CN103074462A - Deoxidation method used in converter steelmaking process - Google Patents
Deoxidation method used in converter steelmaking process Download PDFInfo
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- CN103074462A CN103074462A CN2013100397971A CN201310039797A CN103074462A CN 103074462 A CN103074462 A CN 103074462A CN 2013100397971 A CN2013100397971 A CN 2013100397971A CN 201310039797 A CN201310039797 A CN 201310039797A CN 103074462 A CN103074462 A CN 103074462A
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Abstract
The invention discloses a deoxidation method used in a converter steelmaking process. The deoxidation method comprises the following steps of: adding a compound deoxidant after 30 seconds of tapping, i.e. 1/4 of tapping, in a tapping process after the completion of bessemerizing; adding silicomanganese and silicoferrite for alloying in 10 seconds after the compound deoxidant is added; and after the completion of tapping, adding or not adding SiAlCaBa final deoxidant according to requirements of steel grades, or adding SiAlCaBa and the compound deoxidant to jointly serve as the final deoxidant, to complete the entire deoxidization treatment, wherein the compound deoxidant comprises the main components such as Ca, Si, C, P and S, and the amount of the added compound deoxidant is determined according to carbon content during tapping. According to the invention, by means of carrying out optimization specific to the amount of the deoxidant added in a steel product smelting process to control oxygen activity within a certain range, the quality of steelmaking products is guaranteed, meanwhile, the steelmaking process is not changed greatly, auxiliary equipment is not added, so that the production cost of steelmaking can be reduced greatly, the purposes of saving resources and optimizing the process are achieved, and the deoxidation method is suitable for steelmaking enterprises.
Description
Technical field
The present invention relates to the smelting of steel, relate in particular to the interpolation reductor and go deimpurity method.
Background technology
Development in science and technology is constantly updated the replacement with the steel Industrial products, thereby requires more and more stricter to steel product quality.This forces process for making and technology to be constantly updated and development, produces Clean Steel and ultra clean steel, with the quality that improves steel and the mechanical property of improving steel, satisfies the requirement of Industrial products.Past, in order constantly to improve deoxidation in steel making, desulfurization, dephosphorization and removal nonmetallic inclusionsin steel, scientific and technical personnel have adopted traditional reductor that molten steel is carried out deoxidation, but also at the continuous new reductor of research, No. 01127029.2, Chinese patent application part No. 00110156.0 " a kind of complex deoxidizer for steelmaking and preparation method thereof " " being used for the method for making of reductor of steelmaking process and the alkene soil composite deoxidant of preparation thereof " for example, number 01122913.6 " composite deoxidizing alloy for smelting steel ", number 200510073137.0 " preparation method of a kind of manganese series multi-element composite deoxidant for steel smelting and products thereof ", number 200610152055.X " composite alloy that is used for deoxidation in steel making and microalloying ", number 200810004338.9 " aluminum-containing ferroalloy that is used for deoxidation in steel making ", number 201110190484.7 " a kind of composite deoxidant that in steel-making, uses and using method thereof ", number 201210132072.2 " a kind of steel-making pressing type composite deoxidant and preparation method thereof " etc.
Adopt the enterprise of top and bottom combined blown converter production technique, dissolve in excessive oxygen latter stage in the steel smelting, and excessive oxygen will separate out from molten steel when solidifying in steel gradually, can form inclusion and bubble, has a strong impact on performance, the outward appearance of slab quality, rolling rear product.For guaranteeing quality product, enterprise adopts Si-Al-Ca-Ba to carry out deoxidation of molten steel as deoxidation material in actual production process, but this reductor price is high, consumption is large, causes steel-making cost to increase.
Summary of the invention
The object of the present invention is to provide the method for deoxidation in a kind of convertor steelmaking process, is to adopt the NEW TYPE OF COMPOSITE reductor as pre-deoxidant, with economize on resources, Optimization Technology, reduction cost.
The contriver draws and adopts a kind of composite deoxidant as pre-deoxidant after deliberation, adopts SiAlCaBa or SiAlCaBa and this composite deoxidant jointly as the technical process of end-deoxidizer when needing; In convertor steelmaking process, different steel grades are carried out different adding modes under different condition, and oxygen activity all can satisfy the control requirement in the resulting steel, and slab quality is guaranteed.
Therefore the method for deoxidation in the steelmaking process that provides of contriver, be bessemerize finish after in the tapping process, namely tapping in 30 seconds in tapping added composite deoxidant to 1/4 o'clock; Add composite deoxidant and add silicomanganese, ferro-silicon in the time of 10 seconds; After the tapping, add or do not add SiAlCaBa end-deoxidizer or adding SiAlCaBa and this composite deoxidant jointly as end-deoxidizer according to the steel grade needs fully, finish whole deoxidation treatment; Described composite deoxidant main component is: Ca35%～50%, Si20%～40%, C＞20%, P＜0.05%, S＜0.05%, and the amount of described adding pre-deoxidant and end-deoxidizer adds according to tapping carbon content according to the form below:
In the aforesaid method, the composite deoxidant of adding is the commercially available prod, and each steel grade building material product oxygen activity span of control is after adding: to HPB235, and oxygen activity≤70ppm; To HRB335, oxygen activity≤50ppm; To HRB400, oxygen activity≤70ppm.
