CN103436811A - High-property super-thick steel plate for 500 MPa-level engineering structure and manufacturing method thereof - Google Patents
High-property super-thick steel plate for 500 MPa-level engineering structure and manufacturing method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of low alloy steels and production processes thereof, and particularly relates to a high-property super-thick steel plate for a 500 MPa-level engineering structure and a manufacturing method thereof. The high-property super-thick steel plate comprises the following components in percentage by weight: 0.020%-0.070% of C, 0.30%-0.60% of Si, 1.35%-1.60% of Mn, 0.010%-0.020% of P, S<=0.005%, 0.030%-0.060% of Nb, 0.010%-0.030% of Ti, 0.020%-0.050% of Als, 0.35%-0.45% of Cu, 0.20%-0.40% of Cr, 0.30%-0.60% of Ni, 0.05%-0.10% of Mo and the balance of Fe and inevitable impurities. In addition, the high-property super-thick steel plate disclosed by the invention meets the requirements that the welding cold cracking sensitivity coefficient Pcm is less than or equal to 0.20% and the ASTMG101-01 corrosion-resistant index I is more than 6.0. The manufacturing method disclosed by the invention adopts the low-C Cu-Ni-Cr-Mo-Nb-Ti component system, prevents the grain in an HAZ (Welding Heat Affected Zone) from being growingn because a grain refining effect achieved by compositely adding Nb-Ti is higher than the grain refining effect achieved by independently using V, enhances the obdurability of a steel plate base body and HAZ and is contributivee to enhancinge the welding line energy.
Description
Technical field
The invention belongs to the technical field of low alloy steel and production technique thereof, be specifically related to high performance ultra-thick steel plate and manufacture method thereof for a kind of 500MPa level engineering structure.
Background technology
The heavy construction structure is to all-welded structure and high-parameters future development, the safe reliability of structure is had higher requirement to obdurability, weldability and the anti-seismic performance etc. of steel, therefore, domestic and international material supplier author has proposed the concept of high-performance steel (High Performance Steel).High performance steel refer to a certain of material or several more traditional steel of performance be improved significantly steel, except possessing higher-strength, the welding property of steel, low-temperature flexibility, corrosion resistance nature, yield tensile ratio and thickness directional properties have a more substantial increase.By China's rolling shapes classification, generally claim that the plate of moderate thickness that thickness is greater than 60mm is special heavy plate.High performance ultra-thick steel plate has active demand in fields such as Highrise buildings, large span highway and railway bridge, oil ocean platforms.
Through retrieval, below some patent applications relate to high performance ultra-thick steel plate and manufacture method thereof for engineering structure, their chemical composition, process system and mechanical property are in Table 1.
The engineering structure high-performance steel particular case that the existing patent application of table 1 relates to
CN102304668A discloses a kind of manufacture method of high performance ultra-thick steel plate, carbon content 0.14%, and carbon equivalent 0.41%-0.43%, Nb, V, Ti microalloying composition system, yield strength is the 420MPa level, only meets-20 ℃ and impacts requirement.
CN101921953A discloses the production method of anti-corrosion and high strength ultra-thick steel plates, the carbon content scope is 0.05%-0.13%, except Nb, V, Ti microalloying, improves the obdurability of steel by Cu, Ni alloying, yield strength 430-445MPa, the requirement that does not reach the 500Pa level.Rear normalizing heat treatment technique is rolled in employing.
CN101684538A discloses a kind of structural steel for bridge and manufacture method thereof, adopts low C, and Cu, Ni, Cr, Mo, V composition system, do not add Nb and Ti element.The V that contains 0.02%-0.07% can separate out the carbonitride of vanadium in the postwelding process of cooling, thereby affects the welding toughness of steel.Process characteristic is Heating temperature 1150-1200 ℃, finish rolling finishing temperature 850-875 ℃, final cooling temperature 350-550 ℃.Example provides steel plate maximum ga(u)ge 20-60mm.
The steel plate of putting down in writing in above-mentioned three patent application documents, its over-all properties is poor, as poor as welding property, yield tensile ratio is high, weather resisteant is not enough, can not meet the actual demand with the high-performance steel super-thick steel plate for engineering structure at present, therefore need a kind of good combination property, process costs is low, engineering structure with short production cycle high-performance steel super-thick steel plate.
