CN104060019A - Steelmaking method with semi-steel - Google Patents
Steelmaking method with semi-steel Download PDFInfo
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Abstract
The invention discloses a steelmaking method with semi-steel. The method includes following steps: carrying out a vanadium-extracting process after vanadium-containing molten iron being desulfurized through molten iron pre-process, adding ferrosilicon during the vanadium-extracting and semi-steel-tapping process, carrying out a vanadium-slag-removing process after the semi-steel is tapped, adding the semi-steel to a converter after the vanadium-slag-removing process, adding waste steel for carrying out a converter steelmaking process, carrying out an argon-blowing process to the tapped molten steel and carrying out a continuous casting process to the molten steel after being subjected to the argon-blowing process. The method is an overall-process production method from molten iron pre-processing to continuous casting during the semi-steel steelmaking method. The method has characteristics of a low cost, a high scrap ratio (50-90 kg steel scrap per ton of the steel), a high tapping temperature (1680-1710 DEG C), a short process and simple operations.
Description
Technical field
The present invention relates to metallurgical technology field, particularly, relate to a kind of Semi-steel making method.
Background technology
China's Panxi Diqu has unique v-ti magnetite ore resources, during blast-furnace smelting, adopt vanadium titano-magnetite, in molten iron, contain higher vanadium (0.20%-0.40%), in order to realize the comprehensive utilization of resource, vanadium in molten iron will carry out vanadium extraction operation through converter, and vanadium oxidation is entered to vanadium slag from vanadium slag, extracts vanadium again.In the time of vanadium extraction vanadium oxide, carbon content has obtained scaling loss in various degree, and silicone content is vestige; While going out half steel, often there is part vanadium slag to flow in half cylinder of steel with steel, cause the waste of vanadium slag, and both affected converter slagging when being blended into converter and making steel containing the half steel of vanadium slag and also affect and spatter slag effect.The more general molten iron of half steel carbon mass percent (3.0%-3.8%) after vanadium extraction is low, in half steel, silicon, manganese heating slagging constituent content are vestige, therefore semisteel smelting have that in converting process, acid slagging material is few, slag system constituent element is single, the feature such as slag formation time evening at initial stage and shortage of heat, this makes semi-steel making more difficult than molten iron-steelmaking, Dephosphorization rate is lower, semisteel smelting will be realized high tapping temperature, and it is very difficult that steel scrap is eaten in converter in a large number.
Have in the prior art the report of semi-steel making technique, if patent application CN1275625A " semi-steel dephosphorizing desulfurizing steel-making technology " is by increasing semi-steel dephosphorizing, sulphur technique containing in the process for making flow process of vanadium iron ore deposit, in half steel after vanadium extraction, add the additives such as calcium oxide-ferric oxide-Calcium Fluoride (Fluorspan) and half steel is blended into converter to promote initial stage dephosphorization, sulphur, create the technical qualification of producing ultra-low phosphoretic steel and Clean Steel.But this patent application only relates to from vanadium extraction dephosphorization, the sulphur technique to converter smelting, and the terminal of not mentioned vanadium extraction and converter steelmaking is controlled and whole process production technique.
In prior art, still do not there is the report of the Semi-steel making method of low cost, high scrap ratio, high tapping temperature, short flow process and the feature such as simple to operate.
Summary of the invention
The object of the invention is in order to overcome above-mentioned defect of the prior art, a kind of Semi-steel making method is provided, whole process production method when the method is a kind of semi-steel making from molten iron pretreatment desulfurizing to continuous casting, has low cost, high scrap ratio, high tapping temperature, short flow process and the feature such as simple to operate.
The present inventor surprisingly finds under study for action, in semi-steel making process, adopt molten iron pretreatment desulfurizing → vanadium extraction → drag for this flow production method of vanadium slag → converter steelmaking → Argon → continuous casting, and when vanadium extraction goes out half steel, add ferrosilicon, can realize low cost, high scrap ratio, high tapping temperature, short flow process and effect simple to operate.
