CN112342350B - Production method of high-strength and high-toughness thick steel plate - Google Patents
Production method of high-strength and high-toughness thick steel plate Download PDFInfo
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
A production method of a high-strength and high-toughness thick steel plate belongs to the technical field of steel plate rolling and comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment. A finish rolling process, wherein the initial rolling temperature is less than or equal to 850 ℃, and the final rolling temperature is 800-820 ℃; a cooling procedure, wherein an ultra-fast cooling mode is adopted, so that the steel plate is directly quenched on line, and the final cooling temperature is less than or equal to 200 ℃; the steel plate product obtained by the invention has high strength and high toughness, the tensile strength is more than or equal to 570MPa, the yield strength is more than or equal to 460MPa, and the AKV at minus 40 ℃ is more than or equal to 200J; the production method is simple, does not need quenching and tempering (quenching and high-temperature tempering), and has lower production cost.
Description
Technical Field
The invention belongs to the technical field of steel plate rolling, and particularly relates to a production method of a high-strength and high-toughness thick steel plate.
Background
As is well known, the strength grade of a thick steel plate produced by a continuous casting slab on a 3500mm rolling mill is generally low due to a small compression ratio, and is mainly below the 390 MPa-grade yield strength (510 MPa tensile strength). Some enterprises even adopt a steel ingot rolling method for production, and a Chinese patent 'recent production method of a structural steel plate Q345qDZ35 steel for an extra-thick bridge', with the application number of 201110198922, introduces a production method for rolling bridge steel with the yield strength of Q345MPa (tensile strength of 490 MPa) grade by adopting water-cooling mold ingot casting.
Disclosure of Invention
The invention aims to solve the technical problem that a high-strength high-toughness thick-specification steel plate with the yield strength of more than or equal to 460MPa (the tensile strength of more than or equal to 570 MPa) cannot be obtained by casting blank rolling at present.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the production method of the high-strength and high-toughness thick steel plate comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment, and is characterized in that the finish rolling working procedure has the initial rolling temperature of less than or equal to 850 ℃ and the final rolling temperature of 800-820 ℃; the cooling procedure adopts an ultra-fast cooling mode to directly quench the steel plate on line, and the final cooling temperature is less than or equal to 200 ℃.
The cooling procedure adopts an ultra-fast cooling mode, so that the steel plate is directly quenched on line, the final cooling temperature is less than or equal to 200 ℃, and the quenching and tempering heat treatment after the steel plate is rolled is avoided, so that the heat treatment cost is reduced.
Preferably, in the tempering heat treatment process, the tempering temperature is 590-610 ℃, and the tempering time is 110-130min.
And after the steel plate is rolled, offline tempering. In the tempering process, a radiant tube type high-temperature tempering furnace can be adopted for tempering, the tempering time is counted when the tail of the steel plate enters the heating furnace, and the timing when the tail of the steel plate exits the heating furnace is ended.
Preferably, the heating process adopts a stepping heating furnace for heating, the temperature of a heating section is 1250-1280 ℃, the temperature of a soaking section is 1240-1260 ℃, and the total heating time is 5-6h.
The total heating time is 5-6h, so that the temperature of the casting blank is fully uniform.
Preferably, in the rough rolling procedure, the initial rolling temperature is 1100-1150 ℃, and the final rolling temperature is more than or equal to 980 ℃.
Preferably, in the rough rolling step, a high-temperature high-pressure reduction process is adopted in the rough rolling stage, reduction passes are reduced as much as possible, and the single-pass reduction rate is distributed in a mode of increasing passes.
Preferably, the finish rolling process is completed by 4-pass rolling by adopting a high reduction system.
Preferably, the steel plate is obtained by rolling a plate blank, the production of the plate blank comprises the working procedures of converter smelting, LF refining, RH refining and continuous casting, and the RH refining enables molten steel to be fully dehydrogenated so that the content of H in the steel is less than or equal to 2ppm.
Preferably, in the continuous casting process, the casting blank is slowly cooled after being off the line, and the slow cooling time is more than or equal to 48 hours.
Preferably, the plate blank specification is 280mm in thickness, the intermediate blank specification is 140mm in thickness after the rough rolling process is finished, and the steel plate finished product specification is 90mm in thickness after the rolling process is finished.
