CN104726769A - Maximum-thickness S355G10+N steel plate for ocean platform and production method of steel plate - Google Patents
Maximum-thickness S355G10+N steel plate for ocean platform and production method of steel plate Download PDFInfo
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Abstract
The invention discloses a maximum-thickness S355G10+N steel plate for an ocean platform and a production method of the maximum-thickness S355G10+N steel plate. The production method of the maximum-thickness S355G10+N steel plate comprises smelting, casting, heating, rolling, cooling and heat treatment processes. The maximum-thickness S355G10+N steel plate comprises the following chemical ingredients in percentage by weight: 0.08-0.12% of C, 0.15-0.50% of Si, 1.40-1.65% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.040-0.060% of V, 0.020-0.030% of Nb, 0.020-0.050% of Al, less than or equal to 0.43% of Cea, less than or equal to 0.22% of Pcm and the balance of Fe and inevitable impurities. The maximum-thickness S355G10+N steel plate has the advantages that low-carbon and high-microalloying design thought is adopted in composition design, the problem of segregation of carbon and manganese is solved, and the requirements such as high strength, high impact toughness and wide cold bending performance are met; hardenability of the maximum-thickness S355G10+N steel plate is guaranteed under the low-carbon and low-equivalent carbon content conditions, and the maximum-thickness S355G10+N steel plate has good structure and overall performance and welding performance; and the maximum-thickness S355G10+N steel plate has good mechanical properties, welding performance and processability and can meet requirements of construction technological conditions of an ocean engineering equipment manufacturing plant.
Description
Technical field
The present invention relates to a kind of oceanographic engineering structural steel and iron, especially a kind of heavy thickness ocean platform S355G10+N steel plate and production method thereof.
Background technology
At China's sea petrol resources exploitation, marine engineering equipment production is for ocean exploitation provides the strategic industry of equipment.Expecting the year two thousand twenty global ocean engineer equipment market investment will more than 1,200 hundred million yuan, and wherein platform and ocean engineering ship investment about 70,000,000,000 yuan, deep water equipment investment accounts for more than 45%.Current international ocean Platform Steel Major grades is 355,420,460MPa, and China there is no special offshore platform steel standard, adopts foreign standard.Below EH36 Platform Steel realizes production domesticization substantially, accounts for 90% of Platform Steel amount, but key position heavy thickness used, High Strength Steel still dependence on import.
EN10225 EU criteria, defines the chemical composition of offshore platform structure steel, mechanical property, welding property, non-destructive test(ing)(NDT) etc.The performance of steel plate for ocean engineering to steel has more special requirement, and slab application quantity is large, and to thickness effect, Z-direction performance, antifatigue and fracture property, low-temperature impact resistance etc., all there are strict requirements.The domestic steel mill being suitable for all kinds of offshore platform steel needed for national oilfield exploitation that can produce at present is also few, technically adopts the technique such as low-carbon-equivalent, microalloying, high cleanliness, Ca process, controlled rolling.
Along with the development of China's ocean exploitation, constantly expand the demand of offshore platform steel, current Weight of steel is at 3,000,000 more than t.But large wall thickness deep-sea, the seabed pipe line steel etc. of the Z-direction steel of key position superstrength used, heavy thickness steel plate, anti-lamellar tearing and deep-sea gas engineering, domestic only have indivedual steel mill to produce, as Wugang company.Most steel mill is also in research and development advanced development, most dependence on import.Current ocean platform Weight of steel is more than 3,000,000 tons.Along with the development of China's ocean exploitation, also will constantly expand the demand of offshore platform steel.Offshore platform steel is by the product being the domestic steel enterprise emphasis research and development coming years and produce.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high performance heavy thickness ocean platform S355G10+N steel plate; Present invention also offers a kind of production method of heavy thickness ocean platform S355G10+N steel plate.
For solving the problems of the technologies described above, the weight percent of steel plate chemical composition of the present invention is: C 0.08 ~ 0.12%, Si 0.15 ~ 0.50%, Mn 1.40 ~ 1.65%, P≤0.015%, S≤0.005%, V 0.040 ~ 0.060%, Nb 0.020 ~ 0.030%, Al 0.020 ~ 0.050%, Ceq≤0.43%, Pcm≤0.22%, all the other are Fe and inevitable impurity.
Steel plate thickness of the present invention is 100mm ~ 150mm.
