CN104711488A - Large-thickness high-strength steel plate for F690 ocean engineering and manufacturing method of steel plate - Google Patents
Large-thickness high-strength steel plate for F690 ocean engineering and manufacturing method of steel plate Download PDFInfo
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Abstract
The invention discloses a large-thickness high-strength steel plate for F690 ocean engineering and a manufacturing method of the steel plate. The manufacturing method comprises the procedures of smelting, casting, heating, rolling and heat treating. The steel plate comprises the following chemical ingredients by mass percentage: 0.08-0.13% of C, 0.10-0.30% of Si, 1.0-1.20% of Mn, no more than 0.010% of P, no more than 0.003% of S, 0.5-2.5% of Ni, 0.50-1.0% of Cr, 0.30-0.50% of Mo, 0.020-0.050% of Nb, 0.04-0.06% of V, 0.0005-0.0015% of B, 0.040-0.070% of TAl and the balance of Fe and inevitable impurities. In the rolling procedure, the hanging steel rolling technology is adopted; the quenching and tempering technology is adopted in the heat treating procedure. By adjusting and optimizing the ratio of alloy elements in the steel plate, the manufacturing method can ensure that the steel plate is excellent in mechanical property under the low carbon equivalent condition, so that the steel plate is excellent in structure, good in comprehensive performance and good in welding performance; by adopting the hanging steel rolling technology, the steel plate is considerably rich in low-temperature tenacity; by adopting the quenching and tempering technology in the heat treating procedure, the obtained steel plate mainly takes the martensite structure along with a few bainite complex structure, and the steel plate is uniform and fine in structure.
Description
Technical field
The present invention relates to a kind of High Strength Steel Plate and production method thereof, especially a kind of heavy thickness F690 level oceanographic engineering High Strength Steel Plate and production method thereof.
Background technology
Along with polar ice snow melt, submarine oil resources is progressively developed, require that the marine engineering equipment steel with low-temperature impact toughness is rapidly developed application, owing to being located in cold zone, add the service requirements that ocean platform is special, need to bear wave and corrode piping and druming etc., require that manufacturing offshore platform steel plate has high strength, high tenacity, heavy thickness, erosion resistance, with high content of technology, production difficulty is very big.The high tough heavy thickness ship steel of F level is the important development direction of following hull structure and offshore platform steel, is also the kind in short supply in current domestic high-end sheet material market.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high performance heavy thickness F690 level oceanographic engineering High Strength Steel Plate; Present invention also offers a kind of production method of heavy thickness F690 level oceanographic engineering High Strength Steel Plate.
For solving the problems of the technologies described above, the mass percentage of chemical composition of the present invention is: C 0.08% ~ 0.13%, Si 0.10% ~ 0.30%, Mn 1.0% ~ 1.20%, P≤0.010%, S≤0.003%, Ni 0.5% ~ 2.5%, Cr 0.50% ~ 1.0%, Mo 0.30% ~ 0.50%, Nb 0.020% ~ 0.050%, V 0.04% ~ 0.06%, B 0.0005 ~ 0.0015%, TAl 0.040% ~ 0.070%, and surplus is Fe and inevitable impurity.
Steel plate maximum ga(u)ge of the present invention is 180mm.
