CN111716037A - Method for improving quality of welding wire steel casting blank - Google Patents
Method for improving quality of welding wire steel casting blank Download PDFInfo
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- CN111716037A CN111716037A CN201910218207.9A CN201910218207A CN111716037A CN 111716037 A CN111716037 A CN 111716037A CN 201910218207 A CN201910218207 A CN 201910218207A CN 111716037 A CN111716037 A CN 111716037A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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Abstract
The invention relates to the field of wire steel, in particular to a method for improving the quality of a wire steel casting blank. The BZJ60-Ti gas shielded welding wire is mainly used for welding high-quality carbon steel and low-alloy high-strength steel, requires the tensile strength of weld metal and has good toughness. Meanwhile, the welding wire needs less splashing in the welding process, the electric arc is stable, the welding seam formability is good, and the like. It should be noted that these requirements are only achieved by strict control of the chemical composition of the steel and purification of the steel. The BZJ60-Ti welding wire steel comprises the following chemical components in percentage by mass: c0.06-0.10; 0.60-0.90% of Si; 1.50-1.80 parts of Mn; p is less than or equal to 0.025; s is less than or equal to 0.020; v is 0.02-0.06; 0.08 to 0.13 Ti; b0.0025 to 0.005; 0.35-0.55% of Cr; ca is less than or equal to 0.0015; o is less than or equal to 0.004; n is less than or equal to 0.006; the balance being Fe. The invention optimizes the aspects of titanium content control, castability control, calcium content control and the like in the production process of the welding wire steel BZJ60-Ti, solves the phenomena of casting blank quality and welding splash, improves the product quality and finally meets the customer requirements.
Description
Technical Field
The invention relates to the field of wire steel, in particular to a method for improving the quality of a wire steel casting blank.
Background
The welding wire steel has the biggest characteristics that the requirements of welding line quality, mechanical property and drawing process property of welding wires must be ensured, no air holes are generated, and splashing is small, so that strict requirements are imposed on chemical components of steel. Meanwhile, in order to ensure the uniform performance of the welding wire and not allow serious component segregation, the welding wire steel must be ensured to have higher metallurgical quality.
BZJ60-Ti hot rolled wire rod belongs to low carbon steel, the reason of adopting low carbon is that the hot rolled wire rod has good plasticity and the welding wire is easier to draw when the carbon content is low, and on the other hand, the hot rolled wire rod can reduce the content of reducing gas CO, reduce splashing or blowholes, increase the temperature when the welding seam metal is solidified and is beneficial to overhead welding. Other alloy elements are added to ensure the comprehensive mechanical property of the welding seam and play a certain role in the welding process performance and impurity removal.
With the continuous increase of steel grades and output, the market has higher and higher requirements on product quality. Some of the products produced by steel plants present problems, such as: BZJ60-Ti welding wire steel has high titanium content, which affects the castability of molten steel and generates flocculation phenomenon during casting; in addition, the titanium recovery rate is unstable, a large amount of titanium oxide inclusions are formed, so that the casting powder effect is poor, the defects of scabbing, water seepage and the like are generated on the surface of a casting blank, and the quality of the casting blank is influenced; moreover, in the welding use process of a welding wire steel user, the phenomenon of welding spatter often occurs, and the welding quality and efficiency are seriously influenced.
Disclosure of Invention
The invention aims to provide a method for improving the casting blank quality of a welding wire steel, which optimizes the aspects of titanium content control, castability control, calcium content control and the like in the production process of the welding wire steel BZJ60-Ti, solves the problems of casting blank quality and welding spatter, improves the product quality and finally meets the customer requirements.
The technical scheme of the invention is as follows:
a method for improving the quality of a welding wire steel casting blank comprises the following chemical components in percentage by mass:
c0.06-0.10; 0.60-0.90% of Si; 1.50-1.80 parts of Mn; p is less than or equal to 0.025; s is less than or equal to 0.020; v is 0.02-0.06; 0.08 to 0.13 Ti; b0.0025 to 0.005; 0.35-0.55% of Cr; ca is less than or equal to 0.0015; o is less than or equal to 0.004; n is less than or equal to 0.006; the balance being Fe.
