CN104073593A - Cored wire and method for titanium alloying of liquid steel - Google Patents
Cored wire and method for titanium alloying of liquid steel Download PDFInfo
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- CN104073593A CN104073593A CN201410299983.3A CN201410299983A CN104073593A CN 104073593 A CN104073593 A CN 104073593A CN 201410299983 A CN201410299983 A CN 201410299983A CN 104073593 A CN104073593 A CN 104073593A
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Abstract
The invention discloses a cored wire and a method for the titanium alloying of liquid steel. The cored wire comprises a core layer and an outer layer wrapping the core layer, wherein the core layer contains the ingredients in percentage by weight: 50-99wt% of ferrotitanium, 0.1-50wt% of aluminum powder and 0.1-30wt% of silicon powder. Regardless of whether the cored wire disclosed by the invention is applied to the titanium alloying of the liquid steel in an LF (Ladle Furnace) or RH (Ruhrstahl-Hereaeus) refining in the case that the condition that the liquid steel has a relatively low inclusion rating is guaranteed, the yield of titanium can reach over 75%.
Description
Technical field
The present invention relates to a kind of cored-wire and use this cored-wire to carry out the titanium alloyed method of molten steel.
Background technology
Titanium is the strong reductor in steel, and it can make the dense internal organization of steel, crystal grain thinning power, and can reduce aging sensitivity and the cold shortness of steel, thus improve the welding property of steel.In steelmaking process, titanium can effectively improve continuously cast bloom plasticity, in the time producing tube blank steel, crack-sensitivity steel grade, often adds a certain amount of titanium to avoid the defect of product.
At present, producer is directly ferro-titanium to be joined to molten steel with block-shape morphology to realize to the Ti Alloying of steel mostly, but the method makes the rate of recovery of titanium lower, causes the loss of alloy.Generally, the recovery rate that LF 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 cored-wire, and the sandwich layer of this cored-wire is titanium silicon layer, is enclosed with successively from inside to outside mesh-supported layer and alloy of vanadium nitride layer between this titanium silicon layer and sheetmetal layer.By this cored-wire feeding molten steel depths, stable being controlled at more than 75% of the rate of recovery of titanium can be made by feeding wire machine, the alloying of vanadium can also be carried out to molten steel simultaneously.
CN101260486A discloses a kind of low nitrogen, low-aluminum ferrotitanium and manufacture method and cored-wire, and described low nitrogen, low-aluminum ferrotitanium are 70Fe-Ti alloy, wherein contain the impurity elements such as nitrogen, aluminium, silicon, carbon, p and s.The sandwich layer of disclosed cored-wire is made up of this low nitrogen, low-aluminum ferrotitanium, wraps up the shell of described sandwich layer and is made up of steel band.This cored-wire can directly feed in molten steel through the top of the slag, and the loss amount of sandwich layer is less, makes ferro-titanium utilization ratio than the height of ferrotianium piece.
As can be seen here, when steel is carried out to the alloying of titanium, adopt the cored-wire that contains ferro-titanium to there is higher titanium recovery rate compared with ferrotianium piece.But, enter the defect that still has easy melting oxidation in molten steel as the ferro-titanium of sandwich layer, 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, the defect that titanium recovery rate is lower, thus a kind of cored-wire 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 cored-wire, this cored-wire comprises the skin of sandwich layer and the described sandwich layer of parcel, wherein, and the silica flour of the ferro-titanium that described sandwich layer contains 50-99 % by weight, the aluminium powder of 0.1-50 % by weight and 0.1-30 % by weight.
According to a second aspect of the invention, the invention provides a kind of 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 argon bottom-blowing, make the diameter of the molten steel face that the ladle top of the slag is exposed be not more than 30 centimetres, then in ladle, feed cored-wire of the present invention by described exposed molten steel.
In the situation that ensureing that molten steel has the grading of lower inclusion, cored-wire 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%.
Other features and advantages of the present invention are described in detail the embodiment 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 specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the cross section view of cored-wire of the present invention.
Description of reference numerals
1 sandwich layer 2 skins
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein 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 cored-wire, this cored-wire comprises: the skin 2 of sandwich layer 1 and the described sandwich layer 1 of parcel, wherein, described sandwich layer 1 contains ferro-titanium, aluminium powder and silica flour.
