FERRULE DEVICE OF TUNDISH NOZZLE FOR REDUCING INCLUSIONS IN STEEL

Abstract

A ferrule device of tundish nozzle for reducing inclusions in steel contains a ferrule, a ferrule base and a wire. Structure of the ferrule is circular cylinder; inner diameter of the ferrule is same to outer diameter of matched immersion nozzle. A ferrule wire hole is set on bottom of the ferrule. The ferrule is detachably connected with the top of the ferrule base. A base wire hole throughout top surface and bottom surface of the ferrule base is set on the ferrule base. The diameter of the base wire hole is same to the diameter of the ferrule wire hole. The ferrule device of the present disclosure is easy to install and change. Installing and change process and filling of refractory material of the tundish process can be carried out simultaneously. Continuous casting process is not influenced.

Claims

1. A ferrule device of tundish nozzle for reducing inclusions in steel, characterized in that contains a ferrule, a ferrule base and a wire; structure of the ferrule is circular cylinder; inner diameter of the ferrule is same to outer diameter of matched immersion nozzle; a ferrule wire hole is set on bottom of the ferrule; the ferrule is detachably connected with the top of the ferrule base; a base wire hole throughout top surface and bottom surface of the ferrule base is set on the ferrule base.

2. The ferrule device of tundish nozzle for reducing inclusions in steel according to claim 1, characterized in that outer diameter of the ferrule is larger than the inner diameter of the ferrule by 100-150 mm; height of the ferrule is 60-100 mm.

3. The ferrule device of tundish nozzle for reducing inclusions in steel according to claim 1, characterized in that diameter of the ferrule wire hole is 8-15 mm; Depth of the ferrule wire hole is 30-50 mm.

4. The ferrule device of tundish nozzle for reducing inclusions in steel according to claim 1, characterized in that structure of the ferrule base is quadrangular podetium; central structure the ferrule base is hollow cylinder.

5. The ferrule device of tundish nozzle for reducing inclusions in steel according to claim 1, characterized in that diameter of the base wire hole is same to the diameter of the ferrule wire hole.

6. The ferrule device of tundish nozzle for reducing inclusions in steel according to claim 1, characterized in that inner diameter of the ferrule base is same to the outer diameter of matched immersion nozzle; side length of the top surface and bottom surface of the ferrule base is larger than the outer diameter of the ferrule by 50-80 mm; height of the ferrule base is 100-200 mm.

7. The ferrule device of tundish nozzle for reducing inclusions in steel according to claim 1, characterized in that the ferrule and the ferrule base are both made by graphite material with good electrical conductivity; binding agent of sintered material is electroconductive resin; porosity of the ferrule and the ferrule base is not higher than 5%; density of the ferrule and the ferrule base is not lower than 1.75 g/cm.sup.3.

8. The ferrule device of tundish nozzle for reducing inclusions in steel according to claim 1, characterized in that material of wire is pure copper, nickel-clad pure copper or pure nickel; heat resistant and insulating mica material is covered on the outside of the wire.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present disclosure or prior art, drawings are used in the embodiments or the description of the prior art will be briefly introduced below. It should be understood that, the drawings in the following description are only examples of the present disclosure. For those skilled person in the art, other drawings can be obtained on these drawings without creative works.

[0025] FIG. 1 is a perspective view of the ferrule device in the present disclosure.

[0026] FIG. 2A is a distribution diagram of the nonmetallic inclusions of the tundish in the Example 1.

[0027] FIG. 2B is a distribution diagram of the nonmetallic inclusions of the casting samples in the Example 1.

[0028] FIG. 3A is a distribution diagram of the nonmetallic inclusions of the tundish in the Example 2.

[0029] FIG. 3B is a distribution diagram of the nonmetallic inclusions of the casting samples in the Example 2.

[0030] In figures, 1ferrule, 2ferrule wire hole, 3ferrule base, 4base wire hole, 5wire.

[0031] Further illustration about achievements of the object, functions and advantages of the present disclosure is showed according to the drawings.