The inventive method comprises smelting, casting, heating, rolling, cooling and heat treatment step; The weight percent of described steel plate chemical composition is described above.
Heating process described in the inventive method: steel ingot heats in process furnace, less than 1000 DEG C heat-up rate≤120 DEG C/h, maximum heating temperature≤1240 DEG C; After coming out of the stove, Rolling from Ingot is made steel billet; Steel billet enters process furnace heating again, and heating coefficient >=10min/cm, maximum heating temperature≤1240 DEG C, soaking zone soaking time is greater than 90min.
Heat treatment step described in the inventive method: Heating temperature 920 DEG C ± 10 DEG C, total heat-up time is 2.0 ~ 2.4min/mm.
To cast described in the inventive method operation: adopt ingot mould cast, superheating temperature controls at 20 DEG C ~ 50 DEG C.
Rolling process described in the inventive method: adopt II type controlled rolling process, first stage rolling is between 950 ~ 1100 DEG C, and this stage reduction in pass is 25 ~ 35%, accumulative draft >=70%; Start rolling temperature≤900 DEG C of subordinate phase, finishing temperature≤820 DEG C, accumulative draft >=30%.
Refrigerating work procedure described in the inventive method: the steel plate after rolling enters ACC and cools fast, red temperature 650 DEG C ~ 700 DEG C; Then carry out stacking slow cooling, 48 hours stacking time and more than.
The beneficial effect adopting technique scheme to produce is: the present invention takes the mentality of designing of low-carbon (LC), high microalloying on Composition Design, solves carbon, manganese segregation problems and high strength, the requirement of high impact toughness and wide cold-bending property; Under the condition of low-carbon (LC), low-carbon-equivalent, guarantee steel plate hardening capacity, there is good tissue, over-all properties and welding property.Mechanical property of the present invention, welding property, processing characteristics are good, can meet the requirement of marine engineering equipment manufacturing works construction technology condition.
The inventive method adopts the mode of production that secondary is become a useful person that steel surface can be made bright and clean, does not have dirt, wrinkle, phosphorus skin and rust staining; The requirement that steel plate does not allow soldering can also be reached, control plate shape and surface quality well.
The inventive method, by reasonable heat treating regime, obtains ferrite and pearlite tissue; Surface of steel plate bainite layer is few, and grain fineness number more than 8 grades, inclusion grade is at about 0.5 grade.
The inventive method product has the following advantages: good mechanical performance, and yield strength and tensile strength comparatively Thin Specs performance index have larger surplus capacity; Low-temperature impact work is high, and more than-40 DEG C of ballistic work 150 Jiao, timeliness impacts more than 120J; Z-direction performance (relative reduction in area %) is more than 50; Carbon equivalent is 0.39 ~ 0.41, and welding sensitivity coefficient is 0.19 ~ 0.21; Steel plate maximum ga(u)ge can reach 150mm.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the macrograph at the embodiment of the present invention 1 steel plate 1/4 place;
Fig. 2 is the macrograph at the embodiment of the present invention 1 steel plate 1/2 place.
Embodiment
This heavy thickness ocean platform S355G10+N steel plate adopts following compositions proportioning and production method:
The weight percent of this steel plate chemical composition is: C 0.08 ~ 0.12%, Si 0.15 ~ 0.50%, Mn 1.40 ~ 1.65%, P≤0.015%, S≤0.005%, V 0.040 ~ 0.060%, Nb 0.020 ~ 0.030%, Al 0.020 ~ 0.050%, Ceq≤0.43%, Pcm≤0.22%, all the other are Fe and inevitable impurity.Steel plate thickness is 100 ~ 150mm.
(1) casting operation: after vacuum breaking, adopt the ingot mould of corresponding ingot shape to pour into a mould, ensure that heavy thickness, greatly substance steel plate have enough draught and raw material of becoming a useful person, superheating temperature controls at 20 DEG C ~ 50 DEG C.
(2) Heating Steel Ingots operation: steel ingot is become a useful person needs secondary to become a useful person rolling, steel ingot band temperature cleaning (>=150 DEG C), guarantees that cleaning puts in place, ensures to roll rear plate quality.
Perform II group steel heating cycle, maximum heating temperature≤1240 DEG C, ensure that ingot blank burns evenly thoroughly; Steel ingot less than 1000 DEG C heat-up rate≤120 DEG C/h, >=1000 DEG C of heat-up rates are not limit.