Preferably, the steel plate comprises the following chemical components in percentage by mass: 0.03 to 0.05 percent of C, 1.50 to 1.70 percent of Mn, less than or equal to 0.003 percent of S, less than or equal to 0.012 percent of P, 0.25 to 0.35 percent of Si, 0.020 to 0.050 percent of Als, 0.025 to 0.050 percent of Nb, 0.05 to 0.07 percent of V, and the balance of Fe and inevitable impurities.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: according to the production method of the high-strength and high-toughness thick steel plate, the obtained steel plate product has high strength and high toughness, the tensile strength is more than or equal to 570MPa, the yield strength is more than or equal to 460MPa, and the AKV at-40 ℃ is more than or equal to 200J; the production method is simple, does not need quenching and tempering (quenching and high-temperature tempering), and has lower production cost.
Drawings
FIG. 1 shows the metallographic structure of a steel plate directly quenched by an ultrafast cooling process in example 3.
FIG. 2 shows the metallographic structure of the tempered steel sheet in example 3.
FIG. 3 shows the metallographic structure of the tempered steel sheet in example 5.
Detailed Description
The invention relates to a production method of a high-strength and high-toughness thick steel plate, which comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment, wherein the steel plate is obtained by rolling a plate blank, the plate blank production comprises the working procedures of converter smelting, LF refining, RH refining and continuous casting, and the steel plate comprises the following chemical components in percentage by mass: 0.03 to 0.05 percent of C, 1.50 to 1.70 percent of Mn, less than or equal to 0.003 percent of S, less than or equal to 0.012 percent of P, 0.25 to 0.35 percent of Si, 0.020 to 0.050 percent of Als, 0.025 to 0.050 percent of Nb, 0.05 to 0.07 percent of V, and the balance of Fe and inevitable impurities, and an RH refining process, so that molten steel is fully dehydrogenated, and the content of H in the steel is less than or equal to 2ppm. And in the continuous casting process, slowly cooling the casting blank after the casting blank is off line, wherein the slow cooling time is more than or equal to 48 hours. And in the heating process, a stepping heating furnace is adopted for heating, the temperature of a heating section is 1250-1280 ℃, the temperature of a soaking section is 1240-1260 ℃, and the total heating time is 5-6h. The rough rolling procedure has the initial rolling temperature of 1100-1150 ℃, the final rolling temperature of more than or equal to 980 ℃, the rough rolling stage adopts a high-temperature large-reduction process, reduction passes are reduced as much as possible, and the single-pass reduction rate adopts mode distribution of increasing passes. And (3) a finish rolling process, wherein the initial rolling temperature is less than or equal to 850 ℃, the finish rolling temperature is 800-820 ℃, the finish rolling process adopts a high reduction system, and 4-pass rolling is completed. And a cooling procedure, namely adopting an ultra-fast cooling mode to directly quench the steel plate on line, wherein the final cooling temperature is less than or equal to 200 ℃. And (3) tempering heat treatment, wherein the tempering temperature is 590-610 ℃, and the tempering time is 110-130min. The plate blank specification is 280mm in thickness, the intermediate blank specification is 140mm in thickness after the rough rolling process is finished, and the finished steel plate specification is 90mm in thickness after the rolling process is finished.
The present invention will be described in further detail with reference to specific examples.
Example 1
The chemical components and the mass percentage content of the steel plate are shown in table 1, the steel plate production process comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment, the steel plate is obtained by rolling a plate blank, the plate blank production comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting and RH refining, and the molten steel is fully dehydrogenated to obtain the H content of 2ppm in the steel. And in the continuous casting process, slowly cooling the casting blank after the casting blank is off line, wherein the slowly cooling time is 48 hours. And in the heating process, a stepping heating furnace is adopted for heating, the temperature of a heating section is 1250 ℃, the temperature of a soaking section is 1240 ℃, and the total heating time is 6h. The rough rolling procedure adopts a high-temperature large-reduction process, reduction passes are reduced as much as possible, and the single-pass reduction rate is distributed in a mode of increasing passes. And the finish rolling procedure adopts a high reduction system, and 4-pass rolling is completed. And a cooling procedure, wherein an ultra-fast cooling mode is adopted, so that the steel plate is directly quenched on line. The initial rolling temperature of the rough rolling procedure, the final rolling temperature of the rough rolling procedure, the initial rolling temperature of the finish rolling procedure, the final rolling temperature of the finish rolling procedure and the final cooling temperature of the cooling procedure are shown in a table 2, the tempering heat treatment procedure is carried out, the tempering temperature is 590 ℃, and the tempering time is 130min. The specification of the plate blank is 280mm, the specification of the intermediate blank is 140mm after the rough rolling process is finished, and the specification of the finished steel plate product is 90mm after the rolling process is finished.
