CN103184312A - Molten steel composite deoxidation method good for improving pouring - Google Patents
Molten steel composite deoxidation method good for improving pouring Download PDFInfo
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- CN103184312A CN103184312A CN2012103461119A CN201210346111A CN103184312A CN 103184312 A CN103184312 A CN 103184312A CN 2012103461119 A CN2012103461119 A CN 2012103461119A CN 201210346111 A CN201210346111 A CN 201210346111A CN 103184312 A CN103184312 A CN 103184312A
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Abstract
The invention belongs to the category of metallurgy and steelmaking processes, and particularly relates to a molten steel composite deoxidation method good for improving pouring, which is applicable to smelting of gear steel, non-quenched and tempered steel and constructional steel as well as high-titanium solder wire series steel, wherein a silicon barium alloy is fed into the deep part of molten steel through a core-spun yarn to complete the composite deoxidation of the molten steel, a core wire in the core-spun yarn comprises the components of 48%-58% of silicon, 25%-32% of barium and the balance of iron according to weight percentage. The method has the advantages that the deoxidation effect of the molten steel is enhanced and the consumption of an aluminum alloy in the deoxidation of the molten steel is reduced through the regulation of alloy elements; meanwhile, the purity of molten steel and the quality of the molten steel are remarkably improved, an occluded foreign substance in the molten steel is effectively promoted to be gathered and float upwards to the slag, the smoothness of multi-furnace sequence casting production is guaranteed, the cleanliness of the molten steel is increased, the smoothness of the continuous casting is guaranteed, the number of furnaces for sequence casting in continuous casting is improved, a continuous casting water gap is prevented from being blocked, and the consumption of deoxidation aluminum is reduced.
Description
Technical field
The invention belongs to metallurgical process for making class, be specifically related to a kind of method that is beneficial to the molten steel complex deoxidization that improves cast.
Background technology
Adopt the composition characteristic of Pinion Steel, non-hardened and tempered steel and the structure iron steel series of electric furnace and ladle refining (LF), vacuum outgas (VD) and the production of bloom continuous casting flow process, the content of sulphur and aluminium is all than higher in the first molten steel composition, and particularly the steel grade of S 〉=0.045% is in the majority; It two is that steel inclusion is had strict control requirement, in order to can pour into a mould smoothly at casting process, the situation that causes connecting watering property difference because this type of steel grade is easy to generate the casting process nozzle clogging in actual production, cause unusual whole watering and the cast of single stove, make production direct motion and steel quality all be affected.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art, a kind of method that is beneficial to the molten steel complex deoxidization that improves cast is provided, this method is in the liquid steel refining process, and feeding Si-Ba alloy cored-wire is realized molten steel is carried out effective control of deep deoxidation and inclusion.
The object of the invention realizes being finished by following technical scheme:
A kind of method that is beneficial to the molten steel complex deoxidization that improves cast, be used for the smelting of Pinion Steel, non-hardened and tempered steel and structure iron and high titanium welding wire steel series, it is characterized in that, this method adopts cored-wire that Si-Ba alloy is fed the molten steel depths, finish the complex deoxidization of molten steel, the shared weight percent of each component in the heart yearn of described cored-wire be respectively for: silicon 48%-58%, barium 25%-32%, surplus is iron.
Also contain the calcium that weight percent is 1%-3% in the described heart yearn.
Also contain the aluminium that weight percent is 1.5-2.5% in the described heart yearn.
The granularity of each component is 0.1-3mm in the described heart yearn.
Described cored-wire diameter is 9-16mm.
Advantage of the present invention is: the deoxidation of molten steel effect is strengthened in the adjustment by alloying element, reduces the consumption of deoxidation of molten steel aluminium alloy; Can significantly improve simultaneously the molten steel purity and improve the molten steel quality, and effectively impel inclusion in the molten steel to assemble and float to slag, also be conducive to guarantee sequence casting produces smoothly; Improved the molten steel cleanliness factor, guaranteed that the direct motion of continuous casting process, the company of improving continuous casting water the stove number, prevent the consumption that continous casting sprue stops up, saves deoxidized aluminium.
