CN111074156A - Ultrahigh-strength steel plate with excellent low-temperature toughness and production method thereof - Google Patents
Ultrahigh-strength steel plate with excellent low-temperature toughness and production method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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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
- 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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Abstract
The invention discloses an ultrahigh-strength steel plate with excellent low-temperature toughness and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: c: 0.16 to 0.19%, Si: less than or equal to 0.40 percent, Mn: 1.20-1.30%, P is less than or equal to 0.008%, S is less than or equal to 0.003%, Cr: 0.20 to 0.35%, Mo: 0.20 to 0.35%, Ni: 0.50-0.60%, Al: 0.020 to 0.040%, Nb: 0.020-0.040%, 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 has the characteristics of ultrahigh strength, excellent low-temperature toughness and uniform performance.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to an ultrahigh-strength steel plate with excellent low-temperature toughness and a production method thereof.
Background
The quenched and tempered high-strength steel with yield strength of more than 1100MPa is mainly used for key parts such as an arm support, a pulling plate and the like of a large crawler crane, has higher requirements on the aspects of mechanical property, surface quality, flatness and the like of a steel plate, and has the maximum thickness of 40 mm. At present, large-scale engineering machinery manufacturing enterprises in China mainly purchase and use the grade steel grade from abroad directly, or adopt parts such as a pulling plate, a suspension arm and the like which are processed and formed by the steel grade. In recent years, with the development of domestic and international conditions, the demand of ultrahigh strength steel plates is increasing from the viewpoint of safety, self weight reduction and energy consumption reduction in the engineering machinery industry, meanwhile, the manufacturing level of domestic manufacturing enterprises is continuously improved, the demand of purchasing steel plates for automatically processing parts is increasing, the annual demand is about 1500-2000 tons, and international grades of steel such as XAB1100 of the Tonsen Krupp company, WELDOX1100E of the SSAB company in Sweden, and HYD1100LE of the JFE company are mainly available. The WELDOX1300 is structural steel with highest strength in the world at present, has the minimum yield strength of 1300 MPa and high toughness, and can still ensure good impact toughness at the temperature of minus 40 ℃.
At present, SSAB and JFE are mainly used for forming stable supply in batches in China, and the domestic engineering machinery manufacturers are easily influenced by factors such as high price, long order cycle, and incapability of meeting use requirements due to unevenness of part of steel plates, so the domestic engineering machinery manufacturers also have the willingness to adopt domestic steel plates.
Under the background, a quenched and tempered ultrahigh-strength steel plate with excellent low-temperature toughness is developed through optimized component design and process improvement.
Disclosure of Invention
The invention aims to solve the technical problem of providing an ultrahigh-strength steel plate with excellent low-temperature toughness; the invention also provides a production method of the ultrahigh-strength steel plate with excellent low-temperature toughness.
In order to solve the technical problems, the invention adopts the technical scheme that: the ultrahigh-strength steel plate with excellent low-temperature toughness comprises the following chemical components in percentage by mass: c: 0.16 to 0.19%, Si: less than or equal to 0.40 percent, Mn: 1.20-1.30%, P is less than or equal to 0.008%, S is less than or equal to 0.003%, Cr: 0.20 to 0.35%, Mo: 0.20 to 0.35%, Ni: 0.50-0.60%, Al: 0.020 to 0.040%, Nb: 0.020-0.040%, and the balance of Fe and inevitable impurities;
the thickness of the steel plate is 8-25 mm.
The hardness of the steel plate of the invention is as follows: yield strength is more than or equal to 1100MPa, tensile strength: 1200-1500MPa, the elongation is more than or equal to 10 percent, and the average value of the impact energy at minus 40 ℃ is more than or equal to 36J.
The invention also provides a production method of the ultrahigh-strength steel plate with excellent low-temperature toughness, which comprises the working procedures of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment; the rolling procedure adopts a two-stage rolling process, wherein the first stage is a recrystallization zone, and the second stage is a non-recrystallization zone; the heat treatment process adopts a quenching and tempering treatment process.
