Technological process for removing small inclusions in secondary refining

A process method and out-of-furnace refining technology, applied in the direction of improving process efficiency, can solve problems such as inability to control small inclusions, and achieve the effect of 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 small inclusions in secondary refining
  • Technological process for removing small inclusions in secondary refining

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Transport the converter tapping to the LF station, measure the temperature and take samples, and adjust the composition; when the alloying is completed, stop blowing argon, and feed the cored wire, the line speed is 200-350m / min, and the wire feeding amount is 100-800m / t ;After feeding the line, stand still for 1-3 minutes, and then blow argon for light treatment. The casting adopts full protection pouring.

[0033] For the preparation of the cored wire, first, the low-melting point pre-melted slag is prepared by taking 40kg of CaO powder, Al 2 o 3 Powder 35kg, SiO 2 Powder 10kg, MgO powder 10kg, CaF 2 Put 5kg of powder into a mixer for uniform mixing, then melt and cool in a magnesia crucible, and then grind it into a powder with a particle size of 1nm to 3.5mm through crushing, rolling and airflow micro-powder milling, with a melting point of 1100~ Standby at 1550°C; then take 35kg of low-melting pre-melted slag powder, 5kg of calcium fluoride powder, 55kg of calc...

Embodiment 2

[0035]Transport the steel from the converter to the RH station, measure the temperature and take samples, adjust the composition, and clean the cycle. When the alloying is finished, feed the cored wire, and the wire feeding position is selected on the side of the RH downcomer. The feeding line speed is 180-350m / min, and the feeding amount is 50-800m / t. After feeding the line, the RH cycle time is 3 to 10 minutes, breaking the air, moving out, casting on the machine, and the continuous casting adopts the whole process of protective pouring.

[0036] For the preparation of cored wire, first take CaO10kg, Al 2 o 3 50kg, SiO 2 5kg, MgO5kg, CaF 2 30kg prepares low-melting point pre-melting slag, its method is the same as embodiment 1; Get its particle diameter again according to formula ratio and be that the prepared low-melting point pre-melting slag 1kg of 1nm~3.5mm, magnesium oxide 98kg, magnesium carbonate 1kg enter stand Mix the materials uniformly in a type mixer for 1-8...

Embodiment 3

[0038] Transport the steel from the converter to the CAS-OB station, measure the temperature and take samples, and adjust the composition. After the alloying is finished, feed the cored wire, the wire feeding speed is 200-350m / min, the feeding amount is 50-800m / t, and the bottom blowing argon gas is stirred after feeding the wire, and the argon gas stirring intensity is 0-0.004m 3 / (min t). Argon blowing time is 1-10min. Moved out, poured on the machine, continuous casting adopts full protection pouring.

[0039] For the preparation of cored wire, first take CaO70kg, Al 2 o 3 15kg, SiO 2 3kg, MgO2kg, CaF 2 10kg prepares low-melting point pre-melted slag, its method is the same as embodiment 1; Get its particle diameter again and be the mixture 30kg ( The proportioning of the two is not strictly required), 10kg of the mixture of calcium oxide and magnesium oxide, and 15kg of bentonite are put into a vertical mixer for uniform mixing for 1 to 8 hours, wherein the activity ...

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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 by the external refining technology. The technology of the invention comprises the steps as follows: a. molten steel is refined at LF, RH, VD or CAS-OB work position; b. a wire feeding technology is adopted to feed cored wires into the molten steel at the work positions; c. the molten steel is then directly cast on a machine after the wire feeding and the continuous casting adopts a whole-process protection casting. As the added cored wires have a scientific and reasonable prescription, when micro-air bubbles occur in the molten steel, the bubbles have high collision probability with the slag inclusions and fine slag drops have the function of wash heat and can also effectively remove the slag inclusions in the molten steel. The technology of the invention can control the size and the quantity of the non-metallic inclusions in steel and the total oxygen amount can be controlled to be 3ppm to 14ppm, the equivalent diameter of the impurities to be 0.5 micron to 9 micro 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 an out-of-furnace refining process for various microalloy steels and special steels, in particular to a process for removing fine inclusions through out-of-furnace refining, which is the first choice for refining various microalloy steels or special steels to remove fine inclusions 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 use of steel and the harsh conditions of use, the requirements for inclusions in steel are more stringent. [0003] The harm of inclusions to steel is mainly related to the quantity and size of inclusions. To control the quality of inclusions, the most important thing is to control the quantity and size of inclusions. Due to different steel types and sm...

Claims

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Application Information

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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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