CN111041384A - Steel plate with excellent core impact toughness of casting blank finished material and production method thereof - Google Patents
Steel plate with excellent core impact toughness of casting blank finished material and production method thereof Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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Abstract
The invention discloses a steel plate with a casting blank material and excellent core impact toughness and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: c: 0.15-0.17%, Si: 0.25 to 0.50%, Mn: 1.35-1.45%, P is less than or equal to 0.012%, S is less than or equal to 0.002%, Ni: 0.20-0.25%, Al: 0.020 to 0.040%, Nb: 0.025-0.030%, Cr: 0.15-0.20%, and the balance of Fe and inevitable impurities; the production method comprises the working procedures of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment. The steel plate obtained by the invention has the characteristics of higher purity, uniform components, compact interior and excellent mechanical property, and is completely suitable for producing the container plate with the required plate thickness of 1/2 parts and low-temperature impact toughness by adopting a continuous casting billet with a low compression ratio.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a steel plate with a casting blank material and excellent core impact toughness and a production method thereof.
Background
For a wide thick plate of a continuous casting billet, the part 1/2 with the plate thickness is often a part with concentrated defects. Common defects in this location are: composition segregation, macro-segregation, inclusions, and the like. These defects often affect the mechanical properties of the steel plate and thus the service life of the container. Meanwhile, as the size of the container equipment is gradually increased, the pressure bearing capacity of the container is required to be improved more than before. At present, the domestic container design unit is required to have excellent low-temperature impact toughness at the steel plate thickness of 1/2.
For a steel plate made of a continuous casting billet, the compression ratio is usually required to be more than 4, and the impact value at 1/2 of the steel plate is ensured to be more than 100J. The thickness of a continuous casting billet in a production plant is usually a fixed value, and the whole process flow is optimized and controlled to ensure that a steel plate with the compression ratio of 2.75-4 has good low-temperature impact toughness at the position of 1/2 parts of the plate thickness. The method has great effects on prolonging the service life of the pressure container and improving the grade.
Disclosure of Invention
The invention aims to solve the technical problem of providing a steel plate with a casting blank material and excellent core impact toughness under the condition that the compression ratio of the blank/plate is lower than 3.33; meanwhile, the invention also provides a production method of the steel plate with the casting blank material and excellent core impact toughness.
In order to solve the technical problems, the invention adopts the technical scheme that: a casting blank finished product has a steel plate with excellent core impact toughness, and the steel plate comprises the following chemical components in percentage by mass: c: 0.15-0.17%, Si: 0.25 to 0.50%, Mn: 1.35-1.45%, P is less than or equal to 0.012%, S is less than or equal to 0.007%, Ni: 0.20-0.25%, Al: 0.020 to 0.040%, Nb: 0.025-0.030%, Cr: 0.10 to 0.20%, and the balance of Fe and inevitable impurities.
The steel plate is produced by adopting a continuous casting billet with a low compression ratio (the ratio of the thickness of the continuous casting billet to the thickness of a finished steel plate is less than or equal to 3.34); the thickness specification of the steel plate is 90-120 mm.
The steel plate has yield strength of 280-400 MPa, tensile strength of 485-620 MPa and elongation A: 20-31%, and the impact energy at the thickness of 1/2 ℃ below zero is more than 100J.
The invention also provides a production method of the steel plate with the casting blank finished product and excellent core impact toughness, which comprises the working procedures of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment; in the smelting process, the tapped molten steel comprises the following chemical components in percentage by mass: c: 0.15-0.17%, Si: 0.25 to 0.50%, Mn: 1.35-1.45%, P is less than or equal to 0.012%, S is less than or equal to 0.007%, Ni: 0.20-0.25%, Al: 0.020 to 0.040%, Nb: 0.025-0.030%, Cr: 0.10 to 0.20%, and the balance of Fe and inevitable impurities.