Heating hangs tooth with little during tapping after coming out of the stove, and the tapping of folder cap mouth, stops heavily side weld and mend; Plate surface quality requires strict, and steel ingot is strengthened dephosphorize by high pressure water and guaranteed to eliminate iron sheet after coming out of the stove, and ensures that surface quality is good.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling; Heating coefficient >=the 10min/cm of its steel billet, maximum heating temperature≤1240 DEG C, soaking zone soaking time is greater than 90min.
(3) rolling process: adopt II type controlled rolling process, first stage first stage is the austenite recrystallization stage, and rolling temperature is 950 ~ 1100 DEG C, this stage reduction in pass is 25 ~ 35%, accumulative draft >=70%, makes austenite generation perfect recrystallization, with fining austenite grains; Subordinate phase is the austenite non-recrystallize stage, start rolling temperature≤900 DEG C, finishing temperature≤820 DEG C, in this one-phase, austenite crystal is elongated, in elongation non-recrystallization austenite in form high-density mechanical twin and deformed belt, simultaneously microalloy carbon, nitride are because of deformation-induced precipitation, thus add ferritic nucleation site, refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative draft >=30%.
In the operation of rolling, high temperature section adopts low speed large soft reduction process rolling, improves internal soundness, suitably increases high temperature section and to fetch water number of times, reduce iron scale press-in, guarantee that surface of steel plate is bright and clean without iron sheet.
(4) refrigerating work procedure: roll rear steel plate and enter ACC quickly cooling device and carry out on-line cooling, red temperature 650 DEG C ~ 700 DEG C; Roll rear timely stacking slow cooling, stacking temperature 580 DEG C, stacking requires that steel plate head or shoulder align as far as possible; More than 48 hours stacking time, the time of reaching can de-stacking, turnover panel, reconditioning; Do not allow flaw detection during de-stacking steel temperature >=100 DEG C, forbid more than 100 DEG C coolings of fetching water.
(5) heat treatment step: the mechanical property good in order to ensure steel plate and surface quality is frosting in heat treatment process light plate upper and lower surface, pays close attention to steel plate following table shot-blasting quality, if shot-blasting quality does not conform to, carry out secondary ball blast.Overhead traveling crane leans on plate turnover root when hanging steel as far as possible, prevents surface tear.Heat treatment furnace is adopted to carry out normalizing treatment to steel plate, normalizing process: Heating temperature 920 DEG C ± 10 DEG C, total heat-up time: 2.0 ~ 2.4min/mm.
Embodiment 1: this heavy thickness ocean platform S355G10+N steel plate adopts following compositions proportioning and production method.
This S355G10+N steel plate thickness is 150mm, component content (wt) is: C 0.12%, Si 0.15%, Mn 1.63%, P 0.006%, S 0.001%, V 0.044%, Nb 0.028 %, Al 0.047%, Ceq 0.40%, Pcm 0.19%, all the other are Fe and inevitable impurity.
The production method of this steel plate is as follows: (1) casting operation: after protecting vacuum breaking, temperature is at 1548 DEG C, and then adopt 33.4T slab ingot mould to cast, superheating temperature controls at 40 DEG C.
(2) heating process: heating process is: by II group of steel heating cycle, maximum heating temperature 1239 DEG C, steel ingot less than 1000 DEG C heat-up rates 117 DEG C/h, >=1000 DEG C of heat-up rates are not limit.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling; The heating coefficient 10min/cm of its steel billet, maximum heating temperature 1233 DEG C, soaking zone soaking time 120min.
(3) rolling process: adopt II type controlled rolling process, first stage rolling is at 1040 DEG C, and this stage reduction in pass is 25 ~ 30%, accumulative draft 81%; Subordinate phase start rolling temperature is 880 DEG C, and finishing temperature is 810 DEG C, accumulative draft 65%.
(4) water-cooled operation: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, red temperature is 680 DEG C; Roll rear timely stacking slow cooling, stacking temperature 580 DEG C, 65 hours stacking time.Do not allow flaw detection during de-stacking steel temperature >=100 DEG C, forbid more than 100 DEG C coolings of fetching water.
(5) heat treatment step: Heating temperature 920 DEG C, total heat-up time: 2.2min/mm.
