CN103436784B - Steel plate for offshore platform and preparation method thereof - Google Patents
Steel plate for offshore platform and preparation method thereof Download PDFInfo
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- CN103436784B CN103436784B CN201310423507.3A CN201310423507A CN103436784B CN 103436784 B CN103436784 B CN 103436784B CN 201310423507 A CN201310423507 A CN 201310423507A CN 103436784 B CN103436784 B CN 103436784B
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Abstract
The invention provides a steel plate for an offshore platform and a preparation method thereof. According to the steel plate for the offshore platform and the preparation method thereof, the steel plate, with large thickness and high toughness, for the offshore platform is produced through Nb/V/Ti/Ni micro-alloying, low carbon equivalent Ceq, low welding crack sensitivity index Pcm, large-thickness continuous casting, large rough-rolling depressing amount, controlled rolling, controlled cooling and a normalizing heat treatment process, the production cost is lower, and the lateral impact performance of the center at the temperature of -40 DEG C is good.
Description
Technical field
The invention belongs to boats and ships and oceanographic engineering structure iron technical field, particularly a kind of offshore platform steel plate and manufacture method thereof.
Background technology
Along with the accelerate development of domestic marine oil and Sweet natural gas, promoted the manufacturing development of marine engineering equipment, steel plate for ocean engineering demand prospect is had an optimistic view of.
The all technical of offshore platform steel plate requires high, must have the performances such as high strength, high tenacity, antifatigue, anti-lamellar tearing, good weldability, seawater corrosion resistance and good cold-workability.Oneself warp of domestic offshore platform steel plate is extensive to be adopted, and below EH36 rank realizes production domesticization substantially, accounts for 90% of Platform Steel amount, but key position heavy thickness used, High Strength Steel still dependence on import.Along with offshore platform structure keeps the large-scale development, required steel plate thickness increases thereupon, has higher requirement to the performance of offshore platform steel plate.
In this context, be badly in need of the R&D and promotion carrying out high-performance marine Platform Steel plate, especially develop heavy thickness high tenacity offshore platform steel plate particularly urgent.
Application number be 201110355557.3 application discloses a kind of heavy thickness steel plate for ocean engineering and production method thereof, its chemical composition mass percent is: C:0.07% ~ 0.09%, Si:0.15% ~ 0.40%, Mn:1.40% ~ 1.50%, P≤0.012%, S≤0.005%, Ni:0.60% ~ 0.70%, Nb:0.030% ~ 0.040%, Al:0.020% ~ 0.045%, Mo:0.13% ~ 0.17%, V:0.04% ~ 0.05%, Ti:0.012% ~ 0.020%, surplus is Fe and inevitable impurity; This invention adopts electrosmelting, and thickness of strand is 330mm, and steel plate adopts recrystallize and non-recrystallization two-phase control rolling+quenching, temper.Above-mentioned patent with the addition of Ni (0.60% ~ 0.70%), Mo (0.13% ~ 0.17%), and the price of Ni, Mo alloy is more expensive, and cost is higher, and adopts quenching+tempering technique, and the production cycle is long.
Application number be 201210182698.4 application discloses a kind of high-performance marine Platform Steel and production method thereof, when steel plate thickness is 40 ~ 100mm, the weight percent chemical composition of steel plate consists of: C:0.10% ~ 0.12%, Si:0.20% ~ 0.50%, Mn:1.50% ~ 1.60%, P≤0.012%, S≤0.003%, V:0.070% ~ 0.075%, Nb:0.030% ~ 0.040%, Ti≤0.050%, Al:0.020% ~ 0.050%, surplus is Fe and inevitable impurity; This invention adopts electrosmelting, and < 90mm steel plate adopts 300mm continuously cast bloom, and >=90mm steel plate adopts direct casting, and steel plate adopts recrystallize and non-recrystallization two-phase control rolling, water-cooled after normalizing thermal treatment+normalizing.Above-mentioned patent with the addition of more Mn, V, Ti, and >=90mm steel plate adopts die casting, and water-cooled after normalizing, process costs is high, and the production cycle is long;-20 DEG C of central transverse impact better performances, can-40 DEG C of central transverse impact performances be unknown, can not determine the environment for use requirement that meet less than-20 DEG C.
Summary of the invention
Object of the present invention is exactly defect for above-mentioned existence and provides a kind of offshore platform steel plate and manufacture method thereof, the present invention is by Nb/V/Ti/Ni microalloying, low-carbon-equivalent Ceq, low-welding crack-sensitive indices P cm, heavy thickness continuously cast bloom, roughing heavy reduction, controlled rolling and controlled cooling and normalizing heat treatment technique, produce heavy thickness high tenacity offshore platform steel plate, production cost is lower, and-40 DEG C of central transverse impact are functional.