The effect of each composition of the present invention and content is: C: make a significant impact the surrender of steel, tensile strength, welding property, carbon can significantly improve armor plate strength by gap solid solution, but can affect welding property and the toughness of steel when carbon content is too high.Si: as reductive agent and reductor in steelmaking process, simultaneously Si can play solution strengthening effect, but content more than 0.5% time, the toughness of steel can be caused to decline, the welding property of reduction steel.Mn: can increase the toughness of steel, intensity and hardness, improves the hardening capacity of steel, improves the hot workability of steel, and cheap, can reduce the production cost of steel plate, but can weaken the resistance to corrosion of steel when Fe content is too high, reduces welding property.P and S: be all the harmful element in steel in the ordinary course of things, the fragility of steel can be increased, P makes the welding property of steel degenerate, reduce plasticity, cold-bending property is degenerated, S reduces ductility and the toughness of steel, can crackle be caused when forging and rolling, therefore should reduce the content of P and S in steel as far as possible.Cr: its content all has considerable influence to the intensity of steel plate, plasticity and low-temperature impact toughness, and this is because Cr can be solid-solution in ferrite and austenite, can form multiple carbide again with the C in steel; When Cr is solid-solution in austenite, the hardening capacity of steel can be improved, when Cr and C forms complicated carbide, and in steel during disperse educt, dispersion-strengthened action can be played, because Cr improves the effect of hardening capacity and solution strengthening, the intensity of steel under as-heat-treated condition and hardness can be improved, be thus widely used in structural low alloy steel; Also make plasticity decrease while but Cr plays strengthening effect in steel, and increase temper brittleness, therefore according to the requirement to strong plasticity, suitable Cr content can be determined.Ni: the intensity of steel plate and plasticity are all slightly improved, larger to low-temperature impact toughness increase rate, this is because Ni only forms sosoloid in steel, and solution strengthening effect is not obvious, and mainly improves material plasticity by increasing slip face when viscous deformation; Ni also can improve the hardening capacity of steel alloy, and can improve steel toughness at low temperatures, and ductile-brittle transition temperature is declined.Mo: armor plate strength, plasticity and low-temperature impact toughness are all improved a lot, this be due to Mo be solid-solution in ferrite and austenite time, the C curve of steel can be made to move to right, thus significantly improve the hardening capacity of steel; And Mo can significantly improve the recrystallization temperature of steel, improve temper resistance, compact grained sorbite can be obtained after modified, obdurability is improved; When forming the carbide of Mo, can play dispersion-strengthened action, therefore increase with Mo content, obdurability is improved.Nb: the grain refining that can promote steel rolling state microstructure, intensity and toughness can be improved simultaneously, niobium can pass through to suppress austenite recrystallization refinement microstructure effectively in During Controlled Rolling, and precipitation strength matrix, Nb can reduce superheated susceptivity and the temper brittleness of steel; In welding process, the segregation of niobium atom and separate out the alligatoring of austenite crystal when can hinder heating, and obtain more tiny heat affected zone tissue, improving welding property after ensureing welding.V: vanadium is the excellent reductor of steel; Adding vanadium in steel can thinning microstructure crystal grain, improves intensity and toughness; The carbide that vanadium and carbon are formed, can improve resistant to hydrogen corrosive power at high temperature under high pressure.Al: reductor conventional in steel, adds a small amount of Al in steel, can crystal grain thinning, improve impelling strength, Al also has oxidation-resistance and corrosion resistance, improves boron recovery rate by aluminium fixed nitrogen, and aluminium too high levels then affects the hot workability of steel, welding property and machinability.
The inventive method comprises smelting, casting, heating, rolling and heat treatment step, and described steel plate adopts the chemical composition of mentioned component scope; Described rolling process adopts the steel rolling that dries in the air; Described heat treatment step adopts quenching+tempering technique.
Rolling process described in the inventive method: adopt controlled rolling technique, I stage rolling temperature is 930 ~ 1100 DEG C, and single pass draught is 10% ~ 25%, and accumulative draft is 60% ~ 70%, and dry in the air steel thickness 100 ~ 250mm; It is 890 ~ 920 DEG C that II stage opened rolling temperature, and single pass draught is 10% ~ 27%, and accumulative draft is 30% ~ 40%, rolls rear water-cooled, leaving water temperature(LWT) 790 ~ 810 DEG C.
The quenching technology of heat treatment step described in the inventive method is: for≤100mm Plate Steel: Heating temperature 910 ± 5 DEG C, total heat-up time 2.0 ~ 2.5min/mm, roller speed 2m/min; Low-pressure stage waves time 15 ~ 20min, and red temperature of coming out of the stove is less than 100 DEG C;
For 100mm < steel plate thickness≤180mm, adopt twice circulating quenching, quenching temperature is 930 ± 5 DEG C for the first time, and second time quenching temperature is 910 ± 5 DEG C, each Quench heating time and cooling parameter are: total heat-up time 2.0 ~ 2.5min/mm, roller speed 2m/min; Low-pressure stage waves time 30min, and red temperature of coming out of the stove is less than 100 DEG C;
Tempering process is: Heating temperature 640 ± 5 DEG C, total heat-up time 4.0min/mm, air cooling after coming out of the stove.
