CN1710366A - A top-bottom re-blowing vacuum induction furnace - Google Patents

Abstract

A vacuum induction furnace with top blow and bottom blow features setting top oxygen-blowing gun at top centre of small vacuum chamber with one end being connected to small vacuum chamber and another end being connected to gas supply pipe, enabling said gun to be moved vertically for inserting it to liquid steed surface in big vacuum chamber; connecting bottom blow vent-plug top port to crucible and bottom port to gas supply pipe. It has functions of decarbonization and denitrification , as well can be used to smelt low carbon steel and low nitrogen steel or to simulate VOD furnace for developing new technology .

Description

A top-bottom re-blowing vacuum induction furnace

technical field

The invention relates to the technical field of metallurgical equipment, in particular to a vacuum induction furnace for iron and steel smelting.

Background technique

Vacuum induction furnaces commonly used at present do not have top blowing system and bottom blowing gas supply system, and it cannot blow oxygen and inert gas into molten steel. Therefore, the steel grades made by traditional vacuum induction furnaces only depend on raw materials and raw material conditions. The quality of the furnace directly affects the quality of the product, and it is difficult to adjust it in the furnace. The smelted steel generally contains high carbon, nitrogen and non-metallic inclusions, especially the smelting of ultra-low carbon steel and ultra-low nitrogen steel is very difficult or even impossible. Due to the above shortcomings of the traditional vacuum induction furnace, it cannot meet the needs of smelting high-purity steel.

Contents of the invention

Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a multi-functional and multi-purpose top-bottom blowing vacuum induction furnace.

The vacuum induction furnace of the present invention has the functions of a general vacuum induction furnace. The vacuum furnace is provided with a large vacuum chamber and a small vacuum chamber from bottom to top. The large vacuum chamber communicates with the air inlet of the vacuum unit; the large vacuum chamber is provided with The crucible is equipped with an induction coil on the outer wall of the crucible, and the induction coil is connected with an intermediate frequency power supply to realize induction heating of the furnace material in the crucible; a diversion groove is provided on the outside of the crucible to export the melted steel; in order to overcome the existing vacuum induction furnace Defects in function and use, the top-bottom double-blowing vacuum induction furnace of the present invention is equipped with a top-blowing oxygen lance, and a bottom-blowing air supply element, that is, a bottom-blowing air plug. The top-blown oxygen lance is set at the top center of the small vacuum chamber, one end is connected with the small vacuum chamber, and the other end is connected with the gas supply pipeline. The top-blown oxygen lance can move vertically. When the molten steel is supplied with oxygen, under the condition of not destroying the vacuum of the large vacuum chamber, insert the top-blown oxygen lance into the vacuum chamber to the surface of the molten steel in the vacuum furnace to supply oxygen to the molten steel through the small vacuum chamber and the connecting mechanism. The oxygen flow range is adjustable. The bottom blowing gas supply element is directly installed on the bottom of the induction furnace through the bottom blowing block, and passes through the bottom center of the crucible. The upper port is connected with the molten steel in the crucible, and the lower port is connected with the gas supply pipeline; , the gas supply valve can be opened at any time to blow and supply gas to the bottom of the molten steel in the crucible. When the melting stage or when there is no need to supply gas to the furnace, the gas shut-off valve can be closed, and the venting plug will not be filled with steel or blocked, and can be adjusted freely. Therefore, the equipment has the functions of vacuum heating and melting molten steel, top blowing oxygen, and bottom blowing inert gas.

Oxygen can be blown into the furnace from the top due to the top blowing oxygen lance, so the equipment has a decarburization function, which can remove the carbon in the steel to a very low level, and can smelt ultra-low carbon steel.

Due to the bottom blowing gas supply element, that is, the bottom blowing vent plug, inert gases such as argon and nitrogen can be introduced into the molten steel, which can reduce the content of harmful impurities in the steel to a very low level and can smelt ultra-pure steel.

The equipment has the function of filling gas, such as nitrogen filling. Filling nitrogen into the vacuum chamber of the induction furnace can make the nitrogen content in the steel greater than that in the atmosphere, so high nitrogen steel can be smelted.

The vacuum induction furnace of the invention can smelt high-purity steel, especially ultra-low carbon stainless steel and ultra-low nitrogen stainless steel. In addition to being suitable for some enterprises to smelt alloy steel, stainless steel and some special high-temperature alloys with low carbon and nitrogen content, it is especially suitable for major iron and steel smelting enterprises, technology centers, and scientific research institutes to develop new varieties and simulate the needs of VOD to develop new processes.