According to the smelting process, molten steel is smelted by an electric furnace until the P content is less than or equal to 0.010 percent, and then the molten steel is sent into an LF furnace for refining and component adjustment, wherein the total refining time is more than or equal to 70min, the white slag retention time is more than or equal to 30min, and good slagging is ensured; then transferring into a vacuum degassing furnace (VD furnace) for vacuum treatment, wherein the vacuum degree is less than or equal to 66Pa, the vacuum retention time is more than or equal to 25min, and hoisting after soft blowing for 10-15 min.
In the continuous casting process, the smelted molten steel is subjected to continuous casting operation to obtain a continuous casting blank; and (4) cleaning the defects of cracks, subcutaneous bubbles and the like on the surface of the steel blank by using flame cleaning.
The heating process comprises the step of heating a casting blank soaking furnace, wherein the maximum heating temperature is 1260 ℃, the soaking temperature is 1220-1240 ℃, and a certain section of burner is not allowed to be completely closed in the heating process.
In the rolling procedure, the initial rolling temperature of the first stage is 1080-1120 ℃, the final rolling temperature is 950-980 ℃, the single-pass reduction is 15-25%, the accumulated reduction is 35-50%, and the reduction is increased as much as possible by temperature-controlled rolling; the second stage is at the initial rolling temperature of not more than 880 ℃, the final rolling temperature of 800-840 ℃, the steel airing thickness is 3 times of the steel plate thickness, the accumulated reduction rate is 30-55%, and the single-pass reduction rate is not less than 3 passes with the single-pass reduction rate of not less than 10%.
According to the cooling process after rolling, the steel plate is cooled to room temperature after rolling, so that the good plate shape of the steel plate is ensured.
In the heat treatment process, the quenching temperature is 890-910 ℃, the heat preservation time is PLC +30min, and water is cooled to room temperature after quenching; the tempering temperature is 180-210 ℃, the heat preservation time is 4.5min/mm (namely, according to the millimeter of the thickness of the steel plate, the heating time is 4.0 min/mm), and the finished steel plate is prepared by air cooling after tempering.
The invention relates to a method for detecting the performance of an ultrahigh-strength steel plate with excellent low-temperature toughness, which is based on GB/T231.1 and GB/T229 standards.
The room temperature of the invention is 0-40 ℃.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
1. the invention obtains uniform and fine organization structure and excellent mechanical property by adjusting components such as C, Mn, Cr, Mo, Ni, strictly controlling the content of impurity elements such as P, S and adopting proper process technologies such as smelting, heating, rolling, heat treatment and the like.
2. The hardness of the steel plate obtained by the invention is as follows: yield strength is more than or equal to 1100MPa, tensile strength: 1200-1500MPa, the elongation is more than or equal to 10 percent, and the average value of the impact energy at minus 40 ℃ is more than or equal to 36J.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The thickness of the steel plate with ultrahigh hardness and excellent low-temperature toughness is 8mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.16%, Si: 0.35%, Mn: 1.25%, P: 0.008%, S: 0.002%, Cr: 0.28%, Mo: 0.24%, Ni: 0.52%, Al: 0.026%, Nb: 0.025%, and the balance of Fe and inevitable impurities.
The production method of the quenched and tempered ultrahigh-strength steel plate with excellent low-temperature toughness comprises the following steps of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: smelting molten steel by an electric furnace to P: sending the slag into an LF furnace for refining after the slag content is 0.009%, adjusting components, wherein the total refining time is 75min, the white slag retention time is 30min, and ensuring good slagging; then transferring the mixture into a vacuum degassing furnace (VD furnace) for vacuum treatment, keeping the vacuum degree at 66Pa for 25min, and carrying out soft blowing for 10min and then hoisting;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; the defects of cracks, subcutaneous bubbles and the like existing on the surface of the steel blank are cleaned by using flame cleaning;
(3) a heating procedure: heating the casting blank in a soaking furnace, wherein the maximum heating temperature is 1260 ℃, and the soaking temperature is 1240 ℃;
(4) a rolling procedure: a two-stage rolling process is adopted, wherein the first stage is a recrystallization zone, and the second stage is a non-recrystallization zone; in the first stage, the initial rolling temperature is 1080 ℃, the final rolling temperature is 950 ℃, the maximum single-pass reduction is 20 percent, and the cumulative reduction rate is 45 percent; in the second stage, the initial rolling temperature is 880 ℃, the final rolling temperature is 840 ℃, the steel airing thickness is 3 times of the thickness of the steel plate, the accumulated reduction rate is 55 percent, the single-pass reduction rate is 12 percent for 3 passes, and the semi-finished steel plate is obtained after rolling;
(5) and (3) cooling after rolling: air cooling the semi-finished steel plate to room temperature after rolling;
(6) a heat treatment process: adopting quenching and tempering treatment processes, wherein the quenching temperature is 890 ℃, the heat preservation time is PLC +30min, and water cooling is carried out to the room temperature after quenching; tempering temperature is 180 ℃, heat preservation time is 4.5min/mm, and air cooling is carried out after tempering to obtain the finished steel plate.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 1132MPa, tensile strength: 1289MPa, elongation: 12%, -40 ℃ average value of the impact energy: 56J.
