CN1818088B - Steel smelting and carburating method - Google Patents
Steel smelting and carburating method Download PDFInfo
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- CN1818088B CN1818088B CN 200610024631 CN200610024631A CN1818088B CN 1818088 B CN1818088 B CN 1818088B CN 200610024631 CN200610024631 CN 200610024631 CN 200610024631 A CN200610024631 A CN 200610024631A CN 1818088 B CN1818088 B CN 1818088B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000003723 Smelting Methods 0.000 title claims description 16
- 239000000463 material Substances 0.000 claims abstract description 59
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 23
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 15
- 239000003575 carbonaceous material Substances 0.000 claims description 8
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 229920002472 Starch Polymers 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 7
- 239000008107 starch Substances 0.000 claims description 7
- 235000019698 starch Nutrition 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 6
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000571 coke Substances 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 3
- 230000008961 swelling Effects 0.000 claims description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims description 2
- 239000004568 cement Substances 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims description 2
- 239000006253 pitch coke Substances 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 2
- 239000006188 syrup Substances 0.000 claims description 2
- 235000020357 syrup Nutrition 0.000 claims description 2
- 239000011572 manganese Substances 0.000 abstract description 20
- 229910052748 manganese Inorganic materials 0.000 abstract description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 description 14
- 239000007770 graphite material Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000013590 bulk material Substances 0.000 description 5
- 238000000748 compression moulding Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000013467 fragmentation Methods 0.000 description 3
- 238000006062 fragmentation reaction Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- -1 this Chemical compound 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention refers to the method of carbon pickup for steel production. The massive material including the manganese iron powder with the high Mn and the C is added into the liquid steel as the least water ratio according to the demand for the C. the advantage of it is: the material can reach the inner of the liquid steel and it would not lead the temperature loss, also it can increase the manganese.
Description
Technical field
The present invention relates to the metallurgical class of iron, relate to a kind of method of steel-smelting and carburating concretely.
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 the refining of molten steel feelings is stirred, 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 the carbon materials of 65%-; (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 28%-34%, and containing of the content of Mn and C is flux matched, makes mixed material proportion should be not less than 2.7 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 caking 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 30%-52%.
When above-mentioned caking agent used, if select alkaline caking agent, effect was best, and this caking 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; melt inner the loosing of molten steel; 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 65% ferromanganese powder, its C content is 6%; (C) 36.5 kilograms above-mentioned graphite material and 62 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, mix that C content is 32.92% in the material of back, containing the Mn amount is 40.3%; (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 the 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 85% graphite material; (B) provide a kind of Mn of containing to measure 71% ferromanganese powder, its C content is 6%; (C) 33 kilograms above-mentioned graphite material and 66 kilograms 0.8 kilogram of above-mentioned ferromanganese powder, starch, sheet alkali are mixed for 0.2 kilogram, C content is 32.01% in the material of mixing back, and containing the Mn amount is 46.86%; (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%-94.39%, 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 85% graphite material; (B) provide a kind of Mn of containing to measure 73% ferromanganese powder, its C content is 6%; (C) 33 kilograms above-mentioned graphite material and 62 kilograms above-mentioned ferromanganese powder, calcium aluminate are mixed for 5 kilograms, C content is 31.77% in the material of mixing back, and containing the Mn amount is 45.26%; (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 80.12%-94.39%, visible carburetting recovery rate height, and have only 12.27% 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, can adsorb steel inclusion, and molten steel is played cleanup action.
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 20 mm-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 in the conventional recarburization process in the past,, carburetting precision less to middle low carbon steel kind carbon increasing amount is difficult for the weakness of raising, under the prerequisite of the specified Mn composition range permission of steel grade, in mixing material, suitably improve the allocation ratio of Mn, to improve its proportion, do the recovery rate that can improve with Stable Carbon like this, facts have proved, this method is successful.
In the implementation process, the embodiment of the invention is used for middle low carbon steel, this type of steel grade carbon content is between 0.20%-0.35%, and carbon increasing amount is little, and the tolerance range of carburetting is simultaneously had relatively high expectations, and effect is as follows:
For example be used for the 25# steel, common carburetion method contrast in detected result and the prior art:
Test station: converter tapping
| Heat | 1 | 2 | 3 | 4 | 5 | 6 | On average | Fluctuation range |
| Carburetting recovery rate of the present invention (%) | 86.46 | 94.39 | 82.12 | 86.30 | 84.21 | 85.20 | 86.45 | 12.27 |
| Usual way carburetting recovery rate (%) | 83.79 | 84.89 | 51.08 | 71.15 | 58.08 | 70.86 | 69.98 | 33.81 |
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 the silicon sol that adds same amount and starch and sheet alkali, 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 (7)
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 28%-34%, and the content of Mn is 30%-52%, makes mixed material proportion should be not less than 2.7 gram per centimeters
3, in above-mentioned mixing material, adding a kind of high temperature swelling agent, addition is 0.2%-0.8%, described high temperature swelling agent adopts is expansion multiple greater than 50 times expanded graphite; (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, in mixing material, should provide a kind of binding agent, this binding agent comprises a kind of in starch, sheet alkali, calcium aluminate, carboxyl methyl cellulose, syrup, polyvinyl alcohol, cement, the wilkinite at least, and the addition of this binding agent accounts for the 0.5%-5% of mixing material total amount.
4. 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.
5. 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%.
6. 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.
7. 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610024631 CN1818088B (en) | 2006-03-13 | 2006-03-13 | Steel smelting and carburating method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610024631 CN1818088B (en) | 2006-03-13 | 2006-03-13 | Steel smelting and carburating method |
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| CN1818088B true CN1818088B (en) | 2011-08-10 |
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| 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 |
-
2006
- 2006-03-13 CN CN 200610024631 patent/CN1818088B/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 METALLURGICAL TECHNOLOGY CO., LT 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 METALLURGY TECHNOLOGY CO.,LTD. Address before: Baoshan District Shidongkou 200942 Shanghai Road No. 1 Patentee before: Shanghai Shengbao Iron and Steel Metallurgical Furnace Burden Co.,Ltd. |