CN110616369B - Large-thickness steel plate with yield of 785MPa grade for ocean engineering and production method thereof - Google Patents
Large-thickness steel plate with yield of 785MPa grade for ocean engineering and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- 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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
The invention discloses a large-thickness steel plate with yield of 785MPa and a production method thereof for ocean engineering, wherein the steel plate comprises the following chemical components in percentage by mass: c: 0.07 to 0.10%, Si: 0.20 to 0.50%, Mn: 0.80-1.00%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, Ni: 7.00-8.00%, Cr: 0.60-0.80%, Mo: 0.60-0.80%, V: 0.06-0.08%, Al: 0.020-0.050% and the balance of Fe and inevitable impurities; the production method comprises the working procedures of heating, rolling and heat treatment. According to the invention, through reasonable chemical component design and rolling and heat treatment processes, the yield strength of the obtained steel plate is more than or equal to 785MPa, the tensile strength is more than or equal to 870MPa, the longitudinal impact energy at minus 60 ℃ is more than or equal to 70J, and the thickness is 180-200 mm.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a large-thickness steel plate with yield of 785MPa and for ocean engineering and a production method thereof.
Background
The national key technology which seriously restricts the marine equipment in China is to be developed vigorously, the steel for large-thickness marine engineering is mainly applied to large marine equipment such as a marine oil production platform, a wind power installation ship and the like, the marine equipment needs to bear severe service environments such as sea storms, sea undercurrents, atmospheric erosion and the like along with the deepening of a working sea area, so the thickness, the strength, the toughness and the like of the used steel plate are gradually improved, the prior common material is a steel plate with the yield of 690MPa grade and the impact temperature of-40 ℃, the steel plate is gradually developed to a large-thickness steel plate with the yield strength of 785MPa and the impact energy requirement of-60 ℃ low-temperature toughness, the large-thickness steel plate realizes the high yield strength, the impact energy at-60 ℃ is very difficult, no factory in China can produce at present, the development of the marine equipment manufacture in China is seriously influenced, and the large-thickness marine steel plate with the yield strength of 785MPa grade is researched and developed, has important significance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a large-thickness steel plate with yield of 785MPa for ocean engineering; the invention also provides a production method of the large-thickness steel plate with yield of 785MPa for ocean engineering. According to the invention, through reasonable chemical composition design and control of rolling and heat treatment processes, the ocean engineering steel with large thickness of 180-200 mm and yield strength of 785MPa can be obtained, has good low-temperature impact toughness, and can be applied to various large ocean engineering key equipment.
In order to solve the technical problems, the invention adopts the technical scheme that: a785 MPa-yield large-thickness steel plate for ocean engineering comprises the following chemical components in percentage by mass: c: 0.07 to 0.10%, Si: 0.20 to 0.50%, Mn: 0.80-1.00%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, Ni: 7.00-8.00%, Cr: 0.60-0.80%, Mo: 0.60-0.80%, V: 0.060 to 0.080%, Al: 0.020-0.050%, and the balance of Fe and inevitable impurities.
The thickness of the steel plate is 180-200 mm.
The yield strength of the steel plate is more than or equal to 785MPa, the tensile strength is more than or equal to 870MPa, and the impact energy of the V-shaped transverse at-60 ℃ is more than or equal to 70J.
The invention also provides a production method of the large-thickness steel plate with yield of 785MPa for ocean engineering, which comprises the working procedures of heating, rolling and heat treatment; the heat treatment process adopts quenching and tempering processes, wherein the quenching temperature is 900-930 ℃, the heat preservation time is 3-4 min/min, the tempering temperature is 600-630 ℃, and the total tempering heating time is 5-6 min/mm.
According to the heating process, the furnace temperature before the steel ingot is charged is less than or equal to 300 ℃, the steel is braised for 3-5 hours after the steel ingot is charged, then the heating is started, the heating rate is 65-80 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the maximum heating temperature is less than or equal to 1220 ℃, the total heating time is more than or equal to 30 hours, and the heat preservation time is more than or equal to 20 hours.
The rolling procedure adopts a type II controlled rolling process, the first stage is an austenite recrystallization stage, the rolling temperature is 950-1100 ℃, and the pass reduction rate is 15-20%.
The rolling procedure adopts a type II controlled rolling process, the second stage is an austenite non-recrystallization stage, the initial rolling temperature is 860-880 ℃, and the final rolling temperature is 820-840 ℃.
