CN102732789B - High-performance ocean platform steel and its production method - Google Patents
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Abstract
The invention provides high-performance ocean platform steel and its production method. When the thickness of a steel plate is 8-40mm, the steel plate is composed of the following chemical components, by weight, 0.11-0.13% of C, 0.20-0.50% of Si, 1.45-1.55% of Mn, 0.012% or less of P, 0.003% or less of S, 0.035-0.045% of V, 0.025-0.030% of Nb, 0.050% or less of Ti, 0.020-0.050% of Al, and the balance Fe and inevitable impurities; and when thickness of a steel plate is 40-100mm, the steel plate is composed of the following chemical components, by weight, 0.10-0.12% of C, 0.20-0.50% of Si, 1.50-1.60% of Mn, 0.012% or less of P, 0.003% or less of S, 0.070-0.075% of V, 0.030-0.040% of Nb, 0.050% or less of Ti, 0.020-0.050% of Al, and the balance Fe and inevitable impurities. The production method of the steel plate of the invention comprises the steps of electric furnace smelting, LF furnace refining, VD vacuum treatment, continuous casting (or die casting), heating, control rolling, cooling, stacking, and normalizing to prepare the steel plate. Through a reasonable component design and process optimization, the steel plate of the invention has excellent mechanical performances, welding performances and processing performances, and has strong market competitiveness.
Description
Technical field
The invention belongs to the manufacturing technology field of steel plate, be specifically related to a kind of high-performance marine Platform Steel 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%.The projects such as Li Gulf, Li Shui, the huge great waves of kind Yu, victory Bao Wang, for CNOOC's South China Sea Deep Water construction of natural gas fields project, workable reserve is 4 ~ 6 Tcf Sweet natural gases, is the first deep water self-elevating ocean platform of China's Independent Development Design, this type of by the every annual requirement of steel more than 100,000 tons.The performances such as current offshore platform steel intensity and low-temperature flexibility are all relatively little, have impact on the use of this type of steel plate.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide and a kind of there is good obdurability and the good 8 ~ 100mm high-performance marine Platform Steel of welding property.
Meanwhile, the present invention also aims to the production method that a kind of 8 ~ 100mm high-performance marine Platform Steel is provided.
To achieve these goals, technical program of the present invention lies in have employed a kind of high-performance marine Platform Steel, be made up of the chemical composition of following weight percent: C:0.11% ~ 0.13%, Si:0.20% ~ 0.50%, Mn:1.45% ~ 1.55%, P≤0.012%, S≤0.003%, V:0.035% ~ 0.045%, Nb:0.025% ~ 0.030%, Ti≤0.050%, Al:0.020% ~ 0.050%, surplus is Fe and inevitable impurity.Described steel plate thickness is 8 ~ 40mm.
A kind of high-performance marine Platform Steel, be made up of the chemical composition of following weight percent: 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.Described steel plate thickness is 40 ~ 100mm.
The effect of each element in this steel grade is:
Carbon (C): in steel, carbon content increases, yield-point and tensile strength raise, but plasticity and impact reduce, and can affect welding property and the toughness (aging performance etc.) of steel.Therefore for two kinds of thickness ranges, 8 ~ 40mm is defined, C:0.11% ~ 0.13%; 40 ~ 100mm, C:0.10% ~ 0.12%.
Silicon (Si): as reductive agent and reductor in steelmaking process, Si also can play solution strengthening effect simultaneously, but during more than 0.5%, the toughness of steel can be caused to decline, and reduces the welding property of steel.
Manganese (Mn): manganese is with low cost, can increase the toughness of steel, intensity and hardness, improves the hardening capacity of steel, improves the hot workability of steel; Manganese amount is too high, easily occurs center segregation for heavy thickness steel plate.In this steel grade, manganese Main Function is for improving intensity.For two kinds of thickness ranges, define 8 ~ 40mm, Mn:1.45% ~ 1.55%; 40 ~ 100mm, Mn:1.50% ~ 1.60%.