A kind of offshore platform steel plate of the present invention and manufacture method technical scheme thereof are, described steel plate thickness specification is (60,100] mm, steel plate chemical composition mass percent is: C:0.10 ~ 0.15%, Si:0.20 ~ 0.50%, Mn:1.30 ~ 1.60%, P :≤0.015%, S :≤0.005%, Al:0.015 ~ 0.055%, Nb:0.030 ~ 0.060%, V:0.040 ~ 0.080%, Ti:0.008 ~ 0.020%, Ni:0.20 ~ 0.40%, Nb+V+Ti≤0.12%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity.
Preferably, steel plate thickness specification is 100mm, and steel plate chemical composition mass percent is: C:0.12%, Si:0.27%, Mn:1.45%, P:0.014%, S:0.003%, Al:0.033%, Nb:0.043%, V:0.062%, Ti:0.015%, Ni:0.31%, Ceq:0.416, Pcm:0.221%, surplus is Fe and inevitable impurity.
Steel plate lower yield strength 365 ~ 435MPa, tensile strength 510 ~ 570MPa, elongation after fracture 24 ~ 35%, at-40 DEG C, Charpy absorption merit is longitudinally average at more than 180J, and Z-direction Tensile fracture shrinking percentage is on average more than 43%.
The manufacture method of this offshore platform steel plate, processing step comprises: blast-melted, molten iron pre-desulfurization, converter smelting, deoxidation alloying, LF refining, RH refining, sheet billet continuous casting, slab roll off the production line that stacking slow cooling, slab cleaning, slab reheat, 4300 milling train roughing, 4300 milling train controlled rollings, Mulpic control are cold, steel plate stacking slow cooling, flaw detection, normalizing, finished product inspection by sampling, warehouse-in.
Concrete technology condition is:
(1) molten iron pre-desulfurization, enters stove molten iron S≤0.003%, converter smelting molten steel, and molten steel is through LF, RH refining, and [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, become 300mm heavy slab by molten steel casting, the stacking slow cooling that rolls off the production line more than 72 hours;
(2) slab inspection cleaning after shove charge heating, heat-up time 0.9 ~ 1.0min/mm, tapping temperature 1100 ~ 1180 DEG C;
(3) slab is through high-pressure water descaling, and high-pressure water pressure is 19 ~ 20Mpa, enters 4300mm mill milling;
(4) rough rolling step improves reduction in pass, has 2 reduction in pass >=30mm at least;
(5) finish rolling ensures finishing temperature: steel plate finishing temperature control is at 810 ± 10 DEG C;
(6) water-cooled immediately after rolling, final cooling temperature 600 ~ 650 DEG C, rate of cooling 4 ~ 8 DEG C/s;
(7) normalizing treatment temperature: 900 ± 10 DEG C; Soaking time: 1.5min/mm+10min.
Preferably, step (1) molten steel is through LF, RH refining, and [N]: 25ppm, [O]: 20ppm, [H]: 1.2ppm, becomes 300mm heavy slab by molten steel casting, the stacking slow cooling that rolls off the production line more than 72 hours.
Step (2) slab inspection cleaning after shove charge heating, heat-up time 285min, tapping temperature 1170 DEG C.
During step (5) finish rolling, steel plate finishing temperature control is at 810 DEG C.
Step (6) water-cooled immediately after rolling, final cooling temperature 630 DEG C, rate of cooling 5.8 DEG C/s.
Step (7) normalizing treatment temperature: 900 DEG C; Soaking time: 160min.
Beneficial effect of the present invention is: the heavy thickness high tenacity offshore platform steel plate that the present invention produces, and producible maximum ga(u)ge is 100mm; This steel plate adopts Nb, V, Ti microalloy composition, add a small amount of Ni, by low-carbon-equivalent Ceq, low-welding crack-sensitive indices P cm, heavy thickness continuously cast bloom, roughing heavy reduction, controlled rolling and controlled cooling and normalizing heat treatment technique, reduce production cost, and can ensure that mechanical property is even: lower yield strength 365 ~ 435MPa, tensile strength 510 ~ 570MPa, elongation after fracture 24 ~ 35%, at-40 DEG C, Charpy absorption merit is longitudinally average at more than 180J, and Z-direction Tensile fracture shrinking percentage is on average more than 43%.。
accompanying drawing illustrates:
Figure 1 shows that the 100X micro-organization chart on the nearly surface of 100mm steel plate in embodiment 1;
Figure 2 shows that 100X micro-organization chart of 100mm steel plate 1/4th place in embodiment 1;
Figure 3 shows that 100mm steel plate center 100X micro-organization chart in embodiment 1;
Figure 4 shows that the 500X micro-organization chart on the nearly surface of 100mm steel plate in embodiment 1;
Figure 5 shows that 500X micro-organization chart of 100mm steel plate 1/4th place in embodiment 1;
Figure 6 shows that 100mm steel plate center 500X micro-organization chart in embodiment 1;
Figure 7 shows that the 100X micro-organization chart on the nearly surface of 80mm steel plate in embodiment 2;
Figure 8 shows that 100X micro-organization chart of 80mm steel plate 1/4th place in embodiment 2;
Figure 9 shows that 80mm steel plate center 100X micro-organization chart in embodiment 2;
Figure 10 shows that the 500X micro-organization chart on the nearly surface of 80mm steel plate in embodiment 2;
Figure 11 shows that 500X micro-organization chart of 80mm steel plate 1/4th place in embodiment 2;
Figure 12 shows that 80mm steel plate center 500X micro-organization chart in embodiment 2.