Ferro-titanium in described cored-wire is for carrying out the alloying of titanium to molten steel, in order to ensure the quality of the molten steel after Ti Alloying, in preferred described ferro-titanium, the content of titanium is 60-80 % by weight, and the content of iron 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, in described ferro-titanium, the content of titanium is 65-75 % by weight, and the content of iron is 25-35 % by weight.
According to cored-wire of the present invention, thereby in order to prevent that the titanium in described ferro-titanium is oxidized the use properties that has influence on described ferro-titanium by molten steel, also contain aluminium powder and silica flour in described sandwich layer.
Particularly, the aluminium powder of the ferro-titanium of 50-99 % by weight, 0.1-50 % by weight and the silica flour of 0.1-30 % by weight.
According to cored-wire of the present invention, the silica flour of the ferro-titanium that preferred described sandwich layer contains 65-90 % by weight, the aluminium powder of 5-25 % by weight and 1-15 % by weight, can not only make like this molten steel there is the recovery rate of higher titanium, can also further improve the degree of cleaning of described molten steel.
In the present invention, described ferro-titanium, aluminium powder and silica flour are the Metal smelting auxiliary material of this area routine, therefore, all can contain inevitable impurity.Because inevitably impurity phase is very little to the content of main ingredient, ignore at this.
According to cored-wire of the present invention, fuse into fast in molten steel for the ease of the sandwich layer in described cored-wire, be also convenient to the making of the sandwich layer of cored-wire, simultaneously in order to improve the recovery rate of titanium, preferred described ferro-titanium exists 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 preferably 1-3 millimeter.
According to cored-wire of the present invention, described skin can be sheetmetal.Preferably, described skin is the sheetmetal of being made up of soft steel, so that described skin has higher fusing point, can further avoid like this cored-wire to feed and outerly after molten steel melt too fast and affect the use properties of described ferro-titanium.Preferably described outer field thickness is 2-5 millimeter.
Outer field thickness described according to the present invention, preferred described soft steel is low-carbon cold rolling band steel.
The diameter of described cored-wire can be selected according to the requirement of wire feeder, and according to the present invention, preferably the diameter of cored-wire is 10-20 millimeter.
Can be 100-300 gram/meter according to the line of cored-wire of the present invention is heavy.
The cored-wire with aforementioned component of the present invention all can be realized object of the present invention, and its preparation method can be that the routine of this area is selected, for example, can carry out as follows:
First ferro-titanium is made to powder through jaw crusher, twin-roll machine fragmentation and screening successively, then mix with aluminium powder, silica flour, form core powder, re-use sheetmetal (thereby forming skin of the present invention) and wrap up this core powder, finally use die finish to roll real and finishing to become to have the cylindrical wire of certain size,, obtain cored-wire.
It is a kind of to the titanium alloyed method of molten steel that the present invention also provides, the method comprises: before LF departures or before RH departures, 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 exposed be not more than 30 centimetres, then in ladle, feed above-mentioned cored-wire by described exposed molten steel.
The diameter of the molten steel face that usually, the described ladle top of the slag is exposed be cored-wire to be fed diameter 10-20 doubly.
Described molten steel can be the molten steel before LF refining departures, can be also the molten steel before RH vacuum-treat departures.Usually, the temperature of the molten steel before LF departures or before RH refining departures can be 1500-1650 DEG C, and this temperature is enough to melt cored-wire of the present invention.In order further to improve the recovery rate of titanium, the temperature of the molten steel before LF refining departures or before RH vacuum-treat departures is preferably 1580-1620 DEG C
Due to provided by the invention, the main improvement of the titanium alloyed method of molten steel is before LF departures or before RH departures, the molten steel face exposed by the ladle top of the slag adds cored-wire of the present invention, therefore the LF refining to steel or the vacuum treated concrete steps of RH all can be carried out with reference to prior art, and the present invention does not repeat them here.
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, the oxidation of described molten steel can cause the distribution of cored-wire center core layer and the variation of chemical constitution of feeding, causes the recovery rate of titanium to reduce.
According to the present invention, can in molten steel, feed described cored-wire with single line or two-wire system by two-wire feeding wire machine.
According to the present invention, with respect to the molten steel of 100-150 ton, the speed that feeds described cored-wire is preferably 2-4 meter per second, can further avoid so described cored-wire by the oxidation of the molten steel of molten steel face or twist on described molten steel face.