The method for improving the quality of the welding wire steel casting blank comprises the following production process route of BZJ60-Ti welding wire steel casting blank: the mixer → the pretreatment of molten iron → 120 ton converter → the blowing of argon at the bottom of the ladle → the refining in the LF furnace → the continuous casting of square billets.
According to the method for improving the quality of the wire steel casting blank, the steel ladle is clean, and the former furnace cannot be used for containing molten steel containing Al and calcium; silicon-manganese deoxidation alloying is adopted in the converter tapping process, and materials with high calcium and aluminum are added in the early stage of tapping to fully oxidize calcium and aluminum; in the converter tapping and LF furnace refining processes, materials containing high aluminum and calcium are strictly forbidden to be used for carrying out deoxidation, slagging and alloying processes; the LF refining strictly controls the content of [ Al ] in the molten steel, so that [ Alt ] is less than or equal to 0.007 wt%; the LF refining furnace ensures the fluidity of slag, controls the alkalinity of the slag to be less than or equal to 2.0 and effectively controls the form of inclusions.
According to the method for improving the quality of the wire steel casting blank, an LF refining furnace adopts LF white slag operation, refining slag alkalinity control, argon blowing, ferrotitanium optimization and calcium treatment to control the purity and the castability of molten steel:
first LF white slag operation
The deoxidation of the LF furnace is realized by making white slag in the refining process, and the ferrosilicon powder is used for deoxidation, so that the aluminum-containing deoxidizer is avoided being used for increasing Al in steel2O3Carrying out inclusion;
the operation of blowing argon in LF process
The LF furnace argon blowing operation is that argon is blown into steel through a bottom argon blowing device of a ladle in the refining process to drive the molten steel to circulate, so that the aggregation and floating of inclusions are promoted by uniform components and temperature, and the control of non-metallic inclusions in BZJ60-Ti welding wire steel is better and is below level 1.0;
control of slag alkalinity of LF
CaO-SiO is adopted as basic slag of LF refining slag2-Al2O3The slag system with a low melting point of a ternary phase diagram is obtained, and the alkalinity of the slag is controlled to be less than or equal to 2.0;
optimization of titanium-iron alloy
Using ferrotitanium intermediate alloy TiFe70 or TiFe40 to match TiFe70, adding ferrotitanium in the late refining stage under the condition of good deoxidation, and blowing argon for 2-4 min after adding ferrotitanium;
operation of carrying out calcium treatment
Feeding a calcium iron wire into the molten steel at a rate of 150 m/furnace, wherein the calcium content is controlled within 0.0015 wt%.
In the method for improving the quality of the wire steel casting blank, in the continuous casting process, in the whole process from a steel ladle to a crystallizer, the process of isolating molten steel from air is called non-oxidation casting; the continuous casting non-oxidation casting comprises three aspects: firstly, protecting the liquid level of a steel ladle, a tundish and a crystallizer; secondly, protecting a ladle long nozzle and an invasive nozzle; and thirdly, the long nozzle and the invasive nozzle are respectively connected with the lower nozzles of the ladle and the tundish, a gap exists at the joint, the gap is sealed and protected, and the argon sealing technology is adopted when the tundish is opened for casting.
According to the method for improving the quality of the welding wire steel casting blank, the drawing speed of continuous casting is 2.0-2.2 m/min.
The invention has the advantages and beneficial effects that:
⑴ the invention finds out the reason of BZJ60-Ti welding wire steel pouring flocculation flow and poor casting blank quality through theoretical and experimental verification, and Al in molten steel is adjusted through process technology2O3The inclusions are effectively controlled, the castability of the molten steel is improved, and the purity and the castability of the molten steel are obviously improved.
