Steel ladle bottom argon blowing refining method

A bottom-blowing argon and ladle technology, applied in casting melt containers, manufacturing tools, metal processing equipment, etc., can solve the problem of large gas flow rate of slit-type breathable bricks, affecting the effect of argon blowing, stirring and mixing, and affecting the removal of argon bubbles. It can improve the removal rate of inclusions, improve the mixing effect, and shorten the refining time of argon blowing in the whole process.

Pending Publication Date: 2019-05-17
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic refining ladles of more than 100 tons generally adopt the method of blowing argon at the same flow rate of two bottom-blown air bricks. The two air bricks generally use slit-type air bricks. In actual production, there are the following problems or deficiencies: (1) The same flow rate The two streams interfere with each other during the argon blowing process, offset the energy, and affect the mixing effect of the argon blowing and stirring, and the mixing takes a long time; Stirring function is required, but the aperture of t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this invention, a slit type air-permeable brick A and a diffuse air-permeable brick B are arranged on an arc with the center of the ladle bottom as the center and a radius of r. The argon blowing control is divided into two stages:

[0020] 1) During the argon blowing, stirring and mixing stage, the argon blowing flow control requirements: the argon blowing flow of the slit type venting brick A is 800NL / min, and the argon blowing flow of the dispersing venting brick B is 400NL / min;

[0021] 2) Inclusion removal stage by soft blowing: argon blowing flow control requirements: the argon blowing flow of slit type venting brick A is 200NL / min, and the argon blowing flow of dispersing venting brick B is 200NL / min.

[0022] The arc radius r=0.66R, where R is the radius of the bottom circle of the ladle.

[0023] The included angle α between the slit type ventilation brick A and the arc radius of the nozzle is 90°, and the included angle β between the slit type ventilation brick A an...

Embodiment 2

[0026] The ladle bottom argon blowing refining method as described in Example 1, the difference is:

[0027] In this invention, a slit type air-permeable brick A and a diffuse air-permeable brick B are arranged on an arc with the center of the ladle bottom as the center and a radius of r. The argon blowing control is divided into two stages:

[0028] 1) During the argon blowing, stirring and mixing stage, the argon blowing flow control requirements: the argon blowing flow of the slit type venting brick A is 1200NL / min, and the argon blowing flow of the dispersing venting brick B is 100NL / min;

[0029] 2) Inclusion removal stage by soft blowing: argon blowing flow control requirements: the argon blowing flow of slit type venting brick A is 100NL / min, and the argon blowing flow of dispersing venting brick B is 100NL / min.

[0030] The arc radius r=0.60R, where R is the radius of the bottom circle of the ladle.

[0031] The included angle α between the slit type ventilation brick A and the ...

Embodiment 3

[0033] The ladle bottom argon blowing refining method as described in Example 1, the differences are:

[0034] In this invention, a slit type air-permeable brick A and a diffuse air-permeable brick B are arranged on an arc with the center of the ladle bottom as the center and a radius of r. The argon blowing control is divided into two stages:

[0035] 1) During the argon blowing, stirring and mixing stage, the argon blowing flow control requirements: the argon blowing flow of the slit type venting brick A is 1000NL / min, and the argon blowing flow of the dispersing venting brick B is 200NL / min;

[0036] 2) Inclusion removal stage by soft blowing: argon blowing flow control requirements: the argon blowing flow of slit type venting brick A is 150NL / min, and the argon blowing flow of dispersing venting brick B is 150NL / min.

[0037] The arc radius r=0.64R, where R is the radius of the bottom circle of the ladle.

[0038] The included angle α between the slit type ventilation brick A and th...

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Abstract

The invention relates to a steel ladle bottom argon blowing refining method. A slit type air brick and a diffuse type air brick are arranged at the circumference of the bottom of a steel ladle. The mode that at the argon blowing stirring stage of the steel ladle, large flow argon blowing is conducted on the slit type air brick and small flow argon blowing is conducted on the diffuse type air brickis adopted; one argon blowing flow is large, and the other argon blowing flow is small; and the uniform mixing effect of argon blowing stirring is improved. At the stage of conducting soft blowing for removing occluded foreign substances, the mode that the small flow argon blowing is conducted on the slit type air brick and the diffuse type air brick is adopted; the occluded foreign substance removal rate is increased; and the whole argon blowing refining time is shortened.

Description

Technical field [0001] The invention relates to a refining method by blowing argon at the bottom of a ladle, and belongs to the technical field of steelmaking in steel metallurgy. Background technique [0002] Argon blowing at the bottom of the ladle is a commonly used technique for refining outside the furnace, which can be roughly divided into two stages: large flow argon blowing, stirring and mixing, and small flow soft blowing to remove inclusions. At present, the domestic refined ladle of more than 100 tons generally uses two bottom-blown venting bricks to blow argon at the same flow rate. The two venting bricks generally use slit-type venting bricks. The following problems or shortcomings exist in actual production: (1) The same flow rate During the argon blowing process, the two streams interfere with each other, offset the energy, and affect the mixing effect of argon blowing and stirring, and it takes a long time to mix; (2) The slit type ventilating brick has a large ga...

Claims

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Application Information

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IPC IPC(8): C21C7/072B22D41/58
Inventor 武光君郑春玉
Owner SHANDONG IRON & STEEL CO LTD
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