CN101139643A - Silicon-calcium-magnesium-ferrous alloy used as steel-making deoxidizer - Google Patents
Silicon-calcium-magnesium-ferrous alloy used as steel-making deoxidizer Download PDFInfo
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- CN101139643A CN101139643A CNA2007101663261A CN200710166326A CN101139643A CN 101139643 A CN101139643 A CN 101139643A CN A2007101663261 A CNA2007101663261 A CN A2007101663261A CN 200710166326 A CN200710166326 A CN 200710166326A CN 101139643 A CN101139643 A CN 101139643A
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Abstract
The invention provides a Si-Ca-Mg-Fe alloy for deoxidizing molten steel, which comprises Si 40-60%, Ca 10-15%, Mg 1-10% and Fe is more than or equal to 40%, the remainders are unavoidable foreign matters. As the alloy contains more Fe, the specific weight is high, so the utilization rate of deoxidizing element is improved; and as the alloy contains Mg, the desulfurizing and deoxidizing capability is improved. The alloy can finally deoxidize molten steel so that the T[O] of molten steel can be steadily less than 20 ppm.
Description
Technical field
The present invention relates to a kind of iron alloy, in particular as the silicon-calcium-magnesium-iron alloy of steel making deoxidant.
Background technology
Along with progress of science and technology, society has higher requirement to the quality of steel in each field, and the purity of steel itself has very big influence to its mechanical property, especially during the too high oxygen level in the steel, can have a strong impact on the comprehensive mechanical performance of steel, therefore one of vital task of steelmaker author is exactly the oxygen that removes as much as possible in the steel, and the reductor of selecting to be suitable for is the main consideration of steelmaker author to the deoxidation link.
Silicocalcium is the strong reductor of smelting iron and steel, the final deoxygenation when being mainly used in production high-quality steel, special steel.This reductor has good desoxydatoin, can be with the Control for Oxygen Content in the steel below 30ppm.It can the silico-calcium piece and the mode of silico-calcium cored-wire use, but it also has a lot of deficiencies:
(1) therefore the density of this alloy be difficult for sinking to the molten steel deep less than 2.5 gram/cubic centimetres.The steam of the Ca element that this alloy is contained forces down, easily oxidation, be easy to molten steel surface slag blanket in ferric oxide and the reaction of airborne oxygen, the result makes the recovery rate of Ca element only about 5%, this means that a large amount of Ca elements is bootlessly slatterned, do not reach good degree of depth deoxidation effect.Simultaneously, because of the smog that the burning of Ca element produces, make production environment worsen.
(2) can avoid above-mentioned drawback though adopt the method for silico-calcium cored-wire to add silicocalcium, make cored-wire, need silicocalcium is made powder, lose the part silicocalcium so inevitably.In addition, add the silicocalcium cored-wire in the molten steel and must use feeding wire machine equipment.Yet the in use normal broken string accident that easily takes place of this equipment causes molten steel to be scrapped because of failing to improve deoxidation.In addition, because because the complex manufacturing of cored-wire rises its cost.
Therefore, the steel-smelting technology worker expect a kind of new, than great, have good deoxidation, desulfidation, can reach the reductor of good degree of depth deoxidation effect, so that reach the purpose of the comprehensive mechanical performance of raising steel with its deoxidation.
Summary of the invention
The invention provides a kind of silicon-calcium-magnesium-iron alloy that is used for deoxidation of molten steel, it consists of (% weight is benchmark in the gross weight of this iron alloy, down with):
Si, 40-60%, Ca, 10-15%, Mg, 1-10%, Fe 〉=40%, surplus is unavoidable impurities.
This preferred composition that is used for the silicon-calcium-magnesium-iron alloy of deoxidation of molten steel is: Si, and 40-60%, Ca, 10-15%, Mg, 5-10%, Fe 〉=40%, surplus is unavoidable impurities.
In above-mentioned alloy, Si is basic deoxidant element, is lower than 40% as if its content, then the deoxidizing capacity deficiency of this alloy; And, make that then the proportion of this alloy is too small if its content is higher than 60%.Therefore its content is limited to 40-60%.
Ca is the strong deoxidant element in this alloy.When itself and above-mentioned Si one were used from deoxidation of molten steel, the synergy of the two can make their deoxidizing capacity further improve.Ca content is lower than 10%, the deoxidizing capacity deficiency of this alloy then, and its content is higher than 15%, though can improve the deoxidizing capacity of this alloy, the production cost of this alloy is raise.Therefore, according to taking all factors into consideration, the Ca content of this alloy is limited to 10-15%.
Mg is the very strong element of a kind of deoxidizing capacity, also has very strong desulfidation simultaneously.Deoxygenated alloy of the present invention contains Mg, in order that further promote deoxidation, the sweetening power of this alloy, not only assurance less than 20ppm, can improve the nonmetal inclusion form of steel with the oxygen level in its deoxidation Hou steel simultaneously, improves the comprehensive mechanical performance of steel.If Mg content is higher than 10%, then the proportion of this alloy can descend; And Mg content is lower than 1%, and then the desoxydatoin of this element is just not obvious, and therefore, the Mg content of alloy of the present invention is limited to 1-10%, is more preferably and is limited to 5-10%.