The smelting process comprises primary smelting, LF furnace refining and VD furnace vacuum treatment:
A. primary smelting: preferentially selecting the preferred material to be smelted in an electric furnace, wherein the steel tapping condition of a primary smelting furnace is as follows: p is less than 0.012%;
B. refining in an LF furnace: the primary molten steel is put into an LF furnace for refining, the chemical composition and mass percentage content range of the steel plate are added with alloy, the element components are adjusted, the total refining time is more than or equal to 60min, the white slag retention time is more than or equal to 30min, and good slagging is ensured;
C. vacuum treatment in a VD furnace: transferring the molten steel refined by the LF furnace into a VD furnace for vacuum degassing treatment, wherein the vacuum degree is less than or equal to 66Pa, the vacuum retention time is more than or equal to 20min, and after breaking the vacuum, carrying out soft blowing for more than or equal to 5min and then hoisting;
according to the continuous casting process, the smelted molten steel is subjected to continuous casting operation to obtain a continuous casting blank, and defects such as cracks, subcutaneous bubbles and the like on the surface of the steel blank are cleaned by utilizing flame cleaning.
The heating process of the invention comprises the steps of heating the continuous heating furnace at a maximum heating temperature of 1280 ℃ and a soaking temperature of 1240-1260 ℃, wherein the total closing of a section of burner is not allowed in the heating process, and the heating coefficient is more than or equal to 14 min/cm.
The rolling procedure adopts a two-stage rolling process of a recrystallization zone and a non-recrystallization zone for rolling; the initial rolling temperature of the first stage is 1050-1080 ℃, the final rolling temperature is 950-1020 ℃, the single-pass reduction of the first stage is 25-50 mm, the accumulated reduction rate is 35-85%, and the steel airing thickness is the rolling thickness plus 50 mm; the initial rolling temperature of the second stage is 860-880 ℃, the final rolling temperature is 820-850 ℃, the accumulated reduction rate is 15-65%, and the single-pass reduction rate is more than or equal to 10% and more than or equal to 3 passes.
In the cooling after rolling process, the steel plate is controlled to be cooled after rolling, the temperature of the red returning is controlled to be 600-700 ℃, and the good shape of the steel plate is ensured; and then, stacking and cooling the steel plates off the line, wherein the surface temperature of the steel plates is more than or equal to 450 ℃, the total stacking time of the steel plates with the thickness of less than 100mm is more than or equal to 24 hours, and the total stacking time of the steel plates with the thickness of more than or equal to 100mm is more than or equal to 48 hours.
The heat treatment process adopts quenching and tempering treatment; during quenching treatment, the quenching temperature is 890-910 ℃, the heat preservation time is 15-30 min, and circulating water at 10-30 ℃ is adopted for water cooling to room temperature; and (3) during tempering treatment, the tempering temperature is 610-620 ℃, the heat preservation time is 2-3.5 min/mm, and the steel plate with the excellent low-temperature impact toughness at the position with the plate thickness of 1/2 can be obtained after air cooling to room temperature.
The invention has the advantages that the steel plate with excellent low-temperature impact toughness at the position of 1/2 plate thickness refers to steel plate for blast furnaces and pressure vessels GB/T713-2014 and carbon steel plate for medium and low-temperature pressure vessels ASME SA516/SA 516M-2017; the product performance detection method is based on the standard reference of metallic material Charpy pendulum impact test method GB/T229 and metallic material tensile test GB/T228 Standard test method and definition of Steel product mechanical Property test ASME SA-370.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. according to the invention, by adjusting components such as C, Mn, Cr and Ni, strictly controlling the content of impurity elements such as P, S and adopting appropriate smelting, heating, rolling, cooling after rolling, heat treatment and other process technologies, a fine and uniform microstructure with the grain size of 8-10 grade and excellent mechanical properties are obtained. 2. The thickness of the steel plate obtained by the method is 90-120 mm, the yield strength is 280-400 MPa, the tensile strength is 485-620 MPa, and the elongation A is as follows: 20-25%, and the impact energy at the thickness of 1/2 and the temperature of minus 20 ℃ is more than 100J; 3. the steel plate obtained by the method has the characteristics of higher purity, uniform components, compact interior and excellent mechanical property, and is completely suitable for manufacturing steel plate products with excellent low-temperature impact toughness at the position of 1/2 plate thickness.
