CN103184313B - Steel making composite deoxygenation agent and preparation method thereof - Google Patents

Abstract

The invention relates to a steel making composite deoxygenation agent and a preparation method thereof. The composite deoxygenation agent is formed by processing raw materials of baryta, tourmalin, ferrochromium, molybdenum trioxide, industrial silicon and laterite nickel ore, the chemical components of the composite deoxygenation agent are as follows (in weight percentage): 8 to 10.35 percent of Ba, 12 to 15.03 percent of Ca, 18 to 20.22 percent of Ni, 16 to 18.32 percent of Cr, 9 to 10.43 percent of Mo, 2 to 3.21 percent of C, 0.086 percent or more than 0.086 percent of S, 0.015 percent or more than 0.015 percent of P, 3 percent or more than 3 percent of H2O, and the balance of Fe. The composite deoxygenation agent provided by the invention has the functions of deoxidizing, enhancing steel abrasiveness, and resisting marine corrosion, can enable molten steel manganese to have higher yield, and prevents a tundish water gap and a steel ladle water gap from knobs. Compared with a conventional deoxygenation agent, the steel making composite deoxygenation agent has the advantages that while steel making and refining deoxydation is performed, molten steel runnability can be improved; and therefore, the marine corrosion resisting performance and wear resisting performance of steel can be improved.

Description

A kind of steelmaking composite deoxidizer and preparation method thereof

Technical field

The present invention relates to field of iron and steel smelting, be specifically related to a kind of steelmaking composite deoxidizer and preparation method thereof.

Background technology

Since entering this century, China's output of steel increases sharply, the output of Electric furnace steel making and converter steelmaking accounts for the more than 95% of total output of steel, in these two kinds of method for making steel, all need to add reductor to carry out deoxidation to molten steel, and, the quality of steel, the exploitation of new variety all with steelmaking process in deoxidation closely bound up.At present, in steel making deoxidant, mostly adopt silicomanganese or aluminium alloy, use the former to have silicomanganese recovery rate lower (generally in 75% left and right), in molten steel, have a large amount of deoxidation products Al ₂o ₃, Al ₂o ₃be with wedge angle polygon inclusion, be difficult to remove, to such an extent as in pouring molten steel process, fluidity molten steel is poor, mold gap, the large easy dross of water-coating port, on the other hand, a large amount of Al ₂o ₃accumulate in molten steel, chain is distributed in crystal boundary, and the toughness of steel is had a negative impact.In recent years, every technology fast developments such as oceanic resources detection and exploitation, the degree that following human survival depends on ocean is more and more higher.In the process of development and utilization oceanic resources, steel play a part very important, and titanium or titanium alloy has good corrosion resistance nature in briny environment, but because its price is high, have limited its widespread use.

Summary of the invention

The object of the invention is the deficiency for solving the problems of the technologies described above, a kind of steelmaking composite deoxidizer and preparation method thereof is provided, composite deoxidant alloy of the present invention has deoxidation and improves the wear resistance of steel, the function of sea water corrosion resistant, and can make molten steel manganese have higher recovery rate, middle water containing opening, ladle nozzle non-nodulating.

The present invention is the deficiency solving the problems of the technologies described above, the technical scheme adopting is: a kind of steelmaking composite deoxidizer, described composite deoxidant forms taking barite, calcium carbide, ferrochrome, molybdic oxide, industrial silicon and red soil nickel ore as Raw material processing, and the chemical composition (% by weight) of composite deoxidant is: Ba 8 ~ 10.35%, Ca 12 ~ 15.03%, Ni 18 ~ 20.22%, Cr 16 ~ 18.32%, Mo 9 ~ 10.43%, C 2 ~ 3.21%, S≤0.086%, P≤0.015%, H ₂o≤3%, surplus is Fe.

A preparation method for steelmaking composite deoxidizer, comprises the following steps:

(1), batching: get by weight percentage barite 10 ~ 14%, calcium carbide 13 ~ 16%, ferrochrome 21 ~ 26%, molybdic oxide 10 ~ 12%, industrial silicon 10 ~ 12% and red soil nickel ore 22 ~ 25%, by small, broken bits each component to mean particle size be 8mm, after mix, for subsequent use;

(2), melting: the raw material of above-mentioned preparation is poured in induction furnace, be warming up to 300 ~ 320 DEG C and be incubated 30min, in insulating process, raw material is fully stirred, when insulation finishes rear continuation heating, temperature rises to 1550 DEG C, then controlling teeming temperature is 1450 DEG C, and the liquid in induction furnace is poured in cover half pot, naturally cools to room temperature, then be broken into the particle of 8 ~ 10mm, obtain composite deoxidant finished product after adopting double-deck peritonaeum packaging.

beneficial effect

Composite deoxidant of the present invention has deoxidation and improves the wear resistance of steel, the function of sea water corrosion resistant, and can make molten steel manganese have higher recovery rate, middle water containing opening, ladle nozzle non-nodulating, with existing reductor comparison, in steel-making, refinement and deoxidation, can improve fluidity molten steel, thereby improve seawater corrosion resistance, the wear resisting property of steel, reduce steel-making cost.And the present invention utilizes the discarded secondary resource of occurring in nature as starting material, and preparation cost is low, has good economic benefit and social benefit, is convenient to utilization and extention.

