CN102732789A - High-performance ocean platform steel and its production method - Google Patents
High-performance ocean platform steel and its production method Download PDFInfo
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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 with steel and working method thereof.
Background technology
In China's sea hydrocarbon resources exploitation, the oceanographic engineering equipment manufacture is the strategic industry that equipment is provided for ocean exploitation.Expecting the year two thousand twenty global ocean engineer equipment market investment will be above 1,200 hundred million yuan, and wherein platform and oceanographic engineering boats and ships are invested about 70,000,000,000 yuan, and the deep water equipment investment accounts for more than 45%.Projects such as Li Gulf, Li Shui, the huge great waves of kind Yu, victory Bao Wang; Be CNOOC's South 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 independent development design, this type of with steel demand in every year more than 100,000 tons.Present ocean platform all compares less with performances such as hardness of steel and low-temperature flexibilities, influenced the use of this type of steel plate.
Summary of the invention
To the problems referred to above, the object of the present invention is to provide a kind ofly to have good obdurability and the good 8 ~ 100mm high-performance marine platform of welding property is used steel.
Simultaneously, the present invention also aims to provide the working method of a kind of 8 ~ 100mm high-performance marine platform with steel.
To achieve these goals, technical program of the present invention lies in having adopted a kind of high-performance marine platform to use steel, form by the chemical ingredients 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 unavoidable impurities.Described steel plate thickness is 8 ~ 40mm.
A kind of high-performance marine platform is used steel, is made up of the chemical ingredients 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 are Fe and unavoidable impurities.Described steel plate thickness is 40 ~ 100mm.
The effect of each element in this steel grade is:
Carbon (C): carbon content increases in the steel, and yield-point raises with tensile strength, but plasticity and impact reduction, and can influence the welding property and the toughness (aging performance etc.) of steel.Therefore to two kinds of thickness ranges, stipulated 8～40mm, C:0.11% ~ 0.13%; 40～100mm, C:0.10% ~ 0.12%.
Silicon (Si): as reductive agent and reductor, Si also can play the solution strengthening effect simultaneously in steelmaking process, but surpasses at 0.5% o'clock, can cause the toughness of steel to descend, and reduces the welding property of steel.
Manganese (Mn): manganese is with low cost, can increase toughness, intensity and the hardness of steel, improves the hardening capacity of steel, improves the hot workability of steel; The manganese amount is too high, is prone to center segregation for big thickness steel plate.In this steel grade, manganese mainly act as raising intensity.To two kinds of thickness ranges, stipulated 8～40mm, Mn:1.45% ~ 1.55%; 40～100mm, Mn:1.50% ~ 1.60%.
Phosphorus (P), sulphur (S): generally speaking, p and s all is a harmful element in the steel, increases the fragility of steel.Phosphorus degenerates welding property, reduces plasticity, and cold-bending property is degenerated; Sulphur reduces the ductility and the toughness of steel, is forging and causing when rolling crackle; Therefore should reduce the content of p and s in steel as far as possible.For the platform steel,, therefore when design mix, just stipulate owing to standard requires strictness more to phosphorus (P), sulphur (S): P≤0.012%, S≤0.003%,
Niobium (Nb): in heating, in the operation of rolling, the precipitated phase that niobium element and carbon, nitrogen form is at the hot stage stable existence or be dissolved in microalloy element in the austenite at the solid solution effect of dragging of hot stage, thus the alligatoring of obstruction recrystal grain.The tiny precipitated phase that hot stage exists is pinned at crystal boundary, and crystal boundary mobile had tangible inhibition; Crystal boundary moves with second when particle is completed a business transaction mutually, this interaction meeting absorption interface energy, thus postpone moving of 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 just can be satisfied, and has added many and can cause waste.
Vanadium (V): vanadium mainly plays solution strengthening and precipitation strength effect in steel, strengthen matrix, improves the intensity of steel plate.Because other alloys are cheap relatively for the vanadium price, just can improve intensity through adding an amount of vanadium, need not add expensive more alloy, as: molybdenum (Mo), titanium (Ti) etc.General vanadium adds in right amount to be increased according to steel plate thickness is different, and less than the 40mm steel plate, add-on is 0.035% ~ 0.045%; Greater than the 40mm steel plate, add-on is 0.070% ~ 0.075% just can meet the demands.