Example 2
The thickness of the steel plate with ultrahigh hardness and excellent low-temperature toughness is 12mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.18%, Si: 0.31%, Mn: 1.22%, P: 0.008%, S: 0.002%, Cr: 0.27%, Mo: 0.35%, Ni: 0.51%, Al: 0.020%, Nb: 0.027%, the balance being Fe and unavoidable impurities.
The production method of the quenched and tempered ultrahigh-strength steel plate with excellent low-temperature toughness comprises the following steps of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: smelting molten steel by an electric furnace to P: feeding the obtained product into an LF furnace for refining after the content of the obtained product is 0.010 percent, and adjusting components, wherein the total refining time is 72min, and the white slag retention time is 35min, so as to ensure good slagging; then transferring the mixture into a vacuum degassing furnace (VD furnace) for vacuum treatment, keeping the vacuum degree at 66Pa for 30min, and carrying out soft blowing for 15min and then hoisting;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; the defects of cracks, subcutaneous bubbles and the like existing on the surface of the steel blank are cleaned by using flame cleaning;
(3) a heating procedure: heating the casting blank in a soaking furnace, wherein the maximum heating temperature is 1260 ℃, and the soaking temperature is 1230 ℃;
(4) a rolling procedure: a two-stage rolling process is adopted, wherein the first stage is a recrystallization zone, and the second stage is a non-recrystallization zone; in the first stage, the initial rolling temperature is 1100 ℃, the final rolling temperature is 980 ℃, the maximum single-pass reduction is 15 percent, and the cumulative reduction rate is 40 percent; in the second stage, the initial rolling temperature is 860 ℃, the final rolling temperature is 820 ℃, the airing thickness is 3 times of the thickness of the steel plate, the accumulated reduction rate is 55 percent, the single-pass reduction rate is 15 percent and 4 passes are carried out, and the semi-finished steel plate is obtained after rolling;
(5) and (3) cooling after rolling: air cooling the semi-finished steel plate to room temperature after rolling;
(6) a heat treatment process: adopting quenching and tempering treatment processes, wherein the quenching temperature is 910 ℃, the heat preservation time is PLC +30min, and water cooling is carried out to the room temperature after quenching; tempering temperature is 180 ℃, heat preservation time is 4.5min/mm, and air cooling is carried out after tempering to obtain the finished steel plate.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 1100MPa, tensile strength: 1312MPa, elongation: 11%, -40 ℃ impact work average: 52J.
Example 3
The thickness of the steel plate with ultrahigh hardness and excellent low-temperature toughness is 18mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.19%, Si: 0.32%, Mn: 1.30%, P: 0.007%, S: 0.001%, Cr: 0.30%, Mo: 0.32%, Ni: 0.57%, Al: 0.032%, Nb: 0.032%, and the balance Fe and inevitable impurities.