The invention has the effects of various chemical components and contents:
c: 0.07-0.10%, carbon has obvious influence on various properties of steel, especially the strength, impact toughness and welding performance of the steel, the steel has low hardness and low strength due to too low carbon content, the smelting control difficulty is increased, and the impact toughness and the welding performance of the steel are reduced due to too high carbon content.
Si: 0.20-0.50%, wherein silicon is a main reducing agent and a deoxidizing agent in the steelmaking process, can obviously improve the elastic limit, yield point and tensile strength of steel, but when the content of Si exceeds 0.5%, the toughness and welding performance of the steel are reduced.
Mn: 0.80-1.00%, manganese is a good deoxidizer and desulfurizer, and can increase the toughness, strength and hardness of steel, improve the hardenability of steel and improve the hot workability of steel; however, too high manganese content weakens the corrosion resistance of the steel and reduces the weldability.
P is less than or equal to 0.010 percent and S is less than or equal to 0.005 percent, phosphorus and sulfur are harmful elements in steel under general conditions, and phosphorus increases the cold brittleness of the steel, reduces the plasticity and deteriorates the cold bending property; the sulfur increases the hot brittleness of the steel, reduces the ductility and the toughness of the steel, and reduces the content of phosphorus and sulfur in the steel as much as possible under the condition of reasonable cost control.
Ni: 7.00-8.00%, nickel can improve the hardenability and low-temperature toughness of steel, obviously reduce the ductile-brittle transformation temperature, and meanwhile, the nickel has a certain solid solution strengthening effect, can inhibit the formation of coarse pro-eutectoid ferrite, refine ferrite grains, influence the diffusion speed of carbon and alloy elements, prevent the formation of pearlite, and slow down the hardening and cracking tendency during welding.
Cr: 0.60-0.80%, wherein the chromium can improve the hardenability of the steel and improve the uniformity of the performance of the steel plate in the thickness direction, but the chromium is added too high, so that the chromium and the manganese can form low-melting-point Cr-Mn composite oxides, surface cracks are formed in the hot working process, and the welding performance is reduced.
Mo: 0.60-0.80%, and the molybdenum greatly improves the strength, the plasticity and the low-temperature impact toughness, because Mo can make the C curve of the steel shift to the right when being dissolved in ferrite and austenite in a solid manner, thereby obviously improving the hardenability of the steel; and the molybdenum can obviously improve the recrystallization temperature of the steel, and the toughness of the steel can also be improved by adding a certain amount of molybdenum.
V: 0.060-0.080 percent of vanadium, the vanadium can refine grains in steel, the strength and the toughness of the steel are improved, and the hydrogen corrosion resistance of carbide formed by the vanadium and carbon can be improved at high temperature and high pressure.
Al: 0.020-0.050% of aluminum, wherein the aluminum is a common deoxidizer in steel, a small amount of aluminum is added into the steel, crystal grains can be refined, impact toughness is improved, the aluminum also has oxidation resistance and corrosion resistance, and the hot workability, welding performance and cutting workability of the steel are affected if the content of the aluminum is too high.
The beneficial effect that adopts above-mentioned technical scheme to produce lies in: 1. the invention obtains the steel plate with 785MPa grade yield strength for ocean engineering by reasonable chemical component design and control of rolling and heat treatment processes, has good low-temperature impact toughness, and can be applied to various large ocean engineering key equipment. 2. The large-thickness steel plate for ocean engineering produced by the invention has yield strength of more than or equal to 785MPa, tensile strength of more than or equal to 870MPa, longitudinal impact energy of more than or equal to 70J at minus 60 ℃, thickness specification of 180-200 mm, high production difficulty and international leading position.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The thickness of the 785MPa grade large-thickness steel plate for ocean engineering in the embodiment is 180mm, and the chemical component compositions and the mass percentage contents are shown in Table 1.
The production method of the 785 MPa-yield large-thickness steel plate for ocean engineering comprises the working procedures of heating, rolling and heat treatment, and comprises the following specific process steps:
(1) a heating procedure: the furnace temperature before the steel ingot is charged is 260 ℃, the steel is braised for 4h after the steel ingot is charged, then the heating is started, the heating speed is 75 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the maximum heating temperature is 1220 ℃, the total heating time is 30h, and the heat preservation time is 20 h;
(2) a rolling procedure: a II-type controlled rolling process is adopted, the first stage is an austenite recrystallization stage, the rolling temperature is 1064 ℃, and the pass reduction rate is 18%; the second stage is an austenite non-recrystallization stage, the initial rolling temperature is 875 ℃ and the final rolling temperature is 832 ℃;
(3) a heat treatment process: the quenching and tempering process is adopted, the quenching temperature is 915 ℃, the heat preservation time is 3min/min, the tempering temperature is 626 ℃, and the total tempering heating time is 5 min/mm.
