CN107236893B - 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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- CN107236893B CN107236893B CN201710331193.2A CN201710331193A CN107236893B CN 107236893 B CN107236893 B CN 107236893B CN 201710331193 A CN201710331193 A CN 201710331193A CN 107236893 B CN107236893 B CN 107236893B
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- slag
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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
Abstract
The invention discloses a kind of high titanium welding wire steel production methods of control high-melting-point field trash comprising 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 adds lime after adding alloy material 10s.This method is not by vacuum treatment device, under the conditions of conventional smelting equipment, by system optimization steel-making, refining and continuous casting manufacturing technique, while good deoxidation, steady titanium effect are obtained 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, versatile.
Description
Technical field
The present invention relates to a kind of Ferrous Metallurgy technology, especially a kind of high titanium welding wire steel production of control high-melting-point field trash
Method.
Background technology
Welding wire containing appropriate titanium elements can meet high current, high heat input inputs, 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 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 generally requires
The control range of Ti 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 hardly possible
The increase of degree also therewith drastically.Since this steel grade contains higher titanium elements, when use small billet casts the steel grade, inside is deposited
In a large amount of high-melting-point non-metallic inclusion, submersed nozzle easily dross connects so as to cause production disruption, high titanium welding wire molten steel
Casting castability is poor, properties of product are unstable.
The Chinese patent of Publication No. CN103045946A 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+ vacuum processings+continuous casting, can be inhibited by the way that rare earth element is added
Oxidation of the alloy welding wire in casting process overcomes because titanyl enters the continuous casting matter caused due to covering slag causes covering slag to be denaturalized
Amount problem, but the cost of steel-making is increased by adding rare earth element, and this method versatility is not strong.
The Chinese patent of Publication No. CN101457273A discloses a kind of steel for small square billet continuous casting high titanium alloy bonding wire
Production method when preparing Ti=0.08~0.17% welding wire steel, by reducing aluminium, nitrogen element content in molten steel, solves high titanium
The Submerged Nozzle Clogging Course and crystallizer protecting residue knot fish problem easily sent out when steel grade continuous small-billet casting, it is suitable to realize continuous small-billet casting
Profit production titanium master alloy bonding wire steel.But this method is for the steel-making enterprise of no vacuum treatment device, the control of molten steel oxygen position
With field trash it is difficult to control ideal state.
The Chinese patent application of Publication No. CN104831014A discloses a kind of smelting process of high titanium special type welding wire steel,
The control of its Ti content is 0.14%~0.19%, 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 height is all
At 1600 DEG C or more, and the amount of inclusions is more, the unstable product quality of welding wire.
Invention content
The technical problem to be solved in the present invention is to provide a kind of high titaniums for the control high-melting-point field trash that product quality is stablized
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,
Si-Al-Ba alloy final deoxidizing；Tapping process adds lime after adding alloy material 10s；
（2）LF refining slag：Refining process is by making reducing slag and adding aluminium operation to the further deoxidation of molten steel；Refining slag is chosen
CaO-SiO2-CaF2Slag system, basicity are 2.0~2.5；Enter the station 10~15ppm of oxygen position when, feed 0.15~0.30m/t of aluminum steel, to electricity
0.07~0.10kg/t of aluminium powder, 3~4kg/t of calcium carbide is added to make reducing slag when slugging；When oxygen position 15ppm or more, aluminum steel 0.40 is fed
~0.50m/t adds 0.10~0.15kg/t of aluminium powder, 4~6kg/t of calcium carbide to make reducing slag when to electrochemical slag；Continue to add after slugging
Calcium carbide takes an advanced study slag, and 1~2kg/t of total amount is added in calcium carbide, adds before titanium in slag（FeO+MnO）≤ 1.0wt% adds living in steel before titanium
Spend oxygen≤25ppm；
（3）3~5min of soft blow before hello titanium wire, 8~10min of soft blow is outbound after feeding titanium wire；Outbound Als control 50~
100ppm；
（4）Casting：It opens after pouring and being wrapped in place in heat, starts the blowing argon gas into middle packet, until middle packet stops pouring；Casting process is long
The mouth of a river is using argon envelope protection；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 advantageous effect caused by above-mentioned technical proposal：The present invention is not by vacuum treatment device, in routine
Smelting equipment under the conditions of, obtained by system optimization steel-making, refining and continuous casting manufacturing technique, when smelting high titanium welding wire steel good
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, versatile.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is Al in the embodiment of the present invention 12O3-Ti2O3Distribution map of the ingredient of-MgO slag system field trashes in phasor；
Fig. 2 is Al in the embodiment of the present invention 22O3-Ti2O3Distribution map of the ingredient of-MgO slag system field trashes in phasor.
Specific implementation mode
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 excludes.Start deoxidation alloying after tap 1/3, tapping is pre- using carbon dust
Deoxidation, Si-Al-Ba alloy final deoxidizing.Tapping process adds lime after adding alloy material 10s.
（2）LF refining process：
A, LF refining slag system controls：Refining process is by making reducing slag and adding aluminium operation to the further deoxidation of molten steel.It is full
Total oxygen content T [O] is required in sufficient steel and top slag is for field trash adsorption capacity, and refining slag chooses CaO-SiO2-CaF2Slag system；
Basicity of slag is refined 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 when to electrochemical slag
0.07~0.10kg/t of powder, 3~4kg/t of calcium carbide make reducing slag；Oxygen position 15ppm or more feeds 0.40~0.50m/t of aluminum steel, to electricity
0.10~0.15kg/t of aluminium powder, 4~6kg/t of calcium carbide is added to make reducing slag when slugging.Continue after slugging plus calcium carbide takes an advanced study slag, carbon
Change calcium and 1~2kg/t of total amount is added, must assure that white slag effect before adding titanium.Target：Add before titanium in slag（FeO+MnO）≤ 1.0wt%,
Add before titanium activity oxygen≤25ppm in steel.