More preferably, with respect to the molten steel of 100-150 ton, the speed that feeds described cored-wire is 2.8-3.2 meter per second.
In the present invention, with respect to the molten steel of 100-150 ton, the feeding length of described cored-wire can be 500-1500 rice.
For the sandwich layer in described cored-wire can be evenly distributed in described molten steel, while is for fear of the oxidation of described molten steel, feed after described cored-wire, described method preferably also comprises: 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 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 molten steel carry out fully Ti Alloying so on the one hand, can further avoid on the other hand the composition in described titanium and molten steel to form inclusion.
Below in conjunction with embodiment, the present invention is further described, but can not therefore limit the scope of the invention.
In following examples and comparative example, ferro-titanium is 70 ferrotianiums that originate from Panzhihua Steel City Group Co., Ltd.; Before preparing cored-wire, 70 ferrotianiums are made successively to the ferro-titanium powder of 1-3 millimeter through jaw crusher, twin-roll machine fragmentation and screening operation, the particle diameter of aluminium powder and silica flour is 1-3 millimeter.The steel grade of LF or the vacuum refinement of RH stove is Pinion Steel 20CrMnTi.
The recovery rate of titanium is by measuring the forward and backward titanium content of molten steel feeding cored-wire, again in conjunction with the total titanium amount in the cored-wire of feeding, by calculating, be specially: the total titanium amount in titanium recovery rate=(titanium content before the titanium content-molten steel feeding cored-wire after molten steel feeding cored-wire) × tap/feeding cored-wire.
Use the oxygen level in LECOTC-600 oxygen-nitrogen analyzer tested steel; According to the inclusion grading in the method evaluation steel of GB/T10561-2005.
Embodiment 1-5
Embodiment 1-5 is used for illustrating cored-wire of the present invention and preparation method thereof.
Embodiment 1-5 makes respectively cored-wire A1-A5, wherein, the preparation process of cored-wire A1-A5 is: ferro-titanium powder is mixed with different mass ratioes from aluminium powder, silica flour, form core powder, re-use cold rolled strip that 2mm is thick (purchased from Pangang Group Panzhihua Steel Vanadium Co., Ltd., trade mark DTLA) wrap up this core powder, rolling real and finishing with die finish, to become diameter be the cylindrical wire of 12mm, thereby make cored-wire A1-A5.Sandwich layer composition and the line of cored-wire A1-A5 are heavy as shown in table 1.
Comparative example 1-2
Adopt the preparation process of embodiment 1-5 to make cored-wire D1-D2, sandwich layer composition and the line thereof of cored-wire D1-D2 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 vacuum-treat departures (now the temperature of molten steel is 1592 DEG 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, and cored-wire A1 is fed in ladle from exposed molten steel face with two-wire system by feeding wire machine.Wire-feeding velocity is 3.0m/s, and the length of line feeding is 1000m.After line feeding completes, argon flow amount is reduced, control to the fine motion of the ladle top of the slag and not exposed molten steel face, ensure top of the slag fine motion time 8min.RH departures steel sample is detected to T[O] be 0.0013% ,≤1.5 grades of each type impurity gradings, meet the requirement of Pinion Steel 20CrMnTi, and the recovery rate of titanium reaches 78%.
Comparative example 4
Adopt the method identical with embodiment 6 to carry out Ti Alloying processing to the molten steel of 120 tons (now the temperature of molten steel is 1590 DEG C) before RH stove vacuum-treat departures, difference is to adopt cored-wire D1 to replace the cored-wire 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 inclusion requirement, the recovery rate of titanium is 71%.
Comparative example 5
Adopt the method identical with embodiment 6 to carry out Ti Alloying processing to the molten steel of 120 tons (now the temperature of molten steel is 1590 DEG C) before RH stove vacuum-treat departures, difference is to adopt cored-wire D2 to replace the cored-wire A1 in embodiment 6.RH departures steel sample is detected to T[O] be 0.0021%, each type impurity is graded≤2.0 grades, does not meet the T[O of Pinion Steel 20CrMnTi] requirement, the recovery rate of titanium is 72%.
