CN105296706A - Titanium composite cored wire, application thereof and method for conducting molten steel titanium alloying - Google Patents
Titanium composite cored wire, application thereof and method for conducting molten steel titanium alloying Download PDFInfo
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- CN105296706A CN105296706A CN201510856084.3A CN201510856084A CN105296706A CN 105296706 A CN105296706 A CN 105296706A CN 201510856084 A CN201510856084 A CN 201510856084A CN 105296706 A CN105296706 A CN 105296706A
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Abstract
The invention relates to the field of iron and steel smelting, in particular to a titanium composite cored wire, application thereof and a method for conducting molten steel titanium alloying by using the titanium composite cored wire. The cored wire comprises a core layer and an outer layer wrapping the core layer, wherein the core layer comprises, by weight, 45%-75% of titanium, 10%-30% of aluminum and 15%-25% of iron. The method includes the following steps that the cored wire is fed into molten steel, and conditions are controlled before wire feeding, so that the temperature of the molten steel is made to range from 1622 DEG C to 1625 DEG C, the oxygen activity of the molten steel is made to be smaller than or equal to 10 ppm, and the content of FeO and MnO in ladle slag is made to be smaller than or equal to 2.5wt%. The cored wire and the method are especially suitable for steel with the titanium content being 0.45wt%-0.6wt%, and the titanium yield can reach above 80%.
Description
Technical field
The present invention relates to field of iron and steel smelting, particularly, relate to a kind of titanium composite core-spun yarn and application thereof and use this titanium composite core-spun yarn to carry out the titanium alloyed method of molten steel.
Background technology
At the beginning of remembering previous generation, people just start to note the effect of titanium in ferrous materials.Result display according to the study, titanium is role in high-strength low-alloy structural steel, deep drawing steel, stainless steel, boron-containing steel, be because it and nitrogen, carbon, sulphur, oxygen have great avidity, generate more stable nitride, carbide, sulfide and oxide compound; And in the maraging steel, high strength thermal resistant alloy (as iron-based precipitation hardening type alloy) of superstrength, titanium is but generate intermetallic compound with other metals, play a part precipitation strength.
Add in steel titanium not only refinement crystal grain, improve intensity, and postwelding toughness, cold deformation, erosion resistance etc. to be all greatly improved.Given this, titanium microalloying also becomes the large developing direction of current microalloyed steel one.But titanium is very active element, just burn before titanium contacts with molten steel surface, produce scaling loss, generally, the scaling loss amount of titanium reaches more than 20%, and its recovery rate generally below 80% (LF), in addition, ferrotianium proportion comparatively molten steel is light, and the upper contact of titanium and molten steel is many, with lacking of lower contacts, therefore the effect of titanium and molten steel has uneven problem, if alloy mixing time is not enough, composition tolerances will be caused comparatively large, and this just brings disadvantageous effect to the Stability Control of end properties.
Therefore, the titanium composite core-spun yarn that exploitation is applicable to make steel has very important effect.
Summary of the invention
The object of the invention is to be to solve to after molten steel Ti Alloying in prior art, the defect that titanium recovery rate is lower, thus provide a kind of cored-wire and application and this cored-wire of use thereof to carry out the titanium alloyed method of molten steel.Cored-wire of the present invention and method are specially adapted to the steel grade that titanium content is 0.45-0.6 % by weight, and titanium recovery rate can reach more than 80%.
The invention provides a kind of cored-wire, this cored-wire comprises the skin of sandwich layer and the described sandwich layer of parcel, and wherein, described sandwich layer contains the iron of the titanium of 45-75 % by weight, the aluminium of 10-30 % by weight and 15-25 % by weight.
Present invention also offers above-mentioned cored-wire at production titanium content is the application in the steel grade of 0.45-0.6 % by weight.
Invention additionally provides a kind of to the titanium alloyed method of molten steel, the method comprises feed cored-wire of the present invention in molten steel, wherein, condition control is carried out before line feeding, make: the temperature of molten steel is 1622-1625 DEG C, oxygen activity≤the 10ppm of molten steel, content≤2.5 % by weight of FeO+MnO in ladle slag.
The present inventor finds, the cored-wire of prior art and method can not be applicable to the steel grade that titanium content is 0.45-0.6 % by weight well, be difficult to titanium content strictly be controlled in the scope of 0.45-0.6 % by weight, the present inventor obtains the cored-wire and production method that can be applicable to this type steel grade after large quantifier elimination, preferably titanium content can be controlled within the required range, and obtain higher titanium recovery rate, and the recovery of titanium is comparatively stable, Composition Control precision improves.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is 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 is outer
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of 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, and the iron of described sandwich layer 1 containing the titanium of 45-75 % by weight, the aluminium of 10-30 % by weight and 15-25 % by weight.In more preferred situation, described sandwich layer contains the iron of the titanium of 55-65 % by weight, the aluminium of 15-25 % by weight and 15-25 % by weight.
