CN107236893A - Control the high titanium welding wire steel production method of high-melting-point field trash - Google Patents
Control the high titanium welding wire steel production method of high-melting-point field trash Download PDFInfo
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- CN107236893A CN107236893A CN201710331193.2A CN201710331193A CN107236893A CN 107236893 A CN107236893 A CN 107236893A CN 201710331193 A CN201710331193 A CN 201710331193A CN 107236893 A CN107236893 A CN 107236893A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of high titanium welding wire steel production method of control high-melting-point field trash, it includes following processing steps：Converter smelting：Control terminal 0.03~0.04wt% of C, 1620~1640 DEG C of tapping temperature, S≤0.025wt%, P≤0.015wt%；Tapping process is stirred using strong argon gas；Start deoxidation alloying after tap 1/3, using carbon dust pre-deoxidation, Si-Al-Ba alloy final deoxidizing；Tapping process is added after alloy material 10s plus lime.This method is not by vacuum treatment device, under the conditions of conventional smelting equipment, made steel, refined and continuous casting manufacturing technique by system optimization, while obtaining good deoxidation, steady titanium effect when smelting high titanium welding wire steel, by the composition control of nonmetallic inclusionsin steel in Al2O3‑Ti2O3MgO phasors are compared with low melting point region（About 1500 DEG C）, mitigate nozzle clogging.Smelting process of the present invention is simple, highly versatile.
Description
Technical field
The present invention relates to a kind of Ferrous Metallurgy technology, especially a kind of high titanium welding wire steel for controlling high-melting-point field trash is produced
Method.
Background technology
Welding wire containing appropriate titanium elements can meet high current, the input of high heat input, the requirement of increasingly automated welding, weldering
Connecing efficiency can be significantly improved, while appearance of weld is also preferable, so such welding wire has been obtained widely in many industries
Using market demand increases year by year.High-titanium alloy welding wire is the main material of current gas shielded arc welding, and this kind of steel is typically required
Ti control range is 0.10%- 0.25%, and Ti content is higher, and the performance of the higher welding wire of class is also more excellent, but smelts difficult
The increase of degree also therewith drastically.Because this steel grade contains higher titanium elements, when use small billet casts the steel grade, inside is deposited
In substantial amounts of high-melting-point non-metallic inclusion, submersed nozzle easily dross is so as to cause production disruption, and high titanium welding wire molten steel connects
Casting castability is poor, properties of product are unstable.
Publication No. CN103045946A Chinese patent discloses a kind of steel for high-titanium alloy welding wire and preparation method thereof,
This method uses the high titanium welding wire steel of technique productions of electric furnace+LF+ applications of vacuum+continuous casting, can be suppressed by adding rare earth element
Oxidation of the alloy welding wire in casting process, overcomes because titanylization enters the continuous casting matter that covering slag causes covering slag to be denatured and triggered
Amount problem, but the cost of steel-making is added by adding rare earth element, and this method versatility is not strong.
Publication No. CN101457273A Chinese patent discloses a kind of steel for small square billet continuous casting high titanium alloy bonding wire
Production method, when it prepares Ti=0.08~0.17% welding wire steel, by reducing aluminium in molten steel, nitrogen element content, solves high titanium
The Submerged Nozzle Clogging Course and crystallizer protecting residue knot fish problem easily sent out during steel grade continuous small-billet casting, realize continuous small-billet casting suitable
Profit production titanium master alloy bonding wire steel.But this method is for the steel-making enterprise without vacuum treatment device, the control of molten steel oxygen position
With field trash it is difficult to control preferable state.
Publication No. CN104831014A Chinese patent application discloses a kind of smelting process of the extraordinary welding wire steel of high titanium,
Its Ti content is controlled 0.14%~0.19%, and average 0.16%；Carbon content control is 0.03%~0.08%；Total oxygen control≤
0.0030%.This method nozzle clogging problem is addressed, but field trash is mainly Ti2O3- MgO is that inclusion melting point is high all
More than 1600 DEG C, and the amount of inclusions is more, the unstable product quality of welding wire.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of high titanium of the stable control high-melting-point field trash of product quality
Welding wire steel production method.