Embodiment

A kind of steelmaking composite deoxidizer, described composite deoxidant forms taking barite, calcium carbide, ferrochrome, molybdic oxide, industrial silicon and red soil nickel ore as Raw material processing, and the chemical composition (% by weight) of composite deoxidant is: Ba 8 ~ 10.35%, Ca 12 ~ 15.03%, Ni 18 ~ 20.22%, Cr 16 ~ 18.32%, Mo 9 ~ 10.43%, C 2 ~ 3.21%, S≤0.086%, P≤0.015%, H ₂o≤3%, surplus is Fe.

A preparation method for steelmaking composite deoxidizer, comprises the following steps:

(1), batching: get by weight percentage barite 10 ~ 14%, calcium carbide 13 ~ 16%, ferrochrome 21 ~ 26%, molybdic oxide 10 ~ 12%, industrial silicon 10 ~ 12% and red soil nickel ore 22 ~ 25%, by small, broken bits each component to mean particle size be 8mm, after mix, for subsequent use;

(2), melting: the raw material of above-mentioned preparation is poured in induction furnace, be warming up to 300 ~ 320 DEG C and be incubated 30min, in insulating process, raw material is fully stirred, when insulation finishes rear continuation heating, temperature rises to 1550 DEG C, then controlling teeming temperature is 1450 DEG C, and the liquid in induction furnace is poured in cover half pot, naturally cools to room temperature, then be broken into the particle of 8 ~ 10mm, obtain composite deoxidant finished product after adopting double-deck peritonaeum packaging.

embodiment 1

A preparation method for steelmaking composite deoxidizer, comprises the following steps:

(1), batching: get by weight percentage barite 14%, calcium carbide 16%, ferrochrome 21%, molybdic oxide 12%, industrial silicon 12% and red soil nickel ore 25%, by small, broken bits each component to mean particle size be 8mm, after mix, for subsequent use;

(2), melting: the raw material of above-mentioned preparation is poured in induction furnace, be warming up to 300 DEG C and be incubated 30min, in insulating process, raw material is fully stirred, when insulation finishes rear continuation heating, temperature rises to 1550 DEG C, then by the liquid cover half pot in induction furnace, naturally cool to room temperature, be broken into 8 ~ 10mm left and right particle, double-deck peritonaeum packaging can become finished product;

The fundamental property that in product of the present invention, each chemical element has:

Chromium belongs to VI B element in the periodic table of elements, and nucleidic mass is 51.99, and 1857 DEG C of fusing points, have ductility, has silvery white gloss metal, and the content of chromium in the earth's crust is 0.01%, exists with compound form at occurring in nature.Chrome metal powder has high strength and erosion resistance, forms corrosion-resisting alloy layer on the surface of steel or iron.

Molybdenum belongs to transition element in the periodic table of elements, and nucleidic mass is 95.94,2610 DEG C of fusing points.Silvery white metal is hard and tough and tensile.In steel alloy, adding molybdenum can improve elastic limit, corrosion resistance and keep permanent magnetism etc.Molybdenum is mainly as interpolation element, superalloy and the specific alloy of iron and steel.

Nickel belongs to VIII B element in the periodic table of elements, and nucleidic mass is 58.69,1455 DEG C of fusing points.Silvery white metal, the content of nickel in the earth's crust is 80ppm, the erosion resistance having had.

Calcium belongs to II A element in the periodic table of elements, and nucleidic mass is 40.08,839 ° of C of fusing point, and calcium is silvery white in color, and is element the most active in alkaline-earth metal.At high temperature can reduce the oxide compound of most metals element, be good deoxidant element.

Barium belongs to II A element in the periodic table of elements, and nucleidic mass is 137.33,725 ° of C of fusing point, in alkaline-earth metal compared with active metal, the content in the earth's crust is 0.05%.All exist with the form of compound at occurring in nature, be commonly used to alloying, barium salt and fireworks.

The basic role that in product of the present invention, each chemical element rises:

Mo and Cr:Mo, Cr can effectively improve stainless steel pitting corrosion, and it is more outstanding that the effect of Mo shows.Thereby molybdenum improves its corrosion resistance nature by increasing stainless passivation, after stainless steel chromatize, can greatly improve its erosion resistance.

