CN103667591B - A kind of high ferro is than Electric furnace steel making end point carbon control method - Google Patents
A kind of high ferro is than Electric furnace steel making end point carbon control method Download PDFInfo
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- CN103667591B CN103667591B CN201310707961.1A CN201310707961A CN103667591B CN 103667591 B CN103667591 B CN 103667591B CN 201310707961 A CN201310707961 A CN 201310707961A CN 103667591 B CN103667591 B CN 103667591B
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Abstract
The present invention relates to a kind of high ferro than Electric furnace steel making end point carbon control method, its processing step is: first get a certain amount of steel scrap and the pig iron carries out preheating, put into electric arc furnace after preheating to smelt, add appropriate alloy and auxiliary material as requested, and the continual Cojet oxygen rifle that passes through is to oxygen supply in electric arc furnace, then enough molten iron are reserved or prepared to the hot metal ladle that smelting steel uses at molten iron tipple latter stage, obtain the chemical composition having prepared molten iron, get the chemical composition of the steel smelted in steel sample analysis electric arc furnace, again calculate the molten iron that add quantity in electric arc furnace, and stop oxygen supply in stove, utilize Molten iron chute in stove, add the molten iron calculating and should add according to speed from slow to fast, after last molten iron adds, stove can start tapping.Have and reduce steel making working procedure energy consumption, with low cost, production capacity increases and the measured feature of the steel produced.
Description
Technical field
The invention belongs to metallurgical technology field, relate to a kind of high ferro than Electric furnace steel making end point carbon control method.
Background technology
A kind of Electric furnace steel making end point carbon control method of high ferro ratio, the molten iron add-on of electric furnace is made to reach 960-1000kg/t, and just furnace has cancelled electric energy steel-making, just rely on the physical thermal of molten iron and chemical heat to be smelted by oxygen blast and ensure the required heat energy of steel-making, and thermal equilibrium be by adding appropriate steel scrap, the pig iron, slag making materials regulate, achieve to add slag material, continuously scrap steel preheating continuously, add the high-level efficiency fast pace steel-making that molten iron, continuously oxygen supply smelt continuously.Become reduction blow loss in the control of smelting process end point carbon, reduce the important control technology of steel technology.Along with the raising of molten iron proportion, increasing the weight of of decarburization task, shorten smelting cycle and necessarily be realized by the oxygen supply intensity strengthening smelting process, large oxygen supply intensity makes continuous steelmaking Electric furnace steel making be difficult to control end point carbon the same as " traditional electric furnace ".Usually, at all kinds of steel grade of smelting, during especially high, medium carbon steel steel grade, its carbon content adopts " height draws and re-blows " and " ladle refining carburetting " to control." height draws and re-blows " method is high to quality requirements of raw materials, sample detection speed wants fast, operating skill is wanted precisely, and actually operating difficulty is quite large, and smelting endpoint is difficult to make carbon in steel accurately control to target value, often causes " over-blowing "." ladle refining carburetting " method is that the carbon of first furnace smelting endpoint is controlled lower than target value, then carburelant is used to carry out the method for carburetting at ladle refining process, the dissolved oxygen content using the method for this carburetting to have in molten steel is higher, deoxidation task weight, materials consumption is high, simultaneously also because use a large amount of carburelant can bring contaminating impurity molten steel into, and it is uneven to produce carbon in steel, thus affect the quality of steel, and consumption is increased, the problems such as production cost rising.
Summary of the invention
For overcoming above-mentioned technical disadvantages, the invention provides and a kind ofly control in first furnace smelting process and add a certain amount of molten iron according to the content of terminal sample carbon to enter stove and adjust carbon content in stove, and then tap, have and reduce steel making working procedure energy consumption, with low cost, production capacity increase and the high ferro of the good feature of the steel quality produced than Electric furnace steel making end point carbon control method.
The present invention solves the technological method that its technical problem adopts: a kind of high ferro is than Electric furnace steel making end point carbon control method, and its processing step is as follows:
The first step: get a certain amount of steel scrap and the pig iron carries out preheating, puts into electric arc furnace and smelts, add appropriate alloy and auxiliary material as requested after preheating, and continual by Cojet oxygen rifle to oxygen supply in electric arc furnace;
Second step: enough molten iron are reserved or prepared to the hot metal ladle used at molten iron tipple latter stage by smelting steel;
3rd step: consult understanding daily record of work, obtains the chemical composition having prepared molten iron;
4th step: the chemical composition of getting the steel smelted in steel sample analysis electric arc furnace;
5th step: the carbon target value according to analytical results and smelting steel grade calculates the molten iron that add quantity in electric arc furnace according to molten iron add-on=molten steel amount × (target value carbon content-endpoint carbon content-alloying carbon increasing amount)/molten iron carbon content;
6th step: stop Cojet oxygen rifle to oxygen supply in stove, utilize Molten iron chute in stove, to add the 5th step according to speed from slow to fast and calculate the molten iron that should add, according to the actual add-on of the on-line weighing determination molten iron of stove, namely stop adding close to theoretical addition amount;
7th step: after molten iron adds, stove can start tapping.