The method improves and stabilizes the recovery rate of the ferrotitanium by measures such as alloy optimization selection, white slag refining and the like, and the recovery rate of the ferrotitanium can stably reach 55 percent at present.
⑶ the invention effectively controls the calcium content in BZJ60-Ti welding wire steel through component optimization, material use optimization and LF outbound proper amount calcium treatment, and the calcium content in BZJ60-Ti steel can be controlled at 10 × 10-6。
According to the invention, through a series of process optimization measures, the quality of the BZJ60-Ti casting blank is obviously improved, the cleaning rate of the casting blank is reduced by 75%, and the yield of molten steel is greatly improved.
Through research work on development and production technologies of BZJ60-Ti welding wire steel, the BZJ60-Ti welding wire steel batch production result shows that: BZJ60-Ti welding wire steel has chemical composition, mechanical property and structure state meeting the preset requirements. And BZJ60-Ti produced according to the prior art has excellent drawing performance and welding performance, meets the requirements of downstream users and end users, and reaches or even exceeds the level of similar enterprises.
Sixthly, BZJ60-Ti contains titanium, chromium and vanadium, the requirement on the titanium content is high, and molten steel is viscous; the stable improvement of the titanium recovery rate, the reduction of titanium oxide inclusions in steel and the improvement of the castability of molten steel are realized through processes of white slag refining of an LF furnace, titanium alloy adjustment, optimization selection and the like.
The invention improves the castability of molten steel by proper calcium treatment, controls the Ca content of steel to be less than 10ppm, and greatly reduces the splashing phenomenon during welding.
And selecting the optimal proportion of the covering slag through comparison of the parameters of the covering slag; and the casting blank quality is improved by controlling the pulling speed stability.
Drawings
FIG. 1 is a macroscopic view of BZJ60-Ti wire strand according to the present invention. Wherein, (a) the first macrostructure, (b) the second macrostructure, (c) the third macrostructure, and (d) the fourth macrostructure.
Detailed Description
In the specific implementation process, the method for improving the casting blank quality of the BZJ60-Ti wire welding steel comprises the following steps:
BZJ60-Ti welding wire steel casting blank production process route: the method comprises the steps of mixing a blast furnace, pretreating molten iron (removing S and removing slag), a 120-ton converter (top and bottom combined blowing), blowing argon at the bottom of a ladle, refining in an LF furnace, and continuously casting a 150 x 150mm square billet.
The BZJ60-Ti gas shielded welding wire is mainly used for welding high-quality carbon steel and low-alloy high-strength steel, requires the tensile strength of weld metal and has good toughness. Meanwhile, the welding wire needs less splashing in the welding process, the electric arc is stable, the welding seam formability is good, and the like. It should be noted that these requirements are only achieved by strict control of the chemical composition of the steel and purification of the steel. For these requirements, the composition control of BZJ60-Ti weld-line steel is briefly described as follows:
c: c, while improving the yield and tensile strength of the weld, is detrimental to toughness and also increases weld metal cold crack sensitivity. Therefore, the C content of the BZJ60-Ti weld line steel is controlled to be 0.06-0.10.
② Mn and Si: the alloying elements Mn and Si are important strengthening elements of the steel. The strengthening effect mainly comes from solid solution strengthening and structure strengthening. In addition, Mn and Si are important deoxidizers of the weld pool during welding. The existence of the welding flux can avoid air holes in welding lines and inhibit splashing during welding. And the content of the added Mn and the content of the added Si are reasonably matched (for example, the Mn/Si is 1.5-3), and the content of inclusions in a welding line can be reduced, so that the toughness of the welding line is in a higher level. Therefore, the Mn and Si contents of the BZJ60-Ti weld line steel are strictly controlled to be 0.60-0.90 Si and 1.50-1.80 Mn.
P: p can strengthen the weld metal, but is detrimental to the low temperature toughness of the steel. Therefore, the P content of the BZJ60-Ti weld line steel is controlled below 0.025 percent.