The properties of the steel plate for oceanographic engineering with 785MPa grade yield and large thickness in the embodiment are shown in Table 2.
Example 2
The thickness of the 785MPa grade large-thickness steel plate for ocean engineering in the embodiment is 190mm, and the chemical component compositions and the mass percentage contents are shown in Table 1.
The production method of the 785 MPa-yield large-thickness steel plate for ocean engineering comprises the working procedures of heating, rolling and heat treatment, and comprises the following specific process steps:
(1) a heating procedure: the furnace temperature before the steel ingot is charged is 300 ℃, the steel ingot is braised for 3h after being charged, then heating is started, the temperature rise speed is 80 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the maximum heating temperature is 1218 ℃, the total heating time is 36h, and the heat preservation time is 20 h;
(2) a rolling procedure: a II-type controlled rolling process is adopted, the first stage is an austenite recrystallization stage, the rolling temperature is 1100 ℃, and the pass reduction rate is 15%; the second stage is an austenite non-recrystallization stage, wherein the initial rolling temperature is 880 ℃, and the final rolling temperature is 840 ℃;
(3) a heat treatment process: the quenching and tempering process is adopted, the quenching temperature is 900 ℃, the heat preservation time is 4min/min, the tempering temperature is 620 ℃, and the total tempering heating time is 6 min/mm.
The properties of the steel plate for oceanographic engineering with 785MPa grade yield and large thickness in the embodiment are shown in Table 2.
Example 3
The thickness of the 785MPa grade large-thickness steel plate for ocean engineering in the embodiment is 200mm, and the chemical component compositions and the mass percentage contents are shown in Table 1.
The production method of the 785 MPa-yield large-thickness steel plate for ocean engineering comprises the working procedures of heating, rolling and heat treatment, and comprises the following specific process steps:
(1) a heating procedure: the furnace temperature before the steel ingot is charged is 260 ℃, the steel is braised for 5h after the steel ingot is charged, then the heating is started, the heating speed is 74 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the maximum heating temperature is 1220 ℃, the total heating time is 39h, and the heat preservation time is 20 h;
(2) a rolling procedure: a II-type controlled rolling process is adopted, the first stage is an austenite recrystallization stage, the rolling temperature is 950 ℃, and the pass reduction rate is 20%; the second stage is an austenite non-recrystallization stage, wherein the initial rolling temperature is 860 ℃, and the final rolling temperature is 820 ℃;
(3) a heat treatment process: the quenching and tempering process is adopted, the quenching temperature is 930 ℃, the heat preservation time is 3min/min, the tempering temperature is 600 ℃, and the total tempering heating time is 5 min/mm.
The properties of the steel plate for oceanographic engineering with 785MPa grade yield and large thickness in the embodiment are shown in Table 2.
Example 4
The thickness of the 785MPa grade large-thickness steel plate for ocean engineering in the embodiment is 190mm, and the chemical component compositions and the mass percentage contents are shown in Table 1.
The production method of the 785 MPa-yield large-thickness steel plate for ocean engineering comprises the working procedures of heating, rolling and heat treatment, and comprises the following specific process steps:
(1) a heating procedure: the furnace temperature before the steel ingot is charged is 280 ℃, the steel is braised for 4h after the steel ingot is charged, then the heating is started, the heating speed is 70 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the maximum heating temperature is 1210 ℃, the total heating time is 36h, and the heat preservation time is 22 h;
(2) a rolling procedure: a II-type controlled rolling process is adopted, the first stage is an austenite recrystallization stage, the rolling temperature is 980 ℃, and the pass reduction rate is 18%; the second stage is an austenite non-recrystallization stage, wherein the initial rolling temperature is 870 ℃, and the final rolling temperature is 830 ℃;
(3) a heat treatment process: the quenching and tempering process is adopted, the quenching temperature is 920 ℃, the heat preservation time is 3min/min, the tempering temperature is 620 ℃, and the total tempering heating time is 5 min/mm.
