CN114054697A - Production method of continuous casting billet and steel bar - Google Patents
Production method of continuous casting billet and steel bar Download PDFInfo
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- CN114054697A CN114054697A CN202111361377.6A CN202111361377A CN114054697A CN 114054697 A CN114054697 A CN 114054697A CN 202111361377 A CN202111361377 A CN 202111361377A CN 114054697 A CN114054697 A CN 114054697A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/108—Feeding additives, powders, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
The invention discloses a production method of a continuous casting billet and a steel bar, wherein the method comprises the following steps: preparing a first steel wire with a preset model; in the process of continuously casting the reinforcing steel bar with the preset model, feeding the first steel wire with the preset model into a crystallizer of a continuous casting machine at a first speed to obtain a casting blank; and cooling the casting blank to obtain a continuous casting billet with the area ratio of the central equiaxed crystal band being more than 10%, effectively enlarging the central equiaxed crystal band and achieving the purpose of improving the quality of the continuous casting billet.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a production method of a continuous casting small square billet and a steel bar.
Background
Continuous casting is to continuously cast liquid molten steel which is smelted into a solidified casting blank with a required size by adopting a continuous casting machine, and the continuous casting is a solidification process for converting steel from a liquid state to a solid state, and is an important link influencing the quality of steel. As is well known, during the solidification of molten steel, three casting blank structures, namely a surface fine crystal zone, a columnar crystal zone and a central equiaxed crystal zone, are formed on a casting blank from the top to the inside. The main characteristics of these three ribbons are as follows: 1. the surface fine crystal band is characterized in that: the crystal grains are fine, the microscopic holes are few, the chemical components are uniform, the subsequent heating and rolling are facilitated, and the mechanical property after hot rolling is also very excellent; 2. the columnar crystal band is characterized in that: the growth of the crystal grains has obvious directionality, the crystal grains are coarse, microscopic cavities exist among the columnar crystals, the segregation of chemical components is also serious under the influence of the crystals, and the crystal band is the crystal band with the worst performance; 3. the central equiaxed zone is characterized in that: the grain growth has no directionality, the grain size is considered between the surface fine crystal band and the columnar crystal band, the chemical composition segregation is smaller than that of the columnar crystal band, and the performance of the crystal band is between the surface fine crystal band and the columnar crystal band.
In view of the characteristics and properties of the three kinds of crystal bands, one of the main tasks of the continuous casting process is to reduce the area of the columnar crystal bands and enlarge the areas of the surface fine crystal bands and the central equiaxial crystal bands, and the surface fine crystal bands are generally difficult to enlarge due to the limitation of the cooling strength of the continuous casting machine, so that the important research point in the field of steel production is how to enlarge the central equiaxial crystal bands and correspondingly reduce the areas of the columnar crystal bands.
At present, in Shanghai metal, No. 41, No. 4 of 7.2019, pp.75-79, the literature data of the research on improving the quality of continuous casting billets by applying crystallizer PMO is used for carrying out experimental research on improving the internal quality of deformed steel bars by crystallizer Pulsed Magnetic Oscillation (PMO) in order to solve the internal quality problems of low equiaxial crystal rate, serious central carbon segregation, central porosity, shrinkage cavity and the like existing in the continuous casting process of deformed steel billets of HRB400EG in a certain factory. The result shows that the PMO crystallizer can obviously refine the solidification structure of the deformed steel bar, expand the range of a central equiaxed zone and reduce the spacing of secondary dendritic crystal arms.
However, in the above research, "the research on improving the quality of the continuous casting billet by applying the PMO of the crystallizer" can obviously improve the structure of the cast billet by applying the Pulse Magnetic Oscillation (PMO) in the crystallizer, and enlarge the range of the equiaxed zone in the center, but the application of the pulse magnetic oscillation technology requires the installation of special equipment in the crystallizer, and is limited to the popularization and application in general steel mills.
Therefore, how to enlarge a central equiaxed crystal belt and improve the quality of a continuous casting billet becomes a problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problem in the prior art, the invention provides a production method of a continuous casting billet and a steel bar, which enlarge a central equiaxed zone and achieve the purpose of improving the quality of the continuous casting billet.
The invention is realized by the following technical scheme:
according to the present invention, there is provided a method of producing a continuously cast billet, which may comprise:
preparing a first steel wire with a preset model;
in the process of continuously casting the reinforcing steel bar with the preset model, feeding the first steel wire with the preset model into a crystallizer of a continuous casting machine at a first speed to obtain a casting blank;
and cooling the casting blank to obtain a continuous casting billet with the area ratio of the central equiaxial crystal band larger than 10%.
In some implementations, preparing a predetermined gauge of the first steel wire includes:
drawing a preset type of smooth disc strip with a first diameter to a first steel wire with a second diameter by adopting a drawing process, wherein the first diameter is larger than the second diameter;
heating the first steel wire with the second diameter to 750 ℃, heating up at a speed of 10 ℃/min, keeping the temperature for 1h, cooling to 500 ℃ with the furnace, cooling down at a speed of 1.67 ℃/min, keeping the temperature for 1h, and air-cooling to room temperature;
and coiling the cooled first steel wire with the preset model and the second diameter into a disc.
