CN104073593B - A kind of core-spun yarn and the titanium alloyed method of molten steel - Google Patents
A kind of core-spun yarn and the titanium alloyed method of molten steel Download PDFInfo
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- CN104073593B CN104073593B CN201410299983.3A CN201410299983A CN104073593B CN 104073593 B CN104073593 B CN 104073593B CN 201410299983 A CN201410299983 A CN 201410299983A CN 104073593 B CN104073593 B CN 104073593B
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Abstract
The invention discloses a kind of core-spun yarn and to the titanium alloyed method of molten steel, this core-spun yarn comprises the skin of sandwich layer and the described sandwich layer of parcel, the silica flour of the ferro-titanium that wherein, described sandwich layer contains 50-99 % by weight, the aluminium powder of 0.1-50 % by weight and 0.1-30 % by weight. In the situation that ensureing that molten steel has the grading of lower field trash, core-spun yarn of the present invention no matter be used in LF or in RH refining to molten steel Ti Alloying, all make the recovery rate of titanium can reach more than 75%.
Description
Technical field
The present invention relates to a kind of core-spun yarn and use this core-spun yarn to carry out the titanium alloyed method of molten steel.
Background technology
Titanium is the strong deoxidier in steel, and it can make the dense internal organization of steel, crystal grain thinning power, and can fallThe aging sensitivity of low steel and cold brittleness, thus the welding performance of steel improved. In steelmaking process,Titanium can effectively improve continuous casting billet plasticity, in the time producing tube blank steel, crack-sensitivity steel grade, often adds certainAmount titanium is to avoid the defect of product.
At present, producer is directly ferro-titanium to be joined to steel with block-shape morphology to the Ti Alloying of steel mostlyLiquid is realized, but the method makes the rate of recovery of titanium lower, causes the loss of alloy. Generally, LFThe recovery rate that adds titanium after ferrotianium adds the recovery rate of titanium after ferrotianium less than 75% less than 70%, RH refining.
CN202401117U discloses a kind of core-spun yarn, and the sandwich layer of this core-spun yarn is titanium silicon layer,Between this titanium silicon layer and sheetmetal layer, be enclosed with successively from inside to outside mesh-supported layer and alloy of vanadium nitrideLayer. By this core-spun yarn feeding molten steel depths, can make that the rate of recovery of titanium is stable is controlled at 75% by feeding wire machineAbove, can also carry out to molten steel the alloying of vanadium simultaneously.
CN101260486A discloses a kind of low nitrogen, low-aluminum ferrotitanium and manufacture method and core-spun yarn, instituteState low nitrogen, low-aluminum ferrotitanium is 70Fe-Ti alloy, wherein contains nitrogen, aluminium, silicon, carbon, p and s etc. assortedPrime element. The sandwich layer of disclosed core-spun yarn is made up of this low nitrogen, low-aluminum ferrotitanium, wraps up described sandwich layerShell is made up of steel band. This core-spun yarn can directly feed in molten steel through the top of the slag, and the loss amount of sandwich layer is less,Make ferro-titanium utilization rate than the height of ferrotianium piece.
As can be seen here, when steel is carried out to the alloying of titanium, adopt the core-spun yarn that contains ferro-titanium compared with ferrotianiumPiece has higher titanium recovery rate. But, as the ferro-titanium of sandwich layer enter in molten steel, still exist meltableThe defect of separating and being oxidized, so the recovery rate of titanium needs further to be improved.
Summary of the invention
The object of the invention is to solve in prior art after molten steel Ti Alloying, titanium recovery rate is lowerDefect, thus a kind of core-spun yarn and a kind of to the titanium alloyed method of molten steel is provided.
According to a first aspect of the invention, the invention provides a kind of core-spun yarn, this core-spun yarn comprises sandwich layerWith the skin of the described sandwich layer of parcel, wherein, ferro-titanium, 0.1-50 that described sandwich layer contains 50-99 % by weightThe silica flour of the aluminium powder of % by weight and 0.1-30 % by weight.