Heating process described in the inventive method: preheating insulation 2 hours after shove charge, heat-up rate is 100 ~ 120 DEG C/h, maximum heating temperature 1220 DEG C, soaking temperature 1200 ± 10 DEG C, total heat-up time >=12min/cm, wherein soaking soaking time >=60min.The temperature of described shove charge is 700 DEG C.
To cast described in the inventive method operation: adopt continuous casting casting or die casting casting, continuous casting pouring temperature is 1530 ~ 1540 DEG C, and die casting pouring temperature is 1540 ~ 1550 DEG C.
The beneficial effect adopting technique scheme to produce is: the present invention has formulated rational chemical composition ranges, by carbon, manganese solution strengthening; Add a small amount of Nb, V crystal grain thinning, its carbonitride plays dispersion-strengthened action; Add the alloying elements such as appropriate Cr, Ni, Mo, improve steel plate hardening capacity and low-temperature impact toughness, there is good mechanical property.
The inventive method, by the proportioning of adjusting and optimizing steel plate interalloy element, can be guaranteed under low-carbon-equivalent condition that mechanical property of steel plate is good, make steel plate have good tissue, over-all properties and welding property.The inventive method adopts and to dry in the air steel rolling technique, solve mill milling insufficient pressure and the coarse grains that causes uneven, have excellent over-all properties; Low-temperature flexibility has sizable affluence amount, can be widely used in marine drilling platform engineering, ocean wind power engineering etc., have a extensive future.The inventive method adopts the thermal treatment process of quenching+tempering, obtains steel plate tissue based on martensite, and contains the complex tissue of a small amount of bainite, steel plate homogeneous microstructure, tiny.
Steel of the present invention is purer, P≤0.010%, S≤0.003%; Low-temperature impact work is high, thickness of slab 1/4-60 DEG C, place more than transverse impact merit 120J; Armor plate strength is high, thickness of slab 1/4th more than cross directional stretch 830MPa; Plate Welding evaluation experiment shows that welding property is good; Test-results shows: the steel plate adopting method of the present invention to produce has that purity is higher, the feature of-60 DEG C of ballistic works and intensity and good welding performance.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
Embodiment 1: this heavy thickness F690 level oceanographic engineering High Strength Steel Plate adopts following compositions proportioning and production technique.
This High Strength Steel Plate thickness is 50mm, Ingredients Weight proportioning is: C 0.08%, Si 0.25%, Mn 1.18%, P 0.008%, S 0.002%, Ni 0.50%, Cr 0.52%, Mo 0.30%, Nb 0.025%, V 0.045%, the full aluminium of B 0.0010, TAl() 0.055%, surplus is Fe and inevitable impurity.
The production stage of this High Strength Steel Plate is as follows: (1) smelting procedure: molten steel first through electrosmelting, then sends into the refining of LF refining furnace, and liquid steel temperature reaches 1580 DEG C and proceeds to VD stove Fruit storage; Vacuum tightness is 66.6Pa, 20 minutes vacuum hold-times, adds non-metallic inclusion, harmful element in CaSi block discharge molten steel, ensure the pure of molten steel before vacuum.
(2) casting operation: cast by the continuous casting of molten steel after smelting, pouring temperature is 1532 DEG C, obtains continuously cast bloom.
(3) heating process: continuously cast bloom carries out heat treated, preheating insulation 2 hours after 700 DEG C of shove charges, heat-up rate is 100 DEG C/h, maximum heating temperature 1220 DEG C, soaking temperature 1200 DEG C, total heat-up time 12min/cm(thickness of strand), wherein soaking soaking time 60min.