In some implementations, the first diameter is 6.0 mm-10.0 mm; the second diameter is phi 3 mm-phi 5 mm.
In some implementations, the hardness values of the predetermined type of the first steel wire of the second diameter are HBW 2.5/187.5 ≦ 180, HBW 2.5/187.5 ≦ 190, and HBW 2.5/187.5 ≦ 200, respectively.
In some implementations, in the process of continuously casting a predetermined type of steel bar, feeding a predetermined type of first steel wire into a mold of a continuous casting machine at a first speed to obtain a cast slab, including:
when a continuous casting machine pours molten steel to smelt steel bar steel of a preset model, controlling the superheat degree of the molten steel in continuous casting within the range of 10-60 ℃;
selecting a target diameter of a first steel wire of a preset model according to the size of a casting blank:
feeding a first steel wire with a preset type and a target diameter into a crystallizer to obtain a casting blank; wherein the first speed is related to the casting blank drawing speed and the superheat degree.
In some implementations, selecting a target diameter of a preset type of first wire according to a casting blank size includes:
if the size of the casting blank is not more than 150mm multiplied by 150mm, selecting the target diameter phi 3 mm;
if the size of the casting blank is 160mm multiplied by 160 mm-190 mm multiplied by 190mm, the target diameter is selected to be phi 4 mm;
if the size of the casting blank is more than or equal to 200mm multiplied by 200mm, the target diameter is selected to be phi 5 mm.
In some implementations, the first speed may be 5.0-15.0m/min when the billet pull rate is not less than 0.5 m/min.
In some implementations, the first velocity is related to a billet pull rate and a superheat degree, including:
the casting blank drawing speed is less than 0.5m/min, and the first speed is 0;
the casting blank drawing speed is 0.5-1.5m/min, the superheat degree of molten steel is within the range of 10-30 ℃, and the first speed is 5.0-8.0 m/min;
the casting blank drawing speed is 0.5-1.5m/min, the superheat degree of molten steel is within the range of 31-60 ℃, and the first speed is 8.1-12.0 m/min;
the casting blank drawing speed is more than 1.5m/min, the superheat degree of molten steel is within the range of 10-30 ℃, and the first speed is 8.1-12.0 m/min;
the casting blank drawing speed is more than 1.5m/min, the superheat degree of molten steel is within the range of 31-60 ℃, and the first speed is 12.1-15.0 m/min.
In some implementations, the preset model includes HRB400E, HRB500E, or HRB 600.
According to the invention, the reinforced steel is prepared by the production method of the continuous casting billet, and specifically comprises the following steps:
preparing a first steel wire with a preset model;
in the process of continuously casting the reinforcing steel bar with the preset model, feeding the first steel wire with the preset model into a crystallizer of a continuous casting machine at a first speed to obtain a casting blank;
and cooling the casting blank to obtain a continuous casting billet with the area ratio of the central equiaxial crystal band larger than 10%.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the embodiment of the invention, the first steel wire with the preset model is prepared. In the process of continuously casting the reinforcing steel bar with the preset model, feeding the first steel wire with the preset model into a crystallizer of a continuous casting machine at a first speed to obtain a casting blank. And cooling the casting blank to obtain a continuous casting billet with the area ratio of the central equiaxed crystal band being more than 10%, effectively enlarging the central equiaxed crystal band and achieving the purpose of improving the quality of the continuous casting billet.
Drawings
Fig. 1 shows a schematic flow diagram of a method for producing continuous casting billets according to the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a production method of a continuous casting billet. As shown in fig. 1, the method for producing a continuous casting billet according to the present invention may comprise:
s101, preparing a first steel wire with a preset model.
The preset model may include HRB400E, HRB500E, or HRB 600.
In a specific implementation manner, S101 may specifically be:
s1011, drawing the preset-type smooth disc strip with the first diameter to a first steel wire with the second diameter by adopting a drawing process.
Wherein the first diameter is greater than the second diameter.
In a particular implementation, the first diameter may be between 6.0mm and 10.0 mm. The second diameter may be from 3mm phi to 5mm phi.
In a particularly implementable manner, the first diameter may be 6.0mm, 6.1mm, 6.2mm, 6.5mm, 6.7mm, 6.9mm, 7.0mm, 7.5mm, 7.8mm, 7.9mm, 8.0mm, 8.1mm, 8.3mm, 8.5mm, 8.8mm, 8.9mm, 9.6mm or 10.0 mm.
In a particularly implementable manner, the second diameter may be 3mm, 3.1mm, 3.3mm, 3.5mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.6mm, 4.8mm, 4.9mm or 5 mm.
S1012, heating the first steel wire with the second diameter to 750 ℃, heating up at a speed of 10 ℃/min, keeping the temperature for 1h, cooling to 500 ℃ along with the furnace, cooling down at a speed of 1.67 ℃/min, keeping the temperature for 1h, and air-cooling to room temperature.
And S1013, coiling the cooled first steel wire with the preset model and the second diameter into a disc.