According to a second aspect of the invention, the invention provides one to the titanium alloyed method of molten steel,The method comprises: before LF departures or before RH departures, first the molten steel in ladle is carried out to BOTTOM ARGON BLOWINGGas, makes the diameter of the molten steel face that the ladle top of the slag is exposed be not more than 30 centimetres, then by described exposedMolten steel in ladle, feed core-spun yarn of the present invention.
In the situation that ensureing that molten steel has lower field trash grading, no matter core-spun yarn of the present invention is used inLF or in RH refining to molten steel Ti Alloying, all make the recovery rate of titanium can reach more than 75%.
Other features and advantages of the present invention are described in detail the detailed description of the invention part subsequently.
Brief description of the drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, withDetailed description of the invention one is below used from explanation the present invention, but is not construed as limiting the invention. ?In accompanying drawing:
Fig. 1 is the cross section view of core-spun yarn of the present invention.
Description of reference numerals
1 sandwich layer 2 skins
Detailed description of the invention
Below the specific embodiment of the present invention is elaborated. Should be understood that, retouch in this placeThe detailed description of the invention of stating only, for description and interpretation the present invention, is not limited to the present invention.
As shown in Figure 1, the invention provides a kind of core-spun yarn, this core-spun yarn comprises: sandwich layer 1 and parcelThe skin 2 of described sandwich layer 1, wherein, described sandwich layer 1 contains ferro-titanium, aluminium powder and silica flour.
Ferro-titanium in described core-spun yarn is for molten steel being carried out to the alloying of titanium, in order to ensure titanium alloyThe quality of the molten steel after change, in preferred described ferro-titanium, the content of titanium is 60-80 % by weight, the containing of ironAmount is 20-40 % by weight.
The angle being easy to get from raw material, described ferro-titanium is 70 ferrotianiums more preferably, that is, and instituteState in ferro-titanium, the content of titanium is 65-75 % by weight, and the content of iron is 25-35 % by weight.
According to core-spun yarn of the present invention, thereby in order to prevent that the titanium in described ferro-titanium is oxidized shadow by molten steelRing the serviceability to described ferro-titanium, in described sandwich layer, also contain aluminium powder and silica flour.
Particularly, the aluminium powder of the ferro-titanium of 50-99 % by weight, 0.1-50 % by weight and 0.1-30 % by weightSilica flour.
According to core-spun yarn of the present invention, ferro-titanium, 5-25 that preferred described sandwich layer contains 65-90 % by weightThe silica flour of the aluminium powder of % by weight and 1-15 % by weight, can not only make molten steel have receiving of higher titanium like thisRate, can also further improve the cleannes of described molten steel.
In the present invention, described ferro-titanium, aluminium powder and silica flour are the metal smelt auxiliary material of this area routine,Therefore, all can contain inevitable impurity. Due to inevitable impurity phase containing key componentMeasure very littlely, ignore at this.
According to core-spun yarn of the present invention, fuse into fast in molten steel for the ease of the sandwich layer in described core-spun yarn,Also be convenient to the making of the sandwich layer of core-spun yarn, simultaneously in order to improve the recovery rate of titanium, preferred described ferro-titaniumExist with powder form.
According to one embodiment of the present invention, the particle diameter of described ferro-titanium, aluminium powder and silica flour is all preferredFor 1-3 millimeter.
According to core-spun yarn of the present invention, described skin can be sheetmetal. Preferably, described skin is served as reasons lowThe sheetmetal that carbon steel is made, so that described skin has higher fusing point, can further avoid bag like thisOuterly after heart yearn feeding molten steel melt too fast and affect the serviceability of described ferro-titanium. Outside preferred describedThe thickness of layer is 2-5 millimeter.
Outer field thickness described according to the present invention, preferred described mild steel is low-carbon cold rolling band steel.
The diameter of described core-spun yarn can be selected according to the requirement of wire feeder, according to the present invention, preferablyThe diameter of core-spun yarn is 10-20 millimeter.