The key working procedures of the invention are the working procedures of stacking, heating and rolling with temperature in the continuous casting working procedure, and through the three key working procedures, the segregation of the core of the steel plate is improved, which is beneficial to improving the impact toughness.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The casting blank finished material of the embodiment has the advantages that the thickness of the steel plate with excellent core impact toughness is 90mm, the casting blank with the thickness of 300mm is adopted, and the compression ratio is as follows: 3.33. the chemical composition and the mass percentage of the steel plate are shown in the table 1.
The production method of the steel plate with the casting blank finished product and the excellent core impact toughness comprises the working procedures of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) the smelting process comprises the following steps: the method comprises the following steps of primary smelting, LF furnace refining and VD furnace vacuum treatment:
A. primary smelting: preferentially selecting the preferred material to be smelted in an electric furnace, wherein the steel tapping condition of a primary smelting furnace is as follows: p: 0.009%;
B. refining in an LF furnace: putting the primary molten steel into an LF furnace for refining, adjusting the components of each element, and ensuring good slagging, wherein the total refining time is 63min, and the white slag retention time is 32 min;
C. vacuum treatment in a VD furnace: transferring the molten steel refined in the LF furnace into a VD furnace for vacuum degassing treatment, wherein the vacuum degree is 66Pa, the vacuum retention time is 21min, and after the vacuum is broken, carrying out soft blowing for 6min and then hoisting; the chemical components and the mass percentage of the tapping molten steel are shown in the table 1;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank with the thickness of 300mm, and carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; after cutting the continuous casting blank, stacking and slowly cooling the continuous casting blank, wherein the stacking starting temperature is 550 ℃, and the stacking and slowly cooling time is 24 hours; after stacking and slow cooling, cleaning cracks and subcutaneous bubble defects existing on the surface of the steel blank by using flame;
(3) a heating procedure: the maximum heating temperature of the continuous heating furnace is 1280 ℃, the soaking temperature is 1240 ℃, the complete closing of a certain section of burner is not allowed in the heating process, and the heating coefficient is 14 min/cm;
(4) a rolling procedure: rolling by adopting a two-stage rolling process of a recrystallization zone and a non-recrystallization zone; the initial rolling temperature of the first stage is 1080 ℃, the final rolling temperature is 1020 ℃, the single-pass reduction is 30mm, the cumulative reduction rate is 46.7%, and the steel airing thickness is 140 mm; the initial rolling temperature of the second stage is 880 ℃, the final rolling temperature is 850 ℃, the cumulative reduction rate is 43.3 percent, and the single-pass reduction rate is 12 percent and is 4 passes;
(5) and (3) cooling after rolling: the temperature of the red returning is 700 ℃ after the rolling, so that the good shape of the steel plate is ensured; then, the steel plate is placed off line, stacked and cooled, the surface temperature of the steel plate is 456 ℃, and the total stacking time is 24 hours;
(6) a heat treatment process: quenching and tempering treatment are adopted; during quenching treatment, the quenching temperature is 890 ℃, the heat preservation time is 15min, and circulating water at 10-30 ℃ is cooled to room temperature; and (3) during tempering treatment, the tempering temperature is 620 ℃, the heat preservation time is 2min/mm, and the steel plate with excellent low-temperature toughness for the explosive cladding device can be obtained after air cooling to room temperature.
The performance indexes of the steel plate with excellent core impact toughness of the casting blank finished material of the embodiment are shown in Table 2.
Example 2
The casting blank finished material of the embodiment has the advantages that the thickness of the steel plate with excellent core impact toughness is 100mm, the casting blank with the thickness of 300mm is adopted, and the compression ratio is as follows: 3.34. the chemical composition and the mass percentage of the steel plate are shown in the table 1.