Wherein the hardness values of the first steel wires with the preset type and the second diameter are respectively HBW 2.5/187.5 to 180, HBW 2.5/187.5 to 190 and HBW 2.5/187.5 to 200.
S102, in the process of continuously casting the reinforcing steel bars with preset models, feeding the first steel wires with preset models into a crystallizer of a continuous casting machine at a first speed to obtain a casting blank.
In a specific implementation manner, S102 may specifically be:
s1021, when the continuous casting machine pours molten steel to smelt steel bar steel of a preset model, controlling the superheat degree of the molten steel in continuous casting within the range of 10-60 ℃;
s1022, selecting a target diameter of a first steel wire with a preset model according to the size of a casting blank;
wherein the target diameter may be phi 3 mm-phi 5 mm.
S1023, feeding a first steel wire with a preset type and a target diameter into a crystallizer to obtain a casting blank; wherein the first speed is related to the casting blank drawing speed and the superheat degree.
In a concrete implementation manner, selecting a target diameter of a preset type of the first steel wire according to a size of a casting blank may include: if the size of the casting blank is not more than 150mm multiplied by 150mm, the target diameter is selected to be phi 3 mm.
In a concrete implementation manner, selecting a target diameter of a preset type of the first steel wire according to a size of a casting blank may include: if the size of the casting blank is 160mm multiplied by 160mm to 190mm multiplied by 190mm, the target diameter is selected to be phi 4 mm.
In a concrete implementation manner, selecting a target diameter of a preset type of the first steel wire according to a size of a casting blank may include: if the size of the casting blank is more than or equal to 200mm multiplied by 200mm, the target diameter is selected to be phi 5 mm.
In a particular implementation, the first speed may be 5.0-15.0m/min when the casting speed is not less than 0.5 m/min.
In one particular implementation, the first speed is related to the casting blank drawing speed and the superheat degree, and may include: the casting blank drawing speed is less than 0.5m/min, and the first speed is 0.
In one particular implementation, the first speed is related to the casting blank drawing speed and the superheat degree, and may include: the casting blank drawing speed is 0.5-1.5m/min, the superheat degree of molten steel is within the range of 10-30 ℃, and the first speed is 5.0-8.0 m/min.
In one particular implementation, the first speed is related to the casting blank drawing speed and the superheat degree, and may include: the casting blank drawing speed is 0.5-1.5m/min, the superheat degree of molten steel is within the range of 31-60 ℃, and the first speed is 8.1-12.0 m/min.
In one particular implementation, the first speed is related to the casting blank drawing speed and the superheat degree, and may include: the casting blank drawing speed is more than 1.5m/min, the superheat degree of molten steel is within the range of 10-30 ℃, and the first speed is 8.1-12.0 m/min.
In one particular implementation, the first speed is related to the casting blank drawing speed and the superheat degree, and may include: the casting blank drawing speed is more than 1.5m/min, the superheat degree of molten steel is within the range of 31-60 ℃, and the first speed is 12.1-15.0 m/min.
And S103, cooling the casting blank to obtain a continuous casting billet with the central equiaxial zone area ratio of more than 10%.
According to the embodiment of the invention, the first steel wire with the preset model is prepared. In the process of continuously casting the reinforcing steel bar with the preset model, feeding the first steel wire with the preset model into a crystallizer of a continuous casting machine at a first speed to obtain a casting blank. And cooling the casting blank to obtain a continuous casting billet with the area ratio of the central equiaxed crystal band being more than 10%, effectively enlarging the central equiaxed crystal band and achieving the purpose of improving the quality of the continuous casting billet.
Hereinafter, the production method of the continuous casting billet according to the present invention will be specifically described with reference to examples.
Example 1
In a certain steel plant, HRB400E wire rods with the chemical components (weight percentage) of 0.22% C, 0.42% Si, 1.35% Mn, 0.025% P, 0.032% S and 0.03% V and the diameter of phi 6.0mm are entrusted to a drawing plant to be completely drawn into steel wires with the diameter of phi 3mm, then the steel wires with the diameter of phi 3mm are heated from room temperature to 750 ℃ at the heating rate of 10 ℃/min, the heat preservation time is 1h, then the steel wires with the diameter of phi 3mm are cooled to 500 ℃ along with a furnace at the cooling rate of 1.67 ℃/min, the heat preservation time is 1h, then the steel wires are discharged from the furnace, finally the steel wires are cooled to the room temperature, the hardness value HBW 2.5/187.5 is 178, and the steel wires with the diameter of phi 3mm are continuously cast as raw materials for subsequently producing HRB 400E.