In order to solve the above technical problems, the technical solution used in the present invention is：Including following processing steps：
（1）Converter smelting：Control terminal 0.03~0.04wt% of C, 1620~1640 DEG C of tapping temperature, S≤0.025wt%, P≤
0.015wt%；Tapping process is stirred using strong argon gas；Start deoxidation alloying after tap 1/3, using carbon dust pre-deoxidation, sial
Barium final deoxidizing；Tapping process is added after alloy material 10s plus lime；
（2）LF refining slag：Refining process is by making reducing slag and adding aluminium operation to the further deoxidation of molten steel；Refining slag chooses CaO-
SiO2-CaF2Slag system, basicity is 2.0~2.5；Enter the station oxygen position 10~15ppm when, feed 0.15~0.30m/t of aluminum steel, to electrochemical slag
When add 0.07~0.10kg/t of aluminium powder, 3~4kg/t of calcium carbide to make reducing slag；During more than the 15ppm of oxygen position, hello aluminum steel 0.40~
0.50m/t, adds 0.10~0.15kg/t of aluminium powder, 4~6kg/t of calcium carbide to make reducing slag during to electrochemical slag；Continue plus carbon after slugging
Change calcium pursuit of advanced studies slag, calcium carbide adds 1~2kg/t of total amount, plus before titanium in slag（FeO+MnO）Activity in steel before≤1.0wt%, plus titanium
Oxygen≤25ppm；
（3）3~5min of soft blow before titanium wire is fed, 8~10min of soft blow after titanium wire is fed outbound；Outbound Als controls are in 50~100ppm；
（4）Casting：Open after pouring and being wrapped in place in heat, start the blowing argon gas into middle bag, until middle bag stops pouring；Casting cycle long nozzle
Sealed and protected using argon；Soaking water gap is protected with tundish upper nozzle using asbestos pad.
Step of the present invention（4）It is middle to use the high magnesium coverture of low silicon, content of MgO 82~88wt%, SiO2Content 5wt% and
Below.
Step of the present invention（4）In, the tundish degree of superheat is 40~50 DEG C, and covering slag thickness is 25~30 mm.
Step of the present invention（1）In, tapping process is using the strong argon gas stirrings of 600~800NL/min.
It is using the beneficial effect produced by above-mentioned technical proposal：The present invention is not by vacuum treatment device, in routine
Smelting equipment under the conditions of, made steel, refined and continuous casting manufacturing technique by system optimization, obtain good when smelting high titanium welding wire steel
While deoxidation, steady titanium effect, by the composition control of nonmetallic inclusionsin steel in Al2O3-Ti2O3- MgO phasors are compared with low melting point
Region（About 1500 DEG C）, mitigate nozzle clogging.Smelting process of the present invention is simple, highly versatile.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is Al in the embodiment of the present invention 12O3-Ti2O3Distribution map of the composition of-MgO slag system field trashes in phasor；
Fig. 2 is Al in the embodiment of the present invention 22O3-Ti2O3Distribution map of the composition of-MgO slag system field trashes in phasor.
Embodiment
The high titanium welding wire steel production method of this control high-melting-point field trash uses following processing steps：
（1）Converter steelmaking process：Converter control terminal 0.03~0.04wt% of C, 1620~1640 DEG C of tapping temperature, S≤
0.025wt%、P≤0.015wt%.Tapping starts to overall process is finished using the strong argon gas stirrings of 600~800NL/min, promotes just
The field trash that deoxidation of beginning is formed fully floats and excluded.Start deoxidation alloying after tap 1/3, tapping is pre- using carbon dust
Deoxidation, Si-Al-Ba alloy final deoxidizing.Tapping process is added after alloy material 10s plus lime.
（2）LF refining process：
A, the control of LF refining slag system：Refining process is by making reducing slag and adding aluminium operation to the further deoxidation of molten steel.To meet steel
Middle total oxygen content T [O] requires and top slag is for field trash adsorption capacity, and refining slag chooses CaO-SiO2-CaF2Slag system；Refining
Basicity of slag is to 2.0~2.5.10~the 15ppm of oxygen position that enters the station feeds 0.15~0.30m/t of aluminum steel immediately, adds aluminium powder during to electrochemical slag
0.07~0.10kg/t, 3~4kg/t of calcium carbide make reducing slag；Oxygen position more than 15ppm feed 0.40~0.50m/t of aluminum steel, to electrification
0.10~0.15kg/t of aluminium powder, 4~6kg/t of calcium carbide is added to make reducing slag during slag.Continue after slugging plus calcium carbide pursuit of advanced studies slag, carbonization
Calcium adds 1~2kg/t of total amount, plus white slag effect is must assure that before titanium.Target：Plus before titanium in slag（FeO+MnO）≤ 1.0wt%, plus
Activity oxygen≤25ppm in steel before titanium.-- original text " adds 0.07~0.15kg/t " of aluminium powder to be revised as and claim during to electrochemical slag
Consistent " adds 0.10~0.15kg/t " of aluminium powder during to electrochemical slag.