The invention has the beneficial effects as follows: effectively can utilize C, Mn, Si useful element in molten iron, avoid the process of the molten iron initial oxidation for carburetting, rear reduction, ferrosilicon, ferromanganese, carburelant and deoxidation material can be saved; Increase output of steel simultaneously; Avoid the problem that molten steel pollutes, molten steel carbon component is uneven using carburelant to bring, improve steel quality; Use present method is smelted, and has rephosphorization phenomenon, and rephosphorization amount depending on molten iron add-on and molten iron phosphorus content, but at steel grades such as smelting HRB335, HRB400, rephosphorization over range phenomenon does not occur; Put into practice by example, often add cost-saved more than 300 yuan of 1 ton of molten iron, produce considerable economic benefit and energy-saving effect, be with a wide range of applications in enterprise of the same type.
Accompanying drawing explanation
Fig. 1 is the main component table of molten iron;
Fig. 2 is production scheme of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
See Fig. 1 and Fig. 2, a kind of high ferro is than Electric furnace steel making end point carbon control method, and its processing step is as follows:
The first step: get a certain amount of steel scrap and the pig iron carries out preheating, puts into electric arc furnace and smelts, add appropriate alloy and auxiliary material as requested after preheating, and continual by Cojet oxygen rifle to oxygen supply in electric arc furnace;
Second step: enough molten iron are reserved or prepared to the hot metal ladle used at molten iron tipple latter stage by smelting steel;
3rd step: consult understanding daily record of work, obtains the chemical composition having prepared molten iron;
4th step: the chemical composition of getting the steel smelted in steel sample analysis electric arc furnace;
5th step: the carbon target value according to analytical results and smelting steel grade calculates the molten iron that add quantity in electric arc furnace according to molten iron add-on=molten steel amount × (target value carbon content-endpoint carbon content-alloying carbon increasing amount)/molten iron carbon content;
6th step: stop Cojet oxygen rifle to oxygen supply in stove, utilize Molten iron chute in stove, to add the 5th step according to speed from slow to fast and calculate the molten iron that should add, according to the actual add-on of the on-line weighing determination molten iron of stove, namely stop adding close to theoretical addition amount;
7th step: after molten iron adds, stove can start tapping.
Test-results shows: the method for making steel adopting high ferro to control than end point carbon, effectively can utilize C, Mn, Si useful element in molten iron, avoid the process of the molten iron initial oxidation for carburetting, rear reduction, can save ferrosilicon, ferromanganese, carburelant and deoxidation material; Increase output of steel simultaneously.Avoid the problem that molten steel pollutes, molten steel carbon component is uneven using carburelant to bring, improve steel quality.Economic benefit: often add cost-saved more than 300 yuan of 1 ton of molten iron, produce considerable economic benefit.Social benefit: make full use of resource, realizes resources conservation, meets national policy.
Claims (1)
1. high ferro is than an Electric furnace steel making end point carbon control method, it is characterized in that processing step is as follows:
The first step: get a certain amount of steel scrap and the pig iron carries out preheating, puts into electric arc furnace and smelts, add appropriate alloy and auxiliary material as requested after preheating, and continual by Cojet oxygen rifle to oxygen supply in electric arc furnace;
Second step: enough molten iron are reserved or prepared to the hot metal ladle used at molten iron tipple latter stage by smelting steel;
3rd step: consult understanding daily record of work, obtains the chemical composition having prepared molten iron;
4th step: the chemical composition of getting the steel smelted in steel sample analysis electric arc furnace;
5th step: the carbon target value according to analytical results and smelting steel grade calculates the molten iron that add quantity in electric arc furnace according to molten iron add-on=molten steel amount × (target value carbon content-endpoint carbon content-alloying carbon increasing amount)/molten iron carbon content;
6th step: stop Cojet oxygen rifle to oxygen supply in stove, utilize Molten iron chute in stove, to add the 5th step according to speed from slow to fast and calculate the molten iron that should add, according to the actual add-on of the on-line weighing determination molten iron of stove, namely stop adding close to theoretical addition amount;
7th step: after molten iron adds, stove can start tapping.
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| CN201310707961.1A CN103667591B (en) | 2013-12-20 | 2013-12-20 | A kind of high ferro is than Electric furnace steel making end point carbon control method |
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| CN201310707961.1A CN103667591B (en) | 2013-12-20 | 2013-12-20 | A kind of high ferro is than Electric furnace steel making end point carbon control method |
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| CN103667591A CN103667591A (en) | 2014-03-26 |
| CN103667591B true CN103667591B (en) | 2016-03-02 |
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| CN106544467B (en) * | 2016-10-31 | 2018-12-04 | 山东钢铁股份有限公司 | A kind of high alloy Low-phosphorus Steel method in high molten iron proportion electric furnace smelting |
| CN112708726A (en) * | 2020-12-14 | 2021-04-27 | 广东韶钢松山股份有限公司 | Electric furnace smelting method for pre-deoxidation by utilizing hot molten iron |
| CN113604630A (en) * | 2021-07-28 | 2021-11-05 | 北京科技大学 | Electric arc furnace steelmaking end point control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1461813A (en) * | 2002-06-02 | 2003-12-17 | 承德新新钒钛股份有限公司 | Steelmaking method using molten iron as carburant |
| CN101225454A (en) * | 2007-01-18 | 2008-07-23 | 天津钢管集团有限公司 | Pre-deoxidation recarburization process for arc furnace steel-smelting molten steel with slag |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1461813A (en) * | 2002-06-02 | 2003-12-17 | 承德新新钒钛股份有限公司 | Steelmaking method using molten iron as carburant |
| CN101225454A (en) * | 2007-01-18 | 2008-07-23 | 天津钢管集团有限公司 | Pre-deoxidation recarburization process for arc furnace steel-smelting molten steel with slag |
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