HRB400E is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.23% of C, 0.40% of Si, 1.38% of Mn, 0.020% of P, 0.028% of S and 0.03% of V (meeting the requirements of GB/T1499.2-2018), HRB400E molten steel is poured into a casting blank of 150mm x 150mm on a 6-machine 6-flow 150mm x 150mm billet caster. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 10 ℃ during pouring; the casting blank drawing speed is 2.5m/min, the crystallizer is electromagnetically stirred for 300A/3Hz, steel wires with actually measured hardness values HBW 2.5/187.5 being 178 and the diameter being phi 3mm are fed into the 1 st, 2 nd and 3 rd flow crystallizers of a 6-machine 6-flow continuous casting machine at the speed of 10.0m/min by adopting a wire feeding machine, after the casting blanks are cooled, low-power samples with the length being 10mm are cut from the 150mm multiplied by 150mm casting blanks of the 1 st, 2 nd and 3 th flows, the obtained low-power samples are graded and measured according to the method specified by GB/T24178 continuous casting billet solidification structure low-power grading method, and the area percentage of equiaxial crystal belts at the centers of the low-power samples obtained by the 1 st, 2 nd and 3 th flows accounts for 16.0%, 14.5% and 13.0% of the whole test surface of the samples.
Comparative example 1
The comparative example was the same furnace as example 1, and only in the casting of the molten steel, the present technique was applied to the flows 1, 2 and 3 on the 150mm × 150mm billet caster with 6 flows, and the present technique was not applied to the flows 4, 5 and 6.
HRB400E is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.23% of C, 0.40% of Si, 1.38% of Mn, 0.020% of P, 0.028% of S and 0.03% of V (meeting the requirements of GB/T1499.2-2018), HRB400E molten steel is poured into a casting blank of 150mm x 150mm on a 6-machine 6-flow 150mm x 150mm billet caster. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 10 ℃ during pouring; the casting blank drawing speed is 2.5m/min, the crystallizer is electromagnetically stirred for 300A/3Hz, steel wires with the diameter of phi 3mm are not fed into the 4 th, 5 th and 6 th flow crystallizers of the 6-machine 6-flow continuous casting machine, after the casting blank is cooled, low-power samples with the length of 10mm are cut from the 150mm multiplied by 150mm casting blanks of the 4 th, 5 th and 6 th flows, the obtained low-power samples are graded and measured according to the method specified in GB/T24178 'continuous casting billet solidification structure low-power rating method', and the area percentages of equiaxial crystal bands at the centers of the low-power samples obtained by the 4 th, 5 th and 6 th flows account for 8.0%, 9.5% and 7.5% of the whole test surface of the samples.
Example 2
In a certain steel plant, HRB500E wire rods with the chemical components (weight percentage) of 0.23% C, 0.45% Si, 1.34% Mn, 0.020% P, 0.025% S and 0.07% V and the diameter of 8.0mm are entrusted to a drawing plant to be completely drawn into steel wires with the diameter of 4mm, then the steel wires with the diameter of 4mm are heated from room temperature to 750 ℃ at the temperature rising speed of 10 ℃/min, the heat preservation time is 1h, then the steel wires are cooled to 500 ℃ along with the furnace at the temperature falling speed of 1.67 ℃/min, the heat preservation time is 1h, then the steel wires are taken out of the furnace, finally the steel wires are air-cooled to the room temperature, the hardness value HBW 2.5/187.5 is 185, and the steel wires with the diameter of 4mm are taken as the raw materials for the subsequent continuous casting production of HRB500E for standby.
HRB500E is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.21% of C, 0.45% of Si, 1.42% of Mn, 0.021% of P, 0.029% of S and 0.07% of V (meeting the requirements of GB/T1499.2-2018), the HRB500E molten steel is poured into a casting blank of 160mm x 160mm on a 6-machine 6-flow small square billet continuous casting machine of 160mm x 160 mm. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 60 ℃ during pouring; the casting blank drawing speed is 2.4m/min, the crystallizer is electromagnetically stirred for 300A/3Hz, steel wires with the actually measured hardness value HBW 2.5/187.5 being 185 and the diameter being phi 4mm are fed into the 1 st, 2 nd and 3 rd flow crystallizers of a 6-machine 6-flow continuous casting machine at the speed of 15.0m/min by adopting a wire feeding machine, after the casting blanks are cooled, low-power samples with the length being 10mm are cut from the 160mm multiplied by 160mm casting blanks of the 1 st, 2 nd and 3 th flows, the obtained low-power samples are graded and measured according to the method specified by GB/T24178 continuous casting billet solidification structure low-power grading method, and the area percentage of equiaxial crystal belts at the centers of the low-power samples obtained by the 1 st, 2 nd and 3 th flows accounts for 10.5%, 10.0% and 11.5% of the whole test surface of the samples.
In the implementation, the superheat degree of the tundish molten steel in continuous casting reaches 60 ℃ during casting, the continuous casting tundish molten steel belongs to the high-temperature casting category, the quality of a continuous casting blank is quite unfavorable, in order to counteract the adverse effect of high-temperature casting on the quality, the highest wire feeding speed of 15.0m/min is selected within the wire feeding speed range of 12.1-15.0m/min, the area percentage of an isometric crystal zone in the center of the casting blank after being cooled is still more than 10.0%, and the casting blank quality is obviously improved.
Comparative example 2
The comparative example was the same furnace as example 2, and only in the casting of the molten steel, the present technique was applied to the 6-machine 6-flow 160mm by 160mm billet caster for the 1, 2 and 3 flows, and the present technique was not applied to the 4, 5 and 6 flows.