Example 2
The chemical components and the mass percentage content of the steel plate are shown in table 1, the steel plate production process comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment, the steel plate is obtained by rolling a plate blank, the plate blank production comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting and RH refining, and the molten steel is fully dehydrogenated to obtain the H content of 1ppm in the steel. And in the continuous casting process, the casting blank is slowly cooled after being off the line, and the slow cooling time is 49 hours. And in the heating process, a stepping heating furnace is adopted for heating, the temperature of a heating section is 1254 ℃, the temperature of a soaking section is 1244 ℃, and the total heating time is 5.8 hours. The rough rolling procedure adopts a high-temperature large-reduction process, reduction passes are reduced as much as possible, and the single-pass reduction rate is distributed in a mode of increasing passes. And the finish rolling procedure adopts a high reduction system, and 4-pass rolling is completed. And a cooling procedure, wherein an ultra-fast cooling mode is adopted, so that the steel plate is directly quenched on line. The initial rolling temperature of the rough rolling procedure, the final rolling temperature of the rough rolling procedure, the initial rolling temperature of the finish rolling procedure, the final rolling temperature of the finish rolling procedure and the final cooling temperature of the cooling procedure are shown in a table 2, the tempering heat treatment procedure is carried out at the tempering temperature of 594 ℃ and the tempering time of 124min. The specification of the plate blank is 280mm, the specification of the intermediate blank is 140mm after the rough rolling process is finished, and the specification of the finished steel plate product is 90mm after the rolling process is finished.
Example 3
The chemical components and the mass percentage content of the steel plate are shown in table 1, the steel plate production process comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment, the steel plate is obtained by rolling a plate blank, the plate blank production comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting and RH refining, and the molten steel is fully dehydrogenated to obtain the H content of 1ppm in the steel. And in the continuous casting process, slowly cooling the casting blank after the casting blank is off-line, wherein the slowly cooling time is 50 hours. And in the heating process, a stepping heating furnace is adopted for heating, the temperature of a heating section is 1259 ℃, the temperature of a soaking section is 1249 ℃, and the total heating time is 5.7 hours. The rough rolling procedure adopts a high-temperature large-reduction process, reduction passes are reduced as much as possible, and the single-pass reduction rate is distributed in a mode of increasing passes. And the finish rolling procedure adopts a high reduction system, and 4-pass rolling is completed. And a cooling procedure, wherein an ultra-fast cooling mode is adopted, so that the steel plate is directly quenched on line. The initial rolling temperature of the rough rolling procedure, the final rolling temperature of the rough rolling procedure, the initial rolling temperature of the finish rolling procedure, the final rolling temperature of the finish rolling procedure and the final cooling temperature of the cooling procedure are shown in the table 2, the tempering heat treatment procedure is carried out, the tempering temperature is 597 ℃, and the tempering time is 122min. The specification of the plate blank is 280mm, the specification of the intermediate blank is 140mm after the rough rolling process is finished, and the specification of the finished steel plate product is 90mm after the rolling process is finished.
Example 4
The chemical components and the mass percentage content of the steel plate are shown in table 1, the steel plate production process comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment, the steel plate is obtained by rolling a plate blank, the plate blank production comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting and RH refining, and the molten steel is fully dehydrogenated to obtain the H content of 0ppm (not detected by detection equipment) in the steel. And in the continuous casting process, the casting blank is subjected to slow cooling after being discharged, and the slow cooling time is 51 hours. And in the heating process, a stepping heating furnace is adopted for heating, the temperature of a heating section is 1268 ℃, the temperature of a soaking section is 1253 ℃, and the total heating time is 5.5h. The rough rolling procedure adopts a high-temperature large-reduction process, reduction passes are reduced as much as possible, and the single-pass reduction rate is distributed in a mode of increasing passes. And the finish rolling procedure adopts a high reduction system, and 4-pass rolling is completed. And a cooling procedure, wherein an ultra-fast cooling mode is adopted, so that the steel plate is directly quenched on line. The initial rolling temperature of the rough rolling procedure, the final rolling temperature of the rough rolling procedure, the initial rolling temperature of the finish rolling procedure, the final rolling temperature of the finish rolling procedure and the final cooling temperature of the cooling procedure are shown in a table 2, the tempering heat treatment procedure is carried out at the tempering temperature of 599 ℃, and the tempering time is 119min. The specification of the plate blank is 280mm, the specification of the intermediate blank is 140mm after the rough rolling process is finished, and the specification of the finished steel plate product is 90mm after the rolling process is finished.
