CN102206732B - Solid-core passivated pure calcium cored wire and manufacturing method thereof - Google Patents
Solid-core passivated pure calcium cored wire and manufacturing method thereof Download PDFInfo
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- CN102206732B CN102206732B CN 201110132071 CN201110132071A CN102206732B CN 102206732 B CN102206732 B CN 102206732B CN 201110132071 CN201110132071 CN 201110132071 CN 201110132071 A CN201110132071 A CN 201110132071A CN 102206732 B CN102206732 B CN 102206732B
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Abstract
The invention discloses a solid-core passivated pure calcium cored wire and a manufacturing method thereof, belongs to secondary refining of a steel furnace, in particular relates to a pure calcium cored wire for calcium treatment of molten steel and a manufacturing method thereof. The cored wire consists of a steel strip coated and passivated calcium wire, and is characterized in that a calcium passivated layer which is subjected to calcium passivation treatment and is uniform and continuous on the surface of the calcium wire is arranged between a steel strip and a metal calcium wire. The passivated calcium wire has the diameter phi of 7-8mm; and the steel strip is a cold-rolled high-quality low-carbon steel strip and has the thickness of 0.42-0.64mm. The invention has the advantages that: by the cored wire, silicon and other impurities of the molten steel are not increased, and the quality of the molten steel is obviously improved; the calcium has the minimum specific surface area, the oxidation degree is reduced to the minimum, power leakage is avoided, and the loss of the calcium is reduced; the rigidity is improved, and the cored wire can enter the molten steel at a high speed; the metal calcium wire subjected to surface passivation can reduce the metal calcium gasifying speed, and obviously reduce a steel slag surface boiling phenomenon in the process of feeding the wire; and the calcium yield is obviously improved, and the calcium treatment cost is reduced.
Description
Technical field
The invention belongs to the steel-making furnace outer refining technology, relate in particular to molten steel calcium and handle with pure calcium core-spun yarn and manufacture method thereof.
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 ℃), and density is low (to be 1.55g/cm in the time of 20 ℃
3).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 ℃, and P
Ca=1.83 * 10
5Pa(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 its total pressure greater than the vapour pressure of 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 weight percentage of FeCa cored-wire calcic 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 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 invention is to provide 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,, the gasification rate of reduction 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, formed 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 continuous calcium passivation layer, prevent the loss of calcium surface oxidation effectively, delayed gasification rate; Calcium metal linear diameter Ф 7-8mm; Described steel band is cold rolling high-quality mild-carbon steel strip, thickness 0.42-0.64mm.
The present invention further improves, and described calcium passivating solution is composed of the following components in the ratio of weight of material: oxalic acid: boric acid: water=1:4:11.
The pure calcium core-spun yarn manufacture method of real core passivation, undertaken by following step:
1. the passivating solution of preparation calcium is under normal pressure, in oxalic acid: boric acid: water=1:4:11 ratio is prepared;
2. calcium line processed is made the metal calcium line with pure calcium ingot at twine machine;
3. processing is carried out comprehensively, smeared continuously to the passivation of metal calcium line with passivating solution to the calcium metal surface immediately in the twine machine exit;
4. leaving standstill is the key of passivation technology, and the metal calcium line leaves standstill 20-30min after smearing passivating solution;
5. the oven dry oven dry directly influences the quality of passivation, and drying temperature 120-150 ℃, dry time length 70-90min;
6. the metal calcium line after the cooling oven dry naturally cools to room temperature;
7. cored-wire processed is wrapped in the metal calcium line of passivation in the steel coil strip on cored-wire machine processed, makes cored-wire;
8. bundling, packing.
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, is conducive to 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, is conducive to produce.
Description of drawings
The invention will be further described for the contrast accompanying drawing below.
Fig. 1 is the pure calcium core-spun yarn structural representation of real core passivation.
Fig. 2 is the pure calcium core-spun yarn manufacturing process flow diagram of real core passivation.
Embodiment
The pure calcium core-spun yarn steel band 1 tight winding metal calcium line 3 of real core passivation as seen from Figure 1, the passivation layer 2 of calcium line is cemented on the metal calcium line surface equably.
As seen from Figure 2, the pure calcium core-spun yarn manufacturing process flow of real core passivation is as follows:
The preparation calcium passivating solution under normal pressure in oxalic acid: the ratio of boric acid: water=1:4:11 is prepared;
2. calcium line processed is made the metal calcium line through twine machine, diameter of phi 7-8 ± 1mm with 96 ± 1% purity calcium ingots;
3. metal calcium line Passivation Treatment is smeared the calcium line surface with passivating solution immediately in the twine machine exit comprehensively continuously;
4. leave standstill and leave standstill 20-30min after the metal calcium line is smeared passivating solution;
5. bake drying temperature 120-150 ℃, dry time length 70-90min;
6. the passivation calcium line of cooling oven dry naturally cools to room temperature;
7. cored-wire processed is wrapped in the metal calcium line of passivation in the steel coil strip on cored-wire machine processed, makes cored-wire;
8. bailing.