HRB500E is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.21% of C, 0.45% of Si, 1.42% of Mn, 0.021% of P, 0.029% of S and 0.07% of V (meeting the requirements of GB/T1499.2-2018), the HRB500E molten steel is poured into a casting blank of 160mm x 160mm on a 6-machine 6-flow small square billet continuous casting machine of 160mm x 160 mm. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 60 ℃ during pouring; the casting blank drawing speed is 2.4m/min, the electromagnetic stirring of the crystallizer is 300A/3Hz, steel wires with the diameter of phi 4mm are not fed into the 4 th, 5 th and 6 th flow crystallizers of the 6-machine 6-flow continuous casting machine, after the casting blank is cooled, low-power samples with the length of 10mm are cut from the 160mm multiplied by 160mm casting blanks of the 4 th, 5 th and 6 th flows, the obtained low-power samples are graded and measured according to the method specified in GB/T24178 'continuous casting billet solidification structure low-power grading method', and the area percentages of isometric crystal bands at the centers of the low-power samples obtained by the 4 th, 5 th and 6 th flows, which account for the whole test surface of the samples, are measured to be 0 percent, 5.0 percent and 3.0 percent.
The superheat degree of the tundish molten steel in continuous casting reaches 60 ℃ during casting of the comparative example, the method belongs to the high-temperature casting category, and is very unfavorable for the quality of a continuous casting blank, wherein a 4-flow casting blank has a state that an equiaxial crystal zone without a center is formed, a columnar crystal zone extends to the center of the casting blank, the casting blank in the state is easy to have obvious holes in the center of the section, and crack defects are easy to occur in the quarter of the section of the casting blank.
Example 3
In a certain steel plant, HRB600 wire rods with the chemical components (weight percentage) of 0.26% C, 0.70% Si, 1.51% Mn, 0.027% P, 0.020% S and 0.12% V and the diameter of phi 10.0mm are assigned to a drawing plant to be drawn into steel wires with the diameter of phi 5mm, then the steel wires with the diameter of phi 5mm are heated to 750 ℃ from room temperature at the heating rate of 10 ℃/min, the temperature is kept for 1h, then the steel wires are cooled to 500 ℃ along with the furnace at the cooling rate of 1.67 ℃/min, the temperature is kept for 1h, then the steel wires are taken out of the furnace, finally the steel wires are air-cooled to the room temperature, the hardness value HBW 2.5/187.5 is measured to be 192, and the steel wires with the diameter of phi 5mm are taken as raw materials for the subsequent continuous casting production of HRB600 for standby.
HRB600 is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.26 percent of C, 0.71 percent of Si, 1.52 percent of Mn, 0.029 percent of P, 0.022 percent of S and 0.12 percent of V (meeting the requirements of GB/T1499.2-2018), the HRB600 molten steel is poured into a casting blank of 200mm x 200mm on a 6-machine 6-flow small square billet continuous casting machine of 200mm x 200 mm. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 35 ℃ during pouring; the casting blank drawing speed is 1.6m/min, the crystallizer is electromagnetically stirred for 200A/3Hz, steel wires with the actually measured hardness value HBW 2.5/187.5 being 192 and the diameter being phi 5mm are fed into the 1 st, 2 nd and 3 rd flow crystallizers of a 6-machine 6-flow continuous casting machine at the speed of 12.1m/min by adopting a wire feeding machine, after the casting blanks are cooled, low-power samples with the length being 10mm are cut off from the 200mm multiplied by 200mm casting blanks of the 1 st, 2 nd and 3 th flows, the obtained low-power samples are graded and measured according to the method specified by GB/T24178 'continuous casting billet solidification structure low-power grading method', and the area percentage of equiaxial crystal belts at the centers of the low-power samples obtained by the 1 st, 2 nd and 3 th flows accounts for 16.5%, 14.0% and 15.5% of the whole test surface of the samples.
Comparative example 3
This comparative example was the same furnace as example 3, and only during the casting of the molten steel, the present technique was applied to the flows 1, 2 and 3 on the 200mm x 200mm billet caster with 6 flows, and the present technique was not applied to the flows 4, 5 and 6.
HRB600 is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.26 percent of C, 0.71 percent of Si, 1.52 percent of Mn, 0.029 percent of P, 0.022 percent of S and 0.12 percent of V (meeting the requirements of GB/T1499.2-2018), the HRB600 molten steel is poured into a casting blank of 200mm x 200mm on a 6-machine 6-flow small square billet continuous casting machine of 200mm x 200 mm. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 35 ℃ during pouring; the casting blank drawing speed is 1.6m/min, the crystallizer is electromagnetically stirred for 200A/3Hz, steel wires with the diameter of phi 4mm are not fed into the 4 th, 5 th and 6 th flow crystallizers of the 6-machine 6-flow continuous casting machine, after the casting blank is cooled, low-power samples with the length of 10mm are cut from the 4 th, 5 th and 6 th flow 200mm multiplied by 200mm casting blanks, the obtained low-power samples are graded and measured according to a method specified in GB/T24178 'continuous casting billet solidification structure low-power rating method', and the area percentages of isometric crystal bands at the centers of the low-power samples obtained from the 4 th, 5 th and 6 th flows account for 11.0%, 12.0% and 9.0% of the whole test surface of the samples are measured.