The production method of the quenched and tempered ultrahigh-strength steel plate with excellent low-temperature toughness comprises the following steps of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: smelting molten steel by an electric furnace to P: sending the slag into an LF furnace for refining after the slag content is 0.007%, adjusting components, wherein the total refining time is 70min, the white slag retention time is 30min, and ensuring good slagging; then transferring the mixture into a vacuum degassing furnace (VD furnace) for vacuum treatment, keeping the vacuum degree at 66Pa for 25min, and carrying out soft blowing for 10min and then hoisting;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; the defects of cracks, subcutaneous bubbles and the like existing on the surface of the steel blank are cleaned by using flame cleaning;
(3) a heating procedure: heating the casting blank in a soaking furnace, wherein the maximum heating temperature is 1260 ℃, and the soaking temperature is 1220 ℃;
(4) a rolling procedure: a two-stage rolling process is adopted, wherein the first stage is a recrystallization zone, and the second stage is a non-recrystallization zone; in the first stage, the initial rolling temperature is 1080 ℃, the final rolling temperature is 950 ℃, the maximum single-pass reduction is 16 percent, and the cumulative reduction rate is 50 percent; in the second stage, the initial rolling temperature is 850 ℃, the final rolling temperature is 800 ℃, the steel airing thickness is 3 times of the thickness of the steel plate, the accumulated reduction rate is 50 percent, the single-pass reduction rate is 10 percent and is 3 passes, and a semi-finished steel plate is obtained after rolling;
(5) and (3) cooling after rolling: air cooling the semi-finished steel plate to room temperature after rolling;
(6) a heat treatment process: adopting quenching and tempering treatment processes, wherein the quenching temperature is 900 ℃, the heat preservation time is PLC +30min, and cooling to room temperature after quenching; tempering temperature is 200 ℃, heat preservation time is 4.5min/mm, and air cooling is carried out after tempering to obtain the finished steel plate.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 1141MPa, tensile strength: 1200MPa, elongation: 10%, -40 ℃ average value of the impact energy: 45J.
Example 4
The thickness of the steel plate with ultrahigh hardness and excellent low-temperature toughness is 20mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.18%, Si: 0.35%, Mn: 1.25%, P: 0.007%, S: 0.002%, Cr: 0.32%, Mo: 0.28%, Ni: 0.60%, Al: 0.023%, Nb: 0.020%, and the balance of Fe and inevitable impurities.
The production method of the quenched and tempered ultrahigh-strength steel plate with excellent low-temperature toughness comprises the following steps of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: smelting molten steel by an electric furnace to P: sending the slag into an LF furnace for refining after the slag content is 0.008 percent, adjusting components, and ensuring good slagging, wherein the total refining time is 70min, and the white slag retention time is 35 min; then transferring the mixture into a vacuum degassing furnace (VD furnace) for vacuum treatment, wherein the vacuum degree is 66Pa, the vacuum retention time is 32min, and the ladle is hung after soft blowing is carried out for 13 min;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; the defects of cracks, subcutaneous bubbles and the like existing on the surface of the steel blank are cleaned by using flame cleaning;
(3) a heating procedure: heating the casting blank in a soaking furnace, wherein the maximum heating temperature is 1260 ℃, and the soaking temperature is 1240 ℃;
(4) a rolling procedure: a two-stage rolling process is adopted, wherein the first stage is a recrystallization zone, and the second stage is a non-recrystallization zone; in the first stage, the initial rolling temperature is 1120 ℃, the final rolling temperature is 970 ℃, the maximum single-pass reduction is 20 percent, and the cumulative reduction rate is 40 percent; in the second stage, the initial rolling temperature is 880 ℃, the final rolling temperature is 840 ℃, the steel airing thickness is 3 times of the thickness of the steel plate, the accumulated reduction rate is 40 percent, the single-pass reduction rate is 15 percent and is 3 passes, and the semi-finished steel plate is obtained after rolling;
(5) and (3) cooling after rolling: air cooling the semi-finished steel plate to room temperature after rolling;
(6) a heat treatment process: adopting quenching and tempering treatment processes, wherein the quenching temperature is 900 ℃, the heat preservation time is PLC +30min, and cooling to room temperature after quenching; tempering temperature is 200 ℃, heat preservation time is 4.5min/mm, and air cooling is carried out after tempering to obtain the finished steel plate.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 1151MPa, tensile strength: 1278MPa, elongation: 12%, -40 ℃ average value of the impact energy: 62J.
Example 5
The thickness of the steel plate with ultrahigh hardness and excellent low-temperature toughness is 25mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.19%, Si: 0.37%, Mn: 1.30%, P: 0.006%, S: 0.001%, Cr: 0.35%, Mo: 0.30%, Ni: 0.56%, Al: 0.031%, Nb: 0.030%, and the balance being Fe and unavoidable impurities.