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 invention 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 invention 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 invention 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 invention 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 more big, and the molten steel degree of depth is just more big, and wire-feeding velocity can improve.Wire-feeding velocity is more high.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 ladle slag fierceness in addition in an embodiment substantially and seethed and the phenomenon of splashing.
Claims (1)
1. the pure calcium core-spun yarn manufacture method of real core passivation, the pure calcium core-spun yarn of described real core passivation is made of steel band winding metal calcium line, establish between steel band and the metal calcium line handle through the passivating solution of calcium, on the calcium line surface even continuous calcium passivation layer; Described calcium metal linear diameter Φ 7.6 ± 1mm, calcium line calcium content 〉=(96 ± 1) %; Described steel band is cold rolling high-quality mild-carbon steel strip, thickness 0.42mm; Cored-wire external diameter Φ 9 ± 0.5mm, every meter calcium line weight 70 ± 3g, every meter steel band weight 137 ± 6g; Specifically carry out according to the following steps:
(1) preparation calcium passivating solution under normal pressure by oxalic acid: the part by weight of boric acid: water=1:4:11 is prepared;
(2) calcium line processed is made the metal calcium line with pure calcium ingot at twine machine;
(3) passivation of metal calcium line in the twine machine exit immediately the passivating solution with calcium processing is smeared on metal calcium line surface comprehensively continuously;
(4) leave standstill: the metal calcium line leaves standstill 20-30min after smearing passivating solution;
(5) oven dry: drying temperature 120-150 ℃, dry time length 70-90min;
(6) cooling: the metal calcium line of oven dry naturally cools to room temperature;
(7) cored-wire processed is wrapped in the metal calcium line of passivation in the steel coil strip on cored-wire machine processed, makes cored-wire;
(8) bundling, packing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110132071 CN102206732B (en) | 2011-05-21 | 2011-05-21 | Solid-core passivated pure calcium cored wire and manufacturing method thereof |
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| CN 201110132071 CN102206732B (en) | 2011-05-21 | 2011-05-21 | Solid-core passivated pure calcium cored wire and manufacturing method thereof |
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| CN102206732B true CN102206732B (en) | 2013-08-28 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102424893B (en) * | 2011-10-14 | 2014-11-05 | 陈来祥 | Solid metal calcium-aluminum cored wire and preparation method thereof |
| CN102505064A (en) * | 2011-11-28 | 2012-06-20 | 秦皇岛双轮环保科技有限公司 | Method for producing calcium paste cored wires |
| CN102417950B (en) * | 2011-11-28 | 2014-04-02 | 巩义市众鑫钙业有限公司 | Seamless calcium line and preparation method thereof |
| CN102719609B (en) * | 2012-06-26 | 2014-06-25 | 巩义市众鑫钙业有限公司 | Seamless aluminum calcium iron wire and preparation method thereof |
| CN102808063A (en) * | 2012-08-31 | 2012-12-05 | 石晓峰 | Method for manufacturing calcium metal core-spun yarn of high purity |
| CN102851446A (en) * | 2012-09-10 | 2013-01-02 | 上海盛宝冶金科技有限公司 | Multilayer-structured calcium-core wire, and manufacturing method and purpose thereof |
| CN103278422B (en) * | 2013-06-14 | 2015-08-12 | 济钢集团有限公司 | Pure calcium core-spun yarn method for quickly detecting |
| CN105695662B (en) * | 2015-03-27 | 2017-06-30 | 马鞍山市兴达冶金新材料有限公司 | A kind of production method for being passivated pure calcium core-spun yarn |
| CN104711392B (en) * | 2015-03-27 | 2016-06-22 | 马鞍山市兴达冶金新材料有限公司 | A kind of production system being passivated pure calcium core-spun yarn |
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| CN1664124A (en) * | 2005-02-17 | 2005-09-07 | 包头翌新冶金技术有限公司 | Magnesium core spun yarn |
| CN100381586C (en) * | 2006-01-17 | 2008-04-16 | 沈阳东北大学冶金技术研究所 | Cored wire for deoxidation of molten steel |
| CN101942542A (en) * | 2010-08-24 | 2011-01-12 | 上海马腾新型材料厂 | Cored wire and manufacturing method thereof |
| CN201809392U (en) * | 2010-09-17 | 2011-04-27 | 马鞍山市江南钢业有限公司 | Pure calcium core-spun yarn for molten steel deoxidization |
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