Example 4
In a certain steel plant, HRB400E wire rods with the chemical components (weight percentage) of 0.22% C, 0.42% Si, 1.35% Mn, 0.025% P, 0.032% S and 0.03% V and the diameter of phi 6.0mm are entrusted to a drawing plant to be completely drawn into steel wires with the diameter of phi 3mm, then the steel wires with the diameter of phi 3mm are heated from room temperature to 750 ℃ at the heating rate of 10 ℃/min, the heat preservation time is 1h, then the steel wires with the diameter of phi 3mm are cooled to 500 ℃ along with a furnace at the cooling rate of 1.67 ℃/min, the heat preservation time is 1h, then the steel wires are discharged from the furnace, finally the steel wires are cooled to the room temperature, the hardness value HBW 2.5/187.5 is 178, and the steel wires with the diameter of phi 3mm are continuously cast as raw materials for subsequently producing HRB 400E.
HRB400E is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.20% of C, 0.44% of Si, 1.32% of Mn, 0.021% of P, 0.023% of S and 0.035% of V (meeting the requirements of GB/T1499.2-2018), the HRB400E molten steel is poured into a casting blank of 150mm x 150mm on a small square billet continuous casting machine of 150mm x 150mm flowing in 6 machines. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 25 ℃ during pouring; the casting blank drawing speed is 1.0m/min, the crystallizer is electromagnetically stirred for 300A/3Hz, steel wires with actually measured hardness values HBW 2.5/187.5 of 178 and the diameter of phi 3mm are fed into the 1 st, 2 nd and 3 rd flow crystallizers of a 6-machine 6-flow continuous casting machine at the speed of 5.0m/min by adopting a wire feeding machine, after the casting blanks are cooled, low-power samples with the length of 10mm are cut from the 150mm multiplied by 150mm casting blanks of the 1 st, 2 nd and 3 th flows, the obtained low-power samples are graded and measured according to the method specified by GB/T24178 continuous casting billet solidification structure low-power grading method, and the area percentage of equiaxial crystal belts at the centers of the low-power samples obtained by the 1 st, 2 nd and 3 th flows accounts for 15.0%, 13.5% and 14.5% of the whole test surface of the samples.
Comparative example 4
This comparative example was the same furnace as example 4, and only during the casting of the molten steel, the present technique was applied to the flows 1, 2 and 3 on the 150mm × 150mm billet caster with 6 flows, and the present technique was not applied to the flows 4, 5 and 6.
HRB400E is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.20% of C, 0.44% of Si, 1.32% of Mn, 0.021% of P, 0.023% of S and 0.035% of V (meeting the requirements of GB/T1499.2-2018), the HRB400E molten steel is poured into a casting blank of 150mm x 150mm on a small square billet continuous casting machine of 150mm x 150mm flowing in 6 machines. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 25 ℃ during pouring; the casting blank drawing speed is 1.0m/min, the crystallizer is electromagnetically stirred for 300A/3Hz, steel wires with the diameter of phi 3mm are not fed into the 4 th, 5 th and 6 th flow crystallizers of the 6-machine 6-flow continuous casting machine, after the casting blank is cooled, low-power samples with the length of 10mm are cut from the 150mm multiplied by 150mm casting blanks of the 4 th, 5 th and 6 th flows, the obtained low-power samples are graded and measured according to the method specified in GB/T24178 'continuous casting billet solidification structure low-power rating method', and the area percentages of equiaxial crystal bands at the centers of the low-power samples obtained by the 4 th, 5 th and 6 th flows, which account for the whole test surface of the samples, are measured to be 9.0%, 10.0% and 9.5%.
Example 5
In a certain steel plant, HRB500E wire rods with the chemical components (weight percentage) of 0.23% C, 0.45% Si, 1.34% Mn, 0.020% P, 0.025% S and 0.07% V and the diameter of 8.0mm are entrusted to a drawing plant to be completely drawn into steel wires with the diameter of 4mm, then the steel wires with the diameter of 4mm are heated from room temperature to 750 ℃ at the temperature rising speed of 10 ℃/min, the heat preservation time is 1h, then the steel wires are cooled to 500 ℃ along with the furnace at the temperature falling speed of 1.67 ℃/min, the heat preservation time is 1h, then the steel wires are taken out of the furnace, finally the steel wires are air-cooled to the room temperature, the hardness value HBW 2.5/187.5 is 185, and the steel wires with the diameter of 4mm are taken as the raw materials for the subsequent continuous casting production of HRB500E for standby.