The production method of the quenched and tempered ultrahigh-strength steel plate with excellent low-temperature toughness comprises the following steps of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: smelting molten steel by an electric furnace to P: sending the slag into an LF furnace for refining after the slag content is 0.008 percent, adjusting components, and ensuring that the total refining time is 75min, the white slag retention time is 32min and good slagging is ensured; then transferring the mixture into a vacuum degassing furnace (VD furnace) for vacuum treatment, keeping the vacuum degree at 65Pa for 35min, and carrying out soft blowing for 10min and then hoisting;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; the defects of cracks, subcutaneous bubbles and the like existing on the surface of the steel blank are cleaned by using flame cleaning;
(3) a heating procedure: heating the casting blank in a soaking furnace, wherein the maximum heating temperature is 1260 ℃, and the soaking temperature is 1220 ℃;
(4) a rolling procedure: a two-stage rolling process is adopted, wherein the first stage is a recrystallization zone, and the second stage is a non-recrystallization zone; in the first stage, the initial rolling temperature is 1080 ℃, the final rolling temperature is 975 ℃, the maximum single-pass reduction is 16 percent, and the cumulative reduction rate is 50 percent; in the second stage, the initial rolling temperature is 850 ℃, the final rolling temperature is 810 ℃, the steel airing thickness is 3 times of the thickness of the steel plate, the accumulated reduction rate is 50 percent, the single-pass reduction rate is 10 percent and 4 passes are carried out, and the semi-finished steel plate is obtained after rolling;
(5) and (3) cooling after rolling: air cooling the semi-finished steel plate to room temperature after rolling;
(6) a heat treatment process: adopting quenching and tempering treatment processes, wherein the quenching temperature is 910 ℃, the heat preservation time is PLC +30min, and water cooling is carried out to the room temperature after quenching; tempering temperature is 180 ℃, heat preservation time is 4.5min/mm, and air cooling is carried out after tempering to obtain the finished steel plate.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 1142MPa, tensile strength: 1200MPa, elongation: 10%, -40 ℃ average value of the impact energy: 45J.
Example 6
The thickness of the steel plate with ultrahigh hardness and excellent low-temperature toughness is 8mm, and the steel plate comprises the following chemical components in percentage by mass: c: 0.16%, Si: 0.40%, Mn: 1.20%, P: 0.008%, S: 0.003%, Cr: 0.20%, Mo: 0.20%, Ni: 0.50%, Al: 0.040%, Nb: 0.040%, the balance being Fe and unavoidable impurities.
The production method of the quenched and tempered ultrahigh-strength steel plate with excellent low-temperature toughness comprises the following steps of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment, and the specific process steps are as follows:
(1) smelting: smelting molten steel by an electric furnace to P: sending the slag into an LF furnace for refining after the slag content is 0.009%, adjusting components, wherein the total refining time is 75min, the white slag retention time is 30min, and ensuring good slagging; then transferring the mixture into a vacuum degassing furnace (VD furnace) for vacuum treatment, keeping the vacuum degree at 66Pa for 25min, and carrying out soft blowing for 10min and then hoisting;
(2) and (3) continuous casting process: carrying out continuous casting operation on the smelted molten steel to obtain a continuous casting blank; the defects of cracks, subcutaneous bubbles and the like existing on the surface of the steel blank are cleaned by using flame cleaning;
(3) a heating procedure: heating the casting blank in a soaking furnace, wherein the maximum heating temperature is 1260 ℃, and the soaking temperature is 1240 ℃;
(4) a rolling procedure: a two-stage rolling process is adopted, wherein the first stage is a recrystallization zone, and the second stage is a non-recrystallization zone; in the first stage, the initial rolling temperature is 1080 ℃, the final rolling temperature is 950 ℃, the maximum single-pass reduction is 25 percent, and the cumulative reduction rate is 35 percent; in the second stage, the initial rolling temperature is 880 ℃, the final rolling temperature is 840 ℃, the steel airing thickness is 3 times of the thickness of the steel plate, the accumulated reduction rate is 30 percent, the single-pass reduction rate is 12 percent and 4 passes are carried out, and the semi-finished steel plate is obtained after rolling;
(5) and (3) cooling after rolling: air cooling the semi-finished steel plate to room temperature after rolling;
(6) a heat treatment process: adopting quenching and tempering treatment processes, wherein the quenching temperature is 890 ℃, the heat preservation time is PLC +30min, and water cooling is carried out to the room temperature after quenching; tempering temperature is 210 ℃, heat preservation time is 4.5min/mm, and air cooling is carried out after tempering to obtain the finished steel plate.