Though the Fe in the alloy of the present invention does not have deoxidizing capacity, it has the decisive role that improves this alloy proportion.If Fe content in this alloy is less than 40%, and then the proportion of this alloy is too small, and it can not sink to enough degree of depth by the molten steel of deoxidation, can not bring into play its due deoxidizing capacity.
Therefore, in deoxygenated alloy of the present invention, Fe is not dispensable, but for guaranteeing that this alloy has the important component of enough proportion, must guarantee that therefore its content greater than 40%, could guarantee that like this its proportion is greater than 4.5.
Deoxygenated alloy of the present invention can be with following method production: earlier with conventional ore deposit heat furnace method produce silicon-calcium alloy, then when coming out of the stove with MAGNESIUM METAL towards being fused in this liquid silicon-calcium alloy, can obtain deoxygenated alloy of the present invention.Also can be with the melting and make deoxygenated alloy of the present invention in induction furnace of the steel scrap of the commercially available silicon-calcium alloy, MAGNESIUM METAL and the cleaning that prepare by proportioning.
Deoxygenated alloy of the present invention has good deoxidizing capacity, and it can stably take off the total oxygen in the molten steel to 20ppm.In addition, this alloy also has certain sweetening power.Because the composition of this alloy is simple, thereby its production cost is lower, but also be convenient to produce.
Further specify the present invention below by embodiment.
Embodiment
Embodiment 1 preparation is as the silicon-calcium-magnesium-iron alloy of steel making deoxidant
Silicon-the calcium alloy of 700 kilograms of cleaning steel scraps, 110 kilograms of MAGNESIUM METAL, 800 kilograms of calcics 30%, silicon-iron of 800 kilograms siliceous 75% are added melting in the induction furnace.Fine melt Hou obtains 2380 kilograms of silicon-calcium-magnesium-iron alloys.The composition that the analysis showed that this alloy is:
Si，46.5％、Ca，10.34％、Mg，4.3％、Fe，42％。
The experiment of embodiment 2 high speed track steel-deoxidizings
Must be used for the 900A steel-deoxidizing in the alloy of embodiment 1, the experimental furnace number is 10 stoves, and every stove molten steel amount is 100 tons, and the consumption of this alloy is 80 a kilograms/stove.In deoxidation process, do not see the white smoke of calcium incendiary spark and calcium oxide on the liquid level in ladle.T[0 in the steel after the deoxidation] 10 stove mean values be 16.5PPm.
Comparative Examples 1
Make steel-deoxidizing with the condition identical, but the composition of the deoxygenated alloy that uses is: Si:56%, Ca:30%, Fe:12% with embodiment; Proportion 2.38g/cm
3
In deoxidation process, in ladle, see spark and smog that the calcium burning produces on the liquid level.Steel T[0 after the deoxidation] be (25) PPm.
Claims (2)
1. silicon-calcium-magnesium-iron alloy that is used for deoxidation of molten steel is a benchmark in the gross weight of this iron alloy, and its weight percent consists of: Si, and 40-60%, Ca, 10-15%, Mg, 1-10%, Fe 〉=40%, surplus is unavoidable impurities.
2. the weight percent that is used for the silicon-calcium-magnesium-iron alloy of deoxidation of molten steel as claimed in claim 1 consists of: Si, and 40-60%, Ca, 10-15%, Mg, 5-10%, Fe 〉=40%, surplus is unavoidable impurities.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101663261A CN101139643A (en) | 2007-11-06 | 2007-11-06 | Silicon-calcium-magnesium-ferrous alloy used as steel-making deoxidizer |
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| CNA2007101663261A CN101139643A (en) | 2007-11-06 | 2007-11-06 | Silicon-calcium-magnesium-ferrous alloy used as steel-making deoxidizer |
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| CN101139643A true CN101139643A (en) | 2008-03-12 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102888492A (en) * | 2012-10-10 | 2013-01-23 | 中国科学院金属研究所 | Si-Ca-Al-Mg-RE (rare earth) composite deoxidizer and preparation method thereof |
| CN112322905A (en) * | 2020-10-27 | 2021-02-05 | 河南中原特钢装备制造有限公司 | Rare earth deoxidizer for low-aluminum steel electroslag and preparation method thereof |
| CN113994015A (en) * | 2019-06-17 | 2022-01-28 | 杰富意钢铁株式会社 | Method for adding Ca to molten steel |
-
2007
- 2007-11-06 CN CNA2007101663261A patent/CN101139643A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102888492A (en) * | 2012-10-10 | 2013-01-23 | 中国科学院金属研究所 | Si-Ca-Al-Mg-RE (rare earth) composite deoxidizer and preparation method thereof |
| CN102888492B (en) * | 2012-10-10 | 2013-09-18 | 中国科学院金属研究所 | Si-Ca-Al-Mg-RE (rare earth) composite deoxidizer and preparation method thereof |
| CN113994015A (en) * | 2019-06-17 | 2022-01-28 | 杰富意钢铁株式会社 | Method for adding Ca to molten steel |
| CN112322905A (en) * | 2020-10-27 | 2021-02-05 | 河南中原特钢装备制造有限公司 | Rare earth deoxidizer for low-aluminum steel electroslag and preparation method thereof |
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