Can be 100-300 gram/meter according to the line of core-spun yarn of the present invention is heavy.
The core-spun yarn with aforementioned component of the present invention all can be realized object of the present invention, and its preparation method canSelect for the routine of this area, for example, can carry out as follows:
First ferro-titanium is made to powder through jaw crusher, twin-roll machine fragmentation and screening successively, thenMix with aluminium powder, silica flour, form core powder, re-use sheetmetal (thereby forming skin of the present invention)Wrap up this core powder, finally use die finish to roll real and finishing to become to have the cylindrical wire of certain size, that is,To core-spun yarn.
It is a kind of to the titanium alloyed method of molten steel that the present invention also provides, and the method comprises: set off at LFBefore front or RH sets off, first the molten steel in ladle is carried out to argon bottom-blowing, make the ladle top of the slag exposedThe diameter of molten steel face is not more than 30 centimetres, then feeds in ladle by described exposed molten steelThe core-spun yarn of stating.
The diameter of the molten steel face that usually, the described ladle top of the slag is exposed is the diameter of core-spun yarn to be fed10-20 doubly.
Described molten steel can be the molten steel before LF refining departures, can be also RH application of vacuum departuresMolten steel before. Usually, the temperature of the molten steel before LF departures or before RH refining departures canThink 1500-1650 DEG C, this temperature is enough to melt core-spun yarn of the present invention. In order further to improve titaniumRecovery rate, the temperature of the molten steel before LF refining departures or before RH application of vacuum departures is preferably1580-1620℃
Due to provided by the invention, the main improvement of the titanium alloyed method of molten steel is before LF departuresOr before RH departures, the molten steel face exposed by the ladle top of the slag adds core-spun yarn of the present invention, therefore to steelLF refining or the vacuum treated concrete steps of RH all can carry out with reference to prior art, the present invention existsThis repeats no more.
According to the present invention, in the time that the diameter of the exposed molten steel face of the ladle top of the slag is greater than 30 centimetres, described steelThe oxidation of liquid can cause the distribution of core-spun yarn center core layer and the variation of chemical composition of feeding, causes the receipts of titaniumYield reduces.
According to the present invention, can be by two-wire feeding wire machine with single line or two-wire system to described in feeding in molten steelCore-spun yarn.
According to the present invention, with respect to the molten steel of 100-150 ton, the speed that feeds described core-spun yarn is preferably2-4 meter per second, can further avoid described in described core-spun yarn the molten steel of molten steel face oxidation or twisted in like thisOn molten steel face.
More preferably, with respect to the molten steel of 100-150 ton, the speed that feeds described core-spun yarn is 2.8-3.2Meter per second.
In the present invention, with respect to the molten steel of 100-150 ton, the feeding length of described core-spun yarn can be500-1500 rice.
For the sandwich layer in described core-spun yarn can be evenly distributed in described molten steel, simultaneously for fear of instituteState the oxidation of molten steel, feed after described core-spun yarn, described method preferably also comprises: argon flow amount is reducedTo making the fine motion of the ladle top of the slag but not exposed molten steel face, and to keep the time of described fine motion be 5-10 minute.
More preferably, the time that keeps described fine motion is 6-8 minute, can make described steel so on the one handLiquid carries out Ti Alloying fully, can further avoid on the other hand described titanium and become fractal in molten steelBecome field trash.
Below in conjunction with detailed description of the invention, the present invention is further described, but can not therefore limit the present inventionScope.
In following examples and comparative example, ferro-titanium is to originate from 70 of Panzhihua Steel City Group Co., Ltd.Ferrotianium; Before preparing core-spun yarn, by 70 ferrotianiums successively and sieve broken through jaw crusher, twin-roll machineOperation break-down is made the ferro-titanium powder of 1-3 millimeter, and the particle diameter of aluminium powder and silica flour is 1-3 millimeter. LFOr the steel grade of RH stove vacuum refining is pinion steel 20CrMnTi.