DETAILED DESCRIPTION OF THE INVENTION

[0032] A clear and complete description is made below in conjunction with the technical solutions in the embodiments. Apparently, the described embodiments are only some of the embodiments of the present disclosure, but not all of them. Based on the embodiments of the present disclosure, all other embodiments obtained by persons of ordinary skilled person in the art without creative efforts fall within the scale of claims in the present disclosure.

[0033] According to one aspect of the present disclosure, the following technical solution is provided.

[0034] The ferrule device of tundish nozzle for reducing inclusions in steel, contains a ferrule 1, a ferrule base 3 and a wire 5.

[0035] Structure of the ferrule 1 is circular cylinder. Inner diameter of the ferrule 1 is same to outer diameter of matched immersion nozzle. A ferrule wire hole 2 is set on bottom of the ferrule 1. The ferrule 1 is detachably connected with the top of the ferrule base, which ensures that the ferrule 1 damaged by erosion can be changed easily. A base wire hole throughout top surface and bottom surface of the ferrule base 4 is set on the ferrule base 3.

[0036] Furthermore, outer diameter of the ferrule 1 is larger than the inner diameter of the ferrule 1 by 100-150 mm. Height of the ferrule 1 is 60-100 mm.

[0037] Furthermore, diameter of the ferrule wire hole 2 is 8-15 mm. Depth of the ferrule wire hole 2 is 30-50 mm.

[0038] Furthermore, structure of the ferrule base 3 is quadrangular podetium. Central structure the ferrule base 3 is hollow cylinder. The diameter of the base wire hole 4 is same to the diameter of the ferrule wire hole 2. Inner diameter of the ferrule base 3 is same to the outer diameter of matched immersion nozzle. Side length of the top surface and bottom surface of the ferrule base 3 is larger than the outer diameter of the ferrule 1 by 50-80 mm. Height of the ferrule base 3 is 100-200 mm.

[0039] Furthermore, the ferrule 1 and the ferrule base 3 are both made by graphite material with good electrical conductivity. Binding agent of sintered material is electroconductive resin. Porosity of the ferrule and the ferrule base is not higher than 5%. Density of the ferrule and the ferrule base is not lower than 1.75 g/cm.sup.3.

[0040] Furthermore, material of wire 5 is pure copper, nickel-clad pure copper or pure nickel. Heat resistant and insulating mica material is covered on the outside of the wire.

[0041] Furthermore, types of steel applied by the ferrule device of tundish nozzle for reducing inclusions in steel contains carbon steel, sulfur bearing steel, rare earth steel and titian bearing steel.

[0042] According to another aspect of the present disclosure, the following technical solution is provided.

[0043] The use method of the above-mentioned ferrule device of tundish nozzle for reducing inclusions in steel, contains following steps,

[0044] S1, putting the ferrule base 3 on the location of inner bottom of tundish where immersion nozzle is set, putting the ferrule 1 on the top of the ferrule base 3, and inserting the wire 5 into the ferrule wire hole 2 and the base wire hole 4.

[0045] S2, putting the immersion nozzle through the ferrule 1 and the ferrule base 3, and stretching it out the bottom of the tundish. Sealing gap among the ferrule 1, the ferrule base 3, the immersion nozzle and the refractory material of the tundish by heat resistant mud. It's necessary to ensure height of bowl top of the immersion nozzle of the tundish is same to top surface of the ferrule 1 and refractory material in bottom surface of the tundish.

[0046] S3, connecting the wire to one electrode of external power supply and connecting another electrode of the external power supply to inside of the tundish to form a closed circuit in the steel, generate a stable gradient electric field, control inclusion movement of the tundish, which results to decreasing the amount of the inclusions in the tundish.

[0047] Furthermore, in the step S3, the external power supply is direct current power supply, alternating current power supply or pulse power supply.

[0048] Furthermore, in the step S1, the tundish is one device with one flow, or one device with many flows.

[0049] Further illustration about the technical solutions of the present disclosure is showed according to examples.

