CN202090014U - Solid-core passivated pure calcium core-spun yarn - Google Patents
Solid-core passivated pure calcium core-spun yarn Download PDFInfo
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- CN202090014U CN202090014U CN2011201634824U CN201120163482U CN202090014U CN 202090014 U CN202090014 U CN 202090014U CN 2011201634824 U CN2011201634824 U CN 2011201634824U CN 201120163482 U CN201120163482 U CN 201120163482U CN 202090014 U CN202090014 U CN 202090014U
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Abstract
A solid-core passivated pure calcium core-spun yarn belongs to the field of outer refining of a steel refining furnace, in particular to a pure calcium core-spun yarn for liquid steel calcium treatment. The solid-core passivated pure calcium core-spun yarn is formed in the way that a steel strip wraps a passivated calcium line, and is characterized in that a calcium passivated layer which is subject to passivated processing of calcium and is uniformly and continuous arranged on the surface of the calcium line is arranged between the steel strip and the metal calcium line, the diameter phi of the passivated calcium line is 7-8mm, and the steel strip is a cold-rolled high-quality low-carbon steel strip, and the thickness of the steel strip is 0.42-0.64mm. The utility model has the advantages that the content of silicon and other impurities can not be increased in the liquid steel, therefore, the quality of the liquid steel can be remarkably improved; calcium has minimum specific surface area, and the oxidation degree is reduced to minimum, therefore, the phenomenon of powder leakage can be avoided, and the loss of the calcium can be reduced; the rigidity of the calcium is improved, so that the calcium can penetrates deep into the liquid steel; after the surface of the metal calcium line is subject to passivation, the gasification speed of the metal calcium can be delayed, therefore, the condition that the overturning phenomenon is caused on the surface of steel slag when the line is fed can be remarkably reduced, the yield of the calcium can be remarkably improved, and the expense for calcium treatment can be reduced.
Description
Technical field
The utility model belongs to the steel-making furnace outer refining technology, relates in particular to the pure calcium core-spun yarn of molten steel calcium processing.
Background technology
It is with calcium metal or calcium alloy that the calcium of molten steel is handled, and adds the molten steel depths, fully under the situation of deoxidation, makes the further desulfurization of molten steel at molten steel, the furnace outer refining technology that oxide inclusion and sulfide inclusion are carried out sex change.
Since calcium metal fusing point low (850 ℃), boiling point low (1483 ℃), density low (in the time of 20 ℃, being 1.55g/cm3).Therefore float to the slag surface on adding behind the molten steel very easily, by the oxygen scaling loss in air and the slag; Under the external refining temperature, be higher than the boiling point of calcium in addition, the calcium vapour pressure is also bigger: in the time of 1600 ℃, Pca=1.83 * 105Pa(also is 1.83 normal atmosphere).So calcium or calcium alloy must add the molten steel depths, utilize the static pressure of molten metal to add that normal atmosphere makes the vapour pressure of its total pressure greater than calcium, to prevent calcium steam effusion molten steel face, prevent that slag liquid level fierceness from seething, improve the recovery rate of calcium.Past, the recovery rate of calcium was lower with throw-in play, plunging and the powder injection process of calcium and calcium alloy adding molten steel depths.Statistic data shows, common calcium alloy throw-in play, and the recovery rate of calcium is 1%～5%, and the recovery rate of plunging calcium is 3%～7%, and the recovery rate about 6%～10% of powder injection process calcium now all is eliminated.Method commonly used at present is that calcium or calcium alloy are wrapped in steel band inside, makes " cored-wire ", with above-mentioned " cored-wire " feeding molten steel depths, the recovery rate of calcium is significantly improved with feeding wire machine.
The calcic of existing several types or the cored-wire of calcium alloy still have following defective: siliceous low calcium alloy cored-wire, and for example CaSi cored-wire, BaCaSi cored-wire, its shortcoming is that molten steel increases silicon in the external refining process.Therefore be not suitable for low Si steel grade; Do not contain silico-calcium grain or abrasive grit mixture cored-wire, FeCa cored-wire for example, its defective is, because granulated metal calcium specific surface area is big, calcium metal is easily oxidized, cored-wire leaks powder in addition, easily causes the loss of calcium in the cored-wire.The calcareous weight percentage of FeCa cored-wire is 30%, places after one month, and the content percentage ratio of calcium can be reduced to 26%～27%.In addition, the cored-wire rigidity that above-mentioned two kinds of pulvis are core is relatively poor, and softening under action of high temperature behind the feeding ladle, therefore under higher wire-feeding velocity, cored-wire can't penetrate molten steel and enter the depths, and core also has defectives such as pulvis skewness.For above-mentioned reasons, the recovery rate of its calcium metal is generally 10%～18%.