Description of drawings

Fig. 1 is the front view of the structure diagram of the vacuum induction furnace with top and bottom double blowing in the present invention.

Fig. 2 is a left view of the structure diagram of the vacuum induction furnace with combined top and bottom blowing of the present invention.

Fig. 3 is a top view of the structure of the vacuum induction furnace with combined top and bottom blowing of the present invention.

Figure 1, Figure 2, and Figure 3 include 1 electrode shaft, 2 induction coils, 3 observation windows, 4 stamping rods, 5 top oxygen blowing lances, 6 bottom blowing vent plugs, 7 alloy hoppers, 8 crucible caps, and 9 furnaces Cover lifting mechanism, 10 vacuum unit, 11 crucible, 12 diversion tank, 13 temperature measuring mechanism, 14 ingot mold chamber, 15 breakout channel, 16 intermediate frequency power supply.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, the top-bottom combined blowing vacuum induction furnace includes an electrode shaft 1, an induction coil 2, an observation window 3, a stamping rod 4, a top blowing oxygen lance 5, a bottom blowing vent plug 6, Alloy feeding hopper 7, crucible cap 8, furnace lid lifting mechanism 9, vacuum unit 10, crucible 11, diversion groove 12, temperature measuring mechanism 13, ingot mold chamber 14, breakout groove 15, intermediate frequency power supply 16. A large vacuum chamber and a small vacuum chamber are sequentially arranged from bottom to top, and the large vacuum chamber communicates with the air inlet of the vacuum unit 10; a crucible 11 is arranged in the large vacuum chamber, a crucible cap 8 is arranged on the crucible, and a diversion groove 12 is arranged on the outside of the crucible. It is used to derive the smelted molten steel; an induction coil 2 is set on the outer wall of the crucible, and the induction coil 2 is connected to the intermediate frequency power supply 16 to realize induction heating of the molten steel in the furnace; one end of the electrode shaft 1 is connected to the water-cooled copper bar of the intermediate frequency power supply, and the other end It is connected with the induction coil 2; the top-blown oxygen lance 5 is arranged at the top center position of the small vacuum chamber, one end communicates with the small vacuum chamber, and the other end is connected with the gas supply pipeline. The top-blown oxygen lance can move vertically, when needed When oxygen is blown from the top of the molten steel in the furnace, the top-blown oxygen lance 2 can be inserted into the large vacuum chamber to the surface of the molten steel to blow oxygen into the molten steel through the small vacuum chamber and the connecting machine; Through the center of the bottom of the crucible 11, the upper port is connected with the molten steel in the crucible, and the lower port is connected with the gas supply pipeline. Or when there is no need to supply gas to the furnace, the gas shut-off valve can be closed, and the vent plug will not be filled with steel or blocked; a steel leakage groove 15 is set at the bottom of the large vacuum chamber, and an ingot mold chamber 14 is set at the outlet of the molten steel; in addition, the equipment Vertically fix the furnace cover lifting mechanism 9 on the outer wall of the furnace, and set alloy feeding hopper 7, stamping rod 4, observation window 3, temperature measuring mechanism 13 and other parts on the top of the small vacuum chamber.

Claims (2)

1, a kind of top-bottom reblowing vacuum inductive stove, comprise the electrode rotating shaft, induction coil, observation window, smash the material bar, top blow oxygen lance, the bottom blowing porous plug, the material alloying bucket, the crucible cap, furnace cover lifting mechanism, the vacuum unit, crucible, guiding gutter, temperature measuring mechanism, the ingot mould chamber, the bleed-out groove, intermediate frequency power supply, set gradually big vacuum chamber and little vacuum chamber from the bottom to top, it is characterized in that being provided with top blow oxygen lance and bottom blowing porous plug, top blow oxygen lance is arranged on the top center position of little vacuum chamber, one end and little vacuum chamber, the other end is connected with gas supply line, the bottom blowing porous plug is installed on the furnace bottom of induction furnace, pass the crucible bottom center, upper port and crucible internal communication, lower port links to each other with gas supply line.

2, the application of top-bottom reblowing vacuum inductive stove as claimed in claim 1 is characterized in that utilizing the top blow oxygen lance of this induction furnace to the oxygen supply of molten steel top blast; Utilize the bottom blowing porous plug bottom blowing stirring of inert gas molten bath of this induction furnace; Inflated with nitrogen in the vacuum chamber of this induction furnace, smelting high-nitrogen steel.

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