The production method of the steel plate with the casting blank finished product and the excellent core impact toughness comprises the working procedures of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) the smelting process comprises the following steps: the method comprises the following steps of primary smelting, LF furnace refining and VD furnace vacuum treatment:
A. primary smelting: preferentially selecting the preferred material to be smelted in an electric furnace, wherein the steel tapping condition of a primary smelting furnace is as follows: p: 0.010%;
B. refining in an LF furnace: putting the primary molten steel into an LF furnace for refining, adjusting the components of each element, and ensuring good slagging, wherein the total refining time is 65min, and the white slag retention time is 30 min;
C. vacuum treatment in a VD furnace: transferring the molten steel refined in the LF furnace into a VD furnace for vacuum degassing treatment, wherein the vacuum degree is 66Pa, the vacuum retention time is 23min, and after the vacuum is broken, carrying out soft blowing for 6min and then hoisting; the chemical components and the mass percentage of the tapping molten steel are shown in the table 1;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank with the thickness of 300mm, and carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; after the continuous casting billet is cut, stacking and slow cooling are carried out, wherein the stacking starting temperature is 560 ℃, and the stacking and slow cooling time is 28 hours; after stacking and slow cooling, cleaning cracks and subcutaneous bubble defects existing on the surface of the steel blank by using flame;
(3) a heating procedure: the maximum heating temperature of the continuous heating furnace is 1280 ℃, the soaking temperature is 1258 ℃, the complete closing of a certain section of burner is not allowed in the heating process, and the heating coefficient is 15 min/cm;
(4) a rolling procedure: rolling by adopting a two-stage rolling process of a recrystallization zone and a non-recrystallization zone; the initial rolling temperature of the first stage is 1060 ℃, the final rolling temperature is 980 ℃, the single-pass reduction is 25mm, the cumulative reduction rate is 50%, and the steel airing thickness is 150 mm; the second stage has the rolling temperature of 860 ℃, the finishing temperature of 820 ℃, the cumulative reduction rate of 50 percent and the single-pass reduction rate of 12 percent of 4 passes;
(5) and (3) cooling after rolling: the temperature of the red returning is 600 ℃ after the rolling, and the good shape of the steel plate is ensured; then, the steel plate is placed off line, stacked and cooled, the surface temperature of the steel plate is 460 ℃, and the total stacking time is 48 hours;
(6) a heat treatment process: quenching and tempering treatment are adopted; during quenching treatment, the quenching temperature is 910 ℃, the heat preservation time is 20min, and circulating water at 10-30 ℃ is cooled to room temperature; and (3) during tempering treatment, the tempering temperature is 610 ℃, the heat preservation time is 2.5min/mm, and the steel plate with excellent low-temperature toughness for the explosive cladding device can be obtained after air cooling to the room temperature.
The performance indexes of the steel plate with excellent core impact toughness of the casting blank finished material of the embodiment are shown in Table 2.
Example 3
The casting blank finished material of the embodiment has the advantages that the thickness of the steel plate with excellent core impact toughness is 106mm, a casting blank with the thickness of 330mm is adopted, and the compression ratio is as follows: 3.11. the chemical composition and the mass percentage of the steel plate are shown in the table 1.
The production method of the steel plate with the casting blank finished product and the excellent core impact toughness comprises the working procedures of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) the smelting process comprises the following steps: the method comprises the following steps of primary smelting, LF furnace refining and VD furnace vacuum treatment:
A. primary smelting: preferentially selecting the preferred material to be smelted in an electric furnace, wherein the steel tapping condition of a primary smelting furnace is as follows: p: 0.010%;
B. refining in an LF furnace: putting the primary molten steel into an LF furnace for refining, adjusting the components of each element, and ensuring good slagging, wherein the total refining time is 65min, and the white slag retention time is 30 min;
C. vacuum treatment in a VD furnace: transferring the molten steel refined in the LF furnace into a VD furnace for vacuum degassing treatment, wherein the vacuum degree is 66Pa, the vacuum retention time is 23min, and after the vacuum is broken, carrying out soft blowing for 6min and then hoisting; the chemical components and the mass percentage of the tapping molten steel are shown in the table 1;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank with the thickness of 330mm, and carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; after the continuous casting billet is cut, stacking and slow cooling are carried out, wherein the stacking starting temperature is 570 ℃, and the stacking and slow cooling time is 26 hours; after stacking and slow cooling, cleaning cracks and subcutaneous bubble defects existing on the surface of the steel blank by using flame;