B, LF stove Ti Alloying are controlled：Add titanium using the low low aluminium titanium wire mode of nitrogen is fed, feed 3~5min of soft blow before titanium wire, feed
8~10min of soft blow is outbound after titanium wire.Control outbound Als in 50~100ppm, field trash is Al2O3-Ti2O3- MgO systems are mingled with
Thing.It facts have proved that rational alloying route can significantly reduce the quantity that tilalite is mingled with, improve Cleanliness of Molten Steel.
（3）Casting cycle：
A, whole process protection cast：Open after pouring and being wrapped in place in heat, start the blowing argon gas into middle bag, until middle bag stops pouring；Cast
Journey long nozzle seals protection using argon；Soaking water gap is protected with tundish upper nozzle using asbestos pad.
B, tundish covering flux：Main adjustment coverture MgO and SiO2Content, it is to avoid with Ti oxidations production TiO in molten steel2
It is mingled with, using the high magnesium coverture of low silicon, content of MgO 82~88%, SiO2Content 5% and following.Big Baogang's water is opened pour after start plus
Enter 30 bags（Every bag of 10kg）, it is ensured that middle bag liquid level is not exposed.
C, crystallizer protecting residue：Molten steel largely separates out TiN at crystallizer meniscus, and is gathered in molten steel and covering slag circle
At face, with the Fe in covering slag2O3Reaction, releases nitrogen, promotes local molten steel temperature to decline, and is formed after condensation " knot fish ".Pass through
Improve the tundish degree of superheat（40~50 DEG C）And by covering thicker covering slag（25~30mm of thickness）Keep meniscus at compared with
High temperature, suppresses TiN and separates out.The covering slag that the present invention is used will have relatively low fusion temperature（1200 DEG C and less）, compared with
Fast molten speed（50S and within）, relatively low basicity（1.1 and less）With suitable viscosity（0.5~0.7 PaS）, so as to have
There is the good feature of the lubrication and oxidation-protective effect of glass dregs, the continuous casting for being allowed to be particularly suitable for use in steel for high-titanium alloy welding wire is used,
The oxidation of the alloying element such as Ti in titanium master alloy steel can be effectively prevented, and can effectively prevent Ti from producing titanium oxide after aoxidizing to protecting
The influence that slag performance and using effect deteriorate is protected, prevents that covering slag crusts in crystallizer, hence it is evident that improves lubricant effect and improves and cast
Base quality.
Embodiment 1-6：The concrete technology of the high titanium welding wire steel production method of this control high-melting-point field trash is as described below.
（1）Using above-mentioned technical process, the process parameter control of each embodiment converter steelmaking process is as shown in table 1, refining
Molten steel amount about 70t/ stoves.
Table 1：Kiln process control parameter
（2）The process parameter control of each embodiment LF refining process is as shown in table 2-3.
Table 2：Slag system control parameter during LF refining
Table 3：Ti Alloying control parameter during LF refining
（3）The process parameter control of each embodiment casting cycle is as shown in table 4.
Table 4：Casting process control parameter
Above-described embodiment is made steel by system optimization, refined and continuous casting manufacturing technique, obtains good de- when smelting high titanium welding wire steel
While oxygen, steady titanium effect, by the composition control of nonmetallic inclusionsin steel in Al2O3-Ti2O3- MgO phasors are compared with low melting point area
Domain；Wherein, the non-metallic inclusion composition control of embodiment 1 is in Al2O3-Ti2O3- MgO phasors are as shown in figure 1, embodiment 2
Non-metallic inclusion composition control is in Al2O3-Ti2O3- MgO phasors are as shown in Figure 2.
In Fig. 1, in the region between 1600 DEG C of lines, fusing point is below 1600 DEG C；Similarly, the region between 1400 DEG C of lines
Interior, fusing point is below 1400 DEG C.Stain represents steel inclusion in figure, as seen from Figure 1,6 stains, has 4 at 1400 DEG C
In region between line, i.e., fusing point is below 1400 DEG C；Have in 1 region between 1400 DEG C of lines and 1600 DEG C of lines, that is, melt
O'clock between 1400~1600 DEG C；There is 1 on 1600 DEG C of lines, i.e. about 1600 DEG C of fusing point.
Have in Fig. 2 in 2 stains, 1 region between 1400 DEG C of lines, i.e., fusing point is below 1400 DEG C；1 1400
DEG C between line and 1600 DEG C of lines close in the region of 1400 DEG C of lines, i.e., fusing point is below 1500 DEG C.