Example 1

[0050] The use method of the ferrule device of tundish nozzle for reducing inclusions in 40 Cr steel was provided. The tundish was one device with six flows. The inner diameter, the outer diameter and the height of the ferrule were 140 mm, 250 mm and 80 mm respectively. The hole diameter and the depth of the ferrule wire hole were 10 mm and 40 mm respectively. The side length and the height of the ferrule base were 300 mm and 120 mm respectively. The ferrule and the ferrule base were both made by graphite material with good electrical conductivity. The binding agent of sintered material was electroconductive resin. The porosity of the ferrule and the ferrule base was 5%. The density of the ferrule and the ferrule base was 1.75 g/cm.sup.3. The material of wire was pure copper. The heat resistant and insulating mica material was covered on the outside of the wire.

[0051] The use method contained following steps,

[0052] S1, during the preparation process of tundish, the ferrule base was put on the location of the inner bottom of tundish where the immersion nozzle was set. The ferrule was put on the top of the ferrule base. the wire was inserted into the ferrule wire hole and the base wire hole.

[0053] S2, the immersion nozzle was put through the ferrule and the ferrule base, and stretched out the bottom of the tundish. The gap among the ferrule, the ferrule base, the immersion nozzle and the refractory material of the tundish was sealed by the heat resistant mud. Wherein, the height of the bowl top of the immersion nozzle of the tundish should be same to the top surface of the ferrule and the refractory material in the bottom surface of the tundish.

[0054] S3, the wire was connected to the one electrode of the external power supply. Another electrode of the external power supply was connected to the inside of the tundish to form a closed circuit in the steel, generate a stable gradient electric field and control inclusion movement of the tundish, which resulted to decreasing the inclusion in the tundish.

[0055] The tundish sample and the casting sample of third furnace of the continuous casting was taken as shown in FIGS. 2A-2B. The distribution of the tundish sample was shown in FIG. 2A. The distribution of the casting sample was shown in FIG. 2B. The size and the distribution were counted respectively. After using the ferrule device to decrease the inclusions in steel of this example, the amount density of the inclusions in the tundish is 9.79 per mm.sup.2. The amount density of the inclusions in continuous casting billet is 6.27 per mm.sup.2. The amount of the inclusions was decreased by 30% after using the ferrule device to decrease the inclusions in steel of this example.

Example 2

[0056] The use method of the ferrule device of tundish nozzle for reducing inclusions in Q235B steel was provided. The tundish was one device with six flows. The inner diameter, the outer diameter and the height of the ferrule were 110 mm, 200 mm and 70 mm respectively. The hole diameter and the depth of the ferrule wire hole were 8 mm and 35 mm respectively. The side length and the height of the ferrule base were 260 mm and 100 mm respectively. The ferrule and the ferrule base were both made by graphite material with good electrical conductivity. The binding agent of sintered material was electroconductive resin. The porosity of the ferrule and the ferrule base was 4.7%. The density of the ferrule and the ferrule base was 1.82 g/cm.sup.3. The material of wire was pure nickel. The heat resistant and insulating mica material was covered on the outside of the wire.

[0057] The use method contained following steps,

[0058] S1, during the preparation process of tundish, the ferrule base was put on the location of the inner bottom of tundish where the immersion nozzle was set. The ferrule was put on the top of the ferrule base. the wire was inserted into the ferrule wire hole and the base wire hole.

[0059] S2, the immersion nozzle was put through the ferrule and the ferrule base, and stretched out the bottom of the tundish. The gap among the ferrule, the ferrule base, the immersion nozzle and the refractory material of the tundish was sealed by the heat resistant mud. Wherein, the height of the bowl top of the immersion nozzle of the tundish should be same to the top surface of the ferrule and the refractory material in the bottom surface of the tundish.

[0060] S3, the wire was connected to the one electrode of the external power supply. Another electrode of the external power supply was connected to the inside of the tundish to form a closed circuit in the steel, generate a stable gradient electric field and control inclusion movement of the tundish, which resulted to decreasing the inclusion in the tundish.

