CN212293704U

CN212293704U - Protective gas blowing device for 1Cr17Ni2 or 5CrNiMoV steel electroslag remelting process

Info

Publication number: CN212293704U
Application number: CN202020718919.5U
Authority: CN
Inventors: 钱德桥; 钱强; 常立忠
Original assignee: Maanshan Zhongqiao Metal Materials Co ltd
Current assignee: Maanshan Zhongqiao Metal Materials Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2021-01-05
Anticipated expiration: 2030-04-30

Abstract

The utility model belongs to the technical field of metal smelting, and relates to a protective gas blowing device in the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel; the side surface of the consumable electrode is vertically provided with the fusible blowing pipe, the fusible blowing pipe comprises a first fusible blowing pipe and a second fusible blowing pipe, and the bottom ends of the first fusible blowing pipe and the second fusible blowing pipe are respectively melted to form a first melting end and a second melting end which are respectively positioned above and below the upper surface of the slag pool; the utility model forms the melting ends at different positions relative to the slag pool through the difference of the melting points of the first melting blowing pipe and the second melting blowing pipe, thereby performing targeted blowing at different positions, and the protective gas blown by the first melting end positioned above the upper surface of the slag pool can perform effective gas seal on the upper surface of the slag pool in a targeted manner; the second melting end located below the upper surface of the slag pool blows protective gas, so that hydrogen in the slag pool and molten steel can be promoted to diffuse to bubbles, and the hydrogen content in the steel is reduced along with the overflow of the bubbles in the slag pool.

Description

Protective gas blowing device for 1Cr17Ni2 or 5CrNiMoV steel electroslag remelting process

Technical Field

The utility model belongs to the technical field of the metal smelting, more specifically say, relate to a 1Cr17Ni2 or 5CrNiMoV steel electroslag remelting process protection gas blowing device.

Background

The 1Cr17Ni2 series is a steel type of martensitic stainless steel with better matching of strength and toughness. It has good corrosion resistance to aqueous solutions of oxidizing acids, most organic acids and organic salts. It is suitable for manufacturing parts such as shafts, piston rods, pumps and the like which need to have toughness and corrosion resistance in the industries of nitric acid and acetic acid production, light industry, textile and the like. The 5CrNiMoV is high-wear-resistance hot forging die steel and has the following component design characteristics: good toughness, high strength and good wear resistance; the die steel produced by adopting an Electric Arc Furnace (EAF), refining (LT) and Vacuum (VD) has high purity and good performance.

The above-mentioned steel grades have excellent properties, and are widely used in specific fields, but similar to the above-mentioned steel grades, the above-mentioned steel grades are often smelted by means of electroslag remelting, and the smelting principle of electroslag remelting refers to fig. 1, in which molten alkaline slag is injected into a crystallizer 120 to form a slag bath 210, and one end of a consumable electrode 310 to be smelted is inserted into the slag bath; the consumable electrode 310, the slag bath 210, the metal melting bath 220, the cast ingot 230 and the bottom water tank 110 form a loop through a short-net cable and a transformer; the slag pool 210 is heated to high temperature by self resistance, the end part of the consumable electrode 310 is heated and melted by slag in the slag pool 210 to form metal molten drops, and then the metal molten drops fall off and pass through the slag pool 210 to enter the metal molten pool 220; because of the forced cooling function of the crystallizer 120, the liquid metal is rapidly solidified to form a spindle, the ingot 230 is sequentially solidified from bottom to top, so that the metal molten pool 220 and the slag pool 210 continuously move upwards, the ascending slag pool forms a slag shell on the inner wall of the water-cooled crystallizer 120, the slag shell not only enables the surface of the ingot 230 to be smooth and clean, but also plays an insulating role, and because the upper end of the ingot 230 is provided with a heat source, the bottom water tank 110 below has a refrigerating function, so that the ingot 230 is enabled to be crystallized from bottom to top.

However, in the process of electroslag remelting, it is necessary to avoid oxygen in the air from entering the slag bath 210, and gas sealing is often required, but general gas sealing equipment is complicated, the use cost is high, and effective gas sealing is difficult to be performed locally due to the high temperature of the upper surface of the slag bath 210. Other steel grades have high requirements for hydrogen content in the steel, and require lower hydrogen content in the steel.