Summary of the invention
First purpose of the present invention is to provide a kind of 500MPa level engineering structure high performance ultra-thick steel plate.
Second purpose of the present invention is to provide the manufacture method of described 500MPa level engineering structure with high performance ultra-thick steel plate.
Technical scheme of the present invention is as follows:
A kind of 500MPa level engineering structure high performance ultra-thick steel plate, the composition that this steel plate comprises and weight percent thereof are: C 0.020%-0.070%, Si 0.30%-0.60%, Mn 1.35%-1.60%, P 0.010%-0.020%, S≤0.005%, Nb 0.030%-0.060%, Ti 0.010%-0.030%, Als 0.020%-0.050%, Cu 0.35%-0.45%, Cr 0.20%-0.40%, Ni 0.30%-0.60%, Mo 0.05%-0.10%; And the Fe of surplus and inevitable impurity, meet in addition welding cold crack sensitivity FACTOR P cm≤0.20%, ASTM G101-01 corrosion resistance index I>6.0.
As preferably, the composition that steel plate of the present invention comprises and weight percent thereof are: C 0.020%-0.060%, Si 0.30%-0.50%, Mn 1.40%-1.60%, P 0.010%-0.020%, S≤0.005%, Nb 0.040%-0.060%, Ti 0.015%-0.030%, Als 0.020%-0.050%, Cu 0.35%-0.45%, Cr 0.20%-0.40%, Ni 0.40%-0.60%, Mo 0.05%-0.10%; And the Fe of surplus and inevitable impurity.
As further preferred, the composition that steel plate of the present invention comprises and weight percent thereof are: C 0.030%-0.050%, Si 0.30%-0.40%, Mn 1.40%-1.50%, P 0.010%-0.015%, S≤0.002%, Nb 0.040%-0.050%, Ti 0.015%-0.020%, Als 0.020%-0.030%, Cu 0.35%-0.40%, Cr 0.25%-0.35%, Ni 0.45%-0.55%, Mo 0.07%-0.10%; And the Fe of surplus and inevitable impurity.
Wherein, Pcm=C+ (Mn+Cu+Cr)/20+Mo/15+V/10+Si/30+Ni/60+5/B;
I=26.01(%Cu)+3.88(Ni%)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.1(%Ni)(%P)-33.39(%Cu)
2。
Steel plate thickness of the present invention is 60mm-100mm.
The reason that adopts mentioned component and weight percent thereof in the present invention below is described in detail in detail.
C affects very large on intensity, toughness, welding property.C generally serves as the strengthening constituent element in steel, if dissolve in matrix, plays solution strengthening effect, increases C content and can promote to form carbide and martensite.The C content 0.020%-0.070% that the present invention is definite.
Si is the deoxidation in steel making bioelement, and certain solution strengthening effect is also arranged, and Si can also improve the weathering resistance of steel, but the too high weldability to steel and cold formability produce detrimentally affect.The Si content 0.30%-0.60% that the present invention is definite.
Mn is also the bioelement of deoxidation in steel making, and the Mn cost of alloy is cheap, to carry high-intensity effective element, in addition, Mn is the element that enlarges austenitic area, can reduce the transition temperature of supercooled austenite, to control one of quite effective element in structure of steel, but the Mn too high levels, the heavy slab center segregation can increase, and reduces the performance ununiformity of Plate Steel thickness aspect.The Mn content 1.35%-1.60% that the present invention is definite.
P can significantly improve the atmospheric corrosion resistance of steel, and can, by the segregation of P, improve the deficiency of soft steel intergranular intensity.But P is strong segregation element in steel, also can seriously reduce the low-temperature flexibility of steel, totally unfavorable to the super-thick steel plate structure property.P content of the present invention is not more than 0.020%, but non-vanishing.
S is detrimental impurity element in steel, and too high levels can worsen toughness plasticity, cold formability and the weldability of steel, can also cause that steel plate indulges lateral performance difference, and the super-thick steel plate thickness directional properties deteriorates significantly.Therefore answer S content in the reduce steel.S content of the present invention is not more than 0.005%.