(3) a heating procedure: the maximum heating temperature of the continuous heating furnace is 1280 ℃, the soaking temperature is 1260 ℃, the complete closing of a certain section of burner is not allowed in the heating process, and the heating coefficient is 14 min/cm;
(4) a rolling procedure: rolling by adopting a two-stage rolling process of a recrystallization zone and a non-recrystallization zone; the initial rolling temperature of the first stage is 1080 ℃, the final rolling temperature is 960 ℃, the single-pass reduction is 30mm, the cumulative reduction rate is 47.3%, and the steel airing thickness is 156 mm; the initial rolling temperature of the second stage is 880 ℃, the final rolling temperature is 820 ℃, the cumulative reduction rate is 52.7 percent, and the single-pass reduction rate is 12 percent and 4 passes;
(5) and (3) cooling after rolling: the temperature of the red returning is 600 ℃ after the rolling, and the good shape of the steel plate is ensured; then, the steel plate is placed off line, stacked and cooled, the surface temperature of the steel plate is 460 ℃, and the total stacking time is 48 hours;
(6) a heat treatment process: quenching and tempering treatment are adopted; during quenching treatment, the quenching temperature is 910 ℃, the heat preservation time is 20min, and circulating water at 10-30 ℃ is cooled to room temperature; and (3) during tempering treatment, the tempering temperature is 620 ℃, the heat preservation time is 3min/mm, and the steel plate with excellent low-temperature toughness for the explosive cladding device can be obtained after air cooling to room temperature.
The performance indexes of the steel plate with excellent core impact toughness of the casting blank finished material of the embodiment are shown in Table 2.
Example 4
The casting blank finished material of the embodiment has the advantages that the thickness of the steel plate with excellent core impact toughness is 120mm, a casting blank with the thickness of 330mm is adopted, and the compression ratio is as follows: 2.75. the chemical composition and the mass percentage of the steel plate are shown in the table 1.
The production method of the steel plate with the casting blank finished product and the excellent core impact toughness comprises the working procedures of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) the smelting process comprises the following steps: the method comprises the following steps of primary smelting, LF furnace refining and VD furnace vacuum treatment:
A. primary smelting: preferentially selecting the preferred material to be smelted in an electric furnace, wherein the steel tapping condition of a primary smelting furnace is as follows: p: 0.010%;
B. refining in an LF furnace: putting the primary molten steel into an LF furnace for refining, adjusting the components of each element, and ensuring good slagging, wherein the total refining time is 65min, and the white slag retention time is 30 min;
C. vacuum treatment in a VD furnace: transferring the molten steel refined in the LF furnace into a VD furnace for vacuum degassing treatment, wherein the vacuum degree is 66Pa, the vacuum retention time is 23min, and after the vacuum is broken, carrying out soft blowing for 6min and then hoisting; the chemical components and the mass percentage of the tapping molten steel are shown in the table 1;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank with the thickness of 330mm, and carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; after the continuous casting billet is cut, stacking and slow cooling are carried out, wherein the stacking starting temperature is 570 ℃, and the stacking and slow cooling time is 27 hours; after stacking and slow cooling, cleaning cracks and subcutaneous bubble defects existing on the surface of the steel blank by using flame;
(3) a heating procedure: the maximum heating temperature of the continuous heating furnace is 1280 ℃, the soaking temperature is 1250 ℃, the nozzles of a certain section are not allowed to be completely closed in the heating process, and the heating coefficient is 14.5 min/cm;
(4) a rolling procedure: rolling by adopting a two-stage rolling process of a recrystallization zone and a non-recrystallization zone; the initial rolling temperature of the first stage is 1080 ℃, the final rolling temperature is 960 ℃, the single-pass reduction is 30mm, the cumulative reduction rate is 51.52%, and the steel airing thickness is 150 mm; the initial rolling temperature of the second stage is 880 ℃, the final rolling temperature is 845 ℃, the cumulative reduction rate is 48.48%, and the single-pass reduction rate is 12% of 4 passes;
(5) and (3) cooling after rolling: the temperature of the red returning is 600 ℃ after the rolling, and the good shape of the steel plate is ensured; then, the steel plate is placed off line, stacked and cooled, the surface temperature of the steel plate is 460 ℃, and the total stacking time is 48 hours;
(6) a heat treatment process: quenching and tempering treatment are adopted; during quenching treatment, the quenching temperature is 910 ℃, the heat preservation time is 30min, and circulating water at 10-30 ℃ is cooled to room temperature; go back to
And during fire treatment, tempering at 600 ℃ for 3.5min/mm, and air-cooling to room temperature to obtain the steel plate with excellent low-temperature toughness for the explosive cladding device.