Example 5
The chemical components and the mass percentage content of the steel plate are shown in table 1, the steel plate production process comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment, the steel plate is obtained by rolling a plate blank, the plate blank production comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting and RH refining, and the molten steel is fully dehydrogenated to obtain the H content of 0ppm (not detected by detection equipment) in the steel. And in the continuous casting process, the casting blank is slowly cooled after being off the line, and the slow cooling time is 56 hours. The heating process adopts a stepping heating furnace for heating, the temperature of a heating section is 1271 ℃, the temperature of a soaking section is 1256 ℃, and the total heating time is 5.3h. The rough rolling procedure adopts a high-temperature large-reduction process, reduction passes are reduced as much as possible, and the single-pass reduction rate is distributed in a mode of increasing passes. And the finish rolling procedure adopts a high reduction system, and 4-pass rolling is completed. And a cooling procedure, wherein an ultra-fast cooling mode is adopted, so that the steel plate is directly quenched on line. The initial rolling temperature of the rough rolling procedure, the final rolling temperature of the rough rolling procedure, the initial rolling temperature of the finish rolling procedure, the final rolling temperature of the finish rolling procedure and the final cooling temperature of the cooling procedure are shown in a table 2, the tempering heat treatment procedure is carried out, the tempering temperature is 601 ℃, and the tempering time is 118min. The specification of the plate blank is 280mm, the specification of the intermediate blank is 140mm after the rough rolling process is finished, and the specification of the finished steel plate product is 90mm after the rolling process is finished.
Example 6
The chemical components and the mass percentage content of the steel plate are shown in table 1, the steel plate production process comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment, the steel plate is obtained by rolling a plate blank, the plate blank production comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting and RH refining, and the molten steel is fully dehydrogenated to obtain the H content of 1ppm in the steel. And in the continuous casting process, slowly cooling the casting blank after the casting blank is discharged, wherein the slowly cooling time is 64 hours. And in the heating process, a stepping heating furnace is adopted for heating, the temperature of a heating section is 1274 ℃, the temperature of a soaking section is 1258 ℃, and the total heating time is 5.1h. The rough rolling procedure adopts a high-temperature large-reduction process, reduction passes are reduced as much as possible, and the single-pass reduction rate adopts mode distribution of increasing passes. And the finish rolling procedure adopts a high reduction system, and 4-pass rolling is completed. And a cooling procedure, wherein an ultra-fast cooling mode is adopted, so that the steel plate is directly quenched on line. The initial rolling temperature of the rough rolling procedure, the final rolling temperature of the rough rolling procedure, the initial rolling temperature of the finish rolling procedure, the final rolling temperature of the finish rolling procedure and the final cooling temperature of the cooling procedure are shown in a table 2, the tempering heat treatment procedure is carried out at the tempering temperature of 603 ℃, and the tempering time is 116min. The specification of the plate blank is 280mm, the specification of the intermediate blank is 140mm after the rough rolling process is finished, and the specification of the finished steel plate product is 90mm after the rolling process is finished.
Example 7
The chemical components and the mass percentage content of the steel plate are shown in a table 1, the production process of the steel plate comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment, the steel plate is obtained by rolling a plate blank, the production of the plate blank comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting and RH refining, so that molten steel is fully dehydrogenated, and the H content in the steel is obtained and is 0ppm (not detected by detection equipment). And in the continuous casting process, after the casting blank is off-line, slowly cooling is carried out for 72 hours. And in the heating process, a stepping heating furnace is adopted for heating, the temperature of a heating section is 1280 ℃, the temperature of a soaking section is 1260 ℃, and the total heating time is 5 hours. The rough rolling procedure adopts a high-temperature large-reduction process, reduction passes are reduced as much as possible, and the single-pass reduction rate is distributed in a mode of increasing passes. The finish rolling process adopts a high reduction system, and 4 times of rolling is completed. And a cooling procedure, wherein an ultra-fast cooling mode is adopted, so that the steel plate is directly quenched on line. The initial rolling temperature of the rough rolling procedure, the final rolling temperature of the rough rolling procedure, the initial rolling temperature of the finish rolling procedure, the final rolling temperature of the finish rolling procedure and the final cooling temperature of the cooling procedure are shown in a table 2, the tempering heat treatment procedure is carried out, the tempering temperature is 610 ℃, and the tempering time is 110min. The plate blank specification is 280mm in thickness, the intermediate blank specification is 140mm in thickness after the rough rolling process is finished, and the finished steel plate specification is 90mm in thickness after the rolling process is finished.