Titanium (Ti): steel in use often will weld, and welding joint is its weak link, particularly heat affected zone, and is the easiest in this destruction.In steel, add the titanium of trace, can impurity such as oxygen, nitrogen, sulphur etc. be fixed up, thereby improve the weldability of steel; Secondly, because the effect of its microcosmic particle, for example TiN not solvability at high temperature can stop the alligatoring of heat affected zone crystal grain, improves the toughness of heat affected zone, thereby improves the welding property of steel.Generally because slab crystal grain is bigger, adds an amount of titanium and can improve welding property and actual effect performance, add-on is no more than 0.050%, and (8～80mm) generally do not add thin plate.
Aluminium (Al): the nitrogen agent is decided in the deoxidation during as steel-making; Add a spot of aluminium in the steel, but crystal grain thinning improves impelling strength when low temperature, has reduced the brittle transition temperature of steel.The Al that general steel grade adds 0.020%-0.050% gets final product.
Simultaneously, technical program of the present invention also lies in adopting the working method of a kind of high-performance marine platform, may further comprise the steps with steel:
(1) smelt: molten steel is sent into the refining of LF refining furnace then earlier through electrosmelting, feeds the Al line more than 550 meters, white slag hold-time >=45min, lime consumption >=17kg/t steel, the process and [Al] >=0.015% of skimming; Bull ladle VD stove vacuum-treat after refining finishes; Add before the vacuum more than the SiCa piece 100kg/ stove, vacuum tightness is not more than 66Pa, destroys vacuum during vacuum hold-time >=20min; Reduce nonmetallic inclusionsin steel, harmful element content to greatest extent, guarantee the purity of molten steel;
(2) casting: temperature is at 1545 ± 10 ℃ after the vacuum breaking, and for the steel plate employing 300mm continuous caster casting of thickness＜90mm, superheating temperature is controlled at 15 ~ 40 ℃; For the steel plate of thickness >=90mm, adopt direct casting, superheating temperature is controlled at 20 ~ 50 ℃;
(3) heating: steel ingot and steel billet are all carried out II group heating cycle, maximum heating temperature≤1260 ℃, and guaranteeing that ingot blank passes through burns evenly, and in heat-up rate≤120 below 1000 ℃ ℃/h, heat-up rate is not limit during temperature>=1000 ℃, and heating coefficient is 9 ~ 12min/cm;
(4) rolling: adopt II type controlled rolling process, the fs is rolling between 950 ~ 1100 ℃, and this stage single pass draught is 10 ~ 25%, and accumulative total draft>=70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, start rolling temperature≤880 ℃, finishing temperature≤820 ℃; In this stage, austenite crystal is elongated, and forms high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation; Thereby increased ferritic nucleation site; Refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative total draft>=30%;
(5) cooling: roll the back steel plate and carry out online cooling at the ACC quickly cooling device, returning red temperature is 650 ~ 700 ℃;
(6) stacking slow cooling: timely stacking slow cooling behind the steel plate rolling, stacking temperature >=500 ℃ require steel plate head or shoulder to align as far as possible during stacking, and the stacking time is more than 48 hours;
(7) normalizing treatment: the steel plate normalizing will select for use the good heat treatment furnace of the working of a furnace to handle, and reduces roll marks, and normalizing is abundant, and the normalizing Heating temperature is 910 ± 10 ℃, and be 1.5 ~ 2.0min/mm total heat-up time, water-cooled after the normalizing, and it is 650 ± 10 ℃ that steel plate returns red temperature.
The total refining time >=60min of die casting described in the step (1), the total refining time >=55min of continuous casting.
To the development of Yu Haiyang with the platform steel, through formulating strict quality planning and development technology scheme, each link during control is produced is guaranteed quality product.
(1) technological process of production
Electrosmelting → LF stove refining → VD vacuum-treat → continuous casting (or die casting) → heating → controlled rolling → ACC controlled chilling → stacking → normalizing → service check → warehouse-in.
(2) composition design
In composition design, adopt the mentality of designing of low-carbon (LC), high microalloying, solved the requirement of carbon, manganese segregation problem and HS, high impact toughness; Under the condition of low-carbon (LC), low-carbon-equivalent, guarantee steel plate hardening capacity, have favorable tissue, over-all properties and welding property.
(3) plate surface quality requirement
Adopt the secondary rolling mode of production of becoming a useful person to make steel surface bright and clean, do not have dirt, wrinkle, phosphorus skin and rust staining, can also reach the requirement that steel plate does not allow soldering, optimize technology, control plate shape and surface quality well.
