the nozzle at the bottom of the molten steel tank to prevent the molten steel in the molten steel tank from flowing into the tundish process through the nozzle of the molten steel tank in contact with and inhalation of air. However, there is a gap between the lower nozzle of the molten steel tank and the protection pipe of the long nozzle, and it is easy to inhale air to cause oxidation of the molten steel.

In order to improve the tightness, most steel mills often use sealing gaskets to connect. For example, the patent document with the notification number CN201308980Y discloses a sealing gasket, which includes a conical cylinder and a flange. The flange is located at the end of the conical cylinder with a larger diameter and protrudes outward.

The existing sealing gasket including the above sealing gasket only plays the role of connection and cushion, and the argon gas blown in from the shroud is blocked by the sealing gasket, which cannot play the effect of argon sealing. The sealing effect of the existing sealing gasket is poor, causing the argon gas to inhale air and enter the tundish along with the molten steel, causing secondary oxidation of the molten steel, affecting the quality of the steel and reducing the castability of the molten steel. At the same time, the [N] content in the steel increases due to the inhalation of air, and the average increase in [N] is 8-10ppm. During the solidification process of molten steel, it precipitates at the grain boundary in the form of nitrides and induces subcutaneous microcracks, which affects the rolling quality of steel. and performance.

Utility model content

The utility model provides a sealing gasket for continuous casting protection casting, which optimizes the air flow field between the lower nozzle of the molten steel tank and the shroud protection pipe, and solves the problem of poor sealing effect of the existing sealing gasket.

The technical solution adopted by the utility model to solve the technical problem is: the sealing gasket for continuous casting protection casting includes a conical cylinder and a flange, wherein the flange is located at the end of the conical cylinder with a larger diameter and protrudes outward. At least one through hole is hollowed out at the joint between the tapered barrel and the flange.

Further, 3 to 4 through holes are hollowed out at the joint between the tapered barrel and the flange, and the arc lengths between any two adjacent through holes are equal. That is, the through holes are arranged at equal intervals.

Further, the height of the conical cylinder is 70-80mm.

Specifically, the height of the tapered tube is 80 mm, the thickness is 10 mm, the inner diameters of the two ends of the tapered tube are 110 mm and 136 mm respectively; the ring width of the flange is 37 mm, and the thickness is 6 mm; the joint between the tapered tube and the flange is hollowed out. Form 4 through holes, the 4 through holes are equally spaced, and the width of the through holes is 24mm, the distance between the edge of the through hole near the smaller end of the tapered barrel and the edge of the flange near the smaller end of the tapered barrel is 5mm.

The beneficial effect of the utility model is that: the sealing gasket for continuous casting protection casting is adopted between the nozzle of the molten steel tank and the protective pipe of the long nozzle. During the continuous casting production process, the inert gas blown from the shroud protective tube, such as argon, can flow between the lower nozzle of the molten steel tank and the shroud protective tube, and finally flow out, blocking the external air and the blown argon Along with the steel flow, it enters the tundish to pollute the molten steel. Different from the traditional way of using plugging to keep the seal, another way is to hollow out the connection between the conical cylinder and the flange to form a through hole to form an argon sealing system, optimize the air flow field, and solve the problem of poor sealing effect of the existing sealing gasket.

Continuous casting protection The sealing gasket for casting makes a good argon gas ring between the nozzle of the molten steel tank and the shroud protection tube, realizes the tight fit between the shroud protection tube and the joint of the molten steel tank, and improves the protection of molten steel during the continuous casting production process Casting effect, reduce or prevent the molten steel in the molten steel tank from being oxidized by inhaling air during the process of flowing through the nozzle of the molten steel tank through the protective pipe of the long nozzle to the tundish, so as to achieve the purpose of improving the castability of the molten steel and controlling the [ The subcutaneous microcracks formed by the increase of N] content can improve the quality and performance of steel rolling, and can also prevent the shroud protection pipe from sticking to steel, which is convenient for installation and disassembly.

Description of drawings

Fig. 1 is a sectional view of the sealing gasket for continuous casting protection casting of the utility model.