Comparative example 6
By the molten steel of 120 tons before RH stove vacuum-treat departures (now the temperature of molten steel is 1595 DEG 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, and cored-wire A1 is fed in ladle from exposed molten steel face with two-wire system by feeding wire machine.Wire-feeding velocity is 3.0m/s, and the length of line feeding is 1000m.After line feeding completes, argon flow amount is reduced, control to the fine motion of the ladle top of the slag and not exposed molten steel face, ensure top of the slag fine motion time 8min.RH departures steel sample is detected to T[O] be 0.0018% ,≤2.0 grades of each type impurity gradings, meet the requirement of Pinion Steel 20CrMnTi, and 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.
The molten steel of 120 tons, before the departures of LF stove refining treatment (now molten steel temperature is 1585 DEG C), is carried out to argon bottom-blowing to ladle, and making the molten steel face diameter that the ladle top of the slag is exposed is 30cm.Cored-wire A2 is fed in ladle from exposed molten steel face with two-wire system by feeding wire machine.Wire-feeding velocity is 3.2m/s, and the length of line feeding is 1000m.After line feeding completes, argon flow amount is reduced, control to the fine motion of the ladle top of the slag and not exposed molten steel face, ensure top of the slag fine motion time 6min.LF departures steel sample is detected to T[O] be 0.0014% ,≤1.5 grades of each type impurity gradings, meet the requirement of Pinion Steel 20CrMnTi, and the recovery rate of titanium 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, making the molten steel face diameter that the ladle top of the slag is exposed is 25cm, and cored-wire A3 is fed in ladle from exposed molten steel face with two-wire system by feeding wire machine.Wire-feeding velocity is 2.8m/s, and the length of line feeding is 1000m.After line feeding completes, argon flow amount is reduced, control to the fine motion of the ladle top of the slag and not exposed molten steel face, ensure top of the slag fine motion time 8min.LF departures steel sample is detected to T[O] be 0.0017% ,≤2.0 grades of each type impurity gradings, meet the requirement of Pinion Steel 20CrMnTi, and the recovery rate of titanium 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 carry out Ti Alloying processing to the molten steel of 120 tons (now the temperature of molten steel is 1582 DEG C) before RH stove vacuum-treat departures, difference is, with the cored-wire A1 in cored-wire A4 replacement 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 carry out Ti Alloying processing to the molten steel of 120 tons (now the temperature of molten steel is 1605 DEG C) before RH stove vacuum-treat departures, difference is, with the cored-wire A1 in cored-wire A5 replacement 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, by adding cored-wire of the present invention and by controlling titanium alloyed technique, can making the recovery rate of titanium reach more 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; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a cored-wire, this cored-wire comprises the skin of sandwich layer and the described sandwich layer of parcel, wherein, the silica flour of the ferro-titanium that described sandwich layer contains 50-99 % by weight, the aluminium powder of 0.1-50 % by weight and 0.1-30 % by weight.
2. cored-wire according to claim 1, wherein, in described ferro-titanium, the content of titanium is 60-80 % by weight, the content of iron is 20-40 % by weight.
3. cored-wire according to claim 1, wherein, described ferro-titanium is 70 ferrotianiums.
4. according to the cored-wire described in any one in claim 1-3, wherein, described ferro-titanium exists with powder form; The particle diameter of described ferro-titanium, aluminium powder and silica flour is 1-3 millimeter.
5. according to the cored-wire described in any one in claim 1-4, wherein, described skin is the sheetmetal of being made up of soft steel, and described outer field thickness is 2-5 millimeter.
6. according to the cored-wire described in any one in claim 1-5, wherein, the diameter of described cored-wire is 10-20 millimeter.
7. one kind 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 argon bottom-blowing, make the diameter of the molten steel face that the ladle top of the slag is exposed be not more than 30 centimetres, then in ladle, feed the cored-wire described in any one in claim 1-6 by described exposed molten steel.
8. method according to claim 7, wherein, the diameter of the molten steel face that the described ladle top of the slag is exposed be cored-wire to be fed diameter 10-20 doubly.
9. method according to claim 7, wherein, with respect to the molten steel of 100-150 ton, the speed that feeds described cored-wire is 2-4 meter per second, is preferably 2.8-3.2 meter per second.
10. method according to claim 7, wherein, feeds after described cored-wire, and described method also comprises, 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 fine motion time 5-10 minute, is preferably 6-8 minute.
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| 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 |
| 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 |
| 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 |
| 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 |
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| CN104073593B (en) | 2016-05-04 |
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