embodiment:
In order to understand the present invention better, describe technical scheme of the present invention in detail with specific examples below, but the present invention is not limited thereto.
Embodiment 1
Technical process of the present invention is: blast-melted → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refining → RH refining → sheet billet continuous casting → slab roll off the production line stacking slow cooling → slab cleaning → slab reheat → 4300 milling train roughing → 4300 milling train controlled rollings → Mulpic controls cold → steel plate stacking slow cooling → flaw detection → normalizing → finished product inspection by sampling → warehouse-in.
According to chemical composition ranges provided by the invention, according to the processing condition of above-mentioned technical process and regulation, smelting molten steel in 210 tons of converters, becomes 300mm heavy slab by molten steel casting, rolling 100mm steel plate on 4300mm wide and heavy plate mill.
The chemical composition of steel plate is in table 1;
Table 1
。
Heating, rolling, normalizing process parameter are in table 2;
Table 2
。
The behavior pattern of steel plate is in table 3;
Table 3
。
Steel plate microtexture is shown in Figure of description 1-6.
Embodiment 2
Technical process of the present invention is: blast-melted → molten iron pre-desulfurization → converter smelting → deoxidation alloying → LF refining → RH refining → sheet billet continuous casting → slab roll off the production line stacking slow cooling → slab cleaning → slab reheat → 4300 milling train roughing → 4300 milling train controlled rollings → Mulpic controls cold → steel plate stacking slow cooling → flaw detection → normalizing → finished product inspection by sampling → warehouse-in.
According to chemical composition ranges provided by the invention, according to the processing condition of above-mentioned technical process and regulation, smelting molten steel in 210 tons of converters, becomes 300mm heavy slab by molten steel casting, rolling 80mm steel plate on 4300mm wide and heavy plate mill.
The chemical composition of steel plate is in table 4;
Table 4
。
Heating, rolling, normalizing process parameter are in table 5;
Table 5
。
The behavior pattern of steel plate is in table 6;
Table 6
。
Steel plate microtexture is shown in Figure of description 7-12.
Claims (7)
1. an offshore platform steel plate, is characterized in that, steel plate thickness specification is (80,100] mm, steel plate chemical composition mass percent is: C:0.10 ~ 0.15%, Si:0.20 ~ 0.50%, Mn:1.30 ~ 1.60%, P :≤0.015%, S :≤0.005%, Al:0.015 ~ 0.055%, Nb:0.030 ~ 0.060%, V:0.040 ~ 0.080%, Ti:0.008 ~ 0.020%, Ni:0.20 ~ 0.40%, Nb+V+Ti≤0.12%, Ceq≤0.43, Pcm≤0.23%, surplus is Fe and inevitable impurity;
Steel plate lower yield strength 365 ~ 435MPa, tensile strength 510 ~ 570MPa, elongation after fracture 24 ~ 35%, at-40 DEG C, Charpy absorption merit is longitudinally average at more than 180J, and Z-direction Tensile fracture shrinking percentage is on average more than 43%;
The manufacture method of described a kind of offshore platform steel plate, processing step comprises: blast-melted, molten iron pre-desulfurization, converter smelting, deoxidation alloying, LF refining, RH refining, sheet billet continuous casting, slab roll off the production line that stacking slow cooling, slab cleaning, slab reheat, 4300 milling train roughing, 4300 milling train controlled rollings, Mulpic control are cold, steel plate stacking slow cooling, flaw detection, normalizing, finished product inspection by sampling, warehouse-in;
Concrete technology condition is:
(1) molten iron pre-desulfurization, enters stove molten iron S≤0.003%, converter smelting molten steel, and molten steel is through LF, RH refining, and [N]≤30ppm, [O]≤25ppm, [H]≤1.5ppm, become 300mm heavy slab by molten steel casting, the stacking slow cooling that rolls off the production line more than 72 hours;
(2) slab inspection cleaning after shove charge heating, heat-up time 0.9 ~ 1.0min/mm, tapping temperature 1100 ~ 1180 DEG C;
(3) slab is through high-pressure water descaling, and high-pressure water pressure is 19 ~ 20MPa, enters 4300mm mill milling;
(4) rough rolling step improves reduction in pass, has 2 reduction in pass >=30mm at least;
(5) finish rolling ensures finishing temperature: steel plate finishing temperature control is at 810 ± 10 DEG C;
(6) water-cooled immediately after rolling, final cooling temperature 600 ~ 650 DEG C, rate of cooling 4 ~ 8 DEG C/s;
(7) normalizing treatment temperature: 900 ± 10 DEG C; Soaking time: 1.5min/mm+10min.