(4) rolling process: adopt TMCP type rolling technology (ThermoMechanicalControlProcess: thermomechanical Controlling Technology), I stage rolling temperature is 1100 DEG C, single pass draught is 10% ~ 25%, and accumulative draft is 60% ~ 70%, and dry in the air steel thickness 100mm; II stage rolling temperature is 910 DEG C, and single pass draught is 10% ~ 27%, and accumulative draft is 30% ~ 40%, finishing temperature 830 DEG C, waters the cooling of the little water yield, leaving water temperature(LWT) 800 DEG C after rolling.
(5) heat treatment step: at roller hearth furnace, modifier treatment is carried out to gained steel plate, quenching technology: Heating temperature 910 ± 5 DEG C, heat-up time 2.5min/mm(steel plate thickness), high pressure section maximum amount of water 4480m
3/ h, roller speed 2m/min; Low-pressure stage waves time 15min, red temperature 30 DEG C of coming out of the stove.Adopt the tempering of roller bottom type tempering stove, tempering process: Heating temperature 640 DEG C, heat-up time 4.0min/mm, air cooling after coming out of the stove; Described High Strength Steel Plate can be obtained.
The mechanical property of this High Strength Steel Plate: yield strength 765MPa, tensile strength 855MPa, unit elongation is 20%, and 145J is impacted in-60 DEG C, thickness 1/4 position, and the obdurability coupling of this steel plate is good.
Embodiment 2: this High Strength Steel Plate adopts following compositions proportioning and production technique.
This High Strength Steel Plate thickness is 100mm, Ingredients Weight proportioning is: C 0.11%, Si 0.25%, Mn 1.11%, P 0.007%, S 0.001%, Ni 1.48%, Cr 0.95%, Mo 0.43%, Nb 0.027%, V 0.051%, B 0.0005%, TAl 0.047%, and surplus is Fe and inevitable impurity.
The production stage of this High Strength Steel Plate is as follows: (1) smelting procedure: molten steel first through electrosmelting, then sends into the refining of LF refining furnace, and liquid steel temperature reaches 1585 DEG C and proceeds to VD stove Fruit storage; Vacuum tightness is 66.6Pa, 25 minutes vacuum hold-times, adds non-metallic inclusion, harmful element in CaSi block discharge molten steel, ensure the pure of molten steel before vacuum.
(2) casting operation: cast by the continuous casting of molten steel after smelting, pouring temperature is 1540 DEG C, obtains continuously cast bloom.
(3) heating process: continuously cast bloom carries out heat treated, preheating insulation 2 hours after 700 DEG C of shove charges, heat-up rate 110 DEG C/h, maximum heating temperature 1220 DEG C, soaking temperature 1210 DEG C, total heat-up time 13min/cm, wherein soaking soaking time 80min.
(4) rolling process: adopt TMCP type rolling technology, I stage rolling temperature is 1050 DEG C, and single pass draught is 10% ~ 25%, and accumulative draft is 60% ~ 70%, and dry in the air steel thickness 180mm; II stage rolling temperature is 890 DEG C, and single pass draught is 10% ~ 15%, and accumulative draft is 30% ~ 40%, finishing temperature 818 DEG C, waters the cooling of the little water yield, leaving water temperature(LWT) 790 DEG C after rolling.
(5) heat treatment step: at roller hearth furnace, modifier treatment is carried out to gained steel plate, quenching technology, Heating temperature 910 ± 5 DEG C, heat-up time 2.2min/mm, high pressure section maximum amount of water (4430m
3/ h), roller speed 2m/min, low-pressure stage waves 20min, red temperature 38 DEG C of coming out of the stove.Tempering process, Heating temperature 645 DEG C, heat-up time 4.0min/mm, air cooling after coming out of the stove; Described High Strength Steel Plate can be obtained.
The mechanical property of this High Strength Steel Plate: yield strength 725MPa, tensile strength 830MPa, 130J is impacted in 1/4-60 DEG C, position, and unit elongation is 19%, and this steel plate obdurability coupling is good.
Embodiment 3: this High Strength Steel Plate adopts following compositions proportioning and production technique.