In the present invention, described titanium and iron preferably exist with the form of ferro-titanium, and described aluminium preferably exists with the form of aluminium powder.There is no particular limitation for the particle diameter of described ferro-titanium and described aluminium powder, and such as all meet≤3mm, and wherein the ratio of granularity≤0.5mm is not more than 15%, preferably, granularity is in the scope of 1-2.5mm.
In the present invention, described cored-wire can contain inevitable impurity, but due to inevitable impurity phase very little to the content of main ingredient, negligible.Content for S and P in impurity should be paid special attention to control, equal demand fulfillment≤0.01 % by weight.
According to cored-wire of the present invention, described skin can be sheetmetal.Preferably, described skin is the sheetmetal be made up of soft steel, to make described skin have higher fusing point, outerly after can avoiding that cored-wire is fed molten steel so further melts too fast and affects the use properties of described ferro-titanium.Preferred described outer field thickness is 3-4 millimeter.According to thickness outer field described in the present invention, preferred described soft steel is low-carbon cold rolling band steel.
In the present invention, the wire diameter of described cored-wire is preferably 10-14 millimeter, is preferably 12.5-14 millimeter.
In the present invention, the line of described cored-wire is heavy usual in the scope of 320-400g/m.
Cored-wire of the present invention is specially adapted to produce the steel grade that titanium content is 0.45-0.6 % by weight.
The cored-wire with aforementioned component of the present invention all can realize object of the present invention, and its preparation method can be that the routine of this area is selected, such as, can carry out as follows:
First ferro-titanium is made powder through jaw crusher, twin-roll machine fragmentation and screening successively, then mix with aluminium powder, form core powder, re-use sheetmetal (thus forming skin of the present invention) and wrap up this core powder, finally use die finish to roll real also finishing and become to have the cylindrical wire of certain size, that is, cored-wire is obtained.Other effective constituents, such as magnesium powder and/or silica flour can also be contained in cored-wire of the present invention.
Present invention also offers above-mentioned cored-wire at production titanium content is the application in the steel grade of 0.45-0.6 % by weight.
Invention additionally provides a kind of to the titanium alloyed method of molten steel, the method comprises feed cored-wire of the present invention in molten steel, wherein, condition control is carried out before line feeding, make: the temperature of molten steel is 1622-1625 DEG C, oxygen activity≤the 10ppm of molten steel, content≤2.5 % by weight of FeO+MnO in ladle slag
In the present invention, preferably, before line feeding, carry out condition control, make: the temperature of molten steel is 1622-1625 DEG C, the oxygen activity≤8ppm of molten steel, and in ladle slag, the content of FeO+MnO is 1-2 % by weight.
In the present invention, the speed of described line feeding can be 4.5-7m/s, is preferably 5-6m/s.
In the present invention, described method also comprises: do not allow after line feeding again to heat.
There is no particular limitation for the mode of described line feeding, according to the mode of this area routine, such as: before LF departures or before RH departures, first argon bottom-blowing is carried out to the molten steel in ladle, the diameter in the molten steel face making the ladle top of the slag exposed is not more than 30 centimetres, then in ladle, feeds above-mentioned cored-wire by described exposed molten steel.Usually, the diameter in the molten steel face that the described ladle top of the slag is exposed is 10-20 times of the diameter of cored-wire to be fed.After feeding described cored-wire, 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 the time of described fine motion to be 5-10 minute, be preferably 6-8 minute.
In the present invention, preferably, C content >=0.05 % by weight is controlled during converter terminal tapping.
Method of the present invention is specially adapted to produce the molten steel that the content of titanium is 0.45-0.6 % by weight, to obtain the steel grade of titanium content for 0.45-0.6 % by weight.
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, according to titanium content being controlled add cored-wire in the requirement of 0.45-0.6 % by weight.
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 after molten steel feeding cored-wire-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 for illustration of cored-wire of the present invention and preparation method thereof.
Embodiment 1-5 is obtained cored-wire A1-A5 respectively, wherein, the preparation process of cored-wire A1-A5 is: be that the ferro-titanium powder of 1-2.5mm mixes with different mass ratioes from aluminium powder by particle diameter, form core powder, re-use the cold rolled strip of 2 mm thick (purchased from Pangang Group Panzhihua Steel Vanadium Co., Ltd., trade mark DTLA) wrap up this core powder, roll real also finishing with die finish and become cylindrical wire, thus obtained cored-wire A1-A5.Cored-wire A1-A5 sandwich layer composition and wire diameter as shown in table 1.
