CN100392114C - Steel-smelting and carburating method - Google Patents
Steel-smelting and carburating method Download PDFInfo
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- CN100392114C CN100392114C CNB2006100246308A CN200610024630A CN100392114C CN 100392114 C CN100392114 C CN 100392114C CN B2006100246308 A CNB2006100246308 A CN B2006100246308A CN 200610024630 A CN200610024630 A CN 200610024630A CN 100392114 C CN100392114 C CN 100392114C
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Abstract
The present invention relates to metallurgy, more specifically a method for carburization in steel making. In the method, ferromanganese powder containing more Mn is mixed with C to form a bulk material; according to the demand of molten steel to C, the material is added to molten steel under the condition of very low water ratio to obtain a good carburizing effect. The present invention has the advantages that the carburizing material can enter the molten steel and dispersedly dissolve inside the molten steel, and the temperature of the molten steel is not lost; during carburization, manganese is increased at the time of stably and efficiently increasing carbon; the consumption of the alloy for steel making is saved, and the steel making cost is lowered.
Description
Technical field
The present invention relates to metallurgical class, relate to a kind of method of steel-smelting and carburating specifically.
Background technology
In order to adjust the carbon content in the steel,, in steelmaking process, need carry out the carburetting of molten steel usually to reach the steel grade specification requirement.Because the proportion of C is lighter, the situation that carbon content in the steel is lower than the steel grade lower limit and is higher than the steel grade upper limit usually takes place in the interpolation process, it is low to cause steel mill's kind to be smelt rate easily, more seriously can produce waste product.The proportion of carburelant is little, and granularity is inhomogeneous, it is the major cause that causes above-mentioned defective, in launch process, powdery small-particle carburetting material contacts with air under the condition of high temperature easily oxidation takes place, the carburetting material that particle is big can not in time be absorbed by molten steel, cause the rate of recovery low, and finely powdered carburetting material flies upward easily, burning easily, cause very serious environmental issue, so people consider C and metallic substance (for example iron) are constituted carburelant, to increase its proportion, but because the content of its iron is too high, iron can cause the extra loss of liquid steel temperature, and this product addition is many more, and is big more to the molten steel temperature drop influence, if but addition is few, then do not reach the carburetting requirement.The component of C and metal alloy compositions is selected most important for additive effect in addition, this is because what of each component content are very big to the quality influence of molten steel in the material, therefore the addition in adding the carbon process is difficult to control arbitrarily according to the demand of C, and the corresponding carbon effect that adds is not easy to control.The best effects of carburelant is at present: generally add when liquid steel refining stirs, the carburetting recovery rate reaches 25% between the wave zone between 70%-95%, add in the steel melting furnace tapping process, and the carburetting recovery rate reaches 35% at 50%-85% between the wave zone.
Summary of the invention
The objective of the invention is at above-mentioned the deficiencies in the prior art part, a kind of method of steel-smelting and carburating is provided, this method employing contains higher ferromanganese powder and the C of Mn amount and is mixed into bulk material, according to molten steel to what of the demand of C, to insert in the molten steel under the situation of this material with utmost point low-water-content, to reach extraordinary carburetting effect.
Technical scheme of the present invention is as follows:
A kind of method of steel-smelting and carburating is characterized in that this method comprises the steps: that (A) provides a kind of C content to be not less than 65% carbon materials; (B) provide a kind of Mn of containing amount to be not less than 50% ferromanganese powder; (C) a certain amount of carbon materials and a certain amount of ferromanganese powder are mixed, in the mixed material, the content of C should be controlled at 24.04%-28%, and containing of the content of Mn and C is flux matched, makes mixed material proportion should be not less than 2.8 gram per centimeters
3(D) mixed forming materials is handled; (E) with the molded material drying treatment; (F), in molten steel, add the material behind the above-mentioned shaping and drying of respective numbers according to the carburetting requirement of different steel grades.
During forming processes, should provide a kind of binding agent in mixing material, this binding agent comprises a kind of in starch, sheet alkali, calcium aluminate, carboxyl methyl cellulose, syrup, polyvinyl alcohol, cement, the wilkinite at least.
Forming processes is for block with compression moulding in the mixed material adding shaper.
Usually carbon materials is selected from least a in coke, pitch coke, refinery coke, carbon dust, calcining coal and the graphite.The granularity of carbon materials and ferromanganese powder is not more than 10mm.
Drying treatment is to place kiln dry molded material, and the water ratio of dry back material is less than 0.5%.
When adding after the moulding material in molten steel, can be interpolation when liquid steel refining stirs, also can be to add in the steel melting furnace tapping process.
In the common mixed material, the content of Mn is 35%-62%.