[0061] The tundish sample and the casting sample of fourth furnace of the continuous casting was taken as shown in FIGS. 3A-3B. The distribution of the tundish sample was shown in FIG. 3A. The distribution of the casting sample was shown in FIG. 3B. The size and the distribution were counted respectively. After using the ferrule device to decrease the inclusions in steel of this example, the amount density of the inclusions in the tundish is 8.48 per mm.sup.2. The amount density of the inclusions in continuous casting billet is 4.58 per mm.sup.2. The amount of the inclusions was decreased by 46% after using the ferrule device to decrease the inclusions in steel of this example.

Example 3

[0062] The use method of the ferrule device of tundish nozzle for reducing inclusions in GCr15 steel was provided. The tundish was one device with three flows. The inner diameter, the outer diameter and the height of the ferrule were 100 mm, 180 mm and 60 mm respectively. The hole diameter and the depth of the ferrule wire hole were 8 mm and 30 mm respectively. The side length and the height of the ferrule base were 260 mm and 100 mm respectively. The ferrule and the ferrule base were both made by graphite material with good electrical conductivity. The binding agent of sintered material was electroconductive resin. The porosity of the ferrule and the ferrule base was 4.2%. The density of the ferrule and the ferrule base was 1.85 g/cm.sup.3. The material of wire was pure nickel. The heat resistant and insulating mica material was covered on the outside of the wire.

[0063] The use method contained following steps,

[0064] S1, during the preparation process of tundish, the ferrule base was put on the location of the inner bottom of tundish where the immersion nozzle was set. The ferrule was put on the top of the ferrule base. the wire was inserted into the ferrule wire hole and the base wire hole.

[0065] S2, the immersion nozzle was put through the ferrule and the ferrule base, and stretched out the bottom of the tundish. The gap among the ferrule, the ferrule base, the immersion nozzle and the refractory material of the tundish was sealed by the heat resistant mud. Wherein, the height of the bowl top of the immersion nozzle of the tundish should be same to the top surface of the ferrule and the refractory material in the bottom surface of the tundish.

[0066] S3, the wire was connected to the one electrode of the external power supply. Another electrode of the external power supply was connected to the inside of the tundish to form a closed circuit in the steel, generate a stable gradient electric field and control inclusion movement of the tundish, which resulted to decreasing the inclusion in the tundish.

[0067] The tundish sample and the casting sample of sixth furnace of the continuous casting was taken. The size and the distribution were counted respectively. After using the ferrule device to decrease the inclusions in steel of this example, the amount density of the inclusions in the tundish is 5.95 per mm.sup.2. The amount density of the inclusions in continuous casting billet is 3.73 per mm.sup.2. The amount of the inclusions was decreased by 37% after using the ferrule device to decrease the inclusions in steel of this example.

Example 4

[0068] The use method of the ferrule device of tundish nozzle for reducing inclusions in F45MnVS steel was provided. The tundish was one device with three flows. The inner diameter, the outer diameter and the height of the ferrule were 140 mm, 240 mm and 80 mm respectively. The hole diameter and the depth of the ferrule wire hole were 12 mm and 40 mm respectively. The side length and the height of the ferrule base were 300 mm and 120 mm respectively. The ferrule and the ferrule base were both made by graphite material with good electrical conductivity. The binding agent of sintered material was electroconductive resin. The porosity of the ferrule and the ferrule base was 4.3%. The density of the ferrule and the ferrule base was 1.88 g/cm.sup.3. The material of wire was pure nickel. The heat resistant and insulating mica material was covered on the outside of the wire.

[0069] The use method contained following steps,

[0070] S1, during the preparation process of tundish, the ferrule base was put on the location of the inner bottom of tundish where the immersion nozzle was set. The ferrule was put on the top of the ferrule base. the wire was inserted into the ferrule wire hole and the base wire hole.

[0071] S2, the immersion nozzle was put through the ferrule and the ferrule base, and stretched out the bottom of the tundish. The gap among the ferrule, the ferrule base, the immersion nozzle and the refractory material of the tundish was sealed by the heat resistant mud. Wherein, the height of the bowl top of the immersion nozzle of the tundish should be same to the top surface of the ferrule and the refractory material in the bottom surface of the tundish.