Fig. 2 is a top view of the sealing gasket for continuous casting protection casting of the utility model.

Parts, parts and numbers in the figure: conical cylinder 1, flange 2, through hole 3. The units of dimensions marked in Fig. 1 and Fig. 2 are mm.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1 and Figure 2, the sealing gasket for continuous casting protection casting of the utility model includes a conical cylinder 1 and a flange 2, wherein the flange 2 is located at the end of the conical cylinder 1 with a larger diameter and protrudes outward. At least one through hole 3 is hollowed out at the junction of the conical cylinder 1 and the flange 2 . In order to ensure uniform air flow, the through holes 3 are arranged at equal intervals, and each through hole has the same shape and size. As shown in Figure 2, four through-holes 3 are hollowed out at the junction of the conical cylinder 1 and the flange 2, and the arc lengths between any two adjacent through-holes 3 are equal.

The height of the conical cylinder 1 is 70-80mm, for example 75mm. Compared with the ring body height of the existing sealing gasket, which is 50 mm, the height of the conical cylinder 1 is larger, which can better prevent the molten steel from forming nodules at the shroud, and is also convenient for cleaning the bowl of the shroud during casting. The conical cylinder 1 and the flange 2 are integrated, which can better form an argon sealing system and realize protective pouring.

Specifically, as shown in Figures 1 and 2, the height of the conical cylinder 1 is 80 mm, the thickness is 10 mm, and the inner diameters at both ends of the conical cylinder 1 are 110 mm and 136 mm, respectively. The flange 2 has a ring width of 37 mm and a thickness of 6 mm. The connection between the conical cylinder 1 and the flange 2 is hollowed out to form four through holes 3, which are distributed at equal intervals, and the width of the through holes 3 is 24mm. The distance between the edge 2 and the smaller end edge of the tapered cylinder 1 is 5mm.

The permissible deviation of the size of the sealing gasket for continuous casting protection casting should be ≤3mm. The physical and chemical indicators of the sealing gasket for continuous casting protection casting preferably meet the requirements in Table 1.

Table 1

The sealing gasket for continuous casting protection casting is hollowed out to form a through hole at the connection between the conical cylinder and the flange, which optimizes the air flow field and solves the problem of poor sealing effect of the existing sealing gasket.

During the continuous casting process, the inert gas blown from the shroud protection tube, such as argon, can flow between the lower nozzle of the molten steel tank and the shroud protection tube, and finally flow out to form an argon seal system to realize protective casting. The continuous casting protection casting sealing gasket reduces or avoids the oxidation of molten steel in the continuous casting production process, and the [N] amount of molten steel decreases from the original 8-10ppm to 0-5ppm, which improves the steel quality and castability of molten steel and steel rolling quality.

Claims (4)

1. continuous casting protective casting seal washer, including conically shaped (1) and flange (2), its flange (2) is positioned at conically shaped (1) The larger one end of bore, it is and outwardly, it is characterised in that：Formed at least in conically shaped (1) and flange (2) junction hollow out One through hole (3).

2. continuous casting protective casting seal washer as claimed in claim 1, it is characterised in that：The conically shaped (1) and flange (2) arc length that junction hollow out is formed between 3～4 through holes (3), and two through holes (3) of arbitrary neighborhood is equal.

3. continuous casting protective casting seal washer as claimed in claim 1, it is characterised in that：The height of the conically shaped (1) For 70～80mm.

4. continuous casting protective casting seal washer as claimed in claim 1, it is characterised in that：The height of the conically shaped (1) For 80mm, thickness is 10mm, and the internal diameter at conically shaped (1) two ends is respectively 110mm and 136mm；The ring width of flange (2) is 37mm, Thickness is 6mm；Conically shaped (1) and flange (2) junction hollow out 4 through holes (3) of formation, 4 through hole (3) equidistantly distributeds, and The width of through hole (3) is 24mm, a bore less end margin and flange (2) close taper of the through hole (3) near conically shaped (1) The distance of the less end margin of bore of cylinder (1) is 5mm.