CN103436811B - 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 a kind of 500MPa level engineering structure high performance ultra-thick steel plate and manufacture method thereof.
Background technology
Heavy construction structure is to all-welded structure and high-parameters future development, the safe reliability of structure is had higher requirement to the obdurability of steel, weldability and anti-seismic performance etc., therefore, domestic and international material supplier author proposes 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, the general plate of moderate thickness claiming thickness to be greater than 60mm is special heavy plate.High performance ultra-thick steel plate has active demand in fields such as Highrise buildings, long-span highway and railroad bridge, oil ocean platforms.
Through retrieval, some patent applications relate to engineering structure high performance ultra-thick steel plate and manufacture method thereof below, and their chemical composition, process system and mechanical property is 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%, carbon equivalent 0.41%-0.43%, Nb, V, Ti microalloying ingredient system, and yield strength is 420MPa level, only meets-20 DEG C and impacts requirement.
CN101921953A discloses the production method of anti-corrosion and high strength ultra-thick steel plates, 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, does not reach the requirement of 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, Cu, Ni, Cr, Mo, V component system, does not add Nb and Ti element.V containing 0.02%-0.07%, can separate out the carbonitride of vanadium in postwelding process of cooling, thus affects the welding toughness of steel.Process characteristic is Heating temperature 1150-1200 DEG C, finish rolling finishing temperature 850-875 DEG C, final cooling temperature 350-550 DEG C.Example provides steel plate maximum ga(u)ge 20-60mm.
The steel plate recorded in above-mentioned three patent application documents, its over-all properties is poor, as poor in welding property, yield tensile ratio is high, weather resisteant is not enough, can not meet at present for the actual demand of engineering structure high-performance steel super-thick steel plate, therefore a kind of good combination property is needed, process costs is low, engineering structure high-performance steel super-thick steel plate with short production cycle.
Summary of the invention
First object of the present invention is to provide a kind of 500MPa level engineering structure high performance ultra-thick steel plate.
Second object of the present invention is the manufacture method providing described 500MPa level engineering structure 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 welding cold crack sensitivity FACTOR P cm≤0.20% in addition, 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 preferred further, 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 adopting mentioned component and weight percent thereof in the present invention is below described in detail in detail.
C affects very large on intensity, toughness, welding property.C generally serves as strengthening constituent element in steel, if dissolve in matrix to play 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 determines.
Si is deoxidation in steel making bioelement, also has certain solution strengthening effect, 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 determines.
Mn is also the bioelement of deoxidation in steel making, and Mn cost of alloy is cheap, it is the effective element improving intensity, in addition, Mn is the element expanding austenitic area, can reduce the transition temperature of supercooled austenite, control one of quite effective element in structure of steel, but Mn too high levels, 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 determines.
P can significantly improve the atmospheric corrosion resistance of steel, and by the segregation of P, improves the deficiency of soft steel intergranular intensity.But P is strong segregation element in steel, the low-temperature flexibility of steel also seriously can be reduced, totally unfavorable to 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 the toughness plasticity of steel, cold formability and weldability, and steel plate can also be caused to indulge lateral performance difference, and deteriorate significantly super-thick steel plate thickness directional properties.Therefore should reduce S content in steel as far as possible.S content of the present invention is not more than 0.005%.
Nb is strong carbonitride-forming elements, and the effective austenitic recrystallize of delayed deformation of energy, stops Austenite Grain Growth, improve austenite recrystallization temperature, crystal grain thinning, improve the obdurability of steel.By separating out carbonitride in roller repairing process, producing refined crystalline strengthening and precipitation strength and being used for the comprehensive mechanical performance of raising steel.Nb content 0.030%-0.060% of the present invention.
Ti is a kind of strong carbonitride-forming elements, and its carbonitride has higher fusing point, has inhibition to Austenite Grain Growth during heating.The grain growth of the remarkable tissue welding heat affected zone of TiN or TiC particle energy in steel, thus improve the mechanical property of its welding joint.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 the oxide inclusion of Al be caused to increase, and reduce the purity of steel, be unfavorable for toughness and the weather resistance of steel, AlN fusing point is higher, can stop Austenite Grain Growth during heating of plate blank.Als content 0.020%-0.050% of the present invention.
Cu can improve the hardening capacity of steel, in steel, mainly play solid solution and precipitation strength effect, can also pass through Cu-Cr-Ni suitable proportion simultaneously, improves the weather resistance of steel, is conducive in addition obtaining good low-temperature flexibility, increases the fatigue crack extended capability of steel.Cu content is less than 0.35%, and its precipitation strength effect is not obvious, can affect welding heat influence area toughness when being greater than 0.45%.Cu content 0.35%-0.45% of the present invention.
Cr improves hardening capacity element, can suppress polygonal ferrite and pearlitic formation, promotes bainite or martensitic transformation, thus the strong hardness of steel is increased, but Cr is too high will affect the toughness of steel, and causes temper brittleness.Cr content 0.20%-0.40% of the present invention.