TABLE 1
TABLE 2
The microstructures obtained by directly quenching the steel plates in the examples 1 to 7 are martensite and a small amount of bainite, the microstructures obtained after tempering are tempered martensite and tempered bainite, the surface layers of the steel plates after tempering in the examples 1 to 7 are subjected to impact toughness and mechanical property detection in the length direction, and the detection results are shown in table 3. The core parts of the steel plates tempered in examples 1 to 7 were tested for impact toughness, mechanical properties in the longitudinal direction and mechanical properties in the thickness direction, and the test results are shown in Table 4. When the mechanical property of the steel plate is detected, the sample is processed into a standard tensile sample with the diameter of 10mm, and a tensile test is carried out. When mechanical properties in the length direction are detected, the sample is stretched along the length direction of the steel plate, when mechanical properties in the thickness direction are detected, the sample is stretched along the thickness direction of the steel plate, when impact toughness detection is performed on the surface layer of the steel plate, a sample is taken after the surface layer of the steel plate is removed by 2mm, and test detection is performed. The test item of the impact toughness of the steel plate is-40 ℃ impact energy Akv.
TABLE 3
TABLE 4
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 (6)
1. The production method of the high-strength and high-toughness thick steel plate comprises the working procedures of heating, rough rolling, finish rolling, cooling and tempering heat treatment, and is characterized in that the heating working procedure adopts a stepping heating furnace to heat, the temperature of a heating section is 1250-1280 ℃, the temperature of a soaking section is 1240-1260 ℃, and the total heating time is 5-6h;
in the rough rolling process, the plate blank specification is 280mm in thickness, the initial rolling temperature is 1100-1150 ℃, and the final rolling temperature is more than or equal to 980 ℃;
in the finish rolling process, the initial rolling temperature is less than or equal to 850 ℃, and the final rolling temperature is 800-820 ℃; in the cooling procedure, an ultra-fast cooling mode is adopted, so that the steel plate is directly quenched on line, the final cooling temperature is less than or equal to 200 ℃, and the specification of the finished steel plate after rolling is 90mm in thickness;
the tempering heat treatment process comprises the steps of tempering at 590-610 ℃ for 110-130min;
the steel plate comprises the following chemical components in percentage by mass: 0.03 to 0.05 percent of C, 1.50 to 1.70 percent of Mn, less than or equal to 0.003 percent of S, less than or equal to 0.012 percent of P, 0.25 to 0.35 percent of Si, 0.020 to 0.050 percent of Als, 0.025 to 0.050 percent of Nb, 0.05 to 0.07 percent of V, and the balance of Fe and inevitable impurities; the microstructure obtained after the steel plate is tempered and heat treated is tempered martensite and tempered bainite, the tensile strength is more than or equal to 570MPa, the yield strength is more than or equal to 460MPa, and the AKV at minus 40 ℃ is more than or equal to 200J.
2. The method for producing the high-strength and high-toughness thick steel plate as claimed in claim 1, wherein in the rough rolling process, a high-temperature high-reduction process is adopted in a rough rolling stage, reduction passes are reduced as much as possible, and a mode distribution of increasing passes is adopted in a single-pass reduction rate.
3. The method for producing a thick steel plate with high strength and toughness as claimed in claim 1, wherein said finish rolling step is performed by 4 passes of rolling using a high reduction system.
4. The method for producing the high-strength and high-toughness thick steel plate as claimed in claim 1, wherein the steel plate is obtained by slab rolling, the slab production comprises the procedures of converter smelting, LF refining, RH refining and continuous casting, and the RH refining procedure is used for fully dehydrogenating molten steel to ensure that the content of H in the steel is less than or equal to 2ppm.
5. The method for producing a thick steel plate with high strength and toughness according to claim 4, wherein in the continuous casting process, the casting blank is slowly cooled after being off-line, and the slow cooling time is not less than 48 hours.
6. The method for producing a thick gauge steel plate with high toughness according to any one of claims 1 to 5, wherein the thickness of the intermediate billet after the rough rolling process is 140mm.
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| CN202010960916.7A CN112342350B (en) | 2020-09-14 | 2020-09-14 | Production method of high-strength and high-toughness thick steel plate |
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| CN202010960916.7A CN112342350B (en) | 2020-09-14 | 2020-09-14 | Production method of high-strength and high-toughness thick steel plate |
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| CN117604223B (en) * | 2023-12-21 | 2024-08-16 | 河北普阳钢铁有限公司 | Production method of low-cost 370 MPa-level weather-resistant bridge steel plate |
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