Phosphorus (P), sulphur (S): generally, p and s is all harmful element in steel, increases the fragility of steel.Phosphorus makes welding property degenerate, and reduces plasticity, cold-bending property is degenerated; Sulphur reduces ductility and the toughness of steel, causes crackle when forging and rolling; Therefore should reduce the content of p and s in steel as far as possible.For platform steel, because standard requires more strict to phosphorus (P), sulphur (S), therefore just specify when design mix: P≤0.012%, S≤0.003%,
Niobium (Nb): in heating, the operation of rolling, the precipitated phase that niobium element and carbon, nitrogen are formed is at hot stage stable existence or be dissolved in the solid solution effect of dragging of the microalloy element in austenite at hot stage, thus hinder recrystal grain alligatoring.The tiny precipitated phase that hot stage exists is pinned at crystal boundary, has obvious inhibition to the movement of crystal boundary; When crystal boundary moves and completes a business transaction with Second Phase Particles, this interaction meeting absorption interface energy, thus postpone the movement at interface, stop growing up of austenite crystal, crystal grain thinning, thus improve intensity and toughness.General steel grade adds 0.020% ~ 0.050% niobium element and just can meet, and having added many can cause waste.
Vanadium (V): vanadium mainly plays solution strengthening and precipitation strength effect in steel, strengthening matrix, improves the intensity of steel plate.Due to vanadium price, other alloys are cheap relatively, just can improve intensity, need not add alloy costly by adding appropriate vanadium, as: molybdenum (Mo), titanium (Ti) etc.General vanadium adds different according to steel plate thickness in right amount and increases, and be less than 40mm steel plate, add-on is 0.035% ~ 0.045%; Be greater than 40mm steel plate, add-on is 0.070% ~ 0.075% just can to have met the demands.
Titanium (Ti): steel in use, often will weld, welding joint is its weak link, particularly heat affected zone, the easiest in this destruction.In steel, add the titanium of trace, by impurity as oxygen, nitrogen, sulphur etc. are fixed up, thus the weldability of steel can be improved; Secondly, due to the effect of its microcosmic particle, such as TiN non-solvability at high temperature, can stop the alligatoring of heat affected zone crystal grain, improves the toughness of heat affected zone, thus improves the welding property of steel.Generally because slab crystal grain is comparatively large, add appropriate titanium and can improve welding property and actual effect performance, add-on is no more than 0.050%, and thin plate (8 ~ 80mm) does not generally add.
Aluminium (Al): nitrogen agent is determined in deoxidation when being used as steel-making; A small amount of aluminium is added in steel, can crystal grain thinning, improve the impelling strength when low temperature, reduce the brittle transition temperature of steel.General steel grade adds the Al of 0.020%-0.050%.
Meanwhile, technical program of the present invention also lies in the production method that have employed a kind of high-performance marine Platform Steel, comprise the following steps:
(1) smelt: molten steel, first through electrosmelting, is then sent into the refining of LF refining furnace, fed more than 550 meters, Al line, white slag hold-time >=45min, lime consumption >=17kg/t steel, process and [Al] >=0.015% of skimming; Bull ladle VD stove vacuum-treat after refining, add more than SiCa block 100kg/ stove before vacuum, vacuum tightness is not more than 66Pa, vacuum hold-time >=20min time destroy vacuum, reduce nonmetallic inclusionsin steel, harmful element content to greatest extent, ensure the purity of molten steel;
(2) cast: after vacuum breaking, temperature is at 1545 ± 10 DEG C, the steel plate for thickness < 90mm adopts the casting of 300mm continuous caster, and superheating temperature controls at 15 ~ 40 DEG C; For the steel plate of thickness >=90mm, adopt direct casting, superheating temperature controls at 20 ~ 50 DEG C;
(3) heat: steel ingot and steel billet all perform II group heating cycle, maximum heating temperature≤1260 DEG C, ensure that ingot blank burns evenly thoroughly, heat-up rate≤120 DEG C/h below 1000 DEG C, during temperature >=1000 DEG C, heat-up rate is not limit, and heating coefficient is 9 ~ 12min/cm;
(4) rolling: adopt II type controlled rolling process, first stage rolling is between 950 ~ 1100 DEG C, and this stage single pass draught is 10 ~ 25%, accumulative draft >=70%, makes austenite generation perfect recrystallization, with fining austenite grains; Subordinate phase is the austenite non-recrystallize stage, start rolling temperature≤880 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, thus ferritic nucleation site is added, refinement ferrite crystal grain, this stage draft should try one's best greatly, accumulative draft >=30%;
(5) cool: roll rear steel plate and carry out on-line cooling at ACC quickly cooling device, red temperature is 650 ~ 700 DEG C;
(6) stacking slow cooling: timely stacking slow cooling after steel plate rolling, stacking temperature >=500 DEG C, require during stacking that steel plate head or shoulder align as far as possible, more than 48 hours stacking time;
(7) normalizing treatment: the heat treatment furnace process that steel plate normalizing will select the working of a furnace good, reduces roll marks, and normalizing is abundant, and normalizing Heating temperature is 910 ± 10 DEG C, and total heat-up time is 1.5 ~ 2.0min/mm, water-cooled after normalizing, and steel plate red temperature is 650 ± 10 DEG C.