SUMMERY OF THE UTILITY MODEL

1. Problems to be solved

Aiming at the technical problems that the existing equipment has high construction and use cost of gas seal equipment in the electroslag remelting process, is difficult to realize effective gas seal locally and cannot further remove hydrogen in steel, the protective gas blowing device for the electroslag remelting process of the 1Cr17Ni2 or 5CrNiMoV steel is provided, the consumable blowing pipe arranged on the consumable electrode can realize effective gas seal on the slag bath 210 around the consumable electrode, and the hydrogen content in the steel can be further removed and reduced.

2. Technical scheme

In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:

the utility model provides a 1Cr17Ni2 or 5CrNiMoV steel electroslag remelting process protection gas blowing device, the side at the consumable electrode is vertical to be provided with fusible blowing pipe, fusible blowing pipe includes the fusible blowing pipe of first fusible blowing pipe and the fusible blowing pipe of second, the bottom of the fusible blowing pipe melts and forms first end of melting, first end of melting is located the top of slag bath upper surface, the bottom of the fusible blowing pipe of second melts and forms the second and melts the end, the second melts the below that the end is located the slag bath upper surface.

Preferably, the first fusible blowing pipe is a red copper blowing pipe, and the second fusible blowing pipe is a pure iron blowing pipe.

Preferably, the distance from the first melting end to the upper surface of the slag bath is h1, and the h1 satisfies 3cm ≦ h1 ≦ 5 cm.

Preferably, the distance from the second melting end to the upper surface of the slag bath is h2, and the h2 satisfies 2cm ≦ h2 ≦ 3 cm.

Preferably, at least two first fusible blowing pipes are provided, and at least two second fusible blowing pipes are provided.

Preferably, the first fusible blowing pipe is bent.

Preferably, the first fusible blowing pipes are uniformly arranged in the circumferential direction of the consumable electrode; the second fusible blowing pipes are uniformly arranged in the circumferential direction of the consumable electrode.

Preferably, the included angle between the axial direction of the first fusible blowing pipe and the horizontal plane is alpha, and the alpha meets the condition that the alpha is more than or equal to 15 degrees and less than or equal to 75 degrees.

Preferably, the first fusible blowing pipes are arranged in a plurality, and the included angle between the axial direction of each first fusible blowing pipe and the horizontal plane is the same on the same height.

Preferably, the top end of the first fusible blowing pipe is connected with an air source through a first vent pipe; the top end of the second fusible blowing pipe is connected with an air source through a second vent pipe.

3. Advantageous effects

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a 1Cr17Ni2 or 5CrNiMoV steel electroslag remelting process protection gas blowing device, the side at the consumable electrode is provided with fusible blowpipe vertically, fusible blowpipe includes the fusible blowpipe of first fusible blowpipe and the fusible blowpipe of second, the bottom of the fusible blowpipe of first fusible blowpipe melts and forms first end of melting, the first end of melting is located the top of slag bath upper surface, the bottom of the fusible blowpipe of second melts and forms the second end of melting, the second end of melting is located the below of slag bath upper surface; the melting ends are formed at different positions relative to the slag pool through the difference of the melting points of the first fusible blowing pipe and the second fusible blowing pipe, so that the targeted blowing is performed at different positions, and the protective gas blown by the first melting end above the upper surface of the slag pool can be used for effectively sealing the upper surface of the slag pool in a targeted manner; the second melting end located below the upper surface of the slag pool blows protective gas, so that hydrogen in the slag pool and molten steel can be promoted to diffuse to bubbles, and the hydrogen content in the steel is reduced along with the overflow of the bubbles in the slag pool.

Drawings

FIG. 1 is a schematic view of the use state of a protective gas blowing device in the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel of the present invention;

FIG. 2 is a top view of the distribution of 2 times of the first and second fusible blowing pipes in the protective gas blowing device in the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel of the present invention;

fig. 3 is a top view of the protective gas blowing device of the 1Cr17Ni2 or 5CrNiMoV steel electroslag remelting process, wherein the number of the first fusible blowing pipes and the number of the second fusible blowing pipes are respectively 3 time-division distribution;

FIG. 4 is a schematic structural view of a first fusible blowing pipe in a protective gas blowing device in the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel of the present invention, which is bent;

fig. 5 is a distribution top view of the bent first fusible blowing pipe in the protective gas blowing device in the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel of the present invention.