2. a kind of offshore platform steel plate according to claim 1, is characterized in that, steel plate thickness specification is 100mm, steel plate chemical composition mass percent is: C:0.12%, Si:0.27%, Mn:1.45%, P:0.014%, S:0.003%, Al:0.033%, Nb:0.043%, V:0.062%, Ti:0.015%, Ni:0.31%, Ceq:0.416, Pcm:0.221%, surplus is Fe and inevitable impurity.
3. a kind of offshore platform steel plate according to claim 1, is characterized in that, step (1) molten steel is through LF, RH refining, [N]: 25ppm, [O]: 20ppm, [H]: 1.2ppm, molten steel casting is become 300mm heavy slab, the stacking slow cooling that rolls off the production line more than 72 hours.
4. a kind of offshore platform steel plate according to claim 1, is characterized in that, step (2) slab inspection cleaning after shove charge heating, heat-up time 285min, tapping temperature 1170 DEG C.
5. a kind of offshore platform steel plate according to claim 1, is characterized in that, during step (5) finish rolling, steel plate finishing temperature control is at 810 DEG C.
6. a kind of offshore platform steel plate according to claim 1, is characterized in that, step (6) water-cooled immediately after rolling, final cooling temperature 630 DEG C, rate of cooling 5.8 DEG C/s.
7. a kind of offshore platform steel plate according to claim 1, is characterized in that, step (7) normalizing treatment temperature: 900 DEG C; Soaking time: 160min.
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| CN103667909B (en) * | 2013-12-13 | 2016-02-03 | 武汉钢铁(集团)公司 | A kind of mobile ocean Platform Steel of yield tensile ratio≤0.65 and production method |
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| CN105220068A (en) * | 2015-10-20 | 2016-01-06 | 南京钢铁股份有限公司 | A kind of special thick Marine Engineering Steel and preparation method thereof |
| CN105239003A (en) * | 2015-11-20 | 2016-01-13 | 山东钢铁股份有限公司 | Thick gauge steel plate for offshore platform and production method of thick gauge steel plate |
| CN105779865B (en) * | 2016-05-30 | 2017-06-23 | 山东钢铁股份有限公司 | A kind of Thin Specs steel plate for ocean engineering and preparation method thereof |
| CN108070790A (en) * | 2016-11-13 | 2018-05-25 | 广东韶钢松山股份有限公司 | A kind of yield strength 390MPa grades of normalized steel plates and its manufacturing method |
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| CN108950381A (en) * | 2018-06-19 | 2018-12-07 | 舞阳钢铁有限责任公司 | Normalizing type marine engineering equipment special thick low-alloy high strength steel plate and its production method |
| CN110042314A (en) * | 2019-03-22 | 2019-07-23 | 南京钢铁股份有限公司 | A kind of wind-powered electricity generation low-carbon-equivalent S355NL normalizing slab and its production method |
| CN111455271B (en) * | 2020-03-25 | 2021-10-26 | 南京钢铁股份有限公司 | Steel plate with thickness of S355G10+ N for ocean structure and production method thereof |
| CN112126847B (en) * | 2020-07-31 | 2021-12-03 | 天津钢铁集团有限公司 | Large-thickness Q420FTE high-strength steel plate for wind tower structure and production method thereof |
| CN111961967B (en) * | 2020-07-31 | 2021-09-21 | 天津钢铁集团有限公司 | Steel plate for small-compression-ratio thick-specification controlled rolling type Q345GJE building structure and production method thereof |
| CN112048665B (en) * | 2020-08-17 | 2022-03-22 | 莱芜钢铁集团银山型钢有限公司 | Steel plate for polar region ocean engineering and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011050A (en) * | 2010-07-15 | 2011-04-13 | 秦皇岛首秦金属材料有限公司 | Steel for 36kg-grade ocean platform and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102011050A (en) * | 2010-07-15 | 2011-04-13 | 秦皇岛首秦金属材料有限公司 | Steel for 36kg-grade ocean platform and production method thereof |
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