Ni can improve hardening capacity, has certain strengthening effect, can also improve the low-temperature flexibility of steel significantly, and mother metal and Low Temperature Impact Toughness of Heat-affected Zone are increased 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 suppressing the decrepitation in 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 effectively can postpone the transformation of ferrite and pearlite, thus promote the acquisition of bainite, steel is made to obtain acicular structure more completely within the scope of wider speed of cooling, but too high Mo can make the low-temperature flexibility of steel significantly worsen, also form too much martensite when welding, causing welding joint fragility to increase.Mo is noble metal element simultaneously.Mo content 0.05%-0.10% of the present invention.
The manufacture method of 500MPa level engineering structure high performance ultra-thick steel plate 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, inspection inspection, warehouse-in; Adopt Clean Steel to smelt continuous casting process, utilize each metallurgical equipment function of hot metal pretreatment, top and bottom combined blown converter, LF/RH, tundish, whole process control S, H, N detrimental impurity content; Come into operation solidification end dynamic soft-reduction, strand retarded cooling process technical measures of continuous caster ensure strand macrostructure.
The manufacture method of 500MPa level engineering structure high performance ultra-thick steel plate 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;
Described LF/RH combines in refining procedure, the treatment time 10-15min of LF molten steel departures below [S]≤0.0050%, RH vacuum tightness 100Pa, RH departures molten steel [H]≤0.0002%, RH departures molten steel [S]≤0.0020%;
Continuous casting production adopts alkaline covering agent, and crystallizer adopts low-carbon microalloy covering slag, omnidistance employing ladle stamp, steel ladle protective sleeve, middle bag submerged nozzle molding casting, and control casting process increases N and is not more than 0.0003%;
Strand after continuous caster cutting enters burial pit slow cooling, and strand enters to cheat temperature 500-900 DEG C, and slow cooling time 48h-72h, goes out to cheat temperature 200-300 DEG C;
Steel rolling process: adopt online TMCP Technology, without the need to thermal treatment after rolling;
For ensureing the abundant solid solution of alloying element, prevent austenite crystal from too growing up, slab heating temperature controls at 1200-1250 DEG C;
Adopt two-phase control rolling, roughing start rolling temperature scope 1050-1150 DEG C, completes first stage rolling in austenite recrystallization temperature scope, accumulative draught 60-65%; Subordinate phase finish rolling rolling in austenite non-recrystallization temperature range, finish rolling start rolling temperature 850-920 DEG C, finishing temperature 800-830 DEG C;
In described refrigerating work procedure, adopt the quick water-cooled of MULPIC, speed of cooling 5-15 DEG C/S, final cooling temperature 200-350 DEG C.
As preferably, in steel making working procedure, strand enters to cheat temperature 700-800 DEG C, and slow cooling time 60h-72h, goes out to cheat temperature 230-300 DEG C.
MULPIC cooling by water speed 7-10 DEG C/S, final cooling temperature 250-350 DEG C in steel rolling process.
Beneficial effect of the present invention is:
1. the present invention adopts low C, Cu-Ni-Cr-Mo-Nb-Ti component system, the interpolation of Nb-Ti compound has stronger Grain refinement than independent V, prevents welded heat affecting zone (HAZ) grain growth, improve steel matrix and HAZ obdurability, also contribute to improving 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 excellent (I >=6.0), thickness directional properties high (relative reduction in area Ψ z reaches Z35 level) ,-40 DEG C of longitudinal summers of steel plate 1/2 thickness reach more than 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 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, the detrimental impurity content such as whole process control S, H, N.In a word, cleanliness factor and the strand macrostructure of steel is ensured by technology measures such as Cleanliness of Molten Steel control, the dynamic soft reduction of continuous casting machine that comes into operation, strand slow cooling, [S]≤0.0020%, [N]≤0.0030%, [H]≤0.0002%, center segregation C≤1.5.
3, slab heating temperature of the present invention controls between 1200-1250 DEG C, and adopt two-phase control rolling, roughing start rolling temperature scope 1050-1150 DEG C, completes first stage rolling in austenite recrystallization temperature scope, accumulative pressure 60-65%; Finish rolling start rolling temperature 850-920 DEG C, finishing temperature 800-830 DEG C.Adopt the quick water-cooled of MULPIC, speed of cooling 5-15 DEG C/S, final cooling temperature 200-350 DEG C.Aforementioned strand, through this heating, roughing, finish rolling, process for cooling, obtains that crystal grain is tiny, the acicular ferrite structure of homogeneous microstructure, thus realizes the performance index of design.
4, the present invention adopts online TMCP technique, and without the need to 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 high-performance steel super-thick steel plate, design and manufactured that a kind of 500MPa level is easily welded, high tenacity, low yield strength ratio, thickness directional properties are excellent, 1/2 thickness good combination property, there is the super-thick steel plate of atmospheric corrosion resistance, possessing outstanding substantive distinguishing features and significant progressive.