This High Strength Steel Plate thickness is 180mm, Ingredients Weight proportioning is: C 0.13%, Si 0.30%, Mn 1.06%, P 0.007%, S 0.001%, Ni 2.50%, Cr 0.54%, Mo 0.50%, Nb 0.037%, V 0.051%, B 0.0012%, TAl 0.047%, and surplus is Fe and inevitable impurity.
The production stage of this High Strength Steel Plate is as follows: (1) smelting procedure: molten steel first through electrosmelting, then sends into the refining of LF refining furnace, and liquid steel temperature reaches 1579 DEG C and proceeds to VD stove Fruit storage; Vacuum tightness is 66.6Pa, 25 minutes vacuum hold-times, adds non-metallic inclusion, harmful element in CaSi block discharge molten steel, ensure the pure of molten steel before vacuum.
(2) casting operation: the molten steel die casting after smelting cast, pouring temperature is 1544 DEG C, obtains steel ingot.
(3) heating process: heating process: continuously cast bloom carries out heat treated, preheating insulation 2 hours after 700 DEG C of shove charges, heat-up rate is 105 DEG C/h, maximum heating temperature 1220 DEG C, soaking temperature 1205 DEG C, total heat-up time 13.5min/cm, wherein soaking soaking time 10h(> 100mm steel plate adopts Rolling from Ingot to make material, and soaking soaking time is long).
(4) rolling process: adopt TMCP type rolling technology, I stage rolling temperature is 1050 DEG C, and single pass draught is 10% ~ 25%, and accumulative draft is 70%, and dry in the air steel thickness 240mm; II stage rolling temperature is 900 DEG C, and single pass draught is 10% ~ 15%, and accumulative draft is 33%, finishing temperature 824 DEG C, waters the cooling of the little water yield, leaving water temperature(LWT) 810 DEG C after rolling.
(5) heat treatment step: at roller hearth furnace, modifier treatment is carried out to gained steel plate, quenching technology, for the first time quenching technology: Heating temperature 930 ± 5 DEG C, high pressure section maximum amount of water (4430m
3/ h), second time quenching technology: Heating temperature 910 ± 5 DEG C, high pressure section maximum amount of water (4430m
3/ h); Total heat-up time 2.0min/mm, roller speed 2m/min, low-pressure stage waves 30min; To come out of the stove red temperature 50 DEG C.Tempering process, Heating temperature 640 DEG C, heat-up time 4.0min/mm, air cooling after coming out of the stove; Described High Strength Steel Plate can be obtained.
The mechanical property of this High Strength Steel Plate: yield strength 715MPa, tensile strength 835MPa, 122J is impacted in 1/4-60 DEG C, position, and unit elongation is 18%, and the low-temperature impact-resistant toughness of this steel plate and hardness etc. are functional.
Embodiment 4: this High Strength Steel Plate adopts following compositions proportioning and production technique.
This High Strength Steel Plate thickness is 150mm, Ingredients Weight proportioning is: C 0.12%, Si 0.16%, Mn 1.20%, P 0.005%, S 0.003%, Ni 2.05%, Cr 1.0%, Mo 0.38%, Nb 0.020%, V 0.04%, B 0.0012%, TAl 0.040%, and surplus is Fe and inevitable impurity.
The production stage of this High Strength Steel Plate is as follows: (1) smelting procedure is with embodiment 1.
(2) casting operation: cast by the continuous casting of molten steel after smelting, pouring temperature is 1530 DEG C, obtains steel ingot.
(3) heating process: continuously cast bloom carries out heat treated, preheating insulation 2 hours after 700 DEG C of shove charges, heat-up rate is 120 DEG C/h, maximum heating temperature 1220 DEG C, soaking temperature 1190 DEG C, total heat-up time 13.5min/cm(ingot thickness), wherein soaking soaking time 10.5h.
