CN101671762A - Production method for medium and low alloy special steel - Google Patents
Production method for medium and low alloy special steel Download PDFInfo
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- CN101671762A CN101671762A CN200810119937A CN200810119937A CN101671762A CN 101671762 A CN101671762 A CN 101671762A CN 200810119937 A CN200810119937 A CN 200810119937A CN 200810119937 A CN200810119937 A CN 200810119937A CN 101671762 A CN101671762 A CN 101671762A
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Abstract
The invention discloses a production method for medium and low alloy special steel, which comprises the following steps of: smelting with an electric furnace, namely in the electric furnace, adding apart of waste steel in molten ion conveyed from a blast furnace, and carrying out melting and dephosphorization; refining with an argon oxygen decarburization furnace, namely oxidizing and reducing the molten steel conveyed from the electric furnace, wherein the oxidizing and reducing steps comprise decarburization, desulfurization, denitrogenation, dehydrogenation and deoxygenation; and continuously casting, namely, conveying the molten steel refined in the argon oxygen decarburization furnace to a continuous casting machine for casting. The method uses the AOD furnace professionally appliedto the production of stainless steel in the production of the medium and low alloy special steel, and realizes the production of products with multiple varieties, high quality, high efficiency and lowcost because of the optimal combination of a mature hot molten iron charging process for the electric furnace and the intelligent refining technology of the AOD.
Description
Technical field
The present invention relates to a kind of production method of special steel, relate to specifically that (ArgonOxygen Decarburization is during AOD) method is produced, the method for medium and low alloy special steel with argon oxygen decarburization.
Background technology
Electric furnace hot metal charge technology be at present sophisticated be used for carbon junction steel and, the production technique of low alloy steel, its technology constitute generally be blast furnace+electric furnace+ladle furnace (Ladle Furnace, LF)+(vacuum outgas (Vaccum Degassor, VD) stove).Wherein, the blast furnace operation is ironmaking, provides high-carbon liquid steel scrap (molten iron) to electric furnace; The electric furnace operation comprises fusing, dephosphorization, decarburization, intensification etc. as first furnace melting waste steel and a certain proportion of molten iron, and bag interalloyization (adding required most alloys) provides the purified molten steel to the LF stove during tapping; Furnaceman's LF preface is molten steel to be carried out restoring operations such as composition adjustment, desulfurization, deoxidation, intensification; Furnaceman's VD preface is that molten steel is carried out degassing processing (hydrogen, nitrogen, oxygen), microalloy accurate adjustment, temperature adjustment under the vacuum state; Arriving continuous caster at last handles.
Hot metal charge has solved the basic demand of electrosmelting to aspects such as raw material quality, cost, resource are stable, it can effectively control harmful, the residual element of steel, the molten steel purity obviously improves, integrated heat efficiency improves, and melting electric consumption descends, and production efficiency improves, raw materials cost descends, by the 30-40% molten iron, the steel cost per ton 200-300 unit (do not calculate electric furnace production efficiency and quality scale improve, the indirect benefit that the corresponding raising of the magnitude of value is brought) that can descend.But the hot charging ratio is restricted, hot charging than＞40% situation under, the eaf process treatment time is long and recovery rate of iron is obviously on the low side (general＜85%).Especially aborning, during low-carbon (LC) chrome-bearing alloy steel, because its process technology limit, can only carry out alloying, heat up and adjust repeatedly in electric furnace steel tapping and LF operation, be difficult to guarantee that normal organization of production and raw materials cost are very high with expensive humble carbon ferrochrome.
Summary of the invention
In view of this, main purpose of the present invention be to provide a kind of and can reduce cost, raise the efficiency with the kind upgrading in, the production method of medium and low alloy special steel.
For achieving the above object, technical scheme of the present invention be achieved in that a kind of in, the production method of medium and low alloy special steel, it is characterized in that, may further comprise the steps:
A, electrosmelting, the molten iron that in electric furnace blast furnace is transported adds the part steel scrap, melts and dephosphorization;
B, argon oxygen decarburizing furnace refining, the molten steel that electric furnace is transported carries out oxidation, reduction step, and this oxidation, reduction step comprise decarburization, desulfurization, denitrogenation, dehydrogenation and deoxidation;
C, continuous casting are transported to the continuous caster top casting with the argon oxygen decarburizing furnace molten steel after refining.
Between argon oxygen decarburizing furnace refining and continuous casting, this method further comprises ladle furnace refining, carries out trimming and processing again on ladle furnace.