Ni: nickel can form austenite in steel, the tissue of Chromium Stainless Steel, because adding nickel that significant variation occurs, makes stainless processing performance and corrosion resistance nature obtain some improvement.

Ca and Ba: outermost layer has two electronics, very easily with oxygen generation chemical reaction, there is stronger deoxidizing capacity, on the oxide compound of generation low melting point, float on metallic surface, become slag, while having avoided using aluminium deoxidation, the Al2O3 that secondary oxidation produces is mingled with and stops up molten steel at great Bao, middle water containing opening place.

When pouring refining bag into, molten steel by converter after decarburization, desiliconization and dephosphorization adds silicomanganese in ladle, add-on is 9Kg/t, molten steel falls after 1/3, in refining ladle, add the made alloy of the present invention, add-on is 4Kg/t, controlling molten steel temperature is 1650 DEG C, refining 15min left and right in ladle.

In this stove continuous casting of molten steel process, without dross phenomenon, finished product oxygen content in steel has reduced 19ppm, and sulphur in steel reduces by 30%, because the existence of Cr, Ni and Mo in Finished Steel has improved seawater corrosion resistance and the wear resisting property of Finished Steel significantly.

embodiment 2

A preparation method for steelmaking composite deoxidizer, comprises the following steps:

(1), batching: get by weight percentage barite 10%, calcium carbide 16%, ferrochrome 26%, molybdic oxide 12%, industrial silicon 12% and red soil nickel ore 25%, by small, broken bits each component to mean particle size be 8mm, after mix, for subsequent use;

(2), melting: the raw material of above-mentioned preparation is poured in induction furnace, be warming up to 310 DEG C and be incubated 30min, in insulating process, raw material is fully stirred, when insulation finishes rear continuation heating, temperature rises to 1550 DEG C, then by the liquid cover half pot in induction furnace, naturally cool to room temperature, be broken into 8 ~ 10mm left and right particle, double-deck peritonaeum packaging can become finished product;

embodiment 3

A preparation method for steelmaking composite deoxidizer, comprises the following steps:

(1), batching: get by weight percentage barite 14%, calcium carbide 16%, ferrochrome 26%, molybdic oxide 12%, industrial silicon 12% and red soil nickel ore 22%, by small, broken bits each component to mean particle size be 8mm, after mix, for subsequent use;

(2), melting: the raw material of above-mentioned preparation is poured in induction furnace, be warming up to 320 DEG C and be incubated 30min, in insulating process, raw material is fully stirred, when insulation finishes rear continuation heating, temperature rises to 1550 DEG C, then by the liquid cover half pot in induction furnace, naturally cool to room temperature, be broken into 8 ~ 10mm left and right particle, double-deck peritonaeum packaging can become finished product;

To hold three subject matters preparing in alloy process: 1 wants preferred raw material, in starting material, foreign matter content must be within the scope of regulation, 2 starting material must mix before entering induction furnace, so that each chemical composition is fully reaction in reaction zone, 3 temperature are at 300 ~ 320 DEG C, at least keep 30min, make the abundant silicon reduction of molybdic oxide become molybdenum, avoid molybdic oxide 600 DEG C of distillations.

Claims (2)

1. a steelmaking composite deoxidizer, it is characterized in that: described composite deoxidant forms taking barite, calcium carbide, ferrochrome, molybdic oxide, industrial silicon and red soil nickel ore as Raw material processing, the chemical composition (% by weight) of composite deoxidant is: Ba 8 ~ 10.35%, Ca 12 ~ 15.03%, Ni 18 ~ 20.22%, Cr 16 ~ 18.32%, Mo 9 ~ 10.43%, C 2 ~ 3.21%, S≤0.086%, P≤0.015%, H ₂o≤3%, surplus is Fe.

2. the preparation method of a kind of steelmaking composite deoxidizer as claimed in claim 1, is characterized in that: comprise the following steps:

(1), batching: get by weight percentage barite 10 ~ 14%, calcium carbide 13 ~ 16%, ferrochrome 21 ~ 26%, molybdic oxide 10 ~ 12%, industrial silicon 10 ~ 12% and red soil nickel ore 22 ~ 25%, by small, broken bits each component to mean particle size be 8mm, after mix, for subsequent use;

(2), melting: the raw material of above-mentioned preparation is poured in induction furnace, be warming up to 300 ~ 320 DEG C and be incubated 30min, in insulating process, raw material is fully stirred, when insulation finishes rear continuation heating, temperature rises to 1550 DEG C, then controlling teeming temperature is 1450 DEG C, and the liquid in induction furnace is poured in cover half pot, naturally cools to room temperature, then be broken into the particle of 8 ~ 10mm, obtain composite deoxidant finished product after adopting double-deck peritonaeum packaging.