The recovery rate of titanium is by measuring the forward and backward Ti content of molten steel feeding core-spun yarn, then combination feedingTotal titanium amount in core-spun yarn, by calculating, is specially: titanium recovery rate=(molten steel feeding core-spun yarnAfter Ti content-molten steel feeding core-spun yarn before Ti content) total titanium amount in × tap/feeding core-spun yarn.
Use the oxygen content in LECOTC-600 oxygen-nitrogen analyzer tested steel; According to GB/T10561-2005Method evaluation steel in field trash grading.
Embodiment 1-5
Embodiment 1-5 is used for illustrating core-spun yarn of the present invention and preparation method thereof.
Embodiment 1-5 makes respectively core-spun yarn A1-A5, and wherein, the preparation process of core-spun yarn A1-A5 is:Ferro-titanium powder is mixed with different mass ratioes from aluminium powder, silica flour, form core powder, re-useCold-strip steel (purchased from Pangang Group Panzhihua Steel Vanadium Co., Ltd., the trade mark DTLA) parcel that 2mm is thickThis core powder, rolling real and finishing with die finish, to become diameter be the cylindrical wire of 12mm, thereby make core-spun yarnA1-A5. Sandwich layer composition and the line of core-spun yarn A1-A5 are heavy as shown in table 1.
Comparative example 1-2
Adopt the preparation process of embodiment 1-5 to make core-spun yarn D1-D2, the sandwich layer group of core-spun yarn D1-D2One-tenth and line thereof are heavy as shown in table 1.
Table 1
Embodiment 6
The present embodiment is used for illustrating of the present invention to the titanium alloyed method of molten steel.
By the molten steel of 120 tons, before RH stove application of vacuum departures, (now the temperature of molten steel is 1592DEG C), ladle is carried out to argon bottom-blowing, making the molten steel face diameter that the ladle top of the slag is exposed is 20cm, by coredLine A1 feeds in ladle from exposed molten steel face with two-wire system by feeding wire machine. Wire-feeding velocity is3.0m/s, the length of line feeding is 1000m. After line feeding completes, argon flow amount is reduced, control to ladleTop of the slag fine motion and not exposed molten steel face, ensure top of the slag fine motion time 8min. RH departures steel sample is detected,T[O] be 0.0013% ,≤1.5 grades of each type impurity gradings, meet the requirement of pinion steel 20CrMnTi,The recovery rate of titanium reaches 78%.
Comparative example 4
Adopt the method identical with embodiment 6 to the steel of 120 tons before RH stove application of vacuum departuresLiquid (now the temperature of molten steel is 1590 DEG C) carries out Ti Alloying processing, and difference is to adopt coredLine D1 replaces the core-spun yarn A1 in embodiment 6. RH departures steel sample is detected to T[O] be 0.0021%,Each type impurity is graded≤2.5 grades, does not meet the T[O of pinion steel 20CrMnTi] and field trash requirement,The recovery rate of titanium is 71%.
Comparative example 5
Adopt the method identical with embodiment 6 to the steel of 120 tons before RH stove application of vacuum departuresLiquid (now the temperature of molten steel is 1590 DEG C) carries out Ti Alloying processing, and difference is to adopt coredLine D2 replaces the core-spun yarn A1 in embodiment 6. RH departures steel sample is detected to T[O] be 0.0021%,≤ 2.0 grades of each type impurity gradings, do not meet the T[O of pinion steel 20CrMnTi] requirement, the receiving of titaniumRate is 72%.
Comparative example 6
By the molten steel of 120 tons, before RH stove application of vacuum departures, (now the temperature of molten steel is 1595DEG C), ladle is carried out to argon bottom-blowing, making the molten steel face diameter that the ladle top of the slag is exposed is 50cm, by coredLine A1 feeds in ladle from exposed molten steel face with two-wire system by feeding wire machine. Wire-feeding velocity is3.0m/s, the length of line feeding is 1000m. After line feeding completes, argon flow amount is reduced, control to ladleTop of the slag fine motion and not exposed molten steel face, ensure top of the slag fine motion time 8min. RH departures steel sample is detected,T[O] be 0.0018% ,≤2.0 grades of each type impurity gradings, meet the requirement of pinion steel 20CrMnTi,The recovery rate of titanium is 71%.