V: the structure crystal grains can be refined, and the strength and the toughness are improved. Therefore, the V content of the BZJ60-Ti weld line steel is controlled to be 0.02-0.06.
And fifth, Ti and B: titanium is a strong deoxidizer in steel, and can make the internal structure of steel compact, refine crystal grains, and reduce ageing sensitivity and cold brittleness. In addition, in the production process, the recovery rate of ferrotitanium is low, a large amount of ferrotitanium is oxidized to form a large amount of titanium oxide slag inclusion, the melting effect of the casting powder is influenced, and the quality of the casting blank is poor; stabilizing the recovery rate of ferrotitanium and reasonably controlling the titanium content becomes one of important factors for improving the quality of casting blanks. The toughness of weld metal can be improved by the composite addition of Ti and B, and the content of Ti and B in BZJ60-Ti weld line steel is controlled to be 0.08-0.13 of Ti and 0.0025-0.005 of B.
Sixthly, Cr: the strength of the weld metal is improved, the uniformity of the structure is improved, and the atmospheric corrosion resistance of the weld can be improved. Therefore, the Cr content of the BZJ60-Ti weld line steel is controlled to be 0.35-0.55.
And (c) Ca: in order to prevent the spattering phenomenon of welding spatters when a client is used for welding, the control that the calcium content is as low as possible is particularly important; the Ca content in the steel is controlled to be less than 15ppm, preferably less than 10ppm, so that the splashing phenomenon during welding can be reduced.
In order to solve the problem of poor castability of molten steel in the production process, converter deoxidation alloying, ladle cleanliness, refining deoxidation process and the like are standardized and optimized, and the specific conditions are as follows:
the method has the advantages that steel ladles are clean, and the former furnace cannot be used for containing Al-containing and calcium-treated molten steel.
And silicon-manganese deoxidation alloying is adopted in the converter tapping process.
And thirdly, in the converter tapping process, the alloy adding time and sequence are strictly controlled, and the materials with high contents of calcium and aluminum are added in the early stage of tapping, so that the calcium and the aluminum are fully oxidized.
And fourthly, in the processes of converter tapping and LF refining, materials containing high aluminum and high calcium are strictly forbidden to be used for carrying out processes such as deoxidation, slagging, alloying and the like.
The content of [ Al ] in the molten steel is strictly controlled in LF refining, and the fact that calcification treatment is carried out when the content of [ Al ] is high is avoided (namely [ Alt ] is more than or equal to 0.007 wt%, molten steel flocculation is easily caused, and at present, the content of [ Alt ] is controlled to be less than or equal to 0.007 wt%).
Sixthly, controlling components to require a middle and lower limit in an internal control manner in the refining early stage, and reducing the alloy consumption for component adjustment in the middle and later stages.
The refining furnace of the Ania odorata LF produces good slag, ensures the fluidity of the slag, controls the proper slag alkalinity (less than or equal to 2.0) and effectively controls the form of inclusions.
In order to improve the purity and the castability of the molten steel, the LF refining furnace plays a vital role, and the purity and the castability of the molten steel are mainly controlled by LF white slag operation, refining slag alkalinity control, good argon blowing effect and proper calcium treatment.
First LF white slag operation
The LF furnace deoxidation is realized by making white slag in the refining process, and the basic functions of the refining slag are deep desulfurization, deep deoxidation and bubbling submerged arc; removing non-metallic inclusions and purifying molten steel; changing the shape of the inclusions; preventing the secondary oxidation of the molten steel.
BZJ60-Ti welding wire steel production requires LF to make white slag and use ferrosilicon powder to deoxidize, avoiding using aluminum-containing deoxidizer to increase Al in steel2O3And (4) inclusion.
The operation of blowing argon in LF process
The LF furnace argon blowing operation is to blow argon into steel through a bottom argon blowing device of a ladle in the refining process to drive the molten steel to circulate, so that the components and the temperature are uniform, and the aggregation and floating of impurities are promoted. Therefore, the temperature and the components of the molten steel are uniform, the casting process is stable, the content of inclusions and gas in the steel is reduced, the quality of the steel is improved, and the control of non-metallic inclusions in BZJ60-Ti welding wire steel is better and is below 1.0 grade.