Nb is strong carbonitride forming element, and effectively the austenitic recrystallize of delayed deformation, stop Austenite Grain Growth, improves austenite recrystallization temperature, crystal grain thinning, the obdurability of raising steel.By separating out carbonitride in process of cooling after rolling, produce the comprehensive mechanical performance that refined crystalline strengthening and precipitation strength are used for improving steel.Nb content 0.030%-0.060% of the present invention.
Ti is a kind of strong carbonitride forming element, and its carbonitride has higher fusing point, and during to heating, Austenite Grain Growth has inhibition.The remarkable grain growth of tissue welding heat affected zone of TiN or TiC particle in steel, thus the mechanical property of its welding joint improved.Ti content 0.010%-0.030% in steel of the present invention.
Al is the main deoxidant element of steel, and Al content is greater than 0.05%, will cause the oxide inclusion of Al to increase, and reduces the purity of steel, is unfavorable for toughness and the weather resistance of steel, and the AlN fusing point is higher, the Austenite Grain Growth in the time of can stoping heating of plate blank.Als content 0.020%-0.050% of the present invention.
Cu can improve the hardening capacity of steel, mainly plays solid solution and precipitation strength effect in steel, can also pass through the Cu-Cr-Ni suitable proportion, improves the weather resistance of steel, is conducive in addition obtain good low-temperature flexibility, increases the fatigue crack extended capability of steel simultaneously.Cu content is less than 0.35%, and its precipitation strength effect is not obvious, while being greater than 0.45%, can affect welding heat influence area toughness.Cu content 0.35%-0.45% of the present invention.
Cr improves the hardening capacity element, can suppress polygonal ferrite and pearlitic formation, promotes bainite or martensitic transformation, thereby the strong hardness of steel is increased, but the too high toughness that will affect steel of Cr, and cause temper brittleness.Cr content 0.20%-0.40% of the present invention.
Ni can improve hardening capacity, has certain strengthening effect, can also improve significantly the low-temperature flexibility of steel, makes mother metal and Low Temperature Impact Toughness of Heat-affected Zone increase substantially.Ni also significantly improves the weather resistance of steel, especially sea water corrosion resistant.The interpolation of Ni mainly stops cupric steel billet check crack tendency when heating and hot rolling.Add Ni in Copper Bearing Steel, contribute to suppress the decrepitation in the Copper Bearing Steel hot procedure, improve the high temperature creep property of Copper Bearing Steel.Ni content 0.30%-0.60% of the present invention.
Mo can increase hardening capacity, improve the intensity of steel, and can effectively postpone the transformation of ferrite and pearlite, thereby promote the acquisition of bainite, make steel obtain acicular structure more completely in wider speed of cooling scope, but too high Mo can make the low-temperature flexibility of steel significantly worsen, also can when welding, form too much martensite, cause welding joint fragility to increase.Mo is the noble metal element simultaneously.Mo content 0.05%-0.10% of the present invention.
The manufacture method of high performance ultra-thick steel plate for 500MPa level engineering structure of the present invention, comprise steel making working procedure and steel rolling process, processing step is followed successively by: hot metal pretreatment, converter smelting, LF/RH associating refining, continuous casting, strand slow cooling, heating of plate blank, rolling, cooling, check check, warehouse-in; Adopt Clean Steel to smelt continuous casting process, utilize hot metal pretreatment, top and bottom combined blown converter, LF/RH, each metallurgical equipment function of tundish, whole process is controlled S, H, N detrimental impurity content; Come into operation solidification end dynamic soft-reduction, strand retarded cooling process technical measures of continuous caster guarantees the strand macrostructure.