The performance indexes of the steel plate with excellent core impact toughness of the casting blank finished material of the embodiment are shown in Table 2.
Example 5
The casting blank finished material of the embodiment has a steel plate with excellent core impact toughness and a thickness of 95mm, and adopts a casting blank with a compression ratio of 300mm, wherein the compression ratio is as follows: 3.16. the chemical composition and the mass percentage of the steel plate are shown in the table 1.
The production method of the steel plate with the casting blank finished product and the excellent core impact toughness comprises the working procedures of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) the smelting process comprises the following steps: the method comprises the following steps of primary smelting, LF furnace refining and VD furnace vacuum treatment:
A. primary smelting: preferentially selecting the preferred material to be smelted in an electric furnace, wherein the steel tapping condition of a primary smelting furnace is as follows: p: 0.011 percent;
B. refining in an LF furnace: putting the primary molten steel into an LF furnace for refining, adjusting the components of each element, and ensuring good slagging, wherein the total refining time is 60min, and the white slag retention time is 32 min;
C. vacuum treatment in a VD furnace: transferring the molten steel refined by the LF furnace into a VD furnace for vacuum degassing treatment, wherein the vacuum degree is 65Pa, the vacuum retention time is 20min, and after breaking the vacuum, carrying out soft blowing for 5min and then hoisting; the chemical components and the mass percentage of the tapping molten steel are shown in the table 1;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank with the thickness of 300mm, and carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; after cutting the continuous casting blank, stacking and slowly cooling the continuous casting blank, wherein the stacking starting temperature is 550 ℃, and the stacking and slowly cooling time is 24 hours; after stacking and slow cooling, cleaning cracks and subcutaneous bubble defects existing on the surface of the steel blank by using flame;
(3) a heating procedure: the maximum heating temperature of the continuous heating furnace is 1280 ℃, the soaking temperature is 1240 ℃, the complete closing of a certain section of burner is not allowed in the heating process, and the heating coefficient is 14 min/cm;
(4) a rolling procedure: rolling by adopting a two-stage rolling process of a recrystallization zone and a non-recrystallization zone; the first stage rolling temperature is 1050 ℃, the final rolling temperature is 950 ℃, the single-pass reduction is 50mm, the accumulated reduction rate is 35%, and the steel airing thickness is 140 mm; the second stage is at the start rolling temperature of 870 ℃ and the finish rolling temperature of 820 ℃, the accumulated reduction rate is 15 percent, and the single-pass reduction rate is 10 percent and is 3 passes;
(5) and (3) cooling after rolling: the temperature of the red returning is 600 ℃ after the rolling, and the good shape of the steel plate is ensured; then, the steel plate is placed off line, stacked and cooled, the surface temperature of the steel plate is 450 ℃, and the total stacking time is 24 hours;
(6) a heat treatment process: quenching and tempering treatment are adopted; during quenching treatment, the quenching temperature is 890 ℃, the heat preservation time is 15min, and circulating water at 10-30 ℃ is cooled to room temperature; and (3) during tempering treatment, the tempering temperature is 620 ℃, the heat preservation time is 3min/mm, and the steel plate with excellent low-temperature toughness for the explosive cladding device can be obtained after air cooling to room temperature.
The performance indexes of the steel plate with excellent core impact toughness of the casting blank finished material of the embodiment are shown in Table 2.
Example 6
The casting blank finished material of the embodiment has the steel plate with the excellent core impact toughness, the thickness of the steel plate is 115mm, a casting blank with the thickness of 330mm and the compression ratio is as follows: 2.87. the chemical composition and the mass percentage of the steel plate are shown in the table 1.