This S355G10+N steel plate rolls into the macrograph of 150mm steel plate as shown in Figure 1 and Figure 2, and steel plate homogeneous microstructure is tiny, and organize grain fineness number at 9.0 grades, organization type is: ferrite+perlite, and a small amount of bainite, banded structure grade 0.5 grade.Mechanical property is: yield strength 390MPa, tensile strength 575MPa, yield tensile ratio=0.68, δ 5=29%;-40 DEG C of ballistic work AKV(laterally, thickness of slab 1/2 place): 173,156,186J;-40 DEG C of timeliness ballistic work AKV(laterally, thickness of slab 1/2 place): 123,146,166J; Z-direction: 55,58,56%.
Embodiment 2: this S355G10+N steel plate adopts following compositions proportioning and production method.
This S355G10+N steel plate thickness is 130mm, component content is (wt): C 0.08%, Si 0.48%, Mn 1.40%, P 0.014%, S 0.004%, V 0.060%, Nb 0.022%, Al 0.020%, Ceq 0.40%, Pcm 0.19%, all the other are Fe and inevitable impurity.
The production method of this steel plate is as follows: (1) casting process: after protecting vacuum breaking, temperature is at 1546 DEG C, and then adopt 31.4T slab ingot mould to cast, superheating temperature controls at 30 DEG C.
(2) heating process: by II group of steel heating cycle, maximum heating temperature 1231 DEG C, ensures that ingot blank is grilled thoroughly evenly; Steel ingot less than 1000 DEG C heat-up rates 109 DEG C/h, >=1000 DEG C of heat-up rates are not limit.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling; The heating coefficient 12min/cm of its steel billet, maximum heating temperature 1233 DEG C, soaking zone soaking time 95min.
(3) rolling technology: adopt II type controlled rolling process, first stage rolling is at 980 DEG C, and reduction in pass is 30 ~ 35%, accumulative draft 88%; Subordinate phase start rolling temperature is 900 DEG C, and finishing temperature is 790 DEG C, accumulative draft 62%.
(4) water-cooling process: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, red temperature is 690 DEG C; Roll rear timely stacking slow cooling, stacking temperature 580 DEG C, 70 hours stacking time.
(5) thermal treatment process: Heating temperature 910 DEG C, total heat-up time: 2.2min/mm.
This S355G10+N steel plate rolls into 130mm steel plate, and steel plate homogeneous microstructure is tiny, and organize grain fineness number at 9.5 grades, organization type is: ferrite+perlite, and a small amount of bainite, banded structure grade 1.0 grades.Mechanical property is: yield strength 402MPa, tensile strength 585MPa, yield tensile ratio=0.69, δ 5=31%;-40 DEG C of ballistic work AKV(laterally, thickness of slab 1/2 place): 193,176,156J;-40 DEG C of timeliness ballistic work AKV(laterally, thickness of slab 1/2 place): 143,136,166J; Z-direction: 52,54,51%.
Embodiment 3: this S355G10+N steel plate adopts following compositions proportioning and production method.
This S355G10+N steel plate thickness is 110mm, component content (wt) is: C 0.10%, Si 0.35%, Mn 1.55%, P 0.010%, S 0.003%, V 0.045%, Nb 0.030%, Al 0.033%, Ceq 0.40%, Pcm 0.19%, all the other are Fe and inevitable impurity.
The production method of this steel plate is as follows: (1) casting process: after protecting vacuum breaking, temperature is at 1540 DEG C, then adopts 28T slab ingot mould to cast, protects superheating temperature and control at 20 DEG C.
(2) heating process: by II group of steel heating cycle, maximum heating temperature 1238 DEG C, steel ingot less than 1000 DEG C heat-up rates 112 DEG C/h, >=1000 DEG C of heat-up rates are not limit.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling; The heating coefficient 20min/cm of its steel billet, maximum heating temperature 1223 DEG C, soaking zone soaking time 120min.
(3) rolling technology: adopt II type controlled rolling process, first stage rolling is at 1050 DEG C, and reduction in pass is 26 ~ 28%, accumulative draft 75%; Subordinate phase start rolling temperature is 880 DEG C, and finishing temperature is 810 DEG C, accumulative draft 70%.
(4) water-cooling process: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, red temperature is 670 DEG C; Roll rear timely stacking slow cooling, stacking temperature 580 DEG C, 90 hours stacking time.
(5) thermal treatment process: Heating temperature 920 DEG C, total heat-up time: 2.2min/mm.
