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Refining method for purifying and homogenizing molten steel through high-frequency vibration

A high-frequency vibration and homogenization technology, applied in the field of steel water refining, can solve problems such as large gas consumption, easy safety problems, and cooling, and achieve the effects of low operating cost, excellent effect and simple operation.

Pending Publication Date: 2019-04-05
刘玉满
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former eliminates the gas and impurities dissolved in the molten steel through the action of some elements in the "refining agent". It has a certain purification effect, but the cost is high, the stirring operation is difficult, and the refining agent is varied, which affects the composition of molten steel. And the molten steel is seriously cooled in the ladle
The effect of the latter is not very obvious, and the device for introducing argon gas is complicated and prone to safety problems, the gas consumption is large, and the operation is not safe and reliable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] ZG270-500 molten steel vibration and vibration test

[0014] 1. The motor power of the high-frequency vibration table used is 5kw, the amplitude is 0.8mm, the frequency is 130Hz, the molten steel in the ladle is 3360kg, and the vibration time is 120 seconds;

[0015] 2. Intuitive phenomenon during vibration - many tiny steel flowers on the surface of molten steel flicker frequently (gas overflow), and trace inclusions emerge from the liquid surface;

[0016] 3. Pouring castings (5 boxes, 15 pieces per box, 41kg each), 75 pieces have no porosity defects in appearance and after processing, good machining and cutting performance, fine crystallization, yield strength 290MPa, tensile strength 553MPa;

[0017] 4. The molten steel in the same furnace has not been refined by high-frequency vibration. The molten steel in the ladle is 346kg. After leaving the furnace for 2 minutes, 75 castings of the same type are poured. After quality inspection and comparison:

[0018] There a...

Embodiment 2

[0020] Vibration and loss test of HT250 molten iron

[0021] 1. The technical index of the vibrating table is the same as that of the previous ZG270-500 test, the ladle contains 3116kg of molten iron, and the vibration time is 120 seconds;

[0022] 2. Pouring 5 boxes, 21 pieces in each box, 106 pieces in total, weighing 26kg;

[0023] 3. Casting quality inspection: 2 pore defects; tensile strength 270MPa; graphite shape: A type fine;

[0024] 4. 310kg of HT250 molten iron smelted in the same furnace, without high-frequency vibration treatment, poured 106 similar castings after standing in the ladle for 2 minutes, quality inspection results: 16 pore defects; tensile strength 248MPa; graphite form: Type A+ Type D.

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Abstract

The invention discloses a refining method for purifying and homogenizing molten steel through high-frequency vibration. After the molten steel is injected into a steel ladle, the steel ladle is placedon a high-frequency vibration table, the vibration amplitude is adjusted to be 0.5-1.0 mm, the frequency ranges from 100 Hz to 200 Hz, vibration is conducted for 60-150 seconds, gas is enabled to escape, impurities float, and parts are cast after purifying and homogenizing. The refining method has the advantages that the molten steel purifying and homogenizing method is easy to operate, safe, reliable and rapid; refining equipment is low in cost, investment is low, the operation cost is low, power required by 5 tons of molten steel of a vibration motor of the high-frequency vibration table is5 kilowatts, the vibration table is started for 120 seconds, and power consumption is 0.17 kilowatt, so that the refining cost is 0.1 yuan equivalently; and the molten steel purifying and homogenizing effect are excellent, and castings with high quality can be cast.

Description

technical field [0001] The invention relates to refining of molten steel, in particular to a refining method for purifying and homogenizing molten steel through high-frequency vibration. Background technique [0002] There are about 50,000 foundries in my country, most of which do not pay attention to or implement the purification and refining of molten steel, but pour it immediately after melting in the furnace. Therefore, in the case of no difference in chemical composition, the performance and service life of castings vary greatly. Only a very small number of foundries in the country implement degassing and impurity removal in the ladle before the molten steel furnace. The traditional and current methods are to add "refining agent" to the ladle when tapping, or to pass argon gas from the bottom of the ladle. The former eliminates the gas and impurities dissolved in the molten steel through the action of some elements in the "refining agent". It has a certain purification...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00B22D1/00
CPCB22D1/00C21C7/00
Inventor 刘玉满刘翔肖武刚张玉芳罗通
Owner 刘玉满
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