When above-mentioned caking agent uses, if select alkaline binding agent, best results, this binding agent comprises a kind of in starch, sheet alkali, the calcium aluminate at least.
Advantage of the present invention is that the material of carburetting can enter molten steel inside; and it is molten to loose in inside; and can not cause the temperature loss of molten steel; the interpolation of ferromanganese powder in the carburetting process; both increased the proportion of carburetting material; can replenish in the molten steel demand again to manganese; that is to say and also realized increasing manganese when realizing stability and high efficiency carburetting; saved and made steel the consumption of used alloy; reduced steel-making cost, Mn and C give mutual protection, and have improved both sides' oxidation-resistance; its addition can add how much selecting of C amount according to the molten steel needs, has guaranteed the carburetting effect.
Concrete technical scheme
By the following examples feature of the present invention and other correlated characteristic are described in further detail, so that technician's of the same trade understanding:
Embodiment 1:
Add materials with 100 kilograms and calculate, the method for the steel-smelting and carburating of present embodiment comprises the steps: that (A) provides C content is 80% graphite material; (B) provide a kind of Mn of containing to measure 71% ferromanganese powder, its C content is 6%; (C) 24.5 kilograms above-mentioned graphite material and 74 kilograms 0.2 kilogram in 1.0 kilograms of above-mentioned ferromanganese powder, starch, sheet alkali, the expanded graphite that expansion multiple is 100 times mixed for 0.3 kilogram, C content is 24.04% in the material of mixing back, and containing the Mn amount is 52.54%; (D) mixed forming materials is handled, be about to mixed material and add the interior compression moulding of shaper for block; (E) with the molded material drying treatment, be about to molded material and place kiln dry, the water ratio of dry back material is controlled at less than 0.5%; (F) what of carbon increasing amount on demand, when the liquid steel refining Argon stirs in molten steel bulk material behind the interpolation shaping and drying.
Graphite material and ferromanganese powder granularity 0-10mm, can be with after graphite and the ferromanganese fragmentation, divide through the 10mm mesh screen to obtain.
The carburetting recovery rate of present embodiment can reach 88.2%-96.12%, visible carburetting recovery rate height, and have only 7.92% between the wave zone.
Embodiment 2:
Add materials with 100 kilograms and calculate, the method for the steel-smelting and carburating of present embodiment comprises the steps: that (A) provides C content is 78% graphite material; (B) provide a kind of Mn of containing to measure 73% ferromanganese powder, its C content is 6%; (C) 28 kilograms above-mentioned graphite material and 71 kilograms 0.8 kilogram of above-mentioned ferromanganese powder, starch, sheet alkali are mixed for 0.2 kilogram, C content is 26.1% in the material of mixing back, and containing the Mn amount is 51.83%; (D) mixed forming materials is handled, be about to mixed material and add the interior compression moulding of shaper for block; (E) with the molded material drying treatment, be about to molded material and place kiln dry, the water ratio of dry back material is controlled at less than 0.5%; (F) what of carbon increasing amount are on demand added the bulk material behind the shaping and drying in molten steel in the steel melting furnace tapping process.
Graphite material and ferromanganese powder granularity 0-10mm, can be with after graphite and the ferromanganese fragmentation, divide through the 10mm mesh screen to obtain.
The carburetting recovery rate of present embodiment can reach 82.12%-94.3%, visible carburetting recovery rate height, and have only 12.27% between the wave zone.
Embodiment 3:
Add materials with 100 kilograms and calculate, the method for the steel-smelting and carburating of present embodiment comprises the steps: that (A) provides C content is 80% graphite material; (B) provide a kind of Mn of containing to measure 73% ferromanganese powder, its C content is 6%; (C) 26 kilograms above-mentioned graphite material and 69 kilograms above-mentioned ferromanganese powder, calcium aluminate are mixed for 5 kilograms, C content is 24.94% in the material of mixing back, and containing the Mn amount is 50.37%; (D) mixed forming materials is handled, be about to mixed material and add the interior compression moulding of shaper for block; (E) with the molded material drying treatment, be about to molded material and place kiln dry, the water ratio of dry back material is controlled at less than 0.5%; (F) what of carbon increasing amount are on demand added the bulk material behind the shaping and drying in molten steel in the steel melting furnace tapping process.
Graphite material and ferromanganese powder granularity 0-10mm, can be with after graphite and the ferromanganese fragmentation, divide through the 10mm mesh screen to obtain.
The carburetting recovery rate of present embodiment can reach 81.92%-94.62%, visible carburetting recovery rate height, and have only 13.33% between the wave zone.