Total refining time >=the 60min of die casting described in step (1), the total refining time >=55min of continuous casting.
To the development of Yu Haiyang with platform steel, by formulating strict quality planning and development technology scheme, the links in production control, guarantees quality product.
(1) technological process of production
Electrosmelting → LF stove refining → VD vacuum-treat → continuous casting (or die casting) → heating → controlled rolling → ACC controlled cooling model → stacking → normalizing → service check → warehouse-in.
(2) Composition Design
Composition Design adopts the mentality of designing of low-carbon (LC), high microalloying, solves the requirement of carbon, manganese segregation problems and high strength, high impact toughness; 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.
(3) plate surface quality requirement
Adopt the become a useful person mode of production of rolling of secondary that steel surface can be made bright and clean, there is no dirt, wrinkle, phosphorus skin and rust staining, the requirement that steel plate does not allow soldering can also be reached, Optimization Technology, control plate shape and surface quality well.
(4) steel plate tissue
By reasonable heat treating regime, obtain ferrite and pearlite tissue, surface of steel plate bainite layer is few, grain fineness number more than 8 grades, and banded structure grade is lower than 1.5 grades of requirements.
The present invention has the following advantages: 1. good mechanical performance, and yield strength and tensile strength comparatively Thin Specs performance index have larger surplus capacity; 2. low-temperature impact work is high, and-20 DEG C of ballistic works are more than 100 Jiao; 3. Z-direction performance (relative reduction in area %) is about 50%; 4. carbon equivalent Ceq≤0.41%, welding sensitivity coefficient Pcm≤0.21%; 5. steel plate maximum ga(u)ge can reach 100mm.
Embodiment
Embodiment 1
The thickness of the offshore platform steel of the present embodiment is greater than 90mm, and the actual constituent (by weight percentage) of steel plate is: C:0.10%, Si:0.28%, Mn:1.56%, P:0.010%, S:0.001%, Al:0.037%, Nb:0.037%, V:0.075%, Ti:0.045%, surplus is Fe and inevitable impurity, Ceq is 0.40%, Pcm is 0.20%.
The production method of steel plate of the present invention is as follows:
(1) smelt: molten steel, first through electrosmelting, when contracting out greatly steel, adding alloy 1 ton, comprising reductor Si-Mn, avoid Molten Steel over-oxidation degree to strengthen, and when contracting out greatly steel, P must be less than 0.008%, not allowing to see that slag is tapped; Send into the refining of LF refining furnace, and feed 650 meters, Al line, lime 1720kg, Si-Fe powder 123kg, white slag keeps 55min, the vacuum-treat of VD stove, add SiCa block 130kg/ stove before vacuum, vacuum tightness 66Pa, during hold-time 23min, destroy vacuum, solve molten steel and depend merely on the deoxidation of Al line, phenomenon that nonmetallic inclusionsin steel content is higher, ensure that the purity of steel;
(2) cast: after vacuum breaking, then adopt 33.4T slab ingot mould to cast, ensure that heavy thickness, greatly substance steel plate have enough draught and raw material of becoming a useful person, carbonization rice husk add-on 12 bags/, superheating temperature controls at 30 DEG C;
(3) heat: by II group heating cycle, maximum heating temperature 1260 DEG C, ensures that steel ingot is grilled thoroughly evenly, heat-up rate 120 DEG C/h below 1000 DEG C, and a temperature >=1000 DEG C heat-up rate is not limit, heating coefficient 9min/cm;
(4) rolling: adopt II type controlled rolling process, the first stage is the austenite recrystallization stage, and rolling temperature is between 1000 DEG C, this stage single pass draught is 15%, accumulative draft 80%, makes austenite generation perfect recrystallization, with fining austenite grains; Subordinate phase is the austenite non-recrystallize stage, start rolling temperature is 880 DEG C, finishing temperature is 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, thus ferritic nucleation site is added, refinement ferrite crystal grain, this stage draft should try one's best greatly, accumulative draft 50%;
(5) cool: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, and red temperature is 680 DEG C;
(6) stacking slow cooling: roll rear timely stacking slow cooling, stacking temperature >=500 DEG C, alignment as far as possible during stacking; 60 hours stacking time, the time of reaching can de-stacking, turnover panel, reconditioning, during de-stacking steel temperature >=100 DEG C, forbid cooling of fetching water;
(7) normalizing treatment: carry out normalizing treatment to steel plate, Heating temperature 920 DEG C, total heat-up time: 2.0min/mm, carries out water-cooled after normalizing, and steel plate red temperature is 650 DEG C.
