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Bottom-blowing medium-frequency smelting furnace and in-furnace auxiliary refining method

A melting furnace and bottom blowing technology, applied in the field of induction melting furnaces, can solve the problems of lack of metallurgical reaction conditions and reaction time, affecting the surface quality and internal quality of precision castings, unable to meet the quality requirements of important precision castings, etc. Simple structure, avoid violent boiling and splashing, easy to make effects

Inactive Publication Date: 2007-11-07
TAIZHOU JINDING PRECISION CASTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The intermediate frequency melting furnaces in the prior art, especially the intermediate frequency melting furnaces with a capacity of less than 250kg, are not equipped with an auxiliary refining structure in the furnace, and the molten steel is directly used for casting. Since the molten steel lacks sufficient metallurgical reaction conditions and reaction time, the molten steel The quality cannot meet the quality requirements of important precision castings, directly affecting the surface quality and intrinsic quality of precision castings

Method used

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  • Bottom-blowing medium-frequency smelting furnace and in-furnace auxiliary refining method

Examples

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Effect test

Embodiment 1

[0018] The bottom-blown intermediate frequency melting furnace shown in the accompanying drawing includes two parts, the furnace body and the gas supply system. The furnace body includes a furnace lining 1 and a cover plate 2 set on the outer periphery of the furnace lining 1, an upper frame brick 3, an induction coil 4, insulating fibers 5, and a shell 6. The bottom plane of the furnace lining 1 is supported on the base 7 plane. The bottom of the furnace lining 1 and the middle part of the base 7 are all through holes, and the through holes on the bottom of the furnace lining 1 are filled with breathable bricks 9, and the gas pipe joint 8 is sealed and connected with the metal bellows 10 to introduce the gas supply system to the furnace body. The gas supply system is composed of a gas source connecting pipe 14 , a gas regulator 13 , a flow meter 12 , a gas delivery hose 11 , a metal bellows 12 and a gas delivery pipe joint 8 which are sequentially connected in series. The gas...

Embodiment 2

[0023] This embodiment is applied to a bottom-blown intermediate frequency smelting furnace with a capacity of 150kg. The structure of the furnace body and the gas supply system are the same as those in Embodiment 1. The metal charge loaded is 304 stainless steel, the charge weighs 150kg, and the bottom of the furnace lining 1 is fitted. The diameter of the small end face of the air-permeable brick 9 is φ100mm, and the thickness is 100mm. First melt the metal charge according to the normal smelting method, and then carry out auxiliary refining in the furnace after the metal charge is completely melted. The specific method is:

[0024] A. The gas source is connected through the gas source connecting pipe 14, and the gas source used in this embodiment is still argon;

[0025] B. Adjust the regulating valve 16 on the gas regulator 13 according to the working conditions. The pressure value of the argon gas delivered to the permeable brick 9 is 0.4-0.6MPa, and the flow rate is betw...

Embodiment 3

[0028] This embodiment is applied to a bottom-blown intermediate frequency smelting furnace with a capacity of 100kg. The structure of the furnace body and the gas supply system are the same as those in Embodiment 1. The metal charge loaded is 304 stainless steel, and the charge weighs 100kg. The diameter of the small end face of the air-permeable brick 9 is φ75mm, and the thickness is 70mm. First melt the metal charge according to the normal smelting method, and then carry out auxiliary refining in the furnace after the metal charge is completely melted. The specific method is:

[0029] A. The gas source is connected through the gas source connecting pipe 14, and the gas source used in this embodiment is still argon;

[0030] B. Adjust the regulating valve 16 on the gas regulator 13 according to the working conditions. The pressure value of the argon gas delivered to the permeable brick 9 is 0.3-0.5MPa, and the flow rate is between 200-300l / s, which can meet the requirements ...

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Abstract

The present invention discloses one kind of bottom blown MF smelting furnace, which has a furnace body comprising furnace lining, porous brick, cover plate, induction coil, shell and other parts; and a gas supply system comprising pipe, gas regulator, flowmeter, pressure meter, regulating valve and other parts. The gas supply system is connected to the furnace body through corrugated metal pipe and union. The present invention also discloses the auxiliary refining process in the bottom blown MF smelting furnace, and the process includes introducing inert gas after all the charges inside the furnace are molten to the porous brick in the pressure of 0.1-1.0 MPa and flow rate of 100-700 1 / s, and auxiliary refining for 3-5 min. The present invention is especially suitable for use in MF smelting furnace of capacity less than 250 kg, and has simple furnace structure, good permeating property, good auxiliary refining effect and other advantages.

Description

technical field [0001] The invention relates to an induction melting furnace for metal smelting, in particular to an intermediate frequency melting furnace. The invention also relates to a method for assisting refining of molten steel by blowing inert gas from the bottom of an intermediate frequency melting furnace. Background technique [0002] Metal smelting is a very complicated production process. In order to improve the quality of metal smelting, a device for introducing oxygen or related inert gases into the furnace is installed at the bottom or side of the large steelmaking furnace. When blowing molten steel, the gas mixed with molten steel will form bubbles to float up until they are discharged. During the floating process, the bubbles will stir and absorb impurities and harmful gases in molten steel. The purpose of molten steel assisted refining. Investment precision casting enterprises are also small-scale steelmaking enterprises, and most of the steelmaking furn...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C7/072
Inventor 荆剑钟雪友
Owner TAIZHOU JINDING PRECISION CASTING
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