Control of slag alkalinity of LF
CaO-SiO is adopted as basic slag of LF refining slag2-Al2O3The basic slag has the most important function of controlling the alkalinity of slag, and the alkalinity of slag has great influence on deoxidation and desulfurization in the refining process, and the reduction of the alkalinity of refined slag can promote the morphological change of inclusion and further purify molten steel.
TABLE 1 LF slag basicity control
| SiO2(wt％) | CaO(wt％) | Basicity R |
| 27.36 | 42.59 | 1.56 |
| 25.79 | 50.29 | 1.95 |
| 33.8 | 59.76 | 1.77 |
| 32.52 | 59.63 | 1.83 |
| 26.08 | 50.34 | 1.93 |
| 27.53 | 50.2 | 1.82 |
Optimization of titanium-iron alloy
The method is used as a main control means for reducing titanium oxide inclusions in molten steel and improving the recovery rate of ferrotitanium. The following points are the main measures for improving the recovery rate of titanium.
Firstly, the selection of ferrotitanium species is optimized, and ferrotitanium recovery rate is improved by using intermediate alloys of TiFe70 and TiFe40 in combination with TiFe 70;
secondly, because the recovery rate of Ti is unstable, ferrotitanium is added under the condition of good deoxidation at the later stage of refining, the adding time of ferrotitanium is optimized, and the recovery rate is improved;
thirdly, blowing argon for 3min to enhance the melting effect of the ferrotitanium and improve the recovery rate of the ferrotitanium;
and fourthly, directly adding ferrotitanium by adopting a storage bin, so that the ferrotitanium recovery rate is improved, and the ferrotitanium recovery rate is improved from the original 30% to the average 55% at present.
Appropriate amount of calcium treatment operation
Firstly, in order to improve the recovery rate of ferrotitanium, proper amount of calcium treatment is carried out after ferrotitanium is added, and molten steel is stirred to be beneficial to melting ferrotitanium;
secondly, a proper amount of calcium treatment process can change the form of impurities in the molten steel and improve the castability of the molten steel;
thirdly, executing a proper amount of calcium treatment process, feeding a calcium iron wire into the molten steel for 150 meters per furnace, and controlling the calcium content within 0.0015 percent without influencing the welding use of users.
In the continuous casting process, the process of isolating molten steel from air throughout the process from a ladle to a mold is called non-oxidation casting. The continuous casting non-oxidation casting mainly comprises three aspects: firstly, protecting the liquid level of a steel ladle, a tundish and a crystallizer; secondly, protecting a ladle long nozzle and an invasive nozzle; thirdly, the long nozzle and the invasive nozzle are respectively connected with the ladleThe steel flow flows downwards at high speed during continuous casting to suck air, and the gap is sealed and protected. The pouring of the tundish adopts the argon sealing technology, and the furnace has good effect. When the pouring is started, air exists in the tundish, the steel ladle is poured and flows, and Al on the surface of a small amount of molten steel in the tundish is mixed with O in the air2Due to the higher oxygen potential, Al and Ti in the molten steel are oxidized into Al2O3、Titanium oxide inclusions, which are present in the tundish and the crystallizer and which have not come up in time, result in a flocculation flow in the tundish. A large amount of Al is found in molten steel2O3The secondary oxidation is serious when the surface of the inclusion begins to be poured, so that the inclusion generated by the secondary oxidation is effectively reduced after the tundish is adopted for blowing argon.