The use of present embodiment calcium aluminate, because its fusing point is low, component is reasonable, when adding molten steel, can be fused into liquid rapidly, plays and cleans the molten steel effect, can adsorb steel inclusion.
The forming processing method of material and drying method are that those skilled in the art institute is understood easily in the foregoing description, repeat no more.
Bulk material in the foregoing description after the moulding can be to be ellipse, circle or square, and its granularity generally is controlled at 20mm-50mm.
The present invention has increased reducing atmosphere for the two be used in combination than single interpolation C of Mn and C, has improved the resistance of oxidation of material mutually, has improved recovery rate separately (rate of recovery).Selecting Mn and the two bonded Another reason of C is because most steel grades need to add a large amount of Mn in smelting process, makes and be convenient to adjust the add-on of adding material in the process of molten steel recarburization.Add molten steel if use other metallic element such as Cr, Ni, Cu, W, Mo etc. to combine, the quality of most steel grades is done harm rather than good with carbon.
The present invention will select to determine to add the quality of material and the proportioning of corresponding each component according to the composition and the specification of quality of different steel grades, thereby addition what are determined in the specific implementation.
The embodiment of the invention is at little to low-carbon (LC) steel grade carbon increasing amount in the conventional recarburization process in the past, the shortcoming that precision is difficult to improve, under the prerequisite of the specified Mn composition range permission of steel grade, in mixing material, improve the allocation ratio of Mn as far as possible, to improve its proportion, do the recovery rate that can further improve with Stable Carbon like this, facts have proved, this method success.
In the implementation process, the embodiment of the invention is used for the soft steel carbon content less than 0.20% steel grade, as Q235, A, B etc., this class steel grade carbon content is low, and carbon increasing amount is little, but requires the tolerance range height of carburetting, and effect is as follows:
For example be used for steel grade Q235, common carburetion method contrast in detected result and the prior art:
Test station: LF ladle refining furnace.
| Heat | 1 | 2 | 3 | 4 | 5 | 6 | On average | Fluctuation range |
| Carburetting recovery rate of the present invention (%) | 92.36 | 88.20 | 96.12 | 93.29 | 93.26 | 92.88 | 92.69 | 7.92 |
| Usual way carburetting recovery rate (%) | 78.68 | 70.38 | 93.30 | 77.05 | 82.72 | 75.22 | 79.56 | 22.92 |
The addition of binding agent accounts for the 0.5%-5% of mixing material total amount in the foregoing description.
The present invention selects alkaline binding agent, as starch, sheet alkali, does not reduce the basicity in the slag, and is pollution-free to molten steel, and the while can increase the intensity after the product balling-up.
The contriver found through experiments, and compares as binding agent with silicon sol and starch, the sheet alkali that adds same amount, and intensity can be more than 2 times of intensity after the former balling-up after latter's balling-up.
Add the carbonate of 2%-8% in the expanded graphite swelling agent that 0.2%-0.8% also find is added in experiment and the prior art and compare as melting promotor, the former loose the molten time less than 30 seconds, and the latter loose the molten time at 2-4 minute.And produce great amount of carbon dioxide gas because carbonate decomposes in hot conditions, easily cause molten steel splash and cooling, then there is not the above-mentioned hidden danger of carbonate as melting promotor in the present invention.
The present invention compares with the size range 0.5mm-6mm that uses in the prior art for the selection of 0-10mm starting material size range, has outstanding marked improvement:
At first cut down finished cost, its tooling cost of particle that for example ferromanganese is worked into 0.5mm-6mm is 3 times of particulate tooling cost that ferromanganese are worked into 0-10mm.
Next is to have made full use of resource, for example after the requirement processing of graphite material according to 0.5mm-6mm, the product that the 0-0.5mm fine powder accounts for after the processing is over half, and this part can't be used, and the present invention can utilize it, and resource utilization obviously can be enhanced about more than once.
Moreover, make faster in molten steel, the easier absorption of product because the present invention has utilized the fine powder of 0-0.5mm.
Last the present invention has utilized fine powder and the 6mm-10mm particle of 0-0.5mm, has optimized size-grade distribution greatly, improves the density of formed product, corresponding intensity and the proportion that has improved product.
Claims (12)
1. the method for a steel-smelting and carburating is characterized in that this method comprises the steps: that (A) provides a kind of C content to be not less than 65% carbon materials; (B) provide a kind of Mn of containing amount to be not less than 50% ferromanganese powder; (C) a certain amount of carbon materials and a certain amount of ferromanganese powder are mixed, in the mixed material, the content of C should be controlled at 24.04%-28%, and containing of the content of Mn and C is flux matched, the content of Mn is 35%-62%, makes mixed material proportion should be not less than 2.8 gram per centimeters
3(D) mixed forming materials is handled; (E) with the molded material drying treatment; (F), in molten steel, add the material behind the above-mentioned shaping and drying of respective numbers according to the carburetting requirement of different steel grades.