On 01 12nd, 2011 disclosed " a kind of cored-wire and manufacture method thereof " cored-wires (CN101942542A) of China Intellectual Property Office are to be made of nexine core material and exoperidium, and exoperidium is formed by the steel band winding, and the nexine core material is real core metal calcium line.Defective is that any processing is not done on the calcium metal surface, and the surface is oxidation very easily, and in addition, under refining temperature, after exoperidium fusing, exposed calcium metal gasifies fast, easily causes slag liquid level fierceness to seethe and splash, and reduces the recovery rate of calcium.
China Intellectual Property Office's on December 22nd, 2010 disclosed " a kind of real core metal calcium core-spun yarn that is used for deoxidation in steel making " cored-wire (CN101921893A), be by skin parcel middle layer, middle parcel inner core is formed, described middle layer is machine oil or rapeseed oil, and expectation can reduce the gasification rate of calcium metal.Defective is that machine oil or rapeseed oil are liquid state, inhomogeneous in the calcium line surface arrangement under action of gravity, anti-oxidation effect is limited, and the gasification to calcium does not have retarding action, so under refining temperature, after the exoperidium fusing, calcium metal is still gasified fast, the slag liquid level is prone to the phenomenon that fierceness is seethed and splashed during line feeding, and the recovery rate of calcium also only is 15%～25%.
Summary of the invention
In order to overcome the defective that prior art exists, the purpose of this utility model provides a kind of pure calcium core-spun yarn of real core passivation and manufacture method thereof, prevent the calcium metal surface oxidation, improve the recovery rate of calcium, delay the gasification of calcium metal, reduce the gasification rate of calcium metal, what the slag liquid level occurred when reducing line feeding seethes and splash phenomena.
The pure calcium core-spun yarn of real core passivation, form by steel band winding metal calcium line, be characterized between described steel band and the metal calcium line, establish through the Passivation Treatment of calcium, on the calcium line surface even successive calcium passivation layer, prevent the loss of calcium surface oxidation effectively, delayed gasification rate.
Described calcium metal linear diameter Ф 7-8mm.
Described steel band is cold rolling high-quality mild-carbon steel strip, thickness 0.42-0.64mm.
Compared with prior art, advantage is:
1. compare with siliceous low calcium alloy cored-wire, do not make molten steel increase silicon and other impurity, significantly improve the molten steel quality;
2. compare with the pulverulent material cored-wire, as CaSi, FeCa cored-wire, calcium has minimum specific surface area, and degree of oxidation can be reduced to minimum; Avoid cored-wire " leakage powder " phenomenon, reduce the loss of calcium metal; The cored-wire rigidity improves can penetrate the molten steel depths at a high speed;
3. compare with pure metal calcium core-spun yarn, calcium metal oiling cored-wire, prevent the calcium metal surface oxidation; Delay the gasification rate of calcium metal, slag liquid level fierceness is seethed the generation with splash phenomena when significantly reducing line feeding, helps safety in production;
4. the recovery rate of calcium significantly improves, and average recovery rate reaches 20-30%, reduces the consumption per ton of steel of calcium, has both improved the molten steel quality, reduces the calcium processing costs again, helps producing.
Description of drawings
The utility model is described in further detail for the contrast accompanying drawing below.
Fig. 1 is the pure calcium core-spun yarn structural representation of real core passivation.
Embodiment
The pure calcium core-spun yarn steel band 1 tight winding metal calcium line 3 of real as seen from Figure 1 core passivation, the passivation layer 2 of calcium line is cemented on the metal calcium line surface equably.
Embodiment 1: adopt calcium line diameter Ф 7.6 ± 1mm, and thickness of strips 0.42mm, cored-wire external diameter Ф 9 ± 0.5mm, every meter calcium line weight 70 ± 3g, every meter steel band weight 137 ± 6g, calcium line and steel band weight ratio are 3:7, calcium line calcium content 〉=96 ± 1%.The wire-feeding velocity of pressing among table 1 embodiment 1 feeds cored-wire of the present utility model in the ladle molten steel, its calcium metal recovery rate data are listed in the table 1.
Embodiment 2: with the method for embodiment 1.Wire-feeding velocity by embodiment in the table 12 feeds cored-wire of the present utility model to the ladle molten steel, and its calcium metal recovery rate data are listed in the table 1.
Embodiment 3: with the method for embodiment 1.Wire-feeding velocity by embodiment in the table 13 feeds cored-wire of the present utility model to the ladle molten steel, and its calcium metal recovery rate data are listed in the table 1.
Embodiment 4: with the method for embodiment 1.Wire-feeding velocity by embodiment in the table 14 feeds cored-wire of the present utility model to the ladle molten steel, and its calcium metal recovery rate data are listed in the table 1.