The biggest problem of continuous casting of titanium-containing wire steel is the agglomeration at the steel slag interface of the crystallizer, which is caused by the following reasons:
high-melting-point TiN generated in molten steel is gathered on a steel slag interface;
TiC with high melting point is gathered on a molten steel interface;
thirdly, TiN adsorbed on the surface of bubbles in the molten steel floats to a steel slag interface to form a steel-slag-bubble mixture;
after the TiN floating up to the interface is gathered, the TiN is crystallized with the TiN as a core to generate a mixture of TiN and iron beads. Therefore, the failure of the mold flux to absorb TiN is the cause of the mold flux agglomeration. The casting powder is agglomerated, so that the defects of slag inclusion and the like on the surface and under the skin of the titanium-containing casting blank are easily caused. The pulling speed is less than the subcutaneous slag inclusion amount within 2.3-2.4 m/min, the subcutaneous slag inclusion amount of the casting blank is increased along with the increase of the pulling speed after the pulling speed is increased, and the phenomenon that the pulling speed is almost not generated within 2.0-2.2 m/min.
TABLE 2 composition (wt%) of BZJ60-Ti welding wire steel ingot
| Examples | C | Si | Mn | P | S | V | Ti | B | Cr | Ca | O | N | Fe |
| 1 | 0.061 | 0.65 | 1.53 | 0.009 | 0.005 | 0.037 | 0.112 | 0.0033 | 0.37 | 0.0008 | 0.0034 | 0.0057 | Surplus |
| 2 | 0.073 | 0.71 | 1.56 | 0.009 | 0.006 | 0.039 | 0.103 | 0.0042 | 0.39 | 0.0008 | 0.0030 | 0.0051 | Surplus |
| 3 | 0.069 | 0.69 | 1.60 | 0.008 | 0.004 | 0.040 | 0.118 | 0.0036 | 0.43 | 0.0002 | 0.0027 | 0.0047 | Surplus |
| 4 | 0.068 | 0.65 | 1.51 | 0.011 | 0.005 | 0.046 | 0.091 | 0.0045 | 0.42 | 0.0009 | 0.0026 | 0.0046 | Surplus |
| 5 | 0.082 | 0.70 | 1.60 | 0.009 | 0.005 | 0.042 | 0.116 | 0.0043 | 0.47 | 0.0010 | 0.0023 | 0.0043 | Surplus |
| 6 | 0.070 | 0.68 | 1.59 | 0.016 | 0.005 | 0.038 | 0.083 | 0.0036 | 0.47 | 0.0006 | 0.0019 | 0.0040 | Surplus |
| 7 | 0.062 | 0.68 | 1.54 | 0.014 | 0.006 | 0.038 | 0.101 | 0.0042 | 0.39 | 0.0012 | 0.0013 | 0.0037 | Surplus |
| 8 | 0.062 | 0.67 | 1.57 | 0.013 | 0.005 | 0.040 | 0.101 | 0.0030 | 0.40 | 0.0008 | 0.0010 | 0.0032 | Surplus |
TABLE 3 microscopic Structure and non-metallic inclusions of BZJ60-Ti wire strand
Note: f-ferrite, P-pearlite
As shown in table 3 and fig. 1, the microstructure was uniform, the ferrite grain size was moderate, and the content of non-metallic inclusions was very small. It should be noted that such a texture, such as pure steel, is advantageous for subsequent wire drawing.
The results of the examples show that:
the production method has the advantages that the BZJ60-Ti welding wire steel adopts reasonable process routes and process control, and produced components and properties meet the enterprise and standard requirements and meet the use requirements of users.
⑵ through a series of research works on the production process flow, the wire steel industry batch production results show that the chemical composition and the casting blank quality of BZJ60-Ti wire steel completely meet the requirements, wherein the calcium content in the steel is 10 × 10-6The casting blank quality is good, and other inspection items meet the BYL 134-2013 standard requirement.
The production process is improved, the BZJ60-Ti welding wire steel is produced smoothly, and the maximum continuous casting heat is up to 6.
The BZJ60-Ti welding wire steel produced according to the prior art is excellent in drawing performance and welding performance, the drawing performance, the air holes performance, the crack resistance performance and the like meet the requirements of users, and the drawn welding wire is widely applied to welding engineering of large-size welding parts.