(4) rolling process: adopt TMCP type rolling technology, I stage rolling temperature is 930 DEG C, and single pass draught is 10% ~ 15%, and accumulative draft is 60%, and dry in the air steel thickness 220mm; II stage rolling temperature is 920 DEG C, and single pass draught is 20% ~ 27%, and accumulative draft is 40%, finishing temperature 824 DEG C, waters the cooling of the little water yield, leaving water temperature(LWT) 805 DEG C after rolling.
(5) heat treatment step: at roller hearth furnace, modifier treatment is carried out to gained steel plate, quenching technology, for the first time quenching technology: Heating temperature 930 ± 5 DEG C; Second time quenching technology: Heating temperature 910 ± 5 DEG C; Total heat-up time 2.5min/mm, roller speed 2m/min, low-pressure stage waves 30min; To come out of the stove red temperature 37 DEG C.Tempering process, Heating temperature 635 DEG C, heat-up time 4.0min/mm, air cooling after coming out of the stove; Described High Strength Steel Plate can be obtained.
The mechanical property of this High Strength Steel Plate: yield strength 725MPa, tensile strength 840MPa, 150J is impacted in 1/4-60 DEG C, position, and unit elongation is 19%, and the low-temperature impact-resistant toughness of this steel plate and hardness etc. are functional.
Embodiment 5: this High Strength Steel Plate adopts following compositions proportioning and production technique.
This High Strength Steel Plate thickness is 160mm, Ingredients Weight proportioning is: C 0.10%, Si 0.10%, Mn 1.10%, P 0.010%, S 0.002%, Ni 2.2%, Cr 0.72%, Mo 0.40%, Nb 0.041%, V 0.06%, B 0.0013%, TAl 0.070%, and surplus is Fe and inevitable impurity.
The production stage of this High Strength Steel Plate is as follows: (1) smelting procedure is with embodiment 2.
(2) casting operation: the molten steel die casting after smelting cast, pouring temperature is 1550 DEG C, obtains steel ingot.
(3) heating process: die casting base carries out heat treated, concrete technology is with embodiment 2.
(4) rolling process: adopt TMCP type rolling technology, concrete technology is with embodiment 2.
(5) heat treatment step: at roller hearth furnace, modifier treatment is carried out to gained steel plate, quenching technology, for the first time quenching technology: Heating temperature 930 ± 5 DEG C; Second time quenching technology: Heating temperature 910 ± 5 DEG C; Total heat-up time 2.2min/mm, roller speed 2m/min, low-pressure stage waves 30min; To come out of the stove red temperature 92 DEG C.Tempering process, Heating temperature 640 DEG C, heat-up time 4.0min/mm, air cooling after coming out of the stove; Described High Strength Steel Plate can be obtained.
The mechanical property of this High Strength Steel Plate: yield strength 740MPa, tensile strength 850MPa, 141J is impacted in 1/4-60 DEG C, position, and unit elongation is 21%, and the low-temperature impact-resistant toughness of this steel plate and hardness etc. are functional.
Embodiment 6: this High Strength Steel Plate adopts following compositions proportioning and production technique.
This High Strength Steel Plate thickness is 80mm, Ingredients Weight proportioning is: C 0.09%, Si 0.20%, Mn 1.0%, P 0.007%, S 0.002%, Ni 1.1%, Cr 0.5%, Mo 0.46%, Nb 0.05%, V 0.054%, B 0.0015%, TAl 0.062%, and surplus is Fe and inevitable impurity.
The production stage of this High Strength Steel Plate is as follows: (1) smelting procedure is with embodiment 2.
(2) casting operation: the molten steel die casting after smelting cast, pouring temperature is 1540 DEG C, obtains steel ingot.
(3) heating process, (4) rolling process and (5) heat treatment step are all with embodiment 2.
The mechanical property of this High Strength Steel Plate: yield strength 780MPa, tensile strength 865MPa, 172J is impacted in 1/4-60 DEG C, position, and unit elongation is 22%, and the low-temperature impact-resistant toughness of this steel plate and hardness etc. are functional.
