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Powder preparation additive for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method

An out-of-furnace refining and additive technology is applied in the field of powder additives for removing fine inclusions, out-of-furnace refining and desulfurization, and powder additives. high effect

Inactive 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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  • Powder preparation additive for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method
  • Powder preparation additive for outside-stove refining dephosphorization, removing fine foreign matter and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 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 take 35kg of low melting point pre-melted slag powder, 5kg of calcium fluoride powder, 55kg of calcium oxide powder, and 5kg of calcium carbonate powder with a particle size of 1nm to 3.5mm according to the formula ratio, and put them into the vertical mixer for uniform mixing. 1 to 8 hours, wherein the activity of calcium oxide and magnesium oxide ≥ 200ml; the prepared powder is dried in a drying equipment at 80 to 200°C for 10 to 22 hours to become the finished powder additive, which is cooled to room temperature and then dried. Moisture-proof sealed packaging 500kg / bag, and use within 10 days...

Embodiment 2

[0032] Take CaO10kg and Al according to the formula ratio 2 o 3 50kg, SiO 2 5kg, MgO 5kg, 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 hours, wherein the activity of calcium oxide and magnesium oxide is ≥200ml; the prepared powder is dried in a drying equipment at 100-150°C for 10-22 hours to obtain the finished powder Additive, other are with embodiment 1.

Embodiment 3

[0034] Take CaO70kg and Al according to the formula ratio 2 o 3 15kg, SiO 2 3kg, MgO 2kg, CaF 210kg 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 of calcium oxide and magnesium oxide is ≥200ml; The prepared powder is put into a drying equipment at 70-180°C for drying for 10h-20h to become the finished powder additive, and the others are the same as in Example 1.

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Abstract

The invention relates to an external refining method for microalloy steel and special steel, in particular to a powder additive for external refining desulphurization and fine inclusion removal and a preparation method thereof. The powder additive is the preferred powder additive for refining desulphurization and fine inclusion removal of various microalloy steel or special steel. The powder additive is prepared by mixing raw materials of low melting point premelting slag powder, calcium fluoride, calcium carbonate or magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate, calcium oxide or magnesium oxide or a mixture of the calcium oxide and the magnesium oxide, and adhesive according to a formula. 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 microalloy steel and special steel, in particular to a powder additive used for out-of-furnace refining desulfurization and removal of fine inclusions and its preparation method. , The preferred powder additive for removing fine 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 stainless steel through pitting corrosion, and the source of pitting corrosion is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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