HRB500E is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.23% of C, 0.50% of Si, 1.46% of Mn, 0.030% of P, 0.021% of S and 0.075% of V (meeting the requirements of GB/T1499.2-2018), HRB500E molten steel is poured into a casting blank of 160mm x 160mm on a 6-machine 6-flow small square billet continuous casting machine of 160mm x 160 mm. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 28 ℃ during pouring; the casting blank drawing speed is 1.1m/min, the crystallizer is electromagnetically stirred for 300A/3Hz, steel wires with the actually measured hardness value HBW 2.5/187.5 being 185 and the diameter being phi 4mm are fed into the 1 st, 2 nd and 3 rd flow crystallizers of a 6-machine 6-flow continuous casting machine at the speed of 7.0m/min by adopting a wire feeding machine, after the casting blanks are cooled, low-power samples with the length being 10mm are cut from the 160mm multiplied by 160mm casting blanks of the 1 st, 2 nd and 3 th flows, the obtained low-power samples are graded and measured according to the method specified by GB/T24178 continuous casting billet solidification structure low-power grading method, and the area percentage of equiaxial crystal belts at the centers of the low-power samples obtained by the 1 st, 2 nd and 3 th flows accounts for 13.5%, 10.0% and 14.5% of the whole test surface of the samples.
Comparative example 5
This comparative example was the same furnace as example 5, and only during the casting of the molten steel, the present technique was applied to the 6-machine 6-stream 160mm x 160mm billet caster for streams 1, 2 and 3, and not to streams 4, 5 and 6.
HRB500E is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.23% of C, 0.50% of Si, 1.46% of Mn, 0.030% of P, 0.021% of S and 0.075% of V (meeting the requirements of GB/T1499.2-2018), HRB500E molten steel is poured into a casting blank of 160mm x 160mm on a 6-machine 6-flow small square billet continuous casting machine of 160mm x 160 mm. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 28 ℃ during pouring; the casting blank drawing speed is 1.1m/min, the electromagnetic stirring of the crystallizer is 300A/3Hz, steel wires with the diameter of phi 4mm are not fed into the 4 th, 5 th and 6 th flow crystallizers of the 6-machine 6-flow continuous casting machine, after the casting blank is cooled, low-power samples with the length of 10mm are cut from the 160mm multiplied by 160mm casting blanks of the 4 th, 5 th and 6 th flows, the obtained low-power samples are graded and measured according to the method specified in GB/T24178 'continuous casting billet solidification structure low-power grading method', and the area percentages of isometric crystal bands at the centers of the low-power samples obtained by the 4 th, 5 th and 6 th flows account for 8.2%, 7.5% and 4.0% of the whole test surface of the samples.
Example 6
In a certain steel plant, HRB600 wire rods with the chemical components (weight percentage) of 0.26% C, 0.70% Si, 1.51% Mn, 0.027% P, 0.020% S and 0.12% V and the diameter of phi 10.0mm are entrusted to a drawing plant to be completely drawn into steel wires with the diameter of phi 5mm, then the steel wires with the diameter of phi 5mm are heated to 750 ℃ from room temperature at the heating rate of 10 ℃/min, the heat preservation time is 1h, then the steel wires are cooled to 500 ℃ along with the furnace at the cooling rate of 1.67 ℃/min, the heat preservation time is 1h, then the steel wires are taken out of the furnace, finally the steel wires are air-cooled to the room temperature, the hardness value HBW 2.5/187.5 is determined to be 192, and the steel wires with the diameter of phi 5mm are taken as the raw materials for the subsequent continuous casting production of HRB600 for standby.
HRB600 is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.26 percent of C, 0.71 percent of Si, 1.52 percent of Mn, 0.029 percent of P, 0.022 percent of S and 0.12 percent of V (meeting the requirements of GB/T1499.2-2018), the HRB600 molten steel is poured into a casting blank of 200mm x 200mm on a 6-machine 6-flow small square billet continuous casting machine of 200mm x 200 mm. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 50 ℃ during pouring; the casting blank drawing speed is 0.5m/min, the crystallizer is electromagnetically stirred for 200A/3Hz, steel wires with the actually measured hardness value HBW 2.5/187.5 being 192 and the diameter being phi 5mm are fed into the 1 st, 2 nd and 3 rd flow crystallizers of a 6-machine 6-flow continuous casting machine at the speed of 8.1m/min by adopting a wire feeding machine, after the casting blanks are cooled, low-power samples with the length being 10mm are cut off from the 200mm multiplied by 200mm casting blanks of the 1 st, 2 nd and 3 th flows, the obtained low-power samples are graded and measured according to the method specified by GB/T24178 'continuous casting billet solidification structure low-power grading method', and the area percentage of equiaxial crystal belts at the centers of the low-power samples obtained by the 1 st, 2 nd and 3 th flows accounts for 15.5%, 12.5% and 13.5% of the whole test surface of the samples.
Comparative example 6
This comparative example was the same furnace as example 6, and only during the casting of the molten steel, the present technique was applied to the flows 1, 2 and 3 on the 200mm x 200mm billet caster with 6 flows, and the present technique was not applied to the flows 4, 5 and 6.