As can be seen from the above table, the wire-feeding velocity of the pure calcium core-spun yarn of real core passivation is limited by the ladleful size.Ladleful is big more, and the molten steel degree of depth is just big more, and wire-feeding velocity can improve.Wire-feeding velocity is high more.Calcium more melts the depths fully at molten steel, and the recovery rate of corresponding calcium improves.The recovery rate of calcium is 22.5-30.2% among the embodiment, recovery rate than the pure calcium line calcium of real core that does not have passivation, improve five percentage points, avoided the pure calcium core-spun yarn of real core in the line feeding process, to produce the phenomenon that ladle slag fierceness is seethed and splashed in addition in an embodiment substantially.
Claims (4)
1. the pure calcium core-spun yarn of real core passivation is made of steel band winding metal calcium line, it is characterized in that establishing between described steel band and the metal calcium line through the Passivation Treatment of calcium, on the calcium line surface even successive calcium passivation layer.
2. the pure calcium core-spun yarn of real core passivation according to claim 1 is characterized in that described calcium metal linear diameter Φ 7-8mm.
3. the pure calcium core-spun yarn of real core passivation according to claim 1 is characterized in that described steel band is cold rolling high-quality mild-carbon steel strip, thickness 0.42-0.64mm.
4. the pure calcium core-spun yarn of real core passivation according to claim 1 is characterized in that every meter calcium line weight 70 ± 3g, every meter steel band weight 137 ± 6g, and calcium line and steel band weight ratio are 3:7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011201634824U CN202090014U (en) | 2011-05-21 | 2011-05-21 | Solid-core passivated pure calcium core-spun yarn |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011201634824U CN202090014U (en) | 2011-05-21 | 2011-05-21 | Solid-core passivated pure calcium core-spun yarn |
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| CN202090014U true CN202090014U (en) | 2011-12-28 |
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| CN2011201634824U Expired - Fee Related CN202090014U (en) | 2011-05-21 | 2011-05-21 | Solid-core passivated pure calcium core-spun yarn |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074467A (en) * | 2013-02-01 | 2013-05-01 | 浙江宝信新型炉料科技发展有限公司 | Solid metal magnesium alloy core-spun yarn for steelmaking desulfuration and manufacture method of solid metal magnesium alloy core-spun yarn |
| CN103451366A (en) * | 2012-09-10 | 2013-12-18 | 上海盛宝冶金科技有限公司 | Calcium adding method for deoxidation calcium treatment of liquid steel |
| CN106636541A (en) * | 2016-09-30 | 2017-05-10 | 秦皇岛首秦金属材料有限公司 | Technology for processing steel liquid calcium by adopting hard high-purity calcium wire |
-
2011
- 2011-05-21 CN CN2011201634824U patent/CN202090014U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451366A (en) * | 2012-09-10 | 2013-12-18 | 上海盛宝冶金科技有限公司 | Calcium adding method for deoxidation calcium treatment of liquid steel |
| CN103451366B (en) * | 2012-09-10 | 2016-04-13 | 上海盛宝冶金科技有限公司 | A kind ofly add calcium method for steel liquid deoxidation Calcium treatment |
| CN103074467A (en) * | 2013-02-01 | 2013-05-01 | 浙江宝信新型炉料科技发展有限公司 | Solid metal magnesium alloy core-spun yarn for steelmaking desulfuration and manufacture method of solid metal magnesium alloy core-spun yarn |
| CN103074467B (en) * | 2013-02-01 | 2015-12-23 | 浙江宝信新型炉料科技发展有限公司 | A kind of solid metal Mg alloy cored wine for steel desulfurization and preparation method thereof |
| CN106636541A (en) * | 2016-09-30 | 2017-05-10 | 秦皇岛首秦金属材料有限公司 | Technology for processing steel liquid calcium by adopting hard high-purity calcium wire |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Huang Zhiyong Inventor after: Yan Genfa Inventor after: Xu Guangzhi Inventor before: Huang Zhiyong Inventor before: Yan Genfa Inventor before: Xu Guangzhi Inventor before: Chen Xiang Inventor before: Zheng Daiqun Inventor before: Wu Shenghua Inventor before: Yang Jianguo Inventor before: Su Changyong Inventor before: Yi Tingfeng |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: HUANG ZHIYONG YAN GENFA XU GUANGZHI CHEN XIANG ZHENG YIQUN WU SHENGHUA YANG JIANGUO SU CHANGYONG YI TINGFENG TO: HUANG ZHIYONG YAN GENFA XU GUANGZHI |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20150521 |
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| EXPY | Termination of patent right or utility model |