This S355G10+N steel plate rolls into 110mm steel plate, and steel plate homogeneous microstructure is tiny, and organize grain fineness number at 10.5 grades, organization type is: ferrite+perlite, and a small amount of bainite, banded structure grade 0 grade.Mechanical property is: yield strength 412MPa, tensile strength 590MPa, yield tensile ratio=0.70, δ 5=33%;-40 DEG C of ballistic work AKV(laterally, thickness of slab 1/2 place): 213,226,206J;-40 DEG C of timeliness ballistic work AKV(laterally, thickness of slab 1/2 place): 143,136,166J; Z-direction: 57,54,56%.
Embodiment 4: this S355G10+N steel plate adopts following compositions proportioning and production method.
This S355G10+N steel plate thickness is 100mm, component content (wt) is: C 0.09%, Si 0.50%, Mn 1.47%, P 0.014%, S 0.002%, V 0.040%, Nb 0.025%, Al 0.050%, Ceq 0.38%, Pcm 0.22%, all the other are Fe and inevitable impurity.
The production method of this steel plate is as follows: (1) casting process: adopt 28T slab ingot mould to cast, protect superheating temperature and control at 50 DEG C.
(2) heating process: by II group of steel heating cycle, maximum heating temperature 1240 DEG C, steel ingot less than 1000 DEG C heat-up rates 118 DEG C/h, >=1000 DEG C of heat-up rates are not limit.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling; The heating coefficient 15min/cm of its steel billet, maximum heating temperature 1240 DEG C, soaking zone soaking time 110min.
(3) rolling technology: adopt II type controlled rolling process, first stage rolling is at 1100 DEG C, and reduction in pass is 28 ~ 32%, accumulative draft 70%; Subordinate phase start rolling temperature is 870 DEG C, and finishing temperature is 820 DEG C, accumulative draft 80%.
(4) water-cooling process: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, red temperature is 650 DEG C; Roll rear timely stacking slow cooling, 48 hours stacking time.
(5) thermal treatment process: Heating temperature 930 DEG C, total heat-up time: 2.0min/mm.
This S355G10+N steel plate rolls into 100mm steel plate, and steel plate homogeneous microstructure is tiny, and organize grain fineness number at 10 grades, organization type is: ferrite+perlite, and a small amount of bainite, banded structure grade 0 grade.Mechanical property is: yield strength 402MPa, tensile strength 585MPa, yield tensile ratio=0.69, δ 5=31%;-40 DEG C of ballistic work AKV(laterally, thickness of slab 1/2 place): 203,216,208J;-40 DEG C of timeliness ballistic work AKV(laterally, thickness of slab 1/2 place): 153,130,146J; Z-direction: 55,56,53%.
Embodiment 5: this S355G10+N steel plate adopts following compositions proportioning and production method.
This S355G10+N steel plate thickness is 125mm, component content (wt) is: C 0.11%, Si 0.26%, Mn 1.65%, P 0.008%, S 0.005%, V 0.052%, Nb 0.020%, Al 0.029%, Ceq 0.43%, Pcm 0.20%, all the other are Fe and inevitable impurity.
The production method of this steel plate is as follows: (1) casting process: adopt 28T slab ingot mould to cast, protect superheating temperature and control at 35 DEG C.
(2) heating process: by II group of steel heating cycle, maximum heating temperature 1235 DEG C, steel ingot less than 1000 DEG C heat-up rates 120 DEG C/h, >=1000 DEG C of heat-up rates are not limit.
After Rolling from Ingot makes steel billet, steel billet needs again to enter stove heating rolling; The heating coefficient 14min/cm of its steel billet, maximum heating temperature 1230 DEG C, soaking zone soaking time 90min.
(3) rolling technology: adopt II type controlled rolling process, first stage rolling is at 950 DEG C, and reduction in pass is 30 ~ 32%, accumulative draft 85%; Subordinate phase start rolling temperature is 850 DEG C, and finishing temperature is 780 DEG C, accumulative draft 30%.
(4) water-cooling process: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, red temperature is 700 DEG C; Roll rear timely stacking slow cooling, 60 hours stacking time.
(5) thermal treatment process: Heating temperature 920 DEG C, total heat-up time: 2.4min/mm.
This S355G10+N steel plate rolls into 125mm steel plate, and steel plate homogeneous microstructure is tiny, and organize grain fineness number at 10.5 grades, organization type is: ferrite+perlite, and a small amount of bainite, banded structure grade 0 grade.Mechanical property is: yield strength 416MPa, tensile strength 593MPa, yield tensile ratio=0.70, δ 5=32%;-40 DEG C of ballistic work AKV(laterally, thickness of slab 1/2 place): 233,216,226J;-40 DEG C of timeliness ballistic work AKV(laterally, thickness of slab 1/2 place): 153,139,172J; Z-direction: 52,55,53%.
