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Composite sphere for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method

A technology of out-of-furnace refining and inclusions is applied in the field of composite spheres, out-of-furnace refining and desulfurization, and composite spheres for removing fine inclusions. simple craftsmanship

Active Publication Date: 2008-12-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Composite sphere for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method
  • Composite sphere for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The low melting point pre-melted slag takes 40kg of CaO powder and 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, then crush and roll and grind with an airflow micropowder mill to prepare a powder of 1nm to 3.5mm, with a melting point of 1100 to 1550°C for use ; Then according to the formula ratio, take 35kg of low melting point pre-melted slag powder, 30kg of calcium fluoride powder, 20kg of calcium carbonate powder, and 15kg of clay with a particle size of 1nm to 3.5mm into the vertical mixer to fully stir and mix, The mixing time is 1h-3h, and the above-mentioned mixed raw materials are then dried in the drying equipment at a drying temperature of 80-110°C for 2-6h. The raw materials after the above-mentioned drying treatment are made into ball cores on a disc pelletizer by rolling method. The rotating speed of the disc pelletizer is 400-1600r / min. 20mm....

Embodiment 2

[0030] Take CaO10kg and Al according to the formula ratio 2 o 3 50kg, SiO 2 5kg, MgO 5kg, CaF 230kg prepares low-melting point pre-melted slag, its method is the same as embodiment 1; Get its particle diameter respectively according to formula ratio and be the prepared low-melting point pre-melted slag 1kg of 1nm~3.5mm, magnesium carbonate 60kg, calcium fluoride 29kg, Put 10kg of bentonite into a vertical mixer for uniform mixing for 1h-3h, and then dry the above-mentioned mixed raw materials in a drying equipment at a temperature of 90-120°C for 2-5h. The raw materials after the above-mentioned drying treatment are made into ball cores on a disc pelletizer by rolling method. The rotating speed of the disc pelletizer is 400-1600r / min. The control of the ball core size is determined by screening, and its diameter is 1- 20mm. According to the above ratio, take the powder required for the shell and fully mix it in the mixer. The activity of calcium oxide and magnesium oxide i...

Embodiment 3

[0032] Take CaO70kg and Al according to the formula ratio 2 o 3 15kg, SiO 2 3kg, MgO 2kg, 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 35kg ( The ratio of the two is not strictly required), 10kg of calcium fluoride, and 5kg of clay are put into the mixer and fully stirred and mixed. The mixing time is 1h to 3h, and the above-mentioned mixed raw materials are then dried in the drying equipment. , drying temperature is 100 ~ 150 ℃, time is 2 ~ 5h. The raw materials after the above-mentioned drying treatment are made into ball cores on a disc pelletizer by rolling method. The rotating speed of the disc pelletizer is 400-1600r / min. The control of the ball core size is determined by screening, and its diameter is 1- 20mm. According to the above ratio, take the powder required for the shell and fully mix it in the mixer. The activity of calcium oxide and magnesium oxide is ≥ 200...

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Abstract

The invention relates to an external refining method for microalloy steel and special steel, in particular to a compound sphere for external refining desulphurization and fine inclusion removal and a preparation method thereof. The compound sphere is the preferred compound sphere for refining desulphurization and fine inclusion removal of various microalloy steel or special steel. The compound sphere consists of a spherical core and a shell, wherein, the spherical core mainly comprises low melting point premelting slag powder, calcium carbonate, magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate; and the shell mainly comprises one of calcium oxide or magnesium oxide or a mixture of the calcium oxide and the magnesium oxide. The method has scientific formula and simple and reasonable process, can effectively remove inclusions in molten steel, can realize the quick refining desulphurization of the molten steel until the content of sulfur is lower than 0.0030 percent proven by application, is high in efficiency, steady and short in time, can meet the requirements of different molten steel on the content of the sulfur, greatly improves the quality of refining steel, and reduces smelting cost.

Description

technical field [0001] The invention relates to an out-of-furnace refining method for micro-alloy steel and special steel, in particular to a compound sphere used for out-of-furnace refining desulfurization and removal of fine inclusions and its preparation method, which is a refining desulfurization method for various micro-alloy steels or special steels. , The first choice for removing small inclusions. Background technique [0002] Generally speaking, except for individual steel types such as free-cutting steel, sulfur is a harmful element in steel, which forms sulfide inclusions in steel and reduces the ductility and toughness of steel, especially impact toughness. When sulfur exists in the form of iron sulfide, it will cause hot embrittlement. At the same time, the corrosion resistance of steel with high sulfur content will be greatly reduced, which is also unfavorable to the welding performance of steel. Sulfide stress corrosion cracking (SSCC) can occur in austenitic...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/04
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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