Claims (6)
1. The method for improving the quality of the wire steel casting blank is characterized in that the wire steel BZJ60-Ti comprises the following chemical components by mass percent:
c0.06-0.10; 0.60-0.90% of Si; 1.50-1.80 parts of Mn; p is less than or equal to 0.025; s is less than or equal to 0.020; v is 0.02-0.06; 0.08 to 0.13 Ti; b0.0025 to 0.005; 0.35-0.55% of Cr; ca is less than or equal to 0.0015; o is less than or equal to 0.004; n is less than or equal to 0.006; the balance being Fe.
2. The method for improving the quality of a wire strand according to claim 1, wherein the production route of BZJ60-Ti wire strand is: the mixer → the pretreatment of molten iron → 120 ton converter → the blowing of argon at the bottom of the ladle → the refining in the LF furnace → the continuous casting of square billets.
3. The method for improving the quality of a wire steel casting blank according to claim 2, wherein the ladle is clean and the previous furnace is not used for containing Al-containing and calcium-treated molten steel; silicon-manganese deoxidation alloying is adopted in the converter tapping process, and materials with high calcium and aluminum are added in the early stage of tapping to fully oxidize calcium and aluminum; in the converter tapping and LF furnace refining processes, materials containing high aluminum and calcium are strictly forbidden to be used for carrying out deoxidation, slagging and alloying processes; the LF refining strictly controls the content of [ Al ] in the molten steel, so that [ Alt ] is less than or equal to 0.007 wt%; the LF refining furnace ensures the fluidity of slag, controls the alkalinity of the slag to be less than or equal to 2.0 and effectively controls the form of inclusions.
4. The method for improving the quality of the wire steel casting blank according to claim 2, wherein an LF refining furnace adopts LF white slag operation, refining slag alkalinity control, argon blowing, ferrotitanium optimization and calcium treatment to control the purity and the castability of molten steel:
first LF white slag operation
The deoxidation of the LF furnace is realized by making white slag in the refining process, and the ferrosilicon powder is used for deoxidation, so that the aluminum-containing deoxidizer is avoided being used for increasing Al in steel2O3Carrying out inclusion;
the operation of blowing argon in LF process
The LF furnace argon blowing operation is that argon is blown into steel through a bottom argon blowing device of a ladle in the refining process to drive the molten steel to circulate, so that the aggregation and floating of inclusions are promoted by uniform components and temperature, and the control of non-metallic inclusions in BZJ60-Ti welding wire steel is better and is below level 1.0;
control of slag alkalinity of LF
CaO-SiO is adopted as basic slag of LF refining slag2-Al2O3The slag system with a low melting point of a ternary phase diagram is obtained, and the alkalinity of the slag is controlled to be less than or equal to 2.0;
optimization of titanium-iron alloy
Using ferrotitanium intermediate alloy TiFe70 or TiFe40 to match TiFe70, adding ferrotitanium in the late refining stage under the condition of good deoxidation, and blowing argon for 2-4 min after adding ferrotitanium;
operation of carrying out calcium treatment
Feeding a calcium iron wire into the molten steel at a rate of 150 m/furnace, wherein the calcium content is controlled within 0.0015 wt%.
5. The method for improving the quality of a cast strand of wire steel according to claim 2, wherein in the continuous casting process, the process of isolating the molten steel from the air is called non-oxidation casting throughout the entire process from the ladle to the mold; the continuous casting non-oxidation casting comprises three aspects: firstly, protecting the liquid level of a steel ladle, a tundish and a crystallizer; secondly, protecting a ladle long nozzle and an invasive nozzle; and thirdly, the long nozzle and the invasive nozzle are respectively connected with the lower nozzles of the ladle and the tundish, a gap exists at the joint, the gap is sealed and protected, and the argon sealing technology is adopted when the tundish is opened for casting.
6. The method for improving the quality of a wire steel casting blank according to claim 5, wherein the drawing speed of the continuous casting is 2.0 to 2.2 m/min.
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Application publication date: 20200929 |