The reference numbers in the figures illustrate:

110. a bottom water tank; 120. a crystallizer;

210. a slag pool; 220. a molten metal bath; 230. casting ingots;

310. a consumable electrode; 321. a first fusible blowing pipe; 322. a second fusible blowing pipe; 331. a first vent pipe; 332. a second vent pipe; 341. a first melt end; 342. a second melt end.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

In the protective gas blowing device for the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel in the embodiment, as shown in fig. 1, a consumable blowing tube is vertically arranged on the side surface of a consumable electrode 310, and the consumable blowing tube is attached to the side surface of the consumable electrode 310 after the consumable electrode 310 is cast. The fusible blowing pipe comprises a first fusible blowing pipe 321 and a second fusible blowing pipe 322, wherein the bottom end of the first fusible blowing pipe 321 is fused to form a first fused end 341, the first fused end 341 is positioned above the upper surface of the slag bath 210, the bottom end of the second fusible blowing pipe 322 is fused to form a second fused end 342, and the second fused end 342 is positioned below the upper surface of the slag bath 210. The top end of the first fusible blowing pipe 321 is connected with an air source through a first vent pipe 331; the top end of the second fusible blowing pipe 322 is connected to a gas source through a second vent pipe 332, and in this embodiment, the shielding gas in the gas source is argon.

At least two first fusible blowing pipes 321 are arranged, at least two second fusible blowing pipes 322 are arranged, and the first fusible blowing pipes 321 are uniformly arranged along the circumferential direction of the consumable electrode 310; the second fusible blowing pipes 322 are uniformly arranged along the circumferential direction of the consumable electrode 310, and the mode can ensure the uniformity of blowing and further improve the air sealing effect.

As shown in fig. 2, in the present embodiment, 2 first fusible blowing pipes 321 and 2 second fusible blowing pipes 322 are provided, 2 first fusible blowing pipes 321 are provided opposite to each other, 2 second fusible blowing pipes 322 are also provided opposite to each other, and the first fusible blowing pipes 321 and the adjacent second fusible blowing pipes 322 form an angle of 90 ° with respect to the axial center of the consumable electrode 310.

As shown in fig. 3, 3 first fusible blowing pipes 321 and 3 second fusible blowing pipes 322 may be provided, where 3 first fusible blowing pipes 321 form an included angle of 60 ° with respect to the axis of the consumable electrode 310, 3 second fusible blowing pipes 322 also form an included angle of 60 ° with respect to the axis of the consumable electrode 310, and a first fusible blowing pipe 321 and an adjacent second fusible blowing pipe 322 form an included angle of 30 ° with respect to the axis of the consumable electrode 310.

In the embodiment, the first fusible blowing pipe 321 is a red copper blowing pipe made of oxygen-free copper TU1, the melting point is lower than 1100 ℃, the wall thickness is 1-2mm, the inner diameter is 20-40mm, the bottom end of the first fusible blowing pipe 321 is close to the upper surface of the slag pool 210 and then can be fused to form a first fusing end 341, argon is also blown out from the first fusing end 341, the distance from the first fusing end 341 to the upper surface of the slag pool 210 is h1, h1 is more than or equal to 3cm and less than or equal to 5cm, and the flow of argon supplied by an air source is 3-6m³H; the blown argon forms a protective layer above the slag pool 210, so that the oxidation of air is avoided again; the final oxygen content in ingot 230 may be stabilized below 0.002%.