The production method of the steel plate with the casting blank finished product and the excellent core impact toughness comprises the working procedures of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) the smelting process comprises the following steps: the method comprises the following steps of primary smelting, LF furnace refining and VD furnace vacuum treatment:
A. primary smelting: preferentially selecting the preferred material to be smelted in an electric furnace, wherein the steel tapping condition of a primary smelting furnace is as follows: p: 0.009%;
B. refining in an LF furnace: putting the primary molten steel into an LF furnace for refining, adjusting the components of each element, and ensuring good slagging, wherein the total refining time is 63min, and the white slag retention time is 32 min;
C. vacuum treatment in a VD furnace: transferring the molten steel refined in the LF furnace into a VD furnace for vacuum degassing treatment, wherein the vacuum degree is 66Pa, the vacuum retention time is 21min, and after the vacuum is broken, carrying out soft blowing for 6min and then hoisting; the chemical components and the mass percentage of the tapping molten steel are shown in the table 1;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank with the thickness of 330mm, and carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; after cutting the continuous casting blank, stacking and slowly cooling the continuous casting blank, wherein the stacking starting temperature is 550 ℃, and the stacking and slowly cooling time is 24 hours; after stacking and slow cooling, cleaning cracks and subcutaneous bubble defects existing on the surface of the steel blank by using flame;
(3) a heating procedure: the maximum heating temperature of the continuous heating furnace is 1280 ℃, the soaking temperature is 1240 ℃, the complete closing of a certain section of burner is not allowed in the heating process, and the heating coefficient is 14 min/cm;
(4) a rolling procedure: rolling by adopting a two-stage rolling process of a recrystallization zone and a non-recrystallization zone; in the first stage, the initial rolling temperature is 1100 ℃, the final rolling temperature is 1050 ℃, the single-pass reduction is 37mm, the cumulative reduction rate is 85%, and the steel airing thickness is 140 mm; the second stage is at the start rolling temperature of 870 ℃ and the finish rolling temperature of 840 ℃, the accumulated reduction rate is 65 percent, and the single-pass reduction rate of 10 percent is 4 passes;
(5) and (3) cooling after rolling: the temperature of the red returning is 700 ℃ after the rolling, so that the good shape of the steel plate is ensured; then, the steel plate is placed off line, stacked and cooled, the surface temperature of the steel plate is 456 ℃, and the total stacking time is 24 hours;
(6) a heat treatment process: quenching and tempering treatment are adopted; during quenching treatment, the quenching temperature is 890 ℃, the heat preservation time is 30min, and circulating water at 10-30 ℃ is cooled to room temperature; and (3) during tempering treatment, the tempering temperature is 620 ℃, the heat preservation time is 3.5min/mm, and the steel plate with excellent low-temperature toughness for the explosive cladding device can be obtained after air cooling to the room temperature.
The performance indexes of the steel plate with excellent core impact toughness of the casting blank finished material of the embodiment are shown in Table 2.
TABLE 1 EXAMPLES 1-6 casting blank compositions having chemical compositions of steel plates excellent in core impact toughness and mass% thereof
The balance of the ingredients in table 1 is Fe and unavoidable impurities.
TABLE 2 EXAMPLES 1-6 casting blank products having performance indexes of steel plate with excellent core impact toughness
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (10)
1. The steel plate with the casting blank material and the excellent core impact toughness is characterized by comprising the following chemical components in percentage by mass: c: 0.15-0.17%, Si: 0.25 to 0.50%, Mn: 1.35-1.45%, P is less than or equal to 0.012%, S is less than or equal to 0.007%, Ni: 0.20-0.25%, Al: 0.020 to 0.040%, Nb: 0.025-0.030%, Cr: 0.10 to 0.20%, and the balance of Fe and inevitable impurities.
2. The steel plate with excellent core impact toughness as claimed in claim 1, wherein said steel plate is produced by using a low compression ratio continuous casting slab, said low compression ratio is that the ratio of the thickness of the continuous casting slab to the thickness of the finished steel plate is 2.75-3.34, and the thickness of the steel plate is 90-120 mm.
3. The steel plate as claimed in claim 1, wherein the steel plate has a yield strength of 280-400 MPa, a tensile strength of 485-620 MPa, and an elongation A: 20-31%, and the impact energy at the thickness of 1/2 ℃ below zero is more than 100J.