(4) steel plate tissue
Through reasonable heat treating regime, obtain ferritic and pearlitic structure, surface of steel plate bainite layer is few, and grain fineness number is more than 8 grades, and the banded structure grade is lower than 1.5 grades of requirements.
The present invention has the following advantages: 1. good mechanical performance, and the thin specification performance index of ys and tensile strength has big surplus capacity; 2. low-temperature impact work is high, and-20 ℃ of ballistic works are more than 100 Jiao; 3. Z to performance (relative reduction in area %) about 50%; 4. carbon equivalent Ceq≤0.41% welds sensitivity coefficient Pcm≤0.21%; 5. the steel plate maximum ga(u)ge can reach 100mm.
Embodiment
Embodiment 1
Greater than 90mm, the actual constituent of steel plate (by weight percentage) is the ocean platform of present embodiment: C:0.10%, Si:0.28%, Mn:1.56% with the thickness of steel; P:0.010%, S:0.001%, Al:0.037%; Nb:0.037%, V:0.075%, Ti:0.045%; Surplus is Fe and unavoidable impurities, and Ceq is 0.40%, and Pcm is 0.20%.
The working method of steel plate of the present invention is following:
(1) smelt: molten steel when contracting out steel greatly, adds 1 ton of alloy earlier through electrosmelting, comprising reductor Si-Mn, avoids the Molten Steel over-oxidation degree to strengthen, and when contracting out steel greatly, P must not allow to see the slag tapping less than 0.008%; Send into the refining of LF refining furnace, and feed 650 meters on Al line, lime 1720kg; Si-Fe powder 123kg, white slag keeps 55min, the vacuum-treat of VD stove; Add SiCa piece 130kg/ stove before the vacuum, vacuum tightness 66Pa destroys vacuum during hold-time 23min; Solve molten steel and depended merely on the deoxidation of Al line, the higher phenomenon of nonmetallic inclusionsin steel content, guaranteed the purity of steel;
(2) casting: after the vacuum breaking, adopt 33.4T slab ingot mould to cast then, guarantee that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person, 12 bags/of carbonization rice husk add-ons, superheating temperature is controlled at 30 ℃;
(3) heating: press II and organize heating cycle, 1260 ℃ of maximum heating temperatures guarantee that steel ingot grills thoroughly evenly, and at 120 ℃/h of heat-up rate below 1000 ℃, temperature >=1000 a ℃ heat-up rate is not limit, heating coefficient 9min/cm;
(4) rolling: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and rolling temperature is between 1000 ℃, and this stage single pass draught is 15%, and accumulative total draft 80% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, and start rolling temperature is 880 ℃, and finishing temperature is 820 ℃; In this stage, austenite crystal is elongated, and forms high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation; Thereby increased ferritic nucleation site; Refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative total draft 50%;
(5) cooling: the steel plate after rolling carries out online cooling at the ACC quickly cooling device, and returning red temperature is 680 ℃;
(6) stacking slow cooling: roll back stacking slow cooling in time, stacking temperature >=500 ℃, 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 ℃, and the cooling of forbidding to fetch water;
(7) normalizing treatment: steel plate is carried out normalizing treatment, 920 ℃ of Heating temperatures, total heat-up time: 2.0min/mm carries out water-cooled after the normalizing, and it is 650 ℃ that steel plate returns red temperature.
The mechanical property of table 1 present embodiment steel plate
Embodiment 2
It is≤40mm that the actual constituent of steel plate (by weight percentage) is: C:0.12%, Si:0.27% that the ocean platform of present embodiment uses the thickness of steel; Mn:1.48%, P:0.009%, S:0.001%; Al:0.038%, Nb:0.027%, V:0.038%; Surplus is Fe and unavoidable impurities, and Ceq is 0.38%, and Pcm is 0.21%.