The second fusible blowing pipe 322 is an industrial pure iron argon blowing pipe, and pure iron componentsC is less than or equal to 0.05 percent, Al is 0.02-0.04 percent, P, S is less than or equal to 0.008 percent, Fe is more than or equal to 99.8 percent, the melting point of the industrial pure iron is slightly high, the distance from the second melting end 342 to the upper surface of the slag pool 210 is h2, the distance from the second melting end 342 to the upper surface of the slag pool 210 is less than or equal to 2cm, h2 is less than or equal to 3cm, the wall thickness is 1-2mm, the inner diameter is 10-20mm, the bottom end of the second fusible blowing pipe 322 can be melted after entering the lower part of the upper surface of the slag pool 210 to form the second melting end 342, argon is³And/h, the argon bubbles blown into the slag pool 210 are a vacuum system relative to hydrogen in slag or molten steel, so that the hydrogen in the slag pool 210 and the molten steel is promoted to diffuse into the argon bubbles, the hydrogen content in the steel is reduced as the argon bubbles overflow the slag pool 210, and the hydrogen content in an electroslag ingot can be stably controlled to be below 0.0002%.

In addition, as shown in fig. 4 to 5, the first fusible blowing pipe 321 is bent, an included angle between the axial direction of the first fusible blowing pipe 321 and the horizontal plane is α, α is greater than or equal to 15 degrees and less than or equal to 75 degrees, and the first fusible blowing pipe 321 is bent, so that the first melting end 341 can be obliquely blown, and the argon can more comprehensively cover the upper surface of the whole slag pool 210; and under the condition that a plurality of first fusible blowing pipes 321 are arranged, the included angle between the axial direction of each first fusible blowing pipe 321 and the horizontal plane is the same on the same height, so that the same injection angle of each first fusible blowing pipe 321 at the same time can be ensured, and the argon gas seal of the upper surface of the whole slag pool 210 is further promoted.

The invention has been described above in detail with reference to specific exemplary embodiments. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to illustrate the present state of the art and the meaning of the present development and is not intended to limit the present invention or the present application and the field of application of the present invention.

More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, such as combinations between various embodiments, adapted changes and/or substitutions as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.

Claims

1. The protective gas blowing device is characterized in that a fusible blowing pipe is vertically arranged on the side surface of a consumable electrode (310), the fusible blowing pipe comprises a first fusible blowing pipe (321) and a second fusible blowing pipe (322), the bottom end of the first fusible blowing pipe (321) is fused to form a first fusing end (341), the first fusing end (341) is located above the upper surface of a slag pool (210), the bottom end of the second fusible blowing pipe (322) is fused to form a second fusing end (342), and the second fusing end (342) is located below the upper surface of the slag pool (210).

2. The protective gas blowing device for the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel according to claim 1, wherein the first fusible blowing pipe (321) is a red copper blowing pipe, and the second fusible blowing pipe (322) is a pure iron blowing pipe.

3. The shielding gas blowing device for the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel according to claim 1, wherein the distance from the first melting end (341) to the upper surface of the slag bath (210) is h1, and the h1 satisfies 3 cm. ltoreq. h 1. ltoreq.5 cm.

4. The shielding gas blowing device for the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel according to claim 1, wherein the distance from the second melting end (342) to the upper surface of the slag bath (210) is h2, and the h2 satisfies 2cm & lt h2 & lt 3 cm.

5. The protective gas blowing device for the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel according to claim 1, wherein at least two first fusible blowing pipes (321) are provided, and at least two second fusible blowing pipes (322) are provided.

6. The shielding gas blowing device for the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel according to claim 1, wherein the first fusible blowing pipe (321) is bent.

7. The protective gas blowing device for the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel according to claim 5, wherein the first fusible blowing pipes (321) are uniformly arranged along the circumferential direction of the consumable electrode (310); the second fusible blowing pipes (322) are uniformly arranged in the circumferential direction of the consumable electrode (310).

8. The protective gas blowing device for the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel according to claim 6, wherein an included angle between the axial direction of the first fusible blowing pipe (321) and the horizontal plane is alpha, and the alpha is more than or equal to 15 degrees and less than or equal to 75 degrees.

9. The protective gas blowing device for the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel according to claim 8, wherein the number of the first fusible blowing pipes (321) is multiple, and the included angle between the axial direction of each first fusible blowing pipe (321) and the horizontal plane is the same on the same height.

10. The protective gas blowing device for the electroslag remelting process of 1Cr17Ni2 or 5CrNiMoV steel according to any one of claims 1 to 9, wherein the top end of the first fusible blowing pipe (321) is connected with a gas source through a first vent pipe (331); the top end of the second fusible blowing pipe (322) is connected with an air source through a second vent pipe (332).