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.
The present invention is implemented at 210 tons of BOF steelmaking shop and 4300mm Wide and Thick Slab factory.
The present invention adopts low C, Cu-Ni-Cr-Mo-Nb-Ti component 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.Concrete enforcement composition 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, inspection → 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 below [S]≤0.005%, RH vacuum tightness 100Pa treatment time >=10min, RH set off molten steel [H]≤0.0002%, RH departures molten steel [S]≤0.0020%.Continuous casting production adopts alkaline covering agent, and crystallizer adopts low-carbon microalloy covering slag, omnidistance employing ladle stamp, steel ladle protective sleeve, middle bag submerged nozzle molding casting, and control casting process increases N and is not more than 0.0003%.Come into operation dynamic soft-reduction, and strand enters burial pit slow cooling, and strand enters to cheat temperature 500-900 DEG C, and slow cooling time 48-72h, goes out to cheat temperature 200-300 DEG C.Concrete enforcement process for making parameter is in table 3.
Table 3 process for making parameter
Steel rolling process: slab heating temperature controls between 1200-1250 DEG C.Adopt two-phase control rolling, roughing start rolling temperature scope 1050-1150 DEG C, completes first stage rolling in austenite recrystallization temperature scope, accumulative draught 60-65%; Finish rolling start rolling temperature 850-920 DEG C, finishing temperature 800-830 DEG C.Adopt the quick water-cooled of MULPIC, speed of cooling 5-15 DEG C/S, final cooling temperature 200-350 DEG C.Concrete enforcement process for making parameter is in table 4.
Table 4 steel rolling process parameter
Concrete enforcement steel plate assay in kind is in table 5.
Table 5 steel plate assay in kind
。
Claims (5)
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 0.030%-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, meet welding cold crack sensitivity FACTOR P cm≤0.20% in addition, ASTM G101-01 corrosion resistance index I > 6.0; Described steel plate thickness is 60mm-100mm.
2. the manufacture method of 500MPa level engineering structure high performance ultra-thick steel plate 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, inspection inspection, warehouse-in; Adopt Clean Steel to smelt continuous casting process, utilize each metallurgical equipment function of hot metal pretreatment, top and bottom combined blown converter, LF/RH, tundish, whole process control S, H, N detrimental impurity content; Come into operation solidification end dynamic soft-reduction, strand retarded cooling process technical measures of continuous caster ensure strand macrostructure.
3. the manufacture method of 500MPa level engineering structure high performance ultra-thick steel plate according to claim 2, concrete steps are as follows:
Steel making working procedure:
Molten iron adopts desulfurization pre-treatment, top and bottom combined blown converter smelting;
Described LF/RH combines in refining procedure, the treatment time 10-15min of LF molten steel departures below [S]≤0.0050%, RH vacuum tightness 100Pa, RH departures molten steel [H]≤0.0002%, RH departures molten steel [S]≤0.0020%;
Continuous casting production adopts alkaline covering agent, and crystallizer adopts low-carbon microalloy covering slag, omnidistance employing ladle stamp, steel ladle protective sleeve, middle bag submerged nozzle molding casting, and control casting process increases N and is not more than 0.0003%;
Strand after continuous caster cutting enters burial pit slow cooling, and strand enters to cheat temperature 500-900 DEG C, and slow cooling time 48h-72h, goes out to cheat temperature 200-300 DEG C;
Steel rolling process: adopt online TMCP Technology, without the need to thermal treatment after rolling;
For ensureing the abundant solid solution of alloying element, prevent austenite crystal from too growing up, slab heating temperature controls at 1200-1250 DEG C;
Adopt two-phase control rolling, roughing start rolling temperature scope 1050-1150 DEG C, completes first stage rolling in austenite recrystallization temperature scope, accumulative draught 60-65%; Subordinate phase finish rolling rolling in austenite non-recrystallization temperature range, finish rolling start rolling temperature 850-920 DEG C, finishing temperature 800-830 DEG C;
In described refrigerating work procedure, adopt the quick water-cooled of MULPIC, speed of cooling 5-15 DEG C/S, final cooling temperature 200-350 DEG C.
4. the manufacture method of 500MPa level engineering structure high performance ultra-thick steel plate according to claim 2, it is characterized in that, in steel making working procedure, strand enters to cheat temperature 700-800 DEG C, and slow cooling time 60h-72h, goes out to cheat temperature 230-300 DEG C.
5. the manufacture method of 500MPa level engineering structure high performance ultra-thick steel plate according to claim 2, is characterized in that, MULPIC cooling by water speed 7-10 DEG C/S, final cooling temperature 250-350 DEG C in steel rolling process.
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| CN102011068A (en) * | 2010-12-13 | 2011-04-13 | 首钢总公司 | 800 MPa-grade low-yield-ratio structural steel plate and production method thereof |
| CN102828108A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | Low-cost high-strength steel plate for shipbuilding and manufacturing method thereof |
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