The working method of steel plate of the present invention is following:
(1) smelt: molten steel when contracting out steel greatly, adds 1 ton of alloy earlier through electrosmelting, comprising reductor Si-Mn, avoids the Molten Steel over-oxidation degree to strengthen, and when contracting out steel greatly, P must not allow to see the slag tapping less than 0.008%; Send into the refining of LF refining furnace, and feed 650 meters on Al line, lime 1720kg; Si-Fe powder 123kg, white slag keeps 55min, the vacuum-treat of VD stove; Add SiCa piece 130kg/ stove before the vacuum, vacuum tightness 66Pa destroys vacuum during hold-time 23min; Solve molten steel and depended merely on the deoxidation of Al line, the higher phenomenon of nonmetallic inclusionsin steel content, guaranteed the purity of steel;
(2) casting: after the vacuum breaking, adopt continuous casting then and cast, cast steel billet specification is 300mm * 2000mm, and superheating temperature is controlled at 30 ℃;
(3) heating: press II group heating cycle, 1260 ℃ of maximum heating temperatures, guaranteeing that ingot blank passes through burns evenly, and at 100 ℃/h of heat-up rate below 1000 ℃, heat-up rate is not limit during temperature >=1000 ℃, and heating coefficient is 12min/cm;
(4) rolling: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and rolling temperature is between 1100 ℃, and this stage single pass draught is 15%, and accumulative total draft 80% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, and start rolling temperature is 880 ℃, and finishing temperature is 820 ℃; In this stage, austenite crystal is elongated, and forms high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation; Thereby increased ferritic nucleation site; Refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative total draft 50%;
(5) cooling: the steel plate after rolling carries out online cooling at the ACC quickly cooling device, and returning red temperature is 680 ℃;
(6) stacking slow cooling: roll back stacking slow cooling in time, stacking temperature >=500 ℃, 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 ℃, and the cooling of forbidding to fetch water;
(7) normalizing treatment: steel plate is carried out normalizing treatment, 920 ℃ of Heating temperatures, total heat-up time: 2.0min/mm carries out water-cooled after the normalizing, and it is 650 ℃ that steel plate returns red temperature.
The mechanical property of table 2 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 the present invention is specified with reference to the foregoing description; Those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention; And replace any modification or the part that do not break away from the spirit and scope of the present invention, and it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. a high-performance marine platform is used steel, it is characterized in that, described steel plate is made up of the chemical ingredients 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 unavoidable impurities.
2. high-performance marine platform according to claim 1 is used steel, it is characterized in that, described steel plate thickness is 8 ~ 40mm.
3. a high-performance marine platform is used steel, it is characterized in that, described steel plate is made up of the chemical ingredients 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 unavoidable impurities.
4. high-performance marine platform according to claim 3 is used steel, it is characterized in that, described steel plate thickness is 40 ~ 100mm.
One kind like claim 1 or 3 described high-performance marine platforms with the working method of steel, it is characterized in that, may further comprise the steps:
(1) smelt: molten steel is sent into the refining of LF refining furnace then earlier through electrosmelting, feeds the Al line more than 550 meters, white slag hold-time >=45min, lime consumption >=17kg/t steel, the process and [Al] >=0.015% of skimming; Bull ladle VD stove vacuum-treat after refining finishes adds before the vacuum more than the SiCa piece 100kg/ stove, and vacuum tightness is not more than 66Pa, vacuum hold-time >=20min;
(2) casting: temperature is at 1545 ± 10 ℃ after the vacuum breaking, and for the steel plate employing 300mm continuous caster casting of thickness＜90mm, superheating temperature is controlled at 15 ~ 40 ℃; For the steel plate of thickness >=90mm, adopt direct casting, superheating temperature is controlled at 20 ~ 50 ℃;
(3) heating: steel ingot and steel billet are all carried out II group heating cycle, maximum heating temperature≤1260 ℃, and in heat-up rate≤120 below 1000 ℃ ℃/h, heat-up rate is not limit during temperature>=1000 ℃, and heating coefficient is 9 ~ 12min/cm;
(4) rolling: adopt II type controlled rolling process, the fs is rolling between 950 ~ 1100 ℃, and this stage single pass draught is 10 ~ 25%, accumulative total draft>=70%; Subordinate phase is the non-recrystallize stage of austenite, start rolling temperature≤880 ℃, finishing temperature≤820 ℃, accumulative total draft>=30%;
(5) cooling: roll the back steel plate and carry out online cooling at the ACC quickly cooling device, returning red temperature is 650 ~ 700 ℃;
(6) stacking slow cooling: timely stacking slow cooling behind the steel plate rolling, stacking temperature >=500 ℃ require steel plate head or shoulder to align as far as possible during stacking, and the stacking time is more than 48 hours;
(7) normalizing treatment: the normalizing Heating temperature is 910 ± 10 ℃, and be 1.5 ~ 2.0min/mm total heat-up time, water-cooled after the normalizing, and it is 650 ± 10 ℃ that steel plate returns red temperature.
6. high-performance marine platform according to claim 5 is characterized in that with the working method of steel, the total refining time >=60min of die casting in the described step (1), the total refining time >=55min of continuous casting.
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