The properties of the steel plate for oceanographic engineering with 785MPa grade yield and large thickness in the embodiment are shown in Table 2.
Example 5
The thickness of the 785 MPa-yield large-thickness steel plate for ocean engineering in the embodiment is 194mm, and the chemical component compositions and the mass percentage contents of the steel plate are shown in Table 1.
The production method of the 785 MPa-yield large-thickness steel plate for ocean engineering comprises the working procedures of heating, rolling and heat treatment, and comprises the following specific process steps:
(1) a heating procedure: the furnace temperature of the steel ingot before charging is 270 ℃, the steel ingot is braised for 3.5h after charging, then heating is started, the heating speed is 72 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the maximum heating temperature is 1215 ℃, the total heating time is 32h, and the heat preservation time is 25 h;
(2) a rolling procedure: a II-type controlled rolling process is adopted, the first stage is an austenite recrystallization stage, the rolling temperature is 1000 ℃, and the pass reduction rate is 17%; the second stage is an austenite non-recrystallization stage, wherein the initial rolling temperature is 865 ℃, and the final rolling temperature is 825 ℃;
(3) a heat treatment process: the quenching and tempering processes are adopted, the quenching temperature is 910 ℃, the heat preservation time is 3.5min/min, the tempering temperature is 610 ℃, and the total tempering heating time is 5.5 min/mm.
The properties of the steel plate for oceanographic engineering with 785MPa grade yield and large thickness in the embodiment are shown in Table 2.
Example 6
The thickness of the 785 MPa-yield large-thickness steel plate for ocean engineering in the embodiment is 186mm, and the chemical component compositions and the mass percentage contents of the steel plate are shown in Table 1.
The production method of the 785 MPa-yield large-thickness steel plate for ocean engineering comprises the working procedures of heating, rolling and heat treatment, and comprises the following specific process steps:
(1) a heating procedure: the furnace temperature before the steel ingot is charged is 290 ℃, the steel is braised for 4.5h after the steel ingot is charged, then the heating is started, the heating speed is 77 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the maximum heating temperature is 1208 ℃, the total heating time is 35h, and the heat preservation time is 23 h;
(2) a rolling procedure: a II-type controlled rolling process is adopted, the first stage is an austenite recrystallization stage, the rolling temperature is 1050 ℃, and the pass reduction rate is 19%; the second stage is an austenite non-recrystallization stage, wherein the initial rolling temperature is 862 ℃ and the final rolling temperature is 835 ℃;
(3) a heat treatment process: the quenching and tempering process is adopted, the quenching temperature is 925 ℃, the heat preservation time is 3.2min/min, the tempering temperature is 605 ℃, and the total tempering heating time is 5.7 min/mm.
The properties of the steel plate for oceanographic engineering with 785MPa grade yield and large thickness in the embodiment are shown in Table 2.
Example 7
The thickness of the 785 MPa-yield large-thickness steel plate for ocean engineering in the embodiment is 185mm, and the chemical component compositions and the mass percentage contents of the steel plate are shown in Table 1.
The production method of the 785 MPa-yield large-thickness steel plate for ocean engineering comprises the working procedures of heating, rolling and heat treatment, and comprises the following specific process steps:
(1) a heating procedure: the furnace temperature before the steel ingot is charged is 268 ℃, the steel is braised for 4.2h after the steel ingot is charged, then the heating is started, the heating speed is 73 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the maximum heating temperature is 1205 ℃, the total heating time is 34h, and the heat preservation time is 21 h;
(2) a rolling procedure: a II-type controlled rolling process is adopted, the first stage is an austenite recrystallization stage, the rolling temperature is 1080 ℃, and the pass reduction rate is 18.5%; the second stage is an austenite non-recrystallization stage, wherein the initial rolling temperature is 873 ℃, and the final rolling temperature is 822 ℃;
(3) a heat treatment process: the quenching and tempering processes are adopted, the quenching temperature is 905 ℃, the heat preservation time is 3.7min/min, the tempering temperature is 615 ℃, and the total tempering heating time is 5.2 min/mm.
The properties of the steel plate for oceanographic engineering with 785MPa grade yield and large thickness in the embodiment are shown in Table 2.
Example 8
The thickness of the 785 MPa-yield large-thickness steel plate for ocean engineering in the embodiment is 198mm, and the chemical component composition and the mass percentage content of the steel plate are shown in Table 1.