4. A method for producing a steel plate having excellent core impact toughness based on the billet material as set forth in any one of claims 1 to 3, characterized in that the method comprises the steps of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment; and (3) a cooling process after rolling, wherein the temperature of red returning is controlled to be 600-700 ℃, then the steel plate is stacked and cooled off line, the surface temperature of the steel plate is more than or equal to 450 ℃, the total stacking time of the steel plate with the thickness of less than 100mm is more than or equal to 24 hours, and the total stacking time of the steel plate with the thickness of more than or equal to 100mm is more than or equal to 48.
5. The method for producing a steel plate with a billet material having excellent core impact toughness as claimed in claim 4, wherein the smelting process comprises primary smelting, LF furnace refining, VD furnace vacuum treatment:
A. primary smelting: tapping conditions of the primary smelting furnace are as follows: p is less than 0.012%;
B. refining in an LF furnace: putting the primary molten steel into an LF furnace for refining, wherein the total refining time is more than or equal to 60min, and the white slag retention time is more than or equal to 30 min;
C. vacuum treatment in a VD furnace: transferring the molten steel refined by the LF furnace into a VD furnace for vacuum degassing treatment, wherein the vacuum degree is less than or equal to 66Pa, the vacuum retention time is more than or equal to 20min, and after breaking the vacuum, carrying out soft blowing for more than or equal to 5min, and then hoisting.
6. The method for producing a steel sheet having a good core impact toughness as claimed in claim 4, wherein said continuous casting step comprises continuously casting the molten steel after melting to obtain a continuous cast slab; after cutting the continuous casting blank, stacking and slowly cooling, wherein the stacking starting temperature is more than or equal to 550 ℃, and the stacking and slowly cooling time is more than or equal to 24 hours; after the stacking is slowly cooled, the defects of cracks and bubbles under the skin on the surface of the steel blank are cleaned by using flame cleaning.
7. The method for producing a steel plate with excellent core impact toughness as claimed in any one of claims 4 to 6, wherein said heating step is carried out in a continuous furnace at a maximum heating temperature of 1280 ℃ and a soaking temperature of 1240 to 1260 ℃, and the nozzles of a certain section are not allowed to be completely closed during heating, and the heating coefficient is not less than 14 min/cm.
8. The method for producing a steel plate having excellent core impact toughness as claimed in any one of claims 4 to 6, wherein said rolling step is carried out by a two-stage rolling process of a recrystallization zone and a non-recrystallization zone; the initial rolling temperature of the first stage is 1050-1100 ℃, the final rolling temperature is 950-1050 ℃, the single-pass reduction of the first stage is 25-50 mm, the accumulated reduction rate is 35-85%, and the steel airing thickness is the rolling thickness plus 50 mm; the initial rolling temperature of the second stage is 860-880 ℃, the final rolling temperature is 820-850 ℃, the accumulated reduction rate is 15-65%, and the single-pass reduction rate is not less than 10% and is not less than 3 passes.
9. The method for producing the steel plate with excellent core impact toughness as claimed in any one of claims 4 to 6, wherein the step of cooling after rolling comprises controlling the cooling after rolling of the steel plate, wherein the temperature of the red returning is controlled to be 600-700 ℃ to ensure good plate shape of the steel plate; and then, stacking and cooling the steel plates off the line, wherein the surface temperature of the steel plates is more than or equal to 450 ℃, the total stacking time of the steel plates with the thickness of less than 100mm is more than or equal to 24 hours, and the total stacking time of the steel plates with the thickness of more than or equal to 100mm is more than or equal to 48 hours.
10. The method for producing a steel sheet having excellent core impact toughness as claimed in any one of claims 4 to 6, wherein said heat treatment step comprises quenching and tempering; during quenching treatment, the quenching temperature is 890-910 ℃, the heat preservation time is 15-30 min, and circulating water at 10-30 ℃ is adopted for water cooling to room temperature; and (3) during tempering treatment, the tempering temperature is 600-620 ℃, the heat preservation time is 2-3.5 min/mm, and the steel plate with excellent core impact toughness can be obtained by air cooling to room temperature.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114393194A (en) * | 2021-12-31 | 2022-04-26 | 舞阳钢铁有限责任公司 | Production method of stainless steel composite plate steel plate |
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