Behind the ladle furnace refining, this method further comprises the vacuum degassing furnace refining, is transported to the continuous caster top casting after finishing vacuum outgas on the vacuum degassing furnace.
Employed microalloy is titanium, boron in the step of carrying out trimming and handling on ladle furnace.
The steel scrap amount that adds in steps A is smaller or equal to 20% of weight ratio.
Specialty is used for AOD stove that stainless steel produces to be used in the production of, medium and low alloy special steel, because the optimum combination of sophisticated electric furnace hot metal charge technology and AOD intelligence refining techniques, many kinds, high quality, high-level efficiency, product output have cheaply been realized.
Description of drawings
Fig. 1 be of the present invention in, the process flow sheet of the production method of medium and low alloy special steel.
Embodiment
Below with reference to the accompanying drawings with embodiment in of the present invention, the production method of medium and low alloy special steel is described further.
As shown in Figure 1, production method of the present invention comprises the steps:
Step 1: electrosmelting, the molten iron that in electric furnace blast furnace is transported adds the part steel scrap, melts and dephosphorization.
Specifically be to use blast furnace to provide the fine liquid raw material to electric furnace, the liquid iron charging ratio can reach 80%, adds the part steel scrap when sending into electric furnace, and the steel scrap amount of this adding is smaller or equal to 20% of weight percent, and only melt with dephosphorization and operate this moment; Do not control the tapping carbon content, tapping temperature control can be lower than decarburization and the warming temperature that 100 ℃ of conventional hot metal charge electric furnace smelting process promptly do not carry out oxidation period, and consumption of electrode, melting electric consumption, body of heater refractory consumption and smelting cycle obviously reduce.
The refining of step 2:AOD stove, the molten steel that electric furnace is transported carries out oxidation, reduction step, comprises decarburization, desulfurization, denitrogenation, dehydrogenation and deoxidation treatment in this oxidation, the reduction portion step.
Specifically be to provide high-carbon, the dephosphorization half steel molten steel of high-quality (high purity) to the AOD stove, carry out the refining of molten steel again by the AOD stove by electric furnace; The AOD stove can utilize the steel underwater be blown into the oxygen of both amounts of knowing can be with steel in carbon accurately control to any contents level, the control carbon content is 0.005% in the tolerance range of 0.08-0.50%; Can generally make primary slag and sulphur can be taken off to below 0.005% using lime, ferrosilicon (FeSi) and aluminium to make under alkaline reduction slag and the intensively stirred condition; Can under the condition of a large amount of Argons, nitrogen content can be dropped in the 25-30ppm before the tapping, under normal tapping and pouring condition, the finished product nitrogen content can be controlled in the 50ppm; The AOD refining process can be removed hydrogen equally, and under normal pouring condition, hydrogen richness can be controlled in the 3-4ppm in the steel; Not only quickened desulfurization with FeSi, aluminium deoxidation and the stirring of intensive slag steel, and most deoxidation productss are absorbed by slag, the may command oxygen level is in 25ppm; Can have control action kou to the inclusion shape, be typical spherical being mingled with, and the grading of steel inclusion is quite satisfied.
Trimming and processing are again carried out in step 3:LF refining on the LF refining furnace.
The LF stove carries out microalloy to AOD stove purified molten steel, as: the accurate adjustment of titanium (Ti), boron compositions such as (B), accuracy control over temperature, the control of inclusion.
Step 4:VD refining is finished vacuum outgas on the VD stove.
The VD stove further reduces gas content hydrogen [H]≤1.5ppm, nitrogen [N]≤50ppm, oxygen [O]≤8ppm in the steel by vacuum system, promotes the quality of steel.
Step 5: continuous casting is being transported to the continuous caster top casting with above-mentioned molten steel after refining.
Different according to breed structure and specification of quality, AOD stove molten steel after refining both can directly go up the continuous caster cast, also can be transported to LF and/or VD stove and carry out going up continuous caster again after the refining of higher category and pour into a mould.
This method be applicable to produce steel interalloy element total amount≤10% in, the medium and low alloy special steel kind.
The AOD method is the abbreviation of argon-oxygen-decarburization process (Argon Oxygen Decarburization), it is to the oxygen blown while of molten steel under barometric point, be blown into rare gas element, as: argon (Ar), nitrogen (N2), by reducing carbon monoxide pressure of tension (Pco), to realize the important method of refining of decarburization and cr yield purpose.
