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Technological process for removing fine occluded foreignsubstance in molten steel

A process method and inclusion technology, which is applied in the field of removing fine inclusions in molten steel, can solve problems such as inability to control fine inclusions, and achieve high collision probability and scientific and reasonable preparation

Active Publication Date: 2008-12-17
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above method can remove inclusions to a certain extent, it cannot effectively control fine inclusions.

Method used

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  • Technological process for removing fine occluded foreignsubstance in molten steel
  • Technological process for removing fine occluded foreignsubstance in molten steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Adjust the position of the RH downcomer and the lowering pipe so that they are on the opposite side of the lowering pipe. The ladle is transported to the RH station, and the temperature is measured and sampled. The actual temperature of the molten steel in the refining process is 5-25℃ higher than the temperature required for general refining, vacuuming, adjusting the composition, and net circulation. When the vacuum of the RH vacuum chamber is 66.7~500Pa, put the composite spheres from the RH alloy silo, the diameter of the composite spheres is 10~60mm, the addition amount of the composite spheres is 0.5~3.5kg / t, and the single addition amount is 50~ 130kg, the interval between the two additions is 0-5min, and the composite sphere is put into the cycle for 0.1-15min; then it is removed and poured on the machine, and the continuous casting adopts the whole process of protective pouring.

[0030] For the preparation of composite spheres, first, the low melting point pre-melt...

Embodiment 2

[0032] Adjust the position of the RH downcomer and the lowering pipe so that they are on the opposite side of the lowering pipe. The ladle is transported to the RH station, and the temperature is measured and sampled. The actual temperature of the molten steel in the refining process is 5-25℃ higher than the temperature required for general refining, vacuuming, adjusting the composition, and net circulation. When the vacuum of the RH vacuum chamber is 66.7~500Pa, put the composite spheres from the RH alloy silo, the diameter of the composite spheres is 10~60mm, the addition amount of the composite spheres is 0.5~3.5kg / t, and the single addition amount is 50~ 130kg, the interval between the two additions is 0-5min, and the composite sphere is put into the cycle for 0.1-15min; then it is removed and poured on the machine, and the continuous casting adopts the whole process of protective pouring.

[0033] For the preparation of composite spheres, first take CaO10kg, Al according to t...

Embodiment 3

[0035] Adjust the position of the RH downcomer and the lowering pipe so that they are on the opposite side of the lowering pipe. The ladle is transported to the RH station, and the temperature is measured and sampled. The actual temperature of the molten steel in the refining process is 5-25℃ higher than the temperature required for general refining, vacuuming, adjusting the composition, and net circulation. When the vacuum of the RH vacuum chamber is 66.7~500Pa, put the composite spheres from the RH alloy silo, the diameter of the composite spheres is 10~60mm, the addition amount of the composite spheres is 0.5~3.5kg / t, and the single addition amount is 50~ 130kg, the interval between the two additions is 0-5min, and the composite sphere is put into the cycle for 0.1-15min; then it is removed and poured on the machine, and the continuous casting adopts the whole process of protective pouring.

[0036] For the preparation of composite spheres, first take CaO70kg, Al according to t...

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Abstract

The invention relates to an external refining technology of various micro-alloy steels and special steels, in particular to a technology for removing slag inclusions in molten steel. The technology of the invention comprises the steps as follows: a. the adjustment of an RH work position: the positions of a down pipe and a feed pipe of the RH are adjusted to ensure that the down pipe is positioned at the opposite side of the feed pipe; b. refining: after being transported to the RH work position, ladles are done with temperature measurement, sampling, vacuumizing, ingredient adjustment and clean circulation; c. input of compound spheres: after the refining, the compound spheres are put into the molten steel at the work position; d. continuous casting: after the compound spheres are put into the molten steel, the molten steel is then directly cast on a machine and the continuous casting adopts a whole-process protection casting. The technology of the invention can control the size and the quantity of the non-metallic inclusions in steel and the total oxygen amount to be 3ppm to 14ppm, the equivalent diameter of the impurities to be 0.5micron to 9micro and the average area of the impurities to be 0.002 percent to 0.008 percent, thus greatly improving the clearity of the molten steel and reducing the smelting cost.

Description

Technical field [0001] The invention relates to a furnace refining process of various microalloy steels and special steels, in particular to a process method for removing small inclusions in molten steel. It is a secondary refining of various microalloy steels or special steels to remove small inclusions The preferred process method. Background technique [0002] In recent years, due to the progress of ladle refining technology and continuous casting technology, the content of oxide-based non-metallic inclusions has been reduced, so that molten steel with excellent cleanliness can be produced. However, due to the harsh use and use conditions of steel, the requirements for inclusions in steel are more stringent. [0003] The hazards of inclusions to steel are mainly related to the number and size of inclusions. For quality control of inclusions, the first thing is to control the number and size of inclusions. Due to different steel grades and smelting cost constraints, the require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/04C21C7/076
CPCY02P10/20
Inventor 唐复平王晓峰刘万山孟劲松任子平李德刚陈本文王仁贵张军王文仲李镇张晓军孙群栗红
Owner ANGANG STEEL CO LTD
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