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Method for treating molten steel calcium, composite calcium line and method for manufacturing steel

A calcium treatment and molten steel technology, applied in the field of iron and steel metallurgy, can solve problems such as molten steel overflowing easily, hidden dangers in steel quality, large fluctuations in calcium yield, etc., to prolong residence time, weaken splash intensity, and expose areas small effect

Inactive Publication Date: 2013-07-10
PANGANG GROUP CHENGDU STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the existing solid-core pure calcium wire can increase the calcium yield to a certain extent, but because it does not consider the effect of bottom blowing argon on the calcium treatment effect of molten steel, the calcium yield fluctuates greatly. The molten steel splashes strongly, and the molten steel is easy to spill out of the bag, which also poses a threat to the safety of personnel, and there is a large potential safety hazard
At the same time, the splash strongly causes the molten steel to absorb air, and there are also hidden dangers in the quality of the steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] A 50-ton converter is used to produce the molten steel calcium treatment process and steel production method according to the present invention, and the process steps are as follows: the molten steel is initially smelted in the converter. During the tapping process, deoxidizer is added to the ladle for pre-deoxidation, and bottom blowing argon is used to stir. Then lift the ladle filled with molten steel to the refining station of the LF furnace for refining. After the LF furnace is refined, the molten steel is fed with a composite pure calcium cored wire for calcium treatment. At this time, the intensity of the bottom blowing argon is controlled to 1.0L / min·t steel, and the feeding point of the calcium wire is determined to be at a distance from the molten steel. At 250mm from the edge of the bare area on the surface, the line feeding speed is 100m / min. After calcium treatment, blow argon softly for 11 minutes, and then carry out continuous casting. Among them, the c...

example 2

[0033] A 70-ton electric furnace is used to produce molten steel calcium treatment process and steel production method according to the present invention, and the process steps are as follows: molten steel is initially smelted in a converter. During the tapping process, deoxidizer is added to the ladle for pre-deoxidation, and bottom blowing argon is used to stir. Then lift the ladle filled with molten steel to the refining station of the LF furnace for refining. After refining in the LF furnace, the molten steel is treated with pure calcium cored wire for calcium treatment, the strength of the bottom blowing argon is controlled to 1.8L / min·t steel, and the feeding point of the calcium wire is determined to be 300mm from the edge of the exposed area on the molten steel surface , the feeding speed is 110m / min. After calcium treatment, blow argon softly for 10 minutes, and then carry out continuous casting. Among them, the outermost layer of the calcium wire used in this examp...

example 3

[0036] A 100-ton converter is used to produce the molten steel calcium treatment process and steel manufacturing method according to the present invention, and the process steps are as follows: the molten steel is initially smelted in the converter. During the tapping process, deoxidizer is added to the ladle for pre-deoxidation, and bottom blowing argon is used to stir. Then lift the ladle filled with molten steel to the refining station of the LF furnace for refining. After refining in the LF furnace, the molten steel is treated with silicon-calcium wire. The intensity of bottom blowing argon is controlled at 1.5L / min·t steel. The feeding point of the silicon-calcium wire is determined to be 350mm from the edge of the exposed area on the liquid steel surface. , Feeding line speed is 120m / min. After calcium treatment, blow argon softly for 12 minutes, and then carry out continuous casting. Among them, the outermost layer of the silicon-calcium wire used in this example is i...

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Abstract

The invention provides a method for treating molten steel calcium, a composite calcium line and a method for manufacturing steel. The method for treating molten steel calcium comprises the following steps of: performing calcium treatment to molten steel in a mode of feeding a calcium line to the molten steel; and controlling the feeding position of the calcium on the position which is 200 to 350mm from the edge of the exposed region on the molten steel surface. The composite calcium line comprises an inner pure calcium line, an outer steel casing and ferrosilicon powder filled between the inner layer and the outer layer. The method for manufacturing steel comprises the following steps of: primarily melting molten steel, pre-deoxidizing, refining molten steel by LF (ladle furnace) and performing calcium treatment, wherein the step of calcium treatment is to perform calcium treatment on the molten steel by adopting the molten steel calcium treatment method. In the steel making process, calcium can be quickly brought to the deep part of molten steel by using the method, so that the staying time of calcium in molten steel can be prolonged, the effect of calcium treatment can be reinforced, the molten steel splashing strength can be weakened, and steel with better quality can be obtained finally.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, and more specifically, relates to a molten steel calcium treatment technology, a composite calcium wire and a steel manufacturing method. Background technique [0002] Calcium treatment of molten steel, that is, the residual high melting point Al in molten steel 2 o 3 The inclusions are denatured to form calcium-aluminate with a low melting point, so as to improve the casting performance of molten steel. Specifically, the calcium wire can be fed into the molten steel through the wire feeder, and the bottom blowing argon is used to stir to promote the metallurgical reaction, and the Al 2 o 3 The brittle inclusions become low-melting calcium-aluminate spherical inclusions, which can effectively promote the floating of inclusions, improve the cleanliness of molten steel, reduce the blockage of the tundish nozzle, and create conditions for continuous casting to achieve low superh...

Claims

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Application Information

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IPC IPC(8): C21C7/04
Inventor 王海兵黄生权苏雄杰冯文全
Owner PANGANG GROUP CHENGDU STEEL & VANADIUM
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