Embodiment 7
The present embodiment is used for illustrating of the present invention to the titanium alloyed method of molten steel.
By the molten steel of 120 tons before LF stove refining treatment departures (now molten steel temperature is 1585 DEG C),Ladle is carried out to argon bottom-blowing, and making the molten steel face diameter that the ladle top of the slag is exposed is 30cm. By core-spun yarn A2With feeding wire machine with two-wire system in exposed molten steel face feeding ladle. Wire-feeding velocity is 3.2m/s, feedsThe length of line is 1000m. After line feeding completes, by argon flow amount reduce, control to the fine motion of the ladle top of the slag andNot exposed molten steel face, ensures top of the slag fine motion time 6min. LF departures steel sample is detected to T[O] be0.0014% ,≤1.5 grades of each type impurity gradings, meet the requirement of pinion steel 20CrMnTi, the receipts of titaniumYield reaches 78%.
Embodiment 8
The present embodiment is used for illustrating of the present invention to the titanium alloyed method of molten steel.
By the molten steel of 120 tons through LF stove process departures before (now the temperature of molten steel is 1596 DEG C),Ladle is carried out to argon bottom-blowing, and making the molten steel face diameter that the ladle top of the slag is exposed is 25cm, by core-spun yarn A3With feeding wire machine with two-wire system in exposed molten steel face feeding ladle. Wire-feeding velocity is 2.8m/s, feedsThe length of line is 1000m. After line feeding completes, by argon flow amount reduce, control to the fine motion of the ladle top of the slag andNot exposed molten steel face, ensures top of the slag fine motion time 8min. LF departures steel sample is detected to T[O] be0.0017% ,≤2.0 grades of each type impurity gradings, meet the requirement of pinion steel 20CrMnTi, the receipts of titaniumYield reaches 77%.
Embodiment 9
The present embodiment is used for illustrating of the present invention to the titanium alloyed method of molten steel.
Adopt the method identical with embodiment 6 to the steel of 120 tons before RH stove application of vacuum departuresLiquid (now the temperature of molten steel is 1582 DEG C) carries out Ti Alloying processing, and difference is to use core-spun yarnA4 replaces the core-spun yarn A1 in embodiment 6. RH departures steel sample is detected to T[O] be 0.0020%,≤ 2.0 grades of each type impurity gradings, meet the requirement of pinion steel 20CrMnTi, and the recovery rate of titanium is 75%.
Embodiment 10
The present embodiment is used for illustrating of the present invention to the titanium alloyed method of molten steel.
Adopt the method identical with embodiment 6 to the steel of 120 tons before RH stove application of vacuum departuresLiquid (now the temperature of molten steel is 1605 DEG C) carries out Ti Alloying processing, and difference is to use core-spun yarnA5 replaces the core-spun yarn A1 in embodiment 6. RH departures steel sample is detected to T[O] be 0.0019%,≤ 2.0 grades of each type impurity gradings, meet the requirement of pinion steel 20CrMnTi, and the recovery rate of titanium is 76%.
Can be found out by above embodiment and comparative example, before molten steel LF departures or RH departures, logicalCross and add core-spun yarn of the present invention and by controlling titanium alloyed technique, can make the recovery rate of titanium reachMore than 75%, and inclusion content in molten steel is less.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail, still, the present invention does not limitDetail in above-mentioned embodiment, within the scope of technical conceive of the present invention, can be to the present inventionTechnical scheme carry out multiple simple variant, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technology spy described in above-mentioned detailed description of the inventionLevy, in reconcilable situation, can combine by any suitable mode, for fear of needn'tThe repetition of wanting, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as itsWithout prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. to the titanium alloyed method of molten steel, the method comprises: before LF departures or RH set offBefore, first the molten steel in ladle is carried out to argon bottom-blowing, make the diameter of the molten steel face that the ladle top of the slag is exposedBe not more than 30 centimetres, then in ladle, feed core-spun yarn by described exposed molten steel;
Described core-spun yarn comprises the skin of sandwich layer and the described sandwich layer of parcel, and wherein, described sandwich layer contains 50-99The silica flour of the ferro-titanium of % by weight, the aluminium powder of 0.1-50 % by weight and 0.1-30 % by weight.