Comparative example 1-2
Adopt the preparation process of embodiment 1-5 to obtain cored-wire D1-D2, the sandwich layer composition of cored-wire D1-D2 and wire diameter as shown in table 1.
Table 1
Embodiment 6-10
The present embodiment for illustration of of the present invention to the titanium alloyed method of molten steel.
The molten steel of 120 tons was carried out argon bottom-blowing to ladle before RH stove vacuum-treat departures, the molten steel face diameter making the ladle top of the slag exposed is 25cm, cored-wire feeding wire machine is fed in ladle from exposed molten steel face with two-wire system, and does not allow again to heat after line feeding.The parameters such as the condition control before embodiment cored-wire used, line feeding and wire-feeding velocity are shown in Table 2.
Comparative example 3-4
Carry out according to the method for embodiment 6, difference is, cored-wire cored-wire D1 and D2 of comparative example 1-2 gained, other conditions are as shown in table 2.
Comparative example 5-7
Carry out according to the method for embodiment 6, difference is, changes line feeding condition, specifically as shown in table 2.
Comparative example 8
Carry out according to the method for embodiment 6, difference is, after line feeding, molten steel is heated to 1630 DEG C.
Table 2
Embodiment 6-10 and comparative example 3-8 gained molten steel are detected, records titanium content (% by weight) and titanium recovery rate (%) in gained molten steel, be shown in Table 3.
Table 3
Can be found out by table 3, according to cored-wire of the present invention and method, can more easily titanium content be controlled effectively in the scope of 0.45-0.6 % by weight, and the recovery rate of titanium can reach more than 80%, even more than 83%.
More than describe 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 characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.In addition, also can carry out arbitrary combination between various different 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, and wherein, described sandwich layer contains the iron of the titanium of 45-75 % by weight, the aluminium of 10-30 % by weight and 15-25 % by weight.
2. cored-wire according to claim 1, wherein, described sandwich layer contains the iron of the titanium of 55-65 % by weight, the aluminium of 15-25 % by weight and 15-25 % by weight.
3. cored-wire according to claim 1, wherein, described titanium and iron exist with the form of ferro-titanium, and described aluminium exists with the form of aluminium powder, the particle diameter of described ferro-titanium and described aluminium powder all≤3mm, and wherein the ratio of granularity≤0.5mm is not more than 15%.
4. cored-wire according to claim 1, wherein, the wire diameter of described cored-wire is 10-14 millimeter.
5. the cored-wire in claim 1-4 described in any one is the application in the steel grade of 0.45-0.6 % by weight at production titanium content.
6. one kind to the titanium alloyed method of molten steel, the method comprises the cored-wire fed in molten steel in claim 1-4 described in any one, it is characterized in that, condition control is carried out before line feeding, make: the temperature of molten steel is 1622-1625 DEG C, oxygen activity≤the 10ppm of molten steel, content≤2.5 % by weight of FeO+MnO in ladle slag.
7. method according to claim 6, wherein, carries out condition control before line feeding, makes: the temperature of molten steel is 1622-1625 DEG C, the oxygen activity≤8ppm of molten steel, and in ladle slag, the content of FeO+MnO is 1-2 % by weight.
8. method according to claim 6, wherein, the speed of line feeding is 4.5-7m/s, is preferably 5-6m/s.
9. method according to claim 6, wherein, described method also comprises: do not allow after line feeding again to heat.
10. according to the method in claim 6-9 described in any one, wherein, in gained molten steel, the content of titanium is 0.45-0.6 % by weight.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107574285A (en) * | 2017-08-09 | 2018-01-12 | 新疆八钢铁股份有限公司 | The method that LF refining furnace smelting process controls nitrogen content |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924146A (en) * | 2014-04-08 | 2014-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Titanium-containing core-spun yarn and application thereof, titanium alloying molten steel and preparation method thereof, and titanium-containing alloy steel |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924146A (en) * | 2014-04-08 | 2014-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Titanium-containing core-spun yarn and application thereof, titanium alloying molten steel and preparation method thereof, and titanium-containing alloy steel |
Non-Patent Citations (1)
| Title |
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| 周伟 等: "钛包芯线合金化工艺研究", 《2015第二届钒钛微合金化高强钢开发应用技术交流会会议论文集》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107574285A (en) * | 2017-08-09 | 2018-01-12 | 新疆八钢铁股份有限公司 | The method that LF refining furnace smelting process controls nitrogen content |
| CN107574285B (en) * | 2017-08-09 | 2021-06-22 | 新疆八一钢铁股份有限公司 | Method for controlling nitrogen content through smelting process of LF (ladle furnace) refining furnace |
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