The manufacture method of high performance ultra-thick steel plate for 500MPa level engineering structure of the present invention, concrete steps are as follows:
Steel making working procedure:
Molten iron adopts desulfurization pre-treatment, top and bottom combined blown converter smelting;
In described LF/RH associating refining procedure, LF molten steel departures [S]≤0.0050%, the treatment time 10-15min that RH vacuum tightness 100Pa is following, the RH molten steel [H]≤0.0002% that sets off, the RH molten steel [S]≤0.0020% that sets off;
The continuous casting tundish adopts alkaline covering agent, and crystallizer adopts the low-carbon microalloy covering slag, whole process using ladle stamp, steel ladle protective sleeve, middle bag submerged nozzle protection cast, and the control casting process increases N and is not more than 0.0003%;
Strand after the continuous caster cutting enters the burial pit slow cooling, and strand enters to cheat temperature 500-900 ℃, and slow cooling time 48h-72h, go out to cheat temperature 200-300 ℃;
Steel rolling process: adopt online TMCP Technology, after rolling without thermal treatment;
For guaranteeing the abundant solid solution of alloying element, prevent that austenite crystal from too growing up, slab heating temperature is controlled at 1200-1250 ℃;
Adopt two stage rolling, roughing start rolling temperature scope 1050-1150 ℃, complete the first stage rolling in the austenite recrystallization temperature scope, accumulative total draught 60-65%; Subordinate phase finish rolling rolling in austenite non-recrystallization temperature range, finish rolling start rolling temperature 850-920 ℃, finishing temperature 800-830 ℃;
In described refrigerating work procedure, adopt the quick water-cooled of MULPIC, speed of cooling 5-15 ℃/S, final cooling temperature 200-350 ℃.
As preferably, in steel making working procedure, strand enters to cheat temperature 700-800 ℃, and slow cooling time 60h-72h, go out to cheat temperature 230-300 ℃.
7-10 ℃/S of MULPIC cooling by water speed in steel rolling process, final cooling temperature 250-350 ℃.
Beneficial effect of the present invention is:
1. the present invention adopts low C, Cu-Ni-Cr-Mo-Nb-Ti composition system, Nb-Ti is compound, and interpolation than has stronger Grain refinement with V separately, prevents welded heat affecting zone (HAZ) grain growth, improve steel matrix and HAZ obdurability, also contribute to improve weld heat input.Under the super-thick steel plate higher-strength rank (500MPa level) of thickness 60～100mm that the present invention manufactures, yield tensile ratio is not more than 0.85, Plate Welding cold crack index low (Pcm≤0.20), weathering resistance good (I >=6.0), thickness directional properties high (relative reduction in area Ψ z reaches the Z35 level), more than steel plate 1/2 thickness-40 ℃ vertical summer reaches 150J than V-type ballistic work.The present invention utilizes described manufacture method, obtains the better super-thick steel plate of over-all properties, meets the fields such as Highrise buildings, bridge, ocean platform to the requirement of special heavy plate properties.This point is that in background technology, any one documents institute is inaccessiable.
2, the present invention adopts Clean Steel to smelt the continuous casting process technology, gives full play to each metallurgical equipment functions such as hot metal pretreatment, top and bottom combined blown converter, LF/RH, tundish, and whole process is controlled the detrimental impurity content such as S, H, N.In a word, the technology measures such as control, come into operation by Cleanliness of Molten Steel dynamic soft reduction of continuous casting machine, strand slow cooling guarantee cleanliness factor and the strand macrostructure of steel, [S]≤0.0020%, [N]≤0.0030%, [H]≤0.0002%, center segregation C≤1.5.
3, slab heating temperature of the present invention is controlled between 1200-1250 ℃, adopts two stage rolling, and roughing start rolling temperature scope 1050-1150 ℃, complete the first stage rolling in the austenite recrystallization temperature scope, and accumulative total is depressed 60-65%; Finish rolling start rolling temperature 850-920 ℃, finishing temperature 800-830 ℃.Adopt the quick water-cooled of MULPIC, speed of cooling 5-15 ℃/S, final cooling temperature 200-350 ℃.Aforementioned strand is through this heating, roughing, finish rolling, process for cooling, obtains that crystal grain is tiny, the acicular ferrite structure of homogeneous microstructure, thereby realizes the performance index of design.
4, the present invention adopts online TMCP technique, and without off-line thermal treatment, process costs is low, with short production cycle.
In a word, the present invention considers the actual demand of current engineering structure with the high-performance steel super-thick steel plate, designed and manufactured that the easily welding of a kind of 500MPa level, high tenacity, low yield strength ratio, thickness directional properties are good, 1/2 thickness good combination property, there is the super-thick steel plate of atmospheric corrosion resistance, possessed outstanding substantive distinguishing features and significant progressive.