The mechanical properties of the steel plate of the embodiment are as follows: yield strength: 1350MPa, tensile Strength: 1500MPa, elongation: 12%, -40 ℃ average value of the impact energy: 36J.
The room temperature in examples 1 to 6 of the present invention means 0 to 40 ℃.
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 ultrahigh-strength steel plate with excellent low-temperature toughness is characterized by comprising the following chemical components in percentage by mass: c: 0.16 to 0.19%, Si: less than or equal to 0.40 percent, Mn: 1.20-1.30%, P is less than or equal to 0.008%, S is less than or equal to 0.003%, Cr: 0.20 to 0.35%, Mo: 0.20 to 0.35%, Ni: 0.50-0.60%, Al: 0.020 to 0.040%, Nb: 0.020-0.040%, and the balance of Fe and inevitable impurities.
2. An ultra-high strength steel plate with excellent cryogenic temperature toughness as claimed in claim 1, wherein the thickness of said steel plate is 8-25 mm.
3. The ultra-high strength steel plate with excellent cryogenic temperature toughness as claimed in claim 1, wherein the steel plate has yield strength of 1100MPa or more, tensile strength of 1200-1500MPa, elongation of 10% or more, and average value of-40 ℃ impact energy of 36J or more.
4. A method for producing an ultra-high strength steel plate having excellent cryogenic temperature toughness according to any one of claims 1 to 3, comprising the steps of smelting, continuous casting, heating, rolling, cooling after rolling and heat treatment; the rolling procedure adopts a two-stage rolling process, wherein the first stage is a recrystallization zone, and the second stage is a non-recrystallization zone; the heat treatment process adopts a quenching and tempering treatment process.
5. The method for producing the ultrahigh-strength steel plate with excellent low-temperature toughness according to claim 4, wherein in the smelting process, molten steel is smelted in an electric furnace to P less than or equal to 0.010 percent and then is sent into an LF furnace for refining and component adjustment, the total refining time is more than or equal to 70min, the white slag holding time is more than or equal to 30min, and good slagging is ensured; then transferring the mixture into a vacuum degassing furnace, namely a VD furnace, carrying out vacuum treatment, wherein the vacuum degree is less than or equal to 66Pa, the vacuum retention time is more than or equal to 25min, and hoisting the bag after soft blowing is carried out for 10-15 min.
6. The method for producing an ultra-high strength steel plate with excellent cryogenic temperature toughness as claimed in claim 4, wherein the heating step comprises heating the casting blank in a soaking furnace at a maximum heating temperature of 1260 ℃, a soaking temperature of 1220 to 1240 ℃, and the total closing of a certain section of burner is not allowed in the heating process.
7. The method for producing an ultrahigh-strength steel plate with excellent low-temperature toughness as claimed in claim 4, wherein the rolling step comprises a first-stage rolling temperature of 1080-1120 ℃, a final rolling temperature of 950-980 ℃, a single-pass reduction of 15-25%, a cumulative reduction of 35-50%, and a rolling reduction increase due to temperature-controlled rolling.
8. The method for producing the ultrahigh-strength steel plate with excellent low-temperature toughness as claimed in claim 4, wherein the second-stage start rolling temperature is not more than 880 ℃, the final rolling temperature is 800-.
9. The method of claim 4, wherein the cooling step after rolling is performed to cool the steel plate to room temperature after rolling.
10. The method for producing an ultra-high strength steel plate with excellent cryogenic temperature toughness as claimed in claim 4, wherein the heat treatment step comprises the steps of quenching at 890-910 ℃ for PLC +30min, and cooling the plate to room temperature after quenching; tempering temperature is 180-210 ℃, heat preservation time is 4.5min/mm, and air cooling is carried out after tempering to obtain the finished steel plate.
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