Therefore, to achieve these goals, the invention provides a kind of Semi-steel making method, the method comprises carries out vanadium-bearing hot metal vanadium extraction operation after molten iron pretreatment desulfurizing, when vanadium extraction goes out half steel, add ferrosilicon, gone out after half steel and dragged for vanadium slag operation, in converter, be blended into and drag for the half steel after slag and add steel scrap to carry out converter steelmaking, molten steel after tapping is carried out to Argon processing, and the molten steel after Argon processing is finished carries out continuous casting.
Whole process production method when Semi-steel making method of the present invention is a kind of semi-steel making from molten iron pretreatment desulfurizing to continuous casting, there is low cost, high scrap ratio (50-90kg steel scrap/ton steel), high tapping temperature (1680-1710 ℃), short flow process and the feature such as simple to operate, there is good popularizing application prospect.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
The invention provides a kind of Semi-steel making method, the method comprises carries out vanadium-bearing hot metal vanadium extraction operation after molten iron pretreatment desulfurizing, when going out half steel, vanadium extraction adds ferrosilicon, after having gone out half steel, drag for vanadium slag operation, in converter, be blended into and drag for the half steel after slag and add steel scrap to carry out converter steelmaking, molten steel after tapping is carried out to Argon processing, and the molten steel after Argon processing is finished carries out continuous casting.
In the inventive method, for can smelt obtain vanadium-bearing hot metal there is no particular limitation containing vanadium iron ore, can for conventional various containing vanadium iron ores in this area, for example, can be vanadium titano-magnetite.After being smelted, vanadium titano-magnetite can obtain vanadium-bearing hot metal.The method that adopts v-bearing titanomagnetite smelting to obtain vanadium-bearing hot metal is method well known in the art, for example, can obtain vanadium-bearing hot metal by blast-furnace smelting.
In the inventive method, for the method for vanadium-bearing hot metal being carried out to molten iron pretreatment desulfurizing, there is no particular limitation, can be the conventional various molten iron pretreatment desulfurizing methods in this area, as long as can meet desulfurization, processes rear Sulfur Content in Hot Iron content≤0.025 % by weight.For example, the method for molten iron pretreatment desulfurizing can be KR method.
The present inventor finds under study for action, adds ferrosilicon to be conducive to improve steel-making converter scrap ratio and improve tapping temperature when vanadium extraction goes out half steel.The method of vanadium extraction operation can be vanadium extraction by converter blowing.Under preferable case, when carrying out vanadium extraction operation, half steel Wen Du≤1360 ℃ while operating control vanadium extraction terminal by oxygen blast, half steel carbon during vanadium extraction terminal, containing amount≤3.4 % by weight, adds 2-5kg ferrosilicon/ton steel when vanadium extraction goes out half steel in half cylinder of steel.Wherein, the method that half steel temperature while operating control vanadium extraction terminal by oxygen blast and the method for half steel carbon content are known to the skilled person, for example, can estimate and control according to vanadium extraction later stage carbon drop speed, temperature rise rate and flame situation by controlling oxygen blow duration and oxygen blast intensity.Further preferably, in oxygen blast operation, control oxygen blow duration is 3-6min, and oxygen blast intensity is 1.5-2.5m
3/ (min ton steel).
In the present invention, for the ferrosilicon adding, there is no particular limitation, can be the conventional various ferrosilicon in this area.Under preferable case, ferrosilicon contains Pure Silicon Metals more than 75 % by weight, the iron of 10-15 % by weight, and all the other are impurity.Impurity in ferrosilicon is conventionally known to one of skill in the art, such as comprising the impurity such as P, S.
In the inventive method, drag for vanadium slag and refer to and after having gone out half steel, adopt dragveyer that the vanadium slag of 70-90 % by weight in half cylinder of steel is pulled out, reclaim vanadium in slag.Drag for vanadium slag operation and both avoided the waste of vanadium slag, reduced production cost, while having avoided again half steel containing vanadium slag to be blended into converter making steel on converter slagging with spatter the impact of slag effect.