Embodiment
Adopt electric furnace-LF-VD-continuous casting process production Pinion Steel, non-hardened and tempered steel and structure iron and high titanium welding wire steel series that the casting performance of molten steel is had relatively high expectations, require the cleanliness factor height of molten steel, inclusion morphology wherein, composition, distribution of sizes etc. meet the demands, and need carry out deep deoxidation and carry out Control and Inclusion Removal molten steel.
Following examples provide a kind of polycomponent composite core-spun yarns such as silicon barium that carry out deep deoxidation at Pinion Steel, non-hardened and tempered steel and structure iron and high titanium welding wire steel series, wherein the shared weight percent of each component of heart yearn is respectively: silicon 48%-58%, barium 25%-32%, calcium 1%-3%, aluminium 1.5-2.5%, surplus is iron.
Below four specific embodiments, it adopts the composite core-spun yarn of four assembly sides respectively, at refining process feeding molten steel, to molten steel deep deoxidation and Control and Inclusion Removal, wherein the specification of cored-wire is φ 9mm-φ 16mm, be used for liquid steel refining process deep deoxidation and Control and Inclusion Removal, its add-on is controlled to be 2-5kg/t.s.
Shown in the table specific as follows:
At the result among above-mentioned four embodiment, the contriver has carried out relevant simultaneous test, at first contrast is, whether adopt the cored-wire mode to add, the result is, the heart yearn set of dispense ratio that adopts the present invention to limit is better than heart yearn component briquetting is directly added for the deoxidation effect that adopts the deoxidation of cored-wire mode to produce, and following table is depicted as the effect that above-mentioned four embodiment briquettings directly add:
Adopt method of the present invention that the molten steel deep deoxidation is handled, can further reduce the oxygen activity in the steel, improve the recovery rate of aluminium, reduce aluminium consumption, effectively control aluminium and decrease; Can also form duplex impurity, make inclusion modification, be tiny, even, disperse distribution, improve the cleanliness factor of molten steel, eliminate the appearance that point-like is mingled with, environment is had no adverse effects, therefore the Electric furnace steel making factory that produces Pinion Steel, non-hardened and tempered steel and structure iron and high titanium welding wire steel series is all had application value.
Secondly add mode for same employing cored-wire, if the component of heart yearn exceeds above-described embodiment scope, then do not reach the ideal technology effect, particularly connect and water all remarkable variation of stove number and point-like inclusion index.Shown in the table specific as follows:
Component silicon in the cored-wire that relates in above-described embodiment mainly is to make deoxidation of molten steel to form SiO
2Product, this type oxide can form complex inclusion with other deoxidation products and be easy to remove, this type impurity is relatively little to the harm of steel, its content control is in the purpose of 48%-58%, too high silicone content is unfavorable for the deep deoxidation of molten steel, for example embodiment 5, because the deoxidizing capacity of silicon is limited, low excessively silicone content then is difficult to form enough SiO
2Product and influence the generation of complex inclusion, for example embodiment 6; Component barium wherein mainly is to make the molten steel deep deoxidation, can give full play to the strong advantage of its deoxidizing capacity, further reduce the oxygen activity in the molten steel, the deoxidation products that forms is easy to come-up and removes in molten steel, also can form the complex deoxidization product, reduce the fusing point of deoxidation products, form liquid deoxidation products and be easy to separate with molten steel, the deoxidation efficient of too high certainly barium content influence molten steel, because its molecular weight is big, the amount that consumes of being combined with oxygen is many, and is also unfavorable to the control of cost, cross the effect that low barium content does not then reach deep deoxidation, therefore select OK range extremely important to it.
Also be in order to make the molten steel deep deoxidation for the calcium in the component, form the CaO product, with the Al in the molten steel
2O
3Form low-melting aluminium calciate complex deoxidization product, reduce the steel inclusion total amount, certainly because the characteristics of the low melting point of calcium, easy gasification, addition control for it is particularly strict, and too high calcium contents can make deoxygenation too fierce and cause the molten steel boiling, and the vapour pressure of calcium is very high, be easy to volatilization loss under the high temperature, be unfavorable for bringing into play its deoxidation efficient, the CaO product amount that low excessively calcium contents then forms can't form complex inclusion very little.Content control for adding aluminium then repeats no more, and is well known to those skilled in the art.