Technology in the AOD furnace refining comprises oxygen decarburization and intensification, carries out restoring operation subsequently so that deoxidation of molten steel and desulfurization.After the sampling total analysis, before tapping, carry out the fine setting of alloying constituent.Its intensification, alloying, decarburization, degas, deoxidation and desulfurization operations all carry out in a container.
AOD stove main characteristics is:
1) requires lowlyer for starting material, can utilize cheap raw material (as high carbon ferro-chrome etc.) to produce the high-quality steel, reduce the production process cost greatly.
2) fast in high-carbon regions blowing speed, the dynamic conditions of reaction is superior.
3) equipment is simple, easy to operate, and initial cost and maintenance cost are low, remarkable in economical benefits.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (5)
1, in a kind of, the production method of medium and low alloy special steel, it is characterized in that, may further comprise the steps:
A, electrosmelting, the molten iron that in electric furnace blast furnace is transported adds the part steel scrap, melts and dephosphorization;
B, argon oxygen decarburizing furnace refining, the molten steel that electric furnace is transported carries out oxidation, reduction step, and this oxidation, reduction step comprise decarburization, desulfurization, denitrogenation, dehydrogenation and deoxidation;
C, continuous casting are transported to the continuous caster top casting with the argon oxygen decarburizing furnace molten steel after refining.
2, in according to claim 1, the production method of medium and low alloy special steel, it is characterized in that between argon oxygen decarburizing furnace refining and continuous casting, this method further comprises ladle furnace refining, on ladle furnace, carry out trimming and handle again.
3, in according to claim 2, the production method of medium and low alloy special steel, it is characterized in that behind the ladle furnace refining, this method further comprises the vacuum degassing furnace refining, is transported to the continuous caster top casting after finishing vacuum outgas on the vacuum degassing furnace.
4, according in described in the claim 2, the production method of medium and low alloy special steel, it is characterized in that, on ladle furnace, carry out trimming and the step handled again in employed microalloy be titanium, boron.
5, in according to claim 1, the production method of medium and low alloy special steel, it is characterized in that the steel scrap amount that adds is for smaller or equal to 20% of weight ratio in steps A.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810119937A CN101671762A (en) | 2008-09-11 | 2008-09-11 | Production method for medium and low alloy special steel |
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| CN200810119937A CN101671762A (en) | 2008-09-11 | 2008-09-11 | Production method for medium and low alloy special steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103642976A (en) * | 2013-11-22 | 2014-03-19 | 中原特钢股份有限公司 | H13 steel smelting process |
| CN104878320A (en) * | 2015-06-15 | 2015-09-02 | 三明市毅君机械铸造有限公司 | High-strength casting of mobile crushing station for mines and buildings and production process of high-strength casting |
| CN105648303A (en) * | 2016-03-02 | 2016-06-08 | 南京理工大学 | Method for improving degree of sphericity of stainless steel powder prepared through atomization method |
| CN111455131A (en) * | 2020-05-29 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting and continuous casting method of high-cleanliness wear-resistant steel |
-
2008
- 2008-09-11 CN CN200810119937A patent/CN101671762A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 王运丽等: "冶炼高强度低合金钢的AOD法", 《钢铁译文》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103642976A (en) * | 2013-11-22 | 2014-03-19 | 中原特钢股份有限公司 | H13 steel smelting process |
| CN103642976B (en) * | 2013-11-22 | 2015-08-19 | 中原特钢股份有限公司 | A kind of smelting technology of H13 steel |
| CN104878320A (en) * | 2015-06-15 | 2015-09-02 | 三明市毅君机械铸造有限公司 | High-strength casting of mobile crushing station for mines and buildings and production process of high-strength casting |
| CN105648303A (en) * | 2016-03-02 | 2016-06-08 | 南京理工大学 | Method for improving degree of sphericity of stainless steel powder prepared through atomization method |
| CN111455131A (en) * | 2020-05-29 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting and continuous casting method of high-cleanliness wear-resistant steel |
| CN111455131B (en) * | 2020-05-29 | 2021-11-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting and continuous casting method of high-cleanliness wear-resistant steel |
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Assignee: Suzhou Suxin Special Steel Co., Ltd. Assignor: Beijing Square Group Co., Ltd.|Jiangsu Su Steel Group Co., Ltd. Contract record no.: 2011110000001 Denomination of invention: Production method for medium and low alloy special steel License type: Exclusive License Open date: 20100317 Record date: 20110110 |
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Application publication date: 20100317 |