The inventive method is optimized for reductor add-on in the steel product smelting process, oxygen activity in the steel is controlled at certain scope, guarantee the quality of steel-making product, simultaneously the steel-making smelting technology is not done large change, do not increase utility appliance, can significantly reduce the STEELMAKING PRODUCTION cost, reach economize on resources, the purpose of Optimization Technology, be suitable for popularizing at metallurgy industry.
Embodiment
Embodiment
Shoudu Iron and Steel Co waterside town steel enterprise company limited steelworks used the method for deoxidation of technical scheme of the present invention in the steel smelting technology specific as follows in 2012:
One, used composite deoxidant physical and chemical index such as following table:
| Ca（%） | Si（%） | C（%） | P（%） | S（%） |
| 35～50 | 20～40 | ＞20 | ＜0.05 | ＜0.05 |
This composite deoxidant is that Guizhou Bo Hong company produces according to the Composition Control requirement of our company;
Two, adopting this composite deoxidant is according to different steel grade tapping carbon as the add-on of pre-deoxidant
Content and deciding, according to the form below adds:
Three, using method: bessemerize finish after in the tapping process, namely tapping in 30 seconds in tapping added composite deoxidant to 1/4 o'clock; Add composite deoxidant and add silicomanganese, ferro-silicon in the time of 10 seconds; After the tapping, add the SiAlCaBa end-deoxidizer according to the scheme regulation as required fully, finish whole deoxidation treatment; When using reductor, forbid directly to add the large bag bag end;
Four, each steel grade building material product oxygen activity control claimed range is as follows: to HPB235, and oxygen activity≤70ppm; To HRB335, oxygen activity≤50ppm; To HRB400, oxygen activity≤70ppm;
After employing the inventive method, the actual production oxygen activity of each steel grade building material product all reaches the control required value, and is as shown in the table:
| Steel grade | Maximum oxygen activity (ppm) | Minimum oxygen activity (ppm) | Averaged oxygen activity (ppm) |
| HPB235 | 65.5 | 43.6 | 55.2 |
| HRB335 | 46.8 | 36.6 | 38.3 |
| HRB400 | 26.5 | 18.6 | 23.5 |
Continuous casting billet quality sees the following form
By the contrast, adopt this composite deoxidant as pre-deoxidant, the technique of SiAlCaBa as end-deoxidizer after, index is basically identical under continuously cast bloom macroscopic examination subsurface bubble index and the former process condition.
Part heat performance sees the following form
As seen oxygen activity and strand subsurface bubble grade all satisfy related request.
The said firm and other iron and steel enterprise's reductor use difference to be the following aspects:
1, adopt the technology mode of pre-deoxidant and end-deoxidizer in the said firm's steel-making smelting process, decrease steel-making smelting cost, steel product cost per ton descends 5～6 yuan than in the past, and guarantees slab quality, meets national energy-saving and reduces discharging requirement;
2, established different steel grade to the add-on system of reductor, and carries out industrialization production according to the tapping carbon content.
Claims (2)
1. the method for deoxidation in the convertor steelmaking process, it is characterized in that bessemerize finish after in the tapping process, namely tapping in 30 seconds in tapping added composite deoxidant to 1/4 o'clock; Add that composite deoxidant added silicomanganese in the time of 10 seconds, ferrosilicon carries out alloy; After the tapping, add or do not add SiAlCaBa end-deoxidizer or adding SiAlCaBa and this composite deoxidant jointly as end-deoxidizer according to the steel grade needs fully, finish whole deoxidation treatment; Described composite deoxidant main component is: Ca35%～50%, Si20%～40%, C＞20%, P＜0.05%, S＜0.05%, and the amount of described adding pre-deoxidant and end-deoxidizer adds according to tapping carbon content according to the form below:
2. in accordance with the method for claim 1, the composite deoxidant that it is characterized in that described adding is the commercially available prod, and each steel grade building material product oxygen activity span of control is after adding: to HPB235, and oxygen activity≤70ppm; To HRB335, oxygen activity≤50ppm; To HRB400, oxygen activity≤70ppm.
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| CN2013100397971A CN103074462A (en) | 2013-02-01 | 2013-02-01 | Deoxidation method used in converter steelmaking process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962684A (en) * | 2015-07-03 | 2015-10-07 | 共享铸钢有限公司 | Deoxygenating method for molten steel smelting |
| CN105695664A (en) * | 2016-04-21 | 2016-06-22 | 日照宝华新材料有限公司 | Low-cost converter steelmaking deoxidization process |
| CN110343810A (en) * | 2019-07-04 | 2019-10-18 | 邯郸钢铁集团有限责任公司 | A kind of method of liquid steel pre-deoxidizing in converter tapping process |
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| CN1982489A (en) * | 2006-02-11 | 2007-06-20 | 湖南华菱涟源钢铁有限公司 | Production method of III-grade threaded steel bar |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962684A (en) * | 2015-07-03 | 2015-10-07 | 共享铸钢有限公司 | Deoxygenating method for molten steel smelting |
| CN105695664A (en) * | 2016-04-21 | 2016-06-22 | 日照宝华新材料有限公司 | Low-cost converter steelmaking deoxidization process |
| CN105695664B (en) * | 2016-04-21 | 2018-08-31 | 日照宝华新材料有限公司 | A kind of low cost pneumatic steelmaking deoxidization technique |
| CN110343810A (en) * | 2019-07-04 | 2019-10-18 | 邯郸钢铁集团有限责任公司 | A kind of method of liquid steel pre-deoxidizing in converter tapping process |
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Application publication date: 20130501 |