In the inventive method, converter steelmaking refers to the half steel dragging for after slag is blended into converter smelting, in stove, adds steel scrap after being blended into half steel.Wherein, steel scrap refers to the wastes of iron and steel of the conduct recycling of eliminating in productive life process or damaging, as in Steel Plant's production process, do not become the ferrous waste (as trimming, crop etc.) of product and use after the equipment, the ferrous materials in member scrapped, its carbon content is generally less than 1.0 % by weight, and sulphur, phosphorus content are all not more than 0.03 % by weight.For the steel scrap adding, there is no particular limitation, can be the conventional various steel scraps in this area, and for example steel scrap can be continuously cast bloom cutting head cutting tail and/or hot rolling waste wood.While adding steel scrap in converter, the ferrosilicon consumption that the add-on of steel scrap adds while going out half steel according to vanadium extraction is determined, determine that mode for example can comprise: the basic consumption of steel scrap is 20-40kg steel scrap/ton steel, be preferably 40kg steel scrap/ton steel, when going out half steel, vanadium extraction often adds 1kg ferrosilicon/ton steel, the add-on of steel scrap increases 10-15kg steel scrap/ton steel on the basis of basic consumption, is preferably and increases 10kg steel scrap/ton steel.Wherein, if do not add ferrosilicon, the consumption of the steel scrap adding when the basic consumption of steel scrap goes out half steel for vanadium extraction in converter.Therefore,, while adding steel scrap in converter, according to the add-on of ferrosilicon, adding amount of scrap steel can be 50-90kg steel scrap/ton steel.
In the inventive method, in order to reach the requirement of steel grade tapping temperature, the liquid steel temperature while controlling BOF Steelmaking Endpoint is 1680-1710 ℃.The liquid steel temperature of measuring during according to catch carbon, the liquid steel temperature while operating control BOF Steelmaking Endpoint by oxygen blast.Wherein, by oxygen blast, operate the method that the method for the liquid steel temperature while controlling BOF Steelmaking Endpoint is known to the skilled person, for example can be for estimating according to converter steelmaking later stage carbon drop speed, temperature rise rate and flame situation, or use sublance to measure.For different steel grades, the liquid steel temperature in the time of all can controlling BOF Steelmaking Endpoint is 1680-1710 ℃.When catch carbon, measure liquid steel temperature, if the liquid steel temperature recording, between 1680-1710 ℃, directly carries out tapping steel; If the liquid steel temperature recording lower than 1680 ℃, adds 1-3kg ferrosilicon/ton steel, continue oxygen blast 10-30s, the liquid steel temperature while controlling BOF Steelmaking Endpoint is 1680-1710 ℃, finishes oxygen blast, to reach the temperature requirement of steel grade tapping, and carries out tapping steel.
It will be understood by those skilled in the art that in the inventive method, blowing is Converter Oxigen Blowing smelting, refer to by oxygen gun blowing and other operation and reach the process that molten steel tapping requires.
In the inventive method, in converter steelmaking, finish after blowing, the molten steel after tapping is carried out to Argon processing with fine setting molten steel composition and controls liquid steel temperature.Particularly, the molten steel after tapping is sent into Argon station, at Argon station, finely tune molten steel composition and control liquid steel temperature to reach the requirement of cast steel grade.Although for different steel grades, molten steel composition extremely of final fine setting and the corresponding difference of liquid steel temperature of control at Argon station, but in Argon is processed, for finely tuning the method for molten steel composition and the method for control liquid steel temperature, there is no particular limitation, can be respectively the conventional the whole bag of tricks in this area.For example can be by adding alloy or carbon line fine setting molten steel composition.For example can stir and adjust liquid steel temperature by argon bottom-blowing, that is, can to ladle, stir and adjust liquid steel temperature by the Argon intensity argon bottom-blowing with suitable.Under preferable case, during argon bottom-blowing, BOTTOM ARGON BLOWING intensity is 0.001-0.003m
3/ (min ton steel).Take BOTTOM ARGON BLOWING intensity as 0.001m
3/ (min ton steel), Argon temperature drop calculates by 4 ℃/min, every increase 0.001m
3the BOTTOM ARGON BLOWING intensity of/(min ton steel), temperature drop increases 4-5 ℃/min.While carrying out Argon processing, Argon stirs except can finely tuning liquid steel temperature, can also promote steel grade inclusion floating, improves pourability of molten steel and steel quality.