[0072] S3, the wire was connected to the one electrode of the external power supply. Another electrode of the external power supply was connected to the inside of the tundish to form a closed circuit in the steel, generate a stable gradient electric field and control inclusion movement of the tundish, which resulted to decreasing the inclusion in the tundish.

[0073] The tundish sample and the casting sample of fifth furnace of the continuous casting was taken. The size and the distribution were counted respectively. After using the ferrule device to decrease the inclusions in steel of this example, the amount density of the inclusions in the tundish is 5.82 per mm.sup.2. The amount density of the inclusions in continuous casting billet is 4.18 per mm.sup.2. The amount of the inclusions was decreased by 28% after using the ferrule device to decrease the inclusions in steel of this example.

Example 5

[0074] The use method of the ferrule device of tundish nozzle for reducing inclusions in 316 steel was provided. The tundish was one device with three flows. The inner diameter, the outer diameter and the height of the ferrule were 155 mm, 265 mm and 90 mm respectively. The hole diameter and the depth of the ferrule wire hole were 15 mm and 45 mm respectively. The side length and the height of the ferrule base were 320 mm and 120 mm respectively. The ferrule and the ferrule base were both made by graphite material with good electrical conductivity. The binding agent of sintered material was electroconductive resin. The porosity of the ferrule and the ferrule base was 3.3%. The density of the ferrule and the ferrule base was 1.92 g/cm.sup.3. The material of wire was pure copper. The heat resistant and insulating mica material was covered on the outside of the wire.

[0075] The use method contained following steps,

[0076] S1, during the preparation process of tundish, the ferrule base was put on the location of the inner bottom of tundish where the immersion nozzle was set. The ferrule was put on the top of the ferrule base. the wire was inserted into the ferrule wire hole and the base wire hole.

[0077] S2, the immersion nozzle was put through the ferrule and the ferrule base, and stretched out the bottom of the tundish. The gap among the ferrule, the ferrule base, the immersion nozzle and the refractory material of the tundish was sealed by the heat resistant mud. Wherein, the height of the bowl top of the immersion nozzle of the tundish should be same to the top surface of the ferrule and the refractory material in the bottom surface of the tundish.

[0078] S3, the wire was connected to the one electrode of the external power supply. Another electrode of the external power supply was connected to the inside of the tundish to form a closed circuit in the steel, generate a stable gradient electric field and control inclusion movement of the tundish, which resulted to decreasing the inclusion in the tundish.

[0079] The tundish sample and the casting sample of sixth furnace of the continuous casting was taken. The size and the distribution were counted respectively. After using the ferrule device to decrease the inclusions in steel of this example, the amount density of the inclusions in the tundish is 7.59 per mm.sup.2. The amount density of the inclusions in continuous casting billet is 3.58 per mm.sup.2. The amount of the inclusions was decreased by 53% after using the ferrule device to decrease the inclusions in steel of this example.

[0080] The ferrule device of tundish nozzle for reducing inclusions in steel in the present disclosure contained the ferrule, the ferrule base and the wire. The structure of the ferrule was the circular cylinder. The inner diameter of the ferrule was same to the outer diameter of the matched immersion nozzle. The ferrule wire hole was set on the bottom of the ferrule. The ferrule was detachably connected with the top of the ferrule base. The base wire hole throughout the top surface and the bottom surface of the ferrule base was set on the ferrule base. The diameter of the base wire hole was same to the diameter of the ferrule wire hole. The ferrule device of the present disclosure was easy to install and change. Installing and change process and filling of refractory material of the tundish process could be carried out simultaneously. Continuous casting process was not influenced. No other operation was needed to carry out till end of the continuous casting process. When using the ferrule device of the present disclosure, it could guarantee fluent electric circuit and generation of gradient electric field, which was benefit to the controlling of the inclusions. The inclusions of the casting samples were decreased by 28% or more, compared with the inclusions of the tundish samples.

[0081] The descriptions mentioned above are only some preferred embodiments of the present disclosure, which doesn't limit the claim scale of the present disclosure. The claim scale of the present disclosure contains any changes with same effects, direct or indirect application in other field according to the solutions of the present disclosure.