Control for the granularity of each component in the heart yearn mainly is in order to improve reaction efficiency, meticulous pulvis makes reaction too fierce, and molten steel boiling aggravation is easy to secondary oxidation, cross then reacting dynamics condition relative mistake of thick granularity, also be unfavorable for the processing of cored-wire in addition.
Above-mentioned for each set of dispense of heart yearn than and the selection of granularity, all are the requirements according to its steel grade characteristic, and each component makes up mutually, and back characteristic coupling draws.
Claims (5)
1. one kind is beneficial to the method for improving the molten steel complex deoxidization of pouring into a mould, be used for the smelting of Pinion Steel, non-hardened and tempered steel and structure iron and high titanium welding wire steel series, it is characterized in that, this method adopts the mode of cored-wire that Si-Ba alloy is fed the molten steel depths, finish the complex deoxidization of molten steel, the shared weight percent of each component in the heart yearn of described cored-wire be respectively for: silicon 48%-58%, barium 25%-32%, surplus is iron.
2. a kind of method that is beneficial to the molten steel complex deoxidization that improves cast according to claim 1 is characterized in that, also contains the calcium that weight percent is 1%-3% in the described heart yearn.
3. a kind of method that is beneficial to the molten steel complex deoxidization that improves cast according to claim 1 is characterized in that, also contains the aluminium that weight percent is 1.5-2.5% in the described heart yearn.
4. according to claim 1,2 or 3 described a kind of methods that are beneficial to the molten steel complex deoxidization that improves cast, it is characterized in that the granularity of each component is 0.1-3mm in the described heart yearn.
5. a kind of method that is beneficial to the molten steel complex deoxidization that improves cast according to claim 1 is characterized in that described cored-wire diameter is 9-16mm.
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| CN2012103461119A CN103184312A (en) | 2012-09-18 | 2012-09-18 | Molten steel composite deoxidation method good for improving pouring |
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| CN2012103461119A CN103184312A (en) | 2012-09-18 | 2012-09-18 | Molten steel composite deoxidation method good for improving pouring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104152631A (en) * | 2014-08-19 | 2014-11-19 | 马鞍山中科冶金材料科技有限公司 | Material for molten steel deoxidation and microalloying and preparation method and application method thereof |
| CN110643785A (en) * | 2019-01-25 | 2020-01-03 | 广东韶钢松山股份有限公司 | Refining deoxidation method of low-carbon low-silicon welding wire steel |
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| CN1363692A (en) * | 2001-01-10 | 2002-08-14 | 张海军 | Composite Si-Ca-Ba-Mg deoxidizing agent and its preparing process |
| CN101476019A (en) * | 2009-02-03 | 2009-07-08 | 陈丽萍 | Micro-aluminium silicon-barium-calcium-magnesium composite alloy |
| CN101935738A (en) * | 2010-06-01 | 2011-01-05 | 山西太钢不锈钢股份有限公司 | Method for feeding silico-calcium core-spun yarn |
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| CN1363692A (en) * | 2001-01-10 | 2002-08-14 | 张海军 | Composite Si-Ca-Ba-Mg deoxidizing agent and its preparing process |
| CN101476019A (en) * | 2009-02-03 | 2009-07-08 | 陈丽萍 | Micro-aluminium silicon-barium-calcium-magnesium composite alloy |
| CN101935738A (en) * | 2010-06-01 | 2011-01-05 | 山西太钢不锈钢股份有限公司 | Method for feeding silico-calcium core-spun yarn |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104152631A (en) * | 2014-08-19 | 2014-11-19 | 马鞍山中科冶金材料科技有限公司 | Material for molten steel deoxidation and microalloying and preparation method and application method thereof |
| CN104152631B (en) * | 2014-08-19 | 2016-01-27 | 马鞍山中科冶金材料科技有限公司 | A kind of material for deoxidation of molten steel, microalloying and preparation method and application method |
| CN110643785A (en) * | 2019-01-25 | 2020-01-03 | 广东韶钢松山股份有限公司 | Refining deoxidation method of low-carbon low-silicon welding wire steel |
| CN110643785B (en) * | 2019-01-25 | 2021-06-25 | 广东韶钢松山股份有限公司 | Refining deoxidation method of low-carbon low-silicon welding wire steel |
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Application publication date: 20130703 |