B, LF stoves Ti Alloying controls：Add titanium using the low aluminium titanium wire mode of low nitrogen is fed, feeds 3~5min of soft blow before titanium wire, feed
8~10min of soft blow is outbound after titanium wire.Outbound Als is controlled in 50~100ppm, field trash Al2O3-Ti2O3- MgO systems are mingled with
Object.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 process：
A, whole process protection is poured into a mould：It opens after pouring and being wrapped in place in heat, starts the blowing argon gas into middle packet, until middle packet stops pouring；It pours
Casting process long nozzle is using argon envelope protection；Soaking water gap is protected with tundish upper nozzle using asbestos pad.
B, tundish covering flux：Main adjustment coverture MgO and SiO2Content avoids and 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）, packet liquid level is not exposed in guarantee.
C, crystallizer protecting residue：TiN is largely precipitated in molten steel at crystallizer meniscus, and is gathered in molten steel and covering slag circle
At face, with the Fe in covering slag2O3Nitrogen is released in reaction, and local molten steel temperature is promoted 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 inhibits TiN to be precipitated.The covering slag that the present invention uses will have lower fusion temperature（1200 DEG C and less）, compared with
Fast molten speed（50S and within）, lower basicity（1.1 and less）With suitable viscosity（0.5~0.7 PaS）, to have
There are the lubrication of glass dregs and the feature that oxidation-protective effect is good, be allowed to use especially suitable for the continuous casting of steel for high-titanium alloy welding wire,
It can be effectively prevent the oxidation of the alloying elements such as Ti in titanium master alloy steel, and titanium oxide is produced to protecting after can effectively prevent Ti oxidations
The influence that slag performance and using effect deteriorate is protected, prevents covering slag in crystallizer from crusting, 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 process is as shown in table 4.
Table 4：Casting process control parameter
Above-described embodiment is obtained good by system optimization steel-making, refining and continuous casting manufacturing technique when smelting high titanium welding wire steel
While good deoxidation, steady titanium effect, by the composition control of nonmetallic inclusionsin steel in Al2O3-Ti2O3- MgO phasors are compared with eutectic
Point region；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 at 1600 DEG C or less；Similarly, the region between 1400 DEG C of lines
Interior, fusing point is at 1400 DEG C or less.Stain represents steel inclusion in figure, as seen from Figure 1,6 stains, have 4 at 1400 DEG C
In region between line, i.e., fusing point is at 1400 DEG C or less；Have in 1 region between 1400 DEG C of lines and 1600 DEG C of lines, i.e., it is molten
O'clock between 1400~1600 DEG C；Have 1 on 1600 DEG C of lines, i.e. about 1600 DEG C of fusing point.
There are 2 stains in Fig. 2, in 1 region between 1400 DEG C of lines, i.e., fusing point is at 1400 DEG C or less；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 at 1500 DEG C or less.
Claims (4)
1. a kind of high titanium welding wire steel production method of control high-melting-point field trash, which is characterized 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 adds lime after adding alloy material 10s；
（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 are 2.0~2.5；Enter the station 10~15ppm of oxygen position when, 0.15~0.30m/t of aluminum steel is fed, to electrochemical slag
When add 0.07~0.10kg/t of aluminium powder, 3~4kg/t of calcium carbide to make reducing slag；When oxygen position is more than 15ppm, 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 when to electrochemical slag；Continue to add carbon after slugging
Change calcium and take an advanced study slag, 1~2kg/t of total amount is added in calcium carbide, adds before titanium in slag（FeO+MnO）≤ 1.0wt% adds before titanium activity in steel
Oxygen≤25ppm；
（3）3~5min of soft blow before hello titanium wire, 8~10min of soft blow is outbound after feeding titanium wire；Outbound Als controls are in 50~100ppm；
（4）Casting：It opens after pouring and being wrapped in place in heat, starts the blowing argon gas into middle packet, until middle packet stops pouring；Casting process long nozzle
It is sealed and is protected using argon；Soaking water gap is protected with tundish upper nozzle using asbestos pad.
2. controlling the high titanium welding wire steel production method of high-melting-point field trash 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. controlling the high titanium welding wire steel production method of high-melting-point field trash 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. according to the high titanium welding wire steel production method of the control high-melting-point field trash of 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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| 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 |
| CN112359278B (en) * | 2020-10-19 | 2021-08-24 | 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 |
| CN114836673B (en) * | 2022-04-14 | 2023-04-11 | 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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| JP3463574B2 (en) * | 1998-09-03 | 2003-11-05 | Ｊｆｅスチール株式会社 | Welding steel wire and method of manufacturing the same |
| CN103882303B (en) * | 2014-02-27 | 2015-10-21 | 江苏省沙钢钢铁研究院有限公司 | A kind of smelting process of gas protecting welding wire steel |
| CN104259414A (en) * | 2014-09-16 | 2015-01-07 | 河北钢铁股份有限公司唐山分公司 | Titanium-containing solder wire steel production method capable of alleviating continuous casting nozzle clogging |
| CN104278197B (en) * | 2014-10-16 | 2017-01-25 | 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 |
| CN104831014B (en) * | 2015-03-31 | 2017-11-24 | 青岛特殊钢铁有限公司 | A kind of smelting process of high titanium special type welding wire steel |
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