The accompanying drawing explanation
Fig. 1 is the metallographic structure on the nearly surface of the steel plate of thickness 64mm described in embodiment 1.
Fig. 2 is the metallographic structure at the center of thickness 64mm steel plate described in embodiment 1.
Fig. 3 is the metallographic structure on the nearly surface of the steel plate of thickness 80mm described in embodiment 2.
Fig. 4 is the metallographic structure at the center of thickness 80mm steel plate described in embodiment 2.
Embodiment
Below by specific embodiment, technical scheme of the present invention is described in detail.
Implement the present invention in 210 tons of converter steelmaking factories and 4300mm Wide and Thick Slab factory.
The present invention adopts low C, Cu-Ni-Cr-Mo-Nb-Ti composition system, the composition that this ladle contains and weight percent thereof are: C 0.020%-0.070%, Si 0.30%-0.60%, Mn 1.35%-1.60%, P 0.010%-0.020%, S≤0.005%, Nb 0.030%-0.060%, Ti 0.010%-0.030%, Als 0.020%-0.050%, Cu 0.35%-0.45%, Cr 0.20%-0.40%, Ni 0.30%-0.60%, Mo 0.05%-0.10%; And the Fe of surplus and inevitable impurity, need in addition to meet welding cold crack sensitivity FACTOR P cm≤0.20%, ASTM G101-01 corrosion resistance index I>6.0.The concrete composition of implementing is in Table 2.
Table 2 smelting component, wt%
The Pcm=0.17 that embodiment 1 calculates, I=6.56; The Pcm=0.19 that embodiment 2 calculates, I=6.78.
The technical process of Plate Production of the present invention is: hot metal pretreatment → converter smelting → LF/RH refining → continuous casting → strand slow cooling → heating of plate blank → rolling → cooling → inspection, check → warehouse-in.
Steel making working procedure: adopt Clean Steel to smelt continuous casting process.Molten iron adopts desulfurization pre-treatment, top and bottom combined blown converter smelting.LF molten steel departures [S]≤0.005%, treatment time >=10min that RH vacuum tightness 100Pa is following, the RH molten steel [H]≤0.0002% that sets off, the RH molten steel [S]≤0.0020% that sets off.The continuous casting tundish adopts alkaline covering agent, and crystallizer adopts the low-carbon microalloy covering slag, whole process using ladle stamp, steel ladle protective sleeve, middle bag submerged nozzle protection cast, and the control casting process increases N and is not more than 0.0003%.The dynamic soft-reduction that comes into operation, strand enters the burial pit slow cooling, and strand enters to cheat temperature 500-900 ℃, and slow cooling time 48-72h, go out to cheat temperature 200-300 ℃.The concrete process for making parameter of implementing is in Table 3.
Table 3 process for making parameter
Steel rolling process: slab heating temperature is controlled between 1200-1250 ℃.Adopt two stage rolling, roughing start rolling temperature scope 1050-1150 ℃, complete the first stage rolling in the austenite recrystallization temperature scope, accumulative total draught 60-65%; Finish rolling start rolling temperature 850-920 ℃, finishing temperature 800-830 ℃.Adopt the quick water-cooled of MULPIC, speed of cooling 5-15 ℃/S, final cooling temperature 200-350 ℃.The concrete process for making parameter of implementing is in Table 4.
Table 4 steel rolling process parameter
The concrete steel plate assay in kind of implementing is in Table 5.
Table 5 steel plate assay in kind
Claims (8)
1. a 500MPa level engineering structure high performance ultra-thick steel plate, the composition that this steel plate comprises and weight percent thereof are: C 0.020%-0.070%, Si 0.30%-0.60%, Mn 1.35%-1.60%, P 0.010%-0.020%, S≤0.005%, Nb 0.030%-0.060%, Ti 0.010%-0.030%, Als 0.020%-0.050%, Cu 0.35%-0.45%, Cr 0.20%-0.40%, Ni 0.30%-0.60%, Mo 0.05%-0.10%; And the Fe of surplus and inevitable impurity, meet in addition welding cold crack sensitivity FACTOR P cm≤0.20%, ASTM G101-01 corrosion resistance index I>6.0.