The production method of the 785 MPa-yield large-thickness steel plate for ocean engineering comprises the working procedures of heating, rolling and heat treatment, and comprises the following specific process steps:
(1) a heating procedure: the furnace temperature before the steel ingot is charged is 275 ℃, the steel is braised for 4.8h after the steel ingot is charged, then the heating is started, the heating speed is 65 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the maximum heating temperature is 1200 ℃, the total heating time is 33h, and the heat preservation time is 24 h;
(2) a rolling procedure: a II-type controlled rolling process is adopted, the first stage is an austenite recrystallization stage, the rolling temperature is 1030 ℃, and the pass reduction rate is 16.5%; the second stage is an austenite non-recrystallization stage, wherein the initial rolling temperature is 868 ℃, and the final rolling temperature is 837 ℃;
(3) a heat treatment process: the quenching and tempering processes are adopted, the quenching temperature is 922 ℃, the heat preservation time is 3.6min/min, the tempering temperature is 630 ℃, and the total tempering heating time is 5.3 min/mm.
The properties of the steel plate for oceanographic engineering with 785MPa grade yield and large thickness in the embodiment are shown in Table 2.
Table 1 examples 1-8 yield 785MPa grade steel plate for large thickness oceanographic engineering
And mass percentage content (%)
The balance of the ingredients in table 1 is Fe and unavoidable impurities.
TABLE 2 Steel plate performance indexes for large-thickness ocean engineering of 785MPa grade yield in examples 1-8
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 (4)
1. A steel plate with 785MPa grade yield and large thickness for ocean engineering is characterized by comprising the following chemical components in percentage by mass: c: 0.07 to 0.10%, Si: 0.20 to 0.50%, Mn: 0.80-1.00%, P is less than or equal to 0.010%, S is less than or equal to 0.005%, Ni: 7.00-8.00%, Cr: 0.60-0.80%, Mo: 0.60-0.80%, V: 0.060 to 0.080%, Al: 0.020-0.050% and the balance of Fe and inevitable impurities; the thickness of the steel plate is 180-200 mm; the yield strength of the steel plate is more than or equal to 785MPa, the tensile strength is more than or equal to 870MPa, and the impact energy of the V-shaped steel plate at the transverse temperature of minus 60 ℃ is more than or equal to 70J; the steel plate is produced by the following method: comprises the working procedures of heating, rolling and heat treatment; in the heating process, the furnace temperature before the steel ingot is charged is less than or equal to 300 ℃, the steel is braised for 3-5 h after the steel ingot is charged, then the heating is started, the heating rate is 65-80 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the highest heating temperature is less than or equal to 1220 ℃, the total heating time is more than or equal to 30h, and the heat preservation time is more than or equal to 20 h; the heat treatment process adopts quenching and tempering processes, wherein the quenching temperature is 900-930 ℃, the heat preservation time is 3-4 min/min, the tempering temperature is 600-630 ℃, and the total tempering heating time is 5-6 min/mm.
2. The production method of the large-thickness steel plate with 785MPa yield for ocean engineering according to the claim 1 is characterized by comprising the working procedures of heating, rolling and heat treatment; in the heating process, the furnace temperature before the steel ingot is charged is less than or equal to 300 ℃, the steel is braised for 3-5 h after the steel ingot is charged, then the heating is started, the heating rate is 65-80 ℃/h when the temperature of the steel ingot is less than or equal to 1000 ℃, the highest heating temperature is less than or equal to 1220 ℃, the total heating time is more than or equal to 30h, and the heat preservation time is more than or equal to 20 h; the heat treatment process adopts quenching and tempering processes, wherein the quenching temperature is 900-930 ℃, the heat preservation time is 3-4 min/min, the tempering temperature is 600-630 ℃, and the total tempering heating time is 5-6 min/mm.
3. The production method of the large-thickness steel plate with yield of 785MPa for ocean engineering according to claim 2, wherein the rolling process adopts a type II controlled rolling process, the first stage is an austenite recrystallization stage, the rolling temperature is 950-1100 ℃, and the pass reduction rate is 15-20%.
4. The production method of the steel plate with yield of 785MPa grade and large thickness for ocean engineering according to claim 3, wherein the rolling process adopts a type II controlled rolling process, the second stage is an austenite non-recrystallization stage, the initial rolling temperature is 860-880 ℃, and the final rolling temperature is 820-840 ℃.
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