The mechanical property of table 1 the present embodiment steel plate
Embodiment 2
The thickness of the offshore platform steel of the present embodiment is≤40mm, the actual constituent (by weight percentage) of steel plate is: C:0.12%, Si:0.27%, Mn:1.48%, P:0.009%, S:0.001%, Al:0.038%, Nb:0.027%, V:0.038%, surplus is Fe and inevitable impurity, and Ceq is 0.38%, Pcm is 0.21%.
The production method of steel plate of the present invention is as follows:
(1) smelt: molten steel, first through electrosmelting, when contracting out greatly steel, adding alloy 1 ton, comprising reductor Si-Mn, avoid Molten Steel over-oxidation degree to strengthen, and when contracting out greatly steel, P must be less than 0.008%, not allowing to see that slag is tapped; Send into the refining of LF refining furnace, and feed 650 meters, Al line, lime 1720kg, Si-Fe powder 123kg, white slag keeps 55min, the vacuum-treat of VD stove, add SiCa block 130kg/ stove before vacuum, vacuum tightness 66Pa, during hold-time 23min, destroy vacuum, solve molten steel and depend merely on the deoxidation of Al line, phenomenon that nonmetallic inclusionsin steel content is higher, ensure that the purity of steel;
(2) cast: after vacuum breaking, then adopt continuous casting and cast, cast billet specification is 300mm × 2000mm, and superheating temperature controls at 30 DEG C;
(3) heat: by II group heating cycle, maximum heating temperature 1260 DEG C, ensure that ingot blank burns evenly thoroughly, heat-up rate 100 DEG C/h below 1000 DEG C, during temperature >=1000 DEG C, heat-up rate is not limit, and heating coefficient is 12min/cm;
(4) rolling: adopt II type controlled rolling process, the first stage is the austenite recrystallization stage, and rolling temperature is between 1100 DEG C, this stage single pass draught is 15%, accumulative draft 80%, makes austenite generation perfect recrystallization, with fining austenite grains; Subordinate phase is the austenite non-recrystallize stage, start rolling temperature is 880 DEG C, finishing temperature is 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, thus ferritic nucleation site is added, refinement ferrite crystal grain, this stage draft should try one's best greatly, accumulative draft 50%;
(5) cool: the steel plate after rolling carries out on-line cooling at ACC quickly cooling device, and red temperature is 680 DEG C;
(6) stacking slow cooling: roll rear timely stacking slow cooling, stacking temperature >=500 DEG C, alignment as far as possible during stacking; 24 hours stacking time, the time of reaching can de-stacking, turnover panel, reconditioning, during de-stacking steel temperature >=100 DEG C, forbid cooling of fetching water;
(7) normalizing treatment: carry out normalizing treatment to steel plate, Heating temperature 920 DEG C, total heat-up time: 2.0min/mm, carries out water-cooled after normalizing, and steel plate red temperature is 650 DEG C.