HRB600 is smelted by adopting a 120-ton converter and an LF furnace, when the chemical components of molten steel are 0.26 percent of C, 0.71 percent of Si, 1.52 percent of Mn, 0.029 percent of P, 0.022 percent of S and 0.12 percent of V (meeting the requirements of GB/T1499.2-2018), the HRB600 molten steel is poured into a casting blank of 200mm x 200mm on a 6-machine 6-flow small square billet continuous casting machine of 200mm x 200 mm. Controlling the superheat degree of the molten steel of the tundish in continuous casting to be 50 ℃ during pouring; the casting blank drawing speed is 0.5m/min, the crystallizer is electromagnetically stirred for 200A/3Hz, steel wires with the diameter of phi 5mm are not fed into the 4 th, 5 th and 6 th flow crystallizers of the 6-machine 6-flow continuous casting machine, after the casting blank is cooled, low-power samples with the length of 10mm are cut from the 4 th, 5 th and 6 th flow 200mm multiplied by 200mm casting blanks, the obtained low-power samples are graded and measured according to the method specified in GB/T24178 'continuous casting billet solidification structure low-power rating method', and the area percentages of isometric crystal bands at the centers of the low-power samples obtained from the 4 th, 5 th and 6 th flows account for 9.0%, 10.0% and 11.0% of the whole test surface of the samples are measured.
The above examples only express embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for producing a continuous casting billet, characterized in that it comprises:
preparing a first steel wire with a preset model;
in the process of continuously casting the reinforcing steel bar with the preset model, feeding the first steel wire with the preset model into a crystallizer of a continuous casting machine at a first speed to obtain a casting blank;
and cooling the casting blank to obtain a continuous casting billet with the area ratio of the central equiaxial crystal band larger than 10%.
2. The method for producing a continuously cast billet according to claim 1, wherein the preparing a first steel wire of a predetermined type comprises:
drawing the preset-type optical disc strips with the first diameter to the first steel wire with the second diameter by adopting a drawing process, wherein the first diameter is larger than the second diameter;
heating the first steel wire with the second diameter to 750 ℃, heating up at a speed of 10 ℃/min, keeping the temperature for 1h, cooling to 500 ℃ with the furnace, cooling down at a speed of 1.67 ℃/min, keeping the temperature for 1h, and air-cooling to room temperature;
and coiling the cooled first steel wire with the preset type and the second diameter into a disc.
3. The method for producing a continuous casting billet according to claim 2,
the first diameter is phi 6.0 mm-phi 10.0 mm; the second diameter is phi 3 mm-phi 5 mm.
4. The method for producing a continuous casting billet according to claim 2,
the hardness values of the first steel wires with the preset type and the second diameter are respectively HBW 2.5/187.5 to 180, HBW 2.5/187.5 to 190 and HBW 2.5/187.5 to 200.
5. The method for producing a continuous casting billet according to claim 1,
in the process of continuously casting the reinforcing steel bar with the preset model, feeding the first steel wire with the preset model into a crystallizer of a continuous casting machine at a first speed to obtain a casting blank, wherein the casting blank comprises the following steps:
when the steel bar steel of the preset model is smelted by pouring molten steel in a continuous casting machine, controlling the superheat degree of the molten steel in continuous casting within the range of 10-60 ℃;
selecting the target diameter of the first steel wire of the preset model according to the size of the casting blank:
feeding the first steel wire with the preset type and the target diameter into a crystallizer to obtain a casting blank; wherein the first speed is related to the casting blank drawing speed and the superheat degree.
6. The method for producing a continuously cast billet according to claim 5 wherein selecting a target diameter of the first wire of the preset type according to the billet size comprises:
if the size of the casting blank is not more than 150mm multiplied by 150mm, selecting the target diameter to be phi 3 mm;
if the size of the casting blank is 160mm multiplied by 160 mm-190 mm multiplied by 190mm, selecting the target diameter to be phi 4 mm;
and if the size of the casting blank is more than or equal to 200mm multiplied by 200mm, selecting the target diameter to be phi 5 mm.
7. The method of producing a continuously cast billet according to claim 5 wherein the first speed is 5.0 to 15.0m/min when the strand casting speed is not less than 0.5 m/min.
8. The method of producing a continuously cast billet as claimed in claim 7 in which the first speed is related to billet pull rate and superheat and comprises:
the casting blank drawing speed is less than 0.5m/min, and the first speed is 0;
the casting blank pulling speed is 0.5-1.5m/min, the superheat degree of molten steel is within the range of 10-30 ℃, and the first speed is 5.0-8.0 m/min;
the casting blank pulling speed is 0.5-1.5m/min, the superheat degree of molten steel is within the range of 31-60 ℃, and the first speed is 8.1-12.0 m/min;
the casting blank pulling speed is more than 1.5m/min, the superheat degree of molten steel is within the range of 10-30 ℃, and the first speed is 8.1-12.0 m/min;
the casting blank drawing speed is more than 1.5m/min, the superheat degree of molten steel is within the range of 31-60 ℃, and the first speed is 12.1-15.0 m/min.
9. A method of producing continuous casting billets as claimed in any one of the claims 1 to 8, characterised in that,
the preset model includes HRB400E, HRB500E or HRB 600.
10. A steel bar produced by the method for producing a continuous casting billet according to any one of claims 1 to 9.
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