2. method according to claim 1, wherein, in described ferro-titanium, the content of titanium is60-80 % by weight, the content of iron is 20-40 % by weight.
3. method according to claim 1, wherein, described ferro-titanium is 70 ferrotianiums.
4. according to the method described in any one in claim 1-3, wherein, described ferro-titanium withPowder form exists; The particle diameter of described ferro-titanium, aluminium powder and silica flour is 1-3 millimeter.
5. according to the method described in any one in claim 1-3, wherein, described skin is served as reasons lowThe sheetmetal that carbon steel is made, described outer field thickness is 2-5 millimeter.
6. according to the method described in any one in claim 1-3, wherein, described core-spun yarn straightFootpath is 10-20 millimeter.
7. method according to claim 1, wherein, the molten steel face that the described ladle top of the slag is exposedDiameter be core-spun yarn to be fed diameter 10-20 doubly.
8. method according to claim 1, wherein, with respect to the molten steel of 100-150 ton, feedsThe speed that enters described core-spun yarn is 2-4 meter per second.
9. method according to claim 8, wherein, with respect to the molten steel of 100-150 ton, feedsThe speed that enters described core-spun yarn is 2.8-3.2 meter per second.
10. method according to claim 1, wherein, feeds after described core-spun yarn described methodAlso comprise, argon flow amount is reduced to and makes the fine motion of the ladle top of the slag but not exposed molten steel face, and keep described micro-Moving time 5-10 minute.
11. methods according to claim 10, wherein, keep described fine motion time 6-8 minute.
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| CN111349751A (en) * | 2020-04-29 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reducing grade of A-type inclusions of low-titanium steel |
| CN111455132A (en) * | 2020-04-29 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reducing grade of A-type inclusions of titanium-containing steel |
| CN111455133A (en) * | 2020-04-30 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Application method of titanium-containing titanium dioxide steel core wire |
| CN111349752A (en) * | 2020-04-30 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Application method of titanium dioxide steel core wire |
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| CN1804079A (en) * | 2006-01-24 | 2006-07-19 | 上海崇明冶金材料厂 | Low-nitrogen ferrotitanium, its manufacturing method and cored wire |
| CN101260486A (en) * | 2007-03-06 | 2008-09-10 | 上海崇明冶金材料厂 | Low-nitrogen low-aluminum ferrotitanium, manufacturing method thereof and core-spun yarn |
| CN102465229A (en) * | 2010-11-13 | 2012-05-23 | 山西太钢不锈钢股份有限公司 | Ferro-titanium alloying method for titaniferous stainless steel |
| CN202369603U (en) * | 2011-12-07 | 2012-08-08 | 上海马腾新型材料厂 | Low nitrogen titanium iron core-spun yarn |
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| CN1804079A (en) * | 2006-01-24 | 2006-07-19 | 上海崇明冶金材料厂 | Low-nitrogen ferrotitanium, its manufacturing method and cored wire |
| CN101260486A (en) * | 2007-03-06 | 2008-09-10 | 上海崇明冶金材料厂 | Low-nitrogen low-aluminum ferrotitanium, manufacturing method thereof and core-spun yarn |
| CN102465229A (en) * | 2010-11-13 | 2012-05-23 | 山西太钢不锈钢股份有限公司 | Ferro-titanium alloying method for titaniferous stainless steel |
| CN202369603U (en) * | 2011-12-07 | 2012-08-08 | 上海马腾新型材料厂 | Low nitrogen titanium iron core-spun yarn |
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