Claims (8)
1. a heavy thickness ocean platform S355G10+N steel plate, is characterized in that, the weight percent of described steel plate chemical composition is: C 0.08 ~ 0.12%, Si 0.15 ~ 0.50%, Mn 1.40 ~ 1.65%, P≤0.015%, S≤0.005%, V 0.040 ~ 0.060%, Nb 0.020 ~ 0.030%, Al 0.020 ~ 0.050%, Ceq≤0.43%, Pcm≤0.22%, all the other are Fe and inevitable impurity.
2. heavy thickness ocean platform S355G10+N steel plate according to claim 1, is characterized in that: described steel plate thickness is 100mm ~ 150mm.
3. a heavy thickness ocean platform production method for S355G10+N steel plate, is characterized in that: it comprises smelting, casting, heating, rolling, cooling and heat treatment step; The weight percent of described steel plate chemical composition is: C 0.08 ~ 0.12%, Si 0.15 ~ 0.50%, Mn 1.40 ~ 1.65%, P≤0.015%, S≤0.005%, V 0.040 ~ 0.060%, Nb 0.020 ~ 0.030%, Al 0.020 ~ 0.050%, Ceq≤0.43%, Pcm≤0.22%, all the other are Fe and inevitable impurity.
4. the production method of heavy thickness ocean platform S355G10+N steel plate according to claim 3, is characterized in that, described heating process: steel ingot heats in process furnace, less than 1000 DEG C heat-up rate≤120 DEG C/h, maximum heating temperature≤1240 DEG C; After coming out of the stove, Rolling from Ingot is made steel billet; Steel billet enters process furnace heating again, and heating coefficient >=10min/cm, maximum heating temperature≤1240 DEG C, soaking zone soaking time is greater than 90min.
5. the production method of heavy thickness ocean platform S355G10+N steel plate according to claim 3, is characterized in that, described heat treatment step: Heating temperature 920 DEG C ± 10 DEG C, total heat-up time is 2.0 ~ 2.4min/mm.
6. the production method of heavy thickness ocean platform S355G10+N steel plate according to claim 3, is characterized in that, described casting operation: adopt ingot mould cast, superheating temperature controls at 20 DEG C ~ 50 DEG C.
7. the production method of heavy thickness ocean platform S355G10+N steel plate according to claim 3, it is characterized in that, described rolling process: adopt II type controlled rolling process, first stage rolling is between 950 ~ 1100 DEG C, this stage reduction in pass is 25 ~ 35%, accumulative draft >=70%; Start rolling temperature≤900 DEG C of subordinate phase, finishing temperature≤820 DEG C, accumulative draft >=30%.
8. the heavy thickness ocean platform production method of S355G10+N steel plate according to claim 3-7 any one, is characterized in that, described refrigerating work procedure: the steel plate after rolling enters ACC and cools fast, red temperature 650 DEG C ~ 700 DEG C; Then carry out stacking slow cooling, 48 hours stacking time and more than.
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| CN111088417B (en) * | 2020-01-07 | 2021-01-05 | 钢铁研究总院 | Ceq and Pcm high heat input welding normalizing EH36 extra-thick plate and manufacturing method thereof |
| WO2021189621A1 (en) * | 2020-03-25 | 2021-09-30 | 南京钢铁股份有限公司 | S355g10+n-thickness steel plate for offshore structure and production method therefor |
| CN114807761A (en) * | 2022-04-28 | 2022-07-29 | 鞍钢股份有限公司 | EH36 grade ocean engineering steel with high ductility and manufacturing method thereof |
| CN114807761B (en) * | 2022-04-28 | 2023-08-18 | 鞍钢股份有限公司 | EH36 grade marine engineering steel having high ductility and method for manufacturing same |
| CN115679203A (en) * | 2022-09-15 | 2023-02-03 | 舞阳钢铁有限责任公司 | Super-thick S355NLO steel plate for offshore oil storage ship and production method thereof |
| CN115679203B (en) * | 2022-09-15 | 2023-12-29 | 舞阳钢铁有限责任公司 | Super-thick S355NLO steel plate for offshore oil storage ship and production method thereof |
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