The mechanical property of table 2 the present embodiment steel plate
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1. a high-performance marine Platform Steel, it is characterized in that, described steel plate is made up of the chemical composition of following weight percent: C:0.11% ~ 0.13%, Si:0.20% ~ 0.50%, Mn:1.45% ~ 1.55%, P≤0.012%, S≤0.003%, V:0.035% ~ 0.045%, Nb:0.025% ~ 0.030%, Ti≤0.050%, Al:0.020% ~ 0.050%, surplus is Fe and inevitable impurity; Its preparation method comprises the following steps:
(1) smelt: molten steel, first through electrosmelting, is then sent into the refining of LF refining furnace, fed more than 550 meters, Al line, white slag hold-time >=45min, lime consumption >=17kg/t steel, process and [Al] >=0.015% of skimming; Bull ladle VD stove vacuum-treat after refining, add more than SiCa block 100kg/ stove before vacuum, vacuum tightness is not more than 66Pa, vacuum hold-time >=20min;
(2) cast: after vacuum breaking, temperature is at 1545 ± 10 DEG C, the steel plate for thickness < 90mm adopts the casting of 300mm continuous caster, and superheating temperature controls at 15 ~ 40 DEG C; For the steel plate of thickness >=90mm, adopt direct casting, superheating temperature controls at 20 ~ 50 DEG C;
(3) heat: steel ingot and steel billet all perform II group of heating cycle, maximum heating temperature≤1260 DEG C, heat-up rate≤120 DEG C/h below 1000 DEG C, during temperature >=1000 DEG C, heat-up rate is not limit, and heating coefficient is 9 ~ 12min/cm;
Rolling: adopt II type controlled rolling process, first stage rolling is between 950 ~ 1100 DEG C, and this stage single pass draught is 10 ~ 25%, accumulative draft >=70%; Subordinate phase is the austenite non-recrystallize stage, start rolling temperature≤880 DEG C, finishing temperature≤820 DEG C, accumulative draft >=30%;
(4) cool: roll rear steel plate and carry out on-line cooling at ACC quickly cooling device, red temperature is 650 ~ 700 DEG C;
Stacking slow cooling: timely stacking slow cooling after steel plate rolling, stacking temperature >=500 DEG C, require during stacking that steel plate head or shoulder align as far as possible, more than 48 hours stacking time;
(5) normalizing treatment: normalizing Heating temperature is 910 ± 10 DEG C, and total heat-up time is 1.5 ~ 2.0min/mm, water-cooled after normalizing, steel plate red temperature is 650 ± 10 DEG C.
2. high-performance marine Platform Steel according to claim 1, is characterized in that, described steel plate thickness is 8 ~ 40mm.
3. a high-performance marine Platform Steel, it is characterized in that, described steel plate is made up of the chemical composition of following weight percent: 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; Its preparation method comprises the following steps:
(1) smelt: molten steel, first through electrosmelting, is then sent into the refining of LF refining furnace, fed more than 550 meters, Al line, white slag hold-time >=45min, lime consumption >=17kg/t steel, process and [Al] >=0.015% of skimming; Bull ladle VD stove vacuum-treat after refining, add more than SiCa block 100kg/ stove before vacuum, vacuum tightness is not more than 66Pa, vacuum hold-time >=20min;
(2) cast: after vacuum breaking, temperature is at 1545 ± 10 DEG C, the steel plate for thickness < 90mm adopts the casting of 300mm continuous caster, and superheating temperature controls at 15 ~ 40 DEG C; For the steel plate of thickness >=90mm, adopt direct casting, superheating temperature controls at 20 ~ 50 DEG C;
(3) heat: steel ingot and steel billet all perform II group of heating cycle, maximum heating temperature≤1260 DEG C, heat-up rate≤120 DEG C/h below 1000 DEG C, during temperature >=1000 DEG C, heat-up rate is not limit, and heating coefficient is 9 ~ 12min/cm;
Rolling: adopt II type controlled rolling process, first stage rolling is between 950 ~ 1100 DEG C, and this stage single pass draught is 10 ~ 25%, accumulative draft >=70%; Subordinate phase is the austenite non-recrystallize stage, start rolling temperature≤880 DEG C, finishing temperature≤820 DEG C, accumulative draft >=30%;
(4) cool: roll rear steel plate and carry out on-line cooling at ACC quickly cooling device, red temperature is 650 ~ 700 DEG C;
Stacking slow cooling: timely stacking slow cooling after steel plate rolling, stacking temperature >=500 DEG C, require during stacking that steel plate head or shoulder align as far as possible, more than 48 hours stacking time;
(5) normalizing treatment: normalizing Heating temperature is 910 ± 10 DEG C, and total heat-up time is 1.5 ~ 2.0min/mm, water-cooled after normalizing, steel plate red temperature is 650 ± 10 DEG C.
4. high-performance marine Platform Steel according to claim 3, is characterized in that, described steel plate thickness is 40 ~ 100mm.
5. the high-performance marine Platform Steel according to claim 1 or 3, is characterized in that, the total refining time >=60min of die casting in described step (1), the total refining time >=55min of continuous casting.
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| CN101921953A (en) * | 2010-09-08 | 2010-12-22 | 湖南华菱湘潭钢铁有限公司 | Production method of anti-corrosion and high strength ultra-thick steel plates |
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| JP2004027355A (en) * | 2001-11-14 | 2004-01-29 | Sumitomo Metal Ind Ltd | Steel member having excellent fatigue crack propagation resistance and method of producing the same |
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