Claims (8)
1. a heavy thickness F690 level oceanographic engineering High Strength Steel Plate, it is characterized in that, the mass percentage of its chemical composition is: C 0.08% ~ 0.13%, Si 0.10% ~ 0.30%, Mn 1.0% ~ 1.20%, P≤0.010%, S≤0.003%, Ni 0.5% ~ 2.5%, Cr 0.50% ~ 1.0%, Mo 0.30% ~ 0.50%, Nb 0.020% ~ 0.050%, V 0.04% ~ 0.06%, B 0.0005 ~ 0.0015%, TAl 0.040% ~ 0.070%, and surplus is Fe and inevitable impurity.
2. heavy thickness F690 level oceanographic engineering High Strength Steel Plate according to claim 1, is characterized in that: described steel plate maximum ga(u)ge is 180mm.
3. the production method of a heavy thickness F690 level oceanographic engineering High Strength Steel Plate, it comprises smelting, casting, heating, rolling and heat treatment step, it is characterized in that, the mass percentage of described steel plate chemical composition is: C 0.08% ~ 0.13%, Si 0.10% ~ 0.30%, Mn 1.0% ~ 1.20%, P≤0.010%, S≤0.003%, Ni 0.5% ~ 2.5%, Cr 0.50% ~ 1.0%, Mo 0.30% ~ 0.50%, Nb 0.020% ~ 0.050%, V 0.04% ~ 0.06%, B 0.0005 ~ 0.0015%, TAl 0.040% ~ 0.070%, surplus is Fe and inevitable impurity,
Described rolling process adopts the steel rolling that dries in the air; Described heat treatment step adopts quenching+tempering technique.
4. the production method of heavy thickness F690 level oceanographic engineering High Strength Steel Plate according to claim 3, it is characterized in that, described rolling process: adopt controlled rolling technique, I stage rolling temperature is 930 ~ 1100 DEG C, single pass draught is 10% ~ 25%, accumulative draft is 60% ~ 70%, and dry in the air steel thickness 100 ~ 250mm; It is 890 ~ 920 DEG C that II stage opened rolling temperature, and single pass draught is 10% ~ 27%, and accumulative draft is 30% ~ 40%, rolls rear water-cooled, leaving water temperature(LWT) 790 ~ 810 DEG C.
5. the production method of heavy thickness F690 level oceanographic engineering High Strength Steel Plate according to claim 3, it is characterized in that, the quenching technology of described heat treatment step is: for≤100mm Plate Steel: Heating temperature 910 ± 5 DEG C, total heat-up time 2.0 ~ 2.5min/mm, roller speed 2m/min; Low-pressure stage waves time 15 ~ 20min, and red temperature of coming out of the stove is less than 100 DEG C;
For 100mm < steel plate≤180mm, adopt twice circulating quenching, quenching temperature is 930 ± 5 DEG C for the first time, and second time quenching temperature is 910 ± 5 DEG C, each Quench heating time and cooling parameter are: total heat-up time 2.0 ~ 2.5min/mm, roller speed 2m/min; Low-pressure stage waves time 30min, and red temperature of coming out of the stove is less than 100 DEG C;
Tempering process is: Heating temperature 640 ± 5 DEG C, total heat-up time 4.0min/mm, air cooling after coming out of the stove.
6. the production method of heavy thickness F690 level oceanographic engineering High Strength Steel Plate according to claim 3, it is characterized in that, described heating process: preheating insulation 2 hours after shove charge, heat-up rate is 100 ~ 120 DEG C/h, maximum heating temperature 1220 DEG C, soaking temperature 1200 ± 10 DEG C, total heat-up time >=12min/cm, wherein soaking soaking time >=60min.
7. the production method of heavy thickness F690 level oceanographic engineering High Strength Steel Plate according to claim 6, is characterized in that: the temperature of described shove charge is 700 DEG C.
8. the production method of the heavy thickness F690 level oceanographic engineering High Strength Steel Plate according to claim 3-7 any one, it is characterized in that, described casting operation: adopt continuous casting casting or die casting casting, continuous casting pouring temperature is 1530 ~ 1540 DEG C, and die casting pouring temperature is 1540 ~ 1550 DEG C.
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