2. 500MPa level engineering structure high performance ultra-thick steel plate according to claim 1, the composition comprised and weight percent thereof are: C 0.020%-0.060%, Si 0.30%-0.50%, Mn 1.40%-1.60%, P 0.010%-0.020%, S≤0.005%, Nb 0.040%-0.060%, Ti 0.015%-0.030%, Als 0.020%-0.050%, Cu 0.35%-0.45%, Cr 0.20%-0.40%, Ni 0.40%-0.60%, Mo 0.05%-0.10%; And the Fe of surplus and inevitable impurity.
3. 500MPa level engineering structure high performance ultra-thick steel plate according to claim 2, the composition comprised and weight percent thereof are: C 0.030%-0.050%, Si 0.30%-0.40%, Mn 1.40%-1.50%, P 0.010%-0.015%, S≤0.002%, Nb 0.040%-0.050%, Ti 0.015%-0.020%, Als 0.020%-0.030%, Cu 0.35%-0.40%, Cr 0.25%-0.35%, Ni 0.45%-0.55%, Mo 0.07%-0.10%; And the Fe of surplus and inevitable impurity.
4. according to claim 1 or 2 or 3 described 500MPa level engineering structure high performance ultra-thick steel plates, described steel plate thickness is 60mm-100mm.
5. the manufacture method of high performance ultra-thick steel plate for 500MPa level engineering structure as claimed in claim 1, comprise steel making working procedure and steel rolling process, processing step is followed successively by: hot metal pretreatment, converter smelting, LF/RH associating refining, continuous casting, strand slow cooling, heating of plate blank, rolling, cooling, check check, warehouse-in; Adopt Clean Steel to smelt continuous casting process, utilize hot metal pretreatment, top and bottom combined blown converter, LF/RH, each metallurgical equipment function of tundish, whole process is controlled S, H, N detrimental impurity content; Come into operation solidification end dynamic soft-reduction, strand retarded cooling process technical measures of continuous caster guarantees the strand macrostructure.
6. the manufacture method of high performance ultra-thick steel plate for 500MPa level engineering structure according to claim 5, concrete steps are as follows:
Steel making working procedure:
Molten iron adopts desulfurization pre-treatment, top and bottom combined blown converter smelting;
In described LF/RH associating refining procedure, LF molten steel departures [S]≤0.0050%, the treatment time 10-15min that RH vacuum tightness 100Pa is following, the RH molten steel [H]≤0.0002% that sets off, the RH molten steel [S]≤0.0020% that sets off;
The continuous casting tundish adopts alkaline covering agent, and crystallizer adopts the low-carbon microalloy covering slag, whole process using ladle stamp, steel ladle protective sleeve, middle bag submerged nozzle protection cast, and the control casting process increases N and is not more than 0.0003%;
Strand after the continuous caster cutting enters the burial pit slow cooling, and strand enters to cheat temperature 500-900 ℃, and slow cooling time 48h-72h, go out to cheat temperature 200-300 ℃;
Steel rolling process: adopt online TMCP Technology, after rolling without thermal treatment;
For guaranteeing the abundant solid solution of alloying element, prevent that austenite crystal from too growing up, slab heating temperature is controlled at 1200-1250 ℃;
Adopt two stage rolling, roughing start rolling temperature scope 1050-1150 ℃, complete the first stage rolling in the austenite recrystallization temperature scope, accumulative total draught 60-65%; Subordinate phase finish rolling rolling in austenite non-recrystallization temperature range, finish rolling start rolling temperature 850-920 ℃, finishing temperature 800-830 ℃;
In described refrigerating work procedure, adopt the quick water-cooled of MULPIC, speed of cooling 5-15 ℃/S, final cooling temperature 200-350 ℃.
7. the manufacture method of high performance ultra-thick steel plate for 500MPa level engineering structure according to claim 6, is characterized in that, in steel making working procedure, strand enters to cheat temperature 700-800 ℃, and slow cooling time 60h-72h, go out to cheat temperature 230-300 ℃.
8. the manufacture method of high performance ultra-thick steel plate for 500MPa level engineering structure according to claim 6, is characterized in that 7-10 ℃/S of MULPIC cooling by water speed in steel rolling process, final cooling temperature 250-350 ℃.
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