In the inventive method, the molten steel after Argon processing is finished directly carries out continuous casting.Method for continuous casting is not particularly limited, and can be the method for the conventional various continuous castings in this area.For example can comprise the ladle that the molten steel after Argon processing finishes is housed is transported to turn around table, turn around table turns to after pouring position, molten steel is injected to tundish, tundish is assigned to molten steel in each crystallizer and goes by the mouth of a river again, molten steel constantly passes through water mold so that casting forming rapidly solidification and crystallization, congeal into and foundry goods is pulled straight from the outlet of crystallizer below after duricrust, after cooling, induction stirring, cut into the strand of certain length.
Embodiment
The present invention is further illustrated for following embodiment, but therefore do not limit the present invention.
In following examples, ferrosilicon is purchased from Pangang Group Co., Ltd., and the trade mark is GF-Y.
Continuously cast bloom cutting head cutting tail is the continuously cast bloom cutting head cutting tail that Pangang Group Co., Ltd. produces in strand production process.
Vanadium titano-magnetite picks up from area, Sichuan.
The method of vanadium-bearing hot metal being carried out to molten iron pretreatment desulfurizing is KR method, and rear Sulfur Content in Hot Iron content≤0.025 % by weight is processed in desulfurization.
In half steel carbon content and strand the content of C, Si, Mn, P, S by Atomic Absorption Spectroscopy AAS (purchased from westernization instrument (Beijing) Science and Technology Ltd., model: TNZ1-S) analyze and to record.
Embodiment 1
The present embodiment is used for illustrating Semi-steel making method of the present invention.
Adopt vanadium titano-magnetite to smelt and obtain vanadium-bearing hot metal, vanadium-bearing hot metal carries out vanadium extraction after molten iron pretreatment desulfurizing, and oxygen blow duration is 4min, and oxygen blast intensity is 2m
3/ (min ton steel), during vanadium extraction terminal, half steel temperature is 1360 ℃, during vanadium extraction terminal, half steel carbon content is 3.4 % by weight, when going out half steel, vanadium extraction adds 2kg ferrosilicon/ton steel in half cylinder of steel, after having gone out half steel, adopt dragveyer chain-wales after stove to drag for vanadium slag operation, the vanadium slag of 80 % by weight in half cylinder of steel is pulled out, finished to drag for vanadium slag operation.By dragging for half steel after slag, be blended into 120t steel-making converter and smelt, add 50kg continuously cast bloom cutting head cutting tail/ton steel after being blended into half steel, and the blowing of lower rifle.During catch carbon, with sublance, recording liquid steel temperature is 1660 ℃, now adds 1kg ferrosilicon/ton steel to continue oxygen blast 10s, and obtaining BOF Steelmaking Endpoint liquid steel temperature is 1680 ℃, finishes oxygen blast, carries out tapping steel.After tapping, at Argon station, molten steel composition is adjusted to the claimed range of B (PSL1) steel, and to measure liquid steel temperature be 1600 ℃, now take BOTTOM ARGON BLOWING intensity as 0.001m
3/ (min ton steel) argon bottom-blowing stirs and adjusts liquid steel temperature ladle, after stirring 15min, obtaining liquid steel temperature is 1540 ℃, molten steel after Argon processing is finished is poured into a mould, in during cast, wrapping temperature is 1535 ℃, obtain qualified strand, wherein, in the strand obtaining: C:0.19 % by weight, Si:0.23 % by weight, Mn:0.52 % by weight, P:0.013 % by weight, S:0.010 % by weight.
Embodiment 2
The present embodiment is used for illustrating Semi-steel making method of the present invention.