2. the method for a kind of steel-smelting and carburating according to claim 1 is characterized in that described carbon materials, is selected from least a in coke, pitch coke, refinery coke, carbon dust, calcining coal and the graphite.
3. the method for a kind of steel-smelting and carburating according to claim 1, it is characterized in that when forming processes, should provide a kind of binding agent in mixing material, this binding agent comprises a kind of in starch, sheet alkali, calcium aluminate, carboxyl methyl cellulose, syrup, polyvinyl alcohol, cement, the wilkinite at least.
4. the method for a kind of steel-smelting and carburating according to claim 3 is characterized in that the addition of binding agent accounts for the 0.5%-5% of mixing material total amount.
5. the method for a kind of steel-smelting and carburating according to claim 3 is characterized in that described caking agent is alkaline binding agent, and this binding agent comprises a kind of in starch, sheet alkali, the calcium aluminate at least.
6. the method for a kind of steel-smelting and carburating according to claim 1 is characterized in that described forming processes is for block with compression moulding in the mixed material adding shaper.
7. the method for a kind of steel-smelting and carburating according to claim 1 is characterized in that the granularity of described carbon materials and ferromanganese powder is not more than 10mm.
8. the method for a kind of steel-smelting and carburating according to claim 1 is characterized in that described drying treatment is to place kiln dry molded material, and the water ratio of dry back material is less than 0.5%.
9. the method for a kind of steel-smelting and carburating according to claim 1 is characterized in that the described material behind the shaping and drying that adds in molten steel, refer to interpolation when liquid steel refining stirs.
10. the method for a kind of steel-smelting and carburating according to claim 1 is characterized in that the described material behind the shaping and drying that adds in molten steel, refer in the steel melting furnace tapping process and add.
11. the method for a kind of steel-smelting and carburating according to claim 1 when it is characterized in that forming processes, should provide a kind of high temperature swelling agent in mixing material, addition is 0.2%-0.8%.
12. the method for a kind of steel-smelting and carburating according to claim 11, what it is characterized in that described high temperature swelling agent adopts is expansion multiple greater than 50 times expanded graphite.
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| CNB2006100246308A CN100392114C (en) | 2006-03-13 | 2006-03-13 | Steel-smelting and carburating method |
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| CNB2006100246308A CN100392114C (en) | 2006-03-13 | 2006-03-13 | Steel-smelting and carburating method |
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| CN100392114C true CN100392114C (en) | 2008-06-04 |
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| CN100429324C (en) * | 2006-09-27 | 2008-10-29 | 西安建筑科技大学 | Aluminum-manganese-carbon alloy ball for steelmaking deoxidization and recarburization and preparation method thereof |
| CN107937659A (en) * | 2017-10-13 | 2018-04-20 | 江苏捷帝机器人股份有限公司 | A kind of efficiently carburetting accelerating agent |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152266A (en) * | 1995-04-10 | 1997-06-18 | 福塞科国际有限公司 | Mould fluxes for use in continuous casting of steel |
| CN1523122A (en) * | 2003-09-04 | 2004-08-25 | 吴光亮 | Carburant for steel-making and producing process and method of using thereof |
| CN1667130A (en) * | 2005-04-11 | 2005-09-14 | 上海盛宝钢铁冶金炉料有限公司 | Carburant for manganese-carbon alloy |
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- 2006-03-13 CN CNB2006100246308A patent/CN100392114C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1152266A (en) * | 1995-04-10 | 1997-06-18 | 福塞科国际有限公司 | Mould fluxes for use in continuous casting of steel |
| CN1523122A (en) * | 2003-09-04 | 2004-08-25 | 吴光亮 | Carburant for steel-making and producing process and method of using thereof |
| CN1667130A (en) * | 2005-04-11 | 2005-09-14 | 上海盛宝钢铁冶金炉料有限公司 | Carburant for manganese-carbon alloy |
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Owner name: SHANGHAI SHENGBAO METALLURGY TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHANGHAI SHENGBAO IRON + STEEL METALLURGICAL FURANCE CHARGE CO. LTD. |
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Address after: Baoshan District Shidongkou 200942 Shanghai Road No. 1 Patentee after: Shanghai Shengbao Metallurgical Technology Co., Ltd. Address before: Baoshan District Shidongkou 200942 Shanghai Road No. 1 Patentee before: Shanghai Shengbao Iron & Steel Metallurgical Furance Charge Co., Ltd. |