Claims (4)
1. a kind of high titanium welding wire steel production method of control high-melting-point field trash, it is characterised in that it includes following processing steps：
（1）Converter smelting：Control terminal 0.03~0.04wt% of C, 1620~1640 DEG C of tapping temperature, S≤0.025wt%, P≤
0.015wt%；Tapping process is stirred using strong argon gas；Start deoxidation alloying after tap 1/3, using carbon dust pre-deoxidation, sial
Barium final deoxidizing；Tapping process is added after alloy material 10s plus lime；
（2）LF refining slag：Refining process is by making reducing slag and adding aluminium operation to the further deoxidation of molten steel；Refining slag chooses CaO-
SiO2-CaF2Slag system, basicity is 2.0~2.5；Enter the station oxygen position 10~15ppm when, feed 0.15~0.30m/t of aluminum steel, to electrochemical slag
When add 0.07~0.10kg/t of aluminium powder, 3~4kg/t of calcium carbide to make reducing slag；During more than the 15ppm of oxygen position, hello aluminum steel 0.40~
0.50m/t, adds 0.10~0.15kg/t of aluminium powder, 4~6kg/t of calcium carbide to make reducing slag during to electrochemical slag；Continue plus carbon after slugging
Change calcium pursuit of advanced studies slag, calcium carbide adds 1~2kg/t of total amount, plus before titanium in slag（FeO+MnO）Activity in steel before≤1.0wt%, plus titanium
Oxygen≤25ppm；
（3）3~5min of soft blow before titanium wire is fed, 8~10min of soft blow after titanium wire is fed outbound；Outbound Als controls are in 50~100ppm；
（4）Casting：Open after pouring and being wrapped in place in heat, start the blowing argon gas into middle bag, until middle bag stops pouring；Casting cycle long nozzle
Sealed and protected using argon；Soaking water gap is protected with tundish upper nozzle using asbestos pad.
2. the high titanium welding wire steel production method of high-melting-point field trash is controlled according to claim 1, it is characterised in that：The step
Suddenly（4）It is middle to use the high magnesium coverture of low silicon, content of MgO 82~88wt%, SiO2Content 5wt% and following.
3. the high titanium welding wire steel production method of high-melting-point field trash is controlled according to claim 1, it is characterised in that：The step
Suddenly（4）In, the tundish degree of superheat is 40~50 DEG C, and covering slag thickness is 25~30 mm.
4. the high titanium welding wire steel production method of high-melting-point field trash is controlled according to claim 1,2 or 3, it is characterised in that：
The step（1）In, tapping process is using the strong argon gas stirrings of 600~800NL/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424135A (en) * | 2020-05-29 | 2020-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of low-cost wear-resistant steel |
| CN112359278A (en) * | 2020-10-19 | 2021-02-12 | 中天钢铁集团有限公司 | Preparation method of steel for engineering machinery gear and preparation method of forge piece of steel |
| CN114836673A (en) * | 2022-04-14 | 2022-08-02 | 江苏省沙钢钢铁研究院有限公司 | Welding wire steel and preparation process thereof |
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| JP2000079495A (en) * | 1998-09-03 | 2000-03-21 | Kawasaki Steel Corp | Welding steel wire and its manufacture |
| CN103882303A (en) * | 2014-02-27 | 2014-06-25 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for steel for gas protection welding wire |
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| CN104278197A (en) * | 2014-10-16 | 2015-01-14 | 江苏省沙钢钢铁研究院有限公司 | Smelting method of steel for low-silicon high-titanium welding wire |
| CN104831014A (en) * | 2015-03-31 | 2015-08-12 | 青岛钢铁控股集团有限责任公司 | High titanium special welding wire steel smelting method |
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| JP2000079495A (en) * | 1998-09-03 | 2000-03-21 | Kawasaki Steel Corp | Welding steel wire and its manufacture |
| CN103882303A (en) * | 2014-02-27 | 2014-06-25 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for steel for gas protection welding wire |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111424135A (en) * | 2020-05-29 | 2020-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of low-cost wear-resistant steel |
| CN112359278A (en) * | 2020-10-19 | 2021-02-12 | 中天钢铁集团有限公司 | Preparation method of steel for engineering machinery gear and preparation method of forge piece of steel |
| CN114836673A (en) * | 2022-04-14 | 2022-08-02 | 江苏省沙钢钢铁研究院有限公司 | Welding wire steel and preparation process thereof |
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