Adopt vanadium titano-magnetite to smelt and obtain vanadium-bearing hot metal, vanadium-bearing hot metal carries out vanadium extraction after molten iron pretreatment desulfurizing, and oxygen blow duration is 6min, and oxygen blast intensity is 1.5m
3/ (min ton steel), during vanadium extraction terminal, half steel temperature is 1370 ℃, during vanadium extraction terminal, half steel carbon content is 3.5 % by weight, when going out half steel, vanadium extraction adds 4kg ferrosilicon/ton steel in half cylinder of steel, after having gone out half steel, adopt dragveyer chain-wales after stove to drag for vanadium slag operation, the vanadium slag of 70 % by weight in half cylinder of steel is pulled out, finished to drag for vanadium slag operation.Drag for half steel after slag and be blended into 120t steel-making converter and smelt, add 80kg continuously cast bloom cutting head cutting tail/ton steel after being blended into half steel, and the blowing of lower rifle.During catch carbon, with sublance, recording liquid steel temperature is 1685 ℃, now must not add ferrosilicon and re-blow, and directly carries out tapping steel.After tapping, at Argon station, molten steel composition is adjusted to the claimed range of smelting No. 45 carbon constructional quality steels, and to measure liquid steel temperature be 1575 ℃, now take BOTTOM ARGON BLOWING intensity as 0.002m
3/ (min ton steel) argon bottom-blowing stirs and adjusts liquid steel temperature ladle, after stirring 6min, obtaining liquid steel temperature is 1527 ℃, molten steel after Argon processing is finished is poured into a mould, in during cast, wrapping temperature is 1525 ℃, obtain qualified strand, wherein, in the strand obtaining: C:0.45 % by weight, Si:0.25 % by weight, Mn:0.64 % by weight, P:0.014 % by weight, S:0.012 % by weight.
Embodiment 3
The present embodiment is used for illustrating Semi-steel making method of the present invention.
Adopt vanadium titano-magnetite to smelt and obtain vanadium-bearing hot metal, vanadium-bearing hot metal carries out vanadium extraction after molten iron pretreatment desulfurizing, and oxygen blow duration is 3min, and oxygen blast intensity is 2.5m
3/ (min ton steel), during vanadium extraction terminal, half steel temperature is 1360 ℃, during vanadium extraction terminal, half steel carbon content is 3.4 % by weight, when going out half steel, vanadium extraction adds 5kg ferrosilicon/ton steel in half cylinder of steel, after having gone out half steel, adopt dragveyer chain-wales after stove to drag for vanadium slag operation, the vanadium slag of 90 % by weight in half cylinder of steel is pulled out, finished to drag for vanadium slag operation.Drag for half steel after slag and be blended into 120t steel-making converter and smelt, add 90kg continuously cast bloom cutting head cutting tail/ton steel after being blended into half steel, and the blowing of lower rifle.During catch carbon, with sublance, recording liquid steel temperature is 1645 ℃, now adds 2kg ferrosilicon/ton steel to continue oxygen blast 30s, and obtaining BOF Steelmaking Endpoint liquid steel temperature is 1710 ℃, finishes oxygen blast, carries out tapping steel.After tapping, at Argon station, molten steel composition is adjusted to the claimed range of HRB400, and to measure liquid steel temperature be 1615 ℃, now take BOTTOM ARGON BLOWING intensity as 0.003m
3/ (min ton steel) argon bottom-blowing stirs and adjusts liquid steel temperature ladle, after stirring 7min, obtaining liquid steel temperature is 1531 ℃, molten steel after Argon processing is finished is poured into a mould, in during cast, wrapping temperature is 1530 ℃, obtain qualified strand, wherein, in the strand obtaining: C:0.20 % by weight, Si:0.50 % by weight, Mn:1.40 % by weight, P:0.015 % by weight, S:0.011 % by weight.
Whole process production method when Semi-steel making method of the present invention is a kind of semi-steel making from molten iron pretreatment desulfurizing to continuous casting, has low cost, high scrap ratio (50-90kg steel scrap/ton steel), high tapping temperature (1680-1710 ℃), short flow process and the feature such as simple to operate.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, between various embodiment of the present invention, also can carry out arbitrary combination, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a Semi-steel making method, it is characterized in that, the method comprises carries out vanadium-bearing hot metal vanadium extraction operation after molten iron pretreatment desulfurizing, when going out half steel, vanadium extraction adds ferrosilicon, after having gone out half steel, drag for vanadium slag operation, in converter, be blended into and drag for the half steel after slag and add steel scrap to carry out converter steelmaking, the molten steel after tapping is carried out to Argon processing, and the molten steel after Argon processing is finished carries out continuous casting.
2. method according to claim 1, wherein, when carrying out vanadium extraction operation, operate half steel Wen Du≤1360 ℃ while controlling vanadium extraction terminal by oxygen blast, and half steel carbon during vanadium extraction terminal, containing measuring≤3.4 % by weight, adds 2-5kg ferrosilicon/ton steel when vanadium extraction goes out half steel.
3. method according to claim 1, wherein, described ferrosilicon contains Pure Silicon Metals more than 75 % by weight, the iron of 10-15 % by weight, all the other are impurity.
4. method according to claim 1, wherein, steel scrap is continuously cast bloom cutting head cutting tail and/or hot rolling waste wood.
5. method according to claim 1, wherein, pulls the vanadium slag of 70-90 % by weight out while dragging for vanadium slag.
6. method according to claim 2, wherein, while adding steel scrap in converter, the basic consumption of steel scrap is 20-40kg steel scrap/ton steel, when vanadium extraction goes out half steel, often add 1kg ferrosilicon/ton steel, the add-on of steel scrap increases 10-15kg steel scrap/ton steel on the basis of basic consumption.
7. method according to claim 1, wherein, the liquid steel temperature while controlling BOF Steelmaking Endpoint is 1680-1710 ℃.
8. method according to claim 7 wherein, is measured liquid steel temperature when catch carbon, if the liquid steel temperature recording, between 1680-1710 ℃, directly carries out tapping steel; If the liquid steel temperature recording lower than 1680 ℃, adds 1-3kg ferrosilicon/ton steel, continue oxygen blast 10-30s, the liquid steel temperature while controlling BOF Steelmaking Endpoint is 1680-1710 ℃, finishes oxygen blast, carries out tapping steel.
9. method according to claim 1, wherein, during described Argon is processed, is stirred and is adjusted liquid steel temperature by argon bottom-blowing.
10. method according to claim 9, wherein, during described argon bottom-blowing, BOTTOM ARGON BLOWING intensity is 0.001-0.003m
3/ (min ton steel); Take BOTTOM ARGON BLOWING intensity as 0.001m
3/ (min ton steel), Argon temperature drop calculates by 4 ℃/min, every increase 0.001m
3the BOTTOM ARGON BLOWING intensity of/(min ton steel), temperature drop increases 4-5 ℃/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104988274A (en) * | 2015-07-02 | 2015-10-21 | 首钢总公司 | Slagging process for low-phosphorus steel smelting through converter |
| CN108823351A (en) * | 2018-07-04 | 2018-11-16 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of semisteel smelting improves the method and method for making steel of converter scrap ratio |
| CN109097524A (en) * | 2018-09-30 | 2018-12-28 | 四川德胜集团钒钛有限公司 | A kind of method that vanadium extraction semisteel smelting reduces molten steel consumption |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205524A (en) * | 2013-04-15 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting low-sulfur steel from semi-steel |
| CN103627842A (en) * | 2013-11-14 | 2014-03-12 | 攀钢集团研究院有限公司 | Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method |
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2014
- 2014-03-19 CN CN201410103941.8A patent/CN104060019B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205524A (en) * | 2013-04-15 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting low-sulfur steel from semi-steel |
| CN103627842A (en) * | 2013-11-14 | 2014-03-12 | 攀钢集团研究院有限公司 | Method for enhancing end point carbon content in smelting medium-carbon steel from semisteel and semisteel steelmaking method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104988274A (en) * | 2015-07-02 | 2015-10-21 | 首钢总公司 | Slagging process for low-phosphorus steel smelting through converter |
| CN108823351A (en) * | 2018-07-04 | 2018-11-16 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of semisteel smelting improves the method and method for making steel of converter scrap ratio |
| CN109097524A (en) * | 2018-09-30 | 2018-12-28 | 四川德胜集团钒钛有限公司 | A kind of method that vanadium extraction semisteel smelting